1 /* 2 * Copyright (c) 1983, 1987, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char rcsid[] = "$OpenBSD: disklabel.c,v 1.9 2003/06/11 21:03:10 deraadt Exp $"; 32 #endif /* LIBC_SCCS and not lint */ 33 34 #include <sys/param.h> 35 #define DKTYPENAMES 36 #include <sys/disklabel.h> 37 #include <ufs/ffs/fs.h> 38 39 #include <ctype.h> 40 #include <errno.h> 41 #include <fcntl.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 47 static int gettype(char *, char **); 48 49 struct disklabel * 50 getdiskbyname(const char *name) 51 { 52 static struct disklabel disk; 53 register struct disklabel *dp = &disk; 54 register struct partition *pp; 55 char *buf; 56 char *db_array[2] = { _PATH_DISKTAB, 0 }; 57 char *cp, *cq; /* can't be register */ 58 char p, max, psize[3], pbsize[3], 59 pfsize[3], poffset[3], ptype[3]; 60 u_int32_t *dx; 61 62 if (cgetent(&buf, db_array, (char *) name) < 0) 63 return NULL; 64 65 bzero((char *)&disk, sizeof(disk)); 66 /* 67 * typename 68 */ 69 cq = dp->d_typename; 70 cp = buf; 71 while (cq < dp->d_typename + sizeof(dp->d_typename) - 1 && 72 (*cq = *cp) && *cq != '|' && *cq != ':') 73 cq++, cp++; 74 *cq = '\0'; 75 /* 76 * boot name (optional) xxboot, bootxx 77 */ 78 cgetstr(buf, "b0", &dp->d_boot0); 79 cgetstr(buf, "b1", &dp->d_boot1); 80 81 if (cgetstr(buf, "ty", &cq) > 0 && strcmp(cq, "removable") == 0) 82 dp->d_flags |= D_REMOVABLE; 83 else if (cq && strcmp(cq, "simulated") == 0) 84 dp->d_flags |= D_RAMDISK; 85 if (cgetcap(buf, "sf", ':') != NULL) 86 dp->d_flags |= D_BADSECT; 87 88 #define getnumdflt(field, dname, dflt) \ 89 { long f; (field) = (cgetnum(buf, dname, &f) == -1) ? (dflt) : f; } 90 #define getnum(field, dname) \ 91 { long f; cgetnum(buf, dname, &f); field = f; } 92 93 getnumdflt(dp->d_secsize, "se", DEV_BSIZE); 94 getnum(dp->d_ntracks, "nt"); 95 getnum(dp->d_nsectors, "ns"); 96 getnum(dp->d_ncylinders, "nc"); 97 98 if (cgetstr(buf, "dt", &cq) > 0) 99 dp->d_type = gettype(cq, dktypenames); 100 else 101 getnumdflt(dp->d_type, "dt", 0); 102 getnumdflt(dp->d_secpercyl, "sc", dp->d_nsectors * dp->d_ntracks); 103 getnumdflt(dp->d_secperunit, "su", dp->d_secpercyl * dp->d_ncylinders); 104 getnumdflt(dp->d_rpm, "rm", 3600); 105 getnumdflt(dp->d_interleave, "il", 1); 106 getnumdflt(dp->d_trackskew, "sk", 0); 107 getnumdflt(dp->d_cylskew, "cs", 0); 108 getnumdflt(dp->d_headswitch, "hs", 0); 109 getnumdflt(dp->d_trkseek, "ts", 0); 110 getnumdflt(dp->d_bbsize, "bs", BBSIZE); 111 getnumdflt(dp->d_sbsize, "sb", SBSIZE); 112 strlcpy(psize, "px", sizeof psize); 113 strlcpy(pbsize, "bx", sizeof pbsize); 114 strlcpy(pfsize, "fx", sizeof pfsize); 115 strlcpy(poffset, "ox", sizeof poffset); 116 strlcpy(ptype, "tx", sizeof ptype); 117 max = 'a' - 1; 118 pp = &dp->d_partitions[0]; 119 for (p = 'a'; p < 'a' + MAXPARTITIONS; p++, pp++) { 120 long f; 121 122 psize[1] = pbsize[1] = pfsize[1] = poffset[1] = ptype[1] = p; 123 if (cgetnum(buf, psize, &f) == -1) 124 pp->p_size = 0; 125 else { 126 pp->p_size = f; 127 getnum(pp->p_offset, poffset); 128 getnumdflt(pp->p_fsize, pfsize, 0); 129 if (pp->p_fsize) { 130 long bsize; 131 132 if (cgetnum(buf, pbsize, &bsize) == 0) 133 pp->p_frag = bsize / pp->p_fsize; 134 else 135 pp->p_frag = 8; 136 } 137 getnumdflt(pp->p_fstype, ptype, 0); 138 if (pp->p_fstype == 0 && cgetstr(buf, ptype, &cq) > 0) 139 pp->p_fstype = gettype(cq, fstypenames); 140 max = p; 141 } 142 } 143 dp->d_npartitions = max + 1 - 'a'; 144 (void)strlcpy(psize, "dx", sizeof psize); 145 dx = dp->d_drivedata; 146 for (p = '0'; p < '0' + NDDATA; p++, dx++) { 147 psize[1] = p; 148 getnumdflt(*dx, psize, 0); 149 } 150 dp->d_magic = DISKMAGIC; 151 dp->d_magic2 = DISKMAGIC; 152 free(buf); 153 return (dp); 154 } 155 156 static int 157 gettype(char *t, char **names) 158 { 159 register char **nm; 160 161 for (nm = names; *nm; nm++) 162 if (strcasecmp(t, *nm) == 0) 163 return (nm - names); 164 if (isdigit((u_char)*t)) 165 return (atoi(t)); 166 return (0); 167 } 168