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-rw-r--r--libudev/libudev-enumerate.c479
1 files changed, 479 insertions, 0 deletions
diff --git a/libudev/libudev-enumerate.c b/libudev/libudev-enumerate.c
new file mode 100644
index 0000000000..63f84062b2
--- /dev/null
+++ b/libudev/libudev-enumerate.c
@@ -0,0 +1,479 @@
+/*
+ * libudev - interface to udev device information
+ *
+ * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <dirent.h>
+#include <fnmatch.h>
+#include <sys/stat.h>
+
+#include "libudev.h"
+#include "libudev-private.h"
+
+static int devices_sort(struct udev_enumerate *udev_enumerate);
+
+struct udev_enumerate {
+ struct udev *udev;
+ int refcount;
+ struct udev_list_node sysattr_match_list;
+ struct udev_list_node sysattr_nomatch_list;
+ struct udev_list_node subsystem_match_list;
+ struct udev_list_node subsystem_nomatch_list;
+ struct udev_list_node properties_match_list;
+ struct udev_list_node devices_list;
+ int devices_sorted;
+};
+
+/**
+ * udev_enumerate_new:
+ * @udev: udev library context
+ *
+ * Returns: an enumeration context
+ **/
+struct udev_enumerate *udev_enumerate_new(struct udev *udev)
+{
+ struct udev_enumerate *udev_enumerate;
+
+ udev_enumerate = calloc(1, sizeof(struct udev_enumerate));
+ if (udev_enumerate == NULL)
+ return NULL;
+ udev_enumerate->refcount = 1;
+ udev_enumerate->udev = udev;
+ udev_list_init(&udev_enumerate->devices_list);
+ udev_list_init(&udev_enumerate->sysattr_match_list);
+ udev_list_init(&udev_enumerate->sysattr_nomatch_list);
+ udev_list_init(&udev_enumerate->subsystem_match_list);
+ udev_list_init(&udev_enumerate->subsystem_nomatch_list);
+ udev_list_init(&udev_enumerate->properties_match_list);
+ return udev_enumerate;
+}
+
+struct udev_enumerate *udev_enumerate_ref(struct udev_enumerate *udev_enumerate)
+{
+ if (udev_enumerate == NULL)
+ return NULL;
+ udev_enumerate->refcount++;
+ return udev_enumerate;
+}
+
+void udev_enumerate_unref(struct udev_enumerate *udev_enumerate)
+{
+ if (udev_enumerate == NULL)
+ return;
+ udev_enumerate->refcount--;
+ if (udev_enumerate->refcount > 0)
+ return;
+ udev_list_cleanup_entries(udev_enumerate->udev, &udev_enumerate->devices_list);
+ udev_list_cleanup_entries(udev_enumerate->udev, &udev_enumerate->sysattr_match_list);
+ udev_list_cleanup_entries(udev_enumerate->udev, &udev_enumerate->sysattr_nomatch_list);
+ udev_list_cleanup_entries(udev_enumerate->udev, &udev_enumerate->subsystem_match_list);
+ udev_list_cleanup_entries(udev_enumerate->udev, &udev_enumerate->subsystem_nomatch_list);
+ udev_list_cleanup_entries(udev_enumerate->udev, &udev_enumerate->properties_match_list);
+ free(udev_enumerate);
+}
+
+struct udev *udev_enumerate_get_udev(struct udev_enumerate *udev_enumerate)
+{
+ if (udev_enumerate == NULL)
+ return NULL;
+ return udev_enumerate->udev;
+}
+
+struct udev_list_entry *udev_enumerate_get_list_entry(struct udev_enumerate *udev_enumerate)
+{
+ if (udev_enumerate == NULL)
+ return NULL;
+ if (!udev_enumerate->devices_sorted)
+ devices_sort(udev_enumerate);
+ return udev_list_get_entry(&udev_enumerate->devices_list);
+}
+
+int udev_enumerate_add_match_subsystem(struct udev_enumerate *udev_enumerate, const char *subsystem)
+{
+ if (udev_enumerate == NULL)
+ return -EINVAL;
+ if (subsystem == NULL)
+ return 0;
+ if (udev_list_entry_add(udev_enumerate_get_udev(udev_enumerate),
+ &udev_enumerate->subsystem_match_list, subsystem, NULL, 1, 0) == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+int udev_enumerate_add_nomatch_subsystem(struct udev_enumerate *udev_enumerate, const char *subsystem)
+{
+ if (udev_enumerate == NULL)
+ return -EINVAL;
+ if (subsystem == NULL)
+ return 0;
+ if (udev_list_entry_add(udev_enumerate_get_udev(udev_enumerate),
+ &udev_enumerate->subsystem_nomatch_list, subsystem, NULL, 1, 0) == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+int udev_enumerate_add_match_sysattr(struct udev_enumerate *udev_enumerate, const char *sysattr, const char *value)
+{
+ if (udev_enumerate == NULL)
+ return -EINVAL;
+ if (sysattr == NULL)
+ return 0;
+ if (udev_list_entry_add(udev_enumerate_get_udev(udev_enumerate),
+ &udev_enumerate->sysattr_match_list, sysattr, value, 0, 0) == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+int udev_enumerate_add_nomatch_sysattr(struct udev_enumerate *udev_enumerate, const char *sysattr, const char *value)
+{
+ if (udev_enumerate == NULL)
+ return -EINVAL;
+ if (sysattr == NULL)
+ return 0;
+ if (udev_list_entry_add(udev_enumerate_get_udev(udev_enumerate),
+ &udev_enumerate->sysattr_nomatch_list, sysattr, value, 0, 0) == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+static int match_sysattr_value(struct udev *udev, const char *syspath, const char *sysattr, const char *match_val)
+{
+ struct udev_device *device;
+ const char *val = NULL;
+ int match = 0;
+
+ device = udev_device_new_from_syspath(udev, syspath);
+ if (device == NULL)
+ return -EINVAL;
+ val = udev_device_get_sysattr_value(device, sysattr);
+ if (val == NULL)
+ goto exit;
+ if (match_val == NULL) {
+ match = 1;
+ goto exit;
+ }
+ if (fnmatch(match_val, val, 0) == 0) {
+ match = 1;
+ goto exit;
+ }
+exit:
+ udev_device_unref(device);
+ return match;
+}
+
+int udev_enumerate_add_match_property(struct udev_enumerate *udev_enumerate, const char *property, const char *value)
+{
+ if (udev_enumerate == NULL)
+ return -EINVAL;
+ if (property == NULL)
+ return 0;
+ if (udev_list_entry_add(udev_enumerate_get_udev(udev_enumerate),
+ &udev_enumerate->properties_match_list, property, value, 0, 0) == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+static int match_sysattr(struct udev_enumerate *udev_enumerate, const char *syspath)
+{
+ struct udev *udev = udev_enumerate_get_udev(udev_enumerate);
+ struct udev_list_entry *list_entry;
+
+ /* skip list */
+ udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_enumerate->sysattr_nomatch_list)) {
+ if (match_sysattr_value(udev, syspath,
+ udev_list_entry_get_name(list_entry),
+ udev_list_entry_get_value(list_entry)))
+ return 0;
+ }
+ /* include list */
+ if (udev_list_get_entry(&udev_enumerate->sysattr_match_list) != NULL) {
+ udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_enumerate->sysattr_match_list)) {
+ /* anything that does not match, will make it FALSE */
+ if (!match_sysattr_value(udev, syspath,
+ udev_list_entry_get_name(list_entry),
+ udev_list_entry_get_value(list_entry)))
+ return 0;
+ }
+ return 1;
+ }
+ return 1;
+}
+
+static int match_property(struct udev_enumerate *udev_enumerate, const char *syspath)
+{
+ struct udev_device *dev;
+ struct udev_list_entry *list_entry;
+ int match = 0;
+
+ /* no match always matches */
+ if (udev_list_get_entry(&udev_enumerate->properties_match_list) == NULL)
+ return 1;
+
+ /* no device does not match */
+ dev = udev_device_new_from_syspath(udev_enumerate->udev, syspath);
+ if (dev == NULL)
+ return 0;
+
+ /* loop over matches */
+ udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_enumerate->properties_match_list)) {
+ const char *match_key = udev_list_entry_get_name(list_entry);
+ const char *match_value = udev_list_entry_get_value(list_entry);
+ struct udev_list_entry *property_entry;
+
+ /* loop over device properties */
+ udev_list_entry_foreach(property_entry, udev_device_get_properties_list_entry(dev)) {
+ const char *dev_key = udev_list_entry_get_name(property_entry);
+ const char *dev_value = udev_list_entry_get_value(property_entry);
+
+ if (fnmatch(match_key, dev_key, 0) != 0)
+ continue;
+ if (match_value == NULL && dev_value == NULL) {
+ match = 1;
+ goto out;
+ }
+ if (match_value == NULL || dev_value == NULL)
+ continue;
+ if (fnmatch(match_value, dev_value, 0) == 0) {
+ match = 1;
+ goto out;
+ }
+ }
+ }
+out:
+ udev_device_unref(dev);
+ return match;
+}
+
+static int scan_dir_and_add_devices(struct udev_enumerate *udev_enumerate,
+ const char *basedir, const char *subdir1, const char *subdir2)
+{
+ struct udev *udev = udev_enumerate_get_udev(udev_enumerate);
+ char path[UTIL_PATH_SIZE];
+ size_t l;
+ char *s;
+ DIR *dir;
+ struct dirent *dent;
+
+ s = path;
+ l = util_strpcpyl(&s, sizeof(path), udev_get_sys_path(udev), "/", basedir, NULL);
+ if (subdir1 != NULL)
+ l = util_strpcpyl(&s, l, "/", subdir1, NULL);
+ if (subdir2 != NULL)
+ l = util_strpcpyl(&s, l, "/", subdir2, NULL);
+ dir = opendir(path);
+ if (dir == NULL)
+ return -1;
+ for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
+ char syspath[UTIL_PATH_SIZE];
+ char filename[UTIL_PATH_SIZE];
+ struct stat statbuf;
+
+ if (dent->d_name[0] == '.')
+ continue;
+ util_strscpyl(syspath, sizeof(syspath), path, "/", dent->d_name, NULL);
+ if (lstat(syspath, &statbuf) != 0)
+ continue;
+ if (S_ISREG(statbuf.st_mode))
+ continue;
+ if (S_ISLNK(statbuf.st_mode))
+ util_resolve_sys_link(udev, syspath, sizeof(syspath));
+
+ util_strscpyl(filename, sizeof(filename), syspath, "/uevent", NULL);
+ if (stat(filename, &statbuf) != 0)
+ continue;
+ if (!match_sysattr(udev_enumerate, syspath))
+ continue;
+ if (!match_property(udev_enumerate, syspath))
+ continue;
+ udev_list_entry_add(udev, &udev_enumerate->devices_list, syspath, NULL, 1, 1);
+ }
+ closedir(dir);
+ return 0;
+}
+
+static int match_subsystem(struct udev_enumerate *udev_enumerate, const char *subsystem)
+{
+ struct udev_list_entry *list_entry;
+
+ udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_enumerate->subsystem_nomatch_list)) {
+ if (fnmatch(udev_list_entry_get_name(list_entry), subsystem, 0) == 0)
+ return 0;
+ }
+ if (udev_list_get_entry(&udev_enumerate->subsystem_match_list) != NULL) {
+ udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_enumerate->subsystem_match_list)) {
+ if (fnmatch(udev_list_entry_get_name(list_entry), subsystem, 0) == 0)
+ return 1;
+ }
+ return 0;
+ }
+ return 1;
+}
+
+static int scan_dir(struct udev_enumerate *udev_enumerate, const char *basedir, const char *subdir, const char *subsystem)
+{
+ struct udev *udev = udev_enumerate_get_udev(udev_enumerate);
+
+ char path[UTIL_PATH_SIZE];
+ DIR *dir;
+ struct dirent *dent;
+
+ util_strscpyl(path, sizeof(path), udev_get_sys_path(udev), "/", basedir, NULL);
+ dir = opendir(path);
+ if (dir == NULL)
+ return -1;
+ for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
+ if (dent->d_name[0] == '.')
+ continue;
+ if (!match_subsystem(udev_enumerate, subsystem != NULL ? subsystem : dent->d_name))
+ continue;
+ scan_dir_and_add_devices(udev_enumerate, basedir, dent->d_name, subdir);
+ }
+ closedir(dir);
+ return 0;
+}
+
+static int devices_delay(struct udev *udev, const char *syspath)
+{
+ static const char *delay_device_list[] = {
+ "/block/md",
+ "/block/dm-",
+ NULL
+ };
+ size_t len;
+ int i;
+
+ len = strlen(udev_get_sys_path(udev));
+ for (i = 0; delay_device_list[i] != NULL; i++) {
+ if (strstr(&syspath[len], delay_device_list[i]) != NULL) {
+ dbg(udev, "delaying: %s\n", syspath);
+ return 1;
+ }
+ }
+ return 0;
+}
+
+/* sort delayed devices to the end of the list */
+static int devices_sort(struct udev_enumerate *udev_enumerate)
+{
+ struct udev_list_entry *entry_loop;
+ struct udev_list_entry *entry_tmp;
+ struct udev_list_node devices_list;
+
+ udev_list_init(&devices_list);
+ /* move delayed to delay list */
+ udev_list_entry_foreach_safe(entry_loop, entry_tmp, udev_list_get_entry(&udev_enumerate->devices_list)) {
+ if (devices_delay(udev_enumerate->udev, udev_list_entry_get_name(entry_loop))) {
+ udev_list_entry_remove(entry_loop);
+ udev_list_entry_append(entry_loop, &devices_list);
+ }
+ }
+ /* move delayed back to end of list */
+ udev_list_entry_foreach_safe(entry_loop, entry_tmp, udev_list_get_entry(&devices_list)) {
+ udev_list_entry_remove(entry_loop);
+ udev_list_entry_append(entry_loop, &udev_enumerate->devices_list);
+ }
+ udev_enumerate->devices_sorted = 1;
+ return 0;
+}
+
+int udev_enumerate_add_syspath(struct udev_enumerate *udev_enumerate, const char *syspath)
+{
+ struct udev *udev = udev_enumerate_get_udev(udev_enumerate);
+ struct udev_device *udev_device;
+
+ if (udev_enumerate == NULL)
+ return -EINVAL;
+ if (syspath == NULL)
+ return 0;
+ /* resolve to real syspath */
+ udev_device = udev_device_new_from_syspath(udev_enumerate->udev, syspath);
+ if (udev_device == NULL)
+ return -EINVAL;
+ udev_list_entry_add(udev, &udev_enumerate->devices_list,
+ udev_device_get_syspath(udev_device), NULL, 1, 1);
+ udev_device_unref(udev_device);
+ return 0;
+}
+
+/**
+ * udev_enumerate_scan_devices:
+ * @udev_enumerate: udev enumeration context
+ *
+ * Returns: a negative value on error.
+ **/
+int udev_enumerate_scan_devices(struct udev_enumerate *udev_enumerate)
+{
+ struct udev *udev = udev_enumerate_get_udev(udev_enumerate);
+ char base[UTIL_PATH_SIZE];
+ struct stat statbuf;
+
+ if (udev_enumerate == NULL)
+ return -EINVAL;
+ util_strscpyl(base, sizeof(base), udev_get_sys_path(udev), "/subsystem", NULL);
+ if (stat(base, &statbuf) == 0) {
+ /* we have /subsystem/, forget all the old stuff */
+ dbg(udev, "searching '/subsystem/*/devices/*' dir\n");
+ scan_dir(udev_enumerate, "subsystem", "devices", NULL);
+ } else {
+ dbg(udev, "searching '/bus/*/devices/*' dir\n");
+ scan_dir(udev_enumerate, "bus", "devices", NULL);
+ dbg(udev, "searching '/class/*' dir\n");
+ scan_dir(udev_enumerate, "class", NULL, NULL);
+ /* if block isn't a class, scan /block/ */
+ util_strscpyl(base, sizeof(base), udev_get_sys_path(udev), "/class/block", NULL);
+ if (stat(base, &statbuf) != 0) {
+ if (match_subsystem(udev_enumerate, "block")) {
+ dbg(udev, "searching '/block/*' dir\n");
+ /* scan disks */
+ scan_dir_and_add_devices(udev_enumerate, "block", NULL, NULL);
+ /* scan partitions */
+ dbg(udev, "searching '/block/*/*' dir\n");
+ scan_dir(udev_enumerate, "block", NULL, "block");
+ }
+ }
+ }
+ return 0;
+}
+
+/**
+ * udev_enumerate_scan_subsystems:
+ * @udev_enumerate: udev enumeration context
+ *
+ * Returns: a negative value on error.
+ **/
+int udev_enumerate_scan_subsystems(struct udev_enumerate *udev_enumerate)
+{
+ struct udev *udev = udev_enumerate_get_udev(udev_enumerate);
+ char base[UTIL_PATH_SIZE];
+ struct stat statbuf;
+ const char *subsysdir;
+
+ if (udev_enumerate == NULL)
+ return -EINVAL;
+ util_strscpyl(base, sizeof(base), udev_get_sys_path(udev), "/subsystem", NULL);
+ if (stat(base, &statbuf) == 0)
+ subsysdir = "subsystem";
+ else
+ subsysdir = "bus";
+ if (match_subsystem(udev_enumerate, "subsystem")) {
+ dbg(udev, "searching '%s/*' dir\n", subsysdir);
+ scan_dir_and_add_devices(udev_enumerate, subsysdir, NULL, NULL);
+ }
+ if (match_subsystem(udev_enumerate, "drivers")) {
+ dbg(udev, "searching '%s/*/drivers/*' dir\n", subsysdir);
+ scan_dir(udev_enumerate, subsysdir, "drivers", "drivers");
+ }
+ return 0;
+}