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