* Mach Operating System
* Copyright (c) 1992 Carnegie Mellon University
* 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.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
*  Software Distribution Coordinator  or  [email protected]
*  School of Computer Science
*  Carnegie Mellon University
*  Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sbin/fdisk/fdisk.c,v 1.84.2.1.4.1 2009/04/15 03:14:26 kensmith Exp $");

#include <sys/disk.h>
#include <sys/disklabel.h>
#include <sys/diskmbr.h>
#include <sys/endian.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <ctype.h>
#include <fcntl.h>
#include <err.h>
#include <errno.h>
#include <libgeom.h>
#include <paths.h>
#include <regex.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int iotest;

#define LBUF 100
static char lbuf[LBUF];

/*
*
* Ported to 386bsd by Julian Elischer  Thu Oct 15 20:26:46 PDT 1992
*
* 14-Dec-89  Robert Baron (rvb) at Carnegie-Mellon University
* Copyright (c) 1989 Robert. V. Baron
* Created.
*/

#define Decimal(str, ans, tmp) if (decimal(str, &tmp, ans)) ans = tmp

#define RoundCyl(x) ((((x) + cylsecs - 1) / cylsecs) * cylsecs)

#define MAX_SEC_SIZE 2048 /* maximum section size that is supported */
#define MIN_SEC_SIZE 512 /* the sector size to start sensing at */
static int secsize = 0; /* the sensed sector size */

static char *disk;

static int cyls, sectors, heads, cylsecs, disksecs;

struct mboot {
unsigned char padding[2]; /* force the longs to be long aligned */
unsigned char *bootinst;  /* boot code */
off_t bootinst_size;
struct dos_partition parts[NDOSPART];
};

static struct mboot mboot;
static int fd;

#define ACTIVE 0x80

static uint dos_cyls;
static uint dos_heads;
static uint dos_sectors;
static uint dos_cylsecs;

#define DOSSECT(s,c) ((s & 0x3f) | ((c >> 2) & 0xc0))
#define DOSCYL(c) (c & 0xff)

#define MAX_ARGS 10

static int current_line_number;

static int geom_processed = 0;
static int part_processed = 0;
static int active_processed = 0;

typedef struct cmd {
    char cmd;
    int n_args;
    struct arg {
char argtype;
int arg_val;
    } args[MAX_ARGS];
} CMD;

static int B_flag  = 0; /* replace boot code */
static int I_flag  = 0; /* use entire disk for FreeBSD */
static int a_flag  = 0; /* set active partition */
static char *b_flag = NULL; /* path to boot code */
static int i_flag  = 0; /* replace partition data */
static int q_flag  = 0; /* Be quiet */
static int u_flag  = 0; /* update partition data */
static int s_flag  = 0; /* Print a summary and exit */
static int t_flag  = 0; /* test only */
static char *f_flag = NULL; /* Read config info from file */
static int v_flag  = 0; /* Be verbose */
static int print_config_flag = 0;

static struct part_type
{
unsigned char type;
const char *name;
} part_types[] = {
{0x00, "unused"}
,{0x01, "Primary DOS with 12 bit FAT"}
,{0x02, "XENIX / file system"}
,{0x03, "XENIX /usr file system"}
,{0x04, "Primary DOS with 16 bit FAT (< 32MB)"}
,{0x05, "Extended DOS"}
,{0x06, "Primary 'big' DOS (>= 32MB)"}
,{0x07, "OS/2 HPFS, NTFS, QNX-2 (16 bit) or Advanced UNIX"}
,{0x08, "AIX file system or SplitDrive"}
,{0x09, "AIX boot partition or Coherent"}
,{0x0A, "OS/2 Boot Manager, OPUS or Coherent swap"}
,{0x0B, "DOS or Windows 95 with 32 bit FAT"}
,{0x0C, "DOS or Windows 95 with 32 bit FAT (LBA)"}
,{0x0E, "Primary 'big' DOS (>= 32MB, LBA)"}
,{0x0F, "Extended DOS (LBA)"}
,{0x10, "OPUS"}
,{0x11, "OS/2 BM: hidden DOS with 12-bit FAT"}
,{0x12, "Compaq diagnostics"}
,{0x14, "OS/2 BM: hidden DOS with 16-bit FAT (< 32MB)"}
,{0x16, "OS/2 BM: hidden DOS with 16-bit FAT (>= 32MB)"}
,{0x17, "OS/2 BM: hidden IFS (e.g. HPFS)"}
,{0x18, "AST Windows swapfile"}
,{0x24, "NEC DOS"}
,{0x3C, "PartitionMagic recovery"}
,{0x39, "plan9"}
,{0x40, "VENIX 286"}
,{0x41, "Linux/MINIX (sharing disk with DRDOS)"}
,{0x42, "SFS or Linux swap (sharing disk with DRDOS)"}
,{0x43, "Linux native (sharing disk with DRDOS)"}
,{0x4D, "QNX 4.2 Primary"}
,{0x4E, "QNX 4.2 Secondary"}
,{0x4F, "QNX 4.2 Tertiary"}
,{0x50, "DM (disk manager)"}
,{0x51, "DM6 Aux1 (or Novell)"}
,{0x52, "CP/M or Microport SysV/AT"}
,{0x53, "DM6 Aux3"}
,{0x54, "DM6"}
,{0x55, "EZ-Drive (disk manager)"}
,{0x56, "Golden Bow (disk manager)"}
,{0x5c, "Priam Edisk (disk manager)"} /* according to S. Widlake */
,{0x61, "SpeedStor"}
,{0x63, "System V/386 (such as ISC UNIX), GNU HURD or Mach"}
,{0x64, "Novell Netware/286 2.xx"}
,{0x65, "Novell Netware/386 3.xx"}
,{0x70, "DiskSecure Multi-Boot"}
,{0x75, "PCIX"}
,{0x77, "QNX4.x"}
,{0x78, "QNX4.x 2nd part"}
,{0x79, "QNX4.x 3rd part"}
,{0x80, "Minix until 1.4a"}
,{0x81, "Minix since 1.4b, early Linux partition or Mitac disk manager"}
,{0x82, "Linux swap or Solaris x86"}
,{0x83, "Linux native"}
,{0x84, "OS/2 hidden C: drive"}
,{0x85, "Linux extended"}
,{0x86, "NTFS volume set??"}
,{0x87, "NTFS volume set??"}
,{0x93, "Amoeba file system"}
,{0x94, "Amoeba bad block table"}
,{0x9F, "BSD/OS"}
,{0xA0, "Suspend to Disk"}
,{0xA5, "FreeBSD/NetBSD/386BSD"}
,{0xA6, "OpenBSD"}
,{0xA7, "NeXTSTEP"}
,{0xA9, "NetBSD"}
,{0xAC, "IBM JFS"}
,{0xAF, "HFS+"}
,{0xB7, "BSDI BSD/386 file system"}
,{0xB8, "BSDI BSD/386 swap"}
,{0xBE, "Solaris x86 boot"}
,{0xBF, "Solaris x86 (new)"}
,{0xC1, "DRDOS/sec with 12-bit FAT"}
,{0xC4, "DRDOS/sec with 16-bit FAT (< 32MB)"}
,{0xC6, "DRDOS/sec with 16-bit FAT (>= 32MB)"}
,{0xC7, "Syrinx"}
,{0xDB, "CP/M, Concurrent CP/M, Concurrent DOS or CTOS"}
,{0xE1, "DOS access or SpeedStor with 12-bit FAT extended partition"}
,{0xE3, "DOS R/O or SpeedStor"}
,{0xE4, "SpeedStor with 16-bit FAT extended partition < 1024 cyl."}
,{0xEB, "BeOS file system"}
,{0xEE, "EFI GPT"}
,{0xEF, "EFI System Partition"}
,{0xF1, "SpeedStor"}
,{0xF2, "DOS 3.3+ Secondary"}
,{0xF4, "SpeedStor large partition"}
,{0xFE, "SpeedStor >1024 cyl. or LANstep"}
,{0xFF, "Xenix bad blocks table"}
};

static void print_s0(int which);
static void print_part(int i);
static void init_sector0(unsigned long start);
static void init_boot(void);
static void change_part(int i);
static void print_params(void);
static void change_active(int which);
static void change_code(void);
static void get_params_to_use(void);
static char *get_rootdisk(void);
static void dos(struct dos_partition *partp);
static int open_disk(int flag);
static ssize_t read_disk(off_t sector, void *buf);
static int write_disk(off_t sector, void *buf);
static int get_params(void);
static int read_s0(void);
static int write_s0(void);
static int ok(const char *str);
static int decimal(const char *str, int *num, int deflt);
static const char *get_type(int type);
static int read_config(char *config_file);
static void reset_boot(void);
static int sanitize_partition(struct dos_partition *);
static void usage(void);

int
main(int argc, char *argv[])
{
struct stat sb;
int c, i;
int partition = -1;
struct dos_partition *partp;

while ((c = getopt(argc, argv, "BIab:f:ipqstuv1234")) != -1)
switch (c) {
case 'B':
B_flag = 1;
break;
case 'I':
I_flag = 1;
break;
case 'a':
a_flag = 1;
break;
case 'b':
b_flag = optarg;
break;
case 'f':
f_flag = optarg;
break;
case 'i':
i_flag = 1;
break;
case 'p':
print_config_flag = 1;
break;
case 'q':
q_flag = 1;
break;
case 's':
s_flag = 1;
break;
case 't':
t_flag = 1;
break;
case 'u':
u_flag = 1;
break;
case 'v':
v_flag = 1;
break;
case '1':
case '2':
case '3':
case '4':
partition = c - '0';
break;
default:
usage();
}
if (f_flag || i_flag)
u_flag = 1;
if (t_flag)
v_flag = 1;
argc -= optind;
argv += optind;

if (argc == 0) {
disk = get_rootdisk();
} else {
if (stat(argv[0], &sb) == 0) {
/* OK, full pathname given */
disk = argv[0];
} else if (errno == ENOENT && argv[0][0] != '/') {
/* Try prepending "/dev" */
asprintf(&disk, "%s%s", _PATH_DEV, argv[0]);
if (disk == NULL)
errx(1, "out of memory");
} else {
/* other stat error, let it fail below */
disk = argv[0];
}
}
if (open_disk(u_flag) < 0)
err(1, "cannot open disk %s", disk);

/* (abu)use mboot.bootinst to probe for the sector size */
if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL)
err(1, "cannot allocate buffer to determine disk sector size");
if (read_disk(0, mboot.bootinst) == -1)
errx(1, "could not detect sector size");
free(mboot.bootinst);
mboot.bootinst = NULL;

if (print_config_flag) {
if (read_s0())
err(1, "read_s0");

printf("# %s\n", disk);
printf("g c%d h%d s%d\n", dos_cyls, dos_heads, dos_sectors);

for (i = 0; i < NDOSPART; i++) {
partp = ((struct dos_partition *)&mboot.parts) + i;

if (partp->dp_start == 0 && partp->dp_size == 0)
continue;

printf("p %d 0x%02x %lu %lu\n", i + 1, partp->dp_typ,
    (u_long)partp->dp_start, (u_long)partp->dp_size);

/* Fill flags for the partition. */
if (partp->dp_flag & 0x80)
printf("a %d\n", i + 1);
}
exit(0);
}
if (s_flag) {
if (read_s0())
err(1, "read_s0");
printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads,
    dos_sectors);
printf("Part  %11s %11s Type Flags\n", "Start", "Size");
for (i = 0; i < NDOSPART; i++) {
partp = ((struct dos_partition *) &mboot.parts) + i;
if (partp->dp_start == 0 && partp->dp_size == 0)
continue;
printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1,
    (u_long) partp->dp_start,
    (u_long) partp->dp_size, partp->dp_typ,
    partp->dp_flag);
}
exit(0);
}

printf("******* Working on device %s *******\n",disk);

if (I_flag) {
read_s0();
reset_boot();
partp = (struct dos_partition *) (&mboot.parts[0]);
partp->dp_typ = DOSPTYP_386BSD;
partp->dp_flag = ACTIVE;
partp->dp_start = dos_sectors;
partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs -
    dos_sectors;
dos(partp);
if (v_flag)
print_s0(-1);
if (!t_flag)
write_s0();
exit(0);
}
if (f_flag) {
    if (read_s0() || i_flag)
reset_boot();
    if (!read_config(f_flag))
exit(1);
    if (v_flag)
print_s0(-1);
    if (!t_flag)
write_s0();
} else {
    if(u_flag)
get_params_to_use();
    else
print_params();

    if (read_s0())
init_sector0(dos_sectors);

    printf("Media sector size is %d\n", secsize);
    printf("Warning: BIOS sector numbering starts with sector 1\n");
    printf("Information from DOS bootblock is:\n");
    if (partition == -1)
for (i = 1; i <= NDOSPART; i++)
    change_part(i);
    else
change_part(partition);

    if (u_flag || a_flag)
change_active(partition);

    if (B_flag)
change_code();

    if (u_flag || a_flag || B_flag) {
if (!t_flag) {
    printf("\nWe haven't changed the partition table yet.  ");
    printf("This is your last chance.\n");
}
print_s0(-1);
if (!t_flag) {
    if (ok("Should we write new partition table?"))
write_s0();
} else {
    printf("\n-t flag specified -- partition table not written.\n");
}
    }
}

exit(0);
}

static void
usage()
{
fprintf(stderr, "%s%s",
"usage: fdisk [-BIaipqstu] [-b bootcode] [-1234] [disk]\n",
"      fdisk -f configfile [-itv] [disk]\n");
        exit(1);
}

static void
print_s0(int which)
{
int i;

print_params();
printf("Information from DOS bootblock is:\n");
if (which == -1)
for (i = 1; i <= NDOSPART; i++)
printf("%d: ", i), print_part(i);
else
print_part(which);
}

static struct dos_partition mtpart;

static void
print_part(int i)
{
struct   dos_partition *partp;
u_int64_t part_mb;

partp = ((struct dos_partition *) &mboot.parts) + i - 1;

if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) {
printf("<UNUSED>\n");
return;
}
/*
* Be careful not to overflow.
*/
part_mb = partp->dp_size;
part_mb *= secsize;
part_mb /= (1024 * 1024);
printf("sysid %d (%#04x),(%s)\n", partp->dp_typ, partp->dp_typ,
    get_type(partp->dp_typ));
printf("    start %lu, size %lu (%ju Meg), flag %x%s\n",
(u_long)partp->dp_start,
(u_long)partp->dp_size,
(uintmax_t)part_mb,
partp->dp_flag,
partp->dp_flag == ACTIVE ? " (active)" : "");
printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n"
,DPCYL(partp->dp_scyl, partp->dp_ssect)
,partp->dp_shd
,DPSECT(partp->dp_ssect)
,DPCYL(partp->dp_ecyl, partp->dp_esect)
,partp->dp_ehd
,DPSECT(partp->dp_esect));
}


static void
init_boot(void)
{
#ifndef __ia64__
const char *fname;
int fdesc, n;
struct stat sb;

fname = b_flag ? b_flag : "/boot/mbr";
if ((fdesc = open(fname, O_RDONLY)) == -1 ||
    fstat(fdesc, &sb) == -1)
err(1, "%s", fname);
if ((mboot.bootinst_size = sb.st_size) % secsize != 0)
errx(1, "%s: length must be a multiple of sector size", fname);
if (mboot.bootinst != NULL)
free(mboot.bootinst);
if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL)
errx(1, "%s: unable to allocate read buffer", fname);
if ((n = read(fdesc, mboot.bootinst, mboot.bootinst_size)) == -1 ||
    close(fdesc))
err(1, "%s", fname);
if (n != mboot.bootinst_size)
errx(1, "%s: short read", fname);
#else
if (mboot.bootinst != NULL)
free(mboot.bootinst);
mboot.bootinst_size = secsize;
if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL)
errx(1, "unable to allocate boot block buffer");
memset(mboot.bootinst, 0, mboot.bootinst_size);
le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC);
#endif
}


static void
init_sector0(unsigned long start)
{
struct dos_partition *partp = (struct dos_partition *) (&mboot.parts[0]);

init_boot();

partp->dp_typ = DOSPTYP_386BSD;
partp->dp_flag = ACTIVE;
start = ((start + dos_sectors - 1) / dos_sectors) * dos_sectors;
if(start == 0)
start = dos_sectors;
partp->dp_start = start;
partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - start;

dos(partp);
}

static void
change_part(int i)
{
struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i - 1;

    printf("The data for partition %d is:\n", i);
    print_part(i);

    if (u_flag && ok("Do you want to change it?")) {
int tmp;

if (i_flag) {
bzero((char *)partp, sizeof (struct dos_partition));
if (i == 1) {
init_sector0(1);
printf("\nThe static data for the slice 1 has been reinitialized to:\n");
print_part(i);
}
}

do {
Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp);
Decimal("start", partp->dp_start, tmp);
Decimal("size", partp->dp_size, tmp);
if (!sanitize_partition(partp)) {
warnx("ERROR: failed to adjust; setting sysid to 0");
partp->dp_typ = 0;
}

if (ok("Explicitly specify beg/end address ?"))
{
int tsec,tcyl,thd;
tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect);
thd = partp->dp_shd;
tsec = DPSECT(partp->dp_ssect);
Decimal("beginning cylinder", tcyl, tmp);
Decimal("beginning head", thd, tmp);
Decimal("beginning sector", tsec, tmp);
partp->dp_scyl = DOSCYL(tcyl);
partp->dp_ssect = DOSSECT(tsec,tcyl);
partp->dp_shd = thd;

tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect);
thd = partp->dp_ehd;
tsec = DPSECT(partp->dp_esect);
Decimal("ending cylinder", tcyl, tmp);
Decimal("ending head", thd, tmp);
Decimal("ending sector", tsec, tmp);
partp->dp_ecyl = DOSCYL(tcyl);
partp->dp_esect = DOSSECT(tsec,tcyl);
partp->dp_ehd = thd;
} else
dos(partp);

print_part(i);
} while (!ok("Are we happy with this entry?"));
    }
}

static void
print_params()
{
printf("parameters extracted from in-core disklabel are:\n");
printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n"
,cyls,heads,sectors,cylsecs);
if (dos_cyls > 1023 || dos_heads > 255 || dos_sectors > 63)
printf("Figures below won't work with BIOS for partitions not in cyl 1\n");
printf("parameters to be used for BIOS calculations are:\n");
printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n"
,dos_cyls,dos_heads,dos_sectors,dos_cylsecs);
}

static void
change_active(int which)
{
struct dos_partition *partp = &mboot.parts[0];
int active, i, new, tmp;

active = -1;
for (i = 0; i < NDOSPART; i++) {
if ((partp[i].dp_flag & ACTIVE) == 0)
continue;
printf("Partition %d is marked active\n", i + 1);
if (active == -1)
active = i + 1;
}
if (a_flag && which != -1)
active = which;
else if (active == -1)
active = 1;

if (!ok("Do you want to change the active partition?"))
return;
setactive:
do {
new = active;
Decimal("active partition", new, tmp);
if (new < 1 || new > 4) {
printf("Active partition number must be in range 1-4."
"  Try again.\n");
goto setactive;
}
active = new;
} while (!ok("Are you happy with this choice"));
for (i = 0; i < NDOSPART; i++)
partp[i].dp_flag = 0;
if (active > 0 && active <= NDOSPART)
partp[active-1].dp_flag = ACTIVE;
}

static void
change_code()
{
if (ok("Do you want to change the boot code?"))
init_boot();
}

void
get_params_to_use()
{
int tmp;
print_params();
if (ok("Do you want to change our idea of what BIOS thinks ?"))
{
do
{
Decimal("BIOS's idea of #cylinders", dos_cyls, tmp);
Decimal("BIOS's idea of #heads", dos_heads, tmp);
Decimal("BIOS's idea of #sectors", dos_sectors, tmp);
dos_cylsecs = dos_heads * dos_sectors;
print_params();
}
while(!ok("Are you happy with this choice"));
}
}


/***********************************************\
* Change real numbers into strange dos numbers *
\***********************************************/
static void
dos(struct dos_partition *partp)
{
int cy, sec;
u_int32_t end;

if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) {
memcpy(partp, &mtpart, sizeof(*partp));
return;
}

/* Start c/h/s. */
partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors;
cy = partp->dp_start / dos_cylsecs;
sec = partp->dp_start % dos_sectors + 1;
partp->dp_scyl = DOSCYL(cy);
partp->dp_ssect = DOSSECT(sec, cy);

/* End c/h/s. */
end = partp->dp_start + partp->dp_size - 1;
partp->dp_ehd = end % dos_cylsecs / dos_sectors;
cy = end / dos_cylsecs;
sec = end % dos_sectors + 1;
partp->dp_ecyl = DOSCYL(cy);
partp->dp_esect = DOSSECT(sec, cy);
}

static int
open_disk(int flag)
{
struct stat st;
int rwmode;

if (stat(disk, &st) == -1) {
if (errno == ENOENT)
return -2;
warnx("can't get file status of %s", disk);
return -1;
}
if ( !(st.st_mode & S_IFCHR) )
warnx("device %s is not character special", disk);
rwmode = a_flag || I_flag || B_flag || flag ? O_RDWR : O_RDONLY;
fd = open(disk, rwmode);
if (fd == -1 && errno == EPERM && rwmode == O_RDWR)
fd = open(disk, O_RDONLY);
if (fd == -1 && errno == ENXIO)
return -2;
if (fd == -1) {
warnx("can't open device %s", disk);
return -1;
}
if (get_params() == -1) {
warnx("can't get disk parameters on %s", disk);
return -1;
}
return fd;
}

static ssize_t
read_disk(off_t sector, void *buf)
{

lseek(fd, (sector * 512), 0);
if (secsize == 0)
for (secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE;
    secsize *= 2) {
/* try the read */
int size = read(fd, buf, secsize);
if (size == secsize)
/* it worked so return */
return secsize;
}
else
return read(fd, buf, secsize);

/* we failed to read at any of the sizes */
return -1;
}

static int
write_disk(off_t sector, void *buf)
{
int error;
struct gctl_req *grq;
const char *q;
char fbuf[BUFSIZ];
int i, fdw;

grq = gctl_get_handle();
gctl_ro_param(grq, "verb", -1, "write MBR");
gctl_ro_param(grq, "class", -1, "MBR");
q = strrchr(disk, '/');
if (q == NULL)
q = disk;
else
q++;
gctl_ro_param(grq, "geom", -1, q);
gctl_ro_param(grq, "data", secsize, buf);
q = gctl_issue(grq);
if (q == NULL) {
gctl_free(grq);
return(0);
}
if (!q_flag) /* GEOM errors are benign, not all devices supported */
warnx("%s", q);
gctl_free(grq);

error = pwrite(fd, buf, secsize, (sector * 512));
if (error == secsize)
return (0);

for (i = 1; i < 5; i++) {
sprintf(fbuf, "%ss%d", disk, i);
fdw = open(fbuf, O_RDWR, 0);
if (fdw < 0)
continue;
error = ioctl(fdw, DIOCSMBR, buf);
close(fdw);
if (error == 0)
return (0);
}
warnx("Failed to write sector zero");
return(EINVAL);
}

static int
get_params()
{
int error;
u_int u;
off_t o;

error = ioctl(fd, DIOCGFWSECTORS, &u);
if (error == 0)
sectors = dos_sectors = u;
else
sectors = dos_sectors = 63;

error = ioctl(fd, DIOCGFWHEADS, &u);
if (error == 0)
heads = dos_heads = u;
else
heads = dos_heads = 255;

dos_cylsecs = cylsecs = heads * sectors;
disksecs = cyls * heads * sectors;

error = ioctl(fd, DIOCGSECTORSIZE, &u);
if (error != 0 || u == 0)
u = 512;
else
secsize = u;

error = ioctl(fd, DIOCGMEDIASIZE, &o);
if (error == 0) {
disksecs = o / u;
cyls = dos_cyls = o / (u * dos_heads * dos_sectors);
}

return (disksecs);
}


static int
read_s0()
{
int i;

mboot.bootinst_size = secsize;
if (mboot.bootinst != NULL)
free(mboot.bootinst);
if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) {
warnx("unable to allocate buffer to read fdisk "
      "partition table");
return -1;
}
if (read_disk(0, mboot.bootinst) == -1) {
warnx("can't read fdisk partition table");
return -1;
}
if (le16dec(&mboot.bootinst[DOSMAGICOFFSET]) != DOSMAGIC) {
warnx("invalid fdisk partition table found");
/* So should we initialize things */
return -1;
}
for (i = 0; i < NDOSPART; i++)
dos_partition_dec(
    &mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE],
    &mboot.parts[i]);
return 0;
}

static int
write_s0()
{
int sector, i;

if (iotest) {
print_s0(-1);
return 0;
}
for(i = 0; i < NDOSPART; i++)
dos_partition_enc(&mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE],
    &mboot.parts[i]);
le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC);
for(sector = 0; sector < mboot.bootinst_size / secsize; sector++)
if (write_disk(sector,
      &mboot.bootinst[sector * secsize]) == -1) {
warn("can't write fdisk partition table");
return -1;
}
return(0);
}


static int
ok(const char *str)
{
printf("%s [n] ", str);
fflush(stdout);
if (fgets(lbuf, LBUF, stdin) == NULL)
exit(1);
lbuf[strlen(lbuf)-1] = 0;

if (*lbuf &&
(!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") ||
!strcmp(lbuf, "y") || !strcmp(lbuf, "Y")))
return 1;
else
return 0;
}

static int
decimal(const char *str, int *num, int deflt)
{
int acc = 0, c;
char *cp;

while (1) {
printf("Supply a decimal value for \"%s\" [%d] ", str, deflt);
fflush(stdout);
if (fgets(lbuf, LBUF, stdin) == NULL)
exit(1);
lbuf[strlen(lbuf)-1] = 0;

if (!*lbuf)
return 0;

cp = lbuf;
while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
if (!c)
return 0;
while ((c = *cp++)) {
if (c <= '9' && c >= '0')
acc = acc * 10 + c - '0';
else
break;
}
if (c == ' ' || c == '\t')
while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
if (!c) {
*num = acc;
return 1;
} else
printf("%s is an invalid decimal number.  Try again.\n",
lbuf);
}

}

static const char *
get_type(int type)
{
int numentries = (sizeof(part_types)/sizeof(struct part_type));
int counter = 0;
struct part_type *ptr = part_types;


while(counter < numentries) {
if(ptr->type == type)
return(ptr->name);
ptr++;
counter++;
}
return("unknown");
}


static void
parse_config_line(char *line, CMD *command)
{
    char *cp, *end;

    cp = line;
    while (1) {
memset(command, 0, sizeof(*command));

while (isspace(*cp)) ++cp;
if (*cp == '\0' || *cp == '#')
    break;
command->cmd = *cp++;

/*
* Parse args
*/
    while (1) {
    while (isspace(*cp)) ++cp;
    if (*cp == '#')
break; /* found comment */
    if (isalpha(*cp))
command->args[command->n_args].argtype = *cp++;
    if (!isdigit(*cp))
break; /* assume end of line */
    end = NULL;
    command->args[command->n_args].arg_val = strtol(cp, &end, 0);
    if (cp == end)
break; /* couldn't parse number */
    cp = end;
    command->n_args++;
}
break;
    }
}


static int
process_geometry(CMD *command)
{
    int status = 1, i;

    while (1) {
geom_processed = 1;
    if (part_processed) {
    warnx(
"ERROR line %d: the geometry specification line must occur before\n\
    all partition specifications",
    current_line_number);
    status = 0;
    break;
}
    if (command->n_args != 3) {
    warnx("ERROR line %d: incorrect number of geometry args",
    current_line_number);
    status = 0;
    break;
}
    dos_cyls = 0;
    dos_heads = 0;
    dos_sectors = 0;
    for (i = 0; i < 3; ++i) {
    switch (command->args[i].argtype) {
    case 'c':
dos_cyls = command->args[i].arg_val;
break;
    case 'h':
dos_heads = command->args[i].arg_val;
break;
    case 's':
dos_sectors = command->args[i].arg_val;
break;
    default:
warnx(
"ERROR line %d: unknown geometry arg type: '%c' (0x%02x)",
current_line_number, command->args[i].argtype,
command->args[i].argtype);
status = 0;
break;
    }
}
if (status == 0)
    break;

dos_cylsecs = dos_heads * dos_sectors;

/*
* Do sanity checks on parameter values
*/
    if (dos_cyls == 0) {
    warnx("ERROR line %d: number of cylinders not specified",
    current_line_number);
    status = 0;
}
    if (dos_cyls > 1024) {
    warnx(
"WARNING line %d: number of cylinders (%d) may be out-of-range\n\
    (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\
    is dedicated to FreeBSD)",
    current_line_number, dos_cyls);
}

    if (dos_heads == 0) {
    warnx("ERROR line %d: number of heads not specified",
    current_line_number);
    status = 0;
    } else if (dos_heads > 256) {
    warnx("ERROR line %d: number of heads must be within (1-256)",
    current_line_number);
    status = 0;
}

    if (dos_sectors == 0) {
    warnx("ERROR line %d: number of sectors not specified",
    current_line_number);
    status = 0;
    } else if (dos_sectors > 63) {
    warnx("ERROR line %d: number of sectors must be within (1-63)",
    current_line_number);
    status = 0;
}

break;
    }
    return (status);
}


static int
process_partition(CMD *command)
{
    int status = 0, partition;
    u_int32_t prev_head_boundary, prev_cyl_boundary;
    u_int32_t adj_size, max_end;
    struct dos_partition *partp;

while (1) {
part_processed = 1;
if (command->n_args != 4) {
    warnx("ERROR line %d: incorrect number of partition args",
    current_line_number);
    break;
}
partition = command->args[0].arg_val;
if (partition < 1 || partition > 4) {
    warnx("ERROR line %d: invalid partition number %d",
    current_line_number, partition);
    break;
}
partp = ((struct dos_partition *) &mboot.parts) + partition - 1;
bzero((char *)partp, sizeof (struct dos_partition));
partp->dp_typ = command->args[1].arg_val;
partp->dp_start = command->args[2].arg_val;
partp->dp_size = command->args[3].arg_val;
max_end = partp->dp_start + partp->dp_size;

if (partp->dp_typ == 0) {
    /*
    * Get out, the partition is marked as unused.
    */
    /*
    * Insure that it's unused.
    */
    bzero((char *)partp, sizeof (struct dos_partition));
    status = 1;
    break;
}

/*
* Adjust start upwards, if necessary, to fall on a head boundary.
*/
if (partp->dp_start % dos_sectors != 0) {
    prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors;
    if (max_end < dos_sectors ||
    prev_head_boundary > max_end - dos_sectors) {
/*
* Can't go past end of partition
*/
warnx(
"ERROR line %d: unable to adjust start of partition %d to fall on\n\
    a head boundary",
current_line_number, partition);
break;
    }
    warnx(
"WARNING: adjusting start offset of partition %d\n\
    from %u to %u, to fall on a head boundary",
    partition, (u_int)partp->dp_start,
    (u_int)(prev_head_boundary + dos_sectors));
    partp->dp_start = prev_head_boundary + dos_sectors;
}

/*
* Adjust size downwards, if necessary, to fall on a cylinder
* boundary.
*/
prev_cyl_boundary =
    ((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs;
if (prev_cyl_boundary > partp->dp_start)
    adj_size = prev_cyl_boundary - partp->dp_start;
else {
    warnx(
"ERROR: could not adjust partition to start on a head boundary\n\
    and end on a cylinder boundary.");
    return (0);
}
if (adj_size != partp->dp_size) {
    warnx(
"WARNING: adjusting size of partition %d from %u to %u\n\
    to end on a cylinder boundary",
    partition, (u_int)partp->dp_size, (u_int)adj_size);
    partp->dp_size = adj_size;
}
if (partp->dp_size == 0) {
    warnx("ERROR line %d: size of partition %d is zero",
    current_line_number, partition);
    break;
}

dos(partp);
status = 1;
break;
    }
    return (status);
}


static int
process_active(CMD *command)
{
    int status = 0, partition, i;
    struct dos_partition *partp;

while (1) {
active_processed = 1;
if (command->n_args != 1) {
    warnx("ERROR line %d: incorrect number of active args",
    current_line_number);
    status = 0;
    break;
}
partition = command->args[0].arg_val;
if (partition < 1 || partition > 4) {
    warnx("ERROR line %d: invalid partition number %d",
    current_line_number, partition);
    break;
}
/*
* Reset active partition
*/
partp = ((struct dos_partition *) &mboot.parts);
for (i = 0; i < NDOSPART; i++)
    partp[i].dp_flag = 0;
partp[partition-1].dp_flag = ACTIVE;

status = 1;
break;
    }
    return (status);
}


static int
process_line(char *line)
{
    CMD command;
    int status = 1;

while (1) {
parse_config_line(line, &command);
switch (command.cmd) {
case 0:
    /*
    * Comment or blank line
    */
    break;
case 'g':
    /*
    * Set geometry
    */
    status = process_geometry(&command);
    break;
case 'p':
    status = process_partition(&command);
    break;
case 'a':
    status = process_active(&command);
    break;
default:
    status = 0;
    break;
}
break;
    }
    return (status);
}


static int
read_config(char *config_file)
{
    FILE *fp = NULL;
    int status = 1;
    char buf[1010];

while (1) {
if (strcmp(config_file, "-") != 0) {
    /*
    * We're not reading from stdin
    */
if ((fp = fopen(config_file, "r")) == NULL) {
status = 0;
break;
    }
} else {
    fp = stdin;
}
current_line_number = 0;
while (!feof(fp)) {
    if (fgets(buf, sizeof(buf), fp) == NULL)
break;
    ++current_line_number;
    status = process_line(buf);
    if (status == 0)
break;
    }
break;
    }
if (fp) {
/*
* It doesn't matter if we're reading from stdin, as we've reached EOF
*/
fclose(fp);
    }
    return (status);
}


static void
reset_boot(void)
{
    int i;
    struct dos_partition *partp;

    init_boot();
for (i = 0; i < 4; ++i) {
partp = ((struct dos_partition *) &mboot.parts) + i;
bzero((char *)partp, sizeof (struct dos_partition));
    }
}

static int
sanitize_partition(struct dos_partition *partp)
{
    u_int32_t prev_head_boundary, prev_cyl_boundary;
    u_int32_t max_end, size, start;

    start = partp->dp_start;
    size = partp->dp_size;
    max_end = start + size;
    /* Only allow a zero size if the partition is being marked unused. */
    if (size == 0) {
if (start == 0 && partp->dp_typ == 0)
    return (1);
warnx("ERROR: size of partition is zero");
return (0);
    }
    /* Return if no adjustment is necessary. */
    if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0)
return (1);

    if (start == 0) {
    warnx("WARNING: partition overlaps with partition table");
    if (ok("Correct this automatically?"))
    start = dos_sectors;
    }
    if (start % dos_sectors != 0)
warnx("WARNING: partition does not start on a head boundary");
    if ((start  +size) % dos_sectors != 0)
warnx("WARNING: partition does not end on a cylinder boundary");
    warnx("WARNING: this may confuse the BIOS or some operating systems");
    if (!ok("Correct this automatically?"))
return (1);

    /*
    * Adjust start upwards, if necessary, to fall on a head boundary.
    */
    if (start % dos_sectors != 0) {
prev_head_boundary = start / dos_sectors * dos_sectors;
if (max_end < dos_sectors ||
    prev_head_boundary >= max_end - dos_sectors) {
    /*
    * Can't go past end of partition
    */
    warnx(
    "ERROR: unable to adjust start of partition to fall on a head boundary");
    return (0);
        }
start = prev_head_boundary + dos_sectors;
    }

    /*
    * Adjust size downwards, if necessary, to fall on a cylinder
    * boundary.
    */
    prev_cyl_boundary = ((start + size) / dos_cylsecs) * dos_cylsecs;
    if (prev_cyl_boundary > start)
size = prev_cyl_boundary - start;
    else {
warnx("ERROR: could not adjust partition to start on a head boundary\n\
    and end on a cylinder boundary.");
return (0);
    }

    /* Finally, commit any changes to partp and return. */
    if (start != partp->dp_start) {
warnx("WARNING: adjusting start offset of partition to %u",
    (u_int)start);
partp->dp_start = start;
    }
    if (size != partp->dp_size) {
warnx("WARNING: adjusting size of partition to %u", (u_int)size);
partp->dp_size = size;
    }

    return (1);
}

/*
* Try figuring out the root device's canonical disk name.
* The following choices are considered:
*  /dev/ad0s1a    => /dev/ad0
*  /dev/da0a      => /dev/da0
*  /dev/vinum/root => /dev/vinum/root
*/
static char *
get_rootdisk(void)
{
struct statfs rootfs;
regex_t re;
#define NMATCHES 2
regmatch_t rm[NMATCHES];
char *s;
int rv;

if (statfs("/", &rootfs) == -1)
err(1, "statfs(\"/\")");

if ((rv = regcomp(&re, "^(/dev/[a-z/]+[0-9]+)([sp][0-9]+)?[a-h]?$",
    REG_EXTENDED)) != 0)
errx(1, "regcomp() failed (%d)", rv);
if ((rv = regexec(&re, rootfs.f_mntfromname, NMATCHES, rm, 0)) != 0)
errx(1,
"mounted root fs resource doesn't match expectations (regexec returned %d)",
    rv);
if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL)
errx(1, "out of memory");
memcpy(s, rootfs.f_mntfromname + rm[1].rm_so,
    rm[1].rm_eo - rm[1].rm_so);
s[rm[1].rm_eo - rm[1].rm_so] = 0;

return s;
}]