454 lines
16 KiB
C
454 lines
16 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "sd-device.h"
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#include "alloc-util.h"
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#include "device-enumerator-private.h"
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#include "device-private.h"
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#include "device-util.h"
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#include "dirent-util.h"
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#include "fd-util.h"
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#include "string-util.h"
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#include "udevadm.h"
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#include "udevadm-util.h"
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static bool skip_attribute(const char *name) {
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static const char* const skip[] = {
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"uevent",
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"dev",
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"modalias",
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"resource",
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"driver",
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"subsystem",
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"module",
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};
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unsigned i;
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for (i = 0; i < ELEMENTSOF(skip); i++)
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if (streq(name, skip[i]))
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return true;
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return false;
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}
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static void print_all_attributes(sd_device *device, const char *key) {
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const char *name, *value;
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FOREACH_DEVICE_PROPERTY(device, name, value) {
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size_t len;
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if (skip_attribute(name))
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continue;
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/* skip any values that look like a path */
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if (value[0] == '/')
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continue;
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/* skip nonprintable attributes */
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len = strlen(value);
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while (len > 0 && isprint(value[len-1]))
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len--;
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if (len > 0)
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continue;
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printf(" %s{%s}==\"%s\"\n", key, name, value);
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}
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printf("\n");
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}
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static int print_device_chain(sd_device *device) {
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sd_device *child, *parent;
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const char *str;
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printf("\n"
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"Udevadm info starts with the device specified by the devpath and then\n"
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"walks up the chain of parent devices. It prints for every device\n"
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"found, all possible attributes in the udev rules key format.\n"
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"A rule to match, can be composed by the attributes of the device\n"
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"and the attributes from one single parent device.\n"
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"\n");
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(void) sd_device_get_devpath(device, &str);
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printf(" looking at device '%s':\n", str);
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(void) sd_device_get_sysname(device, &str);
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printf(" KERNEL==\"%s\"\n", str);
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if (sd_device_get_subsystem(device, &str) < 0)
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str = "";
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printf(" SUBSYSTEM==\"%s\"\n", str);
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if (sd_device_get_driver(device, &str) < 0)
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str = "";
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printf(" DRIVER==\"%s\"\n", str);
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print_all_attributes(device, "ATTR");
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for (child = device; sd_device_get_parent(child, &parent) >= 0; child = parent) {
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(void) sd_device_get_devpath(parent, &str);
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printf(" looking at parent device '%s':\n", str);
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(void) sd_device_get_sysname(parent, &str);
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printf(" KERNELS==\"%s\"\n", str);
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if (sd_device_get_subsystem(parent, &str) < 0)
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str = "";
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printf(" SUBSYSTEMS==\"%s\"\n", str);
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if (sd_device_get_driver(parent, &str) < 0)
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str = "";
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printf(" DRIVERS==\"%s\"\n", str);
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print_all_attributes(parent, "ATTRS");
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}
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return 0;
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}
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static void print_record(sd_device *device) {
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const char *str, *val;
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int i;
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(void) sd_device_get_devpath(device, &str);
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printf("P: %s\n", str);
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if (sd_device_get_devname(device, &str) >= 0)
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printf("N: %s\n", str + STRLEN("/dev/"));
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if (device_get_devlink_priority(device, &i) >= 0)
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printf("L: %i\n", i);
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FOREACH_DEVICE_DEVLINK(device, str)
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printf("S: %s\n", str + STRLEN("/dev/"));
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FOREACH_DEVICE_PROPERTY(device, str, val)
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printf("E: %s=%s\n", str, val);
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printf("\n");
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}
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static int stat_device(const char *name, bool export, const char *prefix) {
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struct stat statbuf;
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if (stat(name, &statbuf) != 0)
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return -errno;
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if (export) {
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if (!prefix)
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prefix = "INFO_";
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printf("%sMAJOR=%u\n"
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"%sMINOR=%u\n",
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prefix, major(statbuf.st_dev),
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prefix, minor(statbuf.st_dev));
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} else
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printf("%u:%u\n", major(statbuf.st_dev), minor(statbuf.st_dev));
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return 0;
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}
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static int export_devices(void) {
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_cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
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sd_device *d;
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int r;
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r = sd_device_enumerator_new(&e);
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if (r < 0)
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return r;
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r = sd_device_enumerator_allow_uninitialized(e);
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if (r < 0)
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return r;
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r = device_enumerator_scan_devices(e);
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if (r < 0)
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return r;
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FOREACH_DEVICE_AND_SUBSYSTEM(e, d)
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print_record(d);
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return 0;
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}
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static void cleanup_dir(DIR *dir, mode_t mask, int depth) {
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struct dirent *dent;
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if (depth <= 0)
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return;
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FOREACH_DIRENT_ALL(dent, dir, break) {
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struct stat stats;
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if (dent->d_name[0] == '.')
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continue;
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if (fstatat(dirfd(dir), dent->d_name, &stats, AT_SYMLINK_NOFOLLOW) != 0)
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continue;
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if ((stats.st_mode & mask) != 0)
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continue;
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if (S_ISDIR(stats.st_mode)) {
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_cleanup_closedir_ DIR *dir2 = NULL;
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dir2 = fdopendir(openat(dirfd(dir), dent->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC));
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if (dir2)
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cleanup_dir(dir2, mask, depth-1);
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(void) unlinkat(dirfd(dir), dent->d_name, AT_REMOVEDIR);
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} else
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(void) unlinkat(dirfd(dir), dent->d_name, 0);
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}
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}
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static void cleanup_db(void) {
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_cleanup_closedir_ DIR *dir1 = NULL, *dir2 = NULL, *dir3 = NULL, *dir4 = NULL, *dir5 = NULL;
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(void) unlink("/run/udev/queue.bin");
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dir1 = opendir("/run/udev/data");
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if (dir1)
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cleanup_dir(dir1, S_ISVTX, 1);
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dir2 = opendir("/run/udev/links");
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if (dir2)
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cleanup_dir(dir2, 0, 2);
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dir3 = opendir("/run/udev/tags");
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if (dir3)
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cleanup_dir(dir3, 0, 2);
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dir4 = opendir("/run/udev/static_node-tags");
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if (dir4)
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cleanup_dir(dir4, 0, 2);
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dir5 = opendir("/run/udev/watch");
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if (dir5)
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cleanup_dir(dir5, 0, 1);
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}
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static int help(void) {
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printf("%s info [OPTIONS] [DEVPATH|FILE]\n\n"
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"Query sysfs or the udev database.\n\n"
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" -h --help Print this message\n"
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" -V --version Print version of the program\n"
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" -q --query=TYPE Query device information:\n"
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" name Name of device node\n"
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" symlink Pointing to node\n"
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" path sysfs device path\n"
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" property The device properties\n"
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" all All values\n"
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" -p --path=SYSPATH sysfs device path used for query or attribute walk\n"
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" -n --name=NAME Node or symlink name used for query or attribute walk\n"
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" -r --root Prepend dev directory to path names\n"
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" -a --attribute-walk Print all key matches walking along the chain\n"
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" of parent devices\n"
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" -d --device-id-of-file=FILE Print major:minor of device containing this file\n"
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" -x --export Export key/value pairs\n"
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" -P --export-prefix Export the key name with a prefix\n"
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" -e --export-db Export the content of the udev database\n"
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" -c --cleanup-db Clean up the udev database\n"
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, program_invocation_short_name);
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return 0;
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}
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int info_main(int argc, char *argv[], void *userdata) {
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_cleanup_(sd_device_unrefp) sd_device *device = NULL;
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bool root = false, export = false;
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_cleanup_free_ char *name = NULL;
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const char *export_prefix = NULL;
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int c, r;
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static const struct option options[] = {
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{ "name", required_argument, NULL, 'n' },
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{ "path", required_argument, NULL, 'p' },
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{ "query", required_argument, NULL, 'q' },
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{ "attribute-walk", no_argument, NULL, 'a' },
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{ "cleanup-db", no_argument, NULL, 'c' },
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{ "export-db", no_argument, NULL, 'e' },
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{ "root", no_argument, NULL, 'r' },
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{ "device-id-of-file", required_argument, NULL, 'd' },
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{ "export", no_argument, NULL, 'x' },
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{ "export-prefix", required_argument, NULL, 'P' },
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{ "version", no_argument, NULL, 'V' },
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{ "help", no_argument, NULL, 'h' },
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{}
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};
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enum action_type {
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ACTION_QUERY,
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ACTION_ATTRIBUTE_WALK,
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ACTION_DEVICE_ID_FILE,
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} action = ACTION_QUERY;
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enum query_type {
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QUERY_NAME,
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QUERY_PATH,
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QUERY_SYMLINK,
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QUERY_PROPERTY,
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QUERY_ALL,
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} query = QUERY_ALL;
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while ((c = getopt_long(argc, argv, "aced:n:p:q:rxP:RVh", options, NULL)) >= 0)
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switch (c) {
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case 'n':
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if (device) {
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log_error("device already specified");
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return -EINVAL;
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}
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r = find_device(optarg, "/dev/", &device);
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if (r < 0)
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return log_error_errno(r, "device node not found: %m");
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break;
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case 'p':
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if (device) {
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log_error("device already specified");
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return -EINVAL;
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}
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r = find_device(optarg, "/sys", &device);
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if (r < 0)
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return log_error_errno(r, "syspath not found: %m");
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break;
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case 'q':
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action = ACTION_QUERY;
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if (streq(optarg, "property") || streq(optarg, "env"))
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query = QUERY_PROPERTY;
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else if (streq(optarg, "name"))
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query = QUERY_NAME;
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else if (streq(optarg, "symlink"))
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query = QUERY_SYMLINK;
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else if (streq(optarg, "path"))
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query = QUERY_PATH;
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else if (streq(optarg, "all"))
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query = QUERY_ALL;
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else {
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log_error("unknown query type");
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return -EINVAL;
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}
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break;
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case 'r':
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root = true;
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break;
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case 'd':
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action = ACTION_DEVICE_ID_FILE;
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name = strdup(optarg);
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if (!name)
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return log_oom();
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break;
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case 'a':
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action = ACTION_ATTRIBUTE_WALK;
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break;
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case 'e':
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return export_devices();
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case 'c':
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cleanup_db();
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return 0;
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case 'x':
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export = true;
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break;
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case 'P':
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export_prefix = optarg;
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break;
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case 'V':
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return print_version();
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case 'h':
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return help();
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case '?':
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return -EINVAL;
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default:
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assert_not_reached("Unknown option");
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}
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switch (action) {
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case ACTION_QUERY:
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if (!device) {
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if (!argv[optind]) {
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help();
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return -EINVAL;
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}
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r = find_device(argv[optind], NULL, &device);
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if (r < 0)
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return log_error_errno(r, "Unknown device, --name=, --path=, or absolute path in /dev/ or /sys expected: %m");
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}
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switch(query) {
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case QUERY_NAME: {
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const char *node;
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r = sd_device_get_devname(device, &node);
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if (r < 0)
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return log_error_errno(r, "no device node found: %m");
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if (root)
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printf("%s\n", node);
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else
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printf("%s\n", node + STRLEN("/dev/"));
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break;
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}
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case QUERY_SYMLINK: {
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const char *devlink;
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bool first = true;
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FOREACH_DEVICE_DEVLINK(device, devlink) {
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if (!first)
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printf(" ");
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if (root)
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printf("%s", devlink);
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else
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printf("%s", devlink + STRLEN("/dev/"));
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first = false;
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}
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printf("\n");
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break;
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}
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case QUERY_PATH: {
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const char *devpath;
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r = sd_device_get_devpath(device, &devpath);
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if (r < 0)
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return log_error_errno(r, "Failed to get device path: %m");
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printf("%s\n", devpath);
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return 0;
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}
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case QUERY_PROPERTY: {
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const char *key, *value;
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FOREACH_DEVICE_PROPERTY(device, key, value)
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if (export)
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printf("%s%s='%s'\n", strempty(export_prefix), key, value);
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else
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printf("%s=%s\n", key, value);
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break;
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}
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case QUERY_ALL:
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print_record(device);
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break;
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default:
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assert_not_reached("unknown query type");
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}
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break;
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case ACTION_ATTRIBUTE_WALK:
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if (!device && argv[optind]) {
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r = find_device(argv[optind], NULL, &device);
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if (r < 0)
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return log_error_errno(r, "Unknown device, absolute path in /dev/ or /sys expected: %m");
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}
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if (!device) {
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log_error("Unknown device, --name=, --path=, or absolute path in /dev/ or /sys expected.");
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return -EINVAL;
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}
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print_device_chain(device);
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break;
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case ACTION_DEVICE_ID_FILE:
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r = stat_device(name, export, export_prefix);
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if (r < 0)
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return r;
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break;
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}
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return 0;
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}
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