1 /* $NetBSD: installboot.c,v 1.4 1998/09/05 15:20:48 pk Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Paul Kranenburg. 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/param.h> 40 #include <sys/mount.h> 41 #include <sys/time.h> 42 #include <sys/stat.h> 43 #include <ufs/ufs/dinode.h> 44 #include <ufs/ufs/dir.h> 45 #include <ufs/ffs/fs.h> 46 #include <err.h> 47 #include <a.out.h> 48 #include <fcntl.h> 49 #include <nlist.h> 50 #include <stdlib.h> 51 #include <stdio.h> 52 #include <string.h> 53 #include <unistd.h> 54 #include <sys/disklabel.h> 55 56 int verbose, nowrite, hflag; 57 char *boot, *proto, *dev; 58 struct nlist nl[] = { 59 #define X_BLOCK_SIZE 0 60 {"_block_size"}, 61 #define X_BLOCK_COUNT 1 62 {"_block_count"}, 63 #define X_BLOCK_TABLE 2 64 {"_block_table"}, 65 {NULL} 66 }; 67 68 int *block_size_p; /* block size var. in prototype image */ 69 int *block_count_p; /* block count var. in prototype image */ 70 daddr_t *block_table; /* block number array in prototype image */ 71 int maxblocknum; /* size of this array */ 72 73 74 char *loadprotoblocks __P((char *, long *)); 75 int loadblocknums __P((char *, int)); 76 static void devread __P((int, void *, daddr_t, size_t, char *)); 77 static void usage __P((void)); 78 int main __P((int, char *[])); 79 80 81 static void 82 usage() 83 { 84 fprintf(stderr, 85 "usage: installboot [-n] [-v] [-h] <boot> <proto> <device>\n"); 86 exit(1); 87 } 88 89 int 90 main(argc, argv) 91 int argc; 92 char *argv[]; 93 { 94 int c; 95 int devfd; 96 char *protostore; 97 long protosize; 98 99 while ((c = getopt(argc, argv, "vnh")) != -1) { 100 switch (c) { 101 case 'h': 102 /* Don't strip a.out header */ 103 hflag = 1; 104 break; 105 case 'n': 106 /* Do not actually write the bootblock to disk */ 107 nowrite = 1; 108 break; 109 case 'v': 110 /* Chat */ 111 verbose = 1; 112 break; 113 default: 114 usage(); 115 } 116 } 117 118 if (argc - optind < 3) { 119 usage(); 120 } 121 122 boot = argv[optind]; 123 proto = argv[optind + 1]; 124 dev = argv[optind + 2]; 125 126 if (verbose) { 127 printf("boot: %s\n", boot); 128 printf("proto: %s\n", proto); 129 printf("device: %s\n", dev); 130 } 131 132 /* Load proto blocks into core */ 133 if ((protostore = loadprotoblocks(proto, &protosize)) == NULL) 134 exit(1); 135 136 /* XXX - Paranoia: Make sure size is aligned! */ 137 if (protosize & (DEV_BSIZE - 1)) 138 err(1, "proto bootblock bad size=%d", protosize); 139 140 /* Open and check raw disk device */ 141 if ((devfd = open(dev, O_RDONLY, 0)) < 0) 142 err(1, "open: %s", dev); 143 144 /* Extract and load block numbers */ 145 if (loadblocknums(boot, devfd) != 0) 146 exit(1); 147 148 (void)close(devfd); 149 150 if (nowrite) 151 return 0; 152 153 /* Write patched proto bootblocks into the superblock */ 154 if (protosize > SBSIZE - DEV_BSIZE) 155 errx(1, "proto bootblocks too big"); 156 157 /* The primary bootblock needs to be written to the raw partition */ 158 dev[strlen(dev) - 1] = 'a' + RAW_PART; 159 160 if ((devfd = open(dev, O_RDWR, 0)) < 0) 161 err(1, "open: %s", dev); 162 163 if (lseek(devfd, DEV_BSIZE, SEEK_SET) != DEV_BSIZE) 164 err(1, "lseek bootstrap"); 165 166 /* Sync filesystems (to clean in-memory superblock?) */ 167 sync(); 168 169 if (write(devfd, protostore, protosize) != protosize) 170 err(1, "write bootstrap"); 171 (void)close(devfd); 172 return 0; 173 } 174 175 char * 176 loadprotoblocks(fname, size) 177 char *fname; 178 long *size; 179 { 180 int fd; 181 size_t tdsize; /* text+data size */ 182 size_t bbsize; /* boot block size (block aligned) */ 183 char *bp; 184 struct nlist *nlp; 185 struct exec eh; 186 long off; 187 188 fd = -1; 189 bp = NULL; 190 191 /* Locate block number array in proto file */ 192 if (nlist(fname, nl) != 0) { 193 warnx("nlist: %s: symbols not found", fname); 194 return NULL; 195 } 196 /* Validate symbol types (global data). */ 197 for (nlp = nl; nlp->n_un.n_name; nlp++) { 198 if (nlp->n_type != (N_DATA | N_EXT)) { 199 warnx("nlist: %s: wrong type", nlp->n_un.n_name); 200 return NULL; 201 } 202 } 203 204 if ((fd = open(fname, O_RDONLY)) < 0) { 205 warn("open: %s", fname); 206 return NULL; 207 } 208 if (read(fd, &eh, sizeof(eh)) != sizeof(eh)) { 209 warn("read: %s", fname); 210 goto bad; 211 } 212 if (N_GETMAGIC(eh) != OMAGIC) { 213 warn("bad magic: 0x%x", eh.a_midmag); 214 goto bad; 215 } 216 /* 217 * We have to include the exec header in the beginning of 218 * the buffer, and leave extra space at the end in case 219 * the actual write to disk wants to skip the header. 220 */ 221 tdsize = eh.a_text + eh.a_data; 222 bbsize = tdsize + sizeof(eh); 223 bbsize = roundup(bbsize, DEV_BSIZE); 224 225 /* 226 * Allocate extra space here because the caller may copy 227 * the boot block starting at the end of the exec header. 228 * This prevents reading beyond the end of the buffer. 229 */ 230 if ((bp = calloc(bbsize + sizeof(eh), 1)) == NULL) { 231 warnx("malloc: %s: no memory", fname); 232 goto bad; 233 } 234 /* Copy the exec header and read the rest of the file. */ 235 memcpy(bp, &eh, sizeof(eh)); 236 if (read(fd, bp+sizeof(eh), tdsize) != tdsize) { 237 warn("read: %s", fname); 238 goto bad; 239 } 240 241 *size = bbsize; /* aligned to DEV_BSIZE */ 242 243 /* Calculate the symbols' locations within the proto file */ 244 off = N_DATOFF(eh) - N_DATADDR(eh) - (eh.a_entry - N_TXTADDR(eh)); 245 block_size_p = (int *) (bp + nl[X_BLOCK_SIZE ].n_value + off); 246 block_count_p = (int *) (bp + nl[X_BLOCK_COUNT].n_value + off); 247 block_table = (daddr_t *) (bp + nl[X_BLOCK_TABLE].n_value + off); 248 maxblocknum = *block_count_p; 249 250 if (verbose) { 251 printf("%s: entry point %#x\n", fname, eh.a_entry); 252 printf("proto bootblock size %ld\n", *size); 253 printf("room for %d filesystem blocks at %#x\n", 254 maxblocknum, nl[X_BLOCK_TABLE].n_value); 255 } 256 257 close(fd); 258 if (!hflag) 259 bp += sizeof(struct exec); 260 return bp; 261 262 bad: 263 if (bp) 264 free(bp); 265 if (fd >= 0) 266 close(fd); 267 return NULL; 268 } 269 270 static void 271 devread(fd, buf, blk, size, msg) 272 int fd; 273 void *buf; 274 daddr_t blk; 275 size_t size; 276 char *msg; 277 { 278 if (lseek(fd, dbtob(blk), SEEK_SET) != dbtob(blk)) 279 err(1, "%s: devread: lseek", msg); 280 281 if (read(fd, buf, size) != size) 282 err(1, "%s: devread: read", msg); 283 } 284 285 static char sblock[SBSIZE]; 286 287 int 288 loadblocknums(boot, devfd) 289 char *boot; 290 int devfd; 291 { 292 int i, fd; 293 struct stat statbuf; 294 struct statfs statfsbuf; 295 struct fs *fs; 296 char *buf; 297 daddr_t blk, *ap; 298 struct dinode *ip; 299 int ndb; 300 301 /* 302 * Open 2nd-level boot program and record the block numbers 303 * it occupies on the filesystem represented by `devfd'. 304 */ 305 306 /* Make sure the (probably new) boot file is on disk. */ 307 sync(); sleep(1); 308 309 if ((fd = open(boot, O_RDONLY)) < 0) 310 err(1, "open: %s", boot); 311 312 if (fstatfs(fd, &statfsbuf) != 0) 313 err(1, "statfs: %s", boot); 314 315 if (strncmp(statfsbuf.f_fstypename, "ffs", MFSNAMELEN) && 316 strncmp(statfsbuf.f_fstypename, "ufs", MFSNAMELEN) ) { 317 errx(1, "%s: must be on an FFS filesystem", boot); 318 } 319 320 if (fsync(fd) != 0) 321 err(1, "fsync: %s", boot); 322 323 if (fstat(fd, &statbuf) != 0) 324 err(1, "fstat: %s", boot); 325 326 close(fd); 327 328 /* Read superblock */ 329 devread(devfd, sblock, SBLOCK, SBSIZE, "superblock"); 330 fs = (struct fs *)sblock; 331 332 /* Sanity-check super-block. */ 333 if (fs->fs_magic != FS_MAGIC) 334 errx(1, "Bad magic number in superblock"); 335 if (fs->fs_inopb <= 0) 336 err(1, "Bad inopb=%d in superblock", fs->fs_inopb); 337 338 /* Read inode */ 339 if ((buf = malloc(fs->fs_bsize)) == NULL) 340 errx(1, "No memory for filesystem block"); 341 342 blk = fsbtodb(fs, ino_to_fsba(fs, statbuf.st_ino)); 343 devread(devfd, buf, blk, fs->fs_bsize, "inode"); 344 ip = (struct dinode *)(buf) + ino_to_fsbo(fs, statbuf.st_ino); 345 346 /* 347 * Have the inode. Figure out how many blocks we need. 348 */ 349 ndb = howmany(ip->di_size, fs->fs_bsize); 350 if (ndb > maxblocknum) 351 errx(1, "Too many blocks"); 352 *block_count_p = ndb; 353 *block_size_p = fs->fs_bsize; 354 if (verbose) 355 printf("Will load %d blocks of size %d each.\n", 356 ndb, fs->fs_bsize); 357 358 /* 359 * Get the block numbers; we don't handle fragments 360 */ 361 ap = ip->di_db; 362 for (i = 0; i < NDADDR && *ap && ndb; i++, ap++, ndb--) { 363 blk = fsbtodb(fs, *ap); 364 if (verbose) 365 printf("%d: %d\n", i, blk); 366 block_table[i] = blk; 367 } 368 if (ndb == 0) 369 return 0; 370 371 /* 372 * Just one level of indirections; there isn't much room 373 * for more in the 1st-level bootblocks anyway. 374 */ 375 blk = fsbtodb(fs, ip->di_ib[0]); 376 devread(devfd, buf, blk, fs->fs_bsize, "indirect block"); 377 ap = (daddr_t *)buf; 378 for (; i < NINDIR(fs) && *ap && ndb; i++, ap++, ndb--) { 379 blk = fsbtodb(fs, *ap); 380 if (verbose) 381 printf("%d: %d\n", i, blk); 382 block_table[i] = blk; 383 } 384 385 return 0; 386 } 387 388