/* SPDX-License-Identifier: GPL-2.0+ */ #include #include #include #include #include #include #include #include #include #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-table.h" #include "string-util.h" #include "udevadm-util.h" #include "udevadm.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", }; return string_table_lookup(skip, ELEMENTSOF(skip), name) >= 0; } 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:Vh", 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; }