void udev_node_add(struct udev_device *dev, mode_t mode, uid_t uid, gid_t gid)
{
struct udev *udev = udev_device_get_udev(dev);
char filename[UTIL_PATH_SIZE];
struct udev_list_entry *list_entry;
int err = 0;
info(udev, "handling device node '%s', devnum=%s, mode=%#o, uid=%d, gid=%d\n",
udev_device_get_devnode(dev), udev_device_get_id_filename(dev), mode, uid, gid);
if (node_fixup(dev, mode, uid, gid) < 0)
return;
/* always add /dev/{block,char}/$major:$minor */
snprintf(filename, sizeof(filename), "%s/%s/%u:%u",
udev_get_dev_path(udev),
strcmp(udev_device_get_subsystem(dev), "block") == 0 ? "block" : "char",
major(udev_device_get_devnum(dev)), minor(udev_device_get_devnum(dev)));
node_symlink(udev, udev_device_get_devnode(dev), filename);
/* create/update symlinks, add symlinks to name index */
udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(dev)) {
if (udev_list_entry_get_num(list_entry))
/* simple unmanaged link name */
node_symlink(udev, udev_device_get_devnode(dev), udev_list_entry_get_name(list_entry));
else
link_update(dev, udev_list_entry_get_name(list_entry), 1);
}
}
/* manage "stack of names" with possibly specified device priorities */
static void link_update(struct udev_device *dev, const char *slink, bool add)
{
struct udev *udev = udev_device_get_udev(dev);
char name_enc[UTIL_PATH_SIZE];
char filename[UTIL_PATH_SIZE * 2];
char dirname[UTIL_PATH_SIZE];
const char *target;
char buf[UTIL_PATH_SIZE];
dbg(udev, "update symlink '%s' of '%s'\n", slink, udev_device_get_syspath(dev));
util_path_encode(&slink[strlen(udev_get_dev_path(udev))+1], name_enc, sizeof(name_enc));
util_strscpyl(dirname, sizeof(dirname), udev_get_run_path(udev), "/links/", name_enc, NULL);
util_strscpyl(filename, sizeof(filename), dirname, "/", udev_device_get_id_filename(dev), NULL);
if (!add) {
dbg(udev, "removing index: '%s'\n", filename);
if (unlink(filename) == 0)
rmdir(dirname);
}
target = link_find_prioritized(dev, add, dirname, buf, sizeof(buf));
if (target == NULL) {
info(udev, "no reference left, remove '%s'\n", slink);
if (unlink(slink) == 0)
util_delete_path(udev, slink);
} else {
info(udev, "creating link '%s' to '%s'\n", slink, target);
node_symlink(udev, target, slink);
}
if (add) {
int err;
dbg(udev, "creating index: '%s'\n", filename);
do {
int fd;
err = util_create_path(udev, filename);
if (err != 0 && err != -ENOENT)
break;
fd = open(filename, O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444);
if (fd >= 0)
close(fd);
else
err = -errno;
} while (err == -ENOENT);
}
}
/* manage "stack of names" with possibly specified device priorities */
static void link_update(struct udev_device *dev, const char *slink, bool add)
{
struct udev *udev = udev_device_get_udev(dev);
char name_enc[UTIL_PATH_SIZE];
char filename[UTIL_PATH_SIZE * 2];
char dirname[UTIL_PATH_SIZE];
const char *target;
char buf[UTIL_PATH_SIZE];
dbg(udev, "update symlink '%s' of '%s'\n", slink, udev_device_get_syspath(dev));
util_path_encode(&slink[strlen(udev_get_dev_path(udev))+1], name_enc, sizeof(name_enc));
snprintf(dirname, sizeof(dirname), "%s/.udev/links/%s", udev_get_dev_path(udev), name_enc);
snprintf(filename, sizeof(filename), "%s/%c%u:%u", dirname,
strcmp(udev_device_get_subsystem(dev), "block") == 0 ? 'b' : 'c',
major(udev_device_get_devnum(dev)), minor(udev_device_get_devnum(dev)));
if (!add) {
dbg(udev, "removing index: '%s'\n", filename);
unlink(filename);
util_delete_path(udev, filename);
}
target = link_find_prioritized(dev, add, dirname, buf, sizeof(buf));
if (target == NULL) {
info(udev, "no reference left, remove '%s'\n", slink);
unlink(slink);
util_delete_path(udev, slink);
} else {
info(udev, "creating link '%s' to '%s'\n", slink, target);
node_symlink(udev, target, slink);
}
if (add) {
int err;
dbg(udev, "creating index: '%s'\n", filename);
do {
err = util_create_path(udev, filename);
if (err != 0 && err != -ENOENT)
break;
err = symlink(udev_device_get_devpath(dev), filename);
if (err != 0)
err = -errno;
} while (err == -ENOENT);
}
}
/* manage "stack of names" with possibly specified device priorities */
static int link_update(sd_device *dev, const char *slink, bool add) {
_cleanup_free_ char *target = NULL, *filename = NULL, *dirname = NULL;
char name_enc[PATH_MAX];
const char *id_filename;
int r;
assert(dev);
assert(slink);
r = device_get_id_filename(dev, &id_filename);
if (r < 0)
return log_device_debug_errno(dev, r, "Failed to get id_filename: %m");
util_path_encode(slink + STRLEN("/dev"), name_enc, sizeof(name_enc));
dirname = path_join("/run/udev/links/", name_enc);
if (!dirname)
return log_oom();
filename = path_join(dirname, id_filename);
if (!filename)
return log_oom();
if (!add && unlink(filename) == 0)
(void) rmdir(dirname);
r = link_find_prioritized(dev, add, dirname, &target);
if (r < 0) {
log_device_debug(dev, "No reference left, removing '%s'", slink);
if (unlink(slink) == 0)
(void) rmdir_parents(slink, "/");
} else
(void) node_symlink(dev, target, slink);
if (add)
do {
_cleanup_close_ int fd = -1;
r = mkdir_parents(filename, 0755);
if (!IN_SET(r, 0, -ENOENT))
break;
fd = open(filename, O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444);
if (fd < 0)
r = -errno;
} while (r == -ENOENT);
return r;
}
int udev_node_add(struct udev_device *dev, mode_t mode, uid_t uid, gid_t gid)
{
struct udev *udev = udev_device_get_udev(dev);
int i;
int num;
struct udev_list_entry *list_entry;
int err = 0;
info(udev, "creating device node '%s', devnum=%d:%d, mode=%#o, uid=%d, gid=%d\n",
udev_device_get_devnode(dev),
major(udev_device_get_devnum(dev)), minor(udev_device_get_devnum(dev)),
mode, uid, gid);
if (udev_node_mknod(dev, NULL, makedev(0,0), mode, uid, gid) != 0) {
err = -1;
goto exit;
}
/* create all_partitions if requested */
num = udev_device_get_num_fake_partitions(dev);
if (num > 0) {
info(udev, "creating device partition nodes '%s[1-%i]'\n", udev_device_get_devnode(dev), num);
for (i = 1; i <= num; i++) {
char partitionname[UTIL_PATH_SIZE];
dev_t part_devnum;
snprintf(partitionname, sizeof(partitionname), "%s%d",
udev_device_get_devnode(dev), i);
partitionname[sizeof(partitionname)-1] = '\0';
part_devnum = makedev(major(udev_device_get_devnum(dev)),
minor(udev_device_get_devnum(dev)) + i);
udev_node_mknod(dev, partitionname, part_devnum, mode, uid, gid);
}
}
/* create/update symlinks, add symlinks to name index */
udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(dev)) {
if (udev_list_entry_get_flag(list_entry))
/* simple unmanaged link name */
node_symlink(udev, udev_device_get_devnode(dev), udev_list_entry_get_name(list_entry));
else
link_update(dev, udev_list_entry_get_name(list_entry), 1);
}
exit:
return err;
}
/* manage "stack of names" with possibly specified device priorities */
static void link_update(struct udev_device *dev, const char *slink, bool add)
{
struct udev *udev = udev_device_get_udev(dev);
char name_enc[UTIL_PATH_SIZE];
char filename[UTIL_PATH_SIZE * 2];
char dirname[UTIL_PATH_SIZE];
const char *target;
char buf[UTIL_PATH_SIZE];
util_path_encode(slink + strlen("/dev"), name_enc, sizeof(name_enc));
strscpyl(dirname, sizeof(dirname), "/run/udev/links/", name_enc, NULL);
strscpyl(filename, sizeof(filename), dirname, "/", udev_device_get_id_filename(dev), NULL);
if (!add && unlink(filename) == 0)
rmdir(dirname);
target = link_find_prioritized(dev, add, dirname, buf, sizeof(buf));
if (target == NULL) {
log_debug("no reference left, remove '%s'", slink);
if (unlink(slink) == 0)
util_delete_path(udev, slink);
} else {
log_debug("creating link '%s' to '%s'", slink, target);
node_symlink(dev, target, slink);
}
if (add) {
int err;
do {
int fd;
err = mkdir_parents(filename, 0755);
if (err != 0 && err != -ENOENT)
break;
fd = open(filename, O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444);
if (fd >= 0)
close(fd);
else
err = -errno;
} while (err == -ENOENT);
}
}
void udev_node_add(struct udev_device *dev, bool apply, mode_t mode, uid_t uid, gid_t gid)
{
char filename[UTIL_PATH_SIZE];
struct udev_list_entry *list_entry;
log_debug("handling device node '%s', devnum=%s, mode=%#o, uid=%d, gid=%d\n",
udev_device_get_devnode(dev), udev_device_get_id_filename(dev), mode, uid, gid);
if (node_permissions_apply(dev, apply, mode, uid, gid) < 0)
return;
/* always add /dev/{block,char}/$major:$minor */
snprintf(filename, sizeof(filename), "/dev/%s/%u:%u",
streq(udev_device_get_subsystem(dev), "block") ? "block" : "char",
major(udev_device_get_devnum(dev)), minor(udev_device_get_devnum(dev)));
node_symlink(dev, udev_device_get_devnode(dev), filename);
/* create/update symlinks, add symlinks to name index */
udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(dev))
link_update(dev, udev_list_entry_get_name(list_entry), true);
}
void udev_node_add(struct udev_device *dev, bool apply,
mode_t mode, uid_t uid, gid_t gid,
struct udev_list *seclabel_list) {
char filename[DEV_NUM_PATH_MAX];
struct udev_list_entry *list_entry;
log_debug("handling device node '%s', devnum=%s, mode=%#o, uid="UID_FMT", gid="GID_FMT,
udev_device_get_devnode(dev), udev_device_get_id_filename(dev), mode, uid, gid);
if (node_permissions_apply(dev, apply, mode, uid, gid, seclabel_list) < 0)
return;
/* always add /dev/{block,char}/$major:$minor */
xsprintf_dev_num_path(filename,
streq(udev_device_get_subsystem(dev), "block") ? "block" : "char",
udev_device_get_devnum(dev));
node_symlink(dev, udev_device_get_devnode(dev), filename);
/* create/update symlinks, add symlinks to name index */
udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(dev))
link_update(dev, udev_list_entry_get_name(list_entry), true);
}
static int update_link(struct udev_device *dev, const char *slink, int test)
{
struct udev *udev = udev_device_get_udev(dev);
struct udev_list_node dev_list;
struct udev_list_entry *dev_entry;
char target[UTIL_PATH_SIZE];
int count;
int priority = 0;
int rc = 0;
dbg(udev, "update symlink '%s' of '%s'\n", slink, udev_device_get_syspath(dev));
udev_list_init(&dev_list);
count = name_index_get_devices(udev, slink, &dev_list);
if (count > 1)
info(udev, "found %i devices with name '%s'\n", count, slink);
/* if we don't have a reference, delete it */
if (count <= 0) {
info(udev, "no reference left, remove '%s'\n", slink);
if (!test) {
unlink(slink);
util_delete_path(udev, slink);
}
goto out;
}
/* find the device with the highest priority */
target[0] = '\0';
udev_list_entry_foreach(dev_entry, udev_list_get_entry(&dev_list)) {
const char *syspath;
struct udev_device *dev_db;
const char *devnode;
syspath = udev_list_entry_get_name(dev_entry);
dbg(udev, "found '%s' for '%s'\n", syspath, slink);
/* did we find ourself? we win, if we have the same priority */
if (strcmp(udev_device_get_syspath(dev), syspath) == 0) {
dbg(udev, "compare (our own) priority of '%s' %i >= %i\n",
udev_device_get_devpath(dev), udev_device_get_devlink_priority(dev), priority);
if (strcmp(udev_device_get_devnode(dev), slink) == 0) {
info(udev, "'%s' is our device node, database inconsistent, skip link update\n",
udev_device_get_devnode(dev));
} else if (target[0] == '\0' || udev_device_get_devlink_priority(dev) >= priority) {
priority = udev_device_get_devlink_priority(dev);
util_strlcpy(target, udev_device_get_devnode(dev), sizeof(target));
}
continue;
}
/* another device, read priority from database */
dev_db = udev_device_new_from_syspath(udev, syspath);
if (dev_db == NULL)
continue;
devnode = udev_device_get_devnode(dev_db);
if (devnode != NULL) {
if (strcmp(devnode, slink) == 0) {
info(udev, "'%s' is a device node of '%s', skip link update\n",
devnode, syspath);
} else {
dbg(udev, "compare priority of '%s' %i > %i\n",
udev_device_get_devpath(dev_db),
udev_device_get_devlink_priority(dev_db),
priority);
if (target[0] == '\0' || udev_device_get_devlink_priority(dev_db) > priority) {
priority = udev_device_get_devlink_priority(dev_db);
util_strlcpy(target, devnode, sizeof(target));
}
}
}
udev_device_unref(dev_db);
}
udev_list_cleanup_entries(udev, &dev_list);
if (target[0] == '\0') {
info(udev, "no current target for '%s' found\n", slink);
rc = 1;
goto out;
}
/* create symlink to the target with the highest priority */
info(udev, "'%s' with target '%s' has the highest priority %i, create it\n", slink, target, priority);
if (!test) {
util_create_path(udev, slink);
node_symlink(udev, target, slink);
}
out:
return rc;
}
