#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
-
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <grp.h>
+#ifndef __KLIBC__
+#include <pwd.h>
+#endif
+
+#include "libsysfs/sysfs/libsysfs.h"
#include "udev.h"
#include "udev_version.h"
+#include "udev_dbus.h"
+#include "udev_selinux.h"
+#include "logging.h"
#include "namedev.h"
-#include "libsysfs/libsysfs.h"
-
-
-static char sysfs_path[SYSFS_PATH_MAX];
+#include "udevdb.h"
+#include "klibc_fixups.h"
/*
* Right now the major/minor of a device is stored in a file called
* "dev" in sysfs.
* The number is stored as:
- * MMmm
+ * MM:mm
* MM is the major
* mm is the minor
- * The value is in hex.
- * Yes, this will probably change when we go to a bigger major/minor
- * range, and will have to be changed at that time.
+ * The value is in decimal.
*/
-static int get_major_minor(struct sysfs_class_device *class_dev, int *major, int *minor)
+static int get_major_minor(struct sysfs_class_device *class_dev, struct udevice *udev)
{
int retval = -ENODEV;
+ struct sysfs_attribute *attr = NULL;
- char *dev;
-
- dev = sysfs_get_value_from_attributes(class_dev->directory->attributes, "dev");
- if (dev == NULL)
+ attr = sysfs_get_classdev_attr(class_dev, "dev");
+ if (attr == NULL)
goto exit;
+ dbg("dev='%s'", attr->value);
- dbg("dev = %s", dev);
-
- if (sscanf(dev, "%u:%u", major, minor) != 2)
+ if (sscanf(attr->value, "%u:%u", &udev->major, &udev->minor) != 2)
goto exit;
-
- dbg("found major = %d, minor = %d", *major, *minor);
+ dbg("found major=%d, minor=%d", udev->major, udev->minor);
retval = 0;
exit:
return retval;
}
-/*
- * We also want to add some permissions here, and possibly some symlinks
- */
-static int create_node(char *name, char type, int major, int minor, int mode)
+static int create_path(char *file)
{
- char *argv[7];
- char mode_string[100];
- char type_string[3];
- char major_string[20];
- char minor_string[20];
+ 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)) {
+ retval = mkdir(p, 0755);
+ if (retval != 0) {
+ dbg("mkdir(%s) failed with error '%s'",
+ p, strerror(errno));
+ return retval;
+ }
+ dbg("created '%s'", p);
+ }
+ *pos = '/';
+ }
+ return 0;
+}
+
+static int make_node(char *filename, int major, int minor, unsigned int mode, uid_t uid, gid_t gid)
+{
+ int retval;
+
+ retval = mknod(filename, mode, makedev(major, minor));
+ if (retval != 0) {
+ dbg("mknod(%s, %#o, %u, %u) failed with error '%s'",
+ filename, mode, major, minor, strerror(errno));
+ return retval;
+ }
+
+ dbg("chmod(%s, %#o)", filename, mode);
+ retval = chmod(filename, mode);
+ if (retval != 0) {
+ dbg("chmod(%s, %#o) failed with error '%s'",
+ filename, mode, strerror(errno));
+ return retval;
+ }
+
+ if (uid != 0 || gid != 0) {
+ dbg("chown(%s, %u, %u)", filename, uid, gid);
+ retval = chown(filename, uid, gid);
+ if (retval != 0) {
+ dbg("chown(%s, %u, %u) failed with error '%s'",
+ filename, uid, gid, strerror(errno));
+ return retval;
+ }
+ }
+
+ return 0;
+}
+
+static int create_node(struct udevice *dev, int fake)
+{
+ struct stat stats;
char filename[255];
+ char linktarget[255];
+ char partitionname[255];
+ char *linkname;
+ char *symlinks;
int retval = 0;
+ uid_t uid = 0;
+ gid_t gid = 0;
+ int i;
+ int tail;
+
+ 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;
+ }
- strncpy(filename, UDEV_ROOT, sizeof(filename));
- strncat(filename, name, sizeof(filename));
+ /* 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 = getpwnam(dev->owner);
+ if (pw == NULL)
+ dbg("specified user unknown '%s'", dev->owner);
+ else
+ uid = pw->pw_uid;
+ }
+ }
- snprintf(mode_string, sizeof(mode_string), "--mode=%#o", mode);
- snprintf(type_string, sizeof(type_string), "%c", type);
- snprintf(major_string, sizeof(major_string), "%d", major);
- snprintf(minor_string, sizeof(minor_string), "%d", minor);
-
- argv[0] = MKNOD;
- argv[1] = mode_string;
- argv[2] = filename;
- argv[3] = type_string;
- argv[4] = major_string;
- argv[5] = minor_string;
- argv[6] = NULL;
- dbg ("executing %s %s %s %s %s %s",
- argv[0], argv[1], argv[2], argv[3], argv[4], argv[5]);
- switch (fork()) {
- case 0:
- /* we are the child, so lets run the program */
- execv (MKNOD, argv);
- exit(0);
- break;
- case (-1):
- dbg ("fork failed.");
- retval = -EFAULT;
- break;
- default:
- break;
+ 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);
+ make_node(filename, dev->major, dev->minor, dev->mode, uid, gid);
+ } 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 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++) {
+ sprintf(partitionname, "%s%i", filename, i);
+ make_node(partitionname, dev->major,
+ dev->minor + i, dev->mode, uid, gid);
+ }
+ }
}
+
+ if (!fake)
+ selinux_add_node(filename);
+
+ /* create symlink if requested */
+ if (dev->symlink[0] != '\0') {
+ symlinks = dev->symlink;
+ while (1) {
+ linkname = strsep(&symlinks, " ");
+ if (linkname == NULL || linkname[0] == '\0')
+ break;
+
+ 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++;
+ }
+
+ if (linktarget[0] == '\0')
+ strfieldcpy(linktarget, "./");
+ strfieldcat(linktarget, &dev->name[tail]);
+
+ /* unlink existing files to ensure that our symlink is created */
+ if (!fake && (lstat(filename, &stats) == 0)) {
+ if ((stats.st_mode & S_IFMT) != S_IFDIR) {
+ if (unlink(filename))
+ dbg("unlink(%s) failed with error '%s'",
+ filename, strerror(errno));
+ }
+ }
+
+ dbg("symlink(%s, %s)", linktarget, filename);
+ if (!fake) {
+ retval = symlink(linktarget, filename);
+ if (retval != 0)
+ dbg("symlink(%s, %s) failed with error '%s'",
+ linktarget, filename, strerror(errno));
+ }
+ }
+ }
+
return retval;
}
-struct sysfs_class_device *get_class_dev(char *device_name)
+static struct sysfs_class_device *get_class_dev(char *device_name)
{
char dev_path[SYSFS_PATH_MAX];
- struct sysfs_class_device *class_dev;
+ struct sysfs_class_device *class_dev = NULL;
- strcpy(dev_path, sysfs_path);
- strcat(dev_path, device_name);
-
- dbg("looking at %s", dev_path);
+ 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(dev_path);
+ class_dev = sysfs_open_class_device_path(dev_path);
if (class_dev == NULL) {
- dbg ("sysfs_open_class_device failed");
- return NULL;
+ dbg ("sysfs_open_class_device_path failed");
+ goto exit;
}
- dbg("class_dev->name = %s", class_dev->name);
+ dbg("class_dev->name='%s'", class_dev->name);
+exit:
return class_dev;
}
-static int udev_init(void)
+/* 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_DEV 10
+static int sleep_for_dev(char *path)
{
+ char filename[SYSFS_PATH_MAX + 6];
+ int loop = SECONDS_TO_WAIT_FOR_DEV;
int retval;
- retval = sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX);
- dbg("sysfs_path = %s", sysfs_path);
+ strfieldcpy(filename, sysfs_path);
+ strfieldcat(filename, path);
+ strfieldcat(filename, "/dev");
+
+ 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;
}
-int udev_add_device(char *device, char *subsystem)
+int udev_add_device(char *path, char *subsystem, int fake)
{
- struct sysfs_class_device *class_dev;
- struct device_attr attr;
- //char *name;
- int major;
- int minor;
- char type;
- //int mode;
+ struct sysfs_class_device *class_dev = NULL;
+ struct udevice dev;
int retval = -EINVAL;
- /* sleep for a second or two to give the kernel a chance to
- * create the dev file
- */
- sleep(1);
-
- udev_init();
+ memset(&dev, 0x00, sizeof(dev));
/* for now, the block layer is the only place where block devices are */
if (strcmp(subsystem, "block") == 0)
- type = 'b';
+ dev.type = 'b';
else
- type = 'c';
+ dev.type = 'c';
- class_dev = get_class_dev(device);
- if (class_dev == NULL)
+ retval = sleep_for_dev(path);
+ if (retval != 0)
goto exit;
- retval = namedev_name_device(class_dev, &attr);
- if (retval)
- return retval;
+ class_dev = get_class_dev(path);
+ if (class_dev == NULL)
+ goto exit;
- retval = get_major_minor(class_dev, &major, &minor);
- if (retval) {
- dbg ("get_major_minor failed");
+ retval = get_major_minor(class_dev, &dev);
+ if (retval != 0) {
+ dbg("get_major_minor failed");
goto exit;
}
- sysfs_close_class_device(class_dev);
+ retval = namedev_name_device(class_dev, &dev);
+ if (retval != 0)
+ goto exit;
+
+ if (!fake) {
+ retval = udevdb_add_dev(path, &dev);
+ if (retval != 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.");
- return create_node(attr.name, type, major, minor, attr.mode);
+ }
+ dbg("name='%s'", dev.name);
+ retval = create_node(&dev, fake);
+
+ if ((retval == 0) && (!fake))
+ sysbus_send_create(&dev, path);
exit:
+ if (class_dev)
+ sysfs_close_class_device(class_dev);
+
return retval;
}
-
~ianmdlvl / elogind.git / blobdiff