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