116 lines
2.2 KiB
C
116 lines
2.2 KiB
C
/* $NetBSD: installboot.c,v 1.3 2002/04/19 16:43:38 heinz Exp $ */
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#include <err.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "../aout2bb/chksum.h"
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/* XXX Must be kept in sync with bbstart.s! */
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#define CMDLN_LOC 0x10
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#define CMDLN_LEN 0x20
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int main(int argc, char *argv[]);
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int main(int argc, char *argv[]){
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char *line;
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char *progname;
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char *bootnam, *devnam;
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char *dline;
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int bootfd, devfd;
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int rc; /* read, write */
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int c; /* getopt */
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int sumlen;
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u_int32_t sum2, sum16;
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u_int32_t block[128*16];
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progname = argv[0];
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while ((c = getopt(argc, argv, "l:")) != -1) {
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switch(c) {
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case 'l':
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line = optarg;
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break;
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default:
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errx(1,
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"usage: %s [-l newcommandline] bootblock device",
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progname);
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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 (argc != 2) {
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errx(1, "usage: %s [-l newcommandline] bootblock device",
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progname);
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/* NOTREACHED */
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}
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bootnam = *argv++;
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devnam = *argv;
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bootfd = open(bootnam, O_RDONLY, 0);
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if (bootfd < 0) {
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err(1, "Can't open bootblock for reading");
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/* NOTREACHED */
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}
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devfd = open(devnam, O_CREAT|O_RDWR, 0666);
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if (devfd < 0) {
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err(1, "Can't open output device for writing");
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/* NOTREACHED */
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}
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rc = read(bootfd, block, sizeof(block));
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if (rc < sizeof(block)) {
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err(1, "Can't read bootblock");
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/* NOTREACHED */
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}
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/* XXX the choices should not be hardcoded */
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sum2 = chksum(block, 1024/4);
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sum16 = chksum(block, 8192/4);
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if (sum16 == 0xffffffff) {
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sumlen = 8192/4;
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} else if (sum2 == 0xffffffff) {
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sumlen = 1024/4;
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} else {
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errx(1, "%s: wrong checksum", bootnam);
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/* NOTREACHED */
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}
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if (sum2 == sum16) {
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warnx("eek - both sums are the same");
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}
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if (line) {
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dline = (char *)&(block[CMDLN_LOC/4]);
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/* XXX keep the default default line in sync with bbstart.s */
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if (strcmp(dline, "netbsd -ASn2") != 0) {
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errx(1, "Old bootblock version? Can't change command line.");
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}
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(void)strncpy(dline, line, CMDLN_LEN-1);
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block[1] = 0;
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block[1] = 0xffffffff - chksum(block, sumlen);
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}
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rc = write(devfd, block, sizeof(block));
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if (rc < sizeof(block)) {
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err(1, "Can't write bootblock");
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/* NOTREACHED */
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}
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exit(1);
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/* NOTREACHED */
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}
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