145 lines
4.0 KiB
C
145 lines
4.0 KiB
C
/* $OpenBSD: readlabel.c,v 1.15 2019/06/28 13:32:43 deraadt Exp $ */
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/*
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* Copyright (c) 1996, Jason Downs. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/disk.h>
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#include <sys/dkio.h>
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#define DKTYPENAMES
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#include <sys/disklabel.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <err.h>
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#include <errno.h>
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#include <limits.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <string.h>
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#include <unistd.h>
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#include "util.h"
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/*
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* Try to get a disklabel for the specified device, and return mount_xxx
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* style filesystem type name for the specified partition.
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*/
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char *
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readlabelfs(char *device, int verbose)
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{
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char rpath[PATH_MAX];
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struct dk_diskmap dm;
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struct disklabel dk;
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char part, *type;
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struct stat sbuf;
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int fd = -1;
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/* Perform disk mapping if device is given as a DUID. */
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if (isduid(device, 0)) {
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if ((fd = open("/dev/diskmap", O_RDONLY|O_CLOEXEC)) != -1) {
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bzero(&dm, sizeof(struct dk_diskmap));
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strlcpy(rpath, device, sizeof(rpath));
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part = rpath[strlen(rpath) - 1];
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dm.device = rpath;
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dm.fd = fd;
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dm.flags = DM_OPENPART;
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if (ioctl(fd, DIOCMAP, &dm) == -1)
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close(fd);
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else
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goto disklabel;
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}
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}
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/* Assuming device is of the form /dev/??p, build a raw partition. */
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if (stat(device, &sbuf) == -1) {
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if (verbose)
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warn("%s", device);
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return (NULL);
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}
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switch (sbuf.st_mode & S_IFMT) {
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case S_IFCHR:
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/* Ok... already a raw device. Hmm. */
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strlcpy(rpath, device, sizeof(rpath));
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/* Change partition name. */
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part = rpath[strlen(rpath) - 1];
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rpath[strlen(rpath) - 1] = 'a' + getrawpartition();
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break;
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case S_IFBLK:
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if (strlen(device) > sizeof(_PATH_DEV) - 1) {
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snprintf(rpath, sizeof(rpath), "%sr%s", _PATH_DEV,
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&device[sizeof(_PATH_DEV) - 1]);
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/* Change partition name. */
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part = rpath[strlen(rpath) - 1];
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rpath[strlen(rpath) - 1] = 'a' + getrawpartition();
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break;
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}
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/* FALLTHROUGH */
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default:
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if (verbose)
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warnx("%s: not a device node", device);
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return (NULL);
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}
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/* If rpath doesn't exist, change that partition back. */
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fd = open(rpath, O_RDONLY|O_CLOEXEC);
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if (fd == -1) {
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if (errno == ENOENT) {
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rpath[strlen(rpath) - 1] = part;
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fd = open(rpath, O_RDONLY|O_CLOEXEC);
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if (fd == -1) {
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if (verbose)
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warn("%s", rpath);
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return (NULL);
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}
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} else {
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if (verbose)
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warn("%s", rpath);
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return (NULL);
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}
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}
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disklabel:
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if (ioctl(fd, DIOCGDINFO, &dk) == -1) {
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if (verbose)
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warn("%s: couldn't read disklabel", rpath);
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close(fd);
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return (NULL);
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}
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close(fd);
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if (dk.d_partitions[part - 'a'].p_fstype >= FSMAXTYPES) {
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if (verbose)
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warnx("%s: bad filesystem type in label", rpath);
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return (NULL);
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}
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type = fstypesnames[dk.d_partitions[part - 'a'].p_fstype];
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return ((type[0] == '\0') ? NULL : type);
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}
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