rename udev source files

1 files changed, 525 insertions, 0 deletions

diff --git a/udev/udev-node.c b/udev/udev-node.c
new file mode 100644
index 0000000000..9f2b6cf014
--- /dev/null
+++ b/udev/udev-node.c
@@ -0,0 +1,525 @@
+/*
+ * Copyright (C) 2004-2008 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
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <stddef.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <grp.h>
+#include <dirent.h>
+#include <sys/stat.h>
+#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)
+{
+	char device[UTIL_PATH_SIZE];
+	char filename[UTIL_PATH_SIZE * 2];
+	size_t devlen = strlen(udev_get_dev_path(udev))+1;
+	size_t start;
+	int fd;
+
+	/* directory with device name */
+	util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
+	start = util_strlcat(filename, "/.udev/names/", sizeof(filename));
+	util_strlcat(filename, &name[devlen], sizeof(filename));
+	util_path_encode(&filename[start], sizeof(filename) - start);
+	/* entry with the devpath */
+	util_strlcpy(device, devpath, sizeof(device));
+	util_path_encode(device, sizeof(device));
+	util_strlcat(filename, "/", sizeof(filename));
+	util_strlcat(filename, device, sizeof(filename));
+
+	if (add) {
+		info(udev, "creating index: '%s'\n", filename);
+		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);
+		unlink(filename);
+		delete_path(udev, filename);
+	}
+	return 0;
+}
+
+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)];
+	struct stat stats;
+	int preserve = 0;
+	int err = 0;
+
+	if (major(devnum) == 0)
+		devnum = udev_device_get_devnum(dev);
+
+	if (strcmp(udev_device_get_subsystem(dev), "block") == 0)
+		mode |= S_IFBLK;
+	else
+		mode |= S_IFCHR;
+
+	if (file == NULL)
+		file = udev_device_get_devnode(dev);
+
+	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);
+		} else {
+			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));
+			unlink(file_tmp);
+			udev_selinux_setfscreatecon(udev, file_tmp, mode);
+			err = mknod(file_tmp, mode, devnum);
+			udev_selinux_resetfscreatecon(udev);
+			if (err != 0) {
+				err(udev, "mknod(%s, %#o, %u, %u) failed: %m\n",
+				    file_tmp, mode, major(devnum), minor(devnum));
+				goto exit;
+			}
+			err = rename(file_tmp, file);
+			if (err != 0) {
+				err(udev, "rename(%s, %s) failed: %m\n", file_tmp, file);
+				unlink(file_tmp);
+			}
+		}
+	} else {
+		info(udev, "mknod(%s, %#o, (%u,%u))\n", file, mode, major(devnum), minor(devnum));
+		udev_selinux_setfscreatecon(udev, file, mode);
+		err = mknod(file, mode, devnum);
+		udev_selinux_resetfscreatecon(udev);
+		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;
+		}
+	}
+exit:
+	return err;
+}
+
+static int node_symlink(struct udev *udev, const char *node, const char *slink)
+{
+	struct stat stats;
+	char target[UTIL_PATH_SIZE] = "";
+	char slink_tmp[UTIL_PATH_SIZE + sizeof(TMP_FILE_EXT)];
+	int i = 0;
+	int tail = 0;
+	int len;
+	int err = 0;
+
+	/* use relative link */
+	while (node[i] && (node[i] == slink[i])) {
+		if (node[i] == '/')
+			tail = i+1;
+		i++;
+	}
+	while (slink[i] != '\0') {
+		if (slink[i] == '/')
+			util_strlcat(target, "../", sizeof(target));
+		i++;
+	}
+	util_strlcat(target, &node[tail], sizeof(target));
+
+	/* preserve link with correct target, do not replace node of other device */
+	if (lstat(slink, &stats) == 0) {
+		if (S_ISBLK(stats.st_mode) || S_ISCHR(stats.st_mode)) {
+			struct stat stats2;
+
+			info(udev, "found existing node instead of symlink '%s'\n", slink);
+			if (lstat(node, &stats2) == 0) {
+				if ((stats.st_mode & S_IFMT) == (stats2.st_mode & S_IFMT) &&
+				    stats.st_rdev == stats2.st_rdev) {
+					info(udev, "replace device node '%s' with symlink to our node '%s'\n",
+					     slink, node);
+				} else {
+					err(udev, "device node '%s' already exists, "
+					    "link to '%s' will not overwrite it\n",
+					    slink, node);
+					goto exit;
+				}
+			}
+		} else if (S_ISLNK(stats.st_mode)) {
+			char buf[UTIL_PATH_SIZE];
+
+			info(udev, "found existing symlink '%s'\n", slink);
+			len = readlink(slink, buf, sizeof(buf));
+			if (len > 0) {
+				buf[len] = '\0';
+				if (strcmp(target, buf) == 0) {
+					info(udev, "preserve already existing symlink '%s' to '%s'\n",
+					     slink, target);
+					udev_selinux_lsetfilecon(udev, slink, S_IFLNK);
+					goto exit;
+				}
+			}
+		}
+	} else {
+		info(udev, "creating symlink '%s' to '%s'\n", slink, target);
+		udev_selinux_setfscreatecon(udev, slink, S_IFLNK);
+		err = symlink(target, slink);
+		udev_selinux_resetfscreatecon(udev);
+		if (err == 0)
+			goto exit;
+	}
+
+	info(udev, "atomically replace '%s'\n", slink);
+	util_strlcpy(slink_tmp, slink, sizeof(slink_tmp));
+	util_strlcat(slink_tmp, TMP_FILE_EXT, sizeof(slink_tmp));
+	unlink(slink_tmp);
+	udev_selinux_setfscreatecon(udev, slink, S_IFLNK);
+	err = symlink(target, slink_tmp);
+	udev_selinux_resetfscreatecon(udev);
+	if (err != 0) {
+		err(udev, "symlink(%s, %s) failed: %m\n", target, slink_tmp);
+		goto exit;
+	}
+	err = rename(slink_tmp, slink);
+	if (err != 0) {
+		err(udev, "rename(%s, %s) failed: %m\n", slink_tmp, slink);
+		unlink(slink_tmp);
+		goto exit;
+	}
+exit:
+	return err;
+}
+
+static int get_devices_by_name(struct udev *udev, const char *name, struct list_head *name_list)
+{
+	char dirname[PATH_MAX];
+	size_t devlen = strlen(udev_get_dev_path(udev))+1;
+	size_t start;
+	DIR *dir;
+	int count = 0;
+
+	util_strlcpy(dirname, udev_get_dev_path(udev), sizeof(dirname));
+	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);
+		count = -1;
+		goto out;
+	}
+
+	info(udev, "found index directory '%s'\n", dirname);
+	while (1) {
+		struct dirent *ent;
+		char device[UTIL_PATH_SIZE];
+
+		ent = readdir(dir);
+		if (ent == NULL || ent->d_name[0] == '\0')
+			break;
+		if (ent->d_name[0] == '.')
+			continue;
+
+		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);
+		count++;
+	}
+	closedir(dir);
+out:
+	return count;
+}
+
+static int update_link(struct udev_device *dev, const char *slink, int test)
+{
+	struct udev *udev = udev_device_get_udev(dev);
+	LIST_HEAD(name_list);
+	struct name_entry *device;
+	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));
+
+	count = get_devices_by_name(udev, slink, &name_list);
+	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);
+		}
+		goto out;
+	}
+
+	/* find the device with the highest priority */
+	list_for_each_entry(device, &name_list, node) {
+		struct udev_device *dev_db;
+		const char *devnode;
+
+		info(udev, "found '%s' for '%s'\n", device->name, 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_devnode(dev), slink) == 0) {
+				info(udev, "'%s' is our device node, database inconsistent, skip link update\n",
+				     udev_device_get_devnode(dev));
+			} else if (target[0] == '\0' || udev_device_get_devlink_priority(dev) >= priority) {
+				priority = udev_device_get_devlink_priority(dev);
+				util_strlcpy(target, udev_device_get_devnode(dev), sizeof(target));
+			}
+			continue;
+		}
+
+		/* another device, read priority from database */
+		dev_db = udev_device_new_from_syspath(udev, device->name);
+		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);
+			} else {
+				info(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));
+				}
+			}
+		}
+		udev_device_unref(dev_db);
+	}
+	name_list_cleanup(udev, &name_list);
+
+	if (target[0] == '\0') {
+		info(udev, "no current target for '%s' found\n", slink);
+		rc = 1;
+		goto out;
+	}
+
+	/* 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);
+	}
+out:
+	return rc;
+}
+
+void udev_node_update_old_links(struct udev_device *dev, struct udev_device *dev_old, int test)
+{
+	struct udev *udev = udev_device_get_udev(dev);
+	struct udev_list_entry *list_entry;
+	const char *devnode_old;
+
+	/* update possible left-over symlinks */
+	udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(dev_old)) {
+		struct udev_list_entry *list_entry_current;
+
+		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;
+		}
+		/* 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 the node name has changed, delete the node,
+	 * and possibly restore a symlink of another 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);
+	}
+}
+
+int udev_node_add(struct udev_device *dev, mode_t mode, const char *owner, const char *group, int test)
+{
+	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;
+		}
+
+	/* 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);
+			}
+		}
+	}
+
+	/* add node and to name index */
+	name_index(udev, udev_device_get_devpath(dev), udev_device_get_devnode(dev), 1, test);
+
+	/* 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);
+	}
+exit:
+	return err;
+}
+
+extern int udev_node_remove(struct udev_device *dev, int test)
+{
+	struct udev *udev = udev_device_get_udev(dev);
+	struct udev_list_entry *list_entry;
+	const char *devnode;
+	char partitionname[UTIL_PATH_SIZE];
+	struct stat stats;
+	int err = 0;
+	int num;
+
+	/* remove node from name index */
+	name_index(udev, udev_device_get_devpath(dev), udev_device_get_devnode(dev), 0, test);
+
+	/* 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);
+	}
+
+	devnode = udev_device_get_devnode(dev);
+	if (devnode == NULL)
+		return 0;
+	if (stat(devnode, &stats) != 0) {
+		info(udev, "device node '%s' not found\n", devnode);
+		return 0;
+	}
+	if (stats.st_rdev != udev_device_get_devnum(dev)) {
+		info(udev, "device node '%s' points to a different device, skip removal\n", devnode);
+		return -1;
+	}
+
+	info(udev, "removing device node '%s'\n", devnode);
+	if (!test)
+		err = unlink_secure(udev, devnode);
+	if (err)
+		return err;
+
+	num = udev_device_get_num_fake_partitions(dev);
+	if (num > 0) {
+		int i;
+
+		info(udev, "removing all_partitions '%s[1-%i]'\n", devnode, num);
+		if (num > 255)
+			return -1;
+		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);
+		}
+	}
+	delete_path(udev, devnode);
+	return err;
+}