GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libutil/opendev.c Lines: 0 37 0.0 %
Date: 2017-11-13 Branches: 0 30 0.0 %

Line Branch Exec Source
1
/*	$OpenBSD: opendev.c,v 1.15 2011/06/30 15:04:58 jsing Exp $	*/
2
3
/*
4
 * Copyright (c) 2000, Todd C. Miller.  All rights reserved.
5
 * Copyright (c) 1996, Jason Downs.  All rights reserved.
6
 *
7
 * Redistribution and use in source and binary forms, with or without
8
 * modification, are permitted provided that the following conditions
9
 * are met:
10
 * 1. Redistributions of source code must retain the above copyright
11
 *    notice, this list of conditions and the following disclaimer.
12
 * 2. Redistributions in binary form must reproduce the above copyright
13
 *    notice, this list of conditions and the following disclaimer in the
14
 *    documentation and/or other materials provided with the distribution.
15
 *
16
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS
17
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19
 * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
20
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
23
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26
 * SUCH DAMAGE.
27
 */
28
29
#include <errno.h>
30
#include <fcntl.h>
31
#include <limits.h>
32
#include <paths.h>
33
#include <stdio.h>
34
#include <string.h>
35
#include <unistd.h>
36
37
#include <sys/ioctl.h>
38
#include <sys/limits.h>
39
#include <sys/disk.h>
40
#include <sys/dkio.h>
41
42
#include "util.h"
43
44
/*
45
 * This routine is a generic rewrite of the original code found in
46
 * disklabel(8).
47
 */
48
int
49
opendev(const char *path, int oflags, int dflags, char **realpath)
50
{
51
	static char namebuf[PATH_MAX];
52
	struct dk_diskmap dm;
53
	char *slash, *prefix;
54
	int fd;
55
56
	/* Initial state */
57
	fd = -1;
58
	errno = ENOENT;
59
60
	if (dflags & OPENDEV_BLCK)
61
		prefix = "";			/* block device */
62
	else
63
		prefix = "r";			/* character device */
64
65
	if ((slash = strchr(path, '/'))) {
66
		strlcpy(namebuf, path, sizeof(namebuf));
67
		fd = open(namebuf, oflags);
68
	} else if (isduid(path, dflags)) {
69
		strlcpy(namebuf, path, sizeof(namebuf));
70
		if ((fd = open("/dev/diskmap", oflags)) != -1) {
71
			bzero(&dm, sizeof(struct dk_diskmap));
72
			dm.device = namebuf;
73
			dm.fd = fd;
74
			if (dflags & OPENDEV_PART)
75
				dm.flags |= DM_OPENPART;
76
			if (dflags & OPENDEV_BLCK)
77
				dm.flags |= DM_OPENBLCK;
78
79
			if (ioctl(fd, DIOCMAP, &dm) == -1) {
80
				close(fd);
81
				fd = -1;
82
				errno = ENOENT;
83
			}
84
		}
85
	}
86
	if (!slash && fd == -1 && errno == ENOENT) {
87
		if (dflags & OPENDEV_PART) {
88
			/*
89
			 * First try raw partition (for removable drives)
90
			 */
91
			if (snprintf(namebuf, sizeof(namebuf), "%s%s%s%c",
92
			    _PATH_DEV, prefix, path, 'a' + getrawpartition())
93
			    < sizeof(namebuf)) {
94
				fd = open(namebuf, oflags);
95
			} else
96
				errno = ENAMETOOLONG;
97
		}
98
		if (fd == -1 && errno == ENOENT) {
99
			if (snprintf(namebuf, sizeof(namebuf), "%s%s%s",
100
			    _PATH_DEV, prefix, path) < sizeof(namebuf)) {
101
				fd = open(namebuf, oflags);
102
			} else
103
				errno = ENAMETOOLONG;
104
		}
105
	}
106
	if (realpath)
107
		*realpath = namebuf;
108
109
	return (fd);
110
}