/* $NetBSD: disklabel.c,v 1.7 2016/03/13 08:54:45 tsutsui Exp $ */
/*
* Copyright (c) 1995 Waldi Ravens
* 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 Waldi Ravens.
* 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/types.h>
#include <sys/param.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>
#include <sys/disklabel.h>
#include <machine/ahdilabel.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <err.h>
#if (BBSIZE < MINBBSIZE)
#error BBSIZE is smaller than MINBBSIZE
#endif
struct ahdilabel {
u_int nsecs;
daddr_t bslst;
daddr_t bslend;
u_int nroots;
daddr_t *roots;
u_int nparts;
struct ahdi_part *parts;
};
u_int dkcksum(struct disklabel *);
uint32_t readdisklabel(char *, struct disklabel *);
static int bsd_label(int, off_t, struct disklabel *);
static int ahdi_label(int, uint32_t *, struct disklabel *);
static int ahdi_getparts(int, daddr_t, daddr_t, struct ahdilabel *);
u_int
dkcksum (struct disklabel *dl)
{
uint16_t sum = 0,
*st = (uint16_t *)dl,
*end = (uint16_t *)&dl->d_partitions[dl->d_npartitions];
while (st < end)
sum ^= *st++;
return sum;
}
uint32_t
readdisklabel(char *fn, struct disklabel *dl)
{
int fd, e;
uint32_t bbsec;
memset(dl, 0, sizeof *dl);
if ((fd = open(fn, O_RDONLY)) < 0)
err(EXIT_FAILURE, "%s", fn);
/* Try NetBSD/Atari format first */
if ((e = bsd_label(fd, (off_t)0, dl)) < 0)
err(EXIT_FAILURE, "%s", fn);
if (e == 0)
return 0;
/* Try unprotected AHDI format last */
if ((e = ahdi_label(fd, &bbsec, dl)) < 0)
err(EXIT_FAILURE, "%s", fn);
if (e == 0)
return bbsec;
warnx("%s: Unknown disk label format.", fn);
return NO_BOOT_BLOCK;
}
static int
bsd_label(int fd, off_t offs, struct disklabel *label)
{
struct bootblock bb;
struct disklabel *p;
if (lseek(fd, offs, SEEK_SET) != offs)
return -1;
if (read(fd, &bb, sizeof(bb)) != sizeof(bb))
return -1;
p = (struct disklabel *)bb.bb_label;
if ((offs == 0 && bb.bb_magic != NBDAMAGIC) ||
(offs != 0 && bb.bb_magic != AHDIMAGIC) ||
p->d_npartitions > MAXPARTITIONS ||
p->d_magic2 != DISKMAGIC ||
p->d_magic != DISKMAGIC ||
dkcksum(p) != 0) {
return 1;
}
*label = *p;
return 0;
}
static int
ahdi_label(int fd, uint32_t *bbsec, struct disklabel *label)
{
struct ahdilabel al;
u_int i, j;
int e;
memset(&al, 0, sizeof(al));
if ((e = ahdi_getparts(fd, AHDI_BBLOCK, AHDI_BBLOCK, &al)) != 0)
return e;
/*
* Perform sanity checks.
*/
if (al.bslst == 0 || al.bslend == 0)
return 1;
if (al.nsecs == 0 || al.nparts == 0)
return 1;
if (al.nparts > AHDI_MAXPARTS)
warnx("Too many AHDI partitions (%u).", al.nparts);
for (i = 0; i < al.nparts; ++i) {
struct ahdi_part *p1 = &al.parts[i];
for (j = 0; j < al.nroots; ++j) {
daddr_t aux = al.roots[j];
if (aux >= p1->ap_st && aux <= p1->ap_end)
return 1;
}
for (j = i + 1; j < al.nparts; ++j) {
struct ahdi_part *p2 = &al.parts[j];
if (p1->ap_st >= p2->ap_st && p1->ap_st <= p2->ap_end)
return 1;
if (p2->ap_st >= p1->ap_st && p2->ap_st <= p1->ap_end)
return 1;
}
if (p1->ap_st >= al.bslst && p1->ap_st <= al.bslend)
return 1;
if (al.bslst >= p1->ap_st && al.bslst <= p1->ap_end)
return 1;
}
/*
* Search for a NetBSD boot block
*/
for (i = 0; i < al.nparts; ++i) {
struct ahdi_part *pd = &al.parts[i];
u_int id;
memcpy(&id, &pd->ap_flg, sizeof (id));
if (id == AHDI_PID_NBD || id == AHDI_PID_RAW) {
off_t offs = pd->ap_st * AHDI_BSIZE;
if ((e = bsd_label(fd, offs, label)) < 0)
return e;
if (e == 0) {
*bbsec = pd->ap_st; /* got it */
return 0;
}
}
}
*bbsec = NO_BOOT_BLOCK; /* AHDI label, no NetBSD boot block */
return 0;
}
static int
ahdi_getparts(int fd, daddr_t rsec, daddr_t esec, struct ahdilabel *alab)
{
struct ahdi_part *part, *end;
struct ahdi_root root;
off_t ro;
ro = rsec * AHDI_BSIZE;
if (lseek(fd, ro, SEEK_SET) != ro) {
off_t mend = lseek(fd, 0, SEEK_END);
if (mend == -1 || mend > ro)
return -1;
return 1;
}
if (read(fd, &root, sizeof(root)) != sizeof(root))
return -1;
if (rsec == AHDI_BBLOCK)
end = &root.ar_parts[AHDI_MAXRPD];
else
end = &root.ar_parts[AHDI_MAXARPD];
for (part = root.ar_parts; part < end; ++part) {
u_int id;
memcpy(&id, &part->ap_flg, sizeof (id));
if ((id & 0x01000000) == 0)
continue;
if ((id &= 0x00ffffff) == AHDI_PID_XGM) {
int e;
daddr_t aux = part->ap_st + esec;
alab->roots = realloc(alab->roots,
(alab->nroots + 1) * sizeof(*alab->roots));
alab->roots[alab->nroots++] = aux;
e = ahdi_getparts(fd, aux,
esec == AHDI_BBLOCK ? aux : esec, alab);
if (e != 0)
return e;
} else {
struct ahdi_part *p;
alab->parts = realloc(alab->parts,
(alab->nparts + 1) * sizeof(*alab->parts));
p = &alab->parts[alab->nparts++];
memcpy(&p->ap_flg, &id, sizeof (id));
p->ap_st = part->ap_st + rsec;
p->ap_end = p->ap_st + part->ap_size - 1;
}
}
alab->nsecs = root.ar_hdsize;
alab->bslst = root.ar_bslst;
alab->bslend = root.ar_bslst + root.ar_bslsize - 1;
return 0;
}