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-rw-r--r--src/udev/udevadm-info.c470
1 files changed, 470 insertions, 0 deletions
diff --git a/src/udev/udevadm-info.c b/src/udev/udevadm-info.c
new file mode 100644
index 0000000..ebd15d3
--- /dev/null
+++ b/src/udev/udevadm-info.c
@@ -0,0 +1,470 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "sd-device.h"
+
+#include "alloc-util.h"
+#include "device-enumerator-private.h"
+#include "device-private.h"
+#include "device-util.h"
+#include "dirent-util.h"
+#include "fd-util.h"
+#include "string-util.h"
+#include "udevadm.h"
+#include "udevadm-util.h"
+
+typedef enum ActionType {
+ ACTION_QUERY,
+ ACTION_ATTRIBUTE_WALK,
+ ACTION_DEVICE_ID_FILE,
+} ActionType;
+
+typedef enum QueryType {
+ QUERY_NAME,
+ QUERY_PATH,
+ QUERY_SYMLINK,
+ QUERY_PROPERTY,
+ QUERY_ALL,
+} QueryType;
+
+static bool arg_root = false;
+static bool arg_export = false;
+static const char *arg_export_prefix = NULL;
+
+static bool skip_attribute(const char *name) {
+ static const char* const skip[] = {
+ "uevent",
+ "dev",
+ "modalias",
+ "resource",
+ "driver",
+ "subsystem",
+ "module",
+ };
+ unsigned i;
+
+ for (i = 0; i < ELEMENTSOF(skip); i++)
+ if (streq(name, skip[i]))
+ return true;
+ return false;
+}
+
+static void print_all_attributes(sd_device *device, const char *key) {
+ const char *name, *value;
+
+ FOREACH_DEVICE_SYSATTR(device, name) {
+ size_t len;
+
+ if (skip_attribute(name))
+ continue;
+
+ if (sd_device_get_sysattr_value(device, name, &value) < 0)
+ 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);
+ }
+ puts("");
+}
+
+static int print_device_chain(sd_device *device) {
+ sd_device *child, *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");
+
+ (void) sd_device_get_devpath(device, &str);
+ printf(" looking at device '%s':\n", str);
+ (void) sd_device_get_sysname(device, &str);
+ printf(" KERNEL==\"%s\"\n", str);
+ if (sd_device_get_subsystem(device, &str) < 0)
+ str = "";
+ printf(" SUBSYSTEM==\"%s\"\n", str);
+ if (sd_device_get_driver(device, &str) < 0)
+ str = "";
+ printf(" DRIVER==\"%s\"\n", str);
+ print_all_attributes(device, "ATTR");
+
+ for (child = device; sd_device_get_parent(child, &parent) >= 0; child = parent) {
+ (void) sd_device_get_devpath(parent, &str);
+ printf(" looking at parent device '%s':\n", str);
+ (void) sd_device_get_sysname(parent, &str);
+ printf(" KERNELS==\"%s\"\n", str);
+ if (sd_device_get_subsystem(parent, &str) < 0)
+ str = "";
+ printf(" SUBSYSTEMS==\"%s\"\n", str);
+ if (sd_device_get_driver(parent, &str) < 0)
+ str = "";
+ printf(" DRIVERS==\"%s\"\n", str);
+ print_all_attributes(parent, "ATTRS");
+ }
+
+ return 0;
+}
+
+static int print_record(sd_device *device) {
+ const char *str, *val;
+ int i;
+
+ (void) sd_device_get_devpath(device, &str);
+ printf("P: %s\n", str);
+
+ if (sd_device_get_devname(device, &str) >= 0) {
+ assert_se(val = path_startswith(str, "/dev/"));
+ printf("N: %s\n", val);
+ }
+
+ if (device_get_devlink_priority(device, &i) >= 0)
+ printf("L: %i\n", i);
+
+ FOREACH_DEVICE_DEVLINK(device, str) {
+ assert_se(val = path_startswith(str, "/dev/"));
+ printf("S: %s\n", val);
+ }
+
+ FOREACH_DEVICE_PROPERTY(device, str, val)
+ printf("E: %s=%s\n", str, val);
+
+ puts("");
+ return 0;
+}
+
+static int stat_device(const char *name, bool export, const char *prefix) {
+ struct stat statbuf;
+
+ if (stat(name, &statbuf) != 0)
+ return -errno;
+
+ if (export) {
+ if (!prefix)
+ prefix = "INFO_";
+ printf("%sMAJOR=%u\n"
+ "%sMINOR=%u\n",
+ prefix, major(statbuf.st_dev),
+ prefix, minor(statbuf.st_dev));
+ } else
+ printf("%u:%u\n", major(statbuf.st_dev), minor(statbuf.st_dev));
+ return 0;
+}
+
+static int export_devices(void) {
+ _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
+ sd_device *d;
+ int r;
+
+ r = sd_device_enumerator_new(&e);
+ if (r < 0)
+ return r;
+
+ r = sd_device_enumerator_allow_uninitialized(e);
+ if (r < 0)
+ return r;
+
+ r = device_enumerator_scan_devices(e);
+ if (r < 0)
+ return r;
+
+ FOREACH_DEVICE_AND_SUBSYSTEM(e, d)
+ print_record(d);
+
+ return 0;
+}
+
+static void cleanup_dir(DIR *dir, mode_t mask, int depth) {
+ struct dirent *dent;
+
+ if (depth <= 0)
+ return;
+
+ FOREACH_DIRENT_ALL(dent, dir, break) {
+ 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)) {
+ _cleanup_closedir_ DIR *dir2 = NULL;
+
+ dir2 = fdopendir(openat(dirfd(dir), dent->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC));
+ if (dir2)
+ cleanup_dir(dir2, mask, depth-1);
+
+ (void) unlinkat(dirfd(dir), dent->d_name, AT_REMOVEDIR);
+ } else
+ (void) unlinkat(dirfd(dir), dent->d_name, 0);
+ }
+}
+
+static void cleanup_db(void) {
+ _cleanup_closedir_ DIR *dir1 = NULL, *dir2 = NULL, *dir3 = NULL, *dir4 = NULL, *dir5 = NULL;
+
+ (void) unlink("/run/udev/queue.bin");
+
+ dir1 = opendir("/run/udev/data");
+ if (dir1)
+ cleanup_dir(dir1, S_ISVTX, 1);
+
+ dir2 = opendir("/run/udev/links");
+ if (dir2)
+ cleanup_dir(dir2, 0, 2);
+
+ dir3 = opendir("/run/udev/tags");
+ if (dir3)
+ cleanup_dir(dir3, 0, 2);
+
+ dir4 = opendir("/run/udev/static_node-tags");
+ if (dir4)
+ cleanup_dir(dir4, 0, 2);
+
+ dir5 = opendir("/run/udev/watch");
+ if (dir5)
+ cleanup_dir(dir5, 0, 1);
+}
+
+static int query_device(QueryType query, sd_device* device) {
+ int r;
+
+ assert(device);
+
+ switch(query) {
+ case QUERY_NAME: {
+ const char *node;
+
+ r = sd_device_get_devname(device, &node);
+ if (r < 0)
+ return log_error_errno(r, "No device node found: %m");
+
+ if (!arg_root)
+ assert_se(node = path_startswith(node, "/dev/"));
+ printf("%s\n", node);
+ return 0;
+ }
+
+ case QUERY_SYMLINK: {
+ const char *devlink, *prefix = "";
+
+ FOREACH_DEVICE_DEVLINK(device, devlink) {
+ if (!arg_root)
+ assert_se(devlink = path_startswith(devlink, "/dev/"));
+ printf("%s%s", prefix, devlink);
+ prefix = " ";
+ }
+ puts("");
+ return 0;
+ }
+
+ case QUERY_PATH: {
+ const char *devpath;
+
+ r = sd_device_get_devpath(device, &devpath);
+ if (r < 0)
+ return log_error_errno(r, "Failed to get device path: %m");
+
+ printf("%s\n", devpath);
+ return 0;
+ }
+
+ case QUERY_PROPERTY: {
+ const char *key, *value;
+
+ FOREACH_DEVICE_PROPERTY(device, key, value)
+ if (arg_export)
+ printf("%s%s='%s'\n", strempty(arg_export_prefix), key, value);
+ else
+ printf("%s=%s\n", key, value);
+ return 0;
+ }
+
+ case QUERY_ALL:
+ return print_record(device);
+ }
+
+ assert_not_reached("unknown query type");
+ return 0;
+}
+
+static int help(void) {
+ printf("%s info [OPTIONS] [DEVPATH|FILE]\n\n"
+ "Query sysfs or the udev database.\n\n"
+ " -h --help Print this message\n"
+ " -V --version Print version of the program\n"
+ " -q --query=TYPE Query device information:\n"
+ " name Name of device node\n"
+ " symlink Pointing to node\n"
+ " path sysfs device path\n"
+ " property The device properties\n"
+ " all All values\n"
+ " -p --path=SYSPATH sysfs device path used for query or attribute walk\n"
+ " -n --name=NAME Node or symlink name used for query or attribute walk\n"
+ " -r --root Prepend dev directory to path names\n"
+ " -a --attribute-walk Print all key matches walking along the chain\n"
+ " of parent devices\n"
+ " -d --device-id-of-file=FILE Print major:minor of device containing this file\n"
+ " -x --export Export key/value pairs\n"
+ " -P --export-prefix Export the key name with a prefix\n"
+ " -e --export-db Export the content of the udev database\n"
+ " -c --cleanup-db Clean up the udev database\n"
+ , program_invocation_short_name);
+
+ return 0;
+}
+
+int info_main(int argc, char *argv[], void *userdata) {
+ _cleanup_strv_free_ char **devices = NULL;
+ _cleanup_free_ char *name = NULL;
+ int c, r;
+
+ 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' },
+ {}
+ };
+
+ ActionType action = ACTION_QUERY;
+ QueryType query = QUERY_ALL;
+
+ while ((c = getopt_long(argc, argv, "aced:n:p:q:rxP:RVh", options, NULL)) >= 0)
+ switch (c) {
+ case 'n':
+ case 'p': {
+ const char *prefix = c == 'n' ? "/dev/" : "/sys/";
+ char *path;
+
+ path = path_join(path_startswith(optarg, prefix) ? NULL : prefix, optarg);
+ if (!path)
+ return log_oom();
+
+ r = strv_consume(&devices, path);
+ if (r < 0)
+ return log_oom();
+ 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
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "unknown query type");
+ break;
+ case 'r':
+ arg_root = true;
+ break;
+ case 'd':
+ action = ACTION_DEVICE_ID_FILE;
+ r = free_and_strdup(&name, optarg);
+ if (r < 0)
+ return log_oom();
+ break;
+ case 'a':
+ action = ACTION_ATTRIBUTE_WALK;
+ break;
+ case 'e':
+ return export_devices();
+ case 'c':
+ cleanup_db();
+ return 0;
+ case 'x':
+ arg_export = true;
+ break;
+ case 'P':
+ arg_export = true;
+ arg_export_prefix = optarg;
+ break;
+ case 'V':
+ return print_version();
+ case 'h':
+ return help();
+ case '?':
+ return -EINVAL;
+ default:
+ assert_not_reached("Unknown option");
+ }
+
+ if (action == ACTION_DEVICE_ID_FILE) {
+ if (argv[optind])
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Positional arguments are not allowed with -d/--device-id-of-file.");
+ assert(name);
+ return stat_device(name, arg_export, arg_export_prefix);
+ }
+
+ r = strv_extend_strv(&devices, argv + optind, false);
+ if (r < 0)
+ return log_error_errno(r, "Failed to build argument list: %m");
+
+ if (strv_isempty(devices))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "A device name or path is required");
+ if (action == ACTION_ATTRIBUTE_WALK && strv_length(devices) > 1)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Only one device may be specified with -a/--attribute-walk");
+
+ char **p;
+ STRV_FOREACH(p, devices) {
+ _cleanup_(sd_device_unrefp) sd_device *device = NULL;
+
+ r = find_device(*p, NULL, &device);
+ if (r == -EINVAL)
+ return log_error_errno(r, "Bad argument \"%s\", expected an absolute path in /dev/ or /sys or a unit name: %m", *p);
+ if (r < 0)
+ return log_error_errno(r, "Unknown device \"%s\": %m", *p);
+
+ if (action == ACTION_QUERY)
+ r = query_device(query, device);
+ else if (action == ACTION_ATTRIBUTE_WALK)
+ r = print_device_chain(device);
+ else
+ assert_not_reached("Unknown action");
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
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