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HardenedBSD/sbin/fdisk/fdisk.c
Warner Losh 1d386b48a5 Remove $FreeBSD$: one-line .c pattern 
Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/
2023-08-16 11:54:42 -06:00

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/*
* 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@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/cdefs.h>
#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>
#include "fdisk_mbr_enc.h"
static int iotest;
#define NO_DISK_SECTORS ((u_int32_t)-1)
#define NO_TRACK_CYLINDERS 1023
#define NO_TRACK_HEADS 255
#define NO_TRACK_SECTORS 63
#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, maxval) if (decimal(str, &tmp, ans, maxval)) ans = tmp
#define MAX_SEC_SIZE 65536 /* maximum sector 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;
static u_int32_t disksecs;
struct mboot {
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;
unsigned long arg_val;
char * arg_str;
} 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;
/*
* A list of partition types, probably outdated.
*/
static const char *const part_types[256] = {
[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 DOS, 16 bit FAT (>= 32MB)",
[0x07] = "NTFS, OS/2 HPFS, 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",
[0x1b] = "ASUS Recovery partition (NTFS)",
[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",
[0x6C] = "DragonFlyBSD",
[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",
[0xDE] = "DELL Utilities - FAT filesystem",
[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",
[0xFB] = "VMware VMFS",
[0xFE] = "SpeedStor >1024 cyl. or LANstep",
[0xFF] = "Xenix bad blocks table",
};
static const char *
get_type(int t)
{
const char *ret;
ret = (t >= 0 && t <= 255) ? part_types[t] : NULL;
return ret ? ret : "unknown";
}
static int geom_class_available(const char *);
static void print_s0(void);
static void print_part(const struct dos_partition *);
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, uint32_t maxval);
static int read_config(char *config_file);
static void reset_boot(void);
static int sanitize_partition(struct dos_partition *);
static void usage(void) __dead2;
int
main(int argc, char *argv[])
{
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 {
disk = g_device_path(argv[0]);
if (disk == NULL)
err(1, "unable to get correct path for %s", 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 = &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 = &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 = &mboot.parts[0];
partp->dp_typ = DOSPTYP_386BSD;
partp->dp_flag = ACTIVE;
partp->dp_start = dos_sectors;
partp->dp_size = rounddown(disksecs, dos_cylsecs) -
dos_sectors;
dos(partp);
if (v_flag)
print_s0();
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();
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();
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(void)
{
fprintf(stderr, "%s%s",
"usage: fdisk [-BIaipqstu] [-b bootcode] [-1234] [disk]\n",
" fdisk -f configfile [-itv] [disk]\n");
exit(1);
}
static void
print_s0(void)
{
int i;
print_params();
printf("Information from DOS bootblock is:\n");
for (i = 1; i <= NDOSPART; i++) {
printf("%d: ", i);
print_part(&mboot.parts[i - 1]);
}
}
static struct dos_partition mtpart;
static void
print_part(const struct dos_partition *partp)
{
u_int64_t part_mb;
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)
{
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 (sb.st_size == 0)
errx(1, "%s is empty, must not be.", 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);
}
static void
init_sector0(unsigned long start)
{
struct dos_partition *partp = &mboot.parts[0];
init_boot();
partp->dp_typ = DOSPTYP_386BSD;
partp->dp_flag = ACTIVE;
start = roundup(start, dos_sectors);
if(start == 0)
start = dos_sectors;
partp->dp_start = start;
partp->dp_size = rounddown(disksecs, dos_cylsecs) - start;
dos(partp);
}
static void
change_part(int i)
{
struct dos_partition *partp = &mboot.parts[i - 1];
printf("The data for partition %d is:\n", i);
print_part(partp);
if (u_flag && ok("Do you want to change it?")) {
int tmp;
if (i_flag) {
bzero(partp, sizeof (*partp));
if (i == 1) {
init_sector0(1);
printf("\nThe static data for the slice 1 has been reinitialized to:\n");
print_part(partp);
}
}
do {
Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp, 255);
Decimal("start", partp->dp_start, tmp, NO_DISK_SECTORS);
Decimal("size", partp->dp_size, tmp, NO_DISK_SECTORS);
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, NO_TRACK_CYLINDERS);
Decimal("beginning head", thd, tmp, NO_TRACK_HEADS);
Decimal("beginning sector", tsec, tmp, NO_TRACK_SECTORS);
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, NO_TRACK_CYLINDERS);
Decimal("ending head", thd, tmp, NO_TRACK_HEADS);
Decimal("ending sector", tsec, tmp, NO_TRACK_SECTORS);
partp->dp_ecyl = DOSCYL(tcyl);
partp->dp_esect = DOSSECT(tsec,tcyl);
partp->dp_ehd = thd;
} else
dos(partp);
print_part(partp);
} while (!ok("Are we happy with this entry?"));
}
}
static void
print_params(void)
{
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, 0);
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(void)
{
if (ok("Do you want to change the boot code?"))
init_boot();
}
void
get_params_to_use(void)
{
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, 0);
Decimal("BIOS's idea of #heads", dos_heads, tmp, 0);
Decimal("BIOS's idea of #sectors", dos_sectors, tmp, 0);
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)
{
int rwmode;
/* Write mode if one of these flags are set. */
rwmode = (a_flag || I_flag || B_flag || flag);
fd = g_open(disk, rwmode);
/* If the mode fails, try read-only if we didn't. */
if (fd == -1 && errno == EPERM && rwmode)
fd = g_open(disk, 0);
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
geom_class_available(const char *name)
{
struct gclass *class;
struct gmesh mesh;
int error;
error = geom_gettree(&mesh);
if (error != 0)
errc(1, error, "Cannot get GEOM tree");
LIST_FOREACH(class, &mesh.lg_class, lg_class) {
if (strcmp(class->lg_name, name) == 0) {
geom_deletetree(&mesh);
return (1);
}
}
geom_deletetree(&mesh);
return (0);
}
static int
write_disk(off_t sector, void *buf)
{
ssize_t wr;
/*
* Try to write MBR directly. This may help when disk
* is not in use.
* XXX: hardcoded sectorsize
*/
wr = pwrite(fd, buf, secsize, (sector * 512));
if (wr == secsize)
return (0);
if (geom_class_available("PART") != 0)
warnx("Failed to write MBR. Try to use gpart(8).");
else
warnx("Failed to write sector zero");
return(EINVAL);
}
static int
get_params(void)
{
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;
u = g_sectorsize(fd);
if (u <= 0)
return (-1);
o = g_mediasize(fd);
if (o < 0)
return (-1);
if (o / u <= NO_DISK_SECTORS)
disksecs = o / u;
else
disksecs = NO_DISK_SECTORS;
cyls = dos_cyls = o / (u * dos_heads * dos_sectors);
return (0);
}
static int
read_s0(void)
{
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(void)
{
int sector, i;
if (iotest) {
print_s0();
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, uint32_t maxval)
{
long long acc;
int c;
char *cp;
while (1) {
acc = 0;
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') {
if (acc <= maxval || maxval == 0)
acc = acc * 10 + c - '0';
} else
break;
}
if (c == ' ' || c == '\t')
while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
if (!c) {
if (maxval > 0 && acc > maxval) {
acc = maxval;
printf("%s exceeds maximum value allowed for "
"this field. The value has been reduced "
"to %lld\n", lbuf, acc);
}
*num = acc;
return 1;
} else
printf("%s is an invalid decimal number. Try again.\n",
lbuf);
}
}
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 == '\0')
break; /* eol */
if (*cp == '#')
break; /* found comment */
if (isalpha(*cp))
command->args[command->n_args].argtype = *cp++;
end = NULL;
command->args[command->n_args].arg_val = strtoul(cp, &end, 0);
if (cp == end || (!isspace(*end) && *end != '\0')) {
char ch;
end = cp;
while (!isspace(*end) && *end != '\0') ++end;
ch = *end; *end = '\0';
command->args[command->n_args].arg_str = strdup(cp);
*end = ch;
} else
command->args[command->n_args].arg_str = NULL;
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 u_int32_t
str2sectors(const char *str)
{
char *end;
unsigned long val;
val = strtoul(str, &end, 0);
if (str == end || *end == '\0') {
warnx("ERROR line %d: unexpected size: \'%s\'",
current_line_number, str);
return NO_DISK_SECTORS;
}
if (*end == 'K')
val *= 1024UL / secsize;
else if (*end == 'M')
val *= 1024UL * 1024UL / secsize;
else if (*end == 'G')
val *= 1024UL * 1024UL * 1024UL / secsize;
else {
warnx("ERROR line %d: unexpected modifier: %c "
"(not K/M/G)", current_line_number, *end);
return NO_DISK_SECTORS;
}
return val;
}
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 = &mboot.parts[partition - 1];
bzero(partp, sizeof (*partp));
partp->dp_typ = command->args[1].arg_val;
if (command->args[2].arg_str != NULL) {
if (strcmp(command->args[2].arg_str, "*") == 0) {
int i;
partp->dp_start = dos_sectors;
for (i = 1; i < partition; i++) {
struct dos_partition *prev_partp;
prev_partp = ((struct dos_partition *)
&mboot.parts) + i - 1;
if (prev_partp->dp_typ != 0)
partp->dp_start = prev_partp->dp_start +
prev_partp->dp_size;
}
if (partp->dp_start % dos_sectors != 0) {
prev_head_boundary = rounddown(partp->dp_start,
dos_sectors);
partp->dp_start = prev_head_boundary +
dos_sectors;
}
} else {
partp->dp_start = str2sectors(command->args[2].arg_str);
if (partp->dp_start == NO_DISK_SECTORS)
break;
}
} else
partp->dp_start = command->args[2].arg_val;
if (command->args[3].arg_str != NULL) {
if (strcmp(command->args[3].arg_str, "*") == 0)
partp->dp_size = rounddown(disksecs, dos_cylsecs) -
partp->dp_start;
else {
partp->dp_size = str2sectors(command->args[3].arg_str);
if (partp->dp_size == NO_DISK_SECTORS)
break;
}
prev_cyl_boundary = rounddown(partp->dp_start + partp->dp_size,
dos_cylsecs);
if (prev_cyl_boundary > partp->dp_start)
partp->dp_size = prev_cyl_boundary - partp->dp_start;
} else
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(partp, sizeof(*partp));
status = 1;
break;
}
/*
* Adjust start upwards, if necessary, to fall on a head boundary.
*/
if (partp->dp_start % dos_sectors != 0) {
prev_head_boundary = rounddown(partp->dp_start, 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 = rounddown(partp->dp_start + partp->dp_size,
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 = 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 = &mboot.parts[i];
bzero(partp, sizeof(*partp));
}
}
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 = rounddown(start, 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 = rounddown(start + size, 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
* A ".eli" part is removed if it exists (see geli(8)).
* A ".journal" ending is removed if it exists (see gjournal(8)).
*/
static char *
get_rootdisk(void)
{
struct statfs rootfs;
regex_t re;
#define NMATCHES 2
regmatch_t rm[NMATCHES];
char dev[PATH_MAX], *s;
int rv;
if (statfs("/", &rootfs) == -1)
err(1, "statfs(\"/\")");
if ((rv = regcomp(&re, "^(/dev/[a-z/]+[0-9]*)([sp][0-9]+)?[a-h]?(\\.journal)?$",
REG_EXTENDED)) != 0)
errx(1, "regcomp() failed (%d)", rv);
strlcpy(dev, rootfs.f_mntfromname, sizeof (dev));
if ((s = strstr(dev, ".eli")) != NULL)
memmove(s, s+4, strlen(s + 4) + 1);
if ((rv = regexec(&re, dev, 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;
}
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