X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev%2Fudev-node.c;h=965017240cf9b4bcb8f8358726c5c8c76733420b;hp=9f2b6cf0146d90afa6eccf5b5900a887e78cb117;hb=540f46698dd5a3bed767fa1c761ead1c9e41ed2e;hpb=8460299b572eb13e7b97a0956b59c053f9009afa

diff --git a/udev/udev-node.c b/udev/udev-node.c
index 9f2b6cf01..965017240 100644
--- a/udev/udev-node.c
+++ b/udev/udev-node.c
@@ -28,12 +28,11 @@
 #include <sys/types.h>
 
 #include "udev.h"
-#include "udev-rules.h"
 
 #define TMP_FILE_EXT		".udev-tmp"
 
 /* reverse mapping from the device file name to the devpath */
-static int name_index(struct udev *udev, const char *devpath, const char *name, int add, int test)
+static int name_index(struct udev *udev, const char *devpath, const char *name, int add)
 {
 	char device[UTIL_PATH_SIZE];
 	char filename[UTIL_PATH_SIZE * 2];
@@ -53,15 +52,15 @@ static int name_index(struct udev *udev, const char *devpath, const char *name,
 	util_strlcat(filename, device, sizeof(filename));
 
 	if (add) {
-		info(udev, "creating index: '%s'\n", filename);
-		create_path(udev, filename);
+		dbg(udev, "creating index: '%s'\n", filename);
+		util_create_path(udev, filename);
 		fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
 		if (fd > 0)
 			close(fd);
 	} else {
-		info(udev, "removing index: '%s'\n", filename);
+		dbg(udev, "removing index: '%s'\n", filename);
 		unlink(filename);
-		delete_path(udev, filename);
+		util_delete_path(udev, filename);
 	}
 	return 0;
 }
@@ -69,7 +68,7 @@ static int name_index(struct udev *udev, const char *devpath, const char *name,
 int udev_node_mknod(struct udev_device *dev, const char *file, dev_t devnum, mode_t mode, uid_t uid, gid_t gid)
 {
 	struct udev *udev = udev_device_get_udev(dev);
-	char file_tmp[UTIL_PATH_SIZE + sizeof(TMP_FILE_EXT)];
+	char filename[UTIL_PATH_SIZE];
 	struct stat stats;
 	int preserve = 0;
 	int err = 0;
@@ -82,8 +81,14 @@ int udev_node_mknod(struct udev_device *dev, const char *file, dev_t devnum, mod
 	else
 		mode |= S_IFCHR;
 
-	if (file == NULL)
+	if (file == NULL) {
 		file = udev_device_get_devnode(dev);
+	} else if (file[0] != '/') {
+		util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
+		util_strlcat(filename, "/", sizeof(filename));
+		util_strlcat(filename, file, sizeof(filename));
+		file = filename;
+	}
 
 	if (lstat(file, &stats) == 0) {
 		if (((stats.st_mode & S_IFMT) == (mode & S_IFMT)) && (stats.st_rdev == devnum)) {
@@ -91,6 +96,8 @@ int udev_node_mknod(struct udev_device *dev, const char *file, dev_t devnum, mod
 			preserve = 1;
 			udev_selinux_lsetfilecon(udev, file, mode);
 		} else {
+			char file_tmp[UTIL_PATH_SIZE + sizeof(TMP_FILE_EXT)];
+
 			info(udev, "atomically replace existing file '%s'\n", file);
 			util_strlcpy(file_tmp, file, sizeof(file_tmp));
 			util_strlcat(file_tmp, TMP_FILE_EXT, sizeof(file_tmp));
@@ -144,7 +151,7 @@ exit:
 static int node_symlink(struct udev *udev, const char *node, const char *slink)
 {
 	struct stat stats;
-	char target[UTIL_PATH_SIZE] = "";
+	char target[UTIL_PATH_SIZE];
 	char slink_tmp[UTIL_PATH_SIZE + sizeof(TMP_FILE_EXT)];
 	int i = 0;
 	int tail = 0;
@@ -152,6 +159,7 @@ static int node_symlink(struct udev *udev, const char *node, const char *slink)
 	int err = 0;
 
 	/* use relative link */
+	target[0] = '\0';
 	while (node[i] && (node[i] == slink[i])) {
 		if (node[i] == '/')
 			tail = i+1;
@@ -185,7 +193,7 @@ static int node_symlink(struct udev *udev, const char *node, const char *slink)
 		} else if (S_ISLNK(stats.st_mode)) {
 			char buf[UTIL_PATH_SIZE];
 
-			info(udev, "found existing symlink '%s'\n", slink);
+			dbg(udev, "found existing symlink '%s'\n", slink);
 			len = readlink(slink, buf, sizeof(buf));
 			if (len > 0) {
 				buf[len] = '\0';
@@ -227,7 +235,7 @@ exit:
 	return err;
 }
 
-static int get_devices_by_name(struct udev *udev, const char *name, struct list_head *name_list)
+static int name_index_get_devices(struct udev *udev, const char *name, struct udev_list_node *dev_list)
 {
 	char dirname[PATH_MAX];
 	size_t devlen = strlen(udev_get_dev_path(udev))+1;
@@ -239,15 +247,14 @@ static int get_devices_by_name(struct udev *udev, const char *name, struct list_
 	start = util_strlcat(dirname, "/.udev/names/", sizeof(dirname));
 	util_strlcat(dirname, &name[devlen], sizeof(dirname));
 	util_path_encode(&dirname[start], sizeof(dirname) - start);
-
 	dir = opendir(dirname);
 	if (dir == NULL) {
-		info(udev, "no index directory '%s': %m\n", dirname);
+		dbg(udev, "no index directory '%s': %m\n", dirname);
 		count = -1;
 		goto out;
 	}
+	dbg(udev, "found index directory '%s'\n", dirname);
 
-	info(udev, "found index directory '%s'\n", dirname);
 	while (1) {
 		struct dirent *ent;
 		char device[UTIL_PATH_SIZE];
@@ -261,7 +268,7 @@ static int get_devices_by_name(struct udev *udev, const char *name, struct list_
 		util_strlcpy(device, udev_get_sys_path(udev), sizeof(device));
 		util_strlcat(device, ent->d_name, sizeof(device));
 		util_path_decode(device);
-		name_list_add(udev, name_list, device, 0);
+		udev_list_entry_add(udev, dev_list, device, NULL, 1, 0);
 		count++;
 	}
 	closedir(dir);
@@ -269,42 +276,45 @@ out:
 	return count;
 }
 
-static int update_link(struct udev_device *dev, const char *slink, int test)
+static int update_link(struct udev_device *dev, const char *slink)
 {
 	struct udev *udev = udev_device_get_udev(dev);
-	LIST_HEAD(name_list);
-	struct name_entry *device;
-	char target[UTIL_PATH_SIZE] = "";
+	struct udev_list_node dev_list;
+	struct udev_list_entry *dev_entry;
+	char target[UTIL_PATH_SIZE];
 	int count;
 	int priority = 0;
 	int rc = 0;
 
-	info(udev, "update symlink '%s' of '%s'\n", slink, udev_device_get_syspath(dev));
+	dbg(udev, "update symlink '%s' of '%s'\n", slink, udev_device_get_syspath(dev));
 
-	count = get_devices_by_name(udev, slink, &name_list);
-	info(udev, "found %i devices with name '%s'\n", count, slink);
+	udev_list_init(&dev_list);
+	count = name_index_get_devices(udev, slink, &dev_list);
+	if (count > 1)
+		info(udev, "found %i devices with name '%s'\n", count, slink);
 
 	/* if we don't have a reference, delete it */
 	if (count <= 0) {
 		info(udev, "no reference left, remove '%s'\n", slink);
-		if (!test) {
-			unlink(slink);
-			delete_path(udev, slink);
-		}
+		unlink(slink);
+		util_delete_path(udev, slink);
 		goto out;
 	}
 
 	/* find the device with the highest priority */
-	list_for_each_entry(device, &name_list, node) {
+	target[0] = '\0';
+	udev_list_entry_foreach(dev_entry, udev_list_get_entry(&dev_list)) {
+		const char *syspath;
 		struct udev_device *dev_db;
 		const char *devnode;
 
-		info(udev, "found '%s' for '%s'\n", device->name, slink);
+		syspath = udev_list_entry_get_name(dev_entry);
+		dbg(udev, "found '%s' for '%s'\n", syspath, slink);
 
 		/* did we find ourself? we win, if we have the same priority */
-		if (strcmp(udev_device_get_syspath(dev), device->name) == 0) {
-			info(udev, "compare (our own) priority of '%s' %i >= %i\n",
-			     udev_device_get_devpath(dev), udev_device_get_devlink_priority(dev), priority);
+		if (strcmp(udev_device_get_syspath(dev), syspath) == 0) {
+			dbg(udev, "compare (our own) priority of '%s' %i >= %i\n",
+			    udev_device_get_devpath(dev), udev_device_get_devlink_priority(dev), priority);
 			if (strcmp(udev_device_get_devnode(dev), slink) == 0) {
 				info(udev, "'%s' is our device node, database inconsistent, skip link update\n",
 				     udev_device_get_devnode(dev));
@@ -316,19 +326,19 @@ static int update_link(struct udev_device *dev, const char *slink, int test)
 		}
 
 		/* another device, read priority from database */
-		dev_db = udev_device_new_from_syspath(udev, device->name);
+		dev_db = udev_device_new_from_syspath(udev, syspath);
 		if (dev_db == NULL)
 			continue;
 		devnode = udev_device_get_devnode(dev_db);
 		if (devnode != NULL) {
 			if (strcmp(devnode, slink) == 0) {
 				info(udev, "'%s' is a device node of '%s', skip link update\n",
-				     devnode, device->name);
+				     devnode, syspath);
 			} else {
-				info(udev, "compare priority of '%s' %i > %i\n",
-				     udev_device_get_devpath(dev_db),
-				     udev_device_get_devlink_priority(dev_db),
-				     priority);
+				dbg(udev, "compare priority of '%s' %i > %i\n",
+				    udev_device_get_devpath(dev_db),
+				    udev_device_get_devlink_priority(dev_db),
+				    priority);
 				if (target[0] == '\0' || udev_device_get_devlink_priority(dev_db) > priority) {
 					priority = udev_device_get_devlink_priority(dev_db);
 					util_strlcpy(target, devnode, sizeof(target));
@@ -337,7 +347,7 @@ static int update_link(struct udev_device *dev, const char *slink, int test)
 		}
 		udev_device_unref(dev_db);
 	}
-	name_list_cleanup(udev, &name_list);
+	udev_list_cleanup_entries(udev, &dev_list);
 
 	if (target[0] == '\0') {
 		info(udev, "no current target for '%s' found\n", slink);
@@ -347,15 +357,13 @@ static int update_link(struct udev_device *dev, const char *slink, int test)
 
 	/* create symlink to the target with the highest priority */
 	info(udev, "'%s' with target '%s' has the highest priority %i, create it\n", slink, target, priority);
-	if (!test) {
-		create_path(udev, slink);
-		node_symlink(udev, target, slink);
-	}
+	util_create_path(udev, slink);
+	node_symlink(udev, target, slink);
 out:
 	return rc;
 }
 
-void udev_node_update_old_links(struct udev_device *dev, struct udev_device *dev_old, int test)
+void udev_node_update_old_links(struct udev_device *dev, struct udev_device *dev_old)
 {
 	struct udev *udev = udev_device_get_udev(dev);
 	struct udev_list_entry *list_entry;
@@ -363,113 +371,98 @@ void udev_node_update_old_links(struct udev_device *dev, struct udev_device *dev
 
 	/* update possible left-over symlinks */
 	udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(dev_old)) {
+		const char *name = udev_list_entry_get_name(list_entry);
 		struct udev_list_entry *list_entry_current;
+		int found;
+
+		/* check if old link name is now our node name */
+		if (strcmp(name, udev_device_get_devnode(dev)) == 0)
+			continue;
 
+		/* check if old link name still belongs to this device */
+		found = 0;
 		udev_list_entry_foreach(list_entry_current, udev_device_get_devlinks_list_entry(dev)) {
-			if (strcmp(udev_list_entry_get_name(list_entry_current),
-				   udev_list_entry_get_name(list_entry)) == 0)
-				continue;
+			const char *name_current = udev_list_entry_get_name(list_entry_current);
+
+			if (strcmp(name, name_current) == 0) {
+				found = 1;
+				break;
+			}
 		}
-		/* link does no longer belong to this device */
-		info(udev, "update old symlink '%s' no longer belonging to '%s'\n",
-		     udev_list_entry_get_name(list_entry), udev_device_get_devpath(dev));
-		update_link(dev, udev_list_entry_get_name(list_entry), test);
+		if (found)
+			continue;
+
+		info(udev, "update old name, '%s' no longer belonging to '%s'\n",
+		     name, udev_device_get_devpath(dev));
+		name_index(udev, udev_device_get_devpath(dev), name, 0);
+		update_link(dev, name);
 	}
 
 	/*
 	 * if the node name has changed, delete the node,
-	 * and possibly restore a symlink of another device
+	 * and possibly restore a symlink of a different device
 	 */
 	devnode_old = udev_device_get_devnode(dev_old);
 	if (devnode_old != NULL) {
 		const char *devnode = udev_device_get_devnode(dev);
 
-		if (devnode != NULL && strcmp(devnode_old, devnode) != 0)
-			update_link(dev, devnode_old, test);
+		if (devnode != NULL && strcmp(devnode_old, devnode) != 0) {
+			info(udev, "node has changed from '%s' to '%s'\n", devnode_old, devnode);
+			name_index(udev, udev_device_get_devpath(dev), devnode_old, 0);
+			update_link(dev, devnode_old);
+		}
 	}
 }
 
-int udev_node_add(struct udev_device *dev, mode_t mode, const char *owner, const char *group, int test)
+int udev_node_add(struct udev_device *dev, mode_t mode, uid_t uid, gid_t gid)
 {
 	struct udev *udev = udev_device_get_udev(dev);
-	uid_t uid;
-	gid_t gid;
 	int i;
 	int num;
 	struct udev_list_entry *list_entry;
 	int err = 0;
 
-	create_path(udev, udev_device_get_devnode(dev));
-
-	if (strcmp(owner, "root") == 0)
-		uid = 0;
-	else {
-		char *endptr;
-		unsigned long id;
-
-		id = strtoul(owner, &endptr, 10);
-		if (endptr[0] == '\0')
-			uid = (uid_t) id;
-		else
-			uid = lookup_user(udev, owner);
-	}
-
-	if (strcmp(group, "root") == 0)
-		gid = 0;
-	else {
-		char *endptr;
-		unsigned long id;
-
-		id = strtoul(group, &endptr, 10);
-		if (endptr[0] == '\0')
-			gid = (gid_t) id;
-		else
-			gid = lookup_group(udev, group);
-	}
-
 	info(udev, "creating device node '%s', devnum=%d:%d, mode=%#o, uid=%d, gid=%d\n",
 	     udev_device_get_devnode(dev),
 	     major(udev_device_get_devnum(dev)), minor(udev_device_get_devnum(dev)),
 	     mode, uid, gid);
 
-	if (!test)
-		if (udev_node_mknod(dev, NULL, makedev(0,0), mode, uid, gid) != 0) {
-			err = -1;
-			goto exit;
-		}
+	util_create_path(udev, udev_device_get_devnode(dev));
+	if (udev_node_mknod(dev, NULL, makedev(0,0), mode, uid, gid) != 0) {
+		err = -1;
+		goto exit;
+	}
 
 	/* create all_partitions if requested */
 	num = udev_device_get_num_fake_partitions(dev);
 	if (num > 0) {
 		info(udev, "creating device partition nodes '%s[1-%i]'\n", udev_device_get_devnode(dev), num);
-		if (!test) {
-			for (i = 1; i <= num; i++) {
-				char partitionname[UTIL_PATH_SIZE];
-				dev_t part_devnum;
-
-				snprintf(partitionname, sizeof(partitionname), "%s%d",
-					 udev_device_get_devnode(dev), i);
-				partitionname[sizeof(partitionname)-1] = '\0';
-				part_devnum = makedev(major(udev_device_get_devnum(dev)),
-						    minor(udev_device_get_devnum(dev)) + i);
-				udev_node_mknod(dev, partitionname, part_devnum, mode, uid, gid);
-			}
+		for (i = 1; i <= num; i++) {
+			char partitionname[UTIL_PATH_SIZE];
+			dev_t part_devnum;
+
+			snprintf(partitionname, sizeof(partitionname), "%s%d",
+				 udev_device_get_devnode(dev), i);
+			partitionname[sizeof(partitionname)-1] = '\0';
+			part_devnum = makedev(major(udev_device_get_devnum(dev)),
+					    minor(udev_device_get_devnum(dev)) + i);
+			udev_node_mknod(dev, partitionname, part_devnum, mode, uid, gid);
 		}
 	}
 
-	/* add node and to name index */
-	name_index(udev, udev_device_get_devpath(dev), udev_device_get_devnode(dev), 1, test);
+	/* add node to name index */
+	name_index(udev, udev_device_get_devpath(dev), udev_device_get_devnode(dev), 1);
 
 	/* create/update symlinks, add symlinks to name index */
 	udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(dev)) {
-		name_index(udev, udev_device_get_devpath(dev), udev_list_entry_get_name(list_entry), 1, test);
-		update_link(dev, udev_list_entry_get_name(list_entry), test);
+		name_index(udev, udev_device_get_devpath(dev), udev_list_entry_get_name(list_entry), 1);
+		update_link(dev, udev_list_entry_get_name(list_entry));
 	}
 exit:
 	return err;
 }
 
-extern int udev_node_remove(struct udev_device *dev, int test)
+extern int udev_node_remove(struct udev_device *dev)
 {
 	struct udev *udev = udev_device_get_udev(dev);
 	struct udev_list_entry *list_entry;
@@ -480,12 +473,12 @@ extern int udev_node_remove(struct udev_device *dev, int test)
 	int num;
 
 	/* remove node from name index */
-	name_index(udev, udev_device_get_devpath(dev), udev_device_get_devnode(dev), 0, test);
+	name_index(udev, udev_device_get_devpath(dev), udev_device_get_devnode(dev), 0);
 
 	/* remove,update symlinks, remove symlinks from name index */
 	udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(dev)) {
-		name_index(udev, udev_device_get_devpath(dev), udev_list_entry_get_name(list_entry), 0, test);
-		update_link(dev, udev_list_entry_get_name(list_entry), test);
+		name_index(udev, udev_device_get_devpath(dev), udev_list_entry_get_name(list_entry), 0);
+		update_link(dev, udev_list_entry_get_name(list_entry));
 	}
 
 	devnode = udev_device_get_devnode(dev);
@@ -501,8 +494,7 @@ extern int udev_node_remove(struct udev_device *dev, int test)
 	}
 
 	info(udev, "removing device node '%s'\n", devnode);
-	if (!test)
-		err = unlink_secure(udev, devnode);
+	err = util_unlink_secure(udev, devnode);
 	if (err)
 		return err;
 
@@ -516,10 +508,9 @@ extern int udev_node_remove(struct udev_device *dev, int test)
 		for (i = 1; i <= num; i++) {
 			snprintf(partitionname, sizeof(partitionname), "%s%d", devnode, i);
 			partitionname[sizeof(partitionname)-1] = '\0';
-			if (!test)
-				unlink_secure(udev, partitionname);
+			util_unlink_secure(udev, partitionname);
 		}
 	}
-	delete_path(udev, devnode);
+	util_delete_path(udev, devnode);
 	return err;
 }