/* * udev-add.c * * Userspace devfs * * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com> * * * 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 version 2 of the License. * * 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, write to the Free Software Foundation, Inc., * 675 Mass Ave, Cambridge, MA 02139, USA. * */ #include <stdlib.h> #include <string.h> #include <stdio.h> #include <fcntl.h> #include <unistd.h> #include <errno.h> #include <sys/stat.h> #include <sys/types.h> #include <grp.h> #include <net/if.h> #include <sys/socket.h> #include <sys/ioctl.h> #include <linux/sockios.h> #include "libsysfs/sysfs/libsysfs.h" #include "udev_libc_wrapper.h" #include "udev.h" #include "udev_utils.h" #include "udev_sysfs.h" #include "udev_version.h" #include "logging.h" #include "udev_rules.h" #include "udev_db.h" #include "udev_selinux.h" int udev_make_node(struct udevice *udev, const char *file, dev_t devt, mode_t mode, uid_t uid, gid_t gid) { struct stat stats; int retval = 0; switch (udev->type) { case DEV_BLOCK: mode |= S_IFBLK; break; case DEV_CLASS: mode |= S_IFCHR; break; default: dbg("unknown node type %c\n", udev->type); return -EINVAL; } if (stat(file, &stats) != 0) goto create; /* preserve node with already correct numbers, to not change the inode number */ if ((stats.st_mode & S_IFMT) == (mode & S_IFMT) && (stats.st_rdev == devt)) { info("preserve file '%s', cause it has correct dev_t", file); selinux_setfilecon(file, udev->kernel_name, stats.st_mode); goto perms; } if (unlink(file) != 0) dbg("unlink(%s) failed with error '%s'", file, strerror(errno)); else dbg("already present file '%s' unlinked", file); create: selinux_setfscreatecon(file, udev->kernel_name, mode); retval = mknod(file, mode, devt); selinux_resetfscreatecon(); if (retval != 0) { err("mknod(%s, %#o, %u, %u) failed with error '%s'", file, mode, major(devt), minor(devt), strerror(errno)); goto exit; } perms: dbg("chmod(%s, %#o)", file, mode); if (chmod(file, mode) != 0) { dbg("chmod(%s, %#o) failed with error '%s'", file, mode, strerror(errno)); goto exit; } if (uid != 0 || gid != 0) { dbg("chown(%s, %u, %u)", file, uid, gid); if (chown(file, uid, gid) != 0) { dbg("chown(%s, %u, %u) failed with error '%s'", file, uid, gid, strerror(errno)); goto exit; } } exit: return retval; } static int create_node(struct udevice *udev, struct sysfs_class_device *class_dev) { char filename[PATH_SIZE]; char partitionname[PATH_SIZE]; struct name_entry *name_loop; uid_t uid; gid_t gid; int tail; int i; snprintf(filename, sizeof(filename), "%s/%s", udev_root, udev->name); filename[sizeof(filename)-1] = '\0'; /* create parent directories if needed */ if (strchr(udev->name, '/')) create_path(filename); if (strcmp(udev->owner, "root") == 0) uid = 0; else { char *endptr; unsigned long id; id = strtoul(udev->owner, &endptr, 10); if (endptr[0] == '\0') uid = (uid_t) id; else uid = lookup_user(udev->owner); } if (strcmp(udev->group, "root") == 0) gid = 0; else { char *endptr; unsigned long id; id = strtoul(udev->group, &endptr, 10); if (endptr[0] == '\0') gid = (gid_t) id; else gid = lookup_group(udev->group); } if (!udev->test_run) { info("creating device node '%s'", filename); if (udev_make_node(udev, filename, udev->devt, udev->mode, uid, gid) != 0) goto error; } else { info("creating device node '%s', major = '%d', minor = '%d', " "mode = '%#o', uid = '%d', gid = '%d'", filename, major(udev->devt), minor(udev->devt), udev->mode, uid, gid); } /* create all_partitions if requested */ if (udev->partitions) { struct sysfs_attribute *attr; int range; /* take the maximum registered minor range */ attr = sysfs_get_classdev_attr(class_dev, "range"); if (attr) { range = atoi(attr->value); if (range > 1) udev->partitions = range-1; } info("creating device partition nodes '%s[1-%i]'", filename, udev->partitions); if (!udev->test_run) { for (i = 1; i <= udev->partitions; i++) { dev_t part_devt; snprintf(partitionname, sizeof(partitionname), "%s%d", filename, i); partitionname[sizeof(partitionname)-1] = '\0'; part_devt = makedev(major(udev->devt), minor(udev->devt) + i); udev_make_node(udev, partitionname, part_devt, udev->mode, uid, gid); } } } /* create symlink(s) if requested */ list_for_each_entry(name_loop, &udev->symlink_list, node) { int retval; char linktarget[PATH_SIZE]; snprintf(filename, sizeof(filename), "%s/%s", udev_root, name_loop->name); filename[sizeof(filename)-1] = '\0'; dbg("symlink '%s' to node '%s' requested", filename, udev->name); if (!udev->test_run) if (strchr(filename, '/')) create_path(filename); /* optimize relative link */ linktarget[0] = '\0'; i = 0; tail = 0; while (udev->name[i] && (udev->name[i] == name_loop->name[i])) { if (udev->name[i] == '/') tail = i+1; i++; } while (name_loop->name[i] != '\0') { if (name_loop->name[i] == '/') strlcat(linktarget, "../", sizeof(linktarget)); i++; } strlcat(linktarget, &udev->name[tail], sizeof(linktarget)); dbg("symlink(%s, %s)", linktarget, filename); if (!udev->test_run) { unlink(filename); selinux_setfscreatecon(filename, NULL, S_IFLNK); retval = symlink(linktarget, filename); selinux_resetfscreatecon(); if (retval != 0) dbg("symlink(%s, %s) failed with error '%s'", linktarget, filename, strerror(errno)); } } return 0; error: return -1; } static int rename_net_if(struct udevice *udev) { int sk; struct ifreq ifr; int retval; info("changing net interface name from '%s' to '%s'", udev->kernel_name, udev->name); if (udev->test_run) return 0; sk = socket(PF_INET, SOCK_DGRAM, 0); if (sk < 0) { dbg("error opening socket"); return -1; } memset(&ifr, 0x00, sizeof(struct ifreq)); strlcpy(ifr.ifr_name, udev->kernel_name, IFNAMSIZ); strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ); retval = ioctl(sk, SIOCSIFNAME, &ifr); if (retval != 0) dbg("error changing net interface name"); close(sk); return retval; } int udev_add_device(struct udevice *udev, struct sysfs_class_device *class_dev) { char *pos; int retval = 0; dbg("adding name='%s'", udev->name); selinux_init(); if (udev->type == DEV_BLOCK || udev->type == DEV_CLASS) { retval = create_node(udev, class_dev); if (retval != 0) goto exit; if (udev_db_add_device(udev) != 0) dbg("udev_db_add_dev failed, but we create the node anyway, " "remove might not work for custom names"); /* use full path to the environment */ snprintf(udev->devname, sizeof(udev->devname), "%s/%s", udev_root, udev->name); udev->devname[sizeof(udev->devname)-1] = '\0'; } else if (udev->type == DEV_NET) { /* look if we want to change the name of the netif */ if (strcmp(udev->name, udev->kernel_name) != 0) { retval = rename_net_if(udev); if (retval != 0) goto exit; /* we've changed the name, now fake the devpath, cause the * original kernel name sleeps with the fishes and we don't * get an event from the kernel with the new name */ pos = strrchr(udev->devpath, '/'); if (pos != NULL) { pos[1] = '\0'; strlcat(udev->devpath, udev->name, sizeof(udev->devpath)); setenv("DEVPATH", udev->devpath, 1); setenv("INTERFACE", udev->name, 1); } /* use netif name for the environment */ strlcpy(udev->devname, udev->name, sizeof(udev->devname)); } } exit: selinux_exit(); return retval; }