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/* $OpenBSD: readlabel.c,v 1.15 2019/06/28 13:32:43 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|O_CLOEXEC)) != -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) == -1) {
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|O_CLOEXEC);
if (fd == -1) {
if (errno == ENOENT) {
rpath[strlen(rpath) - 1] = part;
fd = open(rpath, O_RDONLY|O_CLOEXEC);
if (fd == -1) {
if (verbose)
warn("%s", rpath);
return (NULL);
}
} else {
if (verbose)
warn("%s", rpath);
return (NULL);
}
}
disklabel:
if (ioctl(fd, DIOCGDINFO, &dk) == -1) {
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);
}
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