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/*
* Disk Volume Header Library
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <netinet/in.h>
#include "dvhlib.h"
#include "dvh.h"
#define blksize 512
#ifdef DEBUG
# define dprintf(x...) fprintf(stderr, x)
#else
# define dprintf(x...) do { } while(0)
#endif
void __attribute__((noreturn))
die(const char *message)
{
if (errno)
fprintf(stderr, "%s: %s\n", message, strerror(errno));
else
fprintf(stderr, "%s\n", message);
exit(EXIT_FAILURE);
}
static const char *
ptype2str(int ptype)
{
switch (ptype) {
case PTYPE_VOLHDR: return "Volume Header";
case PTYPE_TRKREPL: return "Bad Track Replacement";
case PTYPE_SECREPL: return "Bad Sector Replacement";
case PTYPE_RAW: return "Data";
case PTYPE_BSD: return "BSD filesystem";
case PTYPE_SYSV: return "SysV filesystem";
case PTYPE_VOLUME: return "Volume";
case PTYPE_EFS: return "EFS";
case PTYPE_LVOL: return "Logical Volume";
case PTYPE_RLVOL: return "Raw Logical Volume";
case PTYPE_XFS: return "XFS";
case PTYPE_XFSLOG: return "XFS Log";
case PTYPE_XLV: return "XLV Volume";
case PTYPE_XVM: return "XVM Volume";
case PTYPE_LSWAP: return "Linux Swap";
case PTYPE_LINUX: return "Linux Native";
}
return "Unknown Partition Type";
}
void
dvh_print_vh(const struct dvh_handle *dvh)
{
const struct volume_header *vh = &dvh->dvh_vh;
printf("----- bootinfo -----\n");
printf("Root partition: %d\n", vh->vh_rootpt);
printf("Swap partition: %d\n", vh->vh_swappt);
printf("Bootfile: \"%s\"\n", vh->vh_bootfile);
}
void
dvh_print_vd(const struct dvh_handle *dvh)
{
const struct volume_header *vh = &dvh->dvh_vh;
char name[VDNAMESIZE+1];
int i;
memset(name, 0, VDNAMESIZE+1);
printf("----- directory entries -----\n");
for (i = 0; i < NVDIR; i++) {
const struct volume_directory *vd;
vd = &vh->vh_vd[i];
if (vd->vd_name[0] == '\0')
continue;
strncpy(name, vd->vd_name, VDNAMESIZE);
printf("Entry #%d, name \"%s\", start %d, bytes %d\n",
i, name, vd->vd_lbn, vd->vd_nbytes);
}
}
void
dvh_print_pt(const struct dvh_handle *dvh)
{
const struct volume_header *vh = &dvh->dvh_vh;
int i;
printf("----- partitions -----\n");
for (i = 0; i < NPARTAB; i++) {
int32_t start, size, type;
start = vh->vh_pt[i].pt_firstlbn;
size = vh->vh_pt[i].pt_nblks;
type = vh->vh_pt[i].pt_type;
if (size == 0) continue;
printf("Part# %2d, start %d, blks %d, type %s\n",
i, start, size, ptype2str(type));
}
}
#define swap_short(s) swap_short_f(&(s));
static void swap_short_f(short *sp)
{
*sp = ntohs(*sp);
}
#define swap_int(i) swap_int_f(&(i));
static void swap_int_f(int *ip)
{
*ip = ntohl(*ip);
}
static uint32_t
twos_complement_32bit_sum(uint32_t *base, int size)
{
int i;
uint32_t sum = 0;
size = size / sizeof(uint32_t);
for (i = 0; i < size; i++)
sum = sum - ntohl(base[i]);
return sum;
}
static int
verify_vh(const struct dvh_handle *dvh)
{
uint32_t csum;
if (ntohl(dvh->dvh_vh.vh_magic) != VHMAGIC) {
fprintf(stderr, "Bad magic\n");
return -1;
}
csum = twos_complement_32bit_sum((uint32_t *)&dvh->dvh_vh,
sizeof(struct volume_header));
return csum != 0;
}
static void
recalc_vh_csum(struct dvh_handle *dvh)
{
dvh->dvh_vh.vh_csum = 0;
dvh->dvh_vh.vh_csum = htonl(twos_complement_32bit_sum(
(uint32_t *)&dvh->dvh_vh, sizeof(struct volume_header)));
}
static void
dvh_swap_device_parameters(struct device_parameters *dp)
{
swap_short(dp->dp_cyls);
swap_short(dp->dp_shd0);
swap_short(dp->dp_trks0);
swap_short(dp->dp_secs);
swap_short(dp->dp_secbytes);
swap_short(dp->dp_interleave);
swap_int(dp->dp_flags);
swap_int(dp->dp_datarate);
swap_int(dp->dp_nretries);
swap_int(dp->dp_mspw);
swap_short(dp->dp_xgap1);
swap_short(dp->dp_xsync);
swap_short(dp->dp_xrdly);
swap_short(dp->dp_xgap2);
swap_short(dp->dp_xrgate);
swap_short(dp->dp_xwcont);
}
static void
dvh_swap_volume_directory(struct volume_directory *vd)
{
swap_int(vd->vd_lbn);
swap_int(vd->vd_nbytes);
}
static void
dvh_swap_partition_table(struct partition_table *pt)
{
swap_int(pt->pt_nblks);
swap_int(pt->pt_firstlbn);
swap_int(pt->pt_type);
}
static void
dvh_swap_volume_header(struct volume_header *vh)
{
int i;
swap_int(vh->vh_magic);
swap_short(vh->vh_rootpt);
swap_short(vh->vh_swappt);
dvh_swap_device_parameters(&vh->vh_dp);
for (i = 0; i < NVDIR; i++)
dvh_swap_volume_directory(vh->vh_vd + i);
for (i = 0; i < NPARTAB; i++)
dvh_swap_partition_table(vh->vh_pt + i);
swap_int(vh->vh_csum);
}
struct dvh_handle *
dvh_open(const char *vh, int mode)
{
struct dvh_handle *dvh = NULL;
int flags, res, fd = 0;
if (mode == DVH_READONLY)
flags = O_RDONLY;
else if (mode == DVH_READWRITE)
flags = O_RDWR;
else
return NULL;
dvh = malloc(sizeof(struct dvh_handle));
if (dvh == 0)
return NULL;
fd = open(vh, flags);
if (fd == -1) goto out;
res = pread(fd, &dvh->dvh_vh, sizeof(struct volume_header), 0);
if (res != sizeof(struct volume_header)) {
fprintf(stderr, "dvh_open: short read.\n");
goto out;
}
if (verify_vh(dvh)) {
fprintf(stderr, "dvh_open: Bad volume header\n");
goto out;
}
dvh_swap_volume_header(&dvh->dvh_vh);
dvh->dvh_fd = fd;
return dvh;
out:
if (fd) close(fd);
if (dvh) free(dvh);
return NULL;
}
void
dvh_close(struct dvh_handle *dvh)
{
close(dvh->dvh_fd);
free(dvh);
}
void
dvh_vh_to_file(const struct dvh_handle *dvh, const char *vh_name,
const char *u_name)
{
const struct volume_header *vh = &dvh->dvh_vh;
const struct volume_directory *vd = vh->vh_vd;
char *buf;
int i, res, ofd;
for (i = 0; i < NVDIR; i++) {
if (strncmp(vh_name, vd->vd_name, VDNAMESIZE) == 0)
break;
vd++;
}
if (i == NVDIR)
die("Not found");
ofd = open(u_name, O_RDWR | O_CREAT | O_TRUNC, 0666);
if (ofd == -1)
die("Couldn't open destination fd");
buf = malloc(vd->vd_nbytes);
if (buf == NULL)
die("No memory");
res = pread(dvh->dvh_fd, buf, vd->vd_nbytes, vd->vd_lbn * blksize);
if (res != vd->vd_nbytes)
die("Short read");
res = pwrite(ofd, buf, vd->vd_nbytes, 0);
if (res != vd->vd_nbytes) {
unlink(u_name);
die("Short write");
}
free(buf);
}
void
dvh_file_to_vh(struct dvh_handle *dvh, const char *u_name, const char *vh_name)
{
struct volume_header *vh = &dvh->dvh_vh;
struct volume_directory *vd = vh->vh_vd;
struct stat istat;
long size;
int i, res, ifd, dest, num=0, newAdded=0;
char *buf[NVDIR];
ifd = open(u_name, O_RDONLY);
if (ifd == -1)
die("Couldn't open input fd");
res = fstat(ifd, &istat);
if (res == -1)
die("Couldn't stat source file");
/* calculate free blocks in vh */
size = vh->vh_pt[8].pt_nblks /* total vh size */
- ( vh->vh_pt[8].pt_firstlbn + 4 ) /* reserved area */
- (( istat.st_size + blksize - 1 ) / blksize ); /* pad to blocksize */
/*
* Are we replacing an existing file, check for enough space and free
* entry in volume header
*/
for (i = 0; i < NVDIR; i++) {
if (strncmp(vh_name, vd->vd_name, VDNAMESIZE) == 0) {
/* It's an existing file, delete it. */
memset(vd->vd_name, 0, VDNAMESIZE);
vd->vd_nbytes = 0;
}
if ( vd->vd_nbytes ) {
size -= (vd->vd_nbytes + blksize - 1 ) / blksize; /* pad to blocksize */
num++;
}
vd++;
}
if ( num == NVDIR )
die("No more free entries in volume header");
if ( size <= 0 )
die("Not enough space left in volume header");
/* copy all the other entries into a buffer */
vd = vh->vh_vd;
for (i = 0; i < NVDIR; i++) {
if ( vd->vd_nbytes ) {
buf[i] = malloc(vd->vd_nbytes);
if (buf[i] == NULL)
die("No memory");
res = pread(dvh->dvh_fd, buf[i], vd->vd_nbytes,
vd->vd_lbn * blksize);
dprintf("Copying entry %d to tmp buffer\n", i);
if (res != vd->vd_nbytes)
die("Short read");
} else
buf[i] = NULL;
vd++;
}
/* look for a free entry and add the new one */
vd = vh->vh_vd;
/* XXX The number 4 is observed from the IRIX dvh. */
dest = vh->vh_pt[8].pt_firstlbn + 4;
for (i = 0; i < NVDIR; i++) {
/*
* add new entry if we find a free entry and we've not already
* done it
*/
if ( ! vd->vd_nbytes && ! newAdded ) {
dprintf("Adding new entry at position %d\n", i);
vd->vd_nbytes = istat.st_size;
strncpy(vd->vd_name, vh_name, VDNAMESIZE);
newAdded = 1;
buf[i] = malloc(vd->vd_nbytes);
if (buf[i] == NULL)
die("No memory");
res = pread(ifd, buf[i], vd->vd_nbytes, 0);
if (res != vd->vd_nbytes) {
die("Short read");
}
close(ifd);
}
if ( vd->vd_nbytes ) { /* write buf to Volume Directory */
dprintf("Writing buf[%d]\n", i);
vd->vd_lbn = dest;
res = pwrite(dvh->dvh_fd, buf[i], vd->vd_nbytes,
vd->vd_lbn * blksize);
if (res != vd->vd_nbytes) {
fprintf(stderr, "Wrote %d not %d\n", res,
vd->vd_nbytes);
die("Short write");
}
}
dest += (vd->vd_nbytes + blksize - 1) / blksize;
vd++;
}
for ( i = 0; i < NVDIR; i++) {
if( buf[i] )
free( buf[i] );
}
/* write the new volume header too! */
dvh_swap_volume_header(vh);
recalc_vh_csum(dvh);
dprintf("About to rewrite the volume header: ");
res = pwrite(dvh->dvh_fd, vh, sizeof(struct volume_header), 0);
if ( res != sizeof(struct volume_header )) {
die("Short write of volume header - bye bye\n");
}
dprintf("wrote %d bytes\n", res);
}
void
dvh_vh_remove(struct dvh_handle *dvh, const char *vh_name)
{
struct volume_header *vh = &dvh->dvh_vh;
struct volume_directory *vd = vh->vh_vd;
int i, res, dest, found = 0;
char *buf[NVDIR];
/* copy all the other entries into a buffer */
vd = vh->vh_vd;
for (i = 0; i < NVDIR; i++) {
if (strncmp(vh_name, vd->vd_name, VDNAMESIZE) == 0) {
memset(vd->vd_name, 0, VDNAMESIZE);
vd->vd_nbytes = 0;
found = 1;
}
if ( vd->vd_nbytes ) {
buf[i] = malloc(vd->vd_nbytes);
if (buf[i] == NULL)
die("No memory");
res = pread(dvh->dvh_fd, buf[i], vd->vd_nbytes,
vd->vd_lbn * blksize);
dprintf("Copying entry %d to tmp buffer\n", i);
if (res != vd->vd_nbytes)
die("Short read");
} else
buf[i] = NULL;
vd++;
}
if ( ! found )
die("Not found");
vd = vh->vh_vd;
/* XXX The number 4 is observed from the IRIX dvh. */
dest = vh->vh_pt[8].pt_firstlbn + 4;
for (i = 0; i < NVDIR; i++) {
if ( vd->vd_nbytes ) { /* write buf to Volume Directory */
dprintf("Writing buf[%d]\n", i);
vd->vd_lbn = dest;
res = pwrite(dvh->dvh_fd, buf[i], vd->vd_nbytes,
vd->vd_lbn * blksize);
if (res != vd->vd_nbytes) {
fprintf(stderr, "Wrote %d not %d\n", res,
vd->vd_nbytes);
die("Short write");
}
free( buf[i] );
}
dest += (vd->vd_nbytes + 511) / 512; /* XXX Blocksize */
vd++;
}
/* write the new volume header too! */
dvh_swap_volume_header(vh);
recalc_vh_csum(dvh);
dprintf("About to rewrite the volume header: ");
res = pwrite(dvh->dvh_fd, vh, sizeof(struct volume_header), 0);
if ( res != sizeof(struct volume_header )) {
die("Short write of volume header - bye bye\n");
}
dprintf("wrote %d bytes\n", res);
}
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