X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev%2Fudev-node.c;h=3b4eb5f00bfb5ab18c53ca84ee059f3bd54be8f0;hp=307a76b2712c2cf9f8849e4f2f7ef1f4eab20c88;hb=0ec5b5e1429307fa7573aaa9b8f25fbd9b1d71d5;hpb=455f792e4791e037eb0406005b92c345cf0baf56

diff --git a/udev/udev-node.c b/udev/udev-node.c
index 307a76b27..3b4eb5f00 100644
--- a/udev/udev-node.c
+++ b/udev/udev-node.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2009 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2003-2010 Kay Sievers <kay.sievers@vrfy.org>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -37,7 +37,6 @@ int udev_node_mknod(struct udev_device *dev, const char *file, dev_t devnum, mod
 {
 	struct udev *udev = udev_device_get_udev(dev);
 	struct stat stats;
-	int preserve = 0;
 	int err = 0;
 
 	if (major(devnum) == 0)
@@ -54,9 +53,15 @@ int udev_node_mknod(struct udev_device *dev, const char *file, dev_t devnum, mod
 	if (lstat(file, &stats) == 0) {
 		if (((stats.st_mode & S_IFMT) == (mode & S_IFMT)) && (stats.st_rdev == devnum)) {
 			info(udev, "preserve file '%s', because it has correct dev_t\n", file);
-			preserve = 1;
-			udev_selinux_lsetfilecon(udev, file, mode);
-			/* update time stamp when we re-use the node, like on media change events */
+			if (stats.st_mode != mode || stats.st_uid != uid || stats.st_gid != gid) {
+				info(udev, "set permissions %s, %#o, uid=%u, gid=%u\n", file, mode, uid, gid);
+				chmod(file, mode);
+				chown(file, uid, gid);
+				udev_selinux_lsetfilecon(udev, file, mode);
+			} else {
+				info(udev, "preserve permissions %s, %#o, uid=%u, gid=%u\n", file, mode, uid, gid);
+			}
+			/* always update timestamp when we re-use the node, like on media change events */
 			utimensat(AT_FDCWD, file, NULL, 0);
 		} else {
 			char file_tmp[UTIL_PATH_SIZE + sizeof(TMP_FILE_EXT)];
@@ -76,7 +81,11 @@ int udev_node_mknod(struct udev_device *dev, const char *file, dev_t devnum, mod
 			if (err != 0) {
 				err(udev, "rename(%s, %s) failed: %m\n", file_tmp, file);
 				unlink(file_tmp);
+				goto exit;
 			}
+			info(udev, "set permissions %s, %#o, uid=%u, gid=%u\n", file, mode, uid, gid);
+			chmod(file, mode);
+			chown(file, uid, gid);
 		}
 	} else {
 		info(udev, "mknod(%s, %#o, (%u,%u))\n", file, mode, major(devnum), minor(devnum));
@@ -90,28 +99,11 @@ int udev_node_mknod(struct udev_device *dev, const char *file, dev_t devnum, mod
 				err = -errno;
 			udev_selinux_resetfscreatecon(udev);
 		} while (err == -ENOENT);
-		if (err != 0) {
+		if (err != 0)
 			err(udev, "mknod(%s, %#o, (%u,%u) failed: %m\n", file, mode, major(devnum), minor(devnum));
-			goto exit;
-		}
-	}
-
-	if (!preserve || stats.st_mode != mode) {
-		info(udev, "chmod(%s, %#o)\n", file, mode);
-		err = chmod(file, mode);
-		if (err != 0) {
-			err(udev, "chmod(%s, %#o) failed: %m\n", file, mode);
-			goto exit;
-		}
-	}
-
-	if (!preserve || stats.st_uid != uid || stats.st_gid != gid) {
-		info(udev, "chown(%s, %u, %u)\n", file, uid, gid);
-		err = chown(file, uid, gid);
-		if (err != 0) {
-			err(udev, "chown(%s, %u, %u) failed: %m\n", file, uid, gid);
-			goto exit;
-		}
+		info(udev, "set permissions %s, %#o, uid=%u, gid=%u\n", file, mode, uid, gid);
+		chmod(file, mode);
+		chown(file, uid, gid);
 	}
 exit:
 	return err;
@@ -245,28 +237,26 @@ static const char *link_find_prioritized(struct udev_device *dev, bool add, cons
 	for (;;) {
 		struct udev_device *dev_db;
 		struct dirent *dent;
-		char devpath[UTIL_PATH_SIZE];
-		char syspath[UTIL_PATH_SIZE];
-		ssize_t len;
+		int maj, min;
+		char type, type2;
+		dev_t devnum;
 
 		dent = readdir(dir);
 		if (dent == NULL || dent->d_name[0] == '\0')
 			break;
 		if (dent->d_name[0] == '.')
 			continue;
-		dbg(udev, "found '%s/%s'\n", stackdir, dent->d_name);
-		len = readlinkat(dirfd(dir), dent->d_name, devpath, sizeof(devpath));
-		if (len <= 0 || len == (ssize_t)sizeof(devpath))
+		if (sscanf(dent->d_name, "%c%i:%i", &type, &maj, &min) != 3)
 			continue;
-		devpath[len] = '\0';
-		util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), devpath, NULL);
-		info(udev, "found '%s' claiming '%s'\n", syspath, stackdir);
+		info(udev, "found '%c%i:%i' claiming '%s'\n", type, maj, min, stackdir);
+		devnum = makedev(maj, min);
 
 		/* did we find ourself? */
-		if (strcmp(udev_device_get_syspath(dev), syspath) == 0)
+		type2 = strcmp(udev_device_get_subsystem(dev), "block") == 0 ? 'b' : 'c';
+		if (udev_device_get_devnum(dev) == devnum && type == type2)
 			continue;
 
-		dev_db = udev_device_new_from_syspath(udev, syspath);
+		dev_db = udev_device_new_from_devnum(udev, type, devnum);
 		if (dev_db != NULL) {
 			const char *devnode;
 
@@ -276,7 +266,7 @@ static const char *link_find_prioritized(struct udev_device *dev, bool add, cons
 				    udev_device_get_devnode(dev_db), udev_device_get_devlink_priority(dev_db));
 				if (target == NULL || udev_device_get_devlink_priority(dev_db) > priority) {
 					info(udev, "'%s' claims priority %i for '%s'\n",
-					     syspath, udev_device_get_devlink_priority(dev_db), stackdir);
+					     udev_device_get_syspath(dev_db), udev_device_get_devlink_priority(dev_db), stackdir);
 					priority = udev_device_get_devlink_priority(dev_db);
 					util_strscpy(buf, bufsize, devnode);
 					target = buf;
@@ -328,11 +318,15 @@ static void link_update(struct udev_device *dev, const char *slink, bool add)
 
 		dbg(udev, "creating index: '%s'\n", filename);
 		do {
+			int fd;
+
 			err = util_create_path(udev, filename);
 			if (err != 0 && err != -ENOENT)
 				break;
-			err = symlink(udev_device_get_devpath(dev), filename);
-			if (err != 0)
+			fd = open(filename, O_WRONLY|O_CREAT, 0444);
+			if (fd >= 0)
+				close(fd);
+			else
 				err = -errno;
 		} while (err == -ENOENT);
 	}
@@ -405,7 +399,7 @@ int udev_node_add(struct udev_device *dev, mode_t mode, uid_t uid, gid_t gid)
 
 	/* create/update symlinks, add symlinks to name index */
 	udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(dev)) {
-		if (udev_list_entry_get_flag(list_entry))
+		if (udev_list_entry_get_flags(list_entry))
 			/* simple unmanaged link name */
 			node_symlink(udev, udev_device_get_devnode(dev), udev_list_entry_get_name(list_entry));
 		else
@@ -422,7 +416,6 @@ int udev_node_remove(struct udev_device *dev)
 	const char *devnode;
 	char partitionname[UTIL_PATH_SIZE];
 	struct stat stats;
-	struct udev_device *dev_check;
 	int err = 0;
 	int num;
 
@@ -442,15 +435,21 @@ int udev_node_remove(struct udev_device *dev)
 		return -1;
 	}
 
-	dev_check = udev_device_new_from_syspath(udev, udev_device_get_syspath(dev));
-	if (dev_check != NULL && stats.st_rdev == udev_device_get_devnum(dev_check)) {
-		/* do not remove device node if the same sys-device is re-created in the meantime */
-		info(udev, "keeping device node of existing device'%s'\n", devnode);
+	if (udev_device_get_ignore_remove(dev)) {
+		info(udev, "ignore_remove for '%s'\n", udev_device_get_devnode(dev));
 	} else {
-		info(udev, "removing device node '%s'\n", devnode);
-		err = util_unlink_secure(udev, devnode);
+		struct udev_device *dev_check;
+
+		dev_check = udev_device_new_from_syspath(udev, udev_device_get_syspath(dev));
+		if (dev_check != NULL && stats.st_rdev == udev_device_get_devnum(dev_check)) {
+			/* do not remove device node if the same sys-device is re-created in the meantime */
+			info(udev, "keeping device node of existing device'%s'\n", devnode);
+		} else {
+			info(udev, "removing device node '%s'\n", devnode);
+			err = util_unlink_secure(udev, devnode);
+		}
+		udev_device_unref(dev_check);
 	}
-	udev_device_unref(dev_check);
 
 	num = udev_device_get_num_fake_partitions(dev);
 	if (num > 0) {
@@ -465,6 +464,7 @@ int udev_node_remove(struct udev_device *dev)
 			util_unlink_secure(udev, partitionname);
 		}
 	}
+
 	util_delete_path(udev, devnode);
 	return err;
 }