getfsspecname.c revision 1.4 1 /* $NetBSD: getfsspecname.c,v 1.4 2013/01/01 18:32:17 dsl Exp $ */
2
3 /*-
4 * Copyright (c) 2012 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31 #include <sys/cdefs.h>
32 __RCSID("$NetBSD: getfsspecname.c,v 1.4 2013/01/01 18:32:17 dsl Exp $");
33
34 #include <sys/types.h>
35 #include <sys/ioctl.h>
36 #include <sys/sysctl.h>
37 #include <sys/disk.h>
38
39 #include <stdio.h>
40 #include <vis.h>
41 #include <string.h>
42 #include <fstab.h>
43 #include <fcntl.h>
44 #include <stdlib.h>
45 #include <errno.h>
46 #include <unistd.h>
47 #include <util.h>
48
49 #define COMPAT_DKWEDGE /* To be removed */
50
51 const char *
52 getfsspecname(char *buf, size_t bufsiz, const char *name)
53 {
54 static const int mib[] = { CTL_HW, HW_DISKNAMES };
55 static const unsigned int miblen = __arraycount(mib);
56 char *drives, *dk;
57 size_t len;
58 int fd, savee;
59 char *vname;
60
61 drives = NULL;
62 vname = NULL;
63 if (strncasecmp(name, "NAME=", 5) != 0) {
64 #ifdef COMPAT_DKWEDGE
65 /*
66 * We try to open the disk name, and if we fail with EBUSY
67 * we use the name as the label to find the wedge.
68 */
69 char rbuf[MAXPATHLEN];
70 if (name[0] == '/') {
71 if (getdiskrawname(rbuf, sizeof(rbuf), name) != NULL) {
72 if ((fd = open(rbuf, O_RDONLY)) == -1) {
73 if (errno == EBUSY) {
74 name = strrchr(name, '/') + 1;
75 goto search;
76 }
77 } else
78 close(fd);
79 }
80 }
81 #endif
82 strlcpy(buf, name, bufsiz);
83 return buf;
84 } else
85 name += 5;
86
87 #ifdef COMPAT_DKWEDGE
88 search:
89 #endif
90 vname = malloc(strlen(name) * 4 + 1);
91 if (vname == NULL) {
92 savee = errno;
93 strlcpy(buf, "malloc failed", bufsiz);
94 goto out;
95 }
96
97 strunvis(vname, name);
98
99 if (sysctl(mib, miblen, NULL, &len, NULL, 0) == -1) {
100 savee = errno;
101 strlcpy(buf, "sysctl hw.disknames failed", bufsiz);
102 goto out;
103 }
104
105 drives = malloc(len);
106 if (drives == NULL) {
107 savee = errno;
108 strlcpy(buf, "malloc failed", bufsiz);
109 goto out;
110 }
111 if (sysctl(mib, miblen, drives, &len, NULL, 0) == -1) {
112 savee = errno;
113 strlcpy(buf, "sysctl hw.disknames failed", bufsiz);
114 goto out;
115 }
116
117 for (dk = strtok(drives, " "); dk != NULL; dk = strtok(NULL, " ")) {
118 struct dkwedge_info dkw;
119 if (strncmp(dk, "dk", 2) != 0)
120 continue;
121 fd = opendisk(dk, O_RDONLY, buf, bufsiz, 0);
122 if (fd == -1)
123 continue;
124 if (ioctl(fd, DIOCGWEDGEINFO, &dkw) == -1) {
125 savee = errno;
126 snprintf(buf, bufsiz, "%s: getwedgeinfo", dk);
127 (void)close(fd);
128 goto out;
129 }
130 (void)close(fd);
131 if (strcmp(vname, (char *)dkw.dkw_wname) == 0) {
132 char *p = strstr(buf, "/rdk");
133 if (p++ == NULL)
134 return buf;
135 strcpy(p, p + 1);
136 free(drives);
137 free(vname);
138 return buf;
139 }
140 }
141 savee = ESRCH;
142 snprintf(buf, bufsiz, "no match for `%s'", vname);
143 out:
144 free(drives);
145 free(vname);
146 errno = savee;
147 return NULL;
148 }
149