5aad7d9a87
Not only is the header unportable, the encoding/decoding functions are as well. Instead, duplicate the handful of small inlines we need into a private header called endian.h. Aside: an alternative approach is to move the encoding/decoding functions to a separate system header. While the header is still nonportable, such an approach would make it possible to re-use the definitions by playing games with include paths. This may be the preferred approach if more (build) utilities need this. This change does not preclude that. In fact, it makes it easier.
262 lines
6.8 KiB
C
262 lines
6.8 KiB
C
/*-
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* Copyright (c) 2014 Juniper Networks, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/errno.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "endian.h"
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#include "image.h"
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#include "format.h"
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#include "mkimg.h"
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#define VMDK_IMAGE_ROUND 1048576
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#define VMDK_MIN_GRAIN_SIZE 8192
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#define VMDK_SECTOR_SIZE 512
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struct vmdk_header {
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uint32_t magic;
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#define VMDK_MAGIC 0x564d444b
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uint32_t version;
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#define VMDK_VERSION 1
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uint32_t flags;
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#define VMDK_FLAGS_NL_TEST (1 << 0)
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#define VMDK_FLAGS_RGT_USED (1 << 1)
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#define VMDK_FLAGS_COMPRESSED (1 << 16)
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#define VMDK_FLAGS_MARKERS (1 << 17)
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uint64_t capacity;
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uint64_t grain_size;
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uint64_t desc_offset;
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uint64_t desc_size;
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uint32_t ngtes;
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#define VMDK_NGTES 512
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uint64_t rgd_offset;
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uint64_t gd_offset;
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uint64_t overhead;
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uint8_t unclean;
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uint32_t nl_test;
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#define VMDK_NL_TEST 0x0a200d0a
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uint16_t compress;
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#define VMDK_COMPRESS_NONE 0
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#define VMDK_COMPRESS_DEFLATE 1
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char padding[433];
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} __attribute__((__packed__));
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static const char desc_fmt[] =
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"# Disk DescriptorFile\n"
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"version=%d\n"
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"CID=%08x\n"
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"parentCID=ffffffff\n"
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"createType=\"monolithicSparse\"\n"
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"# Extent description\n"
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"RW %ju SPARSE \"%s\"\n"
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"# The Disk Data Base\n"
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"#DDB\n"
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"ddb.adapterType = \"ide\"\n"
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"ddb.geometry.cylinders = \"%u\"\n"
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"ddb.geometry.heads = \"%u\"\n"
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"ddb.geometry.sectors = \"%u\"\n";
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static uint64_t grainsz;
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static int
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vmdk_resize(lba_t imgsz)
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{
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uint64_t imagesz;
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imagesz = imgsz * secsz;
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imagesz = (imagesz + VMDK_IMAGE_ROUND - 1) & ~(VMDK_IMAGE_ROUND - 1);
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grainsz = (blksz < VMDK_MIN_GRAIN_SIZE) ? VMDK_MIN_GRAIN_SIZE : blksz;
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if (verbose)
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fprintf(stderr, "VMDK: image size = %ju, grain size = %ju\n",
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(uintmax_t)imagesz, (uintmax_t)grainsz);
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grainsz /= VMDK_SECTOR_SIZE;
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return (image_set_size(imagesz / secsz));
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}
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static int
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vmdk_write(int fd)
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{
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struct vmdk_header hdr;
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uint32_t *gt, *gd, *rgd;
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char *buf, *desc;
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off_t cur, lim;
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uint64_t imagesz;
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lba_t blkofs, blkcnt;
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size_t gdsz, gtsz;
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uint32_t sec, cursec;
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int error, desc_len, n, ngrains, ngts;
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imagesz = (image_get_size() * secsz) / VMDK_SECTOR_SIZE;
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memset(&hdr, 0, sizeof(hdr));
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le32enc(&hdr.magic, VMDK_MAGIC);
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le32enc(&hdr.version, VMDK_VERSION);
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le32enc(&hdr.flags, VMDK_FLAGS_NL_TEST | VMDK_FLAGS_RGT_USED);
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le64enc(&hdr.capacity, imagesz);
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le64enc(&hdr.grain_size, grainsz);
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n = asprintf(&desc, desc_fmt, 1 /*version*/, 0 /*CID*/,
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(uintmax_t)imagesz /*size*/, "" /*name*/,
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ncyls /*cylinders*/, nheads /*heads*/, nsecs /*sectors*/);
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if (n == -1)
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return (ENOMEM);
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desc_len = (n + VMDK_SECTOR_SIZE - 1) & ~(VMDK_SECTOR_SIZE - 1);
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desc = realloc(desc, desc_len);
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memset(desc + n, 0, desc_len - n);
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le64enc(&hdr.desc_offset, 1);
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le64enc(&hdr.desc_size, desc_len / VMDK_SECTOR_SIZE);
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le32enc(&hdr.ngtes, VMDK_NGTES);
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sec = desc_len / VMDK_SECTOR_SIZE + 1;
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ngrains = imagesz / grainsz;
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ngts = (ngrains + VMDK_NGTES - 1) / VMDK_NGTES;
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gdsz = (ngts * sizeof(uint32_t) + VMDK_SECTOR_SIZE - 1) &
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~(VMDK_SECTOR_SIZE - 1);
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gd = calloc(1, gdsz);
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if (gd == NULL) {
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free(desc);
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return (ENOMEM);
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}
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le64enc(&hdr.gd_offset, sec);
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sec += gdsz / VMDK_SECTOR_SIZE;
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for (n = 0; n < ngts; n++) {
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le32enc(gd + n, sec);
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sec += VMDK_NGTES * sizeof(uint32_t) / VMDK_SECTOR_SIZE;
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}
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rgd = calloc(1, gdsz);
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if (rgd == NULL) {
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free(gd);
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free(desc);
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return (ENOMEM);
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}
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le64enc(&hdr.rgd_offset, sec);
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sec += gdsz / VMDK_SECTOR_SIZE;
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for (n = 0; n < ngts; n++) {
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le32enc(rgd + n, sec);
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sec += VMDK_NGTES * sizeof(uint32_t) / VMDK_SECTOR_SIZE;
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}
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sec = (sec + grainsz - 1) & ~(grainsz - 1);
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if (verbose)
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fprintf(stderr, "VMDK: overhead = %ju\n",
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(uintmax_t)(sec * VMDK_SECTOR_SIZE));
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le64enc(&hdr.overhead, sec);
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be32enc(&hdr.nl_test, VMDK_NL_TEST);
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gt = calloc(ngts, VMDK_NGTES * sizeof(uint32_t));
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if (gt == NULL) {
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free(rgd);
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free(gd);
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free(desc);
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return (ENOMEM);
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}
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gtsz = ngts * VMDK_NGTES * sizeof(uint32_t);
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cursec = sec;
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blkcnt = (grainsz * VMDK_SECTOR_SIZE) / secsz;
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for (n = 0; n < ngrains; n++) {
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blkofs = n * blkcnt;
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if (image_data(blkofs, blkcnt)) {
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le32enc(gt + n, cursec);
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cursec += grainsz;
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}
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}
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error = 0;
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if (!error && sparse_write(fd, &hdr, VMDK_SECTOR_SIZE) < 0)
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error = errno;
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if (!error && sparse_write(fd, desc, desc_len) < 0)
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error = errno;
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if (!error && sparse_write(fd, gd, gdsz) < 0)
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error = errno;
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if (!error && sparse_write(fd, gt, gtsz) < 0)
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error = errno;
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if (!error && sparse_write(fd, rgd, gdsz) < 0)
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error = errno;
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if (!error && sparse_write(fd, gt, gtsz) < 0)
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error = errno;
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free(gt);
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free(rgd);
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free(gd);
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free(desc);
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if (error)
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return (error);
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cur = VMDK_SECTOR_SIZE + desc_len + (gdsz + gtsz) * 2;
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lim = sec * VMDK_SECTOR_SIZE;
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if (cur < lim) {
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buf = calloc(1, VMDK_SECTOR_SIZE);
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if (buf == NULL)
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error = ENOMEM;
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while (!error && cur < lim) {
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if (sparse_write(fd, buf, VMDK_SECTOR_SIZE) < 0)
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error = errno;
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cur += VMDK_SECTOR_SIZE;
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}
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if (buf != NULL)
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free(buf);
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}
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if (error)
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return (error);
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blkcnt = (grainsz * VMDK_SECTOR_SIZE) / secsz;
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for (n = 0; n < ngrains; n++) {
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blkofs = n * blkcnt;
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if (image_data(blkofs, blkcnt)) {
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error = image_copyout_region(fd, blkofs, blkcnt);
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if (error)
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return (error);
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}
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}
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return (image_copyout_done(fd));
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}
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static struct mkimg_format vmdk_format = {
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.name = "vmdk",
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.description = "Virtual Machine Disk",
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.resize = vmdk_resize,
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.write = vmdk_write,
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};
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FORMAT_DEFINE(vmdk_format);
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