266 lines
7.6 KiB
C
266 lines
7.6 KiB
C
/* $NetBSD: installboot.c,v 1.14 1999/04/05 03:07:37 cgd Exp $ */
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/*
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* Copyright (c) 1999 Christopher G. Demetriou. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Christopher G. Demetriou
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* for the NetBSD Project.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h> /* XXX for roundup, howmany */
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#include <sys/stat.h>
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#include <sys/disklabel.h>
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#include <assert.h>
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#include <err.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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static void usage(void);
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static void clr_bootstrap(const char *disk);
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static void set_bootstrap(const char *disk, const char *bootstrap);
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extern char *__progname;
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int verbose, nowrite;
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static void
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usage()
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{
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fprintf(stderr, "usage:\n");
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fprintf(stderr, "\t%s [-n] [-v] disk bootstrap\n", __progname);
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fprintf(stderr, "\t%s [-n] [-v] -c disk\n", __progname);
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exit(EXIT_FAILURE);
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}
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int
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main(int argc, char **argv)
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{
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const char *disk, *bootstrap;
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int c, clearflag;
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clearflag = verbose = nowrite = 0;
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while ((c = getopt(argc, argv, "cnv")) != -1) {
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switch (c) {
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case 'c':
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/* Clear any existing boot block */
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clearflag = 1;
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break;
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case 'n':
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/* Do not actually write the boot file */
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nowrite = 1;
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break;
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case 'v':
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/* Chat */
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verbose = 1;
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break;
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if ((clearflag && argc != 1) || (!clearflag && argc != 2))
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usage();
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disk = argv[0];
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bootstrap = argv[1]; /* NULL if argc == 1 */
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if (verbose) {
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fprintf(stderr, "disk: %s\n", disk);
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fprintf(stderr, "bootstrap: %s\n",
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bootstrap != NULL ? bootstrap : "to be cleared");
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}
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if (sizeof (struct boot_block) != BOOT_BLOCK_BLOCKSIZE)
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errx(EXIT_FAILURE,
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"boot_block structure badly sized (build error)");
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if (clearflag)
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clr_bootstrap(disk);
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else
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set_bootstrap(disk, bootstrap);
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exit(EXIT_SUCCESS);
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}
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static void
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clr_bootstrap(const char *disk)
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{
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struct boot_block bb;
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u_int64_t cksum;
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ssize_t rv;
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int diskfd;
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if ((diskfd = open(disk, nowrite ? O_RDONLY : O_RDWR)) == -1)
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err(EXIT_FAILURE, "open %s", disk);
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rv = pread(diskfd, &bb, sizeof bb, BOOT_BLOCK_OFFSET);
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if (rv == -1)
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err(EXIT_FAILURE, "read %s", disk);
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else if (rv != sizeof bb)
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errx(EXIT_FAILURE, "read %s: short read", disk);
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CHECKSUM_BOOT_BLOCK(&bb, &cksum);
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if (cksum != bb.bb_cksum) {
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fprintf(stderr,
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"old boot block checksum invalid (was %#llx, calculated %#llx)\n",
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(unsigned long long)bb.bb_cksum,
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(unsigned long long)cksum);
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fprintf(stderr, "boot block invalid\n");
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goto done;
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} else if (verbose) {
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fprintf(stderr, "old boot block checksum: %#llx\n",
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(unsigned long long)bb.bb_cksum);
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fprintf(stderr, "old boot block start sector: %#llx\n",
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(unsigned long long)bb.bb_secstart);
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fprintf(stderr, "old boot block size: %#llx\n",
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(unsigned long long)bb.bb_secsize);
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}
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bb.bb_secstart = bb.bb_secsize = 0;
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CHECKSUM_BOOT_BLOCK(&bb, &bb.bb_cksum);
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fprintf(stderr, "new boot block checksum: %#llx\n",
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(unsigned long long)bb.bb_cksum);
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fprintf(stderr, "new boot block start sector: %#llx\n",
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(unsigned long long)bb.bb_secstart);
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fprintf(stderr, "new boot block size: %#llx\n",
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(unsigned long long)bb.bb_secsize);
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if (nowrite) {
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if (verbose)
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fprintf(stderr, "not writing\n");
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goto done;
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}
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if (verbose)
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fprintf(stderr, "writing\n");
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rv = pwrite(diskfd, &bb, sizeof bb, BOOT_BLOCK_OFFSET);
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if (rv == -1)
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err(EXIT_FAILURE, "write %s", disk);
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else if (rv != sizeof bb)
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errx(EXIT_FAILURE, "write %s: short write", disk);
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done:
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(void)close(diskfd);
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}
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static void
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set_bootstrap(const char *disk, const char *bootstrap)
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{
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struct stat bootstrapsb;
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struct boot_block bb;
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int bootstrapfd, diskfd;
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char *bootstrapbuf;
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size_t bootstrapsize;
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ssize_t rv;
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/* Open the input file and check it out */
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if ((bootstrapfd = open(bootstrap, O_RDONLY)) == -1)
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err(EXIT_FAILURE, "open %s", bootstrap);
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if (fstat(bootstrapfd, &bootstrapsb) == -1)
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err(EXIT_FAILURE, "fstat %s", bootstrap);
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if (!S_ISREG(bootstrapsb.st_mode))
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errx(EXIT_FAILURE, "%s must be a regular file", bootstrap);
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/*
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* Allocate a buffer, with space to round up the input file
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* to the next block size boundary, and with space for the boot
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* block.
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*/
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bootstrapsize = roundup(bootstrapsb.st_size, BOOT_BLOCK_BLOCKSIZE);
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bootstrapbuf = malloc(bootstrapsize);
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if (bootstrapbuf == NULL)
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err(EXIT_FAILURE, "allocating buffer to hold bootstrap");
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memset(bootstrapbuf, 0, bootstrapsize);
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/* read the file into the buffer */
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rv = read(bootstrapfd, bootstrapbuf, bootstrapsb.st_size);
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if (rv == -1)
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err(EXIT_FAILURE, "read %s", bootstrap);
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else if (rv != bootstrapsb.st_size)
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errx(EXIT_FAILURE, "read %s: short read", bootstrap);
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(void)close(bootstrapfd);
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if ((diskfd = open(disk, nowrite ? O_RDONLY : O_RDWR)) == -1)
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err(EXIT_FAILURE, "open %s", disk);
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rv = pread(diskfd, &bb, sizeof bb, BOOT_BLOCK_OFFSET);
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if (rv == -1)
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err(EXIT_FAILURE, "read %s", disk);
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else if (rv != sizeof bb)
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errx(EXIT_FAILURE, "read %s: short read", disk);
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/* fill in the updated boot block fields, and checksum boot block */
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bb.bb_secsize = howmany(bootstrapsb.st_size, BOOT_BLOCK_BLOCKSIZE);
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bb.bb_secstart = 1;
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CHECKSUM_BOOT_BLOCK(&bb, &bb.bb_cksum);
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if (verbose) {
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fprintf(stderr, "bootstrap starting sector: %llu\n",
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(unsigned long long)bb.bb_secstart);
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fprintf(stderr, "bootstrap sector count: %llu\n",
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(unsigned long long)bb.bb_secsize);
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fprintf(stderr, "new boot block checksum: %#llx\n",
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(unsigned long long)bb.bb_cksum);
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}
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if (nowrite) {
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if (verbose)
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fprintf(stderr, "not writing\n");
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goto done;
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}
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if (verbose)
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fprintf(stderr, "writing bootstrap\n");
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rv = pwrite(diskfd, bootstrapbuf, bootstrapsize,
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BOOT_BLOCK_OFFSET + BOOT_BLOCK_BLOCKSIZE);
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if (rv == -1)
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err(EXIT_FAILURE, "write %s", disk);
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else if (rv != sizeof bb)
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errx(EXIT_FAILURE, "write %s: short write", disk);
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if (verbose)
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fprintf(stderr, "writing boot block\n");
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rv = pwrite(diskfd, &bb, sizeof bb, BOOT_BLOCK_OFFSET);
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if (rv == -1)
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err(EXIT_FAILURE, "write %s", disk);
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else if (rv != sizeof bb)
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errx(EXIT_FAILURE, "write %s: short write", disk);
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done:
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(void)close(diskfd);
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}
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