/*
- * udev_db.c
- *
* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
*
*
* 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.,
- * 675 Mass Ave, Cambridge, MA 02139, USA.
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <string.h>
#include <errno.h>
#include <dirent.h>
+#include <sys/stat.h>
+#include <sys/types.h>
-#include "libsysfs/sysfs/libsysfs.h"
-#include "udev_libc_wrapper.h"
#include "udev.h"
-#include "udev_utils.h"
-#include "logging.h"
-#include "udev_db.h"
+#include "udev_selinux.h"
-#define PATH_TO_NAME_CHAR '@'
-static int get_db_filename(const char *devpath, char *filename, int len)
+static size_t devpath_to_db_path(const char *devpath, char *filename, size_t len)
{
- char temp[PATH_SIZE];
- char *pos;
-
- /* replace '/' to transform path into a filename */
- strlcpy(temp, devpath, sizeof(temp));
- pos = strchr(&temp[1], '/');
- while (pos) {
- pos[0] = PATH_TO_NAME_CHAR;
- pos = strchr(&pos[1], '/');
- }
- snprintf(filename, len, "%s%s", udev_db_path, temp);
- filename[len-1] = '\0';
+ 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];
- struct name_entry *name_loop;
- FILE *f;
if (udev->test_run)
return 0;
- /* don't write anything if udev created only the node with the
- * kernel name without any interesting data to remember
+ 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 (strcmp(udev->name, udev->kernel_name) == 0 &&
- list_empty(&udev->symlink_list) && list_empty(&udev->env_list) &&
+ if (list_empty(&udev->symlink_list) && list_empty(&udev->env_list) &&
!udev->partitions && !udev->ignore_remove) {
- dbg("nothing interesting to store in udevdb, skip");
- goto exit;
- }
+ 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);
- get_db_filename(udev->devpath, filename, sizeof(filename));
- create_path(filename);
- f = fopen(filename, "w");
- if (f == NULL) {
- err("unable to create db file '%s'", filename);
- return -1;
+ 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);
}
- dbg("storing data for device '%s' in '%s'", udev->devpath, filename);
- fprintf(f, "P:%s\n", udev->devpath);
- 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);
- fprintf(f, "M:%u:%u\n", major(udev->devt), minor(udev->devt));
- if (udev->partitions)
- 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);
-
-exit:
+ /* add name to index */
+ name_index(udev->dev->devpath, udev->name, 1);
+
return 0;
}
-static int parse_db_file(struct udevice *udev, const char *filename)
+int udev_db_get_device(struct udevice *udev, const char *devpath)
{
+ struct stat stats;
+ char filename[PATH_SIZE];
char line[PATH_SIZE];
- unsigned int major, minor;
+ 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) {
- err("unable to read db file '%s'", filename);
+ info("error reading db file %s: %s\n", filename, strerror(errno));
return -1;
}
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 'P':
- if (count > sizeof(udev->devpath))
- count = sizeof(udev->devpath);
- memcpy(udev->devpath, &bufline[2], count-2);
- udev->devpath[count-2] = '\0';
- break;
case 'N':
- if (count > sizeof(udev->name))
- count = sizeof(udev->name);
- memcpy(udev->name, &bufline[2], count-2);
- udev->name[count-2] = '\0';
+ strlcpy(udev->name, line, sizeof(udev->name));
break;
case 'M':
- if (count > sizeof(line))
- count = sizeof(line);
- memcpy(line, &bufline[2], count-2);
- line[count-2] = '\0';
- sscanf(line, "%u:%u", &major, &minor);
- udev->devt = makedev(major, minor);
+ sscanf(line, "%u:%u", &maj, &min);
+ udev->devt = makedev(maj, min);
break;
case 'S':
- if (count > sizeof(line))
- count = sizeof(line);
- memcpy(line, &bufline[2], count-2);
- line[count-2] = '\0';
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':
- if (count > sizeof(line))
- count = sizeof(line);
- memcpy(line, &bufline[2], count-2);
- line[count-2] = '\0';
udev->partitions = atoi(line);
break;
case 'R':
- if (count > sizeof(line))
- count = sizeof(line);
- memcpy(line, &bufline[2], count-2);
- line[count-2] = '\0';
udev->ignore_remove = atoi(line);
break;
case 'E':
- if (count > sizeof(line))
- count = sizeof(line);
- memcpy(line, &bufline[2], count-2);
- line[count-2] = '\0';
name_list_add(&udev->env_list, line, 0);
break;
}
int udev_db_delete_device(struct udevice *udev)
{
char filename[PATH_SIZE];
+ struct name_entry *name_loop;
- get_db_filename(udev->devpath, filename, sizeof(filename));
- unlink(filename);
-
- return 0;
-}
-
-int udev_db_get_device(struct udevice *udev, const char *devpath)
-{
- char filename[PATH_SIZE];
+ if (udev->test_run)
+ return 0;
- get_db_filename(devpath, filename, sizeof(filename));
+ devpath_to_db_path(udev->dev->devpath, filename, sizeof(filename));
+ unlink(filename);
- if (parse_db_file(udev, filename) != 0)
- return -1;
+ 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_search_name(char *devpath, size_t len, const char *name)
+int udev_db_get_all_entries(struct list_head *name_list)
{
+ char dbpath[PATH_MAX];
DIR *dir;
- dir = opendir(udev_db_path);
+ strlcpy(dbpath, udev_root, sizeof(dbpath));
+ strlcat(dbpath, "/"DB_DIR, sizeof(dbpath));
+ dir = opendir(dbpath);
if (dir == NULL) {
- err("unable to open udev_db '%s'", udev_db_path);
+ info("no udev_db available '%s': %s\n", dbpath, strerror(errno));
return -1;
}
while (1) {
struct dirent *ent;
- char filename[PATH_SIZE];
- char path[PATH_SIZE];
- char nodename[PATH_SIZE];
- char *bufline;
- char *buf;
- size_t bufsize;
- size_t cur;
- size_t count;
+ char device[PATH_SIZE];
ent = readdir(dir);
if (ent == NULL || ent->d_name[0] == '\0')
break;
-
if (ent->d_name[0] == '.')
continue;
- snprintf(filename, sizeof(filename), "%s/%s", udev_db_path, ent->d_name);
- filename[sizeof(filename)-1] = '\0';
- dbg("looking at '%s'", filename);
-
- if (file_map(filename, &buf, &bufsize) != 0) {
- err("unable to read db file '%s'", filename);
- continue;
- }
-
- cur = 0;
- while (cur < bufsize) {
- count = buf_get_line(buf, bufsize, cur);
- bufline = &buf[cur];
- cur += count+1;
-
- switch(bufline[0]) {
- case 'P':
- if (count > sizeof(path))
- count = sizeof(path);
- memcpy(path, &bufline[2], count-2);
- path[count-2] = '\0';
- break;
- case 'N':
- case 'S':
- if (count > sizeof(nodename))
- count = sizeof(nodename);
- memcpy(nodename, &bufline[2], count-2);
- nodename[count-2] = '\0';
- dbg("compare '%s' '%s'", nodename, name);
- if (strcmp(nodename, name) == 0) {
- memcpy(devpath, &bufline[2], count-2);
- devpath[count-2] = '\0';
- file_unmap(buf, bufsize);
- closedir(dir);
- return 0;
- }
- break;
- default:
- continue;
- }
- }
- file_unmap(buf, bufsize);
- }
-
- closedir(dir);
- return -1;
-}
-
-int udev_db_dump_names(int (*handler_function)(const char *path, const char *name))
-{
- DIR *dir;
-
- dir = opendir(udev_db_path);
- if (dir == NULL) {
- err("unable to open udev_db '%s'", udev_db_path);
- return -1;
- }
-
- while (1) {
- struct dirent *ent;
- char filename[PATH_SIZE];
- char path[PATH_SIZE];
- char nodename[PATH_SIZE];
- char *bufline;
- char *buf;
- size_t bufsize;
- size_t cur;
- size_t count;
-
- ent = readdir(dir);
- if (ent == NULL || ent->d_name[0] == '\0')
- break;
-
- if (ent->d_name[0] == '.')
- continue;
-
- snprintf(filename, sizeof(filename), "%s/%s", udev_db_path, ent->d_name);
- filename[sizeof(filename)-1] = '\0';
- dbg("looking at '%s'", filename);
-
- if (file_map(filename, &buf, &bufsize) != 0) {
- err("unable to read db file '%s'", filename);
- continue;
- }
-
- path[0] = '\0';
- nodename[0] = '\0';
- cur = 0;
- while (cur < bufsize) {
- count = buf_get_line(buf, bufsize, cur);
- bufline = &buf[cur];
- cur += count+1;
-
- switch(bufline[0]) {
- case 'P':
- if (count > sizeof(path))
- count = sizeof(path);
- memcpy(path, &bufline[2], count-2);
- path[count-2] = '\0';
- break;
- case 'N':
- if (count > sizeof(nodename))
- count = sizeof(nodename);
- memcpy(nodename, &bufline[2], count-2);
- nodename[count-2] = '\0';
- break;
- default:
- continue;
- }
- }
- file_unmap(buf, bufsize);
-
- if (path[0] == '\0' || nodename[0] == '\0')
- continue;
-
- if (handler_function(path, nodename) != 0)
- break;
+ strlcpy(device, ent->d_name, sizeof(device));
+ path_decode(device);
+ name_list_add(name_list, device, 1);
+ dbg("added '%s'\n", device);
}
closedir(dir);
~ianmdlvl / elogind.git / blobdiff