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d2f46c9060
freebsd/sbin/sunlabel/sunlabel.c
Jake Burkholder d2f46c9060 - Use read(2) to get the existing sunlabel on a disk, instead of parsing 
kern.geom.conftxt, which md disks don't show up in.  If the magic and
  the checksum are right assume its a valid sunlabel, otherwise use the
  DIOC ioctls to get the disk parameters and whip up a label out of thin
  air.
- Don't just silently create or correct invalid c partitions, warn about
  invalid ones in label proto files.
- Split checksumming into a function since we do it a couple times.  Also
  don't include the sl_cksum field in the checksum, which avoids needing
  to clear it first.

This is makes sunlabel a suitable replacement for disklabel in make release.
2003-04-15 23:46:19 +00:00

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/*-
* Copyright (c) 2003 Jake Burkholder.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Copyright (c) 1994, 1995 Gordon W. Ross
* Copyright (c) 1994 Theo de Raadt
* All rights reserved.
* Copyright (c) 1987, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Symmetric Computer Systems.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* This product includes software developed by Theo de Raadt.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: $NetBSD: disksubr.c,v 1.13 2000/12/17 22:39:18 pk $
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/param.h>
#include <sys/disk.h>
#include <sys/ioctl.h>
#include <sys/sun_disklabel.h>
#include <sys/wait.h>
#include <err.h>
#include <fcntl.h>
#include <inttypes.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define _PATH_TMPFILE "/tmp/EdDk.XXXXXXXXXX"
#define _PATH_BOOT "/boot/boot1"
static int bflag;
static int Bflag;
static int eflag;
static int nflag;
static int rflag = 1;
static int Rflag;
static int wflag;
static int check_label(struct sun_disklabel *sl);
static void read_label(struct sun_disklabel *sl, const char *disk);
static void write_label(struct sun_disklabel *sl, const char *disk,
const char *bootpath);
static int edit_label(struct sun_disklabel *sl, const char *disk,
const char *bootpath);
static int parse_label(struct sun_disklabel *sl, const char *file);
static void print_label(struct sun_disklabel *sl, const char *disk, FILE *out);
static uint16_t checksum(struct sun_disklabel *sl);
static int parse_size(struct sun_disklabel *sl, int part, char *size);
static int parse_offset(struct sun_disklabel *sl, int part, char *offset);
static void usage(void);
extern char *__progname;
/*
* Disk label editor for sun disklabels.
*/
int
main(int ac, char **av)
{
struct sun_disklabel sl;
const char *bootpath;
const char *proto;
const char *disk;
int ch;
bootpath = _PATH_BOOT;
while ((ch = getopt(ac, av, "b:BenrRw")) != -1)
switch (ch) {
case 'b':
bflag = 1;
bootpath = optarg;
break;
case 'B':
Bflag = 1;
break;
case 'e':
eflag = 1;
break;
case 'n':
nflag = 1;
break;
case 'r':
rflag = 1;
break;
case 'R':
Rflag = 1;
break;
case 'w':
wflag = 1;
break;
default:
usage();
break;
}
if (bflag && !Bflag)
usage();
if (nflag && !(Bflag || eflag || Rflag || wflag))
usage();
if (eflag && (Rflag || wflag))
usage();
ac -= optind;
av += optind;
if (ac == 0)
usage();
bzero(&sl, sizeof(sl));
disk = av[0];
if (wflag) {
if (ac != 2 || strcmp(av[1], "auto") != 0)
usage();
read_label(&sl, disk);
bzero(sl.sl_part, sizeof(sl.sl_part));
sl.sl_part[2].sdkp_cyloffset = 0;
sl.sl_part[2].sdkp_nsectors = sl.sl_ncylinders *
sl.sl_ntracks * sl.sl_nsectors;
write_label(&sl, disk, bootpath);
} else if (eflag) {
if (ac != 1)
usage();
read_label(&sl, disk);
if (sl.sl_magic != SUN_DKMAGIC)
errx(1, "%s%s has no sun disklabel", _PATH_DEV, disk);
while (edit_label(&sl, disk, bootpath) != 0)
;
} else if (Rflag) {
if (ac != 2)
usage();
proto = av[1];
read_label(&sl, disk);
if (parse_label(&sl, proto) != 0)
errx(1, "%s: invalid label", proto);
write_label(&sl, disk, bootpath);
} else if (Bflag) {
read_label(&sl, disk);
if (sl.sl_magic != SUN_DKMAGIC)
errx(1, "%s%s has no sun disklabel", _PATH_DEV, disk);
write_label(&sl, disk, bootpath);
} else {
read_label(&sl, disk);
if (sl.sl_magic != SUN_DKMAGIC)
errx(1, "%s%s has no sun disklabel", _PATH_DEV, disk);
print_label(&sl, disk, stdout);
}
return (0);
}
static int
check_label(struct sun_disklabel *sl)
{
uint64_t nsectors;
uint64_t ostart;
uint64_t start;
uint64_t oend;
uint64_t end;
int i;
int j;
nsectors = sl->sl_ncylinders * sl->sl_ntracks * sl->sl_nsectors;
if (sl->sl_part[2].sdkp_cyloffset != 0 ||
sl->sl_part[2].sdkp_nsectors != nsectors) {
warnx("partition c is incorrect, must start at 0 and cover "
"whole disk");
return (1);
}
for (i = 0; i < 8; i++) {
if (i == 2 || sl->sl_part[i].sdkp_nsectors == 0)
continue;
start = (uint64_t)sl->sl_part[i].sdkp_cyloffset *
sl->sl_ntracks * sl->sl_nsectors;
end = start + sl->sl_part[i].sdkp_nsectors;
if (end > nsectors) {
warnx("partition %c extends past end of disk",
'a' + i);
return (1);
}
for (j = 0; j < 8; j++) {
if (j == 2 || j == i ||
sl->sl_part[j].sdkp_nsectors == 0)
continue;
ostart = (uint64_t)sl->sl_part[j].sdkp_cyloffset *
sl->sl_ntracks * sl->sl_nsectors;
oend = ostart + sl->sl_part[j].sdkp_nsectors;
if ((start <= ostart && end >= oend) ||
(start > ostart && start < oend) ||
(end > ostart && end < oend)) {
warnx("partition %c overlaps partition %c",
'a' + i, 'a' + j);
return (1);
}
}
}
return (0);
}
static void
read_label(struct sun_disklabel *sl, const char *disk)
{
char path[MAXPATHLEN];
uint32_t sectorsize;
uint32_t fwsectors;
uint32_t fwheads;
off_t mediasize;
int fd;
snprintf(path, sizeof(path), "%s%s", _PATH_DEV, disk);
if ((fd = open(path, O_RDONLY)) < 0)
err(1, "open %s", path);
if (read(fd, sl, sizeof(*sl)) != sizeof(*sl))
err(1, "read");
if (sl->sl_magic != SUN_DKMAGIC || checksum(sl) != sl->sl_cksum) {
bzero(sl, sizeof(*sl));
if (ioctl(fd, DIOCGMEDIASIZE, &mediasize) != 0)
err(1, "%s: ioctl(DIOCGMEDIASIZE) failed", disk);
if (ioctl(fd, DIOCGSECTORSIZE, &sectorsize) != 0)
err(1, "%s: DIOCGSECTORSIZE failed", disk);
if (ioctl(fd, DIOCGFWSECTORS, &fwsectors) != 0)
fwsectors = 63;
if (ioctl(fd, DIOCGFWHEADS, &fwheads) != 0) {
if (mediasize <= 63 * 1024 * sectorsize)
fwheads = 1;
else if (mediasize <= 63 * 16 * 1024 * sectorsize)
fwheads = 16;
else
fwheads = 255;
}
sl->sl_rpm = 3600;
sl->sl_pcylinders = mediasize / (fwsectors * fwheads *
sectorsize);
sl->sl_sparespercyl = 0;
sl->sl_interleave = 1;
sl->sl_ncylinders = sl->sl_pcylinders - 2;
sl->sl_acylinders = 2;
sl->sl_nsectors = fwsectors;
sl->sl_ntracks = fwheads;
sl->sl_part[2].sdkp_cyloffset = 0;
sl->sl_part[2].sdkp_nsectors = sl->sl_ncylinders *
sl->sl_ntracks * sl->sl_nsectors;
if (mediasize > 4999L * 1024L * 1024L) {
sprintf(sl->sl_text,
"FreeBSD%luG cyl %u alt %u hd %u sec %u",
(mediasize + 512 * 1024 * 1024) /
(1024 * 1024 * 1024),
sl->sl_ncylinders, sl->sl_acylinders,
sl->sl_ntracks, sl->sl_nsectors);
} else {
sprintf(sl->sl_text,
"FreeBSD%luM cyl %u alt %u hd %u sec %u",
(mediasize + 512 * 1024) / (1024 * 1024),
sl->sl_ncylinders, sl->sl_acylinders,
sl->sl_ntracks, sl->sl_nsectors);
}
}
close(fd);
}
static void
write_label(struct sun_disklabel *sl, const char *disk, const char *bootpath)
{
char path[MAXPATHLEN];
char boot[16 * 512];
off_t off;
int bfd;
int fd;
int i;
sl->sl_magic = SUN_DKMAGIC;
sl->sl_cksum = checksum(sl);
if (check_label(sl) != 0)
errx(1, "invalid label");
if (nflag) {
print_label(sl, disk, stdout);
} else if (rflag) {
snprintf(path, sizeof(path), "%s%s", _PATH_DEV, disk);
if ((fd = open(path, O_RDWR)) < 0)
err(1, "open %s", path);
if (Bflag) {
if ((bfd = open(bootpath, O_RDONLY)) < 0)
err(1, "open %s", bootpath);
if (read(bfd, boot, sizeof(boot)) != sizeof(boot))
err(1, "read");
close(bfd);
for (i = 0; i < 8; i++) {
if (sl->sl_part[i].sdkp_nsectors == 0)
continue;
off = sl->sl_part[i].sdkp_cyloffset *
sl->sl_ntracks * sl->sl_nsectors * 512;
if (lseek(fd, off, SEEK_SET) < 0)
err(1, "lseek");
if (write(fd, boot, sizeof(boot)) !=
sizeof(boot))
err(1, "write");
}
}
if (lseek(fd, 0, SEEK_SET) < 0)
err(1, "lseek");
if (write(fd, sl, sizeof(*sl)) != sizeof(*sl))
err(1, "write");
close(fd);
} else
err(1, "implement!");
}
static int
edit_label(struct sun_disklabel *sl, const char *disk, const char *bootpath)
{
char tmpfil[] = _PATH_TMPFILE;
const char *editor;
int status;
FILE *fp;
pid_t pid;
pid_t r;
int fd;
int c;
if ((fd = mkstemp(tmpfil)) < 0)
err(1, "mkstemp");
if ((fp = fdopen(fd, "w")) == NULL)
err(1, "fdopen");
print_label(sl, disk, fp);
fflush(fp);
if ((pid = fork()) < 0)
err(1, "fork");
if (pid == 0) {
if ((editor = getenv("EDITOR")) == NULL)
editor = _PATH_VI;
execlp(editor, editor, tmpfil, NULL);
err(1, "execlp %s", editor);
}
status = 0;
while ((r = wait(&status)) > 0 && r != pid)
;
if (WIFEXITED(status)) {
if (parse_label(sl, tmpfil) == 0) {
fclose(fp);
unlink(tmpfil);
write_label(sl, disk, bootpath);
return (0);
}
printf("re-edit the label? [y]: ");
fflush(stdout);
c = getchar();
if (c != EOF && c != '\n')
while (getchar() != '\n')
;
if (c == 'n') {
fclose(fp);
unlink(tmpfil);
return (0);
}
}
fclose(fp);
unlink(tmpfil);
return (1);
}
static int
parse_label(struct sun_disklabel *sl, const char *file)
{
char offset[32];
char size[32];
char buf[128];
uint8_t part;
FILE *fp;
int line;
line = 0;
if ((fp = fopen(file, "r")) == NULL)
err(1, "fopen");
bzero(sl->sl_part, sizeof(sl->sl_part));
while (fgets(buf, sizeof(buf), fp) != NULL) {
if (buf[0] != ' ' || buf[1] != ' ')
continue;
if (sscanf(buf, " %c: %s %s\n", &part, size, offset) != 3 ||
parse_size(sl, part - 'a', size) ||
parse_offset(sl, part - 'a', offset)) {
warnx("%s: syntex error on line %d",
file, line);
fclose(fp);
return (1);
}
line++;
}
fclose(fp);
return (check_label(sl));
}
static int
parse_size(struct sun_disklabel *sl, int part, char *size)
{
uintmax_t nsectors;
uintmax_t total;
uintmax_t n;
char *p;
int i;
nsectors = 0;
n = strtoumax(size, &p, 10);
if (*p != '\0') {
if (strcmp(size, "*") == 0) {
total = sl->sl_ncylinders * sl->sl_ntracks *
sl->sl_nsectors;
for (i = 0; i < part; i++) {
if (i == 2)
continue;
nsectors += sl->sl_part[i].sdkp_nsectors;
}
n = total - nsectors;
} else if (p[1] == '\0' && (p[0] == 'K' || p[0] == 'k')) {
n = roundup((n * 1024) / 512,
sl->sl_ntracks * sl->sl_nsectors);
} else if (p[1] == '\0' && (p[0] == 'M' || p[0] == 'm')) {
n = roundup((n * 1024 * 1024) / 512,
sl->sl_ntracks * sl->sl_nsectors);
} else if (p[1] == '\0' && (p[0] == 'G' || p[0] == 'g')) {
n = roundup((n * 1024 * 1024 * 1024) / 512,
sl->sl_ntracks * sl->sl_nsectors);
} else
return (-1);
}
sl->sl_part[part].sdkp_nsectors = n;
return (0);
}
static uint16_t
checksum(struct sun_disklabel *sl)
{
uint16_t cksum;
uint16_t *sp1;
uint16_t *sp2;
sp1 = (u_short *)sl;
sp2 = (u_short *)(sl + 1) - 1;
cksum = 0;
while (sp1 < sp2)
cksum ^= *sp1++;
return (cksum);
}
static int
parse_offset(struct sun_disklabel *sl, int part, char *offset)
{
uintmax_t nsectors;
uintmax_t n;
char *p;
int i;
nsectors = 0;
n = strtoumax(offset, &p, 10);
if (*p != '\0') {
if (strcmp(offset, "*") == 0) {
for (i = 0; i < part; i++) {
if (i == 2)
continue;
nsectors += sl->sl_part[i].sdkp_nsectors;
}
n = nsectors / (sl->sl_nsectors * sl->sl_ntracks);
} else
return (-1);
}
sl->sl_part[part].sdkp_cyloffset = n;
return (0);
}
static void
print_label(struct sun_disklabel *sl, const char *disk, FILE *out)
{
int i;
fprintf(out,
"# /dev/%s:\n"
"text: %s\n"
"bytes/sectors: 512\n"
"sectors/cylinder: %d\n"
"sectors/unit: %d\n"
"\n"
"8 partitions:\n"
"#\n"
"# Size is in sectors, use %%dK, %%dM or %%dG to specify in kilobytes,\n"
"# megabytes or gigabytes respectively, or '*' to specify rest of disk.\n"
"# Offset is in cylinders, use '*' to calculate offsets automatically.\n"
"#\n"
"# size offset\n"
"# ---------- ----------\n",
disk,
sl->sl_text,
sl->sl_nsectors * sl->sl_ntracks,
sl->sl_nsectors * sl->sl_ntracks * sl->sl_ncylinders);
for (i = 0; i < 8; i++) {
if (sl->sl_part[i].sdkp_nsectors == 0)
continue;
fprintf(out, " %c: %10u %10u\n",
'a' + i,
sl->sl_part[i].sdkp_nsectors,
sl->sl_part[i].sdkp_cyloffset);
}
}
static void
usage(void)
{
fprintf(stderr, "usage:"
"\t%s [-r] disk\n"
"\t\t(to read label)\n"
"\t%s -B [-b boot1] [-n] disk\n"
"\t\t(to install boot program only)\n"
"\t%s -R [-B [-b boot1]] [-r] [-n] disk protofile\n"
"\t\t(to restore label)\n"
"\t%s -e [-B [-b boot1]] [-r] [-n] disk\n"
"\t\t(to edit label)\n"
"\t%s -w [-B [-b boot1]] [-r] [-n] disk type\n"
"\t\t(to write default label)\n",
__progname,
__progname,
__progname,
__progname,
__progname);
exit(1);
}
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