#include <stdlib.h>

#include <string.h>

#include <stdio.h>

#include <stddef.h>

#include <ctype.h>

#include <stdarg.h>

#include <unistd.h>

#include <dirent.h>

#include <errno.h>

#include <getopt.h>

#include <fcntl.h>

#include <sys/stat.h>

#include <sys/types.h>

#include "udev.h"

static bool skip_attribute(const char *name)

{

static const char* const skip[] = {

"uevent",

"dev",

"modalias",

"resource",

"driver",

"subsystem",

"module",

};

unsigned int i;

for (i = 0; i < ELEMENTSOF(skip); i++)

if (streq(name, skip[i]))

return true;

return false;

}

static void print_all_attributes(struct udev_device *device, const char *key)

{

struct udev_list_entry *sysattr;

udev_list_entry_foreach(sysattr, udev_device_get_sysattr_list_entry(device)) {

const char *name;

const char *value;

size_t len;

name = udev_list_entry_get_name(sysattr);

if (skip_attribute(name))

continue;

value = udev_device_get_sysattr_value(device, name);

if (value == NULL)

continue;

/* skip any values that look like a path */

if (value[0] == '/')

continue;

/* skip nonprintable attributes */

len = strlen(value);

while (len > 0 && isprint(value[len-1]))

len--;

if (len > 0)

continue;

printf(" %s{%s}==\"%s\"\n", key, name, value);

}

printf("\n");

}

static int print_device_chain(struct udev_device *device)

{

struct udev_device *device_parent;

const char *str;

printf("\n"

"Udevadm info starts with the device specified by the devpath and then\n"

"walks up the chain of parent devices. It prints for every device\n"

"found, all possible attributes in the udev rules key format.\n"

"A rule to match, can be composed by the attributes of the device\n"

"and the attributes from one single parent device.\n"

"\n");

printf(" looking at device '%s':\n", udev_device_get_devpath(device));

printf(" KERNEL==\"%s\"\n", udev_device_get_sysname(device));

str = udev_device_get_subsystem(device);

if (str == NULL)

str = "";

printf(" SUBSYSTEM==\"%s\"\n", str);

str = udev_device_get_driver(device);

if (str == NULL)

str = "";

printf(" DRIVER==\"%s\"\n", str);

print_all_attributes(device, "ATTR");

device_parent = device;

do {

device_parent = udev_device_get_parent(device_parent);

if (device_parent == NULL)

break;

printf(" looking at parent device '%s':\n", udev_device_get_devpath(device_parent));

printf(" KERNELS==\"%s\"\n", udev_device_get_sysname(device_parent));

str = udev_device_get_subsystem(device_parent);

if (str == NULL)

str = "";

printf(" SUBSYSTEMS==\"%s\"\n", str);

str = udev_device_get_driver(device_parent);

if (str == NULL)

str = "";

printf(" DRIVERS==\"%s\"\n", str);

print_all_attributes(device_parent, "ATTRS");

} while (device_parent != NULL);

return 0;

}

static void print_record(struct udev_device *device)

{

const char *str;

int i;

struct udev_list_entry *list_entry;

printf("P: %s\n", udev_device_get_devpath(device));

str = udev_device_get_devnode(device);

if (str != NULL)

printf("N: %s\n", str + strlen("/dev/"));

i = udev_device_get_devlink_priority(device);

if (i != 0)

printf("L: %i\n", i);

udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(device))

printf("S: %s\n", udev_list_entry_get_name(list_entry) + strlen("/dev/"));

udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(device))

printf("E: %s=%s\n",

udev_list_entry_get_name(list_entry),

udev_list_entry_get_value(list_entry));

printf("\n");

}

static int stat_device(const char *name, bool export, const char *prefix)

{

struct stat statbuf;

if (stat(name, &statbuf) != 0)

return -1;

if (export) {

if (prefix == NULL)

prefix = "INFO_";

printf("%sMAJOR=%d\n"

"%sMINOR=%d\n",

prefix, major(statbuf.st_dev),

prefix, minor(statbuf.st_dev));

} else

printf("%d:%d\n", major(statbuf.st_dev), minor(statbuf.st_dev));

return 0;

}

static int export_devices(struct udev *udev)

{

struct udev_enumerate *udev_enumerate;

struct udev_list_entry *list_entry;

udev_enumerate = udev_enumerate_new(udev);

if (udev_enumerate == NULL)

return -1;

udev_enumerate_scan_devices(udev_enumerate);

udev_list_entry_foreach(list_entry, udev_enumerate_get_list_entry(udev_enumerate)) {

struct udev_device *device;

device = udev_device_new_from_syspath(udev, udev_list_entry_get_name(list_entry));

if (device != NULL) {

print_record(device);

udev_device_unref(device);

}

}

udev_enumerate_unref(udev_enumerate);

return 0;

}

static void cleanup_dir(DIR *dir, mode_t mask, int depth)

{

struct dirent *dent;

if (depth <= 0)

return;

for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {

struct stat stats;

if (dent->d_name[0] == '.')

continue;

if (fstatat(dirfd(dir), dent->d_name, &stats, AT_SYMLINK_NOFOLLOW) != 0)

continue;

if ((stats.st_mode & mask) != 0)

continue;

if (S_ISDIR(stats.st_mode)) {

DIR *dir2;

dir2 = fdopendir(openat(dirfd(dir), dent->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC));

if (dir2 != NULL) {

cleanup_dir(dir2, mask, depth-1);

closedir(dir2);

}

unlinkat(dirfd(dir), dent->d_name, AT_REMOVEDIR);

} else {

unlinkat(dirfd(dir), dent->d_name, 0);

}

}

}

static void cleanup_db(struct udev *udev)

{

DIR *dir;

unlink("/run/udev/queue.bin");

dir = opendir("/run/udev/data");

if (dir != NULL) {

cleanup_dir(dir, S_ISVTX, 1);

closedir(dir);

}

dir = opendir("/run/udev/links");

if (dir != NULL) {

cleanup_dir(dir, 0, 2);

closedir(dir);

}

dir = opendir("/run/udev/tags");

if (dir != NULL) {

cleanup_dir(dir, 0, 2);

closedir(dir);

}

dir = opendir("/run/udev/watch");

if (dir != NULL) {

cleanup_dir(dir, 0, 1);

closedir(dir);

}

}

static struct udev_device *find_device(struct udev *udev, const char *id, const char *prefix)

{

char name[UTIL_PATH_SIZE];

if (prefix && !startswith(id, prefix)) {

strscpyl(name, sizeof(name), prefix, id, NULL);

id = name;

}

if (startswith(id, "/dev/")) {

struct stat statbuf;

char type;

if (stat(id, &statbuf) < 0)

return NULL;

if (S_ISBLK(statbuf.st_mode))

type = 'b';

else if (S_ISCHR(statbuf.st_mode))

type = 'c';

else

return NULL;

return udev_device_new_from_devnum(udev, type, statbuf.st_rdev);

} else if (startswith(id, "/sys/"))

return udev_device_new_from_syspath(udev, id);

else

return NULL;

}

static int uinfo(struct udev *udev, int argc, char *argv[])

{

struct udev_device *device = NULL;

bool root = 0;

bool export = 0;

const char *export_prefix = NULL;

char name[UTIL_PATH_SIZE];

struct udev_list_entry *list_entry;

int rc = 0;

static const struct option options[] = {

{ "name", required_argument, NULL, 'n' },

{ "path", required_argument, NULL, 'p' },

{ "query", required_argument, NULL, 'q' },

{ "attribute-walk", no_argument, NULL, 'a' },

{ "cleanup-db", no_argument, NULL, 'c' },

{ "export-db", no_argument, NULL, 'e' },

{ "root", no_argument, NULL, 'r' },

{ "device-id-of-file", required_argument, NULL, 'd' },

{ "export", no_argument, NULL, 'x' },

{ "export-prefix", required_argument, NULL, 'P' },

{ "version", no_argument, NULL, 'V' },

{ "help", no_argument, NULL, 'h' },

{}

};

static const char *usage =

"Usage: udevadm info OPTIONS\n"

" --query=<type> query device information:\n"

" name name of device node\n"

" symlink pointing to node\n"

" path sys device path\n"

" property the device properties\n"

" all all values\n"

" --path=<syspath> sys device path used for query or attribute walk\n"

" --name=<name> node or symlink name used for query or attribute walk\n"

" --root prepend dev directory to path names\n"

" --attribute-walk print all key matches while walking along the chain\n"

" of parent devices\n"

" --device-id-of-file=<file> print major:minor of device containing this file\n"

" --export export key/value pairs\n"

" --export-prefix export the key name with a prefix\n"

" --export-db export the content of the udev database\n"

" --cleanup-db cleanup the udev database\n"

" --help\n";

enum action_type {

ACTION_QUERY,

ACTION_ATTRIBUTE_WALK,

ACTION_DEVICE_ID_FILE,

} action = ACTION_QUERY;

enum query_type {

QUERY_NAME,

QUERY_PATH,

QUERY_SYMLINK,

QUERY_PROPERTY,

QUERY_ALL,

} query = QUERY_ALL;

for (;;) {

int option;

option = getopt_long(argc, argv, "aced:n:p:q:rxP:RVh", options, NULL);

if (option == -1)

break;

switch (option) {

case 'n': {

if (device != NULL) {

fprintf(stderr, "device already specified\n");

rc = 2;

goto exit;

}

device = find_device(udev, optarg, "/dev/");

if (device == NULL) {

fprintf(stderr, "device node not found\n");

rc = 2;

goto exit;

}

break;

}

case 'p':

if (device != NULL) {

fprintf(stderr, "device already specified\n");

rc = 2;

goto exit;

}

device = find_device(udev, optarg, "/sys");

if (device == NULL) {

fprintf(stderr, "syspath not found\n");

rc = 2;

goto exit;

}

break;

case 'q':

action = ACTION_QUERY;

if (streq(optarg, "property") || streq(optarg, "env")) {

query = QUERY_PROPERTY;

} else if (streq(optarg, "name")) {

query = QUERY_NAME;

} else if (streq(optarg, "symlink")) {

query = QUERY_SYMLINK;

} else if (streq(optarg, "path")) {

query = QUERY_PATH;

} else if (streq(optarg, "all")) {

query = QUERY_ALL;

} else {

fprintf(stderr, "unknown query type\n");

rc = 3;

goto exit;

}

break;

case 'r':

root = true;

break;

case 'd':

action = ACTION_DEVICE_ID_FILE;

strscpy(name, sizeof(name), optarg);

break;

case 'a':

action = ACTION_ATTRIBUTE_WALK;

break;

case 'e':

export_devices(udev);

goto exit;

case 'c':

cleanup_db(udev);

goto exit;

case 'x':

export = true;

break;

case 'P':

export_prefix = optarg;

break;

case 'V':

printf("%s\n", VERSION);

goto exit;

case 'h':

printf("%s\n", usage);

goto exit;

default:

rc = 1;

goto exit;

}

}

switch (action) {

case ACTION_QUERY:

if (!device) {

if (!argv[optind]) {

fprintf(stderr, "%s\n", usage);

rc = 2;

goto exit;

}

device = find_device(udev, argv[optind], NULL);

if (!device) {

fprintf(stderr, "Unknown device, --name=, --path=, or absolute path in /dev/ or /sys expected.\n");

rc = 4;

goto exit;

}

}

switch(query) {

case QUERY_NAME: {

const char *node = udev_device_get_devnode(device);

if (node == NULL) {

fprintf(stderr, "no device node found\n");

rc = 5;

goto exit;

}

if (root)

printf("%s\n", udev_device_get_devnode(device));

else

printf("%s\n", udev_device_get_devnode(device) + strlen("/dev/"));

break;

}

case QUERY_SYMLINK:

list_entry = udev_device_get_devlinks_list_entry(device);

while (list_entry != NULL) {

if (root)

printf("%s", udev_list_entry_get_name(list_entry));

else

printf("%s", udev_list_entry_get_name(list_entry) + strlen("/dev/"));

list_entry = udev_list_entry_get_next(list_entry);

if (list_entry != NULL)

printf(" ");

}

printf("\n");

break;

case QUERY_PATH:

printf("%s\n", udev_device_get_devpath(device));

goto exit;

case QUERY_PROPERTY:

list_entry = udev_device_get_properties_list_entry(device);

while (list_entry != NULL) {

if (export) {

const char *prefix = export_prefix;

if (prefix == NULL)

prefix = "";

printf("%s%s='%s'\n", prefix,

udev_list_entry_get_name(list_entry),

udev_list_entry_get_value(list_entry));

} else {

printf("%s=%s\n", udev_list_entry_get_name(list_entry), udev_list_entry_get_value(list_entry));

}

list_entry = udev_list_entry_get_next(list_entry);

}

break;

case QUERY_ALL:

print_record(device);

break;

default:

fprintf(stderr, "unknown query type\n");

break;

}

break;

case ACTION_ATTRIBUTE_WALK:

if (!device && argv[optind]) {

device = find_device(udev, argv[optind], NULL);

if (!device) {

fprintf(stderr, "Unknown device, absolute path in /dev/ or /sys expected.\n");

rc = 4;

goto exit;

}

}

if (!device) {

fprintf(stderr, "Unknown device, --name=, --path=, or absolute path in /dev/ or /sys expected.\n");

rc = 4;

goto exit;

}

print_device_chain(device);

break;

case ACTION_DEVICE_ID_FILE:

if (stat_device(name, export, export_prefix) != 0)

rc = 1;

break;

}

exit:

udev_device_unref(device);

return rc;

}

const struct udevadm_cmd udevadm_info = {

.name = "info",

.cmd = uinfo,

.help = "query sysfs or the udev database",

};