#include <sys/param.h>
#include <sys/diskslice.h>
#include <sys/diskmbr.h>
#include <sys/stat.h>
#include <ctype.h>
#include <fcntl.h>
#include <err.h>
#include <fstab.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <bus/cam/scsi/scsi_daio.h>
#define Decimal(str, ans, tmp) \
if (decimal(str, &tmp, ans)) ans = tmp
#define MAX_SEC_SIZE 4096
#define MIN_SEC_SIZE 512
#define MAX_SECTORS_PER_TRACK 0x3f
#define MIN_SECTORS_PER_TRACK 0x1
#define MAX_HEADS 0xff
#define ACTIVE 0x80
#define DOSSECT(s,c) ((s & MAX_SECTORS_PER_TRACK) | ((c >> 2) & 0xc0))
#define DOSCYL(c) (c & 0xff)
#define MAXCYL 1023
static const char *disk = NULL;
static const char *disks[] = {
"/dev/da0", "/dev/ad0", "/dev/vkd0", "/dev/vbd0", NULL,
};
struct mboot {
unsigned char padding[2];
unsigned char *bootinst;
off_t bootinst_size;
struct dos_partition parts[NDOSPART];
};
static struct mboot mboot;
static int fd;
static int secsize = 0;
static int partition = -1;
static int current_line_number;
static int geom_processed = 0;
static int part_processed = 0;
static int active_processed = 0;
static int dos_cyls, dos_heads, dos_sectors, dos_cylsecs;
static int cyls, sectors, heads, cylsecs;
static int64_t disksecs;
#define LBUF 100
static char lbuf[LBUF];
#define MAX_ARGS 10
typedef struct cmd {
char cmd;
int n_args;
struct arg {
char argtype;
long long arg_val;
} args[MAX_ARGS];
} CMD;
static int B_flag = 0;
static int C_flag = 0;
static int E_flag = 0;
static int I_flag = 0;
static int a_flag = 0;
static char *b_flag = NULL;
static char *f_flag = NULL;
static int i_flag = 0;
static int u_flag = 0;
static int p_flag = 0;
static int s_flag = 0;
static int t_flag = 0;
static int v_flag = 0;
static int x_flag = 0;
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 void dos(struct dos_partition *partp);
static int open_disk(void);
static void erase_partition(int i);
static ssize_t read_disk(off_t sector, void *buf);
static ssize_t 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);
static int expand_table(void);
int
main(int argc, char *argv[])
{
int c, i;
while ((c = getopt(argc, argv, "BCEIab:f:ip:stuvx1234")) != -1) {
switch (c) {
case 'B':
B_flag = 1;
break;
case 'C':
C_flag = 1;
break;
case 'E':
E_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':
disk = optarg;
p_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 'x':
++x_flag;
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 = getdevpath(argv[0], 0);
if (disk == NULL)
err(1, "cannot get the path of device %s", argv[0]);
if (open_disk() < 0)
err(1, "cannot open disk %s", disk);
} else if (disk == NULL) {
int rv = 0;
for (i = 0; disks[i]; i++) {
disk = disks[i];
rv = open_disk();
if (rv != -2)
break;
}
if (rv < 0)
err(1, "cannot open any disk");
} else {
if (open_disk() < 0)
err(1, "cannot open disk %s", disk);
}
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) {
free(mboot.bootinst);
errx(1, "could not read MBR");
}
free(mboot.bootinst);
mboot.bootinst = NULL;
if (s_flag) {
struct dos_partition *partp;
printf("%s: %d cyl %d hd %d sec\n",
disk, dos_cyls, dos_heads, dos_sectors);
if (read_s0()) {
if (errno != 0)
err(1, "read_s0");
else
exit(1);
}
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) {
struct dos_partition *partp;
read_s0();
reset_boot();
partp = (struct dos_partition *) (&mboot.parts[0]);
partp->dp_typ = DOSPTYP_DFLYBSD;
partp->dp_flag = ACTIVE;
partp->dp_start = dos_sectors;
if (disksecs - dos_sectors > 0xFFFFFFFFU) {
printf("Warning: Ending logical block > 2TB, "
"using max value\n");
partp->dp_size = 0xFFFFFFFFU;
} else {
partp->dp_size =
rounddown(disksecs, dos_cylsecs) - dos_sectors;
}
dos(partp);
if (v_flag)
print_s0(-1);
if (E_flag) {
erase_partition(0);
}
if (!t_flag) {
if (write_s0() == -1)
err(1, "can't write fdisk partition table");
}
exit(0);
}
if (f_flag) {
if (read_s0() || i_flag)
reset_boot();
if (!read_config(f_flag))
exit(1);
if (x_flag)
x_flag = expand_table();
if (v_flag)
print_s0(-1);
if (!t_flag) {
if (write_s0() == -1)
err(1, "can't write fdisk partition table");
}
exit(0);
}
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 (x_flag)
x_flag = expand_table();
if (x_flag || u_flag || a_flag || B_flag) {
if (!t_flag) {
printf("\nWe haven't changed the "
"partition table yet. "
"This is your last chance.\n");
}
print_s0(-1);
if (!t_flag) {
if (ok("Should we write new partition table?")) {
if (E_flag && u_flag) {
if (partition == -1) {
for (i = 0; i < NDOSPART; i++)
erase_partition(i);
} else {
erase_partition(partition);
}
}
if (write_s0() == -1)
err(1, "can't write fdisk partition "
"table");
}
} else {
printf("\n-t flag specified -- "
"partition table not written.\n");
}
}
exit(0);
}
static void
usage(void)
{
fprintf(stderr, "%s%s%s",
"usage: fdisk [-BCEIaistu] [-b bootcode] [-p diskimage]\n",
" [-1234] [disk]\n",
" fdisk -f configfile [-itv] [disk]\n");
exit(1);
}
static int
expand_table(void)
{
struct dos_partition *part;
struct dos_partition *best;
int i;
printf("\n");
best = NULL;
for (i = 0; i < NDOSPART; ++i) {
part = ((struct dos_partition *) &mboot.parts) + i;
if (part->dp_start == 0 && part->dp_size == 0)
continue;
if (best == NULL || best->dp_start < part->dp_start)
best = part;
}
if (best) {
if (best->dp_typ == 0xEE || best->dp_typ == 0xEF) {
printf("Cannot use fdisk to resize a GPT label\n");
printf("use 'gpt expand <device>' instead\n");
best = NULL;
return 0;
}
if (disksecs - best->dp_start > 0xFFFFFFFFU) {
if (best->dp_size == 0xFFFFFFFFU) {
printf("Last slice already using max value, "
"no changes required\n");
best = NULL;
}
} else if (best->dp_size == rounddown(disksecs, dos_cylsecs) -
best->dp_start) {
printf("Last slice already properly sized, "
"no changes required\n");
best = NULL;
}
}
if (best) {
printf("Changing size of last slice %u -> ", best->dp_start);
if (disksecs - best->dp_start > 0xFFFFFFFFU) {
printf("max-value\n");
best->dp_size = 0xFFFFFFFFU;
} else {
best->dp_size = rounddown(disksecs, dos_cylsecs) -
best->dp_start;
printf("%u\n", best->dp_size);
}
dos(best);
return 1;
}
return 0;
}
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 = { 0 };
static void
print_part(int i)
{
struct dos_partition *partp;
uint64_t part_mb;
partp = ((struct dos_partition *) &mboot.parts) + i - 1;
if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) {
printf("<UNUSED>\n");
return;
}
part_mb = ((uint64_t)partp->dp_size * secsize) >> 20;
printf("sysid %d,(%s)\n", partp->dp_typ, get_type(partp->dp_typ));
printf(" start %lu, size %lu (%ju MB), 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 boot_fd, n;
struct stat sb;
fname = b_flag ? b_flag : "/boot/mbr";
if ((boot_fd = open(fname, O_RDONLY)) == -1 ||
fstat(boot_fd, &sb) == -1)
err(1, "%s", fname);
mboot.bootinst_size = sb.st_size;
if (mboot.bootinst_size % secsize != 0) {
close(boot_fd);
errx(1, "%s: length must be a multiple of sector size", fname);
}
free(mboot.bootinst);
if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) {
close(boot_fd);
errx(1, "%s: unable to allocate read buffer", fname);
}
n = read(boot_fd, mboot.bootinst, mboot.bootinst_size);
close(boot_fd);
if (n == -1)
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;
init_boot();
partp = (struct dos_partition *)(&mboot.parts[3]);
partp->dp_typ = DOSPTYP_DFLYBSD;
partp->dp_flag = ACTIVE;
start = roundup(start, dos_sectors);
if (start == 0)
start = dos_sectors;
partp->dp_start = start;
if (disksecs - start > 0xFFFFFFFFU) {
printf("Warning: Ending logical block > 2TB, "
"using max value\n");
partp->dp_size = 0xFFFFFFFFU;
} else {
partp->dp_size = rounddown(disksecs, dos_cylsecs) - start;
}
dos(partp);
}
static void
change_part(int i)
{
struct dos_partition *partp;
int tmp, tsec, tcyl, thd;
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?"))
return;
if (i_flag) {
bzero((char *)partp, sizeof (struct dos_partition));
if (i == 4) {
init_sector0(1);
printf("\nThe static data for the DOS partition 4 "
"has been reinitialized to:\n");
print_part(i);
}
}
do {
Decimal("sysid (108=DragonFly)", 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 ?")) {
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);
if (tcyl > MAXCYL && C_flag == 0) {
printf("Warning: starting cylinder wraps, "
"using all 1's\n");
partp->dp_scyl = -1;
partp->dp_ssect = -1;
partp->dp_shd = -1;
} else {
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);
if (tcyl > MAXCYL && C_flag == 0) {
printf("Warning: ending cylinder wraps, "
"using all 1's\n");
partp->dp_ecyl = -1;
partp->dp_esect = -1;
partp->dp_ehd = -1;
} else {
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(void)
{
printf("parameters extracted from device are:\n");
printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n",
cyls, heads, sectors, cylsecs);
if (dos_sectors > MAX_SECTORS_PER_TRACK ||
dos_cyls > MAXCYL || dos_heads > MAX_HEADS)
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 > NDOSPART) {
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();
}
static 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);
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"));
}
}
static void
dos(struct dos_partition *partp)
{
int cy, sec;
uint32_t end;
if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) {
memcpy(partp, &mtpart, sizeof(*partp));
return;
}
cy = partp->dp_start / dos_cylsecs;
sec = partp->dp_start % dos_sectors + 1;
if (cy > MAXCYL && C_flag == 0) {
printf("Warning: starting cylinder wraps, using all 1's\n");
partp->dp_shd = -1;
partp->dp_scyl = -1;
partp->dp_ssect = -1;
} else {
partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors;
partp->dp_scyl = DOSCYL(cy);
partp->dp_ssect = DOSSECT(sec, cy);
}
end = partp->dp_start + partp->dp_size - 1;
cy = end / dos_cylsecs;
sec = end % dos_sectors + 1;
if (cy > MAXCYL && C_flag == 0) {
printf("Warning: ending cylinder wraps, using all 1's\n");
partp->dp_ehd = -1;
partp->dp_ecyl = -1;
partp->dp_esect = -1;
} else {
partp->dp_ehd = end % dos_cylsecs / dos_sectors;
partp->dp_ecyl = DOSCYL(cy);
partp->dp_esect = DOSSECT(sec, cy);
}
}
static void
erase_partition(int i)
{
struct dos_partition *partp;
off_t ioarg[2];
partp = ((struct dos_partition *) &mboot.parts) + i;
printf("Erase sectors: start=%u size=%u\n",
partp->dp_start, partp->dp_size);
ioarg[0] = partp->dp_start * secsize;
ioarg[1] = partp->dp_size * secsize;
if (ioctl(fd, DAIOCTRIM, ioarg) < 0) {
printf("Trim error %s\n", strerror(errno));
printf("Continuing\n");
} else {
printf("Trim completed ok\n");
}
}
static int
open_disk(void)
{
struct stat st;
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) && p_flag == 0)
warnx("device %s is not character special", disk);
fd = open(disk, (x_flag || a_flag || I_flag || B_flag || u_flag) ?
O_RDWR : O_RDONLY);
if (fd == -1) {
if (errno == ENXIO)
return -2;
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)
{
int size;
lseek(fd, sector * 512, 0);
if (secsize == 0) {
for (secsize = MIN_SEC_SIZE;
secsize <= MAX_SEC_SIZE;
secsize *= 2)
{
errno = 0;
size = read(fd, buf, secsize);
if (size == secsize)
return secsize;
}
} else {
size = read(fd, buf, secsize);
if (size == secsize)
return secsize;
}
warn("failed to read sector %ju", (uintmax_t)sector);
return -1;
}
static ssize_t
write_disk(off_t sector, void *buf)
{
lseek(fd, sector * 512, 0);
return write(fd, buf, secsize);
}
static int
get_params(void)
{
struct partinfo partinfo;
struct stat st;
if (ioctl(fd, DIOCGPART, &partinfo) == -1) {
if (p_flag && fstat(fd, &st) == 0 && st.st_size) {
sectors = MAX_SECTORS_PER_TRACK;
heads = MAX_HEADS;
cylsecs = heads * sectors;
cyls = st.st_size / 512 / cylsecs;
} else {
warnx("can't get disk parameters on %s; "
"supplying dummy ones", disk);
heads = 1;
cylsecs = heads * sectors;
}
} else {
heads = partinfo.d_nheads;
sectors = partinfo.d_secpertrack;
cylsecs = heads * sectors;
secsize = partinfo.media_blksize;
cyls = partinfo.media_blocks / (heads * sectors);
if ((u_int)cyls != partinfo.d_ncylinders) {
printf("Warning: disk %s provided wrong ncylinders %u; "
"recalculating to %d\n",
disk, partinfo.d_ncylinders, cyls);
}
}
dos_cyls = cyls;
dos_heads = heads;
dos_sectors = sectors;
dos_cylsecs = cylsecs;
disksecs = (int64_t)cyls * heads * sectors;
return (0);
}
static int
read_s0(void)
{
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 (*(uint16_t *)&mboot.bootinst[DOSMAGICOFF] != DOSMAGIC) {
if (!(i_flag || I_flag))
warnx("invalid fdisk partition table found");
return -1;
}
memcpy(mboot.parts, &mboot.bootinst[DOSPARTOFF], sizeof(mboot.parts));
return 0;
}
static int
write_s0(void)
{
#ifdef NOT_NOW
int flag = 1;
#endif
int sector;
memcpy(&mboot.bootinst[DOSPARTOFF], mboot.parts, sizeof(mboot.parts));
#ifdef NOT_NOW
if (ioctl(fd, DIOCWLABEL, &flag) < 0)
warn("ioctl DIOCWLABEL");
#endif
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");
#ifdef NOT_NOW
flag = 0;
ioctl(fd, DIOCWLABEL, &flag);
#endif
return -1;
}
#ifdef NOT_NOW
flag = 0;
ioctl(fd, DIOCWLABEL, &flag);
#endif
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 (strcmp(lbuf, "yes") == 0 || strcmp(lbuf, "YES") == 0 ||
strcmp(lbuf, "y") == 0 || strcmp(lbuf, "Y") == 0)
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 = NELEM(dos_ptypes);
int counter = 0;
const struct dos_ptype *ptr = dos_ptypes;
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++;
while (1) {
while (isspace(*cp))
++cp;
if (*cp == '#')
break;
if (isalpha(*cp))
command->args[command->n_args].argtype = *cp++;
if (!isdigit(*cp))
break;
end = NULL;
command->args[command->n_args].arg_val =
strtoll(cp, &end, 0);
if (cp == end)
break;
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 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 = -1;
dos_heads = -1;
dos_sectors = -1;
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;
if (dos_cyls < 0) {
warnx("ERROR line %d: number of cylinders "
"not specified", current_line_number);
status = 0;
}
if (dos_cyls == 0 || 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 "
"is dedicated to DragonFly)",
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 < 1 || 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 < MIN_SECTORS_PER_TRACK ||
dos_sectors > MAX_SECTORS_PER_TRACK) {
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, part;
uint32_t prev_head_boundary, prev_cyl_boundary;
uint32_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;
}
part = command->args[0].arg_val;
if (part < 1 || part > NDOSPART) {
warnx("ERROR line %d: invalid partition number %d",
current_line_number, part);
break;
}
partp = ((struct dos_partition *) &mboot.parts) + part - 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) {
bzero((char *)partp, sizeof (struct dos_partition));
status = 1;
break;
}
if (partp->dp_start % dos_sectors != 0) {
prev_head_boundary =
rounddown(partp->dp_start, dos_sectors);
if (max_end < (uint32_t)dos_sectors ||
prev_head_boundary > max_end - dos_sectors) {
warnx("ERROR line %d: unable to adjust start "
"of partition %d to fall on "
"a head boundary",
current_line_number, part);
break;
}
warnx("WARNING: adjusting start offset of "
"partition %d from %u to %u, "
"to fall on a head boundary",
part, (u_int)partp->dp_start,
(u_int)(prev_head_boundary + dos_sectors));
partp->dp_start = prev_head_boundary + dos_sectors;
}
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 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 to end on a cylinder boundary",
part, (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, part);
break;
}
dos(partp);
status = 1;
break;
}
return (status);
}
static int
process_active(CMD *command)
{
int status = 0, part, 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;
}
part = command->args[0].arg_val;
if (part < 1 || part > NDOSPART) {
warnx("ERROR line %d: invalid partition number %d",
current_line_number, part);
break;
}
partp = ((struct dos_partition *) &mboot.parts);
for (i = 0; i < NDOSPART; i++)
partp[i].dp_flag = 0;
partp[part-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:
break;
case 'g':
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) {
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) {
fclose(fp);
}
return (status);
}
static void
reset_boot(void)
{
int i;
struct dos_partition *partp;
init_boot();
for (i = 0; i < NDOSPART; ++i) {
partp = ((struct dos_partition *) &mboot.parts) + i;
bzero((char *)partp, sizeof(struct dos_partition));
}
}
static int
sanitize_partition(struct dos_partition *partp)
{
uint32_t prev_head_boundary, prev_cyl_boundary;
uint32_t max_end, size, start;
start = partp->dp_start;
size = partp->dp_size;
max_end = start + size;
if (size == 0) {
if (start == 0 && partp->dp_typ == 0)
return (1);
warnx("ERROR: size of partition is zero");
return (0);
}
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);
if (start % dos_sectors != 0) {
prev_head_boundary = rounddown(start, dos_sectors);
if (max_end < (uint32_t)dos_sectors ||
prev_head_boundary >= max_end - dos_sectors) {
warnx("ERROR: unable to adjust start of partition "
"to fall on a head boundary");
return (0);
}
start = prev_head_boundary + dos_sectors;
}
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 and end on a cylinder boundary.");
return (0);
}
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);
}
