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rufus/src/vhd.c

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/*
* Rufus: The Reliable USB Formatting Utility
* Virtual Disk Handling functions
* Copyright © 2013-2014 Pete Batard <pete@akeo.ie>
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <windows.h>
#include <stdlib.h>
#include <io.h>
#include <rpc.h>
#include <time.h>
#include "rufus.h"
#include "msapi_utf8.h"
#include "drive.h"
#include "registry.h"
#if defined(_MSC_VER)
#define bswap_uint64 _byteswap_uint64
#define bswap_uint32 _byteswap_ulong
#define bswap_uint16 _byteswap_ushort
#else
#define bswap_uint64 __builtin_bswap64
#define bswap_uint32 __builtin_bswap32
#define bswap_uint16 __builtin_bswap16
#endif
#define VHD_FOOTER_COOKIE { 'c', 'o', 'n', 'e', 'c', 't', 'i', 'x' }
#define VHD_FOOTER_FEATURES_NONE 0x00000000
#define VHD_FOOTER_FEATURES_TEMPORARY 0x00000001
#define VHD_FOOTER_FEATURES_RESERVED 0x00000002
#define VHD_FOOTER_FILE_FORMAT_V1_0 0x00010000
#define VHD_FOOTER_DATA_OFFSET_FIXED_DISK 0xFFFFFFFFFFFFFFFFULL
#define VHD_FOOTER_CREATOR_HOST_OS_WINDOWS { 'W', 'i', '2', 'k' }
#define VHD_FOOTER_CREATOR_HOST_OS_MAC { 'M', 'a', 'c', ' ' }
#define VHD_FOOTER_TYPE_FIXED_HARD_DISK 0x00000002
#define VHD_FOOTER_TYPE_DYNAMIC_HARD_DISK 0x00000003
#define VHD_FOOTER_TYPE_DIFFER_HARD_DISK 0x00000004
#define SECONDS_SINCE_JAN_1ST_2000 946684800
/*
* VHD Fixed HD footer (Big Endian)
* http://download.microsoft.com/download/f/f/e/ffef50a5-07dd-4cf8-aaa3-442c0673a029/Virtual%20Hard%20Disk%20Format%20Spec_10_18_06.doc
* NB: If a dymamic implementation is needed, check the GPL v3 compatible C++ implementation from:
* https://sourceforge.net/p/urbackup/backend/ci/master/tree/fsimageplugin/
*/
#pragma pack(push, 1)
typedef struct vhd_footer {
char cookie[8];
uint32_t features;
uint32_t file_format_version;
uint64_t data_offset;
uint32_t timestamp;
char creator_app[4];
uint32_t creator_version;
char creator_host_os[4];
uint64_t original_size;
uint64_t current_size;
union {
uint32_t geometry;
struct {
uint16_t cylinders;
uint8_t heads;
uint8_t sectors;
} chs;
} disk_geometry;
uint32_t disk_type;
uint32_t checksum;
uuid_t unique_id;
uint8_t saved_state;
uint8_t reserved[427];
} vhd_footer;
#pragma pack(pop)
// WIM API Prototypes
#define WIM_GENERIC_READ GENERIC_READ
#define WIM_OPEN_EXISTING OPEN_EXISTING
PF_TYPE_DECL(WINAPI, HANDLE, WIMCreateFile, (PWSTR, DWORD, DWORD, DWORD, DWORD, PDWORD));
PF_TYPE_DECL(WINAPI, BOOL, WIMSetTemporaryPath, (HANDLE, PWSTR));
PF_TYPE_DECL(WINAPI, HANDLE, WIMLoadImage, (HANDLE, DWORD));
PF_TYPE_DECL(WINAPI, BOOL, WIMExtractImagePath, (HANDLE, PWSTR, PWSTR, DWORD));
PF_TYPE_DECL(WINAPI, BOOL, WIMCloseHandle, (HANDLE));
PF_TYPE_DECL(RPC_ENTRY, RPC_STATUS, UuidCreate, (UUID __RPC_FAR*));
static BOOL has_wimgapi = FALSE, has_7z = FALSE;
static char sevenzip_path[MAX_PATH];
static const char conectix_str[] = VHD_FOOTER_COOKIE;
static BOOL Get7ZipPath(void)
{
if ( (GetRegistryKeyStr(REGKEY_HKCU, "7-Zip\\Path", sevenzip_path, sizeof(sevenzip_path)))
|| (GetRegistryKeyStr(REGKEY_HKLM, "7-Zip\\Path", sevenzip_path, sizeof(sevenzip_path))) ) {
safe_strcat(sevenzip_path, sizeof(sevenzip_path), "\\7z.exe");
return (_access(sevenzip_path, 0) != -1);
}
return FALSE;
}
BOOL AppendVHDFooter(const char* vhd_path)
{
const char creator_os[4] = VHD_FOOTER_CREATOR_HOST_OS_WINDOWS;
const char creator_app[4] = { 'r', 'u', 'f', 'u' };
BOOL r = FALSE;
DWORD size;
LARGE_INTEGER li;
HANDLE handle = INVALID_HANDLE_VALUE;
vhd_footer* footer = NULL;
uint64_t totalSectors;
uint16_t cylinders = 0;
uint8_t heads, sectorsPerTrack;
uint32_t cylinderTimesHeads;
uint32_t checksum;
size_t i;
PF_INIT(UuidCreate, Rpcrt4);
handle = CreateFileU(vhd_path, GENERIC_WRITE, FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
li.QuadPart = 0;
if ((handle == INVALID_HANDLE_VALUE) || (!SetFilePointerEx(handle, li, &li, FILE_END))) {
uprintf("Could not open image '%s': %s", vhd_path, WindowsErrorString());
goto out;
}
footer = (vhd_footer*)calloc(1, sizeof(vhd_footer));
if (footer == NULL) {
uprintf("Could not allocate VHD footer");
goto out;
}
memcpy(footer->cookie, conectix_str, sizeof(footer->cookie));
footer->features = bswap_uint32(VHD_FOOTER_FEATURES_RESERVED);
footer->file_format_version = bswap_uint32(VHD_FOOTER_FILE_FORMAT_V1_0);
footer->data_offset = bswap_uint64(VHD_FOOTER_DATA_OFFSET_FIXED_DISK);
footer->timestamp = bswap_uint32(_time32(NULL) - SECONDS_SINCE_JAN_1ST_2000);
memcpy(footer->creator_app, creator_app, sizeof(creator_app));
footer->creator_version = bswap_uint32((rufus_version[0]<<16)|rufus_version[1]);
memcpy(footer->creator_host_os, creator_os, sizeof(creator_os));
footer->original_size = bswap_uint64(li.QuadPart);
footer->current_size = footer->original_size;
footer->disk_type = bswap_uint32(VHD_FOOTER_TYPE_FIXED_HARD_DISK);
if ((pfUuidCreate == NULL) || (pfUuidCreate(&footer->unique_id) != RPC_S_OK))
uprintf("Warning: could not set VHD UUID");
// Compute CHS, as per the VHD specs
totalSectors = li.QuadPart / 512;
if (totalSectors > 65535 * 16 * 255) {
totalSectors = 65535 * 16 * 255;
}
if (totalSectors >= 65535 * 16 * 63) {
sectorsPerTrack = 255;
heads = 16;
cylinderTimesHeads = (uint32_t)(totalSectors / sectorsPerTrack);
} else {
sectorsPerTrack = 17;
cylinderTimesHeads = (uint32_t)(totalSectors / sectorsPerTrack);
heads = (cylinderTimesHeads + 1023) / 1024;
if (heads < 4) {
heads = 4;
}
if (cylinderTimesHeads >= ((uint32_t)heads * 1024) || heads > 16) {
sectorsPerTrack = 31;
heads = 16;
cylinderTimesHeads = (uint32_t)(totalSectors / sectorsPerTrack);
}
if (cylinderTimesHeads >= ((uint32_t)heads * 1024)) {
sectorsPerTrack = 63;
heads = 16;
cylinderTimesHeads = (uint32_t)(totalSectors / sectorsPerTrack);
}
}
cylinders = cylinderTimesHeads / heads;
footer->disk_geometry.chs.cylinders = bswap_uint16(cylinders);
footer->disk_geometry.chs.heads = heads;
footer->disk_geometry.chs.sectors = sectorsPerTrack;
// Compute the VHD footer checksum
for (checksum=0, i=0; i<sizeof(vhd_footer); i++)
checksum += ((uint8_t*)footer)[i];
footer->checksum = bswap_uint32(~checksum);
if (!WriteFile(handle, footer, sizeof(vhd_footer), &size, NULL) || (size != sizeof(vhd_footer))) {
uprintf("Could not write VHD footer: %s", WindowsErrorString());
goto out;
}
r = TRUE;
out:
safe_free(footer);
safe_closehandle(handle);
return r;
}
BOOL IsHDImage(const char* path)
{
HANDLE handle = INVALID_HANDLE_VALUE;
LARGE_INTEGER liImageSize;
vhd_footer* footer = NULL;
DWORD size;
size_t i;
uint32_t checksum, old_checksum;
LARGE_INTEGER ptr;
handle = CreateFileU(path, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL);
if (handle == INVALID_HANDLE_VALUE) {
uprintf("Could not open image '%s'", path);
goto out;
}
iso_report.is_bootable_img = AnalyzeMBR(handle, "Image");
if (!GetFileSizeEx(handle, &liImageSize)) {
uprintf("Could not get image size: %s", WindowsErrorString());
goto out;
}
iso_report.projected_size = (uint64_t)liImageSize.QuadPart;
size = sizeof(vhd_footer);
if (iso_report.projected_size >= (512 + size)) {
footer = (vhd_footer*)malloc(size);
ptr.QuadPart = iso_report.projected_size - size;
if ( (footer == NULL) || (!SetFilePointerEx(handle, ptr, NULL, FILE_BEGIN)) ||
(!ReadFile(handle, footer, size, &size, NULL)) || (size != sizeof(vhd_footer)) ) {
uprintf("Could not read VHD footer");
goto out;
}
if (memcmp(footer->cookie, conectix_str, sizeof(footer->cookie)) == 0) {
iso_report.projected_size -= sizeof(vhd_footer);
if ( (bswap_uint32(footer->file_format_version) != VHD_FOOTER_FILE_FORMAT_V1_0)
|| (bswap_uint32(footer->disk_type) != VHD_FOOTER_TYPE_FIXED_HARD_DISK)) {
uprintf("Unsupported type of VHD image");
iso_report.is_bootable_img = FALSE;
goto out;
}
// Might as well validate the checksum while we're at it
old_checksum = bswap_uint32(footer->checksum);
footer->checksum = 0;
for (checksum=0, i=0; i<sizeof(vhd_footer); i++)
checksum += ((uint8_t*)footer)[i];
checksum = ~checksum;
if (checksum != old_checksum)
uprintf("Warning: VHD footer seems corrupted (checksum: %04X, expected: %04X)", old_checksum, checksum);
// Need to remove the footer from our payload
uprintf("Image is a Fixed Hard Disk VHD file");
iso_report.is_vhd = TRUE;
}
}
out:
safe_free(footer);
safe_closehandle(handle);
return iso_report.is_bootable_img;
}
// Find out if we have any way to extract WIM files on this platform
BOOL WimExtractCheck(void)
{
PF_INIT(WIMCreateFile, Wimgapi);
PF_INIT(WIMSetTemporaryPath, Wimgapi);
PF_INIT(WIMLoadImage, Wimgapi);
PF_INIT(WIMExtractImagePath, Wimgapi);
PF_INIT(WIMCloseHandle, Wimgapi);
has_wimgapi = (pfWIMCreateFile && pfWIMSetTemporaryPath && pfWIMLoadImage && pfWIMExtractImagePath && pfWIMCloseHandle);
has_7z = Get7ZipPath();
uprintf("WIM extraction method(s) supported: %s%s%s\n", has_7z?"7z":(has_wimgapi?"":"NONE"),
(has_wimgapi && has_7z)?", ":"", has_wimgapi?"wimgapi.dll":"");
return (has_wimgapi || has_7z);
}
// Extract a file from a WIM image using wimgapi.dll (Windows 7 or later)
// NB: if you want progress from a WIM callback, you must run the WIM API call in its own thread
// (which we don't do here) as it won't work otherwise. Thanks go to Erwan for figuring this out!
static BOOL WimExtractFile_API(const char* image, int index, const char* src, const char* dst)
{
BOOL r = FALSE;
DWORD dw = 0;
HANDLE hWim = NULL;
HANDLE hImage = NULL;
wchar_t wtemp[MAX_PATH] = {0};
wchar_t* wimage = utf8_to_wchar(image);
wchar_t* wsrc = utf8_to_wchar(src);
wchar_t* wdst = utf8_to_wchar(dst);
PF_INIT_OR_OUT(WIMCreateFile, Wimgapi);
PF_INIT_OR_OUT(WIMSetTemporaryPath, Wimgapi);
PF_INIT_OR_OUT(WIMLoadImage, Wimgapi);
PF_INIT_OR_OUT(WIMExtractImagePath, Wimgapi);
PF_INIT_OR_OUT(WIMCloseHandle, Wimgapi);
uprintf("Opening: %s:[%d] (API)\n", image, index);
if (GetTempPathW(ARRAYSIZE(wtemp), wtemp) == 0) {
uprintf(" Could not fetch temp path: %s\n", WindowsErrorString());
goto out;
}
hWim = pfWIMCreateFile(wimage, WIM_GENERIC_READ, WIM_OPEN_EXISTING, 0, 0, &dw);
if (hWim == NULL) {
uprintf(" Could not access image: %s\n", WindowsErrorString());
goto out;
}
if (!pfWIMSetTemporaryPath(hWim, wtemp)) {
uprintf(" Could not set temp path: %s\n", WindowsErrorString());
goto out;
}
hImage = pfWIMLoadImage(hWim, (DWORD)index);
if (hImage == NULL) {
uprintf(" Could not set index: %s\n", WindowsErrorString());
goto out;
}
uprintf("Extracting: %s (From %s)\n", dst, src);
if (!pfWIMExtractImagePath(hImage, wsrc, wdst, 0)) {
uprintf(" Could not extract file: %s\n", WindowsErrorString());
goto out;
}
r = TRUE;
UpdateProgress(OP_FINALIZE, -1.0f);
out:
if ((hImage != NULL) || (hWim != NULL)) {
uprintf("Closing: %s\n", image);
}
if (hImage != NULL) pfWIMCloseHandle(hImage);
if (hWim != NULL) pfWIMCloseHandle(hWim);
safe_free(wimage);
safe_free(wsrc);
safe_free(wdst);
return r;
}
// Extract a file from a WIM image using 7-Zip
static BOOL WimExtractFile_7z(const char* image, int index, const char* src, const char* dst)
{
size_t i;
STARTUPINFOA si = {0};
PROCESS_INFORMATION pi = {0};
char cmdline[MAX_PATH];
char tmpdst[MAX_PATH];
uprintf("Opening: %s:[%d] (7-Zip)\n", image, index);
safe_strcpy(tmpdst, sizeof(tmpdst), dst);
for (i=safe_strlen(tmpdst); i>0; i--) {
if (tmpdst[i] == '\\')
break;
}
tmpdst[i] = 0;
si.cb = sizeof(si);
safe_sprintf(cmdline, sizeof(cmdline), "7z -y e \"%s\" %d\\%s", image, index, src);
uprintf("Extracting: %s (From %s)\n", dst, src);
if (!CreateProcessU(sevenzip_path, cmdline, NULL, NULL, FALSE, CREATE_NO_WINDOW, NULL, tmpdst, &si, &pi)) {
uprintf(" Could not launch 7z.exe: %s\n", WindowsErrorString());
return FALSE;
}
WaitForSingleObject(pi.hProcess, INFINITE);
UpdateProgress(OP_FINALIZE, -1.0f);
CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);
safe_strcat(tmpdst, sizeof(tmpdst), "\\bootmgfw.efi");
if (_access(tmpdst, 0) == -1) {
uprintf(" 7z.exe did not extract %s\n", tmpdst);
return FALSE;
}
// coverity[toctou]
if (rename(tmpdst, dst) != 0) {
uprintf(" Could not rename %s to %s\n", tmpdst, dst);
return FALSE;
}
return TRUE;
}
// Extract a file from a WIM image
BOOL WimExtractFile(const char* image, int index, const char* src, const char* dst)
{
if ((!has_wimgapi) && (!has_7z) && (!WimExtractCheck()))
return FALSE;
if ((image == NULL) || (src == NULL) || (dst == NULL))
return FALSE;
// Prefer 7-Zip as, unsurprisingly, it's faster than the Microsoft way,
// but allow fallback if 7-Zip doesn't succeed
return ( (has_7z && WimExtractFile_7z(image, index, src, dst))
|| (has_wimgapi && WimExtractFile_API(image, index, src, dst)) );
}
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