X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev_db.c;h=1feab7d63f961c995748af74cc45733f82e13cd7;hp=13d96894afdd6c9b7cd4effe679285f8f0d1f1b5;hb=4278ab015d76876f61821b293df07e0c3746bfd5;hpb=fc6da921ad3bcb251aa317376e81701700e925c9

diff --git a/udev_db.c b/udev_db.c
index 13d96894a..1feab7d63 100644
--- a/udev_db.c
+++ b/udev_db.c
@@ -31,13 +31,14 @@
 #include <sys/types.h>
 
 #include "udev.h"
+#include "udev_selinux.h"
 
 
 static size_t devpath_to_db_path(const char *devpath, char *filename, size_t len)
 {
 	size_t start;
 
-	/* add location of db files */
+	/* translate to location of db file */
 	strlcpy(filename, udev_root, len);
 	start = strlcat(filename, "/"DB_DIR"/", len);
 	strlcat(filename, devpath, len);
@@ -64,19 +65,69 @@ static int name_index(const char *devpath, const char *name, int add)
 	strlcat(filename, device, sizeof(filename));
 
 	if (add) {
-		dbg("creating: '%s'", filename);
+		info("creating index: '%s'", filename);
 		create_path(filename);
 		fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
 		if (fd > 0)
 			close(fd);
 	} else {
-		dbg("removing: '%s'", filename);
+		info("removing index: '%s'", filename);
 		unlink(filename);
 		delete_path(filename);
 	}
 	return 0;
 }
 
+int udev_db_get_devices_by_name(const char *name, struct list_head *name_list)
+{
+	char dirname[PATH_MAX];
+	size_t start;
+	DIR *dir;
+	int rc = 0;
+
+	strlcpy(dirname, udev_root, sizeof(dirname));
+	start = strlcat(dirname, "/"DB_NAME_INDEX_DIR"/", sizeof(dirname));
+	strlcat(dirname, name, sizeof(dirname));
+	path_encode(&dirname[start], sizeof(dirname) - start);
+
+	dir = opendir(dirname);
+	if (dir == NULL) {
+		info("no index directory '%s': %s", dirname, strerror(errno));
+		rc = -1;
+		goto out;
+	}
+
+	info("found index directory '%s'", dirname);
+	while (1) {
+		struct dirent *ent;
+		char device[PATH_SIZE];
+
+		ent = readdir(dir);
+		if (ent == NULL || ent->d_name[0] == '\0')
+			break;
+		if (ent->d_name[0] == '.')
+			continue;
+
+		strlcpy(device, ent->d_name, sizeof(device));
+		path_decode(device);
+		name_list_add(name_list, device, 0);
+		rc++;
+	}
+	closedir(dir);
+out:
+	return rc;
+}
+
+int udev_db_rename(const char *devpath_old, const char *devpath)
+{
+	char filename[PATH_SIZE];
+	char filename_old[PATH_SIZE];
+
+	devpath_to_db_path(devpath_old, filename_old, sizeof(filename_old));
+	devpath_to_db_path(devpath, filename, sizeof(filename));
+	return rename(filename_old, filename);
+}
+
 int udev_db_add_device(struct udevice *udev)
 {
 	char filename[PATH_SIZE];
@@ -86,25 +137,27 @@ int udev_db_add_device(struct udevice *udev)
 
 	devpath_to_db_path(udev->dev->devpath, filename, sizeof(filename));
 	create_path(filename);
-	name_index(udev->dev->devpath, udev->name, 1);
+	unlink(filename);
 
 	/*
-	 * create only a symlink with the name as the target
-	 * if we don't have any interesting data to remember
+	 * don't waste tmpfs memory pages, if we don't have any data to store
+	 * create fake db-file; store the node-name in a symlink target
 	 */
 	if (list_empty(&udev->symlink_list) && list_empty(&udev->env_list) &&
 	    !udev->partitions && !udev->ignore_remove) {
+		int ret;
 		dbg("nothing interesting to store, create symlink");
-		unlink(filename);
-		if (symlink(udev->name, filename) != 0) {
+		selinux_setfscreatecon(filename, NULL, S_IFLNK);	
+		ret = symlink(udev->name, filename);
+		selinux_resetfscreatecon();
+		if (ret != 0) {
 			err("unable to create db link '%s': %s", filename, strerror(errno));
 			return -1;
 		}
 	} else {
-		struct name_entry *name_loop;
 		FILE *f;
+		struct name_entry *name_loop;
 
-		unlink(filename);
 		f = fopen(filename, "w");
 		if (f == NULL) {
 			err("unable to create db file '%s': %s", filename, strerror(errno));
@@ -115,10 +168,13 @@ int udev_db_add_device(struct udevice *udev)
 		fprintf(f, "N:%s\n", udev->name);
 		list_for_each_entry(name_loop, &udev->symlink_list, node) {
 			fprintf(f, "S:%s\n", name_loop->name);
+			/* add symlink-name to index */
 			name_index(udev->dev->devpath, name_loop->name, 1);
 		}
 		fprintf(f, "M:%u:%u\n", major(udev->devt), minor(udev->devt));
-		if (udev->partitions)
+		if (udev->link_priority != 0)
+			fprintf(f, "L:%u\n", udev->link_priority);
+		if (udev->partitions != 0)
 			fprintf(f, "A:%u\n", udev->partitions);
 		if (udev->ignore_remove)
 			fprintf(f, "R:%u\n", udev->ignore_remove);
@@ -126,6 +182,10 @@ int udev_db_add_device(struct udevice *udev)
 			fprintf(f, "E:%s\n", name_loop->name);
 		fclose(f);
 	}
+
+	/* add name to index */
+	name_index(udev->dev->devpath, udev->name, 1);
+
 	return 0;
 }
 
@@ -141,7 +201,7 @@ int udev_db_get_device(struct udevice *udev, const char *devpath)
 	size_t cur;
 	size_t count;
 
-	strlcpy(udev->dev->devpath, devpath, sizeof(udev->dev->devpath));
+	sysfs_device_set_values(udev->dev, devpath, NULL, NULL);
 	devpath_to_db_path(devpath, filename, sizeof(filename));
 
 	if (lstat(filename, &stats) != 0) {
@@ -198,6 +258,13 @@ int udev_db_get_device(struct udevice *udev, const char *devpath)
 			line[count-2] = '\0';
 			name_list_add(&udev->symlink_list, line, 0);
 			break;
+		case 'L':
+			if (count > sizeof(line))
+				count =  sizeof(line);
+			memcpy(line, &bufline[2], count-2);
+			line[count-2] = '\0';
+			udev->link_priority = atoi(line);
+			break;
 		case 'A':
 			if (count > sizeof(line))
 				count =  sizeof(line);
@@ -234,6 +301,9 @@ int udev_db_delete_device(struct udevice *udev)
 	char filename[PATH_SIZE];
 	struct name_entry *name_loop;
 
+	if (udev->test_run)
+		return 0;
+
 	devpath_to_db_path(udev->dev->devpath, filename, sizeof(filename));
 	unlink(filename);
 
@@ -244,57 +314,6 @@ int udev_db_delete_device(struct udevice *udev)
 	return 0;
 }
 
-int udev_db_lookup_name(const char *name, char *devpath, size_t len)
-{
-	char dirname[PATH_MAX];
-	size_t start;
-	DIR *dir;
-	int found = 0;
-
-	strlcpy(dirname, udev_root, sizeof(dirname));
-	start = strlcat(dirname, "/"DB_NAME_INDEX_DIR"/", sizeof(dirname));
-	strlcat(dirname, name, sizeof(dirname));
-	path_encode(&dirname[start], sizeof(dirname) - start);
-
-	dir = opendir(dirname);
-	if (dir == NULL) {
-		info("no index directory '%s': %s", dirname, strerror(errno));
-		return -1;
-	}
-
-	info("found index directory '%s'", dirname);
-	while (!found) {
-		struct dirent *ent;
-		char device[PATH_SIZE];
-		char filename[PATH_SIZE];
-		struct stat statbuf;
-
-		ent = readdir(dir);
-		if (ent == NULL || ent->d_name[0] == '\0')
-			break;
-		if (ent->d_name[0] == '.')
-			continue;
-
-		strlcpy(device, ent->d_name, sizeof(device));
-		path_decode(device);
-
-		dbg("looking at '%s'", device);
-		strlcpy(filename, sysfs_path, sizeof(filename));
-		strlcat(filename, device, sizeof(filename));
-		if (stat(filename, &statbuf) == 0) {
-			strlcpy(devpath, device, len);
-			found = 1;
-			break;
-		}
-	}
-
-	closedir(dir);
-	if (found)
-		return 0;
-	else
-		return -1;
-}
-
 int udev_db_get_all_entries(struct list_head *name_list)
 {
 	char dbpath[PATH_MAX];