Obtained from: Whistle Communications
control program to control the facility of the bootblocks to fetch a default bootstring from a fixed location on the disk. See the manpage for more info.
This commit is contained in:
julian
parent
7dbcea9d7a
commit
6afeabc6cb
9
sbin/i386/nextboot/Makefile
Normal file
9
sbin/i386/nextboot/Makefile
Normal file
@ -0,0 +1,9 @@
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# @(#)Makefile 1.1 (Julian Elischer) 3/28/93
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#
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#
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PROG= nextboot
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SRCS= nextboot.c
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MAN8= nextboot.8
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.include <bsd.prog.mk>
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87
sbin/i386/nextboot/nextboot.8
Normal file
87
sbin/i386/nextboot/nextboot.8
Normal file
@ -0,0 +1,87 @@
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.Dd July 9, 1996
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.Dt NEXTBOOT 8
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.\".Os BSD 4
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.Sh NAME
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.Nm nextboot
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.Nd Install a default bootstring block on the boot disk
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.Sh SYNOPSIS
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.Nm
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.Op Fl b
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.Ar filename bootstring ...
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.Pp
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.Nm
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.Op Fl e
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.Op Fl d
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.Ar filename
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.Bl -tag -width time
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.It Fl b
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Is used for bootstrapping (initially configuring) the nameblock. Without
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this,
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.Nm
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will refuse to write to a block that does not already contain the magic
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number.
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.It Fl d
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temporarily disables an existing name block by changing a bit
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in the magic number.
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.It Fl e
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restores the good magic number on a block disabled by -d.
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.El
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.Sh PROLOGUE
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The FreeBSD program
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.Nm
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controls the actions of the boot blocks at the time of the next boot.
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If compiled with the correct option,
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the boot blocks will check the nameblock for a magic number and a
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default name to use for booting. If compiled to do so they will also
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delete the name from the block, ensuring that if the boot should fail,
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then it will not be tried again. It is the job of /etc/rc to use
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.Nm
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to re-install the string if that boot is found to have succeeded.
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This allows a one-time only boot string to be used for such applications
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as remote debugging, and installation of new, untrusted kernels.
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The nameblock is defined at compile time to be the second physical block
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on the disk.
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.Pp
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.Sh DESCRIPTION
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.Nm
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first checks that the disk has an fdisk table and checks that none of the
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partitions defined in that table include the nameblock. If the name block is
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shown to be unused, it will install the bootstrings given as arguments,
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one after the other, each preceded by a small magic number, and NULL
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terminated. The end of the list of strings is delimited by a sequence of
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0xff bytes. If the boot blocks are compiled to write back the nameblock
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after each boot, it will zero out the supplied names as it uses them,
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one per boot,
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until it reaches the 0xff, at which time it will revert to the compiled in
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boot string. At this time the nameblock will contain only zeroed out names.
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.Pp
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An example of usage might be:
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.Bd -literal
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nextboot -b /dev/rwd0 1:sd(0,a)/kernel.experimental wd(0,a)/kernel.old
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.Ed
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.Pp
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Which would instruct the boot blocks at the next boot,
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to try boot the experimental kernel off the scsi disk.
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If for any reason this failed, the next boot attempt would
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boot the kernel
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.Em /kernel.old
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off the IDE drive. (assuming the write-back option were enabled) If this
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in turn failed. the compiled in default would be used.
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.Pp
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If the write-back feature is disabled, the nextboot program is a convenient way
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to change the default boot string. Note, that should the file specified in
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the nameblock be non-existant, then the name compiled into the boot blocks
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will be used for the boot rather than the next name in the nameblock. The
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nameblock is only consulted ONCE per boot.
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.Sh SEE ALSO
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.Xr boot 8
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.Xr disklabel 8
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.Xr fdisk 8
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.Sh BUGS
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The entire program should be made more user-friendly.
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.Pp
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Whether to write back or not should be specified at run-time in the nameblock
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so that the boot blocks need not be altered to get this feature.
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.Pp
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232
sbin/i386/nextboot/nextboot.c
Normal file
232
sbin/i386/nextboot/nextboot.c
Normal file
@ -0,0 +1,232 @@
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/*
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* Copyright (c) 1996 Whistle Communications
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* Whistle Communications allows free use of this software in its "as is"
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* condition. Whistle Communications disclaims any liability of any kind for
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* any damages whatsoever resulting from the use of this software.
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*/
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#include <sys/types.h>
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#include <sys/disklabel.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <unistd.h>
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struct mboot
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{
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unsigned char padding[2]; /* force the longs to be long alligned */
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unsigned char bootinst[DOSPARTOFF];
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struct dos_partition parts[4];
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unsigned short int signature;
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};
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struct mboot mboot;
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#define NAMEBLOCK 1 /* 2nd block */
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#define BLOCKSIZE 512
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#define ENABLE_MAGIC 0xdeafc0de
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#define DISABLE_MAGIC 0xdeadc0de
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static int bflag;
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static int eflag;
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static int dflag;
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static int nameblock = NAMEBLOCK;
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char * myname;
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#define BOOT_MAGIC 0xAA55
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static void usage(void) {
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printf (" usage: %s [-b] device bootstring [bootstring] ...\n"
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,myname);
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printf (" or: %s {-e,-d} device \n"
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,myname);
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printf (" flags are mutually exclusive\n");
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exit(1);
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}
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main (int argc, char** argv)
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{
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int fd = -1;
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char namebuf[1024], *cp = namebuf;
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int i,j;
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int ch;
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int part;
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bflag = 0;
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myname = argv[0];
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while ((ch = getopt(argc, argv, "bde")) != EOF) {
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switch(ch) {
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case 'b':
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bflag = 1;
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break;
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case 'd':
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dflag = 1;
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break;
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case 'e':
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eflag = 1;
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break;
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case '?':
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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 ( (dflag + eflag + bflag) > 1 ) {
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usage();
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}
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if (dflag + eflag){
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if(argc != 1 ) {
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usage();
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}
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} else {
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if (argc <2) {
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usage();
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}
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}
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if ((fd = open(argv[0], O_RDWR, 0)) < 0) {
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perror("open");
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printf ("file: %s\n",argv[0]);
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usage();
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}
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argc--;
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argv++;
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/*******************************************
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* Check that we have an MBR
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*/
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if (lseek(fd,0,0) == -1) {
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perror("lseek");
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exit(1);
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}
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if (read (fd,&mboot.bootinst[0],BLOCKSIZE ) != BLOCKSIZE) {
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perror("read0");
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exit(1);
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}
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if(mboot.signature != (unsigned short)BOOT_MAGIC) {
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printf(" no fdisk part.. not touching block 1\n");
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exit(1);
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}
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/*******************************************
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* And check that none of the partitions in it cover the name block;
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*/
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for ( part = 0; part < 4; part++) {
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if( mboot.parts[part].dp_size
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&& (mboot.parts[part].dp_start <= NAMEBLOCK)
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&& (mboot.parts[part].dp_start
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+ mboot.parts[part].dp_size > NAMEBLOCK)) {
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printf(" Name sector lies within a Bios partition.\n");
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printf(" Aborting write.\n");
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exit(1);
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}
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}
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/*******************************************
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* Now check the name sector itself to see if it's been initialised.
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*/
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if (lseek(fd,NAMEBLOCK * BLOCKSIZE,0) == -1) {
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perror("lseek");
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exit(1);
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}
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if ( read (fd,namebuf,BLOCKSIZE ) != BLOCKSIZE) {
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perror("read1");
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exit(1);
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}
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/*******************************************
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* check if we are just enabling or disabling
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* Remember the flags are exlusive..
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*/
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if(!bflag) { /* don't care what's there if bflag is set */
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switch(*(unsigned long *)cp)
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{
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case DISABLE_MAGIC:
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case ENABLE_MAGIC:
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break;
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default:
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fprintf(stderr,
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"namesector not initialised.."
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"use the -b flag..\n");
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exit(1);
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}
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}
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/*******************************************
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* If the z or r flag is set, damage or restore the magic number..
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* to disable/enable the feature
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*/
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if(dflag) {
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*(unsigned long *)cp = DISABLE_MAGIC;
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} else {
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*(unsigned long *)cp = ENABLE_MAGIC;
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}
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if ((!dflag) && (!eflag)) {
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/*******************************************
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* Create a new namesector in ram
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*/
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cp += 4;
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for ( i = 0 ; i < argc ; i++ ) {
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*cp++ = 'D';
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*cp++ = 'N';
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j = strlen(argv[i]);
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strncpy(cp,argv[i],j);
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cp += j;
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*cp++ = 0;
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}
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*cp++ = 0xff;
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*cp++ = 0xff;
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*cp++ = 0xff;
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namebuf[BLOCKSIZE-1] = 0; /* paranoid */
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namebuf[BLOCKSIZE] = 0xff;
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}
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/*******************************************
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* write it to disk.
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*/
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if (lseek(fd,NAMEBLOCK * BLOCKSIZE,0) == -1) {
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perror("lseek");
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exit(1);
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}
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if(write (fd,namebuf,BLOCKSIZE ) != BLOCKSIZE) {
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perror("write");
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exit(1);
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}
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#if 0
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/*******************************************
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* just to be safe/paranoid.. read it back..
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* and print it..
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*/
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if (lseek(fd,NAMEBLOCK * BLOCKSIZE,0) == -1) {
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perror("lseek (second) ");
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exit(1);
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}
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read (fd,namebuf,512);
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for (i = 0;i< 16;i++) {
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for ( j = 0; j < 16; j++) {
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printf("%02x ",(unsigned char )namebuf[(i*16) + j ]);
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}
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printf("\n");
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}
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#endif
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exit(0);
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}
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9
sbin/nextboot/Makefile
Normal file
9
sbin/nextboot/Makefile
Normal file
@ -0,0 +1,9 @@
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# @(#)Makefile 1.1 (Julian Elischer) 3/28/93
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||||
#
|
||||
#
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PROG= nextboot
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SRCS= nextboot.c
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MAN8= nextboot.8
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.include <bsd.prog.mk>
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87
sbin/nextboot/nextboot.8
Normal file
87
sbin/nextboot/nextboot.8
Normal file
@ -0,0 +1,87 @@
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.Dd July 9, 1996
|
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.Dt NEXTBOOT 8
|
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.\".Os BSD 4
|
||||
.Sh NAME
|
||||
.Nm nextboot
|
||||
.Nd Install a default bootstring block on the boot disk
|
||||
.Sh SYNOPSIS
|
||||
.Nm
|
||||
.Op Fl b
|
||||
.Ar filename bootstring ...
|
||||
.Pp
|
||||
.Nm
|
||||
.Op Fl e
|
||||
.Op Fl d
|
||||
.Ar filename
|
||||
.Bl -tag -width time
|
||||
.It Fl b
|
||||
Is used for bootstrapping (initially configuring) the nameblock. Without
|
||||
this,
|
||||
.Nm
|
||||
will refuse to write to a block that does not already contain the magic
|
||||
number.
|
||||
.It Fl d
|
||||
temporarily disables an existing name block by changing a bit
|
||||
in the magic number.
|
||||
.It Fl e
|
||||
restores the good magic number on a block disabled by -d.
|
||||
.El
|
||||
.Sh PROLOGUE
|
||||
The FreeBSD program
|
||||
.Nm
|
||||
controls the actions of the boot blocks at the time of the next boot.
|
||||
If compiled with the correct option,
|
||||
the boot blocks will check the nameblock for a magic number and a
|
||||
default name to use for booting. If compiled to do so they will also
|
||||
delete the name from the block, ensuring that if the boot should fail,
|
||||
then it will not be tried again. It is the job of /etc/rc to use
|
||||
.Nm
|
||||
to re-install the string if that boot is found to have succeeded.
|
||||
This allows a one-time only boot string to be used for such applications
|
||||
as remote debugging, and installation of new, untrusted kernels.
|
||||
The nameblock is defined at compile time to be the second physical block
|
||||
on the disk.
|
||||
.Pp
|
||||
.Sh DESCRIPTION
|
||||
.Nm
|
||||
first checks that the disk has an fdisk table and checks that none of the
|
||||
partitions defined in that table include the nameblock. If the name block is
|
||||
shown to be unused, it will install the bootstrings given as arguments,
|
||||
one after the other, each preceded by a small magic number, and NULL
|
||||
terminated. The end of the list of strings is delimited by a sequence of
|
||||
0xff bytes. If the boot blocks are compiled to write back the nameblock
|
||||
after each boot, it will zero out the supplied names as it uses them,
|
||||
one per boot,
|
||||
until it reaches the 0xff, at which time it will revert to the compiled in
|
||||
boot string. At this time the nameblock will contain only zeroed out names.
|
||||
.Pp
|
||||
An example of usage might be:
|
||||
.Bd -literal
|
||||
nextboot -b /dev/rwd0 1:sd(0,a)/kernel.experimental wd(0,a)/kernel.old
|
||||
.Ed
|
||||
.Pp
|
||||
Which would instruct the boot blocks at the next boot,
|
||||
to try boot the experimental kernel off the scsi disk.
|
||||
If for any reason this failed, the next boot attempt would
|
||||
boot the kernel
|
||||
.Em /kernel.old
|
||||
off the IDE drive. (assuming the write-back option were enabled) If this
|
||||
in turn failed. the compiled in default would be used.
|
||||
.Pp
|
||||
If the write-back feature is disabled, the nextboot program is a convenient way
|
||||
to change the default boot string. Note, that should the file specified in
|
||||
the nameblock be non-existant, then the name compiled into the boot blocks
|
||||
will be used for the boot rather than the next name in the nameblock. The
|
||||
nameblock is only consulted ONCE per boot.
|
||||
|
||||
|
||||
.Sh SEE ALSO
|
||||
.Xr boot 8
|
||||
.Xr disklabel 8
|
||||
.Xr fdisk 8
|
||||
.Sh BUGS
|
||||
The entire program should be made more user-friendly.
|
||||
.Pp
|
||||
Whether to write back or not should be specified at run-time in the nameblock
|
||||
so that the boot blocks need not be altered to get this feature.
|
||||
.Pp
|
||||
232
sbin/nextboot/nextboot.c
Normal file
232
sbin/nextboot/nextboot.c
Normal file
@ -0,0 +1,232 @@
|
||||
|
||||
/*
|
||||
* Copyright (c) 1996 Whistle Communications
|
||||
* All Rights Reserved.
|
||||
*
|
||||
* Permission to use, copy, modify and distribute this software and its
|
||||
* documentation is hereby granted, provided that both the copyright
|
||||
* notice and this permission notice appear in all copies of the
|
||||
* software, derivative works or modified versions, and any portions
|
||||
* thereof, and that both notices appear in supporting documentation.
|
||||
*
|
||||
* Whistle Communications allows free use of this software in its "as is"
|
||||
* condition. Whistle Communications disclaims any liability of any kind for
|
||||
* any damages whatsoever resulting from the use of this software.
|
||||
*/
|
||||
|
||||
|
||||
#include <sys/types.h>
|
||||
#include <sys/disklabel.h>
|
||||
#include <stdio.h>
|
||||
#include <string.h>
|
||||
#include <errno.h>
|
||||
#include <sys/stat.h>
|
||||
#include <sys/ioctl.h>
|
||||
#include <fcntl.h>
|
||||
#include <unistd.h>
|
||||
#include <stdlib.h>
|
||||
#include <unistd.h>
|
||||
|
||||
struct mboot
|
||||
{
|
||||
unsigned char padding[2]; /* force the longs to be long alligned */
|
||||
unsigned char bootinst[DOSPARTOFF];
|
||||
struct dos_partition parts[4];
|
||||
unsigned short int signature;
|
||||
};
|
||||
struct mboot mboot;
|
||||
|
||||
#define NAMEBLOCK 1 /* 2nd block */
|
||||
#define BLOCKSIZE 512
|
||||
#define ENABLE_MAGIC 0xdeafc0de
|
||||
#define DISABLE_MAGIC 0xdeadc0de
|
||||
static int bflag;
|
||||
static int eflag;
|
||||
static int dflag;
|
||||
static int nameblock = NAMEBLOCK;
|
||||
|
||||
char * myname;
|
||||
#define BOOT_MAGIC 0xAA55
|
||||
|
||||
static void usage(void) {
|
||||
printf (" usage: %s [-b] device bootstring [bootstring] ...\n"
|
||||
,myname);
|
||||
printf (" or: %s {-e,-d} device \n"
|
||||
,myname);
|
||||
printf (" flags are mutually exclusive\n");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
main (int argc, char** argv)
|
||||
{
|
||||
int fd = -1;
|
||||
char namebuf[1024], *cp = namebuf;
|
||||
int i,j;
|
||||
int ch;
|
||||
int part;
|
||||
|
||||
bflag = 0;
|
||||
myname = argv[0];
|
||||
while ((ch = getopt(argc, argv, "bde")) != EOF) {
|
||||
switch(ch) {
|
||||
case 'b':
|
||||
bflag = 1;
|
||||
break;
|
||||
case 'd':
|
||||
dflag = 1;
|
||||
break;
|
||||
case 'e':
|
||||
eflag = 1;
|
||||
break;
|
||||
case '?':
|
||||
default:
|
||||
usage();
|
||||
}
|
||||
}
|
||||
argc -= optind;
|
||||
argv += optind;
|
||||
|
||||
if ( (dflag + eflag + bflag) > 1 ) {
|
||||
usage();
|
||||
}
|
||||
if (dflag + eflag){
|
||||
if(argc != 1 ) {
|
||||
usage();
|
||||
}
|
||||
} else {
|
||||
if (argc <2) {
|
||||
usage();
|
||||
}
|
||||
}
|
||||
if ((fd = open(argv[0], O_RDWR, 0)) < 0) {
|
||||
perror("open");
|
||||
printf ("file: %s\n",argv[0]);
|
||||
usage();
|
||||
}
|
||||
|
||||
argc--;
|
||||
argv++;
|
||||
|
||||
/*******************************************
|
||||
* Check that we have an MBR
|
||||
*/
|
||||
if (lseek(fd,0,0) == -1) {
|
||||
perror("lseek");
|
||||
exit(1);
|
||||
}
|
||||
if (read (fd,&mboot.bootinst[0],BLOCKSIZE ) != BLOCKSIZE) {
|
||||
perror("read0");
|
||||
exit(1);
|
||||
}
|
||||
if(mboot.signature != (unsigned short)BOOT_MAGIC) {
|
||||
printf(" no fdisk part.. not touching block 1\n");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
/*******************************************
|
||||
* And check that none of the partitions in it cover the name block;
|
||||
*/
|
||||
for ( part = 0; part < 4; part++) {
|
||||
if( mboot.parts[part].dp_size
|
||||
&& (mboot.parts[part].dp_start <= NAMEBLOCK)
|
||||
&& (mboot.parts[part].dp_start
|
||||
+ mboot.parts[part].dp_size > NAMEBLOCK)) {
|
||||
printf(" Name sector lies within a Bios partition.\n");
|
||||
printf(" Aborting write.\n");
|
||||
exit(1);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*******************************************
|
||||
* Now check the name sector itself to see if it's been initialised.
|
||||
*/
|
||||
if (lseek(fd,NAMEBLOCK * BLOCKSIZE,0) == -1) {
|
||||
perror("lseek");
|
||||
exit(1);
|
||||
}
|
||||
if ( read (fd,namebuf,BLOCKSIZE ) != BLOCKSIZE) {
|
||||
perror("read1");
|
||||
exit(1);
|
||||
}
|
||||
/*******************************************
|
||||
* check if we are just enabling or disabling
|
||||
* Remember the flags are exlusive..
|
||||
*/
|
||||
if(!bflag) { /* don't care what's there if bflag is set */
|
||||
switch(*(unsigned long *)cp)
|
||||
{
|
||||
case DISABLE_MAGIC:
|
||||
case ENABLE_MAGIC:
|
||||
break;
|
||||
default:
|
||||
fprintf(stderr,
|
||||
"namesector not initialised.."
|
||||
"use the -b flag..\n");
|
||||
exit(1);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*******************************************
|
||||
* If the z or r flag is set, damage or restore the magic number..
|
||||
* to disable/enable the feature
|
||||
*/
|
||||
if(dflag) {
|
||||
*(unsigned long *)cp = DISABLE_MAGIC;
|
||||
} else {
|
||||
*(unsigned long *)cp = ENABLE_MAGIC;
|
||||
}
|
||||
if ((!dflag) && (!eflag)) {
|
||||
/*******************************************
|
||||
* Create a new namesector in ram
|
||||
*/
|
||||
cp += 4;
|
||||
for ( i = 0 ; i < argc ; i++ ) {
|
||||
*cp++ = 'D';
|
||||
*cp++ = 'N';
|
||||
j = strlen(argv[i]);
|
||||
strncpy(cp,argv[i],j);
|
||||
cp += j;
|
||||
*cp++ = 0;
|
||||
}
|
||||
*cp++ = 0xff;
|
||||
*cp++ = 0xff;
|
||||
*cp++ = 0xff;
|
||||
namebuf[BLOCKSIZE-1] = 0; /* paranoid */
|
||||
namebuf[BLOCKSIZE] = 0xff;
|
||||
}
|
||||
|
||||
/*******************************************
|
||||
* write it to disk.
|
||||
*/
|
||||
if (lseek(fd,NAMEBLOCK * BLOCKSIZE,0) == -1) {
|
||||
perror("lseek");
|
||||
exit(1);
|
||||
}
|
||||
if(write (fd,namebuf,BLOCKSIZE ) != BLOCKSIZE) {
|
||||
perror("write");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
#if 0
|
||||
/*******************************************
|
||||
* just to be safe/paranoid.. read it back..
|
||||
* and print it..
|
||||
*/
|
||||
if (lseek(fd,NAMEBLOCK * BLOCKSIZE,0) == -1) {
|
||||
perror("lseek (second) ");
|
||||
exit(1);
|
||||
}
|
||||
read (fd,namebuf,512);
|
||||
for (i = 0;i< 16;i++) {
|
||||
for ( j = 0; j < 16; j++) {
|
||||
printf("%02x ",(unsigned char )namebuf[(i*16) + j ]);
|
||||
}
|
||||
printf("\n");
|
||||
}
|
||||
#endif
|
||||
exit(0);
|
||||
}
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user