libudev: move to top-level directory

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;
+}