1 /* $NetBSD: mbrlabel.c,v 1.28 2012/07/14 20:14:17 wiz Exp $ */ 2 3 /* 4 * Copyright (C) 1998 Wolfgang Solfrank. 5 * Copyright (C) 1998 TooLs GmbH. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by TooLs GmbH. 19 * 4. The name of TooLs GmbH may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 28 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 #ifndef lint 36 __RCSID("$NetBSD: mbrlabel.c,v 1.28 2012/07/14 20:14:17 wiz Exp $"); 37 #endif /* not lint */ 38 39 #include <stdio.h> 40 #include <err.h> 41 #include <errno.h> 42 #include <fcntl.h> 43 #include <limits.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <unistd.h> 47 #include <util.h> 48 49 #include <sys/param.h> 50 #define FSTYPENAMES 51 #include <sys/disklabel.h> 52 #include <sys/bootblock.h> 53 #include <sys/ioctl.h> 54 55 #include "dkcksum.h" 56 #include "extern.h" 57 58 __dead static void usage(void); 59 static void getlabel(int); 60 static void setlabel(int, int); 61 static int getparts(int, u_int32_t, u_int32_t, int); 62 static u_int16_t getshort(void *); 63 static u_int32_t getlong(void *); 64 65 struct disklabel label; 66 67 static void 68 getlabel(int sd) 69 { 70 71 if (ioctl(sd, DIOCGDINFO, &label) < 0) { 72 perror("get label"); 73 exit(1); 74 } 75 /* 76 * Some ports seem to not set the number of partitions 77 * correctly, albeit they seem to set the raw partition ok! 78 */ 79 if (label.d_npartitions <= getrawpartition()) 80 label.d_npartitions = getrawpartition() + 1; 81 } 82 83 static void 84 setlabel(int sd, int doraw) 85 { 86 int one = 1; 87 88 label.d_checksum = 0; 89 label.d_checksum = dkcksum(&label); 90 if (ioctl(sd, doraw ? DIOCWDINFO : DIOCSDINFO, &label) < 0) { 91 perror("set label"); 92 exit(1); 93 } 94 if (!doraw) 95 /* If we haven't written to the disk, don't discard on close */ 96 ioctl(sd, DIOCKLABEL, &one); 97 98 } 99 100 static u_int16_t 101 getshort(void *p) 102 { 103 unsigned char *cp = p; 104 105 return (cp[0] | (cp[1] << 8)); 106 } 107 108 static u_int32_t 109 getlong(void *p) 110 { 111 unsigned char *cp = p; 112 113 return (cp[0] | (cp[1] << 8) | (cp[2] << 16) | (cp[3] << 24)); 114 } 115 116 static int 117 getparts(int sd, u_int32_t off, u_int32_t extoff, int verbose) 118 { 119 unsigned char buf[DEV_BSIZE]; 120 struct mbr_partition parts[MBR_PART_COUNT]; 121 struct partition npe; 122 off_t loff; 123 int i, j, unused, changed; 124 125 changed = 0; 126 loff = (off_t)off * DEV_BSIZE; 127 128 if (lseek(sd, loff, SEEK_SET) != loff) { 129 perror("seek label"); 130 exit(1); 131 } 132 if (read(sd, buf, sizeof buf) != DEV_BSIZE) { 133 if (off != MBR_BBSECTOR) 134 perror("read label (sector is possibly out of " 135 "range)"); 136 else 137 perror("read label"); 138 exit(1); 139 } 140 if (getshort(buf + MBR_MAGIC_OFFSET) != MBR_MAGIC) 141 return (changed); 142 memcpy(parts, buf + MBR_PART_OFFSET, sizeof parts); 143 144 /* scan partition table */ 145 for (i = 0; i < MBR_PART_COUNT; i++) { 146 if (parts[i].mbrp_type == 0 || 147 /* extended partitions are handled below */ 148 MBR_IS_EXTENDED(parts[i].mbrp_type)) 149 continue; 150 151 memset((void *)&npe, 0, sizeof(npe)); 152 npe.p_size = getlong(&parts[i].mbrp_size); 153 npe.p_offset = getlong(&parts[i].mbrp_start) + off; 154 npe.p_fstype = xlat_mbr_fstype(parts[i].mbrp_type); 155 156 /* find existing entry, or first free slot */ 157 unused = -1; /* flag as no free slot */ 158 if (verbose) 159 printf( 160 "Found %s partition; size %u (%u MB), offset %u\n", 161 fstypenames[npe.p_fstype], 162 npe.p_size, npe.p_size / 2048, npe.p_offset); 163 for (j = 0; j < label.d_npartitions; j++) { 164 struct partition *lpe; 165 166 if (j == RAW_PART) 167 continue; 168 lpe = &label.d_partitions[j]; 169 if (lpe->p_size == npe.p_size && 170 lpe->p_offset == npe.p_offset 171 #ifdef notyet 172 && (lpe->p_fstype == npe.p_fstype || 173 lpe->p_fstype == FS_UNUSED) */ 174 #endif 175 ) { 176 if (verbose) 177 printf( 178 " skipping existing %s partition at slot %c.\n", 179 fstypenames[lpe->p_fstype], 180 j + 'a'); 181 unused = -2; /* flag as existing */ 182 break; 183 } 184 if (unused == -1 && lpe->p_size == 0 && 185 lpe->p_fstype == FS_UNUSED) 186 unused = j; 187 } 188 if (unused == -2) 189 continue; /* entry exists, skip... */ 190 if (unused == -1) { 191 if (label.d_npartitions < MAXPARTITIONS) { 192 unused = label.d_npartitions; 193 label.d_npartitions++; 194 } else { 195 printf( 196 " WARNING: no slots free for %s partition.\n", 197 fstypenames[npe.p_fstype]); 198 continue; 199 } 200 } 201 202 if (verbose) 203 printf(" adding %s partition to slot %c.\n", 204 fstypenames[npe.p_fstype], unused + 'a'); 205 switch (npe.p_fstype) { 206 case FS_BSDFFS: 207 case FS_APPLEUFS: 208 npe.p_size = 16384; /* XXX */ 209 npe.p_fsize = 1024; 210 npe.p_frag = 8; 211 npe.p_cpg = 16; 212 break; 213 #ifdef __does_not_happen__ 214 case FS_BSDLFS: 215 npe.p_size = 16384; /* XXX */ 216 npe.p_fsize = 1024; 217 npe.p_frag = 8; 218 npe.p_sgs = XXX; 219 break; 220 #endif 221 } 222 changed++; 223 label.d_partitions[unused] = npe; 224 } 225 226 /* recursively scan extended partitions */ 227 for (i = 0; i < MBR_PART_COUNT; i++) { 228 u_int32_t poff; 229 230 if (MBR_IS_EXTENDED(parts[i].mbrp_type)) { 231 poff = getlong(&parts[i].mbrp_start) + extoff; 232 changed += getparts(sd, poff, 233 extoff ? extoff : poff, verbose); 234 } 235 } 236 return (changed); 237 } 238 239 static void 240 usage(void) 241 { 242 fprintf(stderr, "usage: %s [-fqrw] [-s sector] device\n", 243 getprogname()); 244 exit(1); 245 } 246 247 248 int 249 main(int argc, char **argv) 250 { 251 int sd, ch, changed; 252 char *ep, name[MAXPATHLEN]; 253 int force; /* force label update */ 254 int raw; /* update on-disk label as well */ 255 int verbose; /* verbose output */ 256 int write_it; /* update in-core label if changed */ 257 uint32_t sector; /* sector that contains the MBR */ 258 ulong ulsector; 259 260 force = 0; 261 raw = 0; 262 verbose = 1; 263 write_it = 0; 264 sector = MBR_BBSECTOR; 265 while ((ch = getopt(argc, argv, "fqrs:w")) != -1) { 266 switch (ch) { 267 case 'f': 268 force = 1; 269 break; 270 case 'q': 271 verbose = 0; 272 break; 273 case 'r': 274 raw = 1; 275 break; 276 case 's': 277 errno = 0; 278 ulsector = strtoul(optarg, &ep, 10); 279 if (optarg[0] == '\0' || *ep != '\0') 280 errx(EXIT_FAILURE, 281 "sector number (%s) incorrectly specified", 282 optarg); 283 if ((errno == ERANGE && ulsector == ULONG_MAX) || 284 ulsector > UINT32_MAX) 285 errx(EXIT_FAILURE, 286 "sector number (%s) out of range", 287 optarg); 288 sector = (uint32_t)ulsector; 289 break; 290 case 'w': 291 write_it = 1; 292 break; 293 default: 294 usage(); 295 } 296 } 297 argc -= optind; 298 argv += optind; 299 if (argc != 1) 300 usage(); 301 302 if ((sd = opendisk(argv[0], write_it ? O_RDWR : O_RDONLY, name, 303 (size_t)MAXPATHLEN, 0)) < 0) { 304 perror(argv[0]); 305 exit(1); 306 } 307 getlabel(sd); 308 changed = getparts(sd, sector, 0, verbose); 309 310 if (verbose) { 311 putchar('\n'); 312 showpartitions(stdout, &label, 0); 313 putchar('\n'); 314 } 315 if (write_it) { 316 if (! changed && ! force) 317 printf("No change; not updating disk label.\n"); 318 else { 319 if (verbose) 320 printf("Updating in-core %sdisk label.\n", 321 raw ? "and on-disk " : ""); 322 setlabel(sd, raw); 323 } 324 } else { 325 printf("Not updating disk label.\n"); 326 } 327 close(sd); 328 return (0); 329 } 330