1 /* $NetBSD: getfsspecname.c,v 1.3 2012/04/08 20:56:12 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 1.3 2012/04/08 20:56:12 christos Exp $"); 33 34 #include <sys/types.h> 35 #include <sys/sysctl.h> 36 #include <sys/disk.h> 37 38 #include <stdio.h> 39 #include <vis.h> 40 #include <string.h> 41 #include <fstab.h> 42 #include <fcntl.h> 43 #include <stdlib.h> 44 #include <errno.h> 45 #include <unistd.h> 46 #include <util.h> 47 48 #define COMPAT_DKWEDGE /* To be removed */ 49 50 const char * 51 getfsspecname(char *buf, size_t bufsiz, const char *name) 52 { 53 static const int mib[] = { CTL_HW, HW_DISKNAMES }; 54 static const unsigned int miblen = __arraycount(mib); 55 char *drives, *dk; 56 size_t len; 57 int fd, savee; 58 char *vname; 59 60 drives = NULL; 61 vname = NULL; 62 if (strncasecmp(name, "NAME=", 5) != 0) { 63 #ifdef COMPAT_DKWEDGE 64 /* 65 * We try to open the disk name, and if we fail with EBUSY 66 * we use the name as the label to find the wedge. 67 */ 68 char rbuf[MAXPATHLEN]; 69 if (name[0] == '/') { 70 if (getdiskrawname(rbuf, sizeof(rbuf), name) != NULL) { 71 if ((fd = open(rbuf, O_RDONLY)) == -1) { 72 if (errno == EBUSY) { 73 name = strrchr(name, '/') + 1; 74 goto search; 75 } 76 } else 77 close(fd); 78 } 79 } 80 #endif 81 strlcpy(buf, name, bufsiz); 82 return buf; 83 } else 84 name += 5; 85 86 #ifdef COMPAT_DKWEDGE 87 search: 88 #endif 89 vname = malloc(strlen(name) * 4 + 1); 90 if (vname == NULL) { 91 savee = errno; 92 strlcpy(buf, "malloc failed", bufsiz); 93 goto out; 94 } 95 96 strunvis(vname, name); 97 98 if (sysctl(mib, miblen, NULL, &len, NULL, 0) == -1) { 99 savee = errno; 100 strlcpy(buf, "sysctl hw.disknames failed", bufsiz); 101 goto out; 102 } 103 104 drives = malloc(len); 105 if (drives == NULL) { 106 savee = errno; 107 strlcpy(buf, "malloc failed", bufsiz); 108 goto out; 109 } 110 if (sysctl(mib, miblen, drives, &len, NULL, 0) == -1) { 111 savee = errno; 112 strlcpy(buf, "sysctl hw.disknames failed", bufsiz); 113 goto out; 114 } 115 116 for (dk = strtok(drives, " "); dk != NULL; dk = strtok(NULL, " ")) { 117 struct dkwedge_info dkw; 118 if (strncmp(dk, "dk", 2) != 0) 119 continue; 120 fd = opendisk(dk, O_RDONLY, buf, bufsiz, 0); 121 if (fd == -1) 122 continue; 123 if (ioctl(fd, DIOCGWEDGEINFO, &dkw) == -1) { 124 savee = errno; 125 snprintf(buf, bufsiz, "%s: getwedgeinfo", dk); 126 (void)close(fd); 127 goto out; 128 } 129 (void)close(fd); 130 if (strcmp(vname, (char *)dkw.dkw_wname) == 0) { 131 char *p = strstr(buf, "/rdk"); 132 if (p++ == NULL) 133 return buf; 134 strcpy(p, p + 1); 135 free(drives); 136 free(vname); 137 return buf; 138 } 139 } 140 savee = ESRCH; 141 snprintf(buf, bufsiz, "no match for `%s'", vname); 142 out: 143 free(drives); 144 free(vname); 145 errno = savee; 146 return NULL; 147 } 148