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|
/* $OpenBSD: installboot.c,v 1.49 2006/02/14 17:16:19 aaron Exp $ */
/* $NetBSD: installboot.c,v 1.5 1995/11/17 23:23:50 gwr Exp $ */
/*
* Copyright (c) 2003 Tom Cosgrove <tom.cosgrove@arches-consulting.com>
* Copyright (c) 1997 Michael Shalayeff
* Copyright (c) 1994 Paul Kranenburg
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Paul Kranenburg.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/disklabel.h>
#include <sys/dkio.h>
#include <sys/ioctl.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ufs/dir.h>
#include <ufs/ffs/fs.h>
#include <sys/reboot.h>
#include <uvm/uvm_extern.h>
#include <sys/sysctl.h>
#include <machine/cpu.h>
#include <machine/biosvar.h>
#include <err.h>
#include <a.out.h>
#include <sys/exec_elf.h>
#include <fcntl.h>
#include <nlist.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <util.h>
struct sym_data {
char *sym_name; /* Must be initialised */
int sym_size; /* And this one */
int sym_set; /* Rest set at runtime */
u_int32_t sym_value;
};
extern char *__progname;
int verbose, nowrite = 0;
char *boot, *proto, *dev, *realdev;
struct sym_data pbr_symbols[] = {
{"_fs_bsize_p", 2},
{"_fs_bsize_s", 2},
{"_fsbtodb", 1},
{"_p_offset", 4},
{"_inodeblk", 4},
{"_inodedbl", 4},
{"_nblocks", 2},
{NULL}
};
#define INODESEG 0x07e0 /* where we will put /boot's inode's block */
#define BOOTSEG 0x07c0 /* biosboot loaded here */
#define INODEOFF ((INODESEG-BOOTSEG) << 4)
static char *loadproto(char *, long *);
static int getbootparams(char *, int, struct disklabel *);
static void devread(int, void *, daddr_t, size_t, char *);
static void sym_set_value(struct sym_data *, char *, u_int32_t);
static void pbr_set_symbols(char *, char *, struct sym_data *);
static void usage(void);
static void
usage(void)
{
fprintf(stderr, "usage: %s [-nv] boot biosboot device\n", __progname);
exit(1);
}
/*
* Read information about /boot's inode and filesystem parameters, then
* put biosboot (partition boot record) on the target drive with these
* parameters patched in.
*/
int
main(int argc, char *argv[])
{
int c;
int devfd;
char *protostore;
long protosize;
struct stat sb;
struct disklabel dl;
struct dos_mbr mbr;
struct dos_partition *dp;
off_t startoff = 0;
while ((c = getopt(argc, argv, "vn")) != -1) {
switch (c) {
case 'n':
/* Do not actually write the bootblock to disk. */
nowrite = 1;
break;
case 'v':
/* Give more information. */
verbose = 1;
break;
default:
usage();
}
}
if (argc - optind < 3)
usage();
boot = argv[optind];
proto = argv[optind + 1];
realdev = dev = argv[optind + 2];
/* Open and check raw disk device. */
if ((devfd = opendev(dev, (nowrite? O_RDONLY:O_RDWR),
OPENDEV_PART, &realdev)) < 0)
err(1, "open: %s", realdev);
if (verbose) {
fprintf(stderr, "boot: %s\n", boot);
fprintf(stderr, "proto: %s\n", proto);
fprintf(stderr, "device: %s\n", realdev);
}
if (ioctl(devfd, DIOCGDINFO, &dl) != 0)
err(1, "disklabel: %s", realdev);
/* Check disklabel. */
if (dl.d_magic != DISKMAGIC)
err(1, "bad disklabel magic=0x%08x", dl.d_magic);
/* Warn on unknown disklabel types. */
if (dl.d_type == 0)
warnx("disklabel type unknown");
/* Load proto blocks into core. */
if ((protostore = loadproto(proto, &protosize)) == NULL)
exit(1);
/* XXX - Paranoia: Make sure size is aligned! */
if (protosize & (DEV_BSIZE - 1))
errx(1, "proto %s bad size=%ld", proto, protosize);
/* Write patched proto bootblock(s) into the superblock. */
if (protosize > SBSIZE - DEV_BSIZE)
errx(1, "proto bootblocks too big");
if (fstat(devfd, &sb) < 0)
err(1, "stat: %s", realdev);
if (!S_ISCHR(sb.st_mode))
errx(1, "%s: not a character device", realdev);
/* Get bootstrap parameters that are to be patched into proto. */
if (getbootparams(boot, devfd, &dl) != 0)
exit(1);
/* Patch the parameters into the proto bootstrap sector. */
pbr_set_symbols(proto, protostore, pbr_symbols);
if (!nowrite) {
/* Sync filesystems (to clean in-memory superblock?). */
sync(); sleep(1);
}
if (dl.d_type != 0 && dl.d_type != DTYPE_FLOPPY &&
dl.d_type != DTYPE_VND) {
if (lseek(devfd, (off_t)DOSBBSECTOR, SEEK_SET) < 0 ||
read(devfd, &mbr, sizeof(mbr)) < sizeof(mbr))
err(4, "can't read master boot record");
if (mbr.dmbr_sign != DOSMBR_SIGNATURE)
errx(1, "broken MBR");
/* Find OpenBSD partition. */
for (dp = mbr.dmbr_parts; dp < &mbr.dmbr_parts[NDOSPART];
dp++) {
if (dp->dp_size && dp->dp_typ == DOSPTYP_OPENBSD) {
startoff = (off_t)dp->dp_start * dl.d_secsize;
fprintf(stderr, "using MBR partition %ld: "
"type %d (0x%02x) offset %d (0x%x)\n",
(long)(dp - mbr.dmbr_parts),
dp->dp_typ, dp->dp_typ,
dp->dp_start, dp->dp_start);
break;
}
}
/* Don't check for old part number, that is ;-p */
if (dp >= &mbr.dmbr_parts[NDOSPART])
errx(1, "no OpenBSD partition");
}
if (!nowrite) {
if (lseek(devfd, startoff, SEEK_SET) < 0 ||
write(devfd, protostore, protosize) != protosize)
err(1, "write bootstrap");
}
(void)close(devfd);
return 0;
}
/*
* Load the prototype boot sector (biosboot) into memory.
*/
static char *
loadproto(char *fname, long *size)
{
int fd;
size_t tdsize; /* text+data size */
char *bp;
Elf_Ehdr eh;
Elf_Word phsize;
Elf_Phdr *ph;
if ((fd = open(fname, O_RDONLY)) < 0)
err(1, "%s", fname);
if (read(fd, &eh, sizeof(eh)) != sizeof(eh))
errx(1, "%s: read failed", fname);
if (!IS_ELF(eh))
errx(1, "%s: bad magic: 0x%02x%02x%02x%02x",
boot,
eh.e_ident[EI_MAG0], eh.e_ident[EI_MAG1],
eh.e_ident[EI_MAG2], eh.e_ident[EI_MAG3]);
/*
* We have to include the exec header in the beginning of
* the buffer, and leave extra space at the end in case
* the actual write to disk wants to skip the header.
*/
/* Program load header. */
if (eh.e_phnum != 1)
errx(1, "%s: %u ELF load sections (only support 1)",
boot, eh.e_phnum);
phsize = eh.e_phnum * sizeof(Elf_Phdr);
ph = malloc(phsize);
if (ph == NULL)
err(1, NULL);
lseek(fd, eh.e_phoff, SEEK_SET);
if (read(fd, ph, phsize) != phsize)
errx(1, "%s: can't read header", boot);
tdsize = ph->p_filesz;
/*
* Allocate extra space here because the caller may copy
* the boot block starting at the end of the exec header.
* This prevents reading beyond the end of the buffer.
*/
if ((bp = calloc(tdsize, 1)) == NULL) {
err(1, NULL);
}
/* Read the rest of the file. */
lseek(fd, ph->p_offset, SEEK_SET);
if (read(fd, bp, tdsize) != tdsize) {
errx(1, "%s: read failed", fname);
}
*size = tdsize; /* not aligned to DEV_BSIZE */
if (verbose) {
fprintf(stderr, "%s: entry point %#x\n", fname, eh.e_entry);
fprintf(stderr, "proto bootblock size %ld\n", *size);
}
close(fd);
return bp;
}
static void
devread(int fd, void *buf, daddr_t blk, size_t size, char *msg)
{
if (lseek(fd, dbtob((off_t)blk), SEEK_SET) != dbtob((off_t)blk))
err(1, "%s: devread: lseek", msg);
if (read(fd, buf, size) != size)
err(1, "%s: devread: read", msg);
}
static char sblock[SBSIZE];
/*
* Read information about /boot's inode, then put this and filesystem
* parameters from the superblock into pbr_symbols.
*/
static int
getbootparams(char *boot, int devfd, struct disklabel *dl)
{
int fd;
struct stat statbuf, sb;
struct statfs statfsbuf;
struct partition *pl;
struct fs *fs;
char *buf;
daddr_t blk, *ap;
struct ufs1_dinode *ip;
int ndb;
int mib[3];
size_t size;
dev_t dev;
/*
* Open 2nd-level boot program and record enough details about
* where it is on the filesystem represented by `devfd'
* (inode block, offset within that block, and various filesystem
* parameters essentially taken from the superblock) for biosboot
* to be able to load it later.
*/
/* Make sure the (probably new) boot file is on disk. */
sync(); sleep(1);
if ((fd = open(boot, O_RDONLY)) < 0)
err(1, "open: %s", boot);
if (fstatfs(fd, &statfsbuf) != 0)
err(1, "statfs: %s", boot);
if (strncmp(statfsbuf.f_fstypename, "ffs", MFSNAMELEN) &&
strncmp(statfsbuf.f_fstypename, "ufs", MFSNAMELEN) )
errx(1, "%s: not on an FFS filesystem", boot);
#if 0
if (read(fd, &eh, sizeof(eh)) != sizeof(eh))
errx(1, "read: %s", boot);
if (!IS_ELF(eh)) {
errx(1, "%s: bad magic: 0x%02x%02x%02x%02x",
boot,
eh.e_ident[EI_MAG0], eh.e_ident[EI_MAG1],
eh.e_ident[EI_MAG2], eh.e_ident[EI_MAG3]);
}
#endif
if (fsync(fd) != 0)
err(1, "fsync: %s", boot);
if (fstat(fd, &statbuf) != 0)
err(1, "fstat: %s", boot);
if (fstat(devfd, &sb) != 0)
err(1, "fstat: %s", realdev);
/* Check devices. */
mib[0] = CTL_MACHDEP;
mib[1] = CPU_CHR2BLK;
mib[2] = sb.st_rdev;
size = sizeof(dev);
if (sysctl(mib, 3, &dev, &size, NULL, 0) >= 0) {
if (statbuf.st_dev / MAXPARTITIONS != dev / MAXPARTITIONS)
errx(1, "cross-device install");
}
pl = &dl->d_partitions[DISKPART(statbuf.st_dev)];
close(fd);
/* Read superblock. */
devread(devfd, sblock, pl->p_offset + SBLOCK, SBSIZE, "superblock");
fs = (struct fs *)sblock;
/* Sanity-check super-block. */
if (fs->fs_magic != FS_MAGIC)
errx(1, "Bad magic number in superblock");
if (fs->fs_inopb <= 0)
err(1, "Bad inopb=%d in superblock", fs->fs_inopb);
/* Read inode. */
if ((buf = malloc(fs->fs_bsize)) == NULL)
err(1, NULL);
blk = fsbtodb(fs, ino_to_fsba(fs, statbuf.st_ino));
devread(devfd, buf, pl->p_offset + blk, fs->fs_bsize, "inode");
ip = (struct ufs1_dinode *)(buf) + ino_to_fsbo(fs, statbuf.st_ino);
/*
* Have the inode. Figure out how many filesystem blocks (not disk
* sectors) there are for biosboot to load.
*/
ndb = howmany(ip->di_size, fs->fs_bsize);
if (ndb <= 0)
errx(1, "No blocks to load");
/*
* Now set the values that will need to go into biosboot
* (the partition boot record, a.k.a. the PBR).
*/
sym_set_value(pbr_symbols, "_fs_bsize_p", (fs->fs_bsize / 16));
sym_set_value(pbr_symbols, "_fs_bsize_s", (fs->fs_bsize / 512));
sym_set_value(pbr_symbols, "_fsbtodb", fs->fs_fsbtodb);
sym_set_value(pbr_symbols, "_p_offset", pl->p_offset);
sym_set_value(pbr_symbols, "_inodeblk",
ino_to_fsba(fs, statbuf.st_ino));
ap = ip->di_db;
sym_set_value(pbr_symbols, "_inodedbl",
((((char *)ap) - buf) + INODEOFF));
sym_set_value(pbr_symbols, "_nblocks", ndb);
if (verbose) {
fprintf(stderr, "%s is %d blocks x %d bytes\n",
boot, ndb, fs->fs_bsize);
fprintf(stderr, "fs block shift %u; part offset %u; "
"inode block %u, offset %ld\n",
fs->fs_fsbtodb, pl->p_offset,
ino_to_fsba(fs, statbuf.st_ino),
((((char *)ap) - buf) + INODEOFF));
}
return 0;
}
static void
sym_set_value(struct sym_data *sym_list, char *sym, u_int32_t value)
{
struct sym_data *p;
for (p = sym_list; p->sym_name != NULL; p++) {
if (strcmp(p->sym_name, sym) == 0)
break;
}
if (p->sym_name == NULL)
errx(1, "%s: no such symbol", sym);
if (p->sym_set)
errx(1, "%s already set", p->sym_name);
p->sym_value = value;
p->sym_set = 1;
}
/*
* Write the parameters stored in sym_list into the in-memory copy of
* the prototype biosboot (proto), ready for it to be written to disk.
*/
static void
pbr_set_symbols(char *fname, char *proto, struct sym_data *sym_list)
{
struct sym_data *sym;
struct nlist *nl;
char *vp;
u_int32_t *lp;
u_int16_t *wp;
u_int8_t *bp;
for (sym = sym_list; sym->sym_name != NULL; sym++) {
if (!sym->sym_set)
errx(1, "%s not set", sym->sym_name);
/* Allocate space for 2; second is null-terminator for list. */
nl = calloc(2, sizeof(struct nlist));
if (nl == NULL)
err(1, NULL);
nl->n_un.n_name = sym->sym_name;
if (nlist(fname, nl) != 0)
errx(1, "%s: symbol %s not found",
fname, sym->sym_name);
if (nl->n_type != (N_TEXT))
errx(1, "%s: %s: wrong type (%x)",
fname, sym->sym_name, nl->n_type);
/* Get a pointer to where the symbol's value needs to go. */
vp = proto + nl->n_value;
switch (sym->sym_size) {
case 4: /* u_int32_t */
lp = (u_int32_t *) vp;
*lp = sym->sym_value;
break;
case 2: /* u_int16_t */
if (sym->sym_value >= 0x10000) /* out of range */
errx(1, "%s: symbol out of range (%u)",
sym->sym_name, sym->sym_value);
wp = (u_int16_t *) vp;
*wp = (u_int16_t) sym->sym_value;
break;
case 1: /* u_int16_t */
if (sym->sym_value >= 0x100) /* out of range */
errx(1, "%s: symbol out of range (%u)",
sym->sym_name, sym->sym_value);
bp = (u_int8_t *) vp;
*bp = (u_int8_t) sym->sym_value;
break;
default:
errx(1, "%s: bad symbol size %d",
sym->sym_name, sym->sym_size);
/* NOTREACHED */
}
free(nl);
}
}
|