int udev_node_update_old_links(sd_device *dev, sd_device *dev_old) {
const char *name, *devpath;
int r;
assert(dev);
assert(dev_old);
r = sd_device_get_devpath(dev, &devpath);
if (r < 0)
return log_device_debug_errno(dev, r, "Failed to get devpath: %m");
/* update possible left-over symlinks */
FOREACH_DEVICE_DEVLINK(dev_old, name) {
const char *name_current;
bool found = false;
/* check if old link name still belongs to this device */
FOREACH_DEVICE_DEVLINK(dev, name_current)
if (streq(name, name_current)) {
found = true;
break;
}
if (found)
continue;
log_device_debug(dev, "Updating old name, '%s' no longer belonging to '%s'",
name, devpath);
link_update(dev, name, false);
}
return 0;
}
static int builtin_net_setup_link(sd_device *dev, int argc, char **argv, bool test) {
_cleanup_free_ char *driver = NULL;
const char *name = NULL;
link_config *link;
int r;
if (argc > 1)
return log_device_error_errno(dev, EINVAL, "This program takes no arguments.");
r = link_get_driver(ctx, dev, &driver);
if (r >= 0)
udev_builtin_add_property(dev, test, "ID_NET_DRIVER", driver);
r = link_config_get(ctx, dev, &link);
if (r < 0) {
if (r == -ENOENT)
return log_device_debug_errno(dev, r, "No matching link configuration found.");
return log_device_error_errno(dev, r, "Failed to get link config: %m");
}
r = link_config_apply(ctx, link, dev, &name);
if (r < 0)
log_device_warning_errno(dev, r, "Could not apply link config, ignoring: %m");
udev_builtin_add_property(dev, test, "ID_NET_LINK_FILE", link->filename);
if (name)
udev_builtin_add_property(dev, test, "ID_NET_NAME", name);
return 0;
}
static int builtin_btrfs(sd_device *dev, int argc, char *argv[], bool test) {
struct btrfs_ioctl_vol_args args = {};
_cleanup_close_ int fd = -1;
int r;
if (argc != 3 || !streq(argv[1], "ready"))
return log_device_error_errno(dev, EINVAL, "Invalid arguments");
fd = open("/dev/btrfs-control", O_RDWR|O_CLOEXEC);
if (fd < 0)
return log_device_debug_errno(dev, errno, "Failed to open /dev/btrfs-control: %m");
strscpy(args.name, sizeof(args.name), argv[2]);
r = ioctl(fd, BTRFS_IOC_DEVICES_READY, &args);
if (r < 0)
return log_device_debug_errno(dev, errno, "Failed to call BTRFS_IOC_DEVICES_READY: %m");
udev_builtin_add_property(dev, test, "ID_BTRFS_READY", one_zero(r == 0));
return 0;
}
/* 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;
}
static int node_symlink(sd_device *dev, const char *node, const char *slink) {
_cleanup_free_ char *slink_dirname = NULL, *target = NULL;
const char *id_filename, *slink_tmp;
struct stat stats;
int r;
assert(dev);
assert(node);
assert(slink);
slink_dirname = dirname_malloc(slink);
if (!slink_dirname)
return log_oom();
/* use relative link */
r = path_make_relative(slink_dirname, node, &target);
if (r < 0)
return log_device_error_errno(dev, r, "Failed to get relative path from '%s' to '%s': %m", slink, node);
/* preserve link with correct target, do not replace node of other device */
if (lstat(slink, &stats) == 0) {
if (S_ISBLK(stats.st_mode) || S_ISCHR(stats.st_mode)) {
log_device_error(dev, "Conflicting device node '%s' found, link to '%s' will not be created.", slink, node);
return -EOPNOTSUPP;
} else if (S_ISLNK(stats.st_mode)) {
_cleanup_free_ char *buf = NULL;
if (readlink_malloc(slink, &buf) >= 0 &&
streq(target, buf)) {
log_device_debug(dev, "Preserve already existing symlink '%s' to '%s'", slink, target);
(void) label_fix(slink, LABEL_IGNORE_ENOENT);
(void) utimensat(AT_FDCWD, slink, NULL, AT_SYMLINK_NOFOLLOW);
return 0;
}
}
} else {
log_device_debug(dev, "Creating symlink '%s' to '%s'", slink, target);
do {
r = mkdir_parents_label(slink, 0755);
if (!IN_SET(r, 0, -ENOENT))
break;
mac_selinux_create_file_prepare(slink, S_IFLNK);
if (symlink(target, slink) < 0)
r = -errno;
mac_selinux_create_file_clear();
} while (r == -ENOENT);
if (r == 0)
return 0;
if (r < 0)
log_device_debug_errno(dev, r, "Failed to create symlink '%s' to '%s', trying to replace '%s': %m", slink, target, slink);
}
log_device_debug(dev, "Atomically replace '%s'", slink);
r = device_get_id_filename(dev, &id_filename);
if (r < 0)
return log_device_error_errno(dev, r, "Failed to get id_filename: %m");
slink_tmp = strjoina(slink, ".tmp-", id_filename);
(void) unlink(slink_tmp);
do {
r = mkdir_parents_label(slink_tmp, 0755);
if (!IN_SET(r, 0, -ENOENT))
break;
mac_selinux_create_file_prepare(slink_tmp, S_IFLNK);
if (symlink(target, slink_tmp) < 0)
r = -errno;
mac_selinux_create_file_clear();
} while (r == -ENOENT);
if (r < 0)
return log_device_error_errno(dev, r, "Failed to create symlink '%s' to '%s': %m", slink_tmp, target);
if (rename(slink_tmp, slink) < 0) {
r = log_device_error_errno(dev, errno, "Failed to rename '%s' to '%s' failed: %m", slink_tmp, slink);
(void) unlink(slink_tmp);
}
return r;
}
static int node_permissions_apply(sd_device *dev, bool apply,
mode_t mode, uid_t uid, gid_t gid,
Hashmap *seclabel_list) {
const char *devnode, *subsystem, *id_filename = NULL;
struct stat stats;
dev_t devnum;
int r = 0;
assert(dev);
r = sd_device_get_devname(dev, &devnode);
if (r < 0)
return log_device_debug_errno(dev, r, "Failed to get devname: %m");
r = sd_device_get_subsystem(dev, &subsystem);
if (r < 0)
return log_device_debug_errno(dev, r, "Failed to get subsystem: %m");
r = sd_device_get_devnum(dev, &devnum);
if (r < 0)
return log_device_debug_errno(dev, r, "Failed to get devnum: %m");
(void) device_get_id_filename(dev, &id_filename);
if (streq(subsystem, "block"))
mode |= S_IFBLK;
else
mode |= S_IFCHR;
if (lstat(devnode, &stats) < 0)
return log_device_debug_errno(dev, errno, "cannot stat() node '%s' (%m)", devnode);
if (((stats.st_mode & S_IFMT) != (mode & S_IFMT)) || (stats.st_rdev != devnum))
return log_device_debug_errno(dev, EEXIST, "Found node '%s' with non-matching devnum %s, skip handling",
devnode, id_filename);
if (apply) {
bool selinux = false, smack = false;
const char *name, *label;
Iterator i;
if ((stats.st_mode & 0777) != (mode & 0777) || stats.st_uid != uid || stats.st_gid != gid) {
log_device_debug(dev, "Setting permissions %s, %#o, uid=%u, gid=%u", devnode, mode, uid, gid);
if (chmod(devnode, mode) < 0)
r = log_device_warning_errno(dev, errno, "Failed to set mode of %s to %#o: %m", devnode, mode);
if (chown(devnode, uid, gid) < 0)
r = log_device_warning_errno(dev, errno, "Failed to set owner of %s to uid=%u, gid=%u: %m", devnode, uid, gid);
} else
log_device_debug(dev, "Preserve permissions of %s, %#o, uid=%u, gid=%u", devnode, mode, uid, gid);
/* apply SECLABEL{$module}=$label */
HASHMAP_FOREACH_KEY(label, name, seclabel_list, i) {
int q;
if (streq(name, "selinux")) {
selinux = true;
q = mac_selinux_apply(devnode, label);
if (q < 0)
log_device_error_errno(dev, q, "SECLABEL: failed to set SELinux label '%s': %m", label);
else
log_device_debug(dev, "SECLABEL: set SELinux label '%s'", label);
} else if (streq(name, "smack")) {
smack = true;
q = mac_smack_apply(devnode, SMACK_ATTR_ACCESS, label);
if (q < 0)
log_device_error_errno(dev, q, "SECLABEL: failed to set SMACK label '%s': %m", label);
else
log_device_debug(dev, "SECLABEL: set SMACK label '%s'", label);
} else
log_device_error(dev, "SECLABEL: unknown subsystem, ignoring '%s'='%s'", name, label);
}
/* set the defaults */
if (!selinux)
(void) mac_selinux_fix(devnode, LABEL_IGNORE_ENOENT);
if (!smack)
(void) mac_smack_apply(devnode, SMACK_ATTR_ACCESS, NULL);
}
static int device_amend(sd_device *device, const char *key, const char *value) {
int r;
assert(device);
assert(key);
assert(value);
if (streq(key, "DEVPATH")) {
char *path;
path = strjoina("/sys", value);
/* the caller must verify or trust this data (e.g., if it comes from the kernel) */
r = device_set_syspath(device, path, false);
if (r < 0)
return log_device_debug_errno(device, r, "sd-device: Failed to set syspath to '%s': %m", path);
} else if (streq(key, "SUBSYSTEM")) {
r = device_set_subsystem(device, value);
if (r < 0)
return log_device_debug_errno(device, r, "sd-device: Failed to set subsystem to '%s': %m", value);
} else if (streq(key, "DEVTYPE")) {
r = device_set_devtype(device, value);
if (r < 0)
return log_device_debug_errno(device, r, "sd-device: Failed to set devtype to '%s': %m", value);
} else if (streq(key, "DEVNAME")) {
r = device_set_devname(device, value);
if (r < 0)
return log_device_debug_errno(device, r, "sd-device: Failed to set devname to '%s': %m", value);
} else if (streq(key, "USEC_INITIALIZED")) {
usec_t t;
r = safe_atou64(value, &t);
if (r < 0)
return log_device_debug_errno(device, r, "sd-device: Failed to parse timestamp '%s': %m", value);
r = device_set_usec_initialized(device, t);
if (r < 0)
return log_device_debug_errno(device, r, "sd-device: Failed to set usec-initialized to '%s': %m", value);
} else if (streq(key, "DRIVER")) {
r = device_set_driver(device, value);
if (r < 0)
return log_device_debug_errno(device, r, "sd-device: Failed to set driver to '%s': %m", value);
} else if (streq(key, "IFINDEX")) {
r = device_set_ifindex(device, value);
if (r < 0)
return log_device_debug_errno(device, r, "sd-device: Failed to set ifindex to '%s': %m", value);
} else if (streq(key, "DEVMODE")) {
r = device_set_devmode(device, value);
if (r < 0)
return log_device_debug_errno(device, r, "sd-device: Failed to set devmode to '%s': %m", value);
} else if (streq(key, "DEVUID")) {
r = device_set_devuid(device, value);
if (r < 0)
return log_device_debug_errno(device, r, "sd-device: Failed to set devuid to '%s': %m", value);
} else if (streq(key, "DEVGID")) {
r = device_set_devgid(device, value);
if (r < 0)
return log_device_debug_errno(device, r, "sd-device: Failed to set devgid to '%s': %m", value);
} else if (streq(key, "DEVLINKS")) {
const char *word, *state;
size_t l;
FOREACH_WORD(word, l, value, state) {
char devlink[l + 1];
strncpy(devlink, word, l);
devlink[l] = '\0';
r = device_add_devlink(device, devlink);
if (r < 0)
return log_device_debug_errno(device, r, "sd-device: Failed to add devlink '%s': %m", devlink);
}
} else if (streq(key, "TAGS")) {
