From 8460299b572eb13e7b97a0956b59c053f9009afa Mon Sep 17 00:00:00 2001 From: Kay Sievers Date: Thu, 16 Oct 2008 18:13:48 +0200 Subject: rename udev source files --- udev/udev-node.c | 525 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 525 insertions(+) create mode 100644 udev/udev-node.c (limited to 'udev/udev-node.c') 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 + * + * 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 . + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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; +} -- cgit v1.2.3-54-g00ecf