/**
* udev_device_get_sysattr_list_entry:
* @udev_device: udev device
*
* Retrieve the list of available sysattrs, with value being empty;
* This just return all available sysfs attributes for a particular
* device without reading their values.
*
* Returns: the first entry of the property list
**/
_public_ struct udev_list_entry *udev_device_get_sysattr_list_entry(struct udev_device *udev_device)
{
assert_return_errno(udev_device, NULL, EINVAL);
if (!udev_device->sysattrs_read) {
const char *sysattr;
udev_list_cleanup(&udev_device->sysattrs);
FOREACH_DEVICE_SYSATTR(udev_device->device, sysattr)
udev_list_entry_add(&udev_device->sysattrs, sysattr, NULL);
udev_device->sysattrs_read = true;
}
return udev_list_get_entry(&udev_device->sysattrs);
}
/**
* udev_device_get_tags_list_entry:
* @udev_device: udev device
*
* Retrieve the list of tags attached to the udev device. The next
* list entry can be retrieved with udev_list_entry_get_next(),
* which returns #NULL if no more entries exist. The tag string
* can be retrieved from the list entry by udev_list_entry_get_name().
*
* Returns: the first entry of the tag list
**/
_public_ struct udev_list_entry *udev_device_get_tags_list_entry(struct udev_device *udev_device)
{
assert_return_errno(udev_device, NULL, EINVAL);
if (device_get_tags_generation(udev_device->device) != udev_device->tags_generation ||
!udev_device->tags_read) {
const char *tag;
udev_list_cleanup(&udev_device->tags);
FOREACH_DEVICE_TAG(udev_device->device, tag)
udev_list_entry_add(&udev_device->tags, tag, NULL);
udev_device->tags_read = true;
udev_device->tags_generation = device_get_tags_generation(udev_device->device);
}
return udev_list_get_entry(&udev_device->tags);
}
/**
* udev_device_get_event_properties_entry:
* @udev_device: udev device
*
* Retrieve the list of key/value device properties of the udev
* device. The next list entry can be retrieved with udev_list_entry_get_next(),
* which returns #NULL if no more entries exist. The property name
* can be retrieved from the list entry by udev_list_entry_get_name(),
* the property value by udev_list_entry_get_value().
*
* Returns: the first entry of the property list
**/
_public_ struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device)
{
assert_return_errno(udev_device, NULL, EINVAL);
if (device_get_properties_generation(udev_device->device) != udev_device->properties_generation ||
!udev_device->properties_read) {
const char *key, *value;
udev_list_cleanup(&udev_device->properties);
FOREACH_DEVICE_PROPERTY(udev_device->device, key, value)
udev_list_entry_add(&udev_device->properties, key, value);
udev_device->properties_read = true;
udev_device->properties_generation = device_get_properties_generation(udev_device->device);
}
return udev_list_get_entry(&udev_device->properties);
}
/**
* udev_device_get_devlinks_list_entry:
* @udev_device: udev device
*
* Retrieve the list of device links pointing to the device file of
* the udev device. The next list entry can be retrieved with
* udev_list_entry_get_next(), which returns #NULL if no more entries exist.
* The devlink path can be retrieved from the list entry by
* udev_list_entry_get_name(). The path is an absolute path, and starts with
* the device directory.
*
* Returns: the first entry of the device node link list
**/
_public_ struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device)
{
assert_return_errno(udev_device, NULL, EINVAL);
if (device_get_devlinks_generation(udev_device->device) != udev_device->devlinks_generation ||
!udev_device->devlinks_read) {
const char *devlink;
udev_list_cleanup(&udev_device->devlinks);
FOREACH_DEVICE_DEVLINK(udev_device->device, devlink)
udev_list_entry_add(&udev_device->devlinks, devlink, NULL);
udev_device->devlinks_read = true;
udev_device->devlinks_generation = device_get_devlinks_generation(udev_device->device);
}
return udev_list_get_entry(&udev_device->devlinks);
}
static int64_t trie_store_nodes(struct trie_f *trie, struct trie_node *node) {
uint64_t i;
struct trie_node_f n = {
.prefix_off = htole64(trie->strings_off + node->prefix_off),
.children_count = node->children_count,
.values_count = htole64(node->values_count),
};
struct trie_child_entry_f *children = NULL;
int64_t node_off;
if (node->children_count) {
children = new0(struct trie_child_entry_f, node->children_count);
if (!children)
return -ENOMEM;
}
/* post-order recursion */
for (i = 0; i < node->children_count; i++) {
int64_t child_off;
child_off = trie_store_nodes(trie, node->children[i].child);
if (child_off < 0) {
free(children);
return child_off;
}
children[i].c = node->children[i].c;
children[i].child_off = htole64(child_off);
}
/* write node */
node_off = ftello(trie->f);
if (fwrite(&n, sizeof(struct trie_node_f), 1, trie->f) != 1)
log_error("Failed to write sizeof struct trie_node_f to n in %s\n", "[udevadm-hwdb.c:trie_store_nodes]");
trie->nodes_count++;
/* append children array */
if (node->children_count) {
if (fwrite(children, sizeof(struct trie_child_entry_f), node->children_count, trie->f) != node->children_count)
log_error("Failed to write children_count in %s\n", "[udevadm-hwdb.c:trie_store_nodes]");
trie->children_count += node->children_count;
free(children);
}
/* append values array */
for (i = 0; i < node->values_count; i++) {
struct trie_value_entry_f v = {
.key_off = htole64(trie->strings_off + node->values[i].key_off),
.value_off = htole64(trie->strings_off + node->values[i].value_off),
};
if (fwrite(&v, sizeof(struct trie_value_entry_f), 1, trie->f) != 1)
log_error("Failed to write sizeof trie_value_entry_f to v in %s\n", "[udevadm-hwdb.c:trie_store_nodes]");
trie->values_count++;
}
return node_off;
}
static int trie_store(struct trie *trie, const char *filename) {
struct trie_f t = {
.trie = trie,
};
char *filename_tmp;
int64_t pos;
int64_t root_off;
int64_t size;
struct trie_header_f h = {
.signature = HWDB_SIG,
.tool_version = htole64(atoi(VERSION)),
.header_size = htole64(sizeof(struct trie_header_f)),
.node_size = htole64(sizeof(struct trie_node_f)),
.child_entry_size = htole64(sizeof(struct trie_child_entry_f)),
.value_entry_size = htole64(sizeof(struct trie_value_entry_f)),
};
int err;
/* calculate size of header, nodes, children entries, value entries */
t.strings_off = sizeof(struct trie_header_f);
trie_store_nodes_size(&t, trie->root);
err = fopen_temporary(filename , &t.f, &filename_tmp);
if (err < 0)
return err;
fchmod(fileno(t.f), 0444);
/* write nodes */
fseeko(t.f, sizeof(struct trie_header_f), SEEK_SET);
root_off = trie_store_nodes(&t, trie->root);
h.nodes_root_off = htole64(root_off);
pos = ftello(t.f);
h.nodes_len = htole64(pos - sizeof(struct trie_header_f));
/* write string buffer */
if (fwrite(trie->strings->buf, trie->strings->len, 1, t.f) != 1)
log_error("Failed to write into trie->strings->buf in %s\n", "[udevadm-hwdb.c:trie_store]");
h.strings_len = htole64(trie->strings->len);
/* write header */
size = ftello(t.f);
h.file_size = htole64(size);
fseeko(t.f, 0, SEEK_SET);
if (fwrite(&h, sizeof(struct trie_header_f), 1, t.f) != 1)
log_error("Failed to write into h in %s\n", "[udevadm-hwdb.c:trie_store]");
err = ferror(t.f);
if (err)
err = -errno;
fclose(t.f);
if (err < 0 || rename(filename_tmp, filename) < 0) {
unlink(filename_tmp);
goto out;
}
log_debug("=== trie on-disk ===\n");
log_debug("size: %8llu bytes\n", (unsigned long long)size);
log_debug("header: %8zu bytes\n", sizeof(struct trie_header_f));
log_debug("nodes: %8llu bytes (%8llu)\n",
(unsigned long long)t.nodes_count * sizeof(struct trie_node_f), (unsigned long long)t.nodes_count);
log_debug("child pointers: %8llu bytes (%8llu)\n",
(unsigned long long)t.children_count * sizeof(struct trie_child_entry_f), (unsigned long long)t.children_count);
log_debug("value pointers: %8llu bytes (%8llu)\n",
(unsigned long long)t.values_count * sizeof(struct trie_value_entry_f), (unsigned long long)t.values_count);
log_debug("string store: %8llu bytes\n", (unsigned long long)trie->strings->len);
log_debug("strings start: %8llu\n", (unsigned long long) t.strings_off);
out:
free(filename_tmp);
return err;
}
static int insert_data(struct trie *trie, struct udev_list *match_list,
char *line, const char *filename) {
char *value;
struct udev_list_entry *entry;
value = strchr(line, '=');
if (!value) {
log_error("Error, key/value pair expected but got '%s' in '%s':\n", line, filename);
return -EINVAL;
}
value[0] = '\0';
value++;
if (line[0] == '\0' || value[0] == '\0') {
log_error("Error, empty key or value '%s' in '%s':\n", line, filename);
return -EINVAL;
}
udev_list_entry_foreach(entry, udev_list_get_entry(match_list))
trie_insert(trie, trie->root, udev_list_entry_get_name(entry), line, value);
return 0;
}
static int import_file(struct udev *udev, struct trie *trie, const char *filename) {
enum {
HW_MATCH,
HW_DATA,
HW_NONE,
} state = HW_NONE;
FILE *f;
char line[LINE_MAX];
struct udev_list match_list;
udev_list_init(udev, &match_list, false);
f = fopen(filename, "re");
if (f == NULL)
return -errno;
while (fgets(line, sizeof(line), f)) {
size_t len;
char *pos;
/* comment line */
if (line[0] == '#')
continue;
/* strip trailing comment */
pos = strchr(line, '#');
if (pos)
pos[0] = '\0';
/* strip trailing whitespace */
len = strlen(line);
while (len > 0 && isspace(line[len-1]))
len--;
line[len] = '\0';
switch (state) {
case HW_NONE:
if (len == 0)
break;
if (line[0] == ' ') {
log_error("Error, MATCH expected but got '%s' in '%s':\n", line, filename);
break;
}
/* start of record, first match */
state = HW_MATCH;
udev_list_entry_add(&match_list, line, NULL);
break;
case HW_MATCH:
if (len == 0) {
log_error("Error, DATA expected but got empty line in '%s':\n", filename);
state = HW_NONE;
udev_list_cleanup(&match_list);
break;
}
/* another match */
if (line[0] != ' ') {
udev_list_entry_add(&match_list, line, NULL);
break;
}
/* first data */
state = HW_DATA;
insert_data(trie, &match_list, line, filename);
break;
case HW_DATA:
/* end of record */
if (len == 0) {
state = HW_NONE;
udev_list_cleanup(&match_list);
break;
}
if (line[0] != ' ') {
log_error("Error, DATA expected but got '%s' in '%s':\n", line, filename);
state = HW_NONE;
udev_list_cleanup(&match_list);
break;
}
insert_data(trie, &match_list, line, filename);
break;
};
}
fclose(f);
udev_list_cleanup(&match_list);
return 0;
}
static void help(void) {
printf("Usage: udevadm hwdb OPTIONS\n"
" --update update the hardware database\n"
" --test=<modalias> query database and print result\n"
" --root=<path> alternative root path in the filesystem\n"
" --help\n\n");
}
static int node_permissions_apply(struct udev_device *dev, bool apply,
mode_t mode, uid_t uid, gid_t gid,
struct udev_list *seclabel_list) {
const char *devnode = udev_device_get_devnode(dev);
dev_t devnum = udev_device_get_devnum(dev);
struct stat stats;
struct udev_list_entry *entry;
int err = 0;
if (streq(udev_device_get_subsystem(dev), "block"))
mode |= S_IFBLK;
else
mode |= S_IFCHR;
if (lstat(devnode, &stats) != 0) {
err = -errno;
log_debug_errno(errno, "can not stat() node '%s' (%m)", devnode);
goto out;
}
if (((stats.st_mode & S_IFMT) != (mode & S_IFMT)) || (stats.st_rdev != devnum)) {
err = -EEXIST;
log_debug("found node '%s' with non-matching devnum %s, skip handling",
udev_device_get_devnode(dev), udev_device_get_id_filename(dev));
goto out;
}
if (apply) {
bool selinux = false;
bool smack = false;
if ((stats.st_mode & 0777) != (mode & 0777) || stats.st_uid != uid || stats.st_gid != gid) {
log_debug("set permissions %s, %#o, uid=%u, gid=%u", devnode, mode, uid, gid);
err = chmod(devnode, mode);
if (err < 0)
log_warning_errno(errno, "setting mode of %s to %#o failed: %m", devnode, mode);
err = chown(devnode, uid, gid);
if (err < 0)
log_warning_errno(errno, "setting owner of %s to uid=%u, gid=%u failed: %m", devnode, uid, gid);
} else {
log_debug("preserve permissions %s, %#o, uid=%u, gid=%u", devnode, mode, uid, gid);
}
/* apply SECLABEL{$module}=$label */
udev_list_entry_foreach(entry, udev_list_get_entry(seclabel_list)) {
const char *name, *label;
int r;
name = udev_list_entry_get_name(entry);
label = udev_list_entry_get_value(entry);
if (streq(name, "selinux")) {
selinux = true;
r = mac_selinux_apply(devnode, label);
if (r < 0)
log_error_errno(r, "SECLABEL: failed to set SELinux label '%s': %m", label);
else
log_debug("SECLABEL: set SELinux label '%s'", label);
} else if (streq(name, "smack")) {
smack = true;
r = mac_smack_apply(devnode, label);
if (r < 0)
log_error_errno(r, "SECLABEL: failed to set SMACK label '%s': %m", label);
else
log_debug("SECLABEL: set SMACK label '%s'", label);
} else
log_error("SECLABEL: unknown subsystem, ignoring '%s'='%s'", name, label);
}
/* set the defaults */
if (!selinux)
mac_selinux_fix(devnode, true, false);
if (!smack)
mac_smack_apply(devnode, NULL);
}
/* always update timestamp when we re-use the node, like on media change events */
utimensat(AT_FDCWD, devnode, NULL, 0);
out:
return err;
}
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;
}
static int adm_monitor(struct udev *udev, int argc, char *argv[]) {
struct sigaction act = {};
sigset_t mask;
bool prop = false;
bool print_kernel = false;
bool print_udev = false;
_cleanup_udev_list_cleanup_ struct udev_list subsystem_match_list;
_cleanup_udev_list_cleanup_ struct udev_list tag_match_list;
_cleanup_udev_monitor_unref_ struct udev_monitor *udev_monitor = NULL;
_cleanup_udev_monitor_unref_ struct udev_monitor *kernel_monitor = NULL;
_cleanup_close_ int fd_ep = -1;
int fd_kernel = -1, fd_udev = -1;
struct epoll_event ep_kernel, ep_udev;
int c;
static const struct option options[] = {
{ "property", no_argument, NULL, 'p' },
{ "environment", no_argument, NULL, 'e' }, /* alias for -p */
{ "kernel", no_argument, NULL, 'k' },
{ "udev", no_argument, NULL, 'u' },
{ "subsystem-match", required_argument, NULL, 's' },
{ "tag-match", required_argument, NULL, 't' },
{ "help", no_argument, NULL, 'h' },
{}
};
udev_list_init(udev, &subsystem_match_list, true);
udev_list_init(udev, &tag_match_list, true);
while ((c = getopt_long(argc, argv, "pekus:t:h", options, NULL)) >= 0)
switch (c) {
case 'p':
case 'e':
prop = true;
break;
case 'k':
print_kernel = true;
break;
case 'u':
print_udev = true;
break;
case 's':
{
char subsys[UTIL_NAME_SIZE];
char *devtype;
strscpy(subsys, sizeof(subsys), optarg);
devtype = strchr(subsys, '/');
if (devtype != NULL) {
devtype[0] = '\0';
devtype++;
}
udev_list_entry_add(&subsystem_match_list, subsys, devtype);
break;
}
case 't':
udev_list_entry_add(&tag_match_list, optarg, NULL);
break;
case 'h':
help();
return 0;
default:
return 1;
}
if (!print_kernel && !print_udev) {
print_kernel = true;
print_udev = true;
}
/* set signal handlers */
act.sa_handler = sig_handler;
act.sa_flags = SA_RESTART;
sigaction(SIGINT, &act, NULL);
sigaction(SIGTERM, &act, NULL);
sigemptyset(&mask);
sigaddset(&mask, SIGINT);
sigaddset(&mask, SIGTERM);
sigprocmask(SIG_UNBLOCK, &mask, NULL);
/* Callers are expecting to see events as they happen: Line buffering */
setlinebuf(stdout);
fd_ep = epoll_create1(EPOLL_CLOEXEC);
if (fd_ep < 0) {
log_error_errno(errno, "error creating epoll fd: %m");
return 1;
}
printf("monitor will print the received events for:\n");
if (print_udev) {
struct udev_list_entry *entry;
udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
if (udev_monitor == NULL) {
fprintf(stderr, "error: unable to create netlink socket\n");
return 1;
}
udev_monitor_set_receive_buffer_size(udev_monitor, 128*1024*1024);
fd_udev = udev_monitor_get_fd(udev_monitor);
udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
const char *subsys = udev_list_entry_get_name(entry);
const char *devtype = udev_list_entry_get_value(entry);
if (udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, subsys, devtype) < 0)
fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
}
udev_list_entry_foreach(entry, udev_list_get_entry(&tag_match_list)) {
const char *tag = udev_list_entry_get_name(entry);
if (udev_monitor_filter_add_match_tag(udev_monitor, tag) < 0)
fprintf(stderr, "error: unable to apply tag filter '%s'\n", tag);
}
if (udev_monitor_enable_receiving(udev_monitor) < 0) {
fprintf(stderr, "error: unable to subscribe to udev events\n");
return 2;
}
memzero(&ep_udev, sizeof(struct epoll_event));
ep_udev.events = EPOLLIN;
ep_udev.data.fd = fd_udev;
if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_udev, &ep_udev) < 0) {
log_error_errno(errno, "fail to add fd to epoll: %m");
return 2;
}
printf("UDEV - the event which udev sends out after rule processing\n");
}
if (print_kernel) {
struct udev_list_entry *entry;
kernel_monitor = udev_monitor_new_from_netlink(udev, "kernel");
if (kernel_monitor == NULL) {
fprintf(stderr, "error: unable to create netlink socket\n");
return 3;
}
udev_monitor_set_receive_buffer_size(kernel_monitor, 128*1024*1024);
fd_kernel = udev_monitor_get_fd(kernel_monitor);
udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
const char *subsys = udev_list_entry_get_name(entry);
if (udev_monitor_filter_add_match_subsystem_devtype(kernel_monitor, subsys, NULL) < 0)
fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
}
if (udev_monitor_enable_receiving(kernel_monitor) < 0) {
fprintf(stderr, "error: unable to subscribe to kernel events\n");
return 4;
}
memzero(&ep_kernel, sizeof(struct epoll_event));
ep_kernel.events = EPOLLIN;
ep_kernel.data.fd = fd_kernel;
if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_kernel, &ep_kernel) < 0) {
log_error_errno(errno, "fail to add fd to epoll: %m");
return 5;
}
printf("KERNEL - the kernel uevent\n");
}
printf("\n");
while (!udev_exit) {
int fdcount;
struct epoll_event ev[4];
int i;
fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
if (fdcount < 0) {
if (errno != EINTR)
fprintf(stderr, "error receiving uevent message: %m\n");
continue;
}
for (i = 0; i < fdcount; i++) {
if (ev[i].data.fd == fd_kernel && ev[i].events & EPOLLIN) {
struct udev_device *device;
device = udev_monitor_receive_device(kernel_monitor);
if (device == NULL)
continue;
print_device(device, "KERNEL", prop);
udev_device_unref(device);
} else if (ev[i].data.fd == fd_udev && ev[i].events & EPOLLIN) {
struct udev_device *device;
device = udev_monitor_receive_device(udev_monitor);
if (device == NULL)
continue;
print_device(device, "UDEV", prop);
udev_device_unref(device);
}
}
}
return 0;
}
struct udev_list_entry *udev_get_properties_list_entry(struct udev *udev)
{
return udev_list_get_entry(&udev->properties_list);
}