1 /* $NetBSD: getfsspecname.c,v 1.5 2014/05/25 13:46:07 christos 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 1.5 2014/05/25 13:46:07 christos 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 #if !defined(__minix) 50 #define COMPAT_DKWEDGE /* To be removed */ 51 #endif /* !defined(__minix) */ 52 53 const char * 54 getfsspecname(char *buf, size_t bufsiz, const char *name) 55 { 56 static const int mib[] = { CTL_HW, HW_DISKNAMES }; 57 static const unsigned int miblen = __arraycount(mib); 58 char *drives, *dk, *p; 59 size_t len; 60 int fd, savee = errno; 61 char *vname; 62 63 p = drives = vname = NULL; 64 if (strncasecmp(name, "NAME=", 5) != 0) { 65 #ifdef COMPAT_DKWEDGE 66 /* 67 * We try to open the disk name, and if we fail with EBUSY 68 * we use the name as the label to find the wedge. 69 */ 70 char rbuf[MAXPATHLEN]; 71 if (name[0] == '/') { 72 if (getdiskrawname(rbuf, sizeof(rbuf), name) != NULL) { 73 if ((fd = open(rbuf, O_RDONLY)) == -1) { 74 if (errno == EBUSY) { 75 name = strrchr(name, '/') + 1; 76 goto search; 77 } 78 } else 79 close(fd); 80 } 81 } 82 #endif 83 strlcpy(buf, name, bufsiz); 84 return buf; 85 } else 86 name += 5; 87 88 #ifdef COMPAT_DKWEDGE 89 search: 90 #endif 91 vname = malloc(strlen(name) * 4 + 1); 92 if (vname == NULL) { 93 savee = errno; 94 strlcpy(buf, "malloc failed", bufsiz); 95 goto out; 96 } 97 98 strunvis(vname, name); 99 100 if (sysctl(mib, miblen, NULL, &len, NULL, 0) == -1) { 101 savee = errno; 102 strlcpy(buf, "sysctl hw.disknames failed", bufsiz); 103 goto out; 104 } 105 106 drives = malloc(len); 107 if (drives == NULL) { 108 savee = errno; 109 strlcpy(buf, "malloc failed", bufsiz); 110 goto out; 111 } 112 if (sysctl(mib, miblen, drives, &len, NULL, 0) == -1) { 113 savee = errno; 114 strlcpy(buf, "sysctl hw.disknames failed", bufsiz); 115 goto out; 116 } 117 118 for (dk = strtok(drives, " "); dk != NULL; dk = strtok(NULL, " ")) { 119 struct dkwedge_info dkw; 120 if (strncmp(dk, "dk", 2) != 0) 121 continue; 122 fd = opendisk(dk, O_RDONLY, buf, bufsiz, 0); 123 if (fd == -1) 124 continue; 125 if (ioctl(fd, DIOCGWEDGEINFO, &dkw) == -1) { 126 savee = errno; 127 snprintf(buf, bufsiz, "%s: getwedgeinfo", dk); 128 (void)close(fd); 129 goto out; 130 } 131 (void)close(fd); 132 if (strcmp(vname, (char *)dkw.dkw_wname) == 0) { 133 p = strstr(buf, "/rdk"); 134 goto good; 135 } 136 } 137 #ifdef COMPAT_DKWEDGE 138 /* Last ditch effort assuming NAME=label, and label is a disk name */ 139 fd = opendisk(name, O_RDONLY, buf, bufsiz, 0); 140 if (fd != -1) { 141 close(fd); 142 p = strstr(buf, "/r"); 143 goto good; 144 } 145 #endif 146 savee = ESRCH; 147 snprintf(buf, bufsiz, "no match for `%s'", vname); 148 out: 149 buf = NULL; 150 good: 151 if (p++ != NULL) 152 strcpy(p, p + 1); 153 free(drives); 154 free(vname); 155 errno = savee; 156 return buf; 157 } 158