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/* $OpenBSD: opendev.c,v 1.17 2022/08/26 21:47:16 kn Exp $ */
/*
* Copyright (c) 2000, Todd C. Miller. All rights reserved.
* 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 <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <paths.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/limits.h>
#include <sys/disk.h>
#include <sys/dkio.h>
#include "util.h"
/*
* This routine is a generic rewrite of the original code found in
* disklabel(8).
*/
int
opendev(const char *path, int oflags, int dflags, char **realpath)
{
static char namebuf[PATH_MAX];
struct dk_diskmap dm;
char *slash, *prefix;
int fd;
/* Initial state */
fd = -1;
errno = ENOENT;
if (dflags & OPENDEV_BLCK)
prefix = ""; /* block device */
else
prefix = "r"; /* character device */
if ((slash = strchr(path, '/'))) {
strlcpy(namebuf, path, sizeof(namebuf));
fd = open(namebuf, oflags);
} else if (isduid(path, dflags)) {
strlcpy(namebuf, path, sizeof(namebuf));
if ((fd = open("/dev/diskmap", oflags)) != -1) {
bzero(&dm, sizeof(struct dk_diskmap));
dm.device = namebuf;
dm.fd = fd;
if (dflags & OPENDEV_PART)
dm.flags |= DM_OPENPART;
if (dflags & OPENDEV_BLCK)
dm.flags |= DM_OPENBLCK;
if (ioctl(fd, DIOCMAP, &dm) == -1) {
close(fd);
fd = -1;
errno = ENOENT;
}
}
}
if (!slash && fd == -1 && errno == ENOENT) {
if (dflags & OPENDEV_PART) {
/*
* First try raw partition (for removable drives)
*/
if (snprintf(namebuf, sizeof(namebuf), "%s%s%s%c",
_PATH_DEV, prefix, path, 'a' + getrawpartition())
< sizeof(namebuf)) {
fd = open(namebuf, oflags);
} else
errno = ENAMETOOLONG;
}
if (fd == -1 && errno == ENOENT) {
if (snprintf(namebuf, sizeof(namebuf), "%s%s%s",
_PATH_DEV, prefix, path) < sizeof(namebuf)) {
fd = open(namebuf, oflags);
} else
errno = ENAMETOOLONG;
}
}
if (realpath)
*realpath = namebuf;
return (fd);
}
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