root / vmdk2raw.c @ d1d9f421
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/*
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vmdk2raw: convert vmware images to raw disk images
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Copyright (C) Net Integration Technologies 2004
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Copyright (C) Matthew Chapman 2003
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <unistd.h> |
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#include <fcntl.h> |
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#include <inttypes.h> |
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#include <sys/types.h> |
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#include <string.h> |
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#include <sys/stat.h> |
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#include <errno.h> |
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#include "vmdk.h" |
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#include "config-host.h" |
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static struct cowdisk_header header; |
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static struct vmdisk_header header4; |
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static off64_t disk_limit;
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static unsigned int granule_size; |
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static uint32_t *l1dir;
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static unsigned int cached_l2dir; |
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static uint32_t l2dir[L2_SIZE];
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static struct vmdk_prm { |
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uint32_t grain_table_size; |
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uint32_t sectors_per_grain; |
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uint32_t sectors_per_table; |
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uint32_t directory_size; |
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} vdsk; |
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static size_t read_physical(int fd, off64_t offset, size_t length, void *buffer) |
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{ |
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size_t n; |
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if (lseek64(fd, offset, SEEK_SET) == -1) { |
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printf(" error trying to seek lseek to %lld", offset);
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return -1; |
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} |
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n = read(fd, buffer, length); |
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if (n == -1) { |
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printf("read from disk %lld", offset);
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return -1; |
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} |
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return n;
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} |
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static int read_l1dir(int fd, size_t offset, int num) |
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{ |
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l1dir = malloc(sizeof(*l1dir) * num);
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if (!l1dir)
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return -1; |
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return read_physical(fd, offset << SECTOR_BITS, sizeof(*l1dir) * num, (char *)l1dir) != (sizeof(*l1dir) * num); |
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} |
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static int read_l2dir(int fd, size_t offset, int num) |
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{ |
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return read_physical(fd, offset << SECTOR_BITS, sizeof(l2dir[0]) * num, (char *)l2dir) != sizeof(l2dir); |
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} |
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static size_t copy_virtual(struct vmdk_prm *dsk, int in_fd, int out_fd, off64_t offset, void *buffer, size_t length) |
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{ |
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unsigned int granule_offset; |
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unsigned int grain_index; |
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unsigned int sector_map_idx; |
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granule_offset = offset % granule_size; |
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length = MIN(length, granule_size - granule_offset); |
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length = MIN(length, disk_limit - offset); |
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sector_map_idx = (offset >> SECTOR_BITS) / dsk->sectors_per_table; |
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if (sector_map_idx >= dsk->directory_size) {
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fprintf(stderr, "cannot locate grain table for %d in %d\n", sector_map_idx, dsk->directory_size);
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return -1; |
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} |
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if (l1dir[sector_map_idx] == 0) |
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goto zero_fill;
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if (sector_map_idx != cached_l2dir) {
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if (read_l2dir(in_fd, l1dir[sector_map_idx], dsk->grain_table_size)) {
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fprintf(stderr, "read failed\n");
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return -1; |
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} |
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cached_l2dir = sector_map_idx; |
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} |
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grain_index = ((offset >> SECTOR_BITS) % dsk->sectors_per_table) / dsk->sectors_per_grain; |
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if (grain_index >= dsk->grain_table_size) {
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fprintf(stderr, "grain to large");
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return -1; |
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} |
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if (l2dir[grain_index] == 0) |
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goto zero_fill;
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if (read_physical(in_fd, (l2dir[grain_index] << SECTOR_BITS) + granule_offset, length, buffer) != length) {
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fprintf(stderr, "read error 2\n");
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return -1; |
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} |
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write(out_fd, buffer, length); |
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return length;
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zero_fill:
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/* the last chunk of the file can not be sparse
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* or the file will be truncated */
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if (offset + length >= disk_limit) {
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if (lseek64(out_fd, length-1, SEEK_CUR) == (off_t)-1) |
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perror("lseek");
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/* write the last NULL byte instead of seeking */
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const char nil = 0; |
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write(out_fd, &nil, 1);
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} else {
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if (lseek64(out_fd, length, SEEK_CUR) == (off_t)-1) |
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perror("lseek");
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} |
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return length;
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} |
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static int open_vmdk4(int fd) |
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{ |
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if (read(fd, &header4, sizeof(header4)) != sizeof(header4)) { |
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perror("read from disk");
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return -1; |
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} |
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granule_size = header4.granularity << SECTOR_BITS; |
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disk_limit = header4.capacity << SECTOR_BITS; |
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cached_l2dir = -1;
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vdsk.grain_table_size = header4.num_gtes_per_gte; |
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vdsk.sectors_per_grain = header4.granularity; |
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vdsk.sectors_per_table = vdsk.grain_table_size * vdsk.sectors_per_grain; |
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vdsk.directory_size = (header4.capacity + vdsk.sectors_per_table - 1) / vdsk.sectors_per_table + 1; |
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if (read_l1dir(fd, header4.rgd_offset, vdsk.directory_size))
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return -1; |
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return 0; |
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} |
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static int open_vmdk3(int fd) |
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{ |
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if (read(fd, &header, sizeof(header)) != sizeof(header)) { |
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perror("read from disk\n");
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return -1; |
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} |
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granule_size = header.granularity << SECTOR_BITS; |
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vdsk.sectors_per_grain = header.granularity; |
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vdsk.grain_table_size = L2_SIZE; |
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vdsk.sectors_per_table = vdsk.grain_table_size * vdsk.sectors_per_grain; |
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vdsk.directory_size = L1_SIZE; |
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if (read_l1dir(fd, header.l1dir_offset, L1_SIZE))
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return -1; |
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disk_limit = header.disk_sectors << SECTOR_BITS; |
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return fd;
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} |
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static int open_vmdk(const char *filename) |
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{ |
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int fd = open(filename, O_RDONLY | O_LARGEFILE);
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if (fd == -1) { |
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perror(filename); |
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return -1; |
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} |
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char magic[4]; |
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if (read(fd, &magic, sizeof(magic)) != sizeof(magic)) { |
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perror("read from disk");
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return -1; |
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} |
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if (!memcmp(magic, "KDMV", sizeof(magic))) { |
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open_vmdk4(fd); |
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} else if (!memcmp(magic, "COWD", sizeof(magic))) { |
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open_vmdk3(fd); |
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} else {
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fprintf(stderr, "%s is not a VMware virtual disk image\n", filename);
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return -1; |
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} |
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cached_l2dir = -1;
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return fd;
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} |
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static void help(void) |
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{ |
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printf("vmdk2raw\n"
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"usage: vmdk2raw vmware_image output_image\n"
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"\n"
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"vmware_image a vmware cow image\n"
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"output_image the created disk image\n"
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); |
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exit(1);
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} |
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#define BUF_SIZE 0x10000 |
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static void copy_disk(in_fd, out_fd) |
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{ |
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char buf[BUF_SIZE];
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off64_t i = 0;
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int ret;
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while (i < disk_limit) {
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ret = copy_virtual(&vdsk, in_fd, out_fd, i, buf, sizeof(buf));
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if (ret < 0) { |
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fprintf(stderr, "copying failed\n");
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exit(-1);
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} |
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i += ret; |
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} |
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} |
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int main(int argc, char **argv) |
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{ |
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int out_fd, in_fd;
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if (argc < 3) |
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help(); |
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in_fd = open_vmdk(argv[1]);
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if (in_fd < 0) { |
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return -1; |
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} |
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out_fd = open(argv[2], O_WRONLY | O_LARGEFILE | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
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if (out_fd < 0) { |
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perror(argv[2]);
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return -1; |
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} |
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copy_disk(in_fd, out_fd); |
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close(out_fd); |
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return 0; |
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} |