/* vmdk2raw: convert vmware images to raw disk images Copyright (C) Net Integration Technologies 2004 Copyright (C) Matthew Chapman 2003 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <stdlib.h> #include <stdio.h> #include <unistd.h> #include <fcntl.h> #include <inttypes.h> #include <sys/types.h> #include <string.h> #include <sys/stat.h> #include <errno.h> #include "vmdk.h" #include "config-host.h" struct cowdisk_header header; struct cowdisk_header2 header2; off_t disk_base, disk_limit; unsigned int granule_size; uint32_t l1dir[L1_SIZE]; unsigned int cached_l2dir; uint32_t l2dir[L2_SIZE]; size_t read_physical(int fd, off64_t offset, size_t length, void *buffer) { size_t n; if (lseek64(fd, offset, SEEK_SET) == -1) { perror("lseek"); return -1; } n = read(fd, buffer, length); if (n == -1) { perror("read from disk"); return -1; } return n; } size_t copy_virtual(int in_fd, int out_fd, off64_t offset, void *buffer, size_t length) { unsigned int granule_index, granule_offset; unsigned int l1index, l2index; granule_index = offset / granule_size; granule_offset = offset % granule_size; length = MIN(length, granule_size - granule_offset); length = MIN(length, disk_limit - offset); l1index = (granule_index >> L2_BITS) & L1_MASK; l2index = granule_index & L2_MASK; if (l1dir[l1index] == 0) goto zero_fill; if (l1index != cached_l2dir) { if (read_physical(in_fd, (l1dir[l1index] << SECTOR_BITS), sizeof(l2dir), (char *)l2dir) != sizeof(l2dir)) return 0; cached_l2dir = l1index; } if (l2dir[l2index] == 0) goto zero_fill; if (read_physical(in_fd, (l2dir[l2index] << SECTOR_BITS) + granule_offset, length, buffer) != length) return 0; write(out_fd, buffer, length); return length; zero_fill: /* the last chunk of the file can not be sparse * or the file will be truncated */ if (offset + length < disk_limit) { memset(buffer, 0, length); write(out_fd, buffer, length); } else { if (lseek(out_fd, length, SEEK_CUR) == (off_t)-1) perror("lseek"); } return length; } int open_vmdk(const char *filename) { int fd = open(filename, O_RDONLY | O_LARGEFILE); if (fd == -1) { perror(filename); return -1; } if (read(fd, &header, sizeof(header)) != sizeof(header)) { perror("read from disk"); return -1; } if (memcmp(header.magic, "COWD", 4) != 0) { fprintf(stderr, "%s is not a VMware virtual disk image\n", filename); return -1; } granule_size = header.granularity << SECTOR_BITS; if (read_physical(fd, header.l1dir_sector << SECTOR_BITS, sizeof(l1dir), (char *)l1dir) != sizeof(l1dir)) return -1; disk_limit = header.disk_sectors << SECTOR_BITS; cached_l2dir = -1; return fd; } void help(void) { printf("vmdk2raw\n" "usage: vmdk2raw vmware_image output_image\n" "\n" "vmware_image a vmware 2.x/3.x cow image\n" "output_image the created disk image\n" ); exit(1); } #define BUF_SIZE granule_size void copy_disk(in_fd, out_fd) { char buf[BUF_SIZE]; off64_t i = 0; while (i < disk_limit) { i += copy_virtual(in_fd, out_fd, i, buf, sizeof(buf)); } } int main(int argc, char **argv) { int out_fd, in_fd; if (argc < 3) help(); in_fd = open_vmdk(argv[1]); if (in_fd < 0) { return -1; } out_fd = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR); if (out_fd < 0) { perror(argv[2]); return -1; } copy_disk(in_fd, out_fd); close(out_fd); return 0; }