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.
 */

#include <sys/types.h>
#include <sys/disklabel.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.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 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";
char *name;

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)
static int dos();
char *get_type();
static int partition = -1;


static int a_flag  = 0;		/* set active partition */
static int i_flag  = 0;		/* replace partition data */
static int u_flag  = 0;		/* update partition data */

static 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
{
 unsigned char 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, "386BSD"}
	,{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)"}
};


main(argc, argv)
char **argv;
{
int	i;

	name = *argv;
	{register char *cp = name;
		while (*cp) if (*cp++ == '/') name = cp;
	}

	for ( argv++ ; --argc ; argv++ ) { register char *token = *argv;
		if (*token++ != '-' || !*token)
			break;
		else { register int flag;
			for ( ; flag = *token++ ; ) {
				switch (flag) {
				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:
					goto usage;
				}
			}
		}
	}

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

	if (open_disk(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 (i = 0; i < NDOSPART; i++)
			change_part(i);
	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 (ok("Should we write new partition table?"))
			write_s0();
	}

	exit(0);

usage:
	printf("fdisk {-a|-i|-r} {disk}\n");
}

print_s0(which)
{
int	i;

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

static struct dos_partition mtpart = { 0 };

print_part(i)
{
struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i;


	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 Meg), 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\tend: cyl %d/ sector %d/ head %d\n"
		,DPCYL(partp->dp_scyl, partp->dp_ssect)
		,DPSECT(partp->dp_ssect)
		,partp->dp_shd
		,DPCYL(partp->dp_ecyl, partp->dp_esect)
		,DPSECT(partp->dp_esect)
		,partp->dp_ehd);
}

init_sector0(start)
{
struct dos_partition *partp = (struct dos_partition *) (&mboot.parts[3]);
int size = disksecs - start;
int rest;

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

	partp->dp_typ = DOSPTYP_386BSD;
	partp->dp_flag = ACTIVE;
	partp->dp_start = start;
	partp->dp_size = size;

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

change_part(i)
{
struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i;

    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 == 3) {
			init_sector0(1);
			printf("\nThe static data for the DOS partition 3 has been reinitialized to:\n");
			print_part(i);
		}
	}

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

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

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

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);
}

change_active(which)
{
int i;
int active = 3, tmp;
struct dos_partition *partp = ((struct dos_partition *) &mboot.parts);

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

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
dos(sec, c, s, h)
int sec;
unsigned char *c, *s, *h;
{
int cy;
int hd;

	cy = sec / ( dos_cylsecs );
	sec = sec - cy * ( dos_cylsecs );

	hd = sec / dos_sectors;
	sec = (sec - hd * dos_sectors) + 1;

	*h = hd;
	*c = cy & 0xff;
	*s = (sec & 0x3f) | ( (cy & 0x300) >> 2);
}

int fd;

	/* Getting device status */

open_disk(u_flag)
{
struct stat 	st;

	if (stat(disk, &st) == -1) {
		fprintf(stderr, "%s: Can't get file status of %s\n",
			name, disk);
		return -1;
	} else if ( !(st.st_mode & S_IFCHR) ) {
		fprintf(stderr,"%s: Device %s is not character special\n",
			name, disk);
		return -1;
	}
	if ((fd = open(disk, u_flag?O_RDWR:O_RDONLY)) == -1) {
		fprintf(stderr,"%s: Can't open device %s\n", name, disk);
		return -1;
	}
	if (get_params(0) == -1) {
		fprintf(stderr, "%s: Can't get disk parameters on %s\n",
			name, disk);
		return -1;
	}
	return fd;
}


read_disk(sector, buf)
{
	lseek(fd,(sector * 512), 0);
	return read(fd, buf, 512);
}

write_disk(sector, buf)
{
	lseek(fd,(sector * 512), 0);
	return write(fd, buf, 512);
}

get_params(verbose)
{

    if (ioctl(fd, DIOCGDINFO, &disklabel) == -1) {
	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 (disksecs);
}


read_s0()
{
	if (read_disk(0, (char *) mboot.bootinst) == -1) {
		fprintf(stderr, "%s: Can't read fdisk partition table\n", name);
		return -1;
	}
	if (mboot.signature != BOOT_MAGIC) {
		fprintf(stderr, "%s: Invalid fdisk partition table found\n",
			name);
		/* So should we initialize things */
		return -1;
	}
	return 0;
}

write_s0()
{
	int	flag;
	if (iotest) {
		print_s0(-1);
		return 0;
	}
	/*
	 * 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)
		perror("ioctl DIOCWLABEL");
	if (write_disk(0, (char *) mboot.bootinst) == -1) {
		fprintf(stderr, "%s: Can't write fdisk partition table\n",
			name);
		return -1;
	flag = 0;
	(void) ioctl(fd, DIOCWLABEL, &flag);
	}
}



ok(str)
char *str;
{
	printf("%s [n] ", str);
	fgets(lbuf, LBUF, stdin);
	lbuf[strlen(lbuf)-1] = 0;

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

decimal(str, num, deflt)
char *str;
int *num;
{
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);
	}

}

hex(str, num, deflt)
char *str;
int *num;
{
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);
	}

}

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;
	}
}

char *get_type(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");
}