X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev%2Flib%2Flibudev-enumerate.c;h=e5a4ccee3b62c9c2642cfac6dd6344e7581c444d;hp=ca5e30e4a13a5c4521c08d17bc70859eada87752;hb=b29a5e4ab98f460d2f79a11d1969858640e897e6;hpb=38f27948cdafd8a4b90a6b4f1f54b89891983506

diff --git a/udev/lib/libudev-enumerate.c b/udev/lib/libudev-enumerate.c
index ca5e30e4a..e5a4ccee3 100644
--- a/udev/lib/libudev-enumerate.c
+++ b/udev/lib/libudev-enumerate.c
@@ -24,55 +24,264 @@
 #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_scan_subsystem(struct udev *udev,
-				  const char *basedir, const char *subsystem, const char *subdir,
-				  struct list_head *device_list)
+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 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);
+	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);
+	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, 1, 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, 1, 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;
+}
+
+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 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];
 	DIR *dir;
 	struct dirent *dent;
 
 	util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
-	util_strlcat(path, basedir, sizeof(path));
 	util_strlcat(path, "/", sizeof(path));
-	util_strlcat(path, subsystem, sizeof(path));
-	if (subdir != NULL)
-		util_strlcat(path, subdir, sizeof(path));
+	util_strlcat(path, basedir, sizeof(path));
+	if (subdir1 != NULL) {
+		util_strlcat(path, "/", sizeof(path));
+		util_strlcat(path, subdir1, sizeof(path));
+	}
+	if (subdir2 != NULL) {
+		util_strlcat(path, "/", sizeof(path));
+		util_strlcat(path, subdir2, sizeof(path));
+	}
 	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_strlcpy(syspath, path, sizeof(syspath));
 		util_strlcat(syspath, "/", sizeof(syspath));
 		util_strlcat(syspath, dent->d_name, sizeof(syspath));
-		util_resolve_sys_link(udev, syspath, sizeof(syspath));
-		util_name_list_add(udev, device_list, syspath, NULL, 1);
+		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_strlcpy(filename, syspath, sizeof(filename));
+		util_strlcat(filename, "/uevent", sizeof(filename));
+		if (stat(filename, &statbuf) != 0)
+			continue;
+		if (!match_sysattr(udev_enumerate, syspath))
+			continue;
+		udev_list_entry_add(udev, &udev_enumerate->devices_list, syspath, NULL, 1, 1);
 	}
 	closedir(dir);
 	return 0;
 }
 
-static int devices_scan_subsystems(struct udev *udev,
-				   const char *basedir, const char *subsystem, const char *subdir,
-				   struct list_head *device_list)
+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;
 
-	if (subsystem != NULL)
-		return devices_scan_subsystem(udev, basedir, subsystem, subdir, device_list);
-
 	util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
+	util_strlcat(path, "/", sizeof(path));
 	util_strlcat(path, basedir, sizeof(path));
 	dir = opendir(path);
 	if (dir == NULL)
@@ -80,7 +289,9 @@ static int devices_scan_subsystems(struct udev *udev,
 	for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 		if (dent->d_name[0] == '.')
 			continue;
-		devices_scan_subsystem(udev, basedir, dent->d_name, subdir, device_list);
+		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;
@@ -97,7 +308,6 @@ static int devices_delay(struct udev *udev, const char *syspath)
 	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) {
 			info(udev, "delaying: %s\n", syspath);
@@ -107,73 +317,114 @@ static int devices_delay(struct udev *udev, const char *syspath)
 	return 0;
 }
 
+/* sort delayed devices to the end of the list */
+static int devices_sort(struct udev_enumerate *udev_enumerate)
+{
+	struct udev_list_entry *list_entry;
+
+	udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_enumerate->devices_list)) {
+		if (devices_delay(udev_enumerate->udev, udev_list_entry_get_name(list_entry)))
+			udev_list_entry_move_to_end(list_entry);
+	}
+	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_devices:
- * @udev: udev library context
- * @subsystem: the subsystem to enumerate
- * @cb: function to be called for every device found
- * @data: data to be passed to the function
+ * udev_enumerate_scan_devices:
+ * @udev_enumerate: udev enumeration context
  *
- * Returns: the number of devices passed to the caller, or a negative value on error
+ * Returns: a negative value on error.
  **/
-int udev_enumerate_devices(struct udev *udev, const char *subsystem,
-			   int (*cb)(struct udev_device *udev_device, void *data),
-			   void *data)
+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;
-	struct list_head device_list;
-	struct util_name_entry *loop_device;
-	struct util_name_entry *tmp_device;
-	int cb_rc = 0;
-	int count = 0;
-
-	INIT_LIST_HEAD(&device_list);
+	struct udev_list_entry *list_entry;
 
-	/* if we have /sys/subsystem/, forget all the old stuff */
+	if (udev_enumerate == NULL)
+		return -EINVAL;
 	util_strlcpy(base, udev_get_sys_path(udev), sizeof(base));
 	util_strlcat(base, "/subsystem", sizeof(base));
 	if (stat(base, &statbuf) == 0) {
-		devices_scan_subsystems(udev, "/subsystem", subsystem, "/devices", &device_list);
+		/* we have /subsystem/, forget all the old stuff */
+		info(udev, "searching '/subsystem/*/devices/*' dir\n");
+		scan_dir(udev_enumerate, "subsystem", "devices", NULL);
 	} else {
-		devices_scan_subsystems(udev, "/bus", subsystem, "/devices", &device_list);
-		devices_scan_subsystems(udev, "/class", subsystem, NULL, &device_list);
-	}
-
-	list_for_each_entry_safe(loop_device, tmp_device, &device_list, node) {
-		if (devices_delay(udev, loop_device->name))
-			continue;
-		if (cb_rc == 0) {
-			struct udev_device *device;
-
-			device = udev_device_new_from_syspath(udev, loop_device->name);
-			if (device != NULL) {
-				cb_rc = cb(device, data);
-				count++;
-				udev_device_unref(device);
+		info(udev, "searching '/bus/*/devices/*' dir\n");
+		scan_dir(udev_enumerate, "bus", "devices", NULL);
+		info(udev, "searching '/class/*' dir\n");
+		scan_dir(udev_enumerate, "class", NULL, NULL);
+		/* if block isn't a class, scan /block/ */
+		util_strlcpy(base, udev_get_sys_path(udev), sizeof(base));
+		util_strlcat(base, "/class/block", sizeof(base));
+		if (stat(base, &statbuf) != 0) {
+			if (match_subsystem(udev_enumerate, "block")) {
+				info(udev, "searching '/block/*' dir\n");
+				/* scan disks */
+				scan_dir_and_add_devices(udev_enumerate, "block", NULL, NULL);
+				/* scan partitions */
+				info(udev, "searching '/block/*/*' dir\n");
+				scan_dir(udev_enumerate, "block", NULL, "block");
 			}
 		}
-		list_del(&loop_device->node);
-		free(loop_device->name);
-		free(loop_device);
 	}
+	/* sort delayed devices to the end of the list */
+	udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_enumerate->devices_list)) {
+		if (devices_delay(udev, udev_list_entry_get_name(list_entry)))
+			udev_list_entry_move_to_end(list_entry);
+	}
+	return 0;
+}
 
-	/* handle remaining delayed devices */
-	list_for_each_entry_safe(loop_device, tmp_device, &device_list, node) {
-		if (cb_rc == 0) {
-			struct udev_device *device;
+/**
+ * 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;
 
-			device = udev_device_new_from_syspath(udev, loop_device->name);
-			if (device != NULL) {
-				cb_rc = cb(device, data);
-				count++;
-				udev_device_unref(device);
-			}
-		}
-		list_del(&loop_device->node);
-		free(loop_device->name);
-		free(loop_device);
+	if (udev_enumerate == NULL)
+		return -EINVAL;
+	util_strlcpy(base, udev_get_sys_path(udev), sizeof(base));
+	util_strlcat(base, "/subsystem", sizeof(base));
+	if (stat(base, &statbuf) == 0)
+		subsysdir = "subsystem";
+	else
+		subsysdir = "bus";
+	if (match_subsystem(udev_enumerate, "subsystem")) {
+		info(udev, "searching '%s/*' dir\n", subsysdir);
+		scan_dir_and_add_devices(udev_enumerate, subsysdir, NULL, NULL);
 	}
-
-	return count;
+	if (match_subsystem(udev_enumerate, "drivers")) {
+		info(udev, "searching '%s/*/drivers/*' dir\n", subsysdir);
+		scan_dir(udev_enumerate, subsysdir, "drivers", "drivers");
+	}
+	return 0;
 }