|
|
/* $OpenBSD: readlabel.c,v 1.13 2015/01/16 16:48:52 deraadt Exp $ */
|
|
|
|
|
|
/*
|
|
|
* Copyright (c) 1996, Jason Downs. All rights reserved.
|
|
|
*
|
|
|
* Redistribution and use in source and binary forms, with or without
|
|
|
* modification, are permitted provided that the following conditions
|
|
|
* are met:
|
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
|
* notice, this list of conditions and the following disclaimer.
|
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
|
* documentation and/or other materials provided with the distribution.
|
|
|
*
|
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS
|
|
|
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
|
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
|
|
|
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
|
* SUCH DAMAGE.
|
|
|
*/
|
|
|
|
|
|
#include <sys/types.h>
|
|
|
#include <sys/disk.h>
|
|
|
#include <sys/dkio.h>
|
|
|
#define DKTYPENAMES
|
|
|
#include <sys/disklabel.h>
|
|
|
#include <sys/ioctl.h>
|
|
|
#include <sys/stat.h>
|
|
|
#include <stdio.h>
|
|
|
#include <err.h>
|
|
|
#include <errno.h>
|
|
|
#include <limits.h>
|
|
|
#include <fcntl.h>
|
|
|
#include <paths.h>
|
|
|
#include <string.h>
|
|
|
#include <unistd.h>
|
|
|
|
|
|
#include "util.h"
|
|
|
|
|
|
/*
|
|
|
* Try to get a disklabel for the specified device, and return mount_xxx
|
|
|
* style filesystem type name for the specified partition.
|
|
|
*/
|
|
|
char *
|
|
|
readlabelfs(char *device, int verbose)
|
|
|
{
|
|
|
char rpath[PATH_MAX];
|
|
|
struct dk_diskmap dm;
|
|
|
struct disklabel dk;
|
|
|
char part, *type;
|
|
|
struct stat sbuf;
|
|
|
int fd = -1;
|
|
|
|
|
|
/* Perform disk mapping if device is given as a DUID. */
|
|
|
if (isduid(device, 0)) {
|
|
|
if ((fd = open("/dev/diskmap", O_RDONLY)) != -1) {
|
|
|
bzero(&dm, sizeof(struct dk_diskmap));
|
|
|
strlcpy(rpath, device, sizeof(rpath));
|
|
|
part = rpath[strlen(rpath) - 1];
|
|
|
dm.device = rpath;
|
|
|
dm.fd = fd;
|
|
|
dm.flags = DM_OPENPART;
|
|
|
if (ioctl(fd, DIOCMAP, &dm) == -1)
|
|
|
close(fd);
|
|
|
else
|
|
|
goto disklabel;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/* Assuming device is of the form /dev/??p, build a raw partition. */
|
|
|
if (stat(device, &sbuf) < 0) {
|
|
|
if (verbose)
|
|
|
warn("%s", device);
|
|
|
return (NULL);
|
|
|
}
|
|
|
switch (sbuf.st_mode & S_IFMT) {
|
|
|
case S_IFCHR:
|
|
|
/* Ok... already a raw device. Hmm. */
|
|
|
strlcpy(rpath, device, sizeof(rpath));
|
|
|
|
|
|
/* Change partition name. */
|
|
|
part = rpath[strlen(rpath) - 1];
|
|
|
rpath[strlen(rpath) - 1] = 'a' + getrawpartition();
|
|
|
break;
|
|
|
case S_IFBLK:
|
|
|
if (strlen(device) > sizeof(_PATH_DEV) - 1) {
|
|
|
snprintf(rpath, sizeof(rpath), "%sr%s", _PATH_DEV,
|
|
|
&device[sizeof(_PATH_DEV) - 1]);
|
|
|
/* Change partition name. */
|
|
|
part = rpath[strlen(rpath) - 1];
|
|
|
rpath[strlen(rpath) - 1] = 'a' + getrawpartition();
|
|
|
break;
|
|
|
}
|
|
|
/* FALLTHROUGH */
|
|
|
default:
|
|
|
if (verbose)
|
|
|
warnx("%s: not a device node", device);
|
|
|
return (NULL);
|
|
|
}
|
|
|
|
|
|
/* If rpath doesn't exist, change that partition back. */
|
|
|
fd = open(rpath, O_RDONLY);
|
|
|
if (fd < 0) {
|
|
|
if (errno == ENOENT) {
|
|
|
rpath[strlen(rpath) - 1] = part;
|
|
|
|
|
|
fd = open(rpath, O_RDONLY);
|
|
|
if (fd < 0) {
|
|
|
if (verbose)
|
|
|
warn("%s", rpath);
|
|
|
return (NULL);
|
|
|
}
|
|
|
} else {
|
|
|
if (verbose)
|
|
|
warn("%s", rpath);
|
|
|
return (NULL);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
disklabel:
|
|
|
|
|
|
if (ioctl(fd, DIOCGDINFO, &dk) < 0) {
|
|
|
if (verbose)
|
|
|
warn("%s: couldn't read disklabel", rpath);
|
|
|
close(fd);
|
|
|
return (NULL);
|
|
|
}
|
|
|
close(fd);
|
|
|
|
|
|
if (dk.d_partitions[part - 'a'].p_fstype >= FSMAXTYPES) {
|
|
|
if (verbose)
|
|
|
warnx("%s: bad filesystem type in label", rpath);
|
|
|
return (NULL);
|
|
|
}
|
|
|
|
|
|
type = fstypesnames[dk.d_partitions[part - 'a'].p_fstype];
|
|
|
return ((type[0] == '\0') ? NULL : type);
|
|
|
}
|