|
|
- /* $OpenBSD: readlabel.c,v 1.7 2002/02/21 16:22:23 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 <stdio.h>
- #include <err.h>
- #include <errno.h>
- #include <fcntl.h>
- #include <paths.h>
- #include <string.h>
- #include <unistd.h>
- #include <sys/dkio.h>
- #define DKTYPENAMES
- #include <sys/disklabel.h>
- #include <sys/ioctl.h>
- #include <sys/param.h>
- #include <sys/stat.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(device, verbose)
- char *device;
- int verbose;
- {
- char rpath[MAXPATHLEN];
- char part, *type;
- struct stat sbuf;
- struct disklabel dk;
- int fd;
-
- /* 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. */
- strncpy(rpath, device, sizeof(rpath));
- rpath[sizeof(rpath) - 1] = '\0';
-
- /* 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;
- }
- 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);
- }
- }
- 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);
- }
|