xref: /src/sbin/fdisk/fdisk.c

/*
 * 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  Software.Distribution (at) CS.CMU.EDU
 *  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.
 */

#ifndef lint
static char rcsid[] = "$Id: fdisk.c,v 1.4 1994/09/23 04:30:15 mycroft Exp $";
#endif /* not lint */

#include <sys/types.h>
#include <sys/disklabel.h>
#include <sys/ioctl.h>
#include <sys/stat.h>

#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>

#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 Hex(str, ans, tmp) if (hex(str, &tmp, ans)) ans = tmp
#define String(str, ans, len) {char *z = ans; char **dflt = &z; if (string(str, dflt)) strncpy(ans, *dflt, len); }

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

#define SECSIZE 512

char *disk = "/dev/rwd0d";

struct disklabel disklabel;		/* disk parameters */

int cyls, sectors, heads, cylsecs, disksecs;

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 ACTIVE 0x80
#define BOOT_MAGIC 0xAA55

int dos_cyls;
int dos_heads;
int dos_sectors;
int dos_cylsecs;

#define DOSSECT(s,c)	(((s) & 0x3f) | (((c) >> 2) & 0xc0))
#define DOSCYL(c)	((c) & 0xff)
int partition = -1;

int a_flag;		/* set active partition */
int i_flag;		/* replace partition data */
int u_flag;		/* update partition data */

unsigned char bootcode[] = {
0x33, 0xc0, 0xfa, 0x8e, 0xd0, 0xbc, 0x00, 0x7c, 0x8e, 0xc0, 0x8e, 0xd8, 0xfb, 0x8b, 0xf4, 0xbf,
0x00, 0x06, 0xb9, 0x00, 0x02, 0xfc, 0xf3, 0xa4, 0xea, 0x1d, 0x06, 0x00, 0x00, 0xb0, 0x04, 0xbe,
0xbe, 0x07, 0x80, 0x3c, 0x80, 0x74, 0x0c, 0x83, 0xc6, 0x10, 0xfe, 0xc8, 0x75, 0xf4, 0xbe, 0xbd,
0x06, 0xeb, 0x43, 0x8b, 0xfe, 0x8b, 0x14, 0x8b, 0x4c, 0x02, 0x83, 0xc6, 0x10, 0xfe, 0xc8, 0x74,
0x0a, 0x80, 0x3c, 0x80, 0x75, 0xf4, 0xbe, 0xbd, 0x06, 0xeb, 0x2b, 0xbd, 0x05, 0x00, 0xbb, 0x00,
0x7c, 0xb8, 0x01, 0x02, 0xcd, 0x13, 0x73, 0x0c, 0x33, 0xc0, 0xcd, 0x13, 0x4d, 0x75, 0xef, 0xbe,
0x9e, 0x06, 0xeb, 0x12, 0x81, 0x3e, 0xfe, 0x7d, 0x55, 0xaa, 0x75, 0x07, 0x8b, 0xf7, 0xea, 0x00,
0x7c, 0x00, 0x00, 0xbe, 0x85, 0x06, 0x2e, 0xac, 0x0a, 0xc0, 0x74, 0x06, 0xb4, 0x0e, 0xcd, 0x10,
0xeb, 0xf4, 0xfb, 0xeb, 0xfe,
'M', 'i', 's', 's', 'i', 'n', 'g', ' ',
	'o', 'p', 'e', 'r', 'a', 't', 'i', 'n', 'g', ' ', 's', 'y', 's', 't', 'e', 'm', 0,
'E', 'r', 'r', 'o', 'r', ' ', 'l', 'o', 'a', 'd', 'i', 'n', 'g', ' ',
	'o', 'p', 'e', 'r', 'a', 't', 'i', 'n', 'g', ' ', 's', 'y', 's', 't', 'e', 'm', 0,
'I', 'n', 'v', 'a', 'l', 'i', 'd', ' ',
	'p', 'a', 'r', 't', 'i', 't', 'i', 'o', 'n', ' ', 't', 'a', 'b', 'l', 'e', 0,
'A', 'u', 't', 'h', 'o', 'r', ' ', '-', ' ',
	'S', 'i', 'e', 'g', 'm', 'a', 'r', ' ', 'S', 'c', 'h', 'm', 'i', 'd', 't', 0,0,0,

  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0
};

struct part_type {
	int type;
	char *name;
} part_types[] = {
	{0x00, "unused"},
	{0x01, "Primary DOS with 12 bit FAT"},
	{0x02, "XENIX / filesystem"},
	{0x03, "XENIX /usr filesystem"},
	{0x04, "Primary DOS with 16 bit FAT"},
	{0x05, "Extended DOS"},
	{0x06, "Primary 'big' DOS (> 32MB)"},
	{0x07, "OS/2 HPFS, QNX or Advanced UNIX"},
	{0x08, "AIX filesystem"},
	{0x09, "AIX boot partition or Coherent"},
	{0x0A, "OS/2 Boot Manager or OPUS"},
	{0x10, "OPUS"},
	{0x40, "VENIX 286"},
	{0x50, "DM"},
	{0x51, "DM"},
	{0x52, "CP/M or Microport SysV/AT"},
	{0x56, "GB"},
	{0x61, "Speed"},
	{0x63, "ISC UNIX, other System V/386, GNU HURD or Mach"},
	{0x64, "Novell Netware 2.xx"},
	{0x65, "Novell Netware 3.xx"},
	{0x75, "PCIX"},
	{0x80, "Minix 1.1 ... 1.4a"},
	{0x81, "Minix 1.4b ... 1.5.10"},
	{0x82, "Linux"},
	{0x93, "Amoeba filesystem"},
	{0x94, "Amoeba bad block table"},
	{0xA5, "NetBSD"},
	{0xB7, "BSDI BSD/386 filesystem"},
	{0xB8, "BSDI BSD/386 swap"},
	{0xDB, "Concurrent CPM or C.DOS or CTOS"},
	{0xE1, "Speed"},
	{0xE3, "Speed"},
	{0xE4, "Speed"},
	{0xF1, "Speed"},
	{0xF2, "DOS 3.3+ Secondary"},
	{0xF4, "Speed"},
	{0xFF, "BBT (Bad Blocks Table)"},
};

void	usage __P((void));
void	print_s0 __P((int));
void	print_part __P((int));
void	init_sector0 __P((int));
void	change_part __P((int));
void	print_params __P((void));
void	change_active __P((int));
void	get_params_to_use __P((void));
void	dos __P((int, unsigned char *, unsigned char *, unsigned char *));
int	open_disk __P((int));
int	read_disk __P((int, void *));
int	write_disk __P((int, void *));
int	get_params __P((void));
int	read_s0 __P((void));
int	write_s0 __P((void));
int	yesno __P((char *));
int	decimal __P((char *, int *, int));
int	hex __P((char *, int *, int));
int	string __P((char *, char **));
int	type_match __P((const void *, const void *));
char	*get_type __P((int));

int
main(argc, argv)
	int argc;
	char *argv[];
{
	int ch;
	int part;

	a_flag = i_flag = u_flag = 0;
	while ((ch = getopt(argc, argv, "0123aiu")) != -1)
		switch (ch) {
		case '0':
			partition = 0;
			break;
		case '1':
			partition = 1;
			break;
		case '2':
			partition = 2;
			break;
		case '3':
			partition = 3;
			break;
		case 'a':
			a_flag = 1;
			break;
		case 'i':
			i_flag = 1;
		case 'u':
			u_flag = 1;
			break;
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	if (argc > 0)
		disk = argv[0];

	if (open_disk(a_flag || i_flag || u_flag) < 0)
		exit(1);

	printf("******* Working on device %s *******\n", disk);
	if (u_flag)
		get_params_to_use();
	else
		print_params();

	if (read_s0())
		init_sector0(1);

	printf("Warning: BIOS sector numbering starts with sector 1\n");
	printf("Information from DOS bootblock is:\n");
	if (partition == -1) {
		for (part = 0; part < NDOSPART; part++)
			change_part(part);
	} else
		change_part(partition);

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

	if (u_flag || a_flag) {
		printf("\nWe haven't changed the partition table yet.  ");
		printf("This is your last chance.\n");
		print_s0(-1);
		if (yesno("Should we write new partition table?"))
			write_s0();
	}

	exit(0);
}

void
usage()
{

	(void)fprintf(stderr, "usage: fdisk [-aiu] [-0|-1|-2|-3] [device]\n");
	exit(1);
}

void
print_s0(which)
	int which;
{
	int part;

	print_params();
	printf("Information from DOS bootblock is:\n");
	if (which == -1) {
		for (part = 0; part < NDOSPART; part++)
			printf("%d: ", part), print_part(part);
	} else
		print_part(which);
}

static struct dos_partition mtpart = { 0 };

void
print_part(part)
	int part;
{
	struct dos_partition *partp;

	partp = &mboot.parts[part];
	if (!bcmp(partp, &mtpart, sizeof(struct dos_partition))) {
		printf("<UNUSED>\n");
		return;
	}
	printf("sysid %d,(%s)\n", partp->dp_typ, get_type(partp->dp_typ));
	printf("    start %d, size %d (%d MB), flag %x\n",
	    partp->dp_start, partp->dp_size,
	    partp->dp_size * 512 / (1024 * 1024), partp->dp_flag);
	printf("\tbeg: cyl %d/ sector %d/ head %d;\n",
	    DPCYL(partp->dp_scyl, partp->dp_ssect), DPSECT(partp->dp_ssect),
	    partp->dp_shd);
	printf("\tend: cyl %d/ sector %d/ head %d\n",
	    DPCYL(partp->dp_ecyl, partp->dp_esect), DPSECT(partp->dp_esect),
	    partp->dp_ehd);
}

void
init_sector0(start)
	int start;
{
	struct dos_partition *partp;

	memcpy(mboot.bootinst, bootcode, sizeof(bootcode));
	mboot.signature = BOOT_MAGIC;

	partp = &mboot.parts[3];
	partp->dp_typ = DOSPTYP_386BSD;
	partp->dp_flag = ACTIVE;
	partp->dp_start = start;
	partp->dp_size = disksecs - start;

	dos(partp->dp_start,
	    &partp->dp_scyl, &partp->dp_shd, &partp->dp_ssect);
	dos(partp->dp_start + partp->dp_size - 1,
	    &partp->dp_ecyl, &partp->dp_ehd, &partp->dp_esect);
}

void
change_part(part)
	int part;
{
	struct dos_partition *partp;
	int tmp;

	partp = &mboot.parts[part];

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

	if (!u_flag || !yesno("Do you want to change it?"))
		return;

	if (i_flag) {
		memset(partp, '\0', sizeof(*partp));
		if (part == 3) {
			init_sector0(1);
			printf("\nThe static data for the DOS partition 3 has been reinitialized to:\n");
			print_part(part);
		}
	}

	do {
		Decimal("sysid", partp->dp_typ, tmp);
		Decimal("start", partp->dp_start, tmp);
		Decimal("size", partp->dp_size, tmp);

		if (yesno("Explicitly specifiy 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_shd = thd;
			partp->dp_ssect = DOSSECT(tsec, tcyl);

			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_ehd = thd;
			partp->dp_esect = DOSSECT(tsec, tcyl);
		} else {
			dos(partp->dp_start,
			    &partp->dp_scyl, &partp->dp_shd, &partp->dp_ssect);
			dos(partp->dp_start + partp->dp_size - 1,
			    &partp->dp_ecyl, &partp->dp_ehd, &partp->dp_esect);
		}

		print_part(part);
	} while (!yesno("Are we happy with this entry?"));
}

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_sectors > 63 || dos_cyls > 1023 || dos_heads > 255)
		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);
}

void
change_active(which)
	int which;
{
	struct dos_partition *partp;
	int part;
	int active = 3, tmp;

	partp = &mboot.parts[0];

	if (a_flag && which != -1)
		active = which;
	else {
		for (part = 0; part < NDOSPART; part++)
			if (partp[part].dp_flag & ACTIVE)
				active = part;
	}
	if (yesno("Do you want to change the active partition?")) {
		do {
			Decimal("active partition", active, tmp);
		} while (!yesno("Are you happy with this choice?"));
	}
	for (part = 0; part < NDOSPART; part++)
		partp[part].dp_flag &= ~ACTIVE;
	partp[active].dp_flag |= ACTIVE;
}

void
get_params_to_use()
{
	int tmp;

	print_params();
	if (yesno("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 (!yesno("Are you happy with this choice?"));
	}
}

/***********************************************\
* Change real numbers into strange dos numbers	*
\***********************************************/
void
dos(sect, cylp, hdp, sectp)
	int sect;
	unsigned char *cylp, *hdp, *sectp;
{
	int cyl, hd;

	cyl = sect / dos_cylsecs;
	sect -= cyl * dos_cylsecs;

	hd = sect / dos_sectors;
	sect -= hd * dos_sectors;

	*cylp = DOSCYL(cyl);
	*hdp = hd;
	*sectp = DOSSECT(sect + 1, cyl);
}

int fd;

int
open_disk(u_flag)
	int u_flag;
{
	struct stat st;

	if ((fd = open(disk, u_flag ? O_RDWR : O_RDONLY)) == -1) {
		warn("%s", disk);
		return (-1);
	}
	if (fstat(fd, &st) == -1) {
		close(fd);
		warn("%s", disk);
		return (-1);
	}
	if (!S_ISCHR(st.st_mode)) {
		close(fd);
		warnx("%s is not a character device", disk);
		return (-1);
	}
	if (get_params() == -1) {
		close(fd);
		return (-1);
	}
	return (0);
}

int
read_disk(sector, buf)
	int sector;
	void *buf;
{

	if (lseek(fd, (off_t)(sector * 512), 0) == -1)
		return (-1);
	return (read(fd, buf, 512));
}

int
write_disk(sector, buf)
	int sector;
	void *buf;
{

	if (lseek(fd, (off_t)(sector * 512), 0) == -1)
		return (-1);
	return (write(fd, buf, 512));
}

int
get_params()
{

	if (ioctl(fd, DIOCGDINFO, &disklabel) == -1) {
		warn("DIOCGDINFO");
		return (-1);
	}

	dos_cyls = cyls = disklabel.d_ncylinders;
	dos_heads = heads = disklabel.d_ntracks;
	dos_sectors = sectors = disklabel.d_nsectors;
	dos_cylsecs = cylsecs = heads * sectors;
	disksecs = cyls * heads * sectors;

	return (0);
}

int
read_s0()
{

	if (read_disk(0, mboot.bootinst) == -1) {
		warn("can't read fdisk partition table");
		return (-1);
	}
	if (mboot.signature != BOOT_MAGIC) {
		warn("invalid fdisk partition table found");
		/* So should we initialize things? */
		return (-1);
	}
	return (0);
}

int
write_s0()
{
	int flag;

	/*
	 * write enable label sector before write (if necessary),
	 * disable after writing.
	 * needed if the disklabel protected area also protects
	 * sector 0. (e.g. empty disk)
	 */
	flag = 1;
	if (ioctl(fd, DIOCWLABEL, &flag) < 0)
		warn("DIOCWLABEL");
	if (write_disk(0, mboot.bootinst) == -1) {
		warn("can't write fdisk partition table");
		return -1;
	}
	flag = 0;
	if (ioctl(fd, DIOCWLABEL, &flag) < 0)
		warn("DIOCWLABEL");
}

int
yesno(str)
	char *str;
{
	int ch, first;

	printf("%s [n] ", str);

	first = ch = getchar();
	while (ch != '\n' && ch != EOF)
		ch = getchar();
	return (first == 'y' || first == 'Y');
}

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

	while (1) {
		printf("Supply a decimal value for \"%s\" [%d] ", str, deflt);
		fgets(lbuf, LBUF, stdin);
		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);
	}

}

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

	while (1) {
		printf("Supply a hex value for \"%s\" [%x] ", str, deflt);
		fgets(lbuf, LBUF, stdin);
		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 << 4) + c - '0';
			else if (c <= 'f' && c >= 'a')
				acc = (acc << 4) + c - 'a' + 10;
			else if (c <= 'F' && c >= 'A')
				acc = (acc << 4) + c - 'A' + 10;
			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 hex number.  Try again\n",
				lbuf);
	}

}

int
string(str, ans)
	char *str;
	char **ans;
{
	int c;
	char *cp = lbuf;

	while (1) {
		printf("Supply a string value for \"%s\" [%s] ", str, *ans);
		fgets(lbuf, LBUF, stdin);
		lbuf[strlen(lbuf)-1] = 0;

		if (!*lbuf)
			return 0;

		while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
		if (c == '"') {
			c = *++cp;
			*ans = cp;
			while ((c = *cp) && c != '"') cp++;
		} else {
			*ans = cp;
			while ((c = *cp) && c != ' ' && c != '\t') cp++;
		}

		if (c)
			*cp = 0;
		return 1;
	}
}

int
type_match(key, item)
	const void *key, *item;
{
	const int *typep = key;
	const struct part_type *ptr = item;

	if (*typep < ptr->type)
		return (-1);
	if (*typep > ptr->type)
		return (1);
	return (0);
}

char *
get_type(type)
	int type;
{
	struct part_type *ptr;

	ptr = bsearch(&type, part_types,
	    sizeof(part_types) / sizeof(struct part_type),
	    sizeof(struct part_type), type_match);
	if (ptr == 0)
		return ("unknown");
	else
		return (ptr->name);
}