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-rw-r--r--src/libsystemd/sd-device/device-enumerator-private.h18
-rw-r--r--src/libsystemd/sd-device/device-enumerator.c963
-rw-r--r--src/libsystemd/sd-device/device-internal.h114
-rw-r--r--src/libsystemd/sd-device/device-monitor-private.h20
-rw-r--r--src/libsystemd/sd-device/device-monitor.c772
-rw-r--r--src/libsystemd/sd-device/device-private.c1017
-rw-r--r--src/libsystemd/sd-device/device-private.h78
-rw-r--r--src/libsystemd/sd-device/device-util.h64
-rw-r--r--src/libsystemd/sd-device/sd-device.c1996
-rw-r--r--src/libsystemd/sd-device/test-sd-device-monitor.c218
-rw-r--r--src/libsystemd/sd-device/test-sd-device-thread.c39
-rw-r--r--src/libsystemd/sd-device/test-sd-device.c172
-rw-r--r--src/libsystemd/sd-device/test-udev-device-thread.c36
13 files changed, 5507 insertions, 0 deletions
diff --git a/src/libsystemd/sd-device/device-enumerator-private.h b/src/libsystemd/sd-device/device-enumerator-private.h
new file mode 100644
index 0000000..9c6437d
--- /dev/null
+++ b/src/libsystemd/sd-device/device-enumerator-private.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include "sd-device.h"
+
+int device_enumerator_scan_devices(sd_device_enumerator *enumeartor);
+int device_enumerator_scan_subsystems(sd_device_enumerator *enumeartor);
+int device_enumerator_add_device(sd_device_enumerator *enumerator, sd_device *device);
+int device_enumerator_add_match_is_initialized(sd_device_enumerator *enumerator);
+int device_enumerator_add_match_parent_incremental(sd_device_enumerator *enumerator, sd_device *parent);
+sd_device *device_enumerator_get_first(sd_device_enumerator *enumerator);
+sd_device *device_enumerator_get_next(sd_device_enumerator *enumerator);
+sd_device **device_enumerator_get_devices(sd_device_enumerator *enumerator, size_t *ret_n_devices);
+
+#define FOREACH_DEVICE_AND_SUBSYSTEM(enumerator, device) \
+ for (device = device_enumerator_get_first(enumerator); \
+ device; \
+ device = device_enumerator_get_next(enumerator))
diff --git a/src/libsystemd/sd-device/device-enumerator.c b/src/libsystemd/sd-device/device-enumerator.c
new file mode 100644
index 0000000..3641348
--- /dev/null
+++ b/src/libsystemd/sd-device/device-enumerator.c
@@ -0,0 +1,963 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "sd-device.h"
+
+#include "alloc-util.h"
+#include "device-enumerator-private.h"
+#include "device-util.h"
+#include "dirent-util.h"
+#include "fd-util.h"
+#include "set.h"
+#include "sort-util.h"
+#include "string-util.h"
+#include "strv.h"
+
+#define DEVICE_ENUMERATE_MAX_DEPTH 256
+
+typedef enum DeviceEnumerationType {
+ DEVICE_ENUMERATION_TYPE_DEVICES,
+ DEVICE_ENUMERATION_TYPE_SUBSYSTEMS,
+ _DEVICE_ENUMERATION_TYPE_MAX,
+ _DEVICE_ENUMERATION_TYPE_INVALID = -1,
+} DeviceEnumerationType;
+
+struct sd_device_enumerator {
+ unsigned n_ref;
+
+ DeviceEnumerationType type;
+ sd_device **devices;
+ size_t n_devices, n_allocated, current_device_index;
+ bool scan_uptodate;
+
+ Set *match_subsystem;
+ Set *nomatch_subsystem;
+ Hashmap *match_sysattr;
+ Hashmap *nomatch_sysattr;
+ Hashmap *match_property;
+ Set *match_sysname;
+ Set *match_tag;
+ Set *match_parent;
+ bool match_allow_uninitialized;
+};
+
+_public_ int sd_device_enumerator_new(sd_device_enumerator **ret) {
+ _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *enumerator = NULL;
+
+ assert(ret);
+
+ enumerator = new(sd_device_enumerator, 1);
+ if (!enumerator)
+ return -ENOMEM;
+
+ *enumerator = (sd_device_enumerator) {
+ .n_ref = 1,
+ .type = _DEVICE_ENUMERATION_TYPE_INVALID,
+ };
+
+ *ret = TAKE_PTR(enumerator);
+
+ return 0;
+}
+
+static sd_device_enumerator *device_enumerator_free(sd_device_enumerator *enumerator) {
+ size_t i;
+
+ assert(enumerator);
+
+ for (i = 0; i < enumerator->n_devices; i++)
+ sd_device_unref(enumerator->devices[i]);
+
+ free(enumerator->devices);
+ set_free(enumerator->match_subsystem);
+ set_free(enumerator->nomatch_subsystem);
+ hashmap_free(enumerator->match_sysattr);
+ hashmap_free(enumerator->nomatch_sysattr);
+ hashmap_free(enumerator->match_property);
+ set_free(enumerator->match_sysname);
+ set_free(enumerator->match_tag);
+ set_free(enumerator->match_parent);
+
+ return mfree(enumerator);
+}
+
+DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_device_enumerator, sd_device_enumerator, device_enumerator_free);
+
+_public_ int sd_device_enumerator_add_match_subsystem(sd_device_enumerator *enumerator, const char *subsystem, int match) {
+ Set **set;
+ int r;
+
+ assert_return(enumerator, -EINVAL);
+ assert_return(subsystem, -EINVAL);
+
+ if (match)
+ set = &enumerator->match_subsystem;
+ else
+ set = &enumerator->nomatch_subsystem;
+
+ r = set_put_strdup(set, subsystem);
+ if (r <= 0)
+ return r;
+
+ enumerator->scan_uptodate = false;
+
+ return 1;
+}
+
+_public_ int sd_device_enumerator_add_match_sysattr(sd_device_enumerator *enumerator, const char *sysattr, const char *value, int match) {
+ Hashmap **hashmap;
+ int r;
+
+ assert_return(enumerator, -EINVAL);
+ assert_return(sysattr, -EINVAL);
+
+ if (match)
+ hashmap = &enumerator->match_sysattr;
+ else
+ hashmap = &enumerator->nomatch_sysattr;
+
+ r = hashmap_put_strdup_full(hashmap, &trivial_hash_ops_free_free, sysattr, value);
+ if (r <= 0)
+ return r;
+
+ enumerator->scan_uptodate = false;
+
+ return 1;
+}
+
+_public_ int sd_device_enumerator_add_match_property(sd_device_enumerator *enumerator, const char *property, const char *value) {
+ int r;
+
+ assert_return(enumerator, -EINVAL);
+ assert_return(property, -EINVAL);
+
+ r = hashmap_put_strdup_full(&enumerator->match_property, &trivial_hash_ops_free_free, property, value);
+ if (r <= 0)
+ return r;
+
+ enumerator->scan_uptodate = false;
+
+ return 1;
+}
+
+_public_ int sd_device_enumerator_add_match_sysname(sd_device_enumerator *enumerator, const char *sysname) {
+ int r;
+
+ assert_return(enumerator, -EINVAL);
+ assert_return(sysname, -EINVAL);
+
+ r = set_put_strdup(&enumerator->match_sysname, sysname);
+ if (r <= 0)
+ return r;
+
+ enumerator->scan_uptodate = false;
+
+ return 1;
+}
+
+_public_ int sd_device_enumerator_add_match_tag(sd_device_enumerator *enumerator, const char *tag) {
+ int r;
+
+ assert_return(enumerator, -EINVAL);
+ assert_return(tag, -EINVAL);
+
+ r = set_put_strdup(&enumerator->match_tag, tag);
+ if (r <= 0)
+ return r;
+
+ enumerator->scan_uptodate = false;
+
+ return 1;
+}
+
+int device_enumerator_add_match_parent_incremental(sd_device_enumerator *enumerator, sd_device *parent) {
+ const char *path;
+ int r;
+
+ assert(enumerator);
+ assert(parent);
+
+ r = sd_device_get_syspath(parent, &path);
+ if (r < 0)
+ return r;
+
+ r = set_put_strdup(&enumerator->match_parent, path);
+ if (r <= 0)
+ return r;
+
+ enumerator->scan_uptodate = false;
+
+ return 1;
+}
+
+_public_ int sd_device_enumerator_add_match_parent(sd_device_enumerator *enumerator, sd_device *parent) {
+ assert_return(enumerator, -EINVAL);
+ assert_return(parent, -EINVAL);
+
+ set_clear(enumerator->match_parent);
+
+ return device_enumerator_add_match_parent_incremental(enumerator, parent);
+}
+
+_public_ int sd_device_enumerator_allow_uninitialized(sd_device_enumerator *enumerator) {
+ assert_return(enumerator, -EINVAL);
+
+ enumerator->match_allow_uninitialized = true;
+
+ enumerator->scan_uptodate = false;
+
+ return 1;
+}
+
+int device_enumerator_add_match_is_initialized(sd_device_enumerator *enumerator) {
+ assert_return(enumerator, -EINVAL);
+
+ enumerator->match_allow_uninitialized = false;
+
+ enumerator->scan_uptodate = false;
+
+ return 1;
+}
+
+static int device_compare(sd_device * const *_a, sd_device * const *_b) {
+ sd_device *a = *(sd_device **)_a, *b = *(sd_device **)_b;
+ const char *devpath_a, *devpath_b, *sound_a;
+ bool delay_a, delay_b;
+ int r;
+
+ assert_se(sd_device_get_devpath(a, &devpath_a) >= 0);
+ assert_se(sd_device_get_devpath(b, &devpath_b) >= 0);
+
+ sound_a = strstr(devpath_a, "/sound/card");
+ if (sound_a) {
+ /* For sound cards the control device must be enumerated last to
+ * make sure it's the final device node that gets ACLs applied.
+ * Applications rely on this fact and use ACL changes on the
+ * control node as an indicator that the ACL change of the
+ * entire sound card completed. The kernel makes this guarantee
+ * when creating those devices, and hence we should too when
+ * enumerating them. */
+ sound_a += STRLEN("/sound/card");
+ sound_a = strchr(sound_a, '/');
+
+ if (sound_a) {
+ unsigned prefix_len;
+
+ prefix_len = sound_a - devpath_a;
+
+ if (strncmp(devpath_a, devpath_b, prefix_len) == 0) {
+ const char *sound_b;
+
+ sound_b = devpath_b + prefix_len;
+
+ if (startswith(sound_a, "/controlC") &&
+ !startswith(sound_b, "/contolC"))
+ return 1;
+
+ if (!startswith(sound_a, "/controlC") &&
+ startswith(sound_b, "/controlC"))
+ return -1;
+ }
+ }
+ }
+
+ /* md and dm devices are enumerated after all other devices */
+ delay_a = strstr(devpath_a, "/block/md") || strstr(devpath_a, "/block/dm-");
+ delay_b = strstr(devpath_b, "/block/md") || strstr(devpath_b, "/block/dm-");
+ r = CMP(delay_a, delay_b);
+ if (r != 0)
+ return r;
+
+ return strcmp(devpath_a, devpath_b);
+}
+
+int device_enumerator_add_device(sd_device_enumerator *enumerator, sd_device *device) {
+ assert_return(enumerator, -EINVAL);
+ assert_return(device, -EINVAL);
+
+ if (!GREEDY_REALLOC(enumerator->devices, enumerator->n_allocated, enumerator->n_devices + 1))
+ return -ENOMEM;
+
+ enumerator->devices[enumerator->n_devices++] = sd_device_ref(device);
+
+ return 0;
+}
+
+static bool match_sysattr_value(sd_device *device, const char *sysattr, const char *match_value) {
+ const char *value;
+ int r;
+
+ assert(device);
+ assert(sysattr);
+
+ r = sd_device_get_sysattr_value(device, sysattr, &value);
+ if (r < 0)
+ return false;
+
+ if (!match_value)
+ return true;
+
+ if (fnmatch(match_value, value, 0) == 0)
+ return true;
+
+ return false;
+}
+
+static bool match_sysattr(sd_device_enumerator *enumerator, sd_device *device) {
+ const char *sysattr;
+ const char *value;
+
+ assert(enumerator);
+ assert(device);
+
+ HASHMAP_FOREACH_KEY(value, sysattr, enumerator->nomatch_sysattr)
+ if (match_sysattr_value(device, sysattr, value))
+ return false;
+
+ HASHMAP_FOREACH_KEY(value, sysattr, enumerator->match_sysattr)
+ if (!match_sysattr_value(device, sysattr, value))
+ return false;
+
+ return true;
+}
+
+static bool match_property(sd_device_enumerator *enumerator, sd_device *device) {
+ const char *property;
+ const char *value;
+
+ assert(enumerator);
+ assert(device);
+
+ if (hashmap_isempty(enumerator->match_property))
+ return true;
+
+ HASHMAP_FOREACH_KEY(value, property, enumerator->match_property) {
+ const char *property_dev, *value_dev;
+
+ FOREACH_DEVICE_PROPERTY(device, property_dev, value_dev) {
+ if (fnmatch(property, property_dev, 0) != 0)
+ continue;
+
+ if (!value && !value_dev)
+ return true;
+
+ if (!value || !value_dev)
+ continue;
+
+ if (fnmatch(value, value_dev, 0) == 0)
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static bool match_tag(sd_device_enumerator *enumerator, sd_device *device) {
+ const char *tag;
+
+ assert(enumerator);
+ assert(device);
+
+ SET_FOREACH(tag, enumerator->match_tag)
+ if (!sd_device_has_tag(device, tag))
+ return false;
+
+ return true;
+}
+
+static bool match_parent(sd_device_enumerator *enumerator, sd_device *device) {
+ const char *syspath_parent, *syspath;
+
+ assert(enumerator);
+ assert(device);
+
+ if (set_isempty(enumerator->match_parent))
+ return true;
+
+ assert_se(sd_device_get_syspath(device, &syspath) >= 0);
+
+ SET_FOREACH(syspath_parent, enumerator->match_parent)
+ if (path_startswith(syspath, syspath_parent))
+ return true;
+
+ return false;
+}
+
+static bool match_sysname(sd_device_enumerator *enumerator, const char *sysname) {
+ const char *sysname_match;
+
+ assert(enumerator);
+ assert(sysname);
+
+ if (set_isempty(enumerator->match_sysname))
+ return true;
+
+ SET_FOREACH(sysname_match, enumerator->match_sysname)
+ if (fnmatch(sysname_match, sysname, 0) == 0)
+ return true;
+
+ return false;
+}
+
+static int enumerator_scan_dir_and_add_devices(sd_device_enumerator *enumerator, const char *basedir, const char *subdir1, const char *subdir2) {
+ _cleanup_closedir_ DIR *dir = NULL;
+ char *path;
+ struct dirent *dent;
+ int r = 0;
+
+ assert(enumerator);
+ assert(basedir);
+
+ path = strjoina("/sys/", basedir, "/");
+
+ if (subdir1)
+ path = strjoina(path, subdir1, "/");
+
+ if (subdir2)
+ path = strjoina(path, subdir2, "/");
+
+ dir = opendir(path);
+ if (!dir)
+ /* this is necessarily racey, so ignore missing directories */
+ return (errno == ENOENT && (subdir1 || subdir2)) ? 0 : -errno;
+
+ FOREACH_DIRENT_ALL(dent, dir, return -errno) {
+ _cleanup_(sd_device_unrefp) sd_device *device = NULL;
+ char syspath[strlen(path) + 1 + strlen(dent->d_name) + 1];
+ int initialized, k;
+
+ if (dent->d_name[0] == '.')
+ continue;
+
+ if (!match_sysname(enumerator, dent->d_name))
+ continue;
+
+ (void) sprintf(syspath, "%s%s", path, dent->d_name);
+
+ k = sd_device_new_from_syspath(&device, syspath);
+ if (k < 0) {
+ if (k != -ENODEV)
+ /* this is necessarily racey, so ignore missing devices */
+ r = k;
+
+ continue;
+ }
+
+ initialized = sd_device_get_is_initialized(device);
+ if (initialized < 0) {
+ if (initialized != -ENOENT)
+ /* this is necessarily racey, so ignore missing devices */
+ r = initialized;
+
+ continue;
+ }
+
+ /*
+ * All devices with a device node or network interfaces
+ * possibly need udev to adjust the device node permission
+ * or context, or rename the interface before it can be
+ * reliably used from other processes.
+ *
+ * For now, we can only check these types of devices, we
+ * might not store a database, and have no way to find out
+ * for all other types of devices.
+ */
+ if (!enumerator->match_allow_uninitialized &&
+ !initialized &&
+ (sd_device_get_devnum(device, NULL) >= 0 ||
+ sd_device_get_ifindex(device, NULL) >= 0))
+ continue;
+
+ if (!match_parent(enumerator, device))
+ continue;
+
+ if (!match_tag(enumerator, device))
+ continue;
+
+ if (!match_property(enumerator, device))
+ continue;
+
+ if (!match_sysattr(enumerator, device))
+ continue;
+
+ k = device_enumerator_add_device(enumerator, device);
+ if (k < 0)
+ r = k;
+ }
+
+ return r;
+}
+
+static bool match_subsystem(sd_device_enumerator *enumerator, const char *subsystem) {
+ const char *subsystem_match;
+
+ assert(enumerator);
+
+ if (!subsystem)
+ return false;
+
+ SET_FOREACH(subsystem_match, enumerator->nomatch_subsystem)
+ if (fnmatch(subsystem_match, subsystem, 0) == 0)
+ return false;
+
+ if (set_isempty(enumerator->match_subsystem))
+ return true;
+
+ SET_FOREACH(subsystem_match, enumerator->match_subsystem)
+ if (fnmatch(subsystem_match, subsystem, 0) == 0)
+ return true;
+
+ return false;
+}
+
+static int enumerator_scan_dir(sd_device_enumerator *enumerator, const char *basedir, const char *subdir, const char *subsystem) {
+ _cleanup_closedir_ DIR *dir = NULL;
+ char *path;
+ struct dirent *dent;
+ int r = 0;
+
+ path = strjoina("/sys/", basedir);
+
+ dir = opendir(path);
+ if (!dir)
+ return -errno;
+
+ log_debug("sd-device-enumerator: Scanning %s", path);
+
+ FOREACH_DIRENT_ALL(dent, dir, return -errno) {
+ int k;
+
+ if (dent->d_name[0] == '.')
+ continue;
+
+ if (!match_subsystem(enumerator, subsystem ? : dent->d_name))
+ continue;
+
+ k = enumerator_scan_dir_and_add_devices(enumerator, basedir, dent->d_name, subdir);
+ if (k < 0)
+ r = k;
+ }
+
+ return r;
+}
+
+static int enumerator_scan_devices_tag(sd_device_enumerator *enumerator, const char *tag) {
+ _cleanup_closedir_ DIR *dir = NULL;
+ char *path;
+ struct dirent *dent;
+ int r = 0;
+
+ assert(enumerator);
+ assert(tag);
+
+ path = strjoina("/run/udev/tags/", tag);
+
+ dir = opendir(path);
+ if (!dir) {
+ if (errno != ENOENT)
+ return log_debug_errno(errno, "sd-device-enumerator: Failed to open tags directory %s: %m", path);
+ return 0;
+ }
+
+ /* TODO: filter away subsystems? */
+
+ FOREACH_DIRENT_ALL(dent, dir, return -errno) {
+ _cleanup_(sd_device_unrefp) sd_device *device = NULL;
+ const char *subsystem, *sysname;
+ int k;
+
+ if (dent->d_name[0] == '.')
+ continue;
+
+ k = sd_device_new_from_device_id(&device, dent->d_name);
+ if (k < 0) {
+ if (k != -ENODEV)
+ /* this is necessarily racy, so ignore missing devices */
+ r = k;
+
+ continue;
+ }
+
+ k = sd_device_get_subsystem(device, &subsystem);
+ if (k < 0) {
+ if (k != -ENOENT)
+ /* this is necessarily racy, so ignore missing devices */
+ r = k;
+ continue;
+ }
+
+ if (!match_subsystem(enumerator, subsystem))
+ continue;
+
+ k = sd_device_get_sysname(device, &sysname);
+ if (k < 0) {
+ r = k;
+ continue;
+ }
+
+ if (!match_sysname(enumerator, sysname))
+ continue;
+
+ if (!match_parent(enumerator, device))
+ continue;
+
+ if (!match_property(enumerator, device))
+ continue;
+
+ if (!match_sysattr(enumerator, device))
+ continue;
+
+ k = device_enumerator_add_device(enumerator, device);
+ if (k < 0) {
+ r = k;
+ continue;
+ }
+ }
+
+ return r;
+}
+
+static int enumerator_scan_devices_tags(sd_device_enumerator *enumerator) {
+ const char *tag;
+ int r = 0;
+
+ assert(enumerator);
+
+ SET_FOREACH(tag, enumerator->match_tag) {
+ int k;
+
+ k = enumerator_scan_devices_tag(enumerator, tag);
+ if (k < 0)
+ r = k;
+ }
+
+ return r;
+}
+
+static int parent_add_child(sd_device_enumerator *enumerator, const char *path) {
+ _cleanup_(sd_device_unrefp) sd_device *device = NULL;
+ const char *subsystem, *sysname;
+ int r;
+
+ r = sd_device_new_from_syspath(&device, path);
+ if (r == -ENODEV)
+ /* this is necessarily racy, so ignore missing devices */
+ return 0;
+ else if (r < 0)
+ return r;
+
+ r = sd_device_get_subsystem(device, &subsystem);
+ if (r == -ENOENT)
+ return 0;
+ if (r < 0)
+ return r;
+
+ if (!match_subsystem(enumerator, subsystem))
+ return 0;
+
+ r = sd_device_get_sysname(device, &sysname);
+ if (r < 0)
+ return r;
+
+ if (!match_sysname(enumerator, sysname))
+ return 0;
+
+ if (!match_property(enumerator, device))
+ return 0;
+
+ if (!match_sysattr(enumerator, device))
+ return 0;
+
+ r = device_enumerator_add_device(enumerator, device);
+ if (r < 0)
+ return r;
+
+ return 1;
+}
+
+static int parent_crawl_children(sd_device_enumerator *enumerator, const char *path, unsigned maxdepth) {
+ _cleanup_closedir_ DIR *dir = NULL;
+ struct dirent *dent;
+ int r = 0;
+
+ dir = opendir(path);
+ if (!dir)
+ return log_debug_errno(errno, "sd-device-enumerator: Failed to open parent directory %s: %m", path);
+
+ FOREACH_DIRENT_ALL(dent, dir, return -errno) {
+ _cleanup_free_ char *child = NULL;
+ int k;
+
+ if (dent->d_name[0] == '.')
+ continue;
+
+ if (dent->d_type != DT_DIR)
+ continue;
+
+ child = path_join(path, dent->d_name);
+ if (!child)
+ return -ENOMEM;
+
+ k = parent_add_child(enumerator, child);
+ if (k < 0)
+ r = k;
+
+ if (maxdepth > 0)
+ parent_crawl_children(enumerator, child, maxdepth - 1);
+ else
+ log_debug("sd-device-enumerator: Max depth reached, %s: ignoring devices", child);
+ }
+
+ return r;
+}
+
+static int enumerator_scan_devices_children(sd_device_enumerator *enumerator) {
+ const char *path;
+ int r = 0, k;
+
+ SET_FOREACH(path, enumerator->match_parent) {
+ k = parent_add_child(enumerator, path);
+ if (k < 0)
+ r = k;
+
+ k = parent_crawl_children(enumerator, path, DEVICE_ENUMERATE_MAX_DEPTH);
+ if (k < 0)
+ r = k;
+ }
+
+ return r;
+}
+
+static int enumerator_scan_devices_all(sd_device_enumerator *enumerator) {
+ int r = 0;
+
+ log_debug("sd-device-enumerator: Scan all dirs");
+
+ if (access("/sys/subsystem", F_OK) >= 0) {
+ /* we have /subsystem/, forget all the old stuff */
+ r = enumerator_scan_dir(enumerator, "subsystem", "devices", NULL);
+ if (r < 0)
+ return log_debug_errno(r, "sd-device-enumerator: Failed to scan /sys/subsystem: %m");
+ } else {
+ int k;
+
+ k = enumerator_scan_dir(enumerator, "bus", "devices", NULL);
+ if (k < 0)
+ r = log_debug_errno(k, "sd-device-enumerator: Failed to scan /sys/bus: %m");
+
+ k = enumerator_scan_dir(enumerator, "class", NULL, NULL);
+ if (k < 0)
+ r = log_debug_errno(k, "sd-device-enumerator: Failed to scan /sys/class: %m");
+ }
+
+ return r;
+}
+
+static void device_enumerator_dedup_devices(sd_device_enumerator *enumerator) {
+ sd_device **a, **b, **end;
+
+ assert(enumerator);
+
+ if (enumerator->n_devices <= 1)
+ return;
+
+ a = enumerator->devices + 1;
+ b = enumerator->devices;
+ end = enumerator->devices + enumerator->n_devices;
+
+ for (; a < end; a++) {
+ const char *devpath_a, *devpath_b;
+
+ assert_se(sd_device_get_devpath(*a, &devpath_a) >= 0);
+ assert_se(sd_device_get_devpath(*b, &devpath_b) >= 0);
+
+ if (path_equal(devpath_a, devpath_b))
+ sd_device_unref(*a);
+ else
+ *(++b) = *a;
+ }
+
+ enumerator->n_devices = b - enumerator->devices + 1;
+}
+
+int device_enumerator_scan_devices(sd_device_enumerator *enumerator) {
+ int r = 0, k;
+ size_t i;
+
+ assert(enumerator);
+
+ if (enumerator->scan_uptodate &&
+ enumerator->type == DEVICE_ENUMERATION_TYPE_DEVICES)
+ return 0;
+
+ for (i = 0; i < enumerator->n_devices; i++)
+ sd_device_unref(enumerator->devices[i]);
+
+ enumerator->n_devices = 0;
+
+ if (!set_isempty(enumerator->match_tag)) {
+ k = enumerator_scan_devices_tags(enumerator);
+ if (k < 0)
+ r = k;
+ } else if (enumerator->match_parent) {
+ k = enumerator_scan_devices_children(enumerator);
+ if (k < 0)
+ r = k;
+ } else {
+ k = enumerator_scan_devices_all(enumerator);
+ if (k < 0)
+ r = k;
+ }
+
+ typesafe_qsort(enumerator->devices, enumerator->n_devices, device_compare);
+ device_enumerator_dedup_devices(enumerator);
+
+ enumerator->scan_uptodate = true;
+ enumerator->type = DEVICE_ENUMERATION_TYPE_DEVICES;
+
+ return r;
+}
+
+_public_ sd_device *sd_device_enumerator_get_device_first(sd_device_enumerator *enumerator) {
+ int r;
+
+ assert_return(enumerator, NULL);
+
+ r = device_enumerator_scan_devices(enumerator);
+ if (r < 0)
+ return NULL;
+
+ enumerator->current_device_index = 0;
+
+ if (enumerator->n_devices == 0)
+ return NULL;
+
+ return enumerator->devices[0];
+}
+
+_public_ sd_device *sd_device_enumerator_get_device_next(sd_device_enumerator *enumerator) {
+ assert_return(enumerator, NULL);
+
+ if (!enumerator->scan_uptodate ||
+ enumerator->type != DEVICE_ENUMERATION_TYPE_DEVICES ||
+ enumerator->current_device_index + 1 >= enumerator->n_devices)
+ return NULL;
+
+ return enumerator->devices[++enumerator->current_device_index];
+}
+
+int device_enumerator_scan_subsystems(sd_device_enumerator *enumerator) {
+ const char *subsysdir;
+ int r = 0, k;
+ size_t i;
+
+ assert(enumerator);
+
+ if (enumerator->scan_uptodate &&
+ enumerator->type == DEVICE_ENUMERATION_TYPE_SUBSYSTEMS)
+ return 0;
+
+ for (i = 0; i < enumerator->n_devices; i++)
+ sd_device_unref(enumerator->devices[i]);
+
+ enumerator->n_devices = 0;
+
+ /* modules */
+ if (match_subsystem(enumerator, "module")) {
+ k = enumerator_scan_dir_and_add_devices(enumerator, "module", NULL, NULL);
+ if (k < 0)
+ r = log_debug_errno(k, "sd-device-enumerator: Failed to scan modules: %m");
+ }
+
+ if (access("/sys/subsystem", F_OK) >= 0)
+ subsysdir = "subsystem";
+ else
+ subsysdir = "bus";
+
+ /* subsystems (only buses support coldplug) */
+ if (match_subsystem(enumerator, "subsystem")) {
+ k = enumerator_scan_dir_and_add_devices(enumerator, subsysdir, NULL, NULL);
+ if (k < 0)
+ r = log_debug_errno(k, "sd-device-enumerator: Failed to scan subsystems: %m");
+ }
+
+ /* subsystem drivers */
+ if (match_subsystem(enumerator, "drivers")) {
+ k = enumerator_scan_dir(enumerator, subsysdir, "drivers", "drivers");
+ if (k < 0)
+ r = log_debug_errno(k, "sd-device-enumerator: Failed to scan drivers: %m");
+ }
+
+ typesafe_qsort(enumerator->devices, enumerator->n_devices, device_compare);
+ device_enumerator_dedup_devices(enumerator);
+
+ enumerator->scan_uptodate = true;
+ enumerator->type = DEVICE_ENUMERATION_TYPE_SUBSYSTEMS;
+
+ return r;
+}
+
+_public_ sd_device *sd_device_enumerator_get_subsystem_first(sd_device_enumerator *enumerator) {
+ int r;
+
+ assert_return(enumerator, NULL);
+
+ r = device_enumerator_scan_subsystems(enumerator);
+ if (r < 0)
+ return NULL;
+
+ enumerator->current_device_index = 0;
+
+ if (enumerator->n_devices == 0)
+ return NULL;
+
+ return enumerator->devices[0];
+}
+
+_public_ sd_device *sd_device_enumerator_get_subsystem_next(sd_device_enumerator *enumerator) {
+ assert_return(enumerator, NULL);
+
+ if (!enumerator->scan_uptodate ||
+ enumerator->type != DEVICE_ENUMERATION_TYPE_SUBSYSTEMS ||
+ enumerator->current_device_index + 1 >= enumerator->n_devices)
+ return NULL;
+
+ return enumerator->devices[++enumerator->current_device_index];
+}
+
+sd_device *device_enumerator_get_first(sd_device_enumerator *enumerator) {
+ assert_return(enumerator, NULL);
+
+ if (!enumerator->scan_uptodate)
+ return NULL;
+
+ enumerator->current_device_index = 0;
+
+ if (enumerator->n_devices == 0)
+ return NULL;
+
+ return enumerator->devices[0];
+}
+
+sd_device *device_enumerator_get_next(sd_device_enumerator *enumerator) {
+ assert_return(enumerator, NULL);
+
+ if (!enumerator->scan_uptodate ||
+ enumerator->current_device_index + 1 >= enumerator->n_devices)
+ return NULL;
+
+ return enumerator->devices[++enumerator->current_device_index];
+}
+
+sd_device **device_enumerator_get_devices(sd_device_enumerator *enumerator, size_t *ret_n_devices) {
+ assert(enumerator);
+ assert(ret_n_devices);
+
+ if (!enumerator->scan_uptodate)
+ return NULL;
+
+ *ret_n_devices = enumerator->n_devices;
+ return enumerator->devices;
+}
diff --git a/src/libsystemd/sd-device/device-internal.h b/src/libsystemd/sd-device/device-internal.h
new file mode 100644
index 0000000..3321c8e
--- /dev/null
+++ b/src/libsystemd/sd-device/device-internal.h
@@ -0,0 +1,114 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include "sd-device.h"
+
+#include "device-private.h"
+#include "hashmap.h"
+#include "set.h"
+#include "time-util.h"
+
+#define LATEST_UDEV_DATABASE_VERSION 1
+
+struct sd_device {
+ unsigned n_ref;
+
+ /* The database version indicates the supported features by the udev database.
+ * This is saved and parsed in V field.
+ *
+ * 0: None of the following features are supported (systemd version <= 246).
+ * 1: The current tags (Q) and the database version (V) features are implemented (>= 247).
+ */
+ unsigned database_version;
+
+ int watch_handle;
+
+ sd_device *parent;
+
+ OrderedHashmap *properties;
+ Iterator properties_iterator;
+ uint64_t properties_generation; /* changes whenever the properties are changed */
+ uint64_t properties_iterator_generation; /* generation when iteration was started */
+
+ /* the subset of the properties that should be written to the db */
+ OrderedHashmap *properties_db;
+
+ Hashmap *sysattr_values; /* cached sysattr values */
+
+ Set *sysattrs; /* names of sysattrs */
+ Iterator sysattrs_iterator;
+
+ Set *all_tags, *current_tags;
+ Iterator all_tags_iterator, current_tags_iterator;
+ uint64_t all_tags_iterator_generation, current_tags_iterator_generation; /* generation when iteration was started */
+ uint64_t tags_generation; /* changes whenever the tags are changed */
+
+ Set *devlinks;
+ Iterator devlinks_iterator;
+ uint64_t devlinks_generation; /* changes whenever the devlinks are changed */
+ uint64_t devlinks_iterator_generation; /* generation when iteration was started */
+ int devlink_priority;
+
+ int ifindex;
+ char *devtype;
+ char *devname;
+ dev_t devnum;
+
+ char **properties_strv; /* the properties hashmap as a strv */
+ uint8_t *properties_nulstr; /* the same as a nulstr */
+ size_t properties_nulstr_len;
+
+ char *syspath;
+ const char *devpath;
+ const char *sysnum;
+ char *sysname;
+
+ char *subsystem;
+ char *driver_subsystem; /* only set for the 'drivers' subsystem */
+ char *driver;
+
+ char *id_filename;
+
+ uint64_t usec_initialized;
+
+ mode_t devmode;
+ uid_t devuid;
+ gid_t devgid;
+
+ /* only set when device is passed through netlink */
+ DeviceAction action;
+ uint64_t seqnum;
+
+ bool parent_set:1; /* no need to try to reload parent */
+ bool sysattrs_read:1; /* don't try to re-read sysattrs once read */
+ bool property_tags_outdated:1; /* need to update TAGS= or CURRENT_TAGS= property */
+ bool property_devlinks_outdated:1; /* need to update DEVLINKS= property */
+ bool properties_buf_outdated:1; /* need to reread hashmap */
+ bool sysname_set:1; /* don't reread sysname */
+ bool subsystem_set:1; /* don't reread subsystem */
+ bool driver_subsystem_set:1; /* don't reread subsystem */
+ bool driver_set:1; /* don't reread driver */
+ bool uevent_loaded:1; /* don't reread uevent */
+ bool db_loaded; /* don't reread db */
+
+ bool is_initialized:1;
+ bool sealed:1; /* don't read more information from uevent/db */
+ bool db_persist:1; /* don't clean up the db when switching from initrd to real root */
+};
+
+int device_new_aux(sd_device **ret);
+int device_add_property_aux(sd_device *device, const char *key, const char *value, bool db);
+static inline int device_add_property_internal(sd_device *device, const char *key, const char *value) {
+ return device_add_property_aux(device, key, value, false);
+}
+int device_read_uevent_file(sd_device *device);
+
+int device_set_syspath(sd_device *device, const char *_syspath, bool verify);
+int device_set_ifindex(sd_device *device, const char *ifindex);
+int device_set_devmode(sd_device *device, const char *devmode);
+int device_set_devname(sd_device *device, const char *devname);
+int device_set_devtype(sd_device *device, const char *devtype);
+int device_set_devnum(sd_device *device, const char *major, const char *minor);
+int device_set_subsystem(sd_device *device, const char *_subsystem);
+int device_set_driver(sd_device *device, const char *_driver);
+int device_set_usec_initialized(sd_device *device, usec_t when);
diff --git a/src/libsystemd/sd-device/device-monitor-private.h b/src/libsystemd/sd-device/device-monitor-private.h
new file mode 100644
index 0000000..2ca3a31
--- /dev/null
+++ b/src/libsystemd/sd-device/device-monitor-private.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include "sd-device.h"
+
+typedef enum MonitorNetlinkGroup {
+ MONITOR_GROUP_NONE,
+ MONITOR_GROUP_KERNEL,
+ MONITOR_GROUP_UDEV,
+ _MONITOR_NETLINK_GROUP_MAX,
+ _MONITOR_NETLINK_GROUP_INVALID = -1,
+} MonitorNetlinkGroup;
+
+int device_monitor_new_full(sd_device_monitor **ret, MonitorNetlinkGroup group, int fd);
+int device_monitor_disconnect(sd_device_monitor *m);
+int device_monitor_allow_unicast_sender(sd_device_monitor *m, sd_device_monitor *sender);
+int device_monitor_enable_receiving(sd_device_monitor *m);
+int device_monitor_get_fd(sd_device_monitor *m);
+int device_monitor_send_device(sd_device_monitor *m, sd_device_monitor *destination, sd_device *device);
+int device_monitor_receive_device(sd_device_monitor *m, sd_device **ret);
diff --git a/src/libsystemd/sd-device/device-monitor.c b/src/libsystemd/sd-device/device-monitor.c
new file mode 100644
index 0000000..fd59007
--- /dev/null
+++ b/src/libsystemd/sd-device/device-monitor.c
@@ -0,0 +1,772 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <linux/filter.h>
+#include <linux/netlink.h>
+#include <linux/sockios.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+#include "sd-device.h"
+#include "sd-event.h"
+
+#include "MurmurHash2.h"
+#include "alloc-util.h"
+#include "device-monitor-private.h"
+#include "device-private.h"
+#include "device-util.h"
+#include "errno-util.h"
+#include "fd-util.h"
+#include "format-util.h"
+#include "hashmap.h"
+#include "io-util.h"
+#include "missing_socket.h"
+#include "mountpoint-util.h"
+#include "set.h"
+#include "socket-util.h"
+#include "string-util.h"
+#include "strv.h"
+
+struct sd_device_monitor {
+ unsigned n_ref;
+
+ int sock;
+ union sockaddr_union snl;
+ union sockaddr_union snl_trusted_sender;
+ bool bound;
+
+ Hashmap *subsystem_filter;
+ Set *tag_filter;
+ bool filter_uptodate;
+
+ sd_event *event;
+ sd_event_source *event_source;
+ sd_device_monitor_handler_t callback;
+ void *userdata;
+};
+
+#define UDEV_MONITOR_MAGIC 0xfeedcafe
+
+typedef struct monitor_netlink_header {
+ /* "libudev" prefix to distinguish libudev and kernel messages */
+ char prefix[8];
+ /* Magic to protect against daemon <-> Library message format mismatch
+ * Used in the kernel from socket filter rules; needs to be stored in network order */
+ unsigned magic;
+ /* Total length of header structure known to the sender */
+ unsigned header_size;
+ /* Properties string buffer */
+ unsigned properties_off;
+ unsigned properties_len;
+ /* Hashes of primary device properties strings, to let libudev subscribers
+ * use in-kernel socket filters; values need to be stored in network order */
+ unsigned filter_subsystem_hash;
+ unsigned filter_devtype_hash;
+ unsigned filter_tag_bloom_hi;
+ unsigned filter_tag_bloom_lo;
+} monitor_netlink_header;
+
+static int monitor_set_nl_address(sd_device_monitor *m) {
+ union sockaddr_union snl;
+ socklen_t addrlen;
+
+ assert(m);
+
+ /* Get the address the kernel has assigned us.
+ * It is usually, but not necessarily the pid. */
+ addrlen = sizeof(struct sockaddr_nl);
+ if (getsockname(m->sock, &snl.sa, &addrlen) < 0)
+ return -errno;
+
+ m->snl.nl.nl_pid = snl.nl.nl_pid;
+ return 0;
+}
+
+int device_monitor_allow_unicast_sender(sd_device_monitor *m, sd_device_monitor *sender) {
+ assert_return(m, -EINVAL);
+ assert_return(sender, -EINVAL);
+
+ m->snl_trusted_sender.nl.nl_pid = sender->snl.nl.nl_pid;
+ return 0;
+}
+
+_public_ int sd_device_monitor_set_receive_buffer_size(sd_device_monitor *m, size_t size) {
+ assert_return(m, -EINVAL);
+
+ return fd_set_rcvbuf(m->sock, size, false);
+}
+
+int device_monitor_disconnect(sd_device_monitor *m) {
+ assert(m);
+
+ m->sock = safe_close(m->sock);
+ return 0;
+}
+
+int device_monitor_get_fd(sd_device_monitor *m) {
+ assert_return(m, -EINVAL);
+
+ return m->sock;
+}
+
+int device_monitor_new_full(sd_device_monitor **ret, MonitorNetlinkGroup group, int fd) {
+ _cleanup_(sd_device_monitor_unrefp) sd_device_monitor *m = NULL;
+ _cleanup_close_ int sock = -1;
+ int r;
+
+ assert_return(ret, -EINVAL);
+ assert_return(group >= 0 && group < _MONITOR_NETLINK_GROUP_MAX, -EINVAL);
+
+ if (group == MONITOR_GROUP_UDEV &&
+ access("/run/udev/control", F_OK) < 0 &&
+ dev_is_devtmpfs() <= 0) {
+
+ /*
+ * We do not support subscribing to uevents if no instance of
+ * udev is running. Uevents would otherwise broadcast the
+ * processing data of the host into containers, which is not
+ * desired.
+ *
+ * Containers will currently not get any udev uevents, until
+ * a supporting infrastructure is available.
+ *
+ * We do not set a netlink multicast group here, so the socket
+ * will not receive any messages.
+ */
+
+ log_debug("sd-device-monitor: The udev service seems not to be active, disabling the monitor");
+ group = MONITOR_GROUP_NONE;
+ }
+
+ if (fd < 0) {
+ sock = socket(PF_NETLINK, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK, NETLINK_KOBJECT_UEVENT);
+ if (sock < 0)
+ return log_debug_errno(errno, "sd-device-monitor: Failed to create socket: %m");
+ }
+
+ m = new(sd_device_monitor, 1);
+ if (!m)
+ return -ENOMEM;
+
+ *m = (sd_device_monitor) {
+ .n_ref = 1,
+ .sock = fd >= 0 ? fd : TAKE_FD(sock),
+ .bound = fd >= 0,
+ .snl.nl.nl_family = AF_NETLINK,
+ .snl.nl.nl_groups = group,
+ };
+
+ if (fd >= 0) {
+ r = monitor_set_nl_address(m);
+ if (r < 0) {
+ log_debug_errno(r, "sd-device-monitor: Failed to set netlink address: %m");
+ goto fail;
+ }
+ }
+
+ if (DEBUG_LOGGING) {
+ _cleanup_close_ int netns = -1;
+
+ /* So here's the thing: only AF_NETLINK sockets from the main network namespace will get
+ * hardware events. Let's check if ours is from there, and if not generate a debug message,
+ * since we cannot possibly work correctly otherwise. This is just a safety check to make
+ * things easier to debug. */
+
+ netns = ioctl(m->sock, SIOCGSKNS);
+ if (netns < 0)
+ log_debug_errno(errno, "sd-device-monitor: Unable to get network namespace of udev netlink socket, unable to determine if we are in host netns: %m");
+ else {
+ struct stat a, b;
+
+ if (fstat(netns, &a) < 0) {
+ r = log_debug_errno(errno, "sd-device-monitor: Failed to stat netns of udev netlink socket: %m");
+ goto fail;
+ }
+
+ if (stat("/proc/1/ns/net", &b) < 0) {
+ if (ERRNO_IS_PRIVILEGE(errno))
+ /* If we can't access PID1's netns info due to permissions, it's fine, this is a
+ * safety check only after all. */
+ log_debug_errno(errno, "sd-device-monitor: No permission to stat PID1's netns, unable to determine if we are in host netns: %m");
+ else
+ log_debug_errno(errno, "sd-device-monitor: Failed to stat PID1's netns: %m");
+
+ } else if (a.st_dev != b.st_dev || a.st_ino != b.st_ino)
+ log_debug("sd-device-monitor: Netlink socket we listen on is not from host netns, we won't see device events.");
+ }
+ }
+
+ *ret = TAKE_PTR(m);
+ return 0;
+
+fail:
+ /* Let's unset the socket fd in the monitor object before we destroy it so that the fd passed in is
+ * not closed on failure. */
+ if (fd >= 0)
+ m->sock = -1;
+
+ return r;
+}
+
+_public_ int sd_device_monitor_new(sd_device_monitor **ret) {
+ return device_monitor_new_full(ret, MONITOR_GROUP_UDEV, -1);
+}
+
+_public_ int sd_device_monitor_stop(sd_device_monitor *m) {
+ assert_return(m, -EINVAL);
+
+ m->event_source = sd_event_source_unref(m->event_source);
+ (void) device_monitor_disconnect(m);
+
+ return 0;
+}
+
+static int device_monitor_event_handler(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
+ _cleanup_(sd_device_unrefp) sd_device *device = NULL;
+ sd_device_monitor *m = userdata;
+
+ assert(m);
+
+ if (device_monitor_receive_device(m, &device) <= 0)
+ return 0;
+
+ if (m->callback)
+ return m->callback(m, device, m->userdata);
+
+ return 0;
+}
+
+_public_ int sd_device_monitor_start(sd_device_monitor *m, sd_device_monitor_handler_t callback, void *userdata) {
+ int r;
+
+ assert_return(m, -EINVAL);
+
+ if (!m->event) {
+ r = sd_device_monitor_attach_event(m, NULL);
+ if (r < 0)
+ return r;
+ }
+
+ r = device_monitor_enable_receiving(m);
+ if (r < 0)
+ return r;
+
+ m->callback = callback;
+ m->userdata = userdata;
+
+ r = sd_event_add_io(m->event, &m->event_source, m->sock, EPOLLIN, device_monitor_event_handler, m);
+ if (r < 0)
+ return r;
+
+ (void) sd_event_source_set_description(m->event_source, "sd-device-monitor");
+
+ return 0;
+}
+
+_public_ int sd_device_monitor_detach_event(sd_device_monitor *m) {
+ assert_return(m, -EINVAL);
+
+ (void) sd_device_monitor_stop(m);
+ m->event = sd_event_unref(m->event);
+
+ return 0;
+}
+
+_public_ int sd_device_monitor_attach_event(sd_device_monitor *m, sd_event *event) {
+ int r;
+
+ assert_return(m, -EINVAL);
+ assert_return(!m->event, -EBUSY);
+
+ if (event)
+ m->event = sd_event_ref(event);
+ else {
+ r = sd_event_default(&m->event);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+_public_ sd_event *sd_device_monitor_get_event(sd_device_monitor *m) {
+ assert_return(m, NULL);
+
+ return m->event;
+}
+
+_public_ sd_event_source *sd_device_monitor_get_event_source(sd_device_monitor *m) {
+ assert_return(m, NULL);
+
+ return m->event_source;
+}
+
+int device_monitor_enable_receiving(sd_device_monitor *m) {
+ int r;
+
+ assert_return(m, -EINVAL);
+
+ r = sd_device_monitor_filter_update(m);
+ if (r < 0)
+ return log_debug_errno(r, "sd-device-monitor: Failed to update filter: %m");
+
+ if (!m->bound) {
+ /* enable receiving of sender credentials */
+ r = setsockopt_int(m->sock, SOL_SOCKET, SO_PASSCRED, true);
+ if (r < 0)
+ return log_debug_errno(r, "sd-device-monitor: Failed to set socket option SO_PASSCRED: %m");
+
+ if (bind(m->sock, &m->snl.sa, sizeof(struct sockaddr_nl)) < 0)
+ return log_debug_errno(errno, "sd-device-monitor: Failed to bind monitoring socket: %m");
+
+ m->bound = true;
+
+ r = monitor_set_nl_address(m);
+ if (r < 0)
+ return log_debug_errno(r, "sd-device-monitor: Failed to set address: %m");
+ }
+
+ return 0;
+}
+
+static sd_device_monitor *device_monitor_free(sd_device_monitor *m) {
+ assert(m);
+
+ (void) sd_device_monitor_detach_event(m);
+
+ hashmap_free_free_free(m->subsystem_filter);
+ set_free_free(m->tag_filter);
+
+ return mfree(m);
+}
+
+DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_device_monitor, sd_device_monitor, device_monitor_free);
+
+static int passes_filter(sd_device_monitor *m, sd_device *device) {
+ const char *tag, *subsystem, *devtype, *s, *d = NULL;
+ int r;
+
+ assert_return(m, -EINVAL);
+ assert_return(device, -EINVAL);
+
+ if (hashmap_isempty(m->subsystem_filter))
+ goto tag;
+
+ r = sd_device_get_subsystem(device, &s);
+ if (r < 0)
+ return r;
+
+ r = sd_device_get_devtype(device, &d);
+ if (r < 0 && r != -ENOENT)
+ return r;
+
+ HASHMAP_FOREACH_KEY(devtype, subsystem, m->subsystem_filter) {
+ if (!streq(s, subsystem))
+ continue;
+
+ if (!devtype)
+ goto tag;
+
+ if (!d)
+ continue;
+
+ if (streq(d, devtype))
+ goto tag;
+ }
+
+ return 0;
+
+tag:
+ if (set_isempty(m->tag_filter))
+ return 1;
+
+ SET_FOREACH(tag, m->tag_filter)
+ if (sd_device_has_tag(device, tag) > 0)
+ return 1;
+
+ return 0;
+}
+
+int device_monitor_receive_device(sd_device_monitor *m, sd_device **ret) {
+ _cleanup_(sd_device_unrefp) sd_device *device = NULL;
+ union {
+ monitor_netlink_header nlh;
+ char raw[8192];
+ } buf;
+ struct iovec iov = {
+ .iov_base = &buf,
+ .iov_len = sizeof(buf)
+ };
+ CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct ucred))) control;
+ union sockaddr_union snl;
+ struct msghdr smsg = {
+ .msg_iov = &iov,
+ .msg_iovlen = 1,
+ .msg_control = &control,
+ .msg_controllen = sizeof(control),
+ .msg_name = &snl,
+ .msg_namelen = sizeof(snl),
+ };
+ struct cmsghdr *cmsg;
+ struct ucred *cred;
+ ssize_t buflen, bufpos;
+ bool is_initialized = false;
+ int r;
+
+ assert(ret);
+
+ buflen = recvmsg(m->sock, &smsg, 0);
+ if (buflen < 0) {
+ if (errno != EINTR)
+ log_debug_errno(errno, "sd-device-monitor: Failed to receive message: %m");
+ return -errno;
+ }
+
+ if (buflen < 32 || (smsg.msg_flags & MSG_TRUNC))
+ return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
+ "sd-device-monitor: Invalid message length.");
+
+ if (snl.nl.nl_groups == MONITOR_GROUP_NONE) {
+ /* unicast message, check if we trust the sender */
+ if (m->snl_trusted_sender.nl.nl_pid == 0 ||
+ snl.nl.nl_pid != m->snl_trusted_sender.nl.nl_pid)
+ return log_debug_errno(SYNTHETIC_ERRNO(EAGAIN),
+ "sd-device-monitor: Unicast netlink message ignored.");
+
+ } else if (snl.nl.nl_groups == MONITOR_GROUP_KERNEL) {
+ if (snl.nl.nl_pid > 0)
+ return log_debug_errno(SYNTHETIC_ERRNO(EAGAIN),
+ "sd-device-monitor: Multicast kernel netlink message from PID %"PRIu32" ignored.", snl.nl.nl_pid);
+ }
+
+ cmsg = CMSG_FIRSTHDR(&smsg);
+ if (!cmsg || cmsg->cmsg_type != SCM_CREDENTIALS)
+ return log_debug_errno(SYNTHETIC_ERRNO(EAGAIN),
+ "sd-device-monitor: No sender credentials received, message ignored.");
+
+ cred = (struct ucred*) CMSG_DATA(cmsg);
+ if (cred->uid != 0)
+ return log_debug_errno(SYNTHETIC_ERRNO(EAGAIN),
+ "sd-device-monitor: Sender uid="UID_FMT", message ignored.", cred->uid);
+
+ if (streq(buf.raw, "libudev")) {
+ /* udev message needs proper version magic */
+ if (buf.nlh.magic != htobe32(UDEV_MONITOR_MAGIC))
+ return log_debug_errno(SYNTHETIC_ERRNO(EAGAIN),
+ "sd-device-monitor: Invalid message signature (%x != %x)",
+ buf.nlh.magic, htobe32(UDEV_MONITOR_MAGIC));
+
+ if (buf.nlh.properties_off+32 > (size_t) buflen)
+ return log_debug_errno(SYNTHETIC_ERRNO(EAGAIN),
+ "sd-device-monitor: Invalid message length (%u > %zd)",
+ buf.nlh.properties_off+32, buflen);
+
+ bufpos = buf.nlh.properties_off;
+
+ /* devices received from udev are always initialized */
+ is_initialized = true;
+
+ } else {
+ /* kernel message with header */
+ bufpos = strlen(buf.raw) + 1;
+ if ((size_t) bufpos < sizeof("a@/d") || bufpos >= buflen)
+ return log_debug_errno(SYNTHETIC_ERRNO(EAGAIN),
+ "sd-device-monitor: Invalid message length");
+
+ /* check message header */
+ if (!strstr(buf.raw, "@/"))
+ return log_debug_errno(SYNTHETIC_ERRNO(EAGAIN),
+ "sd-device-monitor: Invalid message header");
+ }
+
+ r = device_new_from_nulstr(&device, (uint8_t*) &buf.raw[bufpos], buflen - bufpos);
+ if (r < 0)
+ return log_debug_errno(r, "sd-device-monitor: Failed to create device from received message: %m");
+
+ if (is_initialized)
+ device_set_is_initialized(device);
+
+ /* Skip device, if it does not pass the current filter */
+ r = passes_filter(m, device);
+ if (r < 0)
+ return log_device_debug_errno(device, r, "sd-device-monitor: Failed to check received device passing filter: %m");
+ if (r == 0)
+ log_device_debug(device, "sd-device-monitor: Received device does not pass filter, ignoring");
+ else
+ *ret = TAKE_PTR(device);
+
+ return r;
+}
+
+static uint32_t string_hash32(const char *str) {
+ return MurmurHash2(str, strlen(str), 0);
+}
+
+/* Get a bunch of bit numbers out of the hash, and set the bits in our bit field */
+static uint64_t string_bloom64(const char *str) {
+ uint64_t bits = 0;
+ uint32_t hash = string_hash32(str);
+
+ bits |= 1LLU << (hash & 63);
+ bits |= 1LLU << ((hash >> 6) & 63);
+ bits |= 1LLU << ((hash >> 12) & 63);
+ bits |= 1LLU << ((hash >> 18) & 63);
+ return bits;
+}
+
+int device_monitor_send_device(
+ sd_device_monitor *m,
+ sd_device_monitor *destination,
+ sd_device *device) {
+
+ monitor_netlink_header nlh = {
+ .prefix = "libudev",
+ .magic = htobe32(UDEV_MONITOR_MAGIC),
+ .header_size = sizeof nlh,
+ };
+ struct iovec iov[2] = {
+ { .iov_base = &nlh, .iov_len = sizeof nlh },
+ };
+ struct msghdr smsg = {
+ .msg_iov = iov,
+ .msg_iovlen = 2,
+ };
+ /* default destination for sending */
+ union sockaddr_union default_destination = {
+ .nl.nl_family = AF_NETLINK,
+ .nl.nl_groups = MONITOR_GROUP_UDEV,
+ };
+ uint64_t tag_bloom_bits;
+ const char *buf, *val;
+ ssize_t count;
+ size_t blen;
+ int r;
+
+ assert(m);
+ assert(device);
+
+ r = device_get_properties_nulstr(device, (const uint8_t **) &buf, &blen);
+ if (r < 0)
+ return log_device_debug_errno(device, r, "sd-device-monitor: Failed to get device properties: %m");
+ if (blen < 32)
+ log_device_debug_errno(device, SYNTHETIC_ERRNO(EINVAL),
+ "sd-device-monitor: Length of device property nulstr is too small to contain valid device information");
+
+ /* fill in versioned header */
+ r = sd_device_get_subsystem(device, &val);
+ if (r < 0)
+ return log_device_debug_errno(device, r, "sd-device-monitor: Failed to get device subsystem: %m");
+ nlh.filter_subsystem_hash = htobe32(string_hash32(val));
+
+ if (sd_device_get_devtype(device, &val) >= 0)
+ nlh.filter_devtype_hash = htobe32(string_hash32(val));
+
+ /* add tag bloom filter */
+ tag_bloom_bits = 0;
+ FOREACH_DEVICE_TAG(device, val)
+ tag_bloom_bits |= string_bloom64(val);
+
+ if (tag_bloom_bits > 0) {
+ nlh.filter_tag_bloom_hi = htobe32(tag_bloom_bits >> 32);
+ nlh.filter_tag_bloom_lo = htobe32(tag_bloom_bits & 0xffffffff);
+ }
+
+ /* add properties list */
+ nlh.properties_off = iov[0].iov_len;
+ nlh.properties_len = blen;
+ iov[1] = IOVEC_MAKE((char*) buf, blen);
+
+ /*
+ * Use custom address for target, or the default one.
+ *
+ * If we send to a multicast group, we will get
+ * ECONNREFUSED, which is expected.
+ */
+ smsg.msg_name = destination ? &destination->snl : &default_destination;
+ smsg.msg_namelen = sizeof(struct sockaddr_nl);
+ count = sendmsg(m->sock, &smsg, 0);
+ if (count < 0) {
+ if (!destination && errno == ECONNREFUSED) {
+ log_device_debug(device, "sd-device-monitor: Passed to netlink monitor");
+ return 0;
+ } else
+ return log_device_debug_errno(device, errno, "sd-device-monitor: Failed to send device to netlink monitor: %m");
+ }
+
+ log_device_debug(device, "sd-device-monitor: Passed %zi byte to netlink monitor", count);
+ return count;
+}
+
+static void bpf_stmt(struct sock_filter *ins, unsigned *i,
+ unsigned short code, unsigned data) {
+ ins[(*i)++] = (struct sock_filter) {
+ .code = code,
+ .k = data,
+ };
+}
+
+static void bpf_jmp(struct sock_filter *ins, unsigned *i,
+ unsigned short code, unsigned data,
+ unsigned short jt, unsigned short jf) {
+ ins[(*i)++] = (struct sock_filter) {
+ .code = code,
+ .jt = jt,
+ .jf = jf,
+ .k = data,
+ };
+}
+
+_public_ int sd_device_monitor_filter_update(sd_device_monitor *m) {
+ struct sock_filter ins[512] = {};
+ struct sock_fprog filter;
+ const char *subsystem, *devtype, *tag;
+ unsigned i = 0;
+
+ assert_return(m, -EINVAL);
+
+ if (m->filter_uptodate)
+ return 0;
+
+ if (hashmap_isempty(m->subsystem_filter) &&
+ set_isempty(m->tag_filter)) {
+ m->filter_uptodate = true;
+ return 0;
+ }
+
+ /* load magic in A */
+ bpf_stmt(ins, &i, BPF_LD|BPF_W|BPF_ABS, offsetof(monitor_netlink_header, magic));
+ /* jump if magic matches */
+ bpf_jmp(ins, &i, BPF_JMP|BPF_JEQ|BPF_K, UDEV_MONITOR_MAGIC, 1, 0);
+ /* wrong magic, pass packet */
+ bpf_stmt(ins, &i, BPF_RET|BPF_K, 0xffffffff);
+
+ if (!set_isempty(m->tag_filter)) {
+ int tag_matches = set_size(m->tag_filter);
+
+ /* add all tags matches */
+ SET_FOREACH(tag, m->tag_filter) {
+ uint64_t tag_bloom_bits = string_bloom64(tag);
+ uint32_t tag_bloom_hi = tag_bloom_bits >> 32;
+ uint32_t tag_bloom_lo = tag_bloom_bits & 0xffffffff;
+
+ /* load device bloom bits in A */
+ bpf_stmt(ins, &i, BPF_LD|BPF_W|BPF_ABS, offsetof(monitor_netlink_header, filter_tag_bloom_hi));
+ /* clear bits (tag bits & bloom bits) */
+ bpf_stmt(ins, &i, BPF_ALU|BPF_AND|BPF_K, tag_bloom_hi);
+ /* jump to next tag if it does not match */
+ bpf_jmp(ins, &i, BPF_JMP|BPF_JEQ|BPF_K, tag_bloom_hi, 0, 3);
+
+ /* load device bloom bits in A */
+ bpf_stmt(ins, &i, BPF_LD|BPF_W|BPF_ABS, offsetof(monitor_netlink_header, filter_tag_bloom_lo));
+ /* clear bits (tag bits & bloom bits) */
+ bpf_stmt(ins, &i, BPF_ALU|BPF_AND|BPF_K, tag_bloom_lo);
+ /* jump behind end of tag match block if tag matches */
+ tag_matches--;
+ bpf_jmp(ins, &i, BPF_JMP|BPF_JEQ|BPF_K, tag_bloom_lo, 1 + (tag_matches * 6), 0);
+ }
+
+ /* nothing matched, drop packet */
+ bpf_stmt(ins, &i, BPF_RET|BPF_K, 0);
+ }
+
+ /* add all subsystem matches */
+ if (!hashmap_isempty(m->subsystem_filter)) {
+ HASHMAP_FOREACH_KEY(devtype, subsystem, m->subsystem_filter) {
+ uint32_t hash = string_hash32(subsystem);
+
+ /* load device subsystem value in A */
+ bpf_stmt(ins, &i, BPF_LD|BPF_W|BPF_ABS, offsetof(monitor_netlink_header, filter_subsystem_hash));
+ if (!devtype) {
+ /* jump if subsystem does not match */
+ bpf_jmp(ins, &i, BPF_JMP|BPF_JEQ|BPF_K, hash, 0, 1);
+ } else {
+ /* jump if subsystem does not match */
+ bpf_jmp(ins, &i, BPF_JMP|BPF_JEQ|BPF_K, hash, 0, 3);
+ /* load device devtype value in A */
+ bpf_stmt(ins, &i, BPF_LD|BPF_W|BPF_ABS, offsetof(monitor_netlink_header, filter_devtype_hash));
+ /* jump if value does not match */
+ hash = string_hash32(devtype);
+ bpf_jmp(ins, &i, BPF_JMP|BPF_JEQ|BPF_K, hash, 0, 1);
+ }
+
+ /* matched, pass packet */
+ bpf_stmt(ins, &i, BPF_RET|BPF_K, 0xffffffff);
+
+ if (i+1 >= ELEMENTSOF(ins))
+ return -E2BIG;
+ }
+
+ /* nothing matched, drop packet */
+ bpf_stmt(ins, &i, BPF_RET|BPF_K, 0);
+ }
+
+ /* matched, pass packet */
+ bpf_stmt(ins, &i, BPF_RET|BPF_K, 0xffffffff);
+
+ /* install filter */
+ filter = (struct sock_fprog) {
+ .len = i,
+ .filter = ins,
+ };
+ if (setsockopt(m->sock, SOL_SOCKET, SO_ATTACH_FILTER, &filter, sizeof(filter)) < 0)
+ return -errno;
+
+ m->filter_uptodate = true;
+ return 0;
+}
+
+_public_ int sd_device_monitor_filter_add_match_subsystem_devtype(sd_device_monitor *m, const char *subsystem, const char *devtype) {
+ _cleanup_free_ char *s = NULL, *d = NULL;
+ int r;
+
+ assert_return(m, -EINVAL);
+ assert_return(subsystem, -EINVAL);
+
+ s = strdup(subsystem);
+ if (!s)
+ return -ENOMEM;
+
+ if (devtype) {
+ d = strdup(devtype);
+ if (!d)
+ return -ENOMEM;
+ }
+
+ r = hashmap_ensure_allocated(&m->subsystem_filter, NULL);
+ if (r < 0)
+ return r;
+
+ r = hashmap_put(m->subsystem_filter, s, d);
+ if (r < 0)
+ return r;
+
+ s = d = NULL;
+ m->filter_uptodate = false;
+
+ return 0;
+}
+
+_public_ int sd_device_monitor_filter_add_match_tag(sd_device_monitor *m, const char *tag) {
+ assert_return(m, -EINVAL);
+ assert_return(tag, -EINVAL);
+
+ int r = set_put_strdup(&m->tag_filter, tag);
+ if (r > 0)
+ m->filter_uptodate = false;
+ return r;
+}
+
+_public_ int sd_device_monitor_filter_remove(sd_device_monitor *m) {
+ static const struct sock_fprog filter = { 0, NULL };
+
+ assert_return(m, -EINVAL);
+
+ m->subsystem_filter = hashmap_free_free_free(m->subsystem_filter);
+ m->tag_filter = set_free_free(m->tag_filter);
+
+ if (setsockopt(m->sock, SOL_SOCKET, SO_DETACH_FILTER, &filter, sizeof(filter)) < 0)
+ return -errno;
+
+ m->filter_uptodate = true;
+ return 0;
+}
diff --git a/src/libsystemd/sd-device/device-private.c b/src/libsystemd/sd-device/device-private.c
new file mode 100644
index 0000000..9070dfb
--- /dev/null
+++ b/src/libsystemd/sd-device/device-private.c
@@ -0,0 +1,1017 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <ctype.h>
+#include <net/if.h>
+#include <sys/types.h>
+
+#include "sd-device.h"
+
+#include "alloc-util.h"
+#include "device-internal.h"
+#include "device-private.h"
+#include "device-util.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fs-util.h"
+#include "hashmap.h"
+#include "macro.h"
+#include "mkdir.h"
+#include "nulstr-util.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "set.h"
+#include "string-table.h"
+#include "string-util.h"
+#include "strv.h"
+#include "strxcpyx.h"
+#include "tmpfile-util.h"
+#include "user-util.h"
+
+int device_add_property(sd_device *device, const char *key, const char *value) {
+ int r;
+
+ assert(device);
+ assert(key);
+
+ r = device_add_property_aux(device, key, value, false);
+ if (r < 0)
+ return r;
+
+ if (key[0] != '.') {
+ r = device_add_property_aux(device, key, value, true);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+void device_set_devlink_priority(sd_device *device, int priority) {
+ assert(device);
+
+ device->devlink_priority = priority;
+}
+
+void device_set_is_initialized(sd_device *device) {
+ assert(device);
+
+ device->is_initialized = true;
+}
+
+int device_ensure_usec_initialized(sd_device *device, sd_device *device_old) {
+ usec_t when;
+
+ assert(device);
+
+ if (device_old && device_old->usec_initialized > 0)
+ when = device_old->usec_initialized;
+ else
+ when = now(CLOCK_MONOTONIC);
+
+ return device_set_usec_initialized(device, when);
+}
+
+uint64_t device_get_properties_generation(sd_device *device) {
+ assert(device);
+
+ return device->properties_generation;
+}
+
+uint64_t device_get_tags_generation(sd_device *device) {
+ assert(device);
+
+ return device->tags_generation;
+}
+
+uint64_t device_get_devlinks_generation(sd_device *device) {
+ assert(device);
+
+ return device->devlinks_generation;
+}
+
+int device_get_devnode_mode(sd_device *device, mode_t *mode) {
+ int r;
+
+ assert(device);
+
+ r = device_read_db(device);
+ if (r < 0)
+ return r;
+
+ if (device->devmode == (mode_t) -1)
+ return -ENOENT;
+
+ if (mode)
+ *mode = device->devmode;
+
+ return 0;
+}
+
+int device_get_devnode_uid(sd_device *device, uid_t *uid) {
+ int r;
+
+ assert(device);
+
+ r = device_read_db(device);
+ if (r < 0)
+ return r;
+
+ if (device->devuid == (uid_t) -1)
+ return -ENOENT;
+
+ if (uid)
+ *uid = device->devuid;
+
+ return 0;
+}
+
+static int device_set_devuid(sd_device *device, const char *uid) {
+ unsigned u;
+ int r;
+
+ assert(device);
+ assert(uid);
+
+ r = safe_atou(uid, &u);
+ if (r < 0)
+ return r;
+
+ r = device_add_property_internal(device, "DEVUID", uid);
+ if (r < 0)
+ return r;
+
+ device->devuid = u;
+
+ return 0;
+}
+
+int device_get_devnode_gid(sd_device *device, gid_t *gid) {
+ int r;
+
+ assert(device);
+
+ r = device_read_db(device);
+ if (r < 0)
+ return r;
+
+ if (device->devgid == (gid_t) -1)
+ return -ENOENT;
+
+ if (gid)
+ *gid = device->devgid;
+
+ return 0;
+}
+
+static int device_set_devgid(sd_device *device, const char *gid) {
+ unsigned g;
+ int r;
+
+ assert(device);
+ assert(gid);
+
+ r = safe_atou(gid, &g);
+ if (r < 0)
+ return r;
+
+ r = device_add_property_internal(device, "DEVGID", gid);
+ if (r < 0)
+ return r;
+
+ device->devgid = g;
+
+ return 0;
+}
+
+int device_get_action(sd_device *device, DeviceAction *action) {
+ assert(device);
+
+ if (device->action < 0)
+ return -ENOENT;
+
+ if (action)
+ *action = device->action;
+
+ return 0;
+}
+
+static int device_set_action(sd_device *device, const char *action) {
+ DeviceAction a;
+ int r;
+
+ assert(device);
+ assert(action);
+
+ a = device_action_from_string(action);
+ if (a < 0)
+ return -EINVAL;
+
+ r = device_add_property_internal(device, "ACTION", action);
+ if (r < 0)
+ return r;
+
+ device->action = a;
+
+ return 0;
+}
+
+int device_get_seqnum(sd_device *device, uint64_t *seqnum) {
+ assert(device);
+
+ if (device->seqnum == 0)
+ return -ENOENT;
+
+ if (seqnum)
+ *seqnum = device->seqnum;
+
+ return 0;
+}
+
+static int device_set_seqnum(sd_device *device, const char *str) {
+ uint64_t seqnum;
+ int r;
+
+ assert(device);
+ assert(str);
+
+ r = safe_atou64(str, &seqnum);
+ if (r < 0)
+ return r;
+ if (seqnum == 0)
+ return -EINVAL;
+
+ r = device_add_property_internal(device, "SEQNUM", str);
+ if (r < 0)
+ return r;
+
+ device->seqnum = seqnum;
+
+ return 0;
+}
+
+static int device_amend(sd_device *device, const char *key, const char *value) {
+ int r;
+
+ assert(device);
+ assert(key);
+ assert(value);
+
+ if (streq(key, "DEVPATH")) {
+ char *path;
+
+ path = strjoina("/sys", value);
+
+ /* the caller must verify or trust this data (e.g., if it comes from the kernel) */
+ r = device_set_syspath(device, path, false);
+ if (r < 0)
+ return log_device_debug_errno(device, r, "sd-device: Failed to set syspath to '%s': %m", path);
+ } else if (streq(key, "SUBSYSTEM")) {
+ r = device_set_subsystem(device, value);
+ if (r < 0)
+ return log_device_debug_errno(device, r, "sd-device: Failed to set subsystem to '%s': %m", value);
+ } else if (streq(key, "DEVTYPE")) {
+ r = device_set_devtype(device, value);
+ if (r < 0)
+ return log_device_debug_errno(device, r, "sd-device: Failed to set devtype to '%s': %m", value);
+ } else if (streq(key, "DEVNAME")) {
+ r = device_set_devname(device, value);
+ if (r < 0)
+ return log_device_debug_errno(device, r, "sd-device: Failed to set devname to '%s': %m", value);
+ } else if (streq(key, "USEC_INITIALIZED")) {
+ usec_t t;
+
+ r = safe_atou64(value, &t);
+ if (r < 0)
+ return log_device_debug_errno(device, r, "sd-device: Failed to parse timestamp '%s': %m", value);
+
+ r = device_set_usec_initialized(device, t);
+ if (r < 0)
+ return log_device_debug_errno(device, r, "sd-device: Failed to set usec-initialized to '%s': %m", value);
+ } else if (streq(key, "DRIVER")) {
+ r = device_set_driver(device, value);
+ if (r < 0)
+ return log_device_debug_errno(device, r, "sd-device: Failed to set driver to '%s': %m", value);
+ } else if (streq(key, "IFINDEX")) {
+ r = device_set_ifindex(device, value);
+ if (r < 0)
+ return log_device_debug_errno(device, r, "sd-device: Failed to set ifindex to '%s': %m", value);
+ } else if (streq(key, "DEVMODE")) {
+ r = device_set_devmode(device, value);
+ if (r < 0)
+ return log_device_debug_errno(device, r, "sd-device: Failed to set devmode to '%s': %m", value);
+ } else if (streq(key, "DEVUID")) {
+ r = device_set_devuid(device, value);
+ if (r < 0)
+ return log_device_debug_errno(device, r, "sd-device: Failed to set devuid to '%s': %m", value);
+ } else if (streq(key, "DEVGID")) {
+ r = device_set_devgid(device, value);
+ if (r < 0)
+ return log_device_debug_errno(device, r, "sd-device: Failed to set devgid to '%s': %m", value);
+ } else if (streq(key, "ACTION")) {
+ r = device_set_action(device, value);
+ if (r < 0)
+ return log_device_debug_errno(device, r, "sd-device: Failed to set action to '%s': %m", value);
+ } else if (streq(key, "SEQNUM")) {
+ r = device_set_seqnum(device, value);
+ if (r < 0)
+ return log_device_debug_errno(device, r, "sd-device: Failed to set SEQNUM to '%s': %m", value);
+ } else if (streq(key, "DEVLINKS")) {
+ for (const char *p = value;;) {
+ _cleanup_free_ char *word = NULL;
+
+ /* udev rules may set escaped strings, and sd-device does not modify the input
+ * strings. So, it is also necessary to keep the strings received through
+ * sd-device-monitor. */
+ r = extract_first_word(&p, &word, NULL, EXTRACT_RETAIN_ESCAPE);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ break;
+
+ r = device_add_devlink(device, word);
+ if (r < 0)
+ return log_device_debug_errno(device, r, "sd-device: Failed to add devlink '%s': %m", word);
+ }
+ } else if (STR_IN_SET(key, "TAGS", "CURRENT_TAGS")) {
+ for (const char *p = value;;) {
+ _cleanup_free_ char *word = NULL;
+
+ r = extract_first_word(&p, &word, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ break;
+
+ r = device_add_tag(device, word, streq(key, "CURRENT_TAGS"));
+ if (r < 0)
+ return log_device_debug_errno(device, r, "sd-device: Failed to add tag '%s': %m", word);
+ }
+ } else {
+ r = device_add_property_internal(device, key, value);
+ if (r < 0)
+ return log_device_debug_errno(device, r, "sd-device: Failed to add property '%s=%s': %m", key, value);
+ }
+
+ return 0;
+}
+
+static int device_append(sd_device *device, char *key, const char **_major, const char **_minor) {
+ const char *major = NULL, *minor = NULL;
+ char *value;
+ int r;
+
+ assert(device);
+ assert(key);
+ assert(_major);
+ assert(_minor);
+
+ value = strchr(key, '=');
+ if (!value)
+ return log_device_debug_errno(device, SYNTHETIC_ERRNO(EINVAL),
+ "sd-device: Not a key-value pair: '%s'", key);
+
+ *value = '\0';
+
+ value++;
+
+ if (streq(key, "MAJOR"))
+ major = value;
+ else if (streq(key, "MINOR"))
+ minor = value;
+ else {
+ r = device_amend(device, key, value);
+ if (r < 0)
+ return r;
+ }
+
+ if (major != 0)
+ *_major = major;
+
+ if (minor != 0)
+ *_minor = minor;
+
+ return 0;
+}
+
+void device_seal(sd_device *device) {
+ assert(device);
+
+ device->sealed = true;
+}
+
+static int device_verify(sd_device *device) {
+ assert(device);
+
+ if (!device->devpath || !device->subsystem || device->action < 0 || device->seqnum == 0)
+ return log_device_debug_errno(device, SYNTHETIC_ERRNO(EINVAL),
+ "sd-device: Device created from strv or nulstr lacks devpath, subsystem, action or seqnum.");
+
+ device->sealed = true;
+
+ return 0;
+}
+
+int device_new_from_strv(sd_device **ret, char **strv) {
+ _cleanup_(sd_device_unrefp) sd_device *device = NULL;
+ char **key;
+ const char *major = NULL, *minor = NULL;
+ int r;
+
+ assert(ret);
+ assert(strv);
+
+ r = device_new_aux(&device);
+ if (r < 0)
+ return r;
+
+ STRV_FOREACH(key, strv) {
+ r = device_append(device, *key, &major, &minor);
+ if (r < 0)
+ return r;
+ }
+
+ if (major) {
+ r = device_set_devnum(device, major, minor);
+ if (r < 0)
+ return log_device_debug_errno(device, r, "sd-device: Failed to set devnum %s:%s: %m", major, minor);
+ }
+
+ r = device_verify(device);
+ if (r < 0)
+ return r;
+
+ *ret = TAKE_PTR(device);
+
+ return 0;
+}
+
+int device_new_from_nulstr(sd_device **ret, uint8_t *nulstr, size_t len) {
+ _cleanup_(sd_device_unrefp) sd_device *device = NULL;
+ const char *major = NULL, *minor = NULL;
+ unsigned i = 0;
+ int r;
+
+ assert(ret);
+ assert(nulstr);
+ assert(len);
+
+ r = device_new_aux(&device);
+ if (r < 0)
+ return r;
+
+ while (i < len) {
+ char *key;
+ const char *end;
+
+ key = (char*)&nulstr[i];
+ end = memchr(key, '\0', len - i);
+ if (!end)
+ return log_device_debug_errno(device, SYNTHETIC_ERRNO(EINVAL),
+ "sd-device: Failed to parse nulstr");
+
+ i += end - key + 1;
+
+ /* netlink messages for some devices contain an unwanted newline at the end of value.
+ * Let's drop the newline and remaining characters after the newline. */
+ truncate_nl(key);
+
+ r = device_append(device, key, &major, &minor);
+ if (r < 0)
+ return r;
+ }
+
+ if (major) {
+ r = device_set_devnum(device, major, minor);
+ if (r < 0)
+ return log_device_debug_errno(device, r, "sd-device: Failed to set devnum %s:%s: %m", major, minor);
+ }
+
+ r = device_verify(device);
+ if (r < 0)
+ return r;
+
+ *ret = TAKE_PTR(device);
+
+ return 0;
+}
+
+static int device_update_properties_bufs(sd_device *device) {
+ const char *val, *prop;
+ _cleanup_free_ char **buf_strv = NULL;
+ _cleanup_free_ uint8_t *buf_nulstr = NULL;
+ size_t allocated_nulstr = 0;
+ size_t nulstr_len = 0, num = 0, i = 0;
+
+ assert(device);
+
+ if (!device->properties_buf_outdated)
+ return 0;
+
+ FOREACH_DEVICE_PROPERTY(device, prop, val) {
+ size_t len = 0;
+
+ len = strlen(prop) + 1 + strlen(val);
+
+ buf_nulstr = GREEDY_REALLOC0(buf_nulstr, allocated_nulstr, nulstr_len + len + 2);
+ if (!buf_nulstr)
+ return -ENOMEM;
+
+ strscpyl((char *)buf_nulstr + nulstr_len, len + 1, prop, "=", val, NULL);
+ nulstr_len += len + 1;
+ ++num;
+ }
+
+ /* build buf_strv from buf_nulstr */
+ buf_strv = new0(char *, num + 1);
+ if (!buf_strv)
+ return -ENOMEM;
+
+ NULSTR_FOREACH(val, (char*) buf_nulstr) {
+ buf_strv[i] = (char *) val;
+ assert(i < num);
+ i++;
+ }
+
+ free_and_replace(device->properties_nulstr, buf_nulstr);
+ device->properties_nulstr_len = nulstr_len;
+ free_and_replace(device->properties_strv, buf_strv);
+
+ device->properties_buf_outdated = false;
+
+ return 0;
+}
+
+int device_get_properties_nulstr(sd_device *device, const uint8_t **nulstr, size_t *len) {
+ int r;
+
+ assert(device);
+ assert(nulstr);
+ assert(len);
+
+ r = device_update_properties_bufs(device);
+ if (r < 0)
+ return r;
+
+ *nulstr = device->properties_nulstr;
+ *len = device->properties_nulstr_len;
+
+ return 0;
+}
+
+int device_get_properties_strv(sd_device *device, char ***strv) {
+ int r;
+
+ assert(device);
+ assert(strv);
+
+ r = device_update_properties_bufs(device);
+ if (r < 0)
+ return r;
+
+ *strv = device->properties_strv;
+
+ return 0;
+}
+
+int device_get_devlink_priority(sd_device *device, int *priority) {
+ int r;
+
+ assert(device);
+ assert(priority);
+
+ r = device_read_db(device);
+ if (r < 0)
+ return r;
+
+ *priority = device->devlink_priority;
+
+ return 0;
+}
+
+int device_get_watch_handle(sd_device *device, int *handle) {
+ int r;
+
+ assert(device);
+
+ r = device_read_db(device);
+ if (r < 0)
+ return r;
+
+ if (device->watch_handle < 0)
+ return -ENOENT;
+
+ if (handle)
+ *handle = device->watch_handle;
+
+ return 0;
+}
+
+void device_set_watch_handle(sd_device *device, int handle) {
+ assert(device);
+
+ device->watch_handle = handle;
+}
+
+int device_rename(sd_device *device, const char *name) {
+ _cleanup_free_ char *dirname = NULL;
+ const char *new_syspath, *interface;
+ int r;
+
+ assert(device);
+ assert(name);
+
+ dirname = dirname_malloc(device->syspath);
+ if (!dirname)
+ return -ENOMEM;
+
+ new_syspath = prefix_roota(dirname, name);
+
+ /* the user must trust that the new name is correct */
+ r = device_set_syspath(device, new_syspath, false);
+ if (r < 0)
+ return r;
+
+ r = sd_device_get_property_value(device, "INTERFACE", &interface);
+ if (r >= 0) {
+ /* like DEVPATH_OLD, INTERFACE_OLD is not saved to the db, but only stays around for the current event */
+ r = device_add_property_internal(device, "INTERFACE_OLD", interface);
+ if (r < 0)
+ return r;
+
+ r = device_add_property_internal(device, "INTERFACE", name);
+ if (r < 0)
+ return r;
+ } else if (r != -ENOENT)
+ return r;
+
+ return 0;
+}
+
+int device_shallow_clone(sd_device *old_device, sd_device **new_device) {
+ _cleanup_(sd_device_unrefp) sd_device *ret = NULL;
+ int r;
+
+ assert(old_device);
+ assert(new_device);
+
+ r = device_new_aux(&ret);
+ if (r < 0)
+ return r;
+
+ r = device_set_syspath(ret, old_device->syspath, false);
+ if (r < 0)
+ return r;
+
+ r = device_set_subsystem(ret, old_device->subsystem);
+ if (r < 0)
+ return r;
+
+ ret->devnum = old_device->devnum;
+
+ *new_device = TAKE_PTR(ret);
+
+ return 0;
+}
+
+int device_clone_with_db(sd_device *old_device, sd_device **new_device) {
+ _cleanup_(sd_device_unrefp) sd_device *ret = NULL;
+ int r;
+
+ assert(old_device);
+ assert(new_device);
+
+ r = device_shallow_clone(old_device, &ret);
+ if (r < 0)
+ return r;
+
+ r = device_read_db(ret);
+ if (r < 0)
+ return r;
+
+ ret->sealed = true;
+
+ *new_device = TAKE_PTR(ret);
+
+ return 0;
+}
+
+int device_new_from_synthetic_event(sd_device **new_device, const char *syspath, const char *action) {
+ _cleanup_(sd_device_unrefp) sd_device *ret = NULL;
+ int r;
+
+ assert(new_device);
+ assert(syspath);
+ assert(action);
+
+ r = sd_device_new_from_syspath(&ret, syspath);
+ if (r < 0)
+ return r;
+
+ r = device_read_uevent_file(ret);
+ if (r < 0)
+ return r;
+
+ r = device_set_action(ret, action);
+ if (r < 0)
+ return r;
+
+ *new_device = TAKE_PTR(ret);
+
+ return 0;
+}
+
+int device_new_from_stat_rdev(sd_device **ret, const struct stat *st) {
+ char type;
+
+ assert(ret);
+ assert(st);
+
+ if (S_ISBLK(st->st_mode))
+ type = 'b';
+ else if (S_ISCHR(st->st_mode))
+ type = 'c';
+ else
+ return -ENOTTY;
+
+ return sd_device_new_from_devnum(ret, type, st->st_rdev);
+}
+
+int device_copy_properties(sd_device *device_dst, sd_device *device_src) {
+ const char *property, *value;
+ int r;
+
+ assert(device_dst);
+ assert(device_src);
+
+ r = device_properties_prepare(device_src);
+ if (r < 0)
+ return r;
+
+ ORDERED_HASHMAP_FOREACH_KEY(value, property, device_src->properties_db) {
+ r = device_add_property_aux(device_dst, property, value, true);
+ if (r < 0)
+ return r;
+ }
+
+ ORDERED_HASHMAP_FOREACH_KEY(value, property, device_src->properties) {
+ r = device_add_property_aux(device_dst, property, value, false);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+void device_cleanup_tags(sd_device *device) {
+ assert(device);
+
+ device->all_tags = set_free_free(device->all_tags);
+ device->current_tags = set_free_free(device->current_tags);
+ device->property_tags_outdated = true;
+ device->tags_generation++;
+}
+
+void device_cleanup_devlinks(sd_device *device) {
+ assert(device);
+
+ set_free_free(device->devlinks);
+ device->devlinks = NULL;
+ device->property_devlinks_outdated = true;
+ device->devlinks_generation++;
+}
+
+void device_remove_tag(sd_device *device, const char *tag) {
+ assert(device);
+ assert(tag);
+
+ free(set_remove(device->current_tags, tag));
+ device->property_tags_outdated = true;
+ device->tags_generation++;
+}
+
+static int device_tag(sd_device *device, const char *tag, bool add) {
+ const char *id;
+ char *path;
+ int r;
+
+ assert(device);
+ assert(tag);
+
+ r = device_get_id_filename(device, &id);
+ if (r < 0)
+ return r;
+
+ path = strjoina("/run/udev/tags/", tag, "/", id);
+
+ if (add) {
+ r = touch_file(path, true, USEC_INFINITY, UID_INVALID, GID_INVALID, 0444);
+ if (r < 0)
+ return r;
+ } else {
+ r = unlink(path);
+ if (r < 0 && errno != ENOENT)
+ return -errno;
+ }
+
+ return 0;
+}
+
+int device_tag_index(sd_device *device, sd_device *device_old, bool add) {
+ const char *tag;
+ int r = 0, k;
+
+ if (add && device_old) {
+ /* delete possible left-over tags */
+ FOREACH_DEVICE_TAG(device_old, tag) {
+ if (!sd_device_has_tag(device, tag)) {
+ k = device_tag(device_old, tag, false);
+ if (r >= 0 && k < 0)
+ r = k;
+ }
+ }
+ }
+
+ FOREACH_DEVICE_TAG(device, tag) {
+ k = device_tag(device, tag, add);
+ if (r >= 0 && k < 0)
+ r = k;
+ }
+
+ return r;
+}
+
+static bool device_has_info(sd_device *device) {
+ assert(device);
+
+ if (!set_isempty(device->devlinks))
+ return true;
+
+ if (device->devlink_priority != 0)
+ return true;
+
+ if (!ordered_hashmap_isempty(device->properties_db))
+ return true;
+
+ if (!set_isempty(device->all_tags))
+ return true;
+
+ if (!set_isempty(device->current_tags))
+ return true;
+
+ if (device->watch_handle >= 0)
+ return true;
+
+ return false;
+}
+
+void device_set_db_persist(sd_device *device) {
+ assert(device);
+
+ device->db_persist = true;
+}
+
+int device_update_db(sd_device *device) {
+ const char *id;
+ char *path;
+ _cleanup_fclose_ FILE *f = NULL;
+ _cleanup_free_ char *path_tmp = NULL;
+ bool has_info;
+ int r;
+
+ assert(device);
+
+ has_info = device_has_info(device);
+
+ r = device_get_id_filename(device, &id);
+ if (r < 0)
+ return r;
+
+ path = strjoina("/run/udev/data/", id);
+
+ /* do not store anything for otherwise empty devices */
+ if (!has_info && major(device->devnum) == 0 && device->ifindex == 0) {
+ r = unlink(path);
+ if (r < 0 && errno != ENOENT)
+ return -errno;
+
+ return 0;
+ }
+
+ /* write a database file */
+ r = mkdir_parents(path, 0755);
+ if (r < 0)
+ return r;
+
+ r = fopen_temporary(path, &f, &path_tmp);
+ if (r < 0)
+ return r;
+
+ /*
+ * set 'sticky' bit to indicate that we should not clean the
+ * database when we transition from initramfs to the real root
+ */
+ if (device->db_persist) {
+ r = fchmod(fileno(f), 01644);
+ if (r < 0) {
+ r = -errno;
+ goto fail;
+ }
+ } else {
+ r = fchmod(fileno(f), 0644);
+ if (r < 0) {
+ r = -errno;
+ goto fail;
+ }
+ }
+
+ if (has_info) {
+ const char *property, *value, *tag;
+
+ if (major(device->devnum) > 0) {
+ const char *devlink;
+
+ FOREACH_DEVICE_DEVLINK(device, devlink)
+ fprintf(f, "S:%s\n", devlink + STRLEN("/dev/"));
+
+ if (device->devlink_priority != 0)
+ fprintf(f, "L:%i\n", device->devlink_priority);
+
+ if (device->watch_handle >= 0)
+ fprintf(f, "W:%i\n", device->watch_handle);
+ }
+
+ if (device->usec_initialized > 0)
+ fprintf(f, "I:"USEC_FMT"\n", device->usec_initialized);
+
+ ORDERED_HASHMAP_FOREACH_KEY(value, property, device->properties_db)
+ fprintf(f, "E:%s=%s\n", property, value);
+
+ FOREACH_DEVICE_TAG(device, tag)
+ fprintf(f, "G:%s\n", tag); /* Any tag */
+
+ SET_FOREACH(tag, device->current_tags)
+ fprintf(f, "Q:%s\n", tag); /* Current tag */
+
+ /* Always write the latest database version here, instead of the value stored in
+ * device->database_version, as which may be 0. */
+ fputs("V:" STRINGIFY(LATEST_UDEV_DATABASE_VERSION) "\n", f);
+ }
+
+ r = fflush_and_check(f);
+ if (r < 0)
+ goto fail;
+
+ r = rename(path_tmp, path);
+ if (r < 0) {
+ r = -errno;
+ goto fail;
+ }
+
+ log_device_debug(device, "sd-device: Created %s file '%s' for '%s'", has_info ? "db" : "empty",
+ path, device->devpath);
+
+ return 0;
+
+fail:
+ (void) unlink(path);
+ (void) unlink(path_tmp);
+
+ return log_device_debug_errno(device, r, "sd-device: Failed to create %s file '%s' for '%s'", has_info ? "db" : "empty", path, device->devpath);
+}
+
+int device_delete_db(sd_device *device) {
+ const char *id;
+ char *path;
+ int r;
+
+ assert(device);
+
+ r = device_get_id_filename(device, &id);
+ if (r < 0)
+ return r;
+
+ path = strjoina("/run/udev/data/", id);
+
+ r = unlink(path);
+ if (r < 0 && errno != ENOENT)
+ return -errno;
+
+ return 0;
+}
+
+static const char* const device_action_table[_DEVICE_ACTION_MAX] = {
+ [DEVICE_ACTION_ADD] = "add",
+ [DEVICE_ACTION_REMOVE] = "remove",
+ [DEVICE_ACTION_CHANGE] = "change",
+ [DEVICE_ACTION_MOVE] = "move",
+ [DEVICE_ACTION_ONLINE] = "online",
+ [DEVICE_ACTION_OFFLINE] = "offline",
+ [DEVICE_ACTION_BIND] = "bind",
+ [DEVICE_ACTION_UNBIND] = "unbind",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(device_action, DeviceAction);
+
+void dump_device_action_table(void) {
+ DUMP_STRING_TABLE(device_action, DeviceAction, _DEVICE_ACTION_MAX);
+}
diff --git a/src/libsystemd/sd-device/device-private.h b/src/libsystemd/sd-device/device-private.h
new file mode 100644
index 0000000..db81934
--- /dev/null
+++ b/src/libsystemd/sd-device/device-private.h
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include <inttypes.h>
+#include <stdbool.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "sd-device.h"
+
+#include "macro.h"
+
+typedef enum DeviceAction {
+ DEVICE_ACTION_ADD,
+ DEVICE_ACTION_REMOVE,
+ DEVICE_ACTION_CHANGE,
+ DEVICE_ACTION_MOVE,
+ DEVICE_ACTION_ONLINE,
+ DEVICE_ACTION_OFFLINE,
+ DEVICE_ACTION_BIND,
+ DEVICE_ACTION_UNBIND,
+ _DEVICE_ACTION_MAX,
+ _DEVICE_ACTION_INVALID = -1,
+} DeviceAction;
+
+int device_new_from_nulstr(sd_device **ret, uint8_t *nulstr, size_t len);
+int device_new_from_strv(sd_device **ret, char **strv);
+int device_new_from_stat_rdev(sd_device **ret, const struct stat *st);
+
+int device_get_id_filename(sd_device *device, const char **ret);
+
+int device_get_devlink_priority(sd_device *device, int *priority);
+int device_get_watch_handle(sd_device *device, int *handle);
+int device_get_devnode_mode(sd_device *device, mode_t *mode);
+int device_get_devnode_uid(sd_device *device, uid_t *uid);
+int device_get_devnode_gid(sd_device *device, gid_t *gid);
+int device_get_action(sd_device *device, DeviceAction *action);
+int device_get_seqnum(sd_device *device, uint64_t *seqnum);
+
+void device_seal(sd_device *device);
+void device_set_is_initialized(sd_device *device);
+void device_set_watch_handle(sd_device *device, int fd);
+void device_set_db_persist(sd_device *device);
+void device_set_devlink_priority(sd_device *device, int priority);
+int device_ensure_usec_initialized(sd_device *device, sd_device *device_old);
+int device_add_devlink(sd_device *device, const char *devlink);
+int device_add_property(sd_device *device, const char *property, const char *value);
+int device_add_tag(sd_device *device, const char *tag, bool both);
+void device_remove_tag(sd_device *device, const char *tag);
+void device_cleanup_tags(sd_device *device);
+void device_cleanup_devlinks(sd_device *device);
+
+uint64_t device_get_properties_generation(sd_device *device);
+uint64_t device_get_tags_generation(sd_device *device);
+uint64_t device_get_devlinks_generation(sd_device *device);
+
+int device_properties_prepare(sd_device *device);
+int device_get_properties_nulstr(sd_device *device, const uint8_t **nulstr, size_t *len);
+int device_get_properties_strv(sd_device *device, char ***strv);
+
+int device_rename(sd_device *device, const char *name);
+int device_shallow_clone(sd_device *old_device, sd_device **new_device);
+int device_clone_with_db(sd_device *old_device, sd_device **new_device);
+int device_copy_properties(sd_device *device_dst, sd_device *device_src);
+int device_new_from_synthetic_event(sd_device **new_device, const char *syspath, const char *action);
+
+int device_tag_index(sd_device *dev, sd_device *dev_old, bool add);
+int device_update_db(sd_device *device);
+int device_delete_db(sd_device *device);
+int device_read_db_internal_filename(sd_device *device, const char *filename); /* For fuzzer */
+int device_read_db_internal(sd_device *device, bool force);
+static inline int device_read_db(sd_device *device) {
+ return device_read_db_internal(device, false);
+}
+
+DeviceAction device_action_from_string(const char *s) _pure_;
+const char *device_action_to_string(DeviceAction a) _const_;
+void dump_device_action_table(void);
diff --git a/src/libsystemd/sd-device/device-util.h b/src/libsystemd/sd-device/device-util.h
new file mode 100644
index 0000000..1226209
--- /dev/null
+++ b/src/libsystemd/sd-device/device-util.h
@@ -0,0 +1,64 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#define FOREACH_DEVICE_PROPERTY(device, key, value) \
+ for (key = sd_device_get_property_first(device, &(value)); \
+ key; \
+ key = sd_device_get_property_next(device, &(value)))
+
+#define FOREACH_DEVICE_TAG(device, tag) \
+ for (tag = sd_device_get_tag_first(device); \
+ tag; \
+ tag = sd_device_get_tag_next(device))
+
+#define FOREACH_DEVICE_CURRENT_TAG(device, tag) \
+ for (tag = sd_device_get_current_tag_first(device); \
+ tag; \
+ tag = sd_device_get_current_tag_next(device))
+
+#define FOREACH_DEVICE_SYSATTR(device, attr) \
+ for (attr = sd_device_get_sysattr_first(device); \
+ attr; \
+ attr = sd_device_get_sysattr_next(device))
+
+#define FOREACH_DEVICE_DEVLINK(device, devlink) \
+ for (devlink = sd_device_get_devlink_first(device); \
+ devlink; \
+ devlink = sd_device_get_devlink_next(device))
+
+#define FOREACH_DEVICE(enumerator, device) \
+ for (device = sd_device_enumerator_get_device_first(enumerator); \
+ device; \
+ device = sd_device_enumerator_get_device_next(enumerator))
+
+#define FOREACH_SUBSYSTEM(enumerator, device) \
+ for (device = sd_device_enumerator_get_subsystem_first(enumerator); \
+ device; \
+ device = sd_device_enumerator_get_subsystem_next(enumerator))
+
+#define log_device_full_errno(device, level, error, ...) \
+ ({ \
+ const char *_sysname = NULL; \
+ sd_device *_d = (device); \
+ int _level = (level), _error = (error); \
+ \
+ if (_d && _unlikely_(log_get_max_level() >= LOG_PRI(_level))) \
+ (void) sd_device_get_sysname(_d, &_sysname); \
+ log_object_internal(_level, _error, PROJECT_FILE, __LINE__, __func__, \
+ _sysname ? "DEVICE=" : NULL, _sysname, \
+ NULL, NULL, __VA_ARGS__); \
+ })
+
+#define log_device_full(device, level, ...) (void) log_device_full_errno(device, level, 0, __VA_ARGS__)
+
+#define log_device_debug(device, ...) log_device_full_errno(device, LOG_DEBUG, 0, __VA_ARGS__)
+#define log_device_info(device, ...) log_device_full(device, LOG_INFO, __VA_ARGS__)
+#define log_device_notice(device, ...) log_device_full(device, LOG_NOTICE, __VA_ARGS__)
+#define log_device_warning(device, ...) log_device_full(device, LOG_WARNING, __VA_ARGS__)
+#define log_device_error(device, ...) log_device_full(device, LOG_ERR, __VA_ARGS__)
+
+#define log_device_debug_errno(device, error, ...) log_device_full_errno(device, LOG_DEBUG, error, __VA_ARGS__)
+#define log_device_info_errno(device, error, ...) log_device_full_errno(device, LOG_INFO, error, __VA_ARGS__)
+#define log_device_notice_errno(device, error, ...) log_device_full_errno(device, LOG_NOTICE, error, __VA_ARGS__)
+#define log_device_warning_errno(device, error, ...) log_device_full_errno(device, LOG_WARNING, error, __VA_ARGS__)
+#define log_device_error_errno(device, error, ...) log_device_full_errno(device, LOG_ERR, error, __VA_ARGS__)
diff --git a/src/libsystemd/sd-device/sd-device.c b/src/libsystemd/sd-device/sd-device.c
new file mode 100644
index 0000000..d1aa328
--- /dev/null
+++ b/src/libsystemd/sd-device/sd-device.c
@@ -0,0 +1,1996 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <ctype.h>
+#include <net/if.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+
+#include "sd-device.h"
+
+#include "alloc-util.h"
+#include "device-internal.h"
+#include "device-private.h"
+#include "device-util.h"
+#include "dirent-util.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fs-util.h"
+#include "hashmap.h"
+#include "macro.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "set.h"
+#include "socket-util.h"
+#include "stat-util.h"
+#include "stdio-util.h"
+#include "string-util.h"
+#include "strv.h"
+#include "strxcpyx.h"
+#include "util.h"
+
+int device_new_aux(sd_device **ret) {
+ sd_device *device;
+
+ assert(ret);
+
+ device = new(sd_device, 1);
+ if (!device)
+ return -ENOMEM;
+
+ *device = (sd_device) {
+ .n_ref = 1,
+ .watch_handle = -1,
+ .devmode = (mode_t) -1,
+ .devuid = (uid_t) -1,
+ .devgid = (gid_t) -1,
+ .action = _DEVICE_ACTION_INVALID,
+ };
+
+ *ret = device;
+ return 0;
+}
+
+static sd_device *device_free(sd_device *device) {
+ assert(device);
+
+ sd_device_unref(device->parent);
+ free(device->syspath);
+ free(device->sysname);
+ free(device->devtype);
+ free(device->devname);
+ free(device->subsystem);
+ free(device->driver_subsystem);
+ free(device->driver);
+ free(device->id_filename);
+ free(device->properties_strv);
+ free(device->properties_nulstr);
+
+ ordered_hashmap_free_free_free(device->properties);
+ ordered_hashmap_free_free_free(device->properties_db);
+ hashmap_free_free_free(device->sysattr_values);
+ set_free(device->sysattrs);
+ set_free(device->all_tags);
+ set_free(device->current_tags);
+ set_free(device->devlinks);
+
+ return mfree(device);
+}
+
+DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_device, sd_device, device_free);
+
+int device_add_property_aux(sd_device *device, const char *_key, const char *_value, bool db) {
+ OrderedHashmap **properties;
+
+ assert(device);
+ assert(_key);
+
+ if (db)
+ properties = &device->properties_db;
+ else
+ properties = &device->properties;
+
+ if (_value) {
+ _cleanup_free_ char *key = NULL, *value = NULL, *old_key = NULL, *old_value = NULL;
+ int r;
+
+ r = ordered_hashmap_ensure_allocated(properties, &string_hash_ops);
+ if (r < 0)
+ return r;
+
+ key = strdup(_key);
+ if (!key)
+ return -ENOMEM;
+
+ value = strdup(_value);
+ if (!value)
+ return -ENOMEM;
+
+ old_value = ordered_hashmap_get2(*properties, key, (void**) &old_key);
+
+ r = ordered_hashmap_replace(*properties, key, value);
+ if (r < 0)
+ return r;
+
+ key = NULL;
+ value = NULL;
+ } else {
+ _cleanup_free_ char *key = NULL;
+ _cleanup_free_ char *value = NULL;
+
+ value = ordered_hashmap_remove2(*properties, _key, (void**) &key);
+ }
+
+ if (!db) {
+ device->properties_generation++;
+ device->properties_buf_outdated = true;
+ }
+
+ return 0;
+}
+
+int device_set_syspath(sd_device *device, const char *_syspath, bool verify) {
+ _cleanup_free_ char *syspath = NULL;
+ const char *devpath;
+ int r;
+
+ assert(device);
+ assert(_syspath);
+
+ /* must be a subdirectory of /sys */
+ if (!path_startswith(_syspath, "/sys/"))
+ return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
+ "sd-device: Syspath '%s' is not a subdirectory of /sys",
+ _syspath);
+
+ if (verify) {
+ r = chase_symlinks(_syspath, NULL, 0, &syspath, NULL);
+ if (r == -ENOENT)
+ return -ENODEV; /* the device does not exist (any more?) */
+ if (r < 0)
+ return log_debug_errno(r, "sd-device: Failed to get target of '%s': %m", _syspath);
+
+ if (!path_startswith(syspath, "/sys")) {
+ _cleanup_free_ char *real_sys = NULL, *new_syspath = NULL;
+ char *p;
+
+ /* /sys is a symlink to somewhere sysfs is mounted on? In that case, we convert the path to real sysfs to "/sys". */
+ r = chase_symlinks("/sys", NULL, 0, &real_sys, NULL);
+ if (r < 0)
+ return log_debug_errno(r, "sd-device: Failed to chase symlink /sys: %m");
+
+ p = path_startswith(syspath, real_sys);
+ if (!p)
+ return log_debug_errno(SYNTHETIC_ERRNO(ENODEV),
+ "sd-device: Canonicalized path '%s' does not starts with sysfs mount point '%s'",
+ syspath, real_sys);
+
+ new_syspath = path_join("/sys", p);
+ if (!new_syspath)
+ return -ENOMEM;
+
+ free_and_replace(syspath, new_syspath);
+ path_simplify(syspath, false);
+ }
+
+ if (path_startswith(syspath, "/sys/devices/")) {
+ char *path;
+
+ /* all 'devices' require an 'uevent' file */
+ path = strjoina(syspath, "/uevent");
+ r = access(path, F_OK);
+ if (r < 0) {
+ if (errno == ENOENT)
+ /* this is not a valid device */
+ return -ENODEV;
+
+ return log_debug_errno(errno, "sd-device: %s does not have an uevent file: %m", syspath);
+ }
+ } else {
+ /* everything else just needs to be a directory */
+ if (!is_dir(syspath, false))
+ return -ENODEV;
+ }
+ } else {
+ syspath = strdup(_syspath);
+ if (!syspath)
+ return -ENOMEM;
+ }
+
+ devpath = syspath + STRLEN("/sys");
+
+ if (devpath[0] == '\0')
+ /* '/sys' alone is not a valid device path */
+ return -ENODEV;
+
+ r = device_add_property_internal(device, "DEVPATH", devpath);
+ if (r < 0)
+ return r;
+
+ free_and_replace(device->syspath, syspath);
+ device->devpath = devpath;
+ return 0;
+}
+
+_public_ int sd_device_new_from_syspath(sd_device **ret, const char *syspath) {
+ _cleanup_(sd_device_unrefp) sd_device *device = NULL;
+ int r;
+
+ assert_return(ret, -EINVAL);
+ assert_return(syspath, -EINVAL);
+
+ r = device_new_aux(&device);
+ if (r < 0)
+ return r;
+
+ r = device_set_syspath(device, syspath, true);
+ if (r < 0)
+ return r;
+
+ *ret = TAKE_PTR(device);
+ return 0;
+}
+
+_public_ int sd_device_new_from_devnum(sd_device **ret, char type, dev_t devnum) {
+ char *syspath;
+ char id[DECIMAL_STR_MAX(unsigned) * 2 + 1];
+
+ assert_return(ret, -EINVAL);
+ assert_return(IN_SET(type, 'b', 'c'), -EINVAL);
+
+ /* use /sys/dev/{block,char}/<maj>:<min> link */
+ xsprintf(id, "%u:%u", major(devnum), minor(devnum));
+
+ syspath = strjoina("/sys/dev/", (type == 'b' ? "block" : "char"), "/", id);
+
+ return sd_device_new_from_syspath(ret, syspath);
+}
+
+_public_ int sd_device_new_from_subsystem_sysname(sd_device **ret, const char *subsystem, const char *sysname) {
+ char *name, *syspath;
+ size_t len = 0;
+
+ assert_return(ret, -EINVAL);
+ assert_return(subsystem, -EINVAL);
+ assert_return(sysname, -EINVAL);
+
+ if (streq(subsystem, "subsystem")) {
+ syspath = strjoina("/sys/subsystem/", sysname);
+ if (access(syspath, F_OK) >= 0)
+ return sd_device_new_from_syspath(ret, syspath);
+
+ syspath = strjoina("/sys/bus/", sysname);
+ if (access(syspath, F_OK) >= 0)
+ return sd_device_new_from_syspath(ret, syspath);
+
+ syspath = strjoina("/sys/class/", sysname);
+ if (access(syspath, F_OK) >= 0)
+ return sd_device_new_from_syspath(ret, syspath);
+ } else if (streq(subsystem, "module")) {
+ syspath = strjoina("/sys/module/", sysname);
+ if (access(syspath, F_OK) >= 0)
+ return sd_device_new_from_syspath(ret, syspath);
+ } else if (streq(subsystem, "drivers")) {
+ char subsys[PATH_MAX];
+ char *driver;
+
+ strscpy(subsys, sizeof(subsys), sysname);
+ driver = strchr(subsys, ':');
+ if (driver) {
+ driver[0] = '\0';
+ driver++;
+
+ syspath = strjoina("/sys/subsystem/", subsys, "/drivers/", driver);
+ if (access(syspath, F_OK) >= 0)
+ return sd_device_new_from_syspath(ret, syspath);
+
+ syspath = strjoina("/sys/bus/", subsys, "/drivers/", driver);
+ if (access(syspath, F_OK) >= 0)
+ return sd_device_new_from_syspath(ret, syspath);
+ }
+ }
+
+ /* translate sysname back to sysfs filename */
+ name = strdupa(sysname);
+ while (name[len] != '\0') {
+ if (name[len] == '/')
+ name[len] = '!';
+
+ len++;
+ }
+
+ syspath = strjoina("/sys/subsystem/", subsystem, "/devices/", name);
+ if (access(syspath, F_OK) >= 0)
+ return sd_device_new_from_syspath(ret, syspath);
+
+ syspath = strjoina("/sys/bus/", subsystem, "/devices/", name);
+ if (access(syspath, F_OK) >= 0)
+ return sd_device_new_from_syspath(ret, syspath);
+
+ syspath = strjoina("/sys/class/", subsystem, "/", name);
+ if (access(syspath, F_OK) >= 0)
+ return sd_device_new_from_syspath(ret, syspath);
+
+ syspath = strjoina("/sys/firmware/", subsystem, "/", sysname);
+ if (access(syspath, F_OK) >= 0)
+ return sd_device_new_from_syspath(ret, syspath);
+
+ return -ENODEV;
+}
+
+int device_set_devtype(sd_device *device, const char *devtype) {
+ _cleanup_free_ char *t = NULL;
+ int r;
+
+ assert(device);
+ assert(devtype);
+
+ t = strdup(devtype);
+ if (!t)
+ return -ENOMEM;
+
+ r = device_add_property_internal(device, "DEVTYPE", t);
+ if (r < 0)
+ return r;
+
+ return free_and_replace(device->devtype, t);
+}
+
+int device_set_ifindex(sd_device *device, const char *name) {
+ int r, ifindex;
+
+ assert(device);
+ assert(name);
+
+ ifindex = parse_ifindex(name);
+ if (ifindex < 0)
+ return ifindex;
+
+ r = device_add_property_internal(device, "IFINDEX", name);
+ if (r < 0)
+ return r;
+
+ device->ifindex = ifindex;
+
+ return 0;
+}
+
+int device_set_devname(sd_device *device, const char *devname) {
+ _cleanup_free_ char *t = NULL;
+ int r;
+
+ assert(device);
+ assert(devname);
+
+ if (devname[0] != '/')
+ t = strjoin("/dev/", devname);
+ else
+ t = strdup(devname);
+ if (!t)
+ return -ENOMEM;
+
+ r = device_add_property_internal(device, "DEVNAME", t);
+ if (r < 0)
+ return r;
+
+ return free_and_replace(device->devname, t);
+}
+
+int device_set_devmode(sd_device *device, const char *_devmode) {
+ unsigned devmode;
+ int r;
+
+ assert(device);
+ assert(_devmode);
+
+ r = safe_atou(_devmode, &devmode);
+ if (r < 0)
+ return r;
+
+ if (devmode > 07777)
+ return -EINVAL;
+
+ r = device_add_property_internal(device, "DEVMODE", _devmode);
+ if (r < 0)
+ return r;
+
+ device->devmode = devmode;
+
+ return 0;
+}
+
+int device_set_devnum(sd_device *device, const char *major, const char *minor) {
+ unsigned maj = 0, min = 0;
+ int r;
+
+ assert(device);
+ assert(major);
+
+ r = safe_atou(major, &maj);
+ if (r < 0)
+ return r;
+ if (!maj)
+ return 0;
+
+ if (minor) {
+ r = safe_atou(minor, &min);
+ if (r < 0)
+ return r;
+ }
+
+ r = device_add_property_internal(device, "MAJOR", major);
+ if (r < 0)
+ return r;
+
+ if (minor) {
+ r = device_add_property_internal(device, "MINOR", minor);
+ if (r < 0)
+ return r;
+ }
+
+ device->devnum = makedev(maj, min);
+
+ return 0;
+}
+
+static int handle_uevent_line(sd_device *device, const char *key, const char *value, const char **major, const char **minor) {
+ int r;
+
+ assert(device);
+ assert(key);
+ assert(value);
+ assert(major);
+ assert(minor);
+
+ if (streq(key, "DEVTYPE")) {
+ r = device_set_devtype(device, value);
+ if (r < 0)
+ return r;
+ } else if (streq(key, "IFINDEX")) {
+ r = device_set_ifindex(device, value);
+ if (r < 0)
+ return r;
+ } else if (streq(key, "DEVNAME")) {
+ r = device_set_devname(device, value);
+ if (r < 0)
+ return r;
+ } else if (streq(key, "DEVMODE")) {
+ r = device_set_devmode(device, value);
+ if (r < 0)
+ return r;
+ } else if (streq(key, "MAJOR"))
+ *major = value;
+ else if (streq(key, "MINOR"))
+ *minor = value;
+ else {
+ r = device_add_property_internal(device, key, value);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+int device_read_uevent_file(sd_device *device) {
+ _cleanup_free_ char *uevent = NULL;
+ const char *syspath, *key = NULL, *value = NULL, *major = NULL, *minor = NULL;
+ char *path;
+ size_t uevent_len;
+ unsigned i;
+ int r;
+
+ enum {
+ PRE_KEY,
+ KEY,
+ PRE_VALUE,
+ VALUE,
+ INVALID_LINE,
+ } state = PRE_KEY;
+
+ assert(device);
+
+ if (device->uevent_loaded || device->sealed)
+ return 0;
+
+ r = sd_device_get_syspath(device, &syspath);
+ if (r < 0)
+ return r;
+
+ path = strjoina(syspath, "/uevent");
+
+ r = read_full_file(path, &uevent, &uevent_len);
+ if (r == -EACCES) {
+ /* empty uevent files may be write-only */
+ device->uevent_loaded = true;
+ return 0;
+ }
+ if (r == -ENOENT)
+ /* some devices may not have uevent files, see set_syspath() */
+ return 0;
+ if (r < 0)
+ return log_device_debug_errno(device, r, "sd-device: Failed to read uevent file '%s': %m", path);
+
+ device->uevent_loaded = true;
+
+ for (i = 0; i < uevent_len; i++)
+ switch (state) {
+ case PRE_KEY:
+ if (!strchr(NEWLINE, uevent[i])) {
+ key = &uevent[i];
+
+ state = KEY;
+ }
+
+ break;
+ case KEY:
+ if (uevent[i] == '=') {
+ uevent[i] = '\0';
+
+ state = PRE_VALUE;
+ } else if (strchr(NEWLINE, uevent[i])) {
+ uevent[i] = '\0';
+ log_device_debug(device, "sd-device: Invalid uevent line '%s', ignoring", key);
+
+ state = PRE_KEY;
+ }
+
+ break;
+ case PRE_VALUE:
+ value = &uevent[i];
+ state = VALUE;
+
+ _fallthrough_; /* to handle empty property */
+ case VALUE:
+ if (strchr(NEWLINE, uevent[i])) {
+ uevent[i] = '\0';
+
+ r = handle_uevent_line(device, key, value, &major, &minor);
+ if (r < 0)
+ log_device_debug_errno(device, r, "sd-device: Failed to handle uevent entry '%s=%s', ignoring: %m", key, value);
+
+ state = PRE_KEY;
+ }
+
+ break;
+ default:
+ assert_not_reached("Invalid state when parsing uevent file");
+ }
+
+ if (major) {
+ r = device_set_devnum(device, major, minor);
+ if (r < 0)
+ log_device_debug_errno(device, r, "sd-device: Failed to set 'MAJOR=%s' or 'MINOR=%s' from '%s', ignoring: %m", major, minor, path);
+ }
+
+ return 0;
+}
+
+_public_ int sd_device_get_ifindex(sd_device *device, int *ifindex) {
+ int r;
+
+ assert_return(device, -EINVAL);
+
+ r = device_read_uevent_file(device);
+ if (r < 0)
+ return r;
+
+ if (device->ifindex <= 0)
+ return -ENOENT;
+
+ if (ifindex)
+ *ifindex = device->ifindex;
+
+ return 0;
+}
+
+_public_ int sd_device_new_from_device_id(sd_device **ret, const char *id) {
+ int r;
+
+ assert_return(ret, -EINVAL);
+ assert_return(id, -EINVAL);
+
+ switch (id[0]) {
+ case 'b':
+ case 'c': {
+ dev_t devt;
+
+ if (isempty(id))
+ return -EINVAL;
+
+ r = parse_dev(id + 1, &devt);
+ if (r < 0)
+ return r;
+
+ return sd_device_new_from_devnum(ret, id[0], devt);
+ }
+
+ case 'n': {
+ _cleanup_(sd_device_unrefp) sd_device *device = NULL;
+ _cleanup_close_ int sk = -1;
+ struct ifreq ifr = {};
+ int ifindex;
+
+ r = ifr.ifr_ifindex = parse_ifindex(&id[1]);
+ if (r < 0)
+ return r;
+
+ sk = socket_ioctl_fd();
+ if (sk < 0)
+ return sk;
+
+ r = ioctl(sk, SIOCGIFNAME, &ifr);
+ if (r < 0)
+ return -errno;
+
+ r = sd_device_new_from_subsystem_sysname(&device, "net", ifr.ifr_name);
+ if (r < 0)
+ return r;
+
+ r = sd_device_get_ifindex(device, &ifindex);
+ if (r < 0)
+ return r;
+
+ /* this is racey, so we might end up with the wrong device */
+ if (ifr.ifr_ifindex != ifindex)
+ return -ENODEV;
+
+ *ret = TAKE_PTR(device);
+ return 0;
+ }
+
+ case '+': {
+ char subsys[PATH_MAX];
+ char *sysname;
+
+ (void) strscpy(subsys, sizeof(subsys), id + 1);
+ sysname = strchr(subsys, ':');
+ if (!sysname)
+ return -EINVAL;
+
+ sysname[0] = '\0';
+ sysname++;
+
+ return sd_device_new_from_subsystem_sysname(ret, subsys, sysname);
+ }
+
+ default:
+ return -EINVAL;
+ }
+}
+
+_public_ int sd_device_get_syspath(sd_device *device, const char **ret) {
+ assert_return(device, -EINVAL);
+ assert_return(ret, -EINVAL);
+
+ assert(path_startswith(device->syspath, "/sys/"));
+
+ *ret = device->syspath;
+
+ return 0;
+}
+
+static int device_new_from_child(sd_device **ret, sd_device *child) {
+ _cleanup_free_ char *path = NULL;
+ const char *subdir, *syspath;
+ int r;
+
+ assert(ret);
+ assert(child);
+
+ r = sd_device_get_syspath(child, &syspath);
+ if (r < 0)
+ return r;
+
+ path = strdup(syspath);
+ if (!path)
+ return -ENOMEM;
+ subdir = path + STRLEN("/sys");
+
+ for (;;) {
+ char *pos;
+
+ pos = strrchr(subdir, '/');
+ if (!pos || pos < subdir + 2)
+ break;
+
+ *pos = '\0';
+
+ r = sd_device_new_from_syspath(ret, path);
+ if (r < 0)
+ continue;
+
+ return 0;
+ }
+
+ return -ENODEV;
+}
+
+_public_ int sd_device_get_parent(sd_device *child, sd_device **ret) {
+
+ assert_return(ret, -EINVAL);
+ assert_return(child, -EINVAL);
+
+ if (!child->parent_set) {
+ child->parent_set = true;
+
+ (void) device_new_from_child(&child->parent, child);
+ }
+
+ if (!child->parent)
+ return -ENOENT;
+
+ *ret = child->parent;
+ return 0;
+}
+
+int device_set_subsystem(sd_device *device, const char *_subsystem) {
+ _cleanup_free_ char *subsystem = NULL;
+ int r;
+
+ assert(device);
+ assert(_subsystem);
+
+ subsystem = strdup(_subsystem);
+ if (!subsystem)
+ return -ENOMEM;
+
+ r = device_add_property_internal(device, "SUBSYSTEM", subsystem);
+ if (r < 0)
+ return r;
+
+ device->subsystem_set = true;
+ return free_and_replace(device->subsystem, subsystem);
+}
+
+static int device_set_drivers_subsystem(sd_device *device, const char *_subsystem) {
+ _cleanup_free_ char *subsystem = NULL;
+ int r;
+
+ assert(device);
+ assert(_subsystem);
+ assert(*_subsystem);
+
+ subsystem = strdup(_subsystem);
+ if (!subsystem)
+ return -ENOMEM;
+
+ r = device_set_subsystem(device, "drivers");
+ if (r < 0)
+ return r;
+
+ return free_and_replace(device->driver_subsystem, subsystem);
+}
+
+_public_ int sd_device_get_subsystem(sd_device *device, const char **ret) {
+ const char *syspath, *drivers = NULL;
+ int r;
+
+ assert_return(ret, -EINVAL);
+ assert_return(device, -EINVAL);
+
+ r = sd_device_get_syspath(device, &syspath);
+ if (r < 0)
+ return r;
+
+ if (!device->subsystem_set) {
+ _cleanup_free_ char *subsystem = NULL;
+ char *path;
+
+ /* read 'subsystem' link */
+ path = strjoina(syspath, "/subsystem");
+ r = readlink_value(path, &subsystem);
+ if (r >= 0)
+ r = device_set_subsystem(device, subsystem);
+ /* use implicit names */
+ else if (path_startswith(device->devpath, "/module/"))
+ r = device_set_subsystem(device, "module");
+ else if (!(drivers = strstr(syspath, "/drivers/")) &&
+ PATH_STARTSWITH_SET(device->devpath, "/subsystem/",
+ "/class/",
+ "/bus/"))
+ r = device_set_subsystem(device, "subsystem");
+ if (r < 0 && r != -ENOENT)
+ return log_device_debug_errno(device, r, "sd-device: Failed to set subsystem for %s: %m", device->devpath);
+
+ device->subsystem_set = true;
+ } else if (!device->driver_subsystem_set)
+ drivers = strstr(syspath, "/drivers/");
+
+ if (!device->driver_subsystem_set) {
+ if (drivers) {
+ _cleanup_free_ char *subpath = NULL;
+
+ subpath = strndup(syspath, drivers - syspath);
+ if (!subpath)
+ r = -ENOMEM;
+ else {
+ const char *subsys;
+
+ subsys = strrchr(subpath, '/');
+ if (!subsys)
+ r = -EINVAL;
+ else
+ r = device_set_drivers_subsystem(device, subsys + 1);
+ }
+ if (r < 0 && r != -ENOENT)
+ return log_device_debug_errno(device, r, "sd-device: Failed to set subsystem for driver %s: %m", device->devpath);
+ }
+
+ device->driver_subsystem_set = true;
+ }
+
+ if (!device->subsystem)
+ return -ENOENT;
+
+ *ret = device->subsystem;
+ return 0;
+}
+
+_public_ int sd_device_get_devtype(sd_device *device, const char **devtype) {
+ int r;
+
+ assert_return(device, -EINVAL);
+
+ r = device_read_uevent_file(device);
+ if (r < 0)
+ return r;
+
+ if (!device->devtype)
+ return -ENOENT;
+
+ if (devtype)
+ *devtype = device->devtype;
+
+ return !!device->devtype;
+}
+
+_public_ int sd_device_get_parent_with_subsystem_devtype(sd_device *child, const char *subsystem, const char *devtype, sd_device **ret) {
+ sd_device *parent = NULL;
+ int r;
+
+ assert_return(child, -EINVAL);
+ assert_return(subsystem, -EINVAL);
+
+ r = sd_device_get_parent(child, &parent);
+ while (r >= 0) {
+ const char *parent_subsystem = NULL;
+ const char *parent_devtype = NULL;
+
+ (void) sd_device_get_subsystem(parent, &parent_subsystem);
+ if (streq_ptr(parent_subsystem, subsystem)) {
+ if (!devtype)
+ break;
+
+ (void) sd_device_get_devtype(parent, &parent_devtype);
+ if (streq_ptr(parent_devtype, devtype))
+ break;
+ }
+ r = sd_device_get_parent(parent, &parent);
+ }
+
+ if (r < 0)
+ return r;
+
+ *ret = parent;
+ return 0;
+}
+
+_public_ int sd_device_get_devnum(sd_device *device, dev_t *devnum) {
+ int r;
+
+ assert_return(device, -EINVAL);
+
+ r = device_read_uevent_file(device);
+ if (r < 0)
+ return r;
+
+ if (major(device->devnum) <= 0)
+ return -ENOENT;
+
+ if (devnum)
+ *devnum = device->devnum;
+
+ return 0;
+}
+
+int device_set_driver(sd_device *device, const char *_driver) {
+ _cleanup_free_ char *driver = NULL;
+ int r;
+
+ assert(device);
+ assert(_driver);
+
+ driver = strdup(_driver);
+ if (!driver)
+ return -ENOMEM;
+
+ r = device_add_property_internal(device, "DRIVER", driver);
+ if (r < 0)
+ return r;
+
+ device->driver_set = true;
+ return free_and_replace(device->driver, driver);
+}
+
+_public_ int sd_device_get_driver(sd_device *device, const char **ret) {
+ assert_return(device, -EINVAL);
+ assert_return(ret, -EINVAL);
+
+ if (!device->driver_set) {
+ _cleanup_free_ char *driver = NULL;
+ const char *syspath;
+ char *path;
+ int r;
+
+ r = sd_device_get_syspath(device, &syspath);
+ if (r < 0)
+ return r;
+
+ path = strjoina(syspath, "/driver");
+ r = readlink_value(path, &driver);
+ if (r >= 0) {
+ r = device_set_driver(device, driver);
+ if (r < 0)
+ return log_device_debug_errno(device, r, "sd-device: Failed to set driver for %s: %m", device->devpath);
+ } else if (r == -ENOENT)
+ device->driver_set = true;
+ else
+ return log_device_debug_errno(device, r, "sd-device: Failed to set driver for %s: %m", device->devpath);
+ }
+
+ if (!device->driver)
+ return -ENOENT;
+
+ *ret = device->driver;
+ return 0;
+}
+
+_public_ int sd_device_get_devpath(sd_device *device, const char **devpath) {
+ assert_return(device, -EINVAL);
+ assert_return(devpath, -EINVAL);
+
+ assert(device->devpath);
+ assert(device->devpath[0] == '/');
+
+ *devpath = device->devpath;
+ return 0;
+}
+
+_public_ int sd_device_get_devname(sd_device *device, const char **devname) {
+ int r;
+
+ assert_return(device, -EINVAL);
+ assert_return(devname, -EINVAL);
+
+ r = device_read_uevent_file(device);
+ if (r < 0)
+ return r;
+
+ if (!device->devname)
+ return -ENOENT;
+
+ assert(path_startswith(device->devname, "/dev/"));
+
+ *devname = device->devname;
+ return 0;
+}
+
+static int device_set_sysname(sd_device *device) {
+ _cleanup_free_ char *sysname = NULL;
+ const char *sysnum = NULL;
+ const char *pos;
+ size_t len = 0;
+
+ if (!device->devpath)
+ return -EINVAL;
+
+ pos = strrchr(device->devpath, '/');
+ if (!pos)
+ return -EINVAL;
+ pos++;
+
+ /* devpath is not a root directory */
+ if (*pos == '\0' || pos <= device->devpath)
+ return -EINVAL;
+
+ sysname = strdup(pos);
+ if (!sysname)
+ return -ENOMEM;
+
+ /* some devices have '!' in their name, change that to '/' */
+ while (sysname[len] != '\0') {
+ if (sysname[len] == '!')
+ sysname[len] = '/';
+
+ len++;
+ }
+
+ /* trailing number */
+ while (len > 0 && isdigit(sysname[--len]))
+ sysnum = &sysname[len];
+
+ if (len == 0)
+ sysnum = NULL;
+
+ device->sysname_set = true;
+ device->sysnum = sysnum;
+ return free_and_replace(device->sysname, sysname);
+}
+
+_public_ int sd_device_get_sysname(sd_device *device, const char **ret) {
+ int r;
+
+ assert_return(device, -EINVAL);
+ assert_return(ret, -EINVAL);
+
+ if (!device->sysname_set) {
+ r = device_set_sysname(device);
+ if (r < 0)
+ return r;
+ }
+
+ assert_return(device->sysname, -ENOENT);
+
+ *ret = device->sysname;
+ return 0;
+}
+
+_public_ int sd_device_get_sysnum(sd_device *device, const char **ret) {
+ int r;
+
+ assert_return(device, -EINVAL);
+ assert_return(ret, -EINVAL);
+
+ if (!device->sysname_set) {
+ r = device_set_sysname(device);
+ if (r < 0)
+ return r;
+ }
+
+ if (!device->sysnum)
+ return -ENOENT;
+
+ *ret = device->sysnum;
+ return 0;
+}
+
+static bool is_valid_tag(const char *tag) {
+ assert(tag);
+
+ return !strchr(tag, ':') && !strchr(tag, ' ');
+}
+
+int device_add_tag(sd_device *device, const char *tag, bool both) {
+ int r, added;
+
+ assert(device);
+ assert(tag);
+
+ if (!is_valid_tag(tag))
+ return -EINVAL;
+
+ /* Definitely add to the "all" list of tags (i.e. the sticky list) */
+ added = set_put_strdup(&device->all_tags, tag);
+ if (added < 0)
+ return added;
+
+ /* And optionally, also add it to the current list of tags */
+ if (both) {
+ r = set_put_strdup(&device->current_tags, tag);
+ if (r < 0) {
+ if (added > 0)
+ (void) set_remove(device->all_tags, tag);
+
+ return r;
+ }
+ }
+
+ device->tags_generation++;
+ device->property_tags_outdated = true;
+
+ return 0;
+}
+
+int device_add_devlink(sd_device *device, const char *devlink) {
+ int r;
+
+ assert(device);
+ assert(devlink);
+
+ r = set_put_strdup(&device->devlinks, devlink);
+ if (r < 0)
+ return r;
+
+ device->devlinks_generation++;
+ device->property_devlinks_outdated = true;
+
+ return 0;
+}
+
+static int device_add_property_internal_from_string(sd_device *device, const char *str) {
+ _cleanup_free_ char *key = NULL;
+ char *value;
+ int r;
+
+ assert(device);
+ assert(str);
+
+ key = strdup(str);
+ if (!key)
+ return -ENOMEM;
+
+ value = strchr(key, '=');
+ if (!value)
+ return -EINVAL;
+
+ *value = '\0';
+
+ if (isempty(++value))
+ value = NULL;
+
+ /* Add the property to both sd_device::properties and sd_device::properties_db,
+ * as this is called by only handle_db_line(). */
+ r = device_add_property_aux(device, key, value, false);
+ if (r < 0)
+ return r;
+
+ return device_add_property_aux(device, key, value, true);
+}
+
+int device_set_usec_initialized(sd_device *device, usec_t when) {
+ char s[DECIMAL_STR_MAX(usec_t)];
+ int r;
+
+ assert(device);
+
+ xsprintf(s, USEC_FMT, when);
+
+ r = device_add_property_internal(device, "USEC_INITIALIZED", s);
+ if (r < 0)
+ return r;
+
+ device->usec_initialized = when;
+ return 0;
+}
+
+static int handle_db_line(sd_device *device, char key, const char *value) {
+ char *path;
+ int r;
+
+ assert(device);
+ assert(value);
+
+ switch (key) {
+ case 'G': /* Any tag */
+ case 'Q': /* Current tag */
+ r = device_add_tag(device, value, key == 'Q');
+ if (r < 0)
+ return r;
+
+ break;
+ case 'S':
+ path = strjoina("/dev/", value);
+ r = device_add_devlink(device, path);
+ if (r < 0)
+ return r;
+
+ break;
+ case 'E':
+ r = device_add_property_internal_from_string(device, value);
+ if (r < 0)
+ return r;
+
+ break;
+ case 'I': {
+ usec_t t;
+
+ r = safe_atou64(value, &t);
+ if (r < 0)
+ return r;
+
+ r = device_set_usec_initialized(device, t);
+ if (r < 0)
+ return r;
+
+ break;
+ }
+ case 'L':
+ r = safe_atoi(value, &device->devlink_priority);
+ if (r < 0)
+ return r;
+
+ break;
+ case 'W':
+ r = safe_atoi(value, &device->watch_handle);
+ if (r < 0)
+ return r;
+
+ break;
+ case 'V':
+ r = safe_atou(value, &device->database_version);
+ if (r < 0)
+ return r;
+
+ break;
+ default:
+ log_device_debug(device, "sd-device: Unknown key '%c' in device db, ignoring", key);
+ }
+
+ return 0;
+}
+
+int device_get_id_filename(sd_device *device, const char **ret) {
+ assert(device);
+ assert(ret);
+
+ if (!device->id_filename) {
+ _cleanup_free_ char *id = NULL;
+ const char *subsystem;
+ dev_t devnum;
+ int ifindex, r;
+
+ r = sd_device_get_subsystem(device, &subsystem);
+ if (r < 0)
+ return r;
+
+ if (sd_device_get_devnum(device, &devnum) >= 0) {
+ assert(subsystem);
+
+ /* use dev_t — b259:131072, c254:0 */
+ r = asprintf(&id, "%c%u:%u",
+ streq(subsystem, "block") ? 'b' : 'c',
+ major(devnum), minor(devnum));
+ if (r < 0)
+ return -ENOMEM;
+ } else if (sd_device_get_ifindex(device, &ifindex) >= 0) {
+ /* use netdev ifindex — n3 */
+ r = asprintf(&id, "n%u", (unsigned) ifindex);
+ if (r < 0)
+ return -ENOMEM;
+ } else {
+ /* use $subsys:$sysname — pci:0000:00:1f.2
+ * sysname() has '!' translated, get it from devpath
+ */
+ const char *sysname;
+
+ sysname = basename(device->devpath);
+ if (!sysname)
+ return -EINVAL;
+
+ if (!subsystem)
+ return -EINVAL;
+
+
+ if (streq(subsystem, "drivers"))
+ /* the 'drivers' pseudo-subsystem is special, and needs the real subsystem
+ * encoded as well */
+ id = strjoin("+drivers:", device->driver_subsystem, ":", sysname);
+ else
+ id = strjoin("+", subsystem, ":", sysname);
+ if (!id)
+ return -ENOMEM;
+ }
+
+ device->id_filename = TAKE_PTR(id);
+ }
+
+ *ret = device->id_filename;
+ return 0;
+}
+
+int device_read_db_internal_filename(sd_device *device, const char *filename) {
+ _cleanup_free_ char *db = NULL;
+ const char *value;
+ size_t db_len, i;
+ char key;
+ int r;
+
+ enum {
+ PRE_KEY,
+ KEY,
+ PRE_VALUE,
+ VALUE,
+ INVALID_LINE,
+ } state = PRE_KEY;
+
+ assert(device);
+ assert(filename);
+
+ r = read_full_file(filename, &db, &db_len);
+ if (r < 0) {
+ if (r == -ENOENT)
+ return 0;
+
+ return log_device_debug_errno(device, r, "sd-device: Failed to read db '%s': %m", filename);
+ }
+
+ /* devices with a database entry are initialized */
+ device->is_initialized = true;
+
+ device->db_loaded = true;
+
+ for (i = 0; i < db_len; i++) {
+ switch (state) {
+ case PRE_KEY:
+ if (!strchr(NEWLINE, db[i])) {
+ key = db[i];
+
+ state = KEY;
+ }
+
+ break;
+ case KEY:
+ if (db[i] != ':') {
+ log_device_debug(device, "sd-device: Invalid db entry with key '%c', ignoring", key);
+
+ state = INVALID_LINE;
+ } else {
+ db[i] = '\0';
+
+ state = PRE_VALUE;
+ }
+
+ break;
+ case PRE_VALUE:
+ value = &db[i];
+
+ state = VALUE;
+
+ break;
+ case INVALID_LINE:
+ if (strchr(NEWLINE, db[i]))
+ state = PRE_KEY;
+
+ break;
+ case VALUE:
+ if (strchr(NEWLINE, db[i])) {
+ db[i] = '\0';
+ r = handle_db_line(device, key, value);
+ if (r < 0)
+ log_device_debug_errno(device, r, "sd-device: Failed to handle db entry '%c:%s', ignoring: %m", key, value);
+
+ state = PRE_KEY;
+ }
+
+ break;
+ default:
+ return log_device_debug_errno(device, SYNTHETIC_ERRNO(EINVAL), "sd-device: invalid db syntax.");
+ }
+ }
+
+ return 0;
+}
+
+int device_read_db_internal(sd_device *device, bool force) {
+ const char *id, *path;
+ int r;
+
+ assert(device);
+
+ if (device->db_loaded || (!force && device->sealed))
+ return 0;
+
+ r = device_get_id_filename(device, &id);
+ if (r < 0)
+ return r;
+
+ path = strjoina("/run/udev/data/", id);
+
+ return device_read_db_internal_filename(device, path);
+}
+
+_public_ int sd_device_get_is_initialized(sd_device *device) {
+ int r;
+
+ assert_return(device, -EINVAL);
+
+ r = device_read_db(device);
+ if (r < 0)
+ return r;
+
+ return device->is_initialized;
+}
+
+_public_ int sd_device_get_usec_since_initialized(sd_device *device, uint64_t *usec) {
+ usec_t now_ts;
+ int r;
+
+ assert_return(device, -EINVAL);
+ assert_return(usec, -EINVAL);
+
+ r = device_read_db(device);
+ if (r < 0)
+ return r;
+
+ if (!device->is_initialized)
+ return -EBUSY;
+
+ if (!device->usec_initialized)
+ return -ENODATA;
+
+ now_ts = now(clock_boottime_or_monotonic());
+
+ if (now_ts < device->usec_initialized)
+ return -EIO;
+
+ *usec = now_ts - device->usec_initialized;
+ return 0;
+}
+
+_public_ const char *sd_device_get_tag_first(sd_device *device) {
+ void *v;
+
+ assert_return(device, NULL);
+
+ (void) device_read_db(device);
+
+ device->all_tags_iterator_generation = device->tags_generation;
+ device->all_tags_iterator = ITERATOR_FIRST;
+
+ (void) set_iterate(device->all_tags, &device->all_tags_iterator, &v);
+ return v;
+}
+
+_public_ const char *sd_device_get_tag_next(sd_device *device) {
+ void *v;
+
+ assert_return(device, NULL);
+
+ (void) device_read_db(device);
+
+ if (device->all_tags_iterator_generation != device->tags_generation)
+ return NULL;
+
+ (void) set_iterate(device->all_tags, &device->all_tags_iterator, &v);
+ return v;
+}
+
+static bool device_database_supports_current_tags(sd_device *device) {
+ assert(device);
+
+ (void) device_read_db(device);
+
+ /* The current tags (saved in Q field) feature is implemented in database version 1.
+ * If the database version is 0, then the tags (NOT current tags, saved in G field) are not
+ * sticky. Thus, we can safely bypass the operations for the current tags (Q) to tags (G). */
+
+ return device->database_version >= 1;
+}
+
+_public_ const char *sd_device_get_current_tag_first(sd_device *device) {
+ void *v;
+
+ assert_return(device, NULL);
+
+ if (!device_database_supports_current_tags(device))
+ return sd_device_get_tag_first(device);
+
+ (void) device_read_db(device);
+
+ device->current_tags_iterator_generation = device->tags_generation;
+ device->current_tags_iterator = ITERATOR_FIRST;
+
+ (void) set_iterate(device->current_tags, &device->current_tags_iterator, &v);
+ return v;
+}
+
+_public_ const char *sd_device_get_current_tag_next(sd_device *device) {
+ void *v;
+
+ assert_return(device, NULL);
+
+ if (!device_database_supports_current_tags(device))
+ return sd_device_get_tag_next(device);
+
+ (void) device_read_db(device);
+
+ if (device->current_tags_iterator_generation != device->tags_generation)
+ return NULL;
+
+ (void) set_iterate(device->current_tags, &device->current_tags_iterator, &v);
+ return v;
+}
+
+_public_ const char *sd_device_get_devlink_first(sd_device *device) {
+ void *v;
+
+ assert_return(device, NULL);
+
+ (void) device_read_db(device);
+
+ device->devlinks_iterator_generation = device->devlinks_generation;
+ device->devlinks_iterator = ITERATOR_FIRST;
+
+ (void) set_iterate(device->devlinks, &device->devlinks_iterator, &v);
+ return v;
+}
+
+_public_ const char *sd_device_get_devlink_next(sd_device *device) {
+ void *v;
+
+ assert_return(device, NULL);
+
+ (void) device_read_db(device);
+
+ if (device->devlinks_iterator_generation != device->devlinks_generation)
+ return NULL;
+
+ (void) set_iterate(device->devlinks, &device->devlinks_iterator, &v);
+ return v;
+}
+
+int device_properties_prepare(sd_device *device) {
+ int r;
+
+ assert(device);
+
+ r = device_read_uevent_file(device);
+ if (r < 0)
+ return r;
+
+ r = device_read_db(device);
+ if (r < 0)
+ return r;
+
+ if (device->property_devlinks_outdated) {
+ _cleanup_free_ char *devlinks = NULL;
+
+ r = set_strjoin(device->devlinks, " ", false, &devlinks);
+ if (r < 0)
+ return r;
+
+ if (!isempty(devlinks)) {
+ r = device_add_property_internal(device, "DEVLINKS", devlinks);
+ if (r < 0)
+ return r;
+ }
+
+ device->property_devlinks_outdated = false;
+ }
+
+ if (device->property_tags_outdated) {
+ _cleanup_free_ char *tags = NULL;
+
+ r = set_strjoin(device->all_tags, ":", true, &tags);
+ if (r < 0)
+ return r;
+
+ if (!isempty(tags)) {
+ r = device_add_property_internal(device, "TAGS", tags);
+ if (r < 0)
+ return r;
+ }
+
+ tags = mfree(tags);
+ r = set_strjoin(device->current_tags, ":", true, &tags);
+ if (r < 0)
+ return r;
+
+ if (!isempty(tags)) {
+ r = device_add_property_internal(device, "CURRENT_TAGS", tags);
+ if (r < 0)
+ return r;
+ }
+
+ device->property_tags_outdated = false;
+ }
+
+ return 0;
+}
+
+_public_ const char *sd_device_get_property_first(sd_device *device, const char **_value) {
+ const char *key;
+ int r;
+
+ assert_return(device, NULL);
+
+ r = device_properties_prepare(device);
+ if (r < 0)
+ return NULL;
+
+ device->properties_iterator_generation = device->properties_generation;
+ device->properties_iterator = ITERATOR_FIRST;
+
+ (void) ordered_hashmap_iterate(device->properties, &device->properties_iterator, (void**)_value, (const void**)&key);
+ return key;
+}
+
+_public_ const char *sd_device_get_property_next(sd_device *device, const char **_value) {
+ const char *key;
+ int r;
+
+ assert_return(device, NULL);
+
+ r = device_properties_prepare(device);
+ if (r < 0)
+ return NULL;
+
+ if (device->properties_iterator_generation != device->properties_generation)
+ return NULL;
+
+ (void) ordered_hashmap_iterate(device->properties, &device->properties_iterator, (void**)_value, (const void**)&key);
+ return key;
+}
+
+static int device_sysattrs_read_all_internal(sd_device *device, const char *subdir) {
+ _cleanup_free_ char *path_dir = NULL;
+ _cleanup_closedir_ DIR *dir = NULL;
+ struct dirent *dent;
+ const char *syspath;
+ int r;
+
+ r = sd_device_get_syspath(device, &syspath);
+ if (r < 0)
+ return r;
+
+ if (subdir) {
+ _cleanup_free_ char *p = NULL;
+
+ p = path_join(syspath, subdir, "uevent");
+ if (!p)
+ return -ENOMEM;
+
+ if (access(p, F_OK) >= 0)
+ /* this is a child device, skipping */
+ return 0;
+ if (errno != ENOENT) {
+ log_device_debug_errno(device, errno, "sd-device: Failed to stat %s, ignoring subdir: %m", p);
+ return 0;
+ }
+
+ path_dir = path_join(syspath, subdir);
+ if (!path_dir)
+ return -ENOMEM;
+ }
+
+ dir = opendir(path_dir ?: syspath);
+ if (!dir)
+ return -errno;
+
+ FOREACH_DIRENT_ALL(dent, dir, return -errno) {
+ _cleanup_free_ char *path = NULL, *p = NULL;
+ struct stat statbuf;
+
+ if (dot_or_dot_dot(dent->d_name))
+ continue;
+
+ /* only handle symlinks, regular files, and directories */
+ if (!IN_SET(dent->d_type, DT_LNK, DT_REG, DT_DIR))
+ continue;
+
+ if (subdir) {
+ p = path_join(subdir, dent->d_name);
+ if (!p)
+ return -ENOMEM;
+ }
+
+ if (dent->d_type == DT_DIR) {
+ /* read subdirectory */
+ r = device_sysattrs_read_all_internal(device, p ?: dent->d_name);
+ if (r < 0)
+ return r;
+
+ continue;
+ }
+
+ path = path_join(syspath, p ?: dent->d_name);
+ if (!path)
+ return -ENOMEM;
+
+ if (lstat(path, &statbuf) != 0)
+ continue;
+
+ if (!(statbuf.st_mode & S_IRUSR))
+ continue;
+
+ r = set_put_strdup(&device->sysattrs, p ?: dent->d_name);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static int device_sysattrs_read_all(sd_device *device) {
+ int r;
+
+ assert(device);
+
+ if (device->sysattrs_read)
+ return 0;
+
+ r = device_sysattrs_read_all_internal(device, NULL);
+ if (r < 0)
+ return r;
+
+ device->sysattrs_read = true;
+
+ return 0;
+}
+
+_public_ const char *sd_device_get_sysattr_first(sd_device *device) {
+ void *v;
+ int r;
+
+ assert_return(device, NULL);
+
+ if (!device->sysattrs_read) {
+ r = device_sysattrs_read_all(device);
+ if (r < 0) {
+ errno = -r;
+ return NULL;
+ }
+ }
+
+ device->sysattrs_iterator = ITERATOR_FIRST;
+
+ (void) set_iterate(device->sysattrs, &device->sysattrs_iterator, &v);
+ return v;
+}
+
+_public_ const char *sd_device_get_sysattr_next(sd_device *device) {
+ void *v;
+
+ assert_return(device, NULL);
+
+ if (!device->sysattrs_read)
+ return NULL;
+
+ (void) set_iterate(device->sysattrs, &device->sysattrs_iterator, &v);
+ return v;
+}
+
+_public_ int sd_device_has_tag(sd_device *device, const char *tag) {
+ assert_return(device, -EINVAL);
+ assert_return(tag, -EINVAL);
+
+ (void) device_read_db(device);
+
+ return set_contains(device->all_tags, tag);
+}
+
+_public_ int sd_device_has_current_tag(sd_device *device, const char *tag) {
+ assert_return(device, -EINVAL);
+ assert_return(tag, -EINVAL);
+
+ if (!device_database_supports_current_tags(device))
+ return sd_device_has_tag(device, tag);
+
+ (void) device_read_db(device);
+
+ return set_contains(device->current_tags, tag);
+}
+
+_public_ int sd_device_get_property_value(sd_device *device, const char *key, const char **_value) {
+ char *value;
+ int r;
+
+ assert_return(device, -EINVAL);
+ assert_return(key, -EINVAL);
+
+ r = device_properties_prepare(device);
+ if (r < 0)
+ return r;
+
+ value = ordered_hashmap_get(device->properties, key);
+ if (!value)
+ return -ENOENT;
+
+ if (_value)
+ *_value = value;
+ return 0;
+}
+
+/* replaces the value if it already exists */
+static int device_add_sysattr_value(sd_device *device, const char *_key, char *value) {
+ _cleanup_free_ char *key = NULL;
+ _cleanup_free_ char *value_old = NULL;
+ int r;
+
+ assert(device);
+ assert(_key);
+
+ r = hashmap_ensure_allocated(&device->sysattr_values, &string_hash_ops);
+ if (r < 0)
+ return r;
+
+ value_old = hashmap_remove2(device->sysattr_values, _key, (void **)&key);
+ if (!key) {
+ key = strdup(_key);
+ if (!key)
+ return -ENOMEM;
+ }
+
+ r = hashmap_put(device->sysattr_values, key, value);
+ if (r < 0)
+ return r;
+ TAKE_PTR(key);
+
+ return 0;
+}
+
+static int device_get_sysattr_value(sd_device *device, const char *_key, const char **_value) {
+ const char *key = NULL, *value;
+
+ assert(device);
+ assert(_key);
+
+ value = hashmap_get2(device->sysattr_values, _key, (void **) &key);
+ if (!key)
+ return -ENOENT;
+
+ if (_value)
+ *_value = value;
+ return 0;
+}
+
+/* We cache all sysattr lookups. If an attribute does not exist, it is stored
+ * with a NULL value in the cache, otherwise the returned string is stored */
+_public_ int sd_device_get_sysattr_value(sd_device *device, const char *sysattr, const char **_value) {
+ _cleanup_free_ char *value = NULL;
+ const char *path, *syspath, *cached_value = NULL;
+ struct stat statbuf;
+ int r;
+
+ assert_return(device, -EINVAL);
+ assert_return(sysattr, -EINVAL);
+
+ /* look for possibly already cached result */
+ r = device_get_sysattr_value(device, sysattr, &cached_value);
+ if (r != -ENOENT) {
+ if (r < 0)
+ return r;
+
+ if (!cached_value)
+ /* we looked up the sysattr before and it did not exist */
+ return -ENOENT;
+
+ if (_value)
+ *_value = cached_value;
+
+ return 0;
+ }
+
+ r = sd_device_get_syspath(device, &syspath);
+ if (r < 0)
+ return r;
+
+ path = prefix_roota(syspath, sysattr);
+ r = lstat(path, &statbuf);
+ if (r < 0) {
+ /* remember that we could not access the sysattr */
+ r = device_add_sysattr_value(device, sysattr, NULL);
+ if (r < 0)
+ return r;
+
+ return -ENOENT;
+ } else if (S_ISLNK(statbuf.st_mode)) {
+ /* Some core links return only the last element of the target path,
+ * these are just values, the paths should not be exposed. */
+ if (STR_IN_SET(sysattr, "driver", "subsystem", "module")) {
+ r = readlink_value(path, &value);
+ if (r < 0)
+ return r;
+ } else
+ return -EINVAL;
+ } else if (S_ISDIR(statbuf.st_mode)) {
+ /* skip directories */
+ return -EINVAL;
+ } else if (!(statbuf.st_mode & S_IRUSR)) {
+ /* skip non-readable files */
+ return -EPERM;
+ } else {
+ size_t size;
+
+ /* read attribute value */
+ r = read_full_virtual_file(path, &value, &size);
+ if (r < 0)
+ return r;
+
+ /* drop trailing newlines */
+ while (size > 0 && value[--size] == '\n')
+ value[size] = '\0';
+ }
+
+ r = device_add_sysattr_value(device, sysattr, value);
+ if (r < 0)
+ return r;
+
+ *_value = TAKE_PTR(value);
+
+ return 0;
+}
+
+static void device_remove_sysattr_value(sd_device *device, const char *_key) {
+ _cleanup_free_ char *key = NULL;
+
+ assert(device);
+ assert(_key);
+
+ free(hashmap_remove2(device->sysattr_values, _key, (void **) &key));
+}
+
+/* set the attribute and save it in the cache. If a NULL value is passed the
+ * attribute is cleared from the cache */
+_public_ int sd_device_set_sysattr_value(sd_device *device, const char *sysattr, const char *_value) {
+ _cleanup_free_ char *value = NULL;
+ const char *syspath, *path;
+ size_t len;
+ int r;
+
+ assert_return(device, -EINVAL);
+ assert_return(sysattr, -EINVAL);
+
+ if (!_value) {
+ device_remove_sysattr_value(device, sysattr);
+ return 0;
+ }
+
+ r = sd_device_get_syspath(device, &syspath);
+ if (r < 0)
+ return r;
+
+ path = prefix_roota(syspath, sysattr);
+
+ len = strlen(_value);
+
+ /* drop trailing newlines */
+ while (len > 0 && _value[len - 1] == '\n')
+ len --;
+
+ /* value length is limited to 4k */
+ if (len > 4096)
+ return -EINVAL;
+
+ value = strndup(_value, len);
+ if (!value)
+ return -ENOMEM;
+
+ r = write_string_file(path, value, WRITE_STRING_FILE_DISABLE_BUFFER | WRITE_STRING_FILE_NOFOLLOW);
+ if (r < 0) {
+ if (r == -ELOOP)
+ return -EINVAL;
+ if (r == -EISDIR)
+ return r;
+
+ r = free_and_strdup(&value, "");
+ if (r < 0)
+ return r;
+
+ r = device_add_sysattr_value(device, sysattr, value);
+ if (r < 0)
+ return r;
+ TAKE_PTR(value);
+
+ return -ENXIO;
+ }
+
+ r = device_add_sysattr_value(device, sysattr, value);
+ if (r < 0)
+ return r;
+ TAKE_PTR(value);
+
+ return 0;
+}
+
+_public_ int sd_device_set_sysattr_valuef(sd_device *device, const char *sysattr, const char *format, ...) {
+ _cleanup_free_ char *value = NULL;
+ va_list ap;
+ int r;
+
+ assert_return(device, -EINVAL);
+ assert_return(sysattr, -EINVAL);
+
+ if (!format) {
+ device_remove_sysattr_value(device, sysattr);
+ return 0;
+ }
+
+ va_start(ap, format);
+ r = vasprintf(&value, format, ap);
+ va_end(ap);
+
+ if (r < 0)
+ return -ENOMEM;
+
+ return sd_device_set_sysattr_value(device, sysattr, value);
+}
diff --git a/src/libsystemd/sd-device/test-sd-device-monitor.c b/src/libsystemd/sd-device/test-sd-device-monitor.c
new file mode 100644
index 0000000..fddd1c1
--- /dev/null
+++ b/src/libsystemd/sd-device/test-sd-device-monitor.c
@@ -0,0 +1,218 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <stdbool.h>
+#include <unistd.h>
+
+#include "sd-device.h"
+#include "sd-event.h"
+
+#include "device-monitor-private.h"
+#include "device-private.h"
+#include "device-util.h"
+#include "macro.h"
+#include "string-util.h"
+#include "tests.h"
+#include "util.h"
+#include "virt.h"
+
+static int monitor_handler(sd_device_monitor *m, sd_device *d, void *userdata) {
+ const char *s, *syspath = userdata;
+
+ assert_se(sd_device_get_syspath(d, &s) >= 0);
+ assert_se(streq(s, syspath));
+
+ return sd_event_exit(sd_device_monitor_get_event(m), 100);
+}
+
+static int test_receive_device_fail(void) {
+ _cleanup_(sd_device_monitor_unrefp) sd_device_monitor *monitor_server = NULL, *monitor_client = NULL;
+ _cleanup_(sd_device_unrefp) sd_device *loopback = NULL;
+ const char *syspath;
+ int r;
+
+ log_info("/* %s */", __func__);
+
+ /* Try to send device with invalid action and without seqnum. */
+ assert_se(sd_device_new_from_syspath(&loopback, "/sys/class/net/lo") >= 0);
+ assert_se(device_add_property(loopback, "ACTION", "hoge") >= 0);
+
+ assert_se(sd_device_get_syspath(loopback, &syspath) >= 0);
+
+ assert_se(device_monitor_new_full(&monitor_server, MONITOR_GROUP_NONE, -1) >= 0);
+ assert_se(sd_device_monitor_start(monitor_server, NULL, NULL) >= 0);
+ assert_se(sd_event_source_set_description(sd_device_monitor_get_event_source(monitor_server), "sender") >= 0);
+
+ assert_se(device_monitor_new_full(&monitor_client, MONITOR_GROUP_NONE, -1) >= 0);
+ assert_se(device_monitor_allow_unicast_sender(monitor_client, monitor_server) >= 0);
+ assert_se(sd_device_monitor_start(monitor_client, monitor_handler, (void *) syspath) >= 0);
+ assert_se(sd_event_source_set_description(sd_device_monitor_get_event_source(monitor_client), "receiver") >= 0);
+
+ /* Do not use assert_se() here. */
+ r = device_monitor_send_device(monitor_server, monitor_client, loopback);
+ if (r < 0)
+ return log_error_errno(r, "Failed to send loopback device: %m");
+
+ assert_se(sd_event_run(sd_device_monitor_get_event(monitor_client), 0) >= 0);
+
+ return 0;
+}
+
+static void test_send_receive_one(sd_device *device, bool subsystem_filter, bool tag_filter, bool use_bpf) {
+ _cleanup_(sd_device_monitor_unrefp) sd_device_monitor *monitor_server = NULL, *monitor_client = NULL;
+ const char *syspath, *subsystem, *tag, *devtype = NULL;
+
+ log_device_info(device, "/* %s(subsystem_filter=%s, tag_filter=%s, use_bpf=%s) */", __func__,
+ true_false(subsystem_filter), true_false(tag_filter), true_false(use_bpf));
+
+ assert_se(sd_device_get_syspath(device, &syspath) >= 0);
+
+ assert_se(device_monitor_new_full(&monitor_server, MONITOR_GROUP_NONE, -1) >= 0);
+ assert_se(sd_device_monitor_start(monitor_server, NULL, NULL) >= 0);
+ assert_se(sd_event_source_set_description(sd_device_monitor_get_event_source(monitor_server), "sender") >= 0);
+
+ assert_se(device_monitor_new_full(&monitor_client, MONITOR_GROUP_NONE, -1) >= 0);
+ assert_se(device_monitor_allow_unicast_sender(monitor_client, monitor_server) >= 0);
+ assert_se(sd_device_monitor_start(monitor_client, monitor_handler, (void *) syspath) >= 0);
+ assert_se(sd_event_source_set_description(sd_device_monitor_get_event_source(monitor_client), "receiver") >= 0);
+
+ if (subsystem_filter) {
+ assert_se(sd_device_get_subsystem(device, &subsystem) >= 0);
+ (void) sd_device_get_devtype(device, &devtype);
+ assert_se(sd_device_monitor_filter_add_match_subsystem_devtype(monitor_client, subsystem, devtype) >= 0);
+ }
+
+ if (tag_filter)
+ FOREACH_DEVICE_TAG(device, tag)
+ assert_se(sd_device_monitor_filter_add_match_tag(monitor_client, tag) >= 0);
+
+ if ((subsystem_filter || tag_filter) && use_bpf)
+ assert_se(sd_device_monitor_filter_update(monitor_client) >= 0);
+
+ assert_se(device_monitor_send_device(monitor_server, monitor_client, device) >= 0);
+ assert_se(sd_event_loop(sd_device_monitor_get_event(monitor_client)) == 100);
+}
+
+static void test_subsystem_filter(sd_device *device) {
+ _cleanup_(sd_device_monitor_unrefp) sd_device_monitor *monitor_server = NULL, *monitor_client = NULL;
+ _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
+ const char *syspath, *subsystem, *p, *s;
+ sd_device *d;
+
+ log_info("/* %s */", __func__);
+
+ assert_se(sd_device_get_syspath(device, &syspath) >= 0);
+ assert_se(sd_device_get_subsystem(device, &subsystem) >= 0);
+
+ assert_se(device_monitor_new_full(&monitor_server, MONITOR_GROUP_NONE, -1) >= 0);
+ assert_se(sd_device_monitor_start(monitor_server, NULL, NULL) >= 0);
+ assert_se(sd_event_source_set_description(sd_device_monitor_get_event_source(monitor_server), "sender") >= 0);
+
+ assert_se(device_monitor_new_full(&monitor_client, MONITOR_GROUP_NONE, -1) >= 0);
+ assert_se(device_monitor_allow_unicast_sender(monitor_client, monitor_server) >= 0);
+ assert_se(sd_device_monitor_filter_add_match_subsystem_devtype(monitor_client, subsystem, NULL) >= 0);
+ assert_se(sd_device_monitor_start(monitor_client, monitor_handler, (void *) syspath) >= 0);
+ assert_se(sd_event_source_set_description(sd_device_monitor_get_event_source(monitor_client), "receiver") >= 0);
+
+ assert_se(sd_device_enumerator_new(&e) >= 0);
+ assert_se(sd_device_enumerator_add_match_subsystem(e, subsystem, false) >= 0);
+ FOREACH_DEVICE(e, d) {
+ assert_se(sd_device_get_syspath(d, &p) >= 0);
+ assert_se(sd_device_get_subsystem(d, &s) >= 0);
+
+ log_info("Sending device subsystem:%s syspath:%s", s, p);
+ assert_se(device_monitor_send_device(monitor_server, monitor_client, d) >= 0);
+ }
+
+ log_info("Sending device subsystem:%s syspath:%s", subsystem, syspath);
+ assert_se(device_monitor_send_device(monitor_server, monitor_client, device) >= 0);
+ assert_se(sd_event_loop(sd_device_monitor_get_event(monitor_client)) == 100);
+}
+
+static void test_sd_device_monitor_filter_remove(sd_device *device) {
+ _cleanup_(sd_device_monitor_unrefp) sd_device_monitor *monitor_server = NULL, *monitor_client = NULL;
+ const char *syspath;
+
+ log_device_info(device, "/* %s */", __func__);
+
+ assert_se(sd_device_get_syspath(device, &syspath) >= 0);
+
+ assert_se(device_monitor_new_full(&monitor_server, MONITOR_GROUP_NONE, -1) >= 0);
+ assert_se(sd_device_monitor_start(monitor_server, NULL, NULL) >= 0);
+ assert_se(sd_event_source_set_description(sd_device_monitor_get_event_source(monitor_server), "sender") >= 0);
+
+ assert_se(device_monitor_new_full(&monitor_client, MONITOR_GROUP_NONE, -1) >= 0);
+ assert_se(device_monitor_allow_unicast_sender(monitor_client, monitor_server) >= 0);
+ assert_se(sd_device_monitor_start(monitor_client, monitor_handler, (void *) syspath) >= 0);
+ assert_se(sd_event_source_set_description(sd_device_monitor_get_event_source(monitor_client), "receiver") >= 0);
+
+ assert_se(sd_device_monitor_filter_add_match_subsystem_devtype(monitor_client, "hoge", NULL) >= 0);
+ assert_se(sd_device_monitor_filter_update(monitor_client) >= 0);
+
+ assert_se(device_monitor_send_device(monitor_server, monitor_client, device) >= 0);
+ assert_se(sd_event_run(sd_device_monitor_get_event(monitor_client), 0) >= 0);
+
+ assert_se(sd_device_monitor_filter_remove(monitor_client) >= 0);
+
+ assert_se(device_monitor_send_device(monitor_server, monitor_client, device) >= 0);
+ assert_se(sd_event_loop(sd_device_monitor_get_event(monitor_client)) == 100);
+}
+
+static void test_device_copy_properties(sd_device *device) {
+ _cleanup_(sd_device_unrefp) sd_device *copy = NULL;
+
+ assert_se(device_shallow_clone(device, &copy) >= 0);
+ assert_se(device_copy_properties(copy, device) >= 0);
+
+ test_send_receive_one(copy, false, false, false);
+}
+
+int main(int argc, char *argv[]) {
+ _cleanup_(sd_device_unrefp) sd_device *loopback = NULL, *sda = NULL;
+ int r;
+
+ test_setup_logging(LOG_INFO);
+
+ if (getuid() != 0)
+ return log_tests_skipped("not root");
+
+ r = test_receive_device_fail();
+ if (r < 0) {
+ assert_se(r == -EPERM && detect_container() > 0);
+ return log_tests_skipped("Running in container? Skipping remaining tests");
+ }
+
+ assert_se(sd_device_new_from_syspath(&loopback, "/sys/class/net/lo") >= 0);
+ assert_se(device_add_property(loopback, "ACTION", "add") >= 0);
+ assert_se(device_add_property(loopback, "SEQNUM", "10") >= 0);
+
+ test_send_receive_one(loopback, false, false, false);
+ test_send_receive_one(loopback, true, false, false);
+ test_send_receive_one(loopback, false, true, false);
+ test_send_receive_one(loopback, true, true, false);
+ test_send_receive_one(loopback, true, false, true);
+ test_send_receive_one(loopback, false, true, true);
+ test_send_receive_one(loopback, true, true, true);
+
+ test_subsystem_filter(loopback);
+ test_sd_device_monitor_filter_remove(loopback);
+ test_device_copy_properties(loopback);
+
+ r = sd_device_new_from_subsystem_sysname(&sda, "block", "sda");
+ if (r < 0) {
+ log_info_errno(r, "Failed to create sd_device for sda, skipping remaining tests: %m");
+ return 0;
+ }
+
+ assert_se(device_add_property(sda, "ACTION", "change") >= 0);
+ assert_se(device_add_property(sda, "SEQNUM", "11") >= 0);
+
+ test_send_receive_one(sda, false, false, false);
+ test_send_receive_one(sda, true, false, false);
+ test_send_receive_one(sda, false, true, false);
+ test_send_receive_one(sda, true, true, false);
+ test_send_receive_one(sda, true, false, true);
+ test_send_receive_one(sda, false, true, true);
+ test_send_receive_one(sda, true, true, true);
+
+ return 0;
+}
diff --git a/src/libsystemd/sd-device/test-sd-device-thread.c b/src/libsystemd/sd-device/test-sd-device-thread.c
new file mode 100644
index 0000000..6f30155
--- /dev/null
+++ b/src/libsystemd/sd-device/test-sd-device-thread.c
@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <pthread.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "sd-device.h"
+
+#include "device-util.h"
+#include "macro.h"
+
+static void* thread(void *p) {
+ sd_device **d = p;
+
+ assert_se(!(*d = sd_device_unref(*d)));
+
+ return NULL;
+}
+
+int main(int argc, char *argv[]) {
+ sd_device *loopback;
+ pthread_t t;
+ const char *key, *value;
+
+ assert_se(unsetenv("SYSTEMD_MEMPOOL") == 0);
+
+ assert_se(sd_device_new_from_syspath(&loopback, "/sys/class/net/lo") >= 0);
+
+ FOREACH_DEVICE_PROPERTY(loopback, key, value)
+ printf("%s=%s\n", key, value);
+
+ assert_se(pthread_create(&t, NULL, thread, &loopback) == 0);
+ assert_se(pthread_join(t, NULL) == 0);
+
+ assert_se(!loopback);
+
+ return 0;
+}
diff --git a/src/libsystemd/sd-device/test-sd-device.c b/src/libsystemd/sd-device/test-sd-device.c
new file mode 100644
index 0000000..9f48d2b
--- /dev/null
+++ b/src/libsystemd/sd-device/test-sd-device.c
@@ -0,0 +1,172 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "device-enumerator-private.h"
+#include "device-private.h"
+#include "device-util.h"
+#include "hashmap.h"
+#include "string-util.h"
+#include "tests.h"
+#include "time-util.h"
+
+static void test_sd_device_one(sd_device *d) {
+ const char *syspath, *subsystem, *val;
+ dev_t devnum;
+ usec_t usec;
+ int i, r;
+
+ assert_se(sd_device_get_syspath(d, &syspath) >= 0);
+
+ r = sd_device_get_subsystem(d, &subsystem);
+ assert_se(r >= 0 || r == -ENOENT);
+
+ r = sd_device_get_devtype(d, &val);
+ assert_se(r >= 0 || r == -ENOENT);
+
+ r = sd_device_get_devnum(d, &devnum);
+ assert_se((r >= 0 && major(devnum) > 0) || r == -ENOENT);
+
+ r = sd_device_get_ifindex(d, &i);
+ assert_se((r >= 0 && i > 0) || r == -ENOENT);
+
+ r = sd_device_get_driver(d, &val);
+ assert_se(r >= 0 || r == -ENOENT);
+
+ assert_se(sd_device_get_devpath(d, &val) >= 0);
+
+ r = sd_device_get_devname(d, &val);
+ assert_se(r >= 0 || r == -ENOENT);
+
+ assert_se(sd_device_get_sysname(d, &val) >= 0);
+
+ r = sd_device_get_sysnum(d, &val);
+ assert_se(r >= 0 || r == -ENOENT);
+
+ i = sd_device_get_is_initialized(d);
+ assert_se(i >= 0);
+ if (i > 0) {
+ r = sd_device_get_usec_since_initialized(d, &usec);
+ assert_se((r >= 0 && usec > 0) || r == -ENODATA);
+ }
+
+ r = sd_device_get_sysattr_value(d, "name_assign_type", &val);
+ assert_se(r >= 0 || IN_SET(r, -ENOENT, -EINVAL));
+
+ r = sd_device_get_property_value(d, "ID_NET_DRIVER", &val);
+ assert_se(r >= 0 || r == -ENOENT);
+
+ log_info("syspath:%s subsystem:%s initialized:%s", syspath, strna(subsystem), yes_no(i));
+}
+
+static void test_sd_device_enumerator_devices(void) {
+ _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
+ sd_device *d;
+
+ log_info("/* %s */", __func__);
+
+ assert_se(sd_device_enumerator_new(&e) >= 0);
+ assert_se(sd_device_enumerator_allow_uninitialized(e) >= 0);
+ FOREACH_DEVICE(e, d)
+ test_sd_device_one(d);
+}
+
+static void test_sd_device_enumerator_subsystems(void) {
+ _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
+ sd_device *d;
+
+ log_info("/* %s */", __func__);
+
+ assert_se(sd_device_enumerator_new(&e) >= 0);
+ assert_se(sd_device_enumerator_allow_uninitialized(e) >= 0);
+ FOREACH_SUBSYSTEM(e, d)
+ test_sd_device_one(d);
+}
+
+static unsigned test_sd_device_enumerator_filter_subsystem_one(const char *subsystem, Hashmap *h) {
+ _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
+ sd_device *d, *t;
+ unsigned n_new_dev = 0;
+
+ assert_se(sd_device_enumerator_new(&e) >= 0);
+ assert_se(sd_device_enumerator_add_match_subsystem(e, subsystem, true) >= 0);
+
+ FOREACH_DEVICE(e, d) {
+ const char *syspath;
+
+ assert_se(sd_device_get_syspath(d, &syspath) >= 0);
+ t = hashmap_remove(h, syspath);
+ assert_se(!sd_device_unref(t));
+
+ if (t)
+ log_debug("Removed subsystem:%s syspath:%s", subsystem, syspath);
+ else {
+ log_warning("New device found: subsystem:%s syspath:%s", subsystem, syspath);
+ n_new_dev++;
+ }
+ }
+
+ /* Assume no device is unplugged. */
+ assert_se(hashmap_isempty(h));
+
+ return n_new_dev;
+}
+
+static void test_sd_device_enumerator_filter_subsystem(void) {
+ _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
+ _cleanup_(hashmap_freep) Hashmap *subsystems;
+ unsigned n_new_dev = 0;
+ sd_device *d;
+ Hashmap *h;
+ char *s;
+
+ log_info("/* %s */", __func__);
+
+ assert_se(subsystems = hashmap_new(&string_hash_ops));
+ assert_se(sd_device_enumerator_new(&e) >= 0);
+
+ FOREACH_DEVICE(e, d) {
+ const char *syspath, *subsystem;
+ int r;
+
+ assert_se(sd_device_get_syspath(d, &syspath) >= 0);
+
+ r = sd_device_get_subsystem(d, &subsystem);
+ assert_se(r >= 0 || r == -ENOENT);
+ if (r < 0)
+ continue;
+
+ h = hashmap_get(subsystems, subsystem);
+ if (!h) {
+ char *str;
+ assert_se(str = strdup(subsystem));
+ assert_se(h = hashmap_new(&string_hash_ops));
+ assert_se(hashmap_put(subsystems, str, h) >= 0);
+ }
+
+ assert_se(hashmap_put(h, syspath, d) >= 0);
+ assert_se(sd_device_ref(d));
+
+ log_debug("Added subsystem:%s syspath:%s", subsystem, syspath);
+ }
+
+ while ((h = hashmap_steal_first_key_and_value(subsystems, (void**) &s))) {
+ n_new_dev += test_sd_device_enumerator_filter_subsystem_one(s, h);
+ hashmap_free(h);
+ free(s);
+ }
+
+ if (n_new_dev > 0)
+ log_warning("%u new device is found in re-scan", n_new_dev);
+
+ /* Assume that not so many devices are plugged. */
+ assert_se(n_new_dev <= 10);
+}
+
+int main(int argc, char **argv) {
+ test_setup_logging(LOG_INFO);
+
+ test_sd_device_enumerator_devices();
+ test_sd_device_enumerator_subsystems();
+ test_sd_device_enumerator_filter_subsystem();
+
+ return 0;
+}
diff --git a/src/libsystemd/sd-device/test-udev-device-thread.c b/src/libsystemd/sd-device/test-udev-device-thread.c
new file mode 100644
index 0000000..a493152
--- /dev/null
+++ b/src/libsystemd/sd-device/test-udev-device-thread.c
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <pthread.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "libudev.h"
+
+#include "macro.h"
+
+static void* thread(void *p) {
+ struct udev_device **d = p;
+
+ assert_se(!(*d = udev_device_unref(*d)));
+
+ return NULL;
+}
+
+int main(int argc, char *argv[]) {
+ struct udev_device *loopback;
+ pthread_t t;
+
+ assert_se(unsetenv("SYSTEMD_MEMPOOL") == 0);
+
+ assert_se(loopback = udev_device_new_from_syspath(NULL, "/sys/class/net/lo"));
+
+ assert_se(udev_device_get_properties_list_entry(loopback));
+
+ assert_se(pthread_create(&t, NULL, thread, &loopback) == 0);
+ assert_se(pthread_join(t, NULL) == 0);
+
+ assert_se(!loopback);
+
+ return 0;
+}
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