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-rw-r--r--udev_add.c491
1 files changed, 491 insertions, 0 deletions
diff --git a/udev_add.c b/udev_add.c
new file mode 100644
index 0000000000..e1e145de8a
--- /dev/null
+++ b/udev_add.c
@@ -0,0 +1,491 @@
+/*
+ * 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>
+#ifndef __KLIBC__
+#include <pwd.h>
+#include <utmp.h>
+#endif
+
+#include "libsysfs/sysfs/libsysfs.h"
+#include "udev.h"
+#include "udev_lib.h"
+#include "udev_version.h"
+#include "logging.h"
+#include "namedev.h"
+#include "udevdb.h"
+#include "klibc_fixups.h"
+
+#define LOCAL_USER "$local"
+
+#include "selinux.h"
+
+/*
+ * Right now the major/minor of a device is stored in a file called
+ * "dev" in sysfs.
+ * The number is stored as:
+ * MM:mm
+ * MM is the major
+ * mm is the minor
+ * The value is in decimal.
+ */
+static int get_major_minor(struct sysfs_class_device *class_dev, struct udevice *udev)
+{
+ struct sysfs_attribute *attr = NULL;
+
+ attr = sysfs_get_classdev_attr(class_dev, "dev");
+ if (attr == NULL)
+ goto error;
+ dbg("dev='%s'", attr->value);
+
+ if (sscanf(attr->value, "%u:%u", &udev->major, &udev->minor) != 2)
+ goto error;
+ dbg("found major=%d, minor=%d", udev->major, udev->minor);
+
+ return 0;
+error:
+ return -1;
+}
+
+static int create_path(char *file)
+{
+ char p[NAME_SIZE];
+ char *pos;
+ int retval;
+ struct stat stats;
+
+ strfieldcpy(p, file);
+ pos = strchr(p+1, '/');
+ while (1) {
+ pos = strchr(pos+1, '/');
+ if (pos == NULL)
+ break;
+ *pos = 0x00;
+ if (stat(p, &stats)) {
+ selinux_setfscreatecon(p, S_IFDIR);
+ retval = mkdir(p, 0755);
+ if (retval != 0) {
+ dbg("mkdir(%s) failed with error '%s'",
+ p, strerror(errno));
+ return retval;
+ }
+ dbg("created '%s'", p);
+ } else {
+ selinux_setfilecon(p, S_IFDIR);
+ }
+ *pos = '/';
+ }
+ return 0;
+}
+
+static int make_node(char *file, int major, int minor, unsigned int mode, uid_t uid, gid_t gid)
+{
+ struct stat stats;
+ int retval = 0;
+
+ 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) == S_IFBLK || (stats.st_mode & S_IFMT) == S_IFCHR) &&
+ (stats.st_rdev == makedev(major, minor))) {
+ dbg("preserve file '%s', cause it has correct dev_t", file);
+ selinux_setfilecon(file,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, mode);
+ retval = mknod(file, mode, makedev(major, minor));
+ if (retval != 0) {
+ dbg("mknod(%s, %#o, %u, %u) failed with error '%s'",
+ file, mode, major, minor, 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;
+}
+
+/* get the local logged in user */
+static void set_to_local_user(char *user)
+{
+ struct utmp *u;
+ time_t recent = 0;
+
+ strfieldcpymax(user, default_owner_str, OWNER_SIZE);
+ setutent();
+ while (1) {
+ u = getutent();
+ if (u == NULL)
+ break;
+
+ /* is this a user login ? */
+ if (u->ut_type != USER_PROCESS)
+ continue;
+
+ /* is this a local login ? */
+ if (strcmp(u->ut_host, ""))
+ continue;
+
+ if (u->ut_time > recent) {
+ recent = u->ut_time;
+ strfieldcpymax(user, u->ut_user, OWNER_SIZE);
+ dbg("local user is '%s'", user);
+ break;
+ }
+ }
+ endutent();
+}
+
+static int create_node(struct udevice *dev, int fake)
+{
+ char filename[NAME_SIZE];
+ char linkname[NAME_SIZE];
+ char linktarget[NAME_SIZE];
+ char partitionname[NAME_SIZE];
+ uid_t uid = 0;
+ gid_t gid = 0;
+ int i;
+ int tail;
+ char *pos;
+ int len;
+
+ strfieldcpy(filename, udev_root);
+ strfieldcat(filename, dev->name);
+
+ switch (dev->type) {
+ case 'b':
+ dev->mode |= S_IFBLK;
+ break;
+ case 'c':
+ case 'u':
+ dev->mode |= S_IFCHR;
+ break;
+ case 'p':
+ dev->mode |= S_IFIFO;
+ break;
+ default:
+ dbg("unknown node type %c\n", dev->type);
+ return -EINVAL;
+ }
+
+ /* create parent directories if needed */
+ if (strrchr(dev->name, '/'))
+ create_path(filename);
+
+ if (dev->owner[0] != '\0') {
+ char *endptr;
+ unsigned long id = strtoul(dev->owner, &endptr, 10);
+ if (endptr[0] == '\0')
+ uid = (uid_t) id;
+ else {
+ struct passwd *pw;
+ if (strncmp(dev->owner, LOCAL_USER, sizeof(LOCAL_USER)) == 0)
+ set_to_local_user(dev->owner);
+
+ pw = getpwnam(dev->owner);
+ if (pw == NULL)
+ dbg("specified user unknown '%s'", dev->owner);
+ else
+ uid = pw->pw_uid;
+ }
+ }
+
+ if (dev->group[0] != '\0') {
+ char *endptr;
+ unsigned long id = strtoul(dev->group, &endptr, 10);
+ if (endptr[0] == '\0')
+ gid = (gid_t) id;
+ else {
+ struct group *gr = getgrnam(dev->group);
+ if (gr == NULL)
+ dbg("specified group unknown '%s'", dev->group);
+ else
+ gid = gr->gr_gid;
+ }
+ }
+
+ if (!fake) {
+ info("creating device node '%s'", filename);
+ if (make_node(filename, dev->major, dev->minor, dev->mode, uid, gid) != 0)
+ goto error;
+ } else {
+ info("creating device node '%s', major = '%d', minor = '%d', "
+ "mode = '%#o', uid = '%d', gid = '%d'", filename,
+ dev->major, dev->minor, (mode_t)dev->mode, uid, gid);
+ }
+
+ /* create all_partitions if requested */
+ if (dev->partitions > 0) {
+ info("creating device partition nodes '%s[1-%i]'", filename, dev->partitions);
+ if (!fake) {
+ for (i = 1; i <= dev->partitions; i++) {
+ strfieldcpy(partitionname, filename);
+ strintcat(partitionname, i);
+ make_node(partitionname, dev->major,
+ dev->minor + i, dev->mode, uid, gid);
+ }
+ }
+ }
+
+ /* create symlink(s) if requested */
+ foreach_strpart(dev->symlink, " ", pos, len) {
+ strfieldcpymax(linkname, pos, len+1);
+ strfieldcpy(filename, udev_root);
+ strfieldcat(filename, linkname);
+ dbg("symlink '%s' to node '%s' requested", filename, dev->name);
+ if (!fake)
+ if (strrchr(linkname, '/'))
+ create_path(filename);
+
+ /* optimize relative link */
+ linktarget[0] = '\0';
+ i = 0;
+ tail = 0;
+ while ((dev->name[i] == linkname[i]) && dev->name[i]) {
+ if (dev->name[i] == '/')
+ tail = i+1;
+ i++;
+ }
+ while (linkname[i] != '\0') {
+ if (linkname[i] == '/')
+ strfieldcat(linktarget, "../");
+ i++;
+ }
+
+ strfieldcat(linktarget, &dev->name[tail]);
+
+ dbg("symlink(%s, %s)", linktarget, filename);
+ if (!fake) {
+ selinux_setfscreatecon(filename, S_IFLNK);
+ unlink(filename);
+ if (symlink(linktarget, filename) != 0)
+ dbg("symlink(%s, %s) failed with error '%s'",
+ linktarget, filename, strerror(errno));
+ }
+ }
+
+ return 0;
+error:
+ return -1;
+}
+
+static struct sysfs_class_device *get_class_dev(const char *device_name)
+{
+ char dev_path[SYSFS_PATH_MAX];
+ struct sysfs_class_device *class_dev = NULL;
+
+ strfieldcpy(dev_path, sysfs_path);
+ strfieldcat(dev_path, device_name);
+ dbg("looking at '%s'", dev_path);
+
+ /* open up the sysfs class device for this thing... */
+ class_dev = sysfs_open_class_device_path(dev_path);
+ if (class_dev == NULL) {
+ dbg ("sysfs_open_class_device_path failed");
+ goto exit;
+ }
+ dbg("class_dev->name='%s'", class_dev->name);
+
+exit:
+ return class_dev;
+}
+
+/* wait for the "dev" file to show up in the directory in sysfs.
+ * If it doesn't happen in about 10 seconds, give up.
+ */
+#define SECONDS_TO_WAIT_FOR_FILE 10
+static int sleep_for_file(const char *path, char* file)
+{
+ char filename[SYSFS_PATH_MAX + 6];
+ int loop = SECONDS_TO_WAIT_FOR_FILE;
+ int retval;
+
+ strfieldcpy(filename, sysfs_path);
+ strfieldcat(filename, path);
+ strfieldcat(filename, file);
+
+ while (loop--) {
+ struct stat buf;
+
+ dbg("looking for '%s'", filename);
+ retval = stat(filename, &buf);
+ if (retval == 0)
+ goto exit;
+
+ /* sleep to give the kernel a chance to create the dev file */
+ sleep(1);
+ }
+ retval = -ENODEV;
+exit:
+ return retval;
+}
+
+static int rename_net_if(struct udevice *dev, int fake)
+{
+ int sk;
+ struct ifreq ifr;
+ int retval;
+
+ dbg("changing net interface name from '%s' to '%s'", dev->kernel_name, dev->name);
+ if (fake)
+ return 0;
+
+ sk = socket(PF_INET, SOCK_DGRAM, 0);
+ if (sk < 0) {
+ dbg("error opening socket");
+ return -1;
+ }
+
+ memset(&ifr, 0x00, sizeof(struct ifreq));
+ strfieldcpy(ifr.ifr_name, dev->kernel_name);
+ strfieldcpy(ifr.ifr_newname, dev->name);
+
+ retval = ioctl(sk, SIOCSIFNAME, &ifr);
+ if (retval != 0)
+ dbg("error changing net interface name");
+ close(sk);
+
+ return retval;
+}
+
+int udev_add_device(const char *path, const char *subsystem, int fake)
+{
+ struct sysfs_class_device *class_dev;
+ struct udevice dev;
+ char devpath[DEVPATH_SIZE];
+ char *pos;
+ int retval;
+
+ memset(&dev, 0x00, sizeof(dev));
+
+ dev.type = get_device_type(path, subsystem);
+ switch (dev.type) {
+ case 'b':
+ case 'c':
+ retval = sleep_for_file(path, "/dev");
+ break;
+
+ case 'n':
+ retval = sleep_for_file(path, "/address");
+ break;
+
+ default:
+ dbg("unknown device type '%c'", dev.type);
+ return -1;
+ }
+
+ class_dev = get_class_dev(path);
+ if (class_dev == NULL)
+ return -1;
+
+ if (dev.type == 'b' || dev.type == 'c') {
+ retval = get_major_minor(class_dev, &dev);
+ if (retval != 0) {
+ dbg("get_major_minor failed");
+ goto exit;
+ }
+ }
+
+ if (namedev_name_device(class_dev, &dev) != 0)
+ goto exit;
+
+ dbg("name='%s'", dev.name);
+
+ selinux_init();
+ switch (dev.type) {
+ case 'b':
+ case 'c':
+ retval = create_node(&dev, fake);
+ if (retval != 0)
+ goto exit;
+ if ((!fake) && (udevdb_add_dev(path, &dev) != 0))
+ dbg("udevdb_add_dev failed, but we are going to try "
+ "to create the node anyway. But remove might not "
+ "work properly for this device.");
+
+ dev_d_send(&dev, subsystem, path);
+ break;
+
+ case 'n':
+ strfieldcpy(devpath, path);
+ if (strcmp(dev.name, dev.kernel_name) != 0) {
+ retval = rename_net_if(&dev, fake);
+ if (retval != 0)
+ goto exit;
+ /* netif's are keyed with the configured name, cause
+ * the original kernel name sleeps with the fishes
+ */
+ pos = strrchr(devpath, '/');
+ if (pos != NULL) {
+ pos[1] = '\0';
+ strfieldcat(devpath, dev.name);
+ }
+ }
+ if ((!fake) && (udevdb_add_dev(devpath, &dev) != 0))
+ dbg("udevdb_add_dev failed");
+
+ dev_d_send(&dev, subsystem, devpath);
+ break;
+ }
+
+exit:
+ selinux_restore();
+ sysfs_close_class_device(class_dev);
+
+ return retval;
+}
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