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   1 /*
   2  * wimboot.c
   3  *
   4  * Support for creating WIMBoot pointer files.
   5  *
   6  * See http://technet.microsoft.com/en-us/library/dn594399.aspx for general
   7  * information about WIMBoot.
   8  *
   9  * Note that WIMBoot pointer files are actually implemented on top of the
  10  * Windows Overlay Filesystem filter (WOF).  See wof.h for more info.
  11  */
  12
  13 /*
  14  * Copyright (C) 2014-2016 Eric Biggers
  15  *
  16  * This file is free software; you can redistribute it and/or modify it under
  17  * the terms of the GNU Lesser General Public License as published by the Free
  18  * Software Foundation; either version 3 of the License, or (at your option) any
  19  * later version.
  20  *
  21  * This file is distributed in the hope that it will be useful, but WITHOUT
  22  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  23  * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
  24  * details.
  25  *
  26  * You should have received a copy of the GNU Lesser General Public License
  27  * along with this file; if not, see http://www.gnu.org/licenses/.
  28  */
  29
  30 #ifdef __WIN32__
  31
  32 #ifdef HAVE_CONFIG_H
  33 #  include "config.h"
  34 #endif
  35
  36 #include "wimlib/win32_common.h"
  37
  38 #include "wimlib/assert.h"
  39 #include "wimlib/blob_table.h"
  40 #include "wimlib/inode.h"
  41 #include "wimlib/error.h"
  42 #include "wimlib/util.h"
  43 #include "wimlib/wimboot.h"
  44 #include "wimlib/win32.h"
  45 #include "wimlib/wof.h"
  46
  47 static HANDLE
  48 open_file(const wchar_t *device_name, DWORD desiredAccess)
  49 {
  50         return CreateFile(device_name, desiredAccess,
  51                           FILE_SHARE_VALID_FLAGS, NULL, OPEN_EXISTING,
  52                           FILE_FLAG_BACKUP_SEMANTICS, NULL);
  53 }
  54
  55 static BOOL
  56 query_device(HANDLE h, DWORD code, void *out, DWORD out_size)
  57 {
  58         DWORD bytes_returned;
  59         return DeviceIoControl(h, code, NULL, 0, out, out_size,
  60                                &bytes_returned, NULL);
  61 }
  62
  63 /*
  64  * Gets partition and drive information for the specified path.
  65  *
  66  * @path
  67  *      Absolute path which must begin with a drive letter.  For example, if the
  68  *      path is D:\install.wim, this function will query information about the
  69  *      D: volume.
  70  * @part_info_ret
  71  *      Partition info is returned here.
  72  * @drive_info_ret
  73  *      Drive info is returned here.  The contained partition info will not be
  74  *      valid.
  75  *
  76  * Returns 0 on success, or a positive error code on failure.
  77  */
  78 static int
  79 query_partition_and_disk_info(const wchar_t *path,
  80                               PARTITION_INFORMATION_EX *part_info,
  81                               DRIVE_LAYOUT_INFORMATION_EX *drive_info_ret)
  82 {
  83         wchar_t vol_name[] = L"\\\\.\\X:";
  84         wchar_t disk_name[] = L"\\\\?\\PhysicalDriveXXXXXXXXXX";
  85         HANDLE h = INVALID_HANDLE_VALUE;
  86         VOLUME_DISK_EXTENTS *extents = NULL;
  87         size_t extents_size;
  88         DRIVE_LAYOUT_INFORMATION_EX *drive_info = NULL;
  89         size_t drive_info_size;
  90         int ret;
  91
  92         wimlib_assert(path[0] != L'\0' && path[1] == L':');
  93
  94         *(wcschr(vol_name, L'X')) = path[0];
  95
  96         h = open_file(vol_name, GENERIC_READ);
  97         if (h == INVALID_HANDLE_VALUE) {
  98                 win32_error(GetLastError(), L"\"%ls\": Can't open volume device",
  99                             vol_name);
 100                 ret = WIMLIB_ERR_OPEN;
 101                 goto out;
 102         }
 103
 104         if (!query_device(h, IOCTL_DISK_GET_PARTITION_INFO_EX,
 105                           part_info, sizeof(PARTITION_INFORMATION_EX)))
 106         {
 107                 win32_error(GetLastError(),
 108                             L"\"%ls\": Can't get partition info", vol_name);
 109                 ret = WIMLIB_ERR_READ;
 110                 goto out;
 111         }
 112
 113         extents_size = sizeof(VOLUME_DISK_EXTENTS);
 114         for (;;) {
 115                 extents_size += 4 * sizeof(DISK_EXTENT);
 116                 extents = MALLOC(extents_size);
 117                 if (!extents) {
 118                         ret = WIMLIB_ERR_NOMEM;
 119                         goto out;
 120                 }
 121
 122                 if (query_device(h, IOCTL_VOLUME_GET_VOLUME_DISK_EXTENTS,
 123                                  extents, extents_size))
 124                         break;
 125                 if (GetLastError() != ERROR_MORE_DATA) {
 126                         win32_error(GetLastError(),
 127                                     L"\"%ls\": Can't get volume extent info",
 128                                     vol_name);
 129                         ret = WIMLIB_ERR_READ;
 130                         goto out;
 131                 }
 132                 FREE(extents);
 133         }
 134
 135         CloseHandle(h);
 136         h = INVALID_HANDLE_VALUE;
 137
 138         if (extents->NumberOfDiskExtents != 1) {
 139                 ERROR("\"%ls\": This volume has %"PRIu32" disk extents, "
 140                       "but this code is untested for more than 1",
 141                       vol_name, (u32)extents->NumberOfDiskExtents);
 142                 ret = WIMLIB_ERR_UNSUPPORTED;
 143                 goto out;
 144         }
 145
 146         wsprintf(wcschr(disk_name, L'X'), L"%"PRIu32,
 147                  extents->Extents[0].DiskNumber);
 148
 149         h = open_file(disk_name, GENERIC_READ);
 150         if (h == INVALID_HANDLE_VALUE) {
 151                 win32_error(GetLastError(),
 152                             L"\"%ls\": Can't open disk device", disk_name);
 153                 ret = WIMLIB_ERR_OPEN;
 154                 goto out;
 155         }
 156
 157         drive_info_size = sizeof(DRIVE_LAYOUT_INFORMATION_EX);
 158         for (;;) {
 159                 drive_info_size += 4 * sizeof(PARTITION_INFORMATION_EX);
 160                 drive_info = MALLOC(drive_info_size);
 161                 if (!drive_info) {
 162                         ret = WIMLIB_ERR_NOMEM;
 163                         goto out;
 164                 }
 165
 166                 if (query_device(h, IOCTL_DISK_GET_DRIVE_LAYOUT_EX,
 167                                  drive_info, drive_info_size))
 168                         break;
 169                 if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
 170                         win32_error(GetLastError(),
 171                                     L"\"%ls\": Can't get disk info", disk_name);
 172                         ret = WIMLIB_ERR_READ;
 173                         goto out;
 174                 }
 175                 FREE(drive_info);
 176         }
 177
 178         *drive_info_ret = *drive_info;  /* doesn't include partitions */
 179         CloseHandle(h);
 180         h = INVALID_HANDLE_VALUE;
 181
 182         if (drive_info->PartitionStyle != part_info->PartitionStyle) {
 183                 ERROR("\"%ls\", \"%ls\": Inconsistent partition table type!",
 184                       vol_name, disk_name);
 185                 ret = WIMLIB_ERR_UNSUPPORTED;
 186                 goto out;
 187         }
 188
 189         if (part_info->PartitionStyle == PARTITION_STYLE_GPT) {
 190                 STATIC_ASSERT(sizeof(part_info->Gpt.PartitionId) ==
 191                               sizeof(drive_info->Gpt.DiskId));
 192                 if (!memcmp(&part_info->Gpt.PartitionId,
 193                             &drive_info->Gpt.DiskId,
 194                             sizeof(drive_info->Gpt.DiskId)))
 195                 {
 196                         ERROR("\"%ls\", \"%ls\": Partition GUID is the "
 197                               "same as the disk GUID???", vol_name, disk_name);
 198                         ret = WIMLIB_ERR_UNSUPPORTED;
 199                         goto out;
 200                 }
 201         }
 202
 203         if (part_info->PartitionStyle != PARTITION_STYLE_MBR &&
 204             part_info->PartitionStyle != PARTITION_STYLE_GPT)
 205         {
 206                 ERROR("\"%ls\": Unknown partition style 0x%08"PRIx32,
 207                       vol_name, (u32)part_info->PartitionStyle);
 208                 ret = WIMLIB_ERR_UNSUPPORTED;
 209                 goto out;
 210         }
 211
 212         ret = 0;
 213 out:
 214         FREE(extents);
 215         FREE(drive_info);
 216         if (h != INVALID_HANDLE_VALUE)
 217                 CloseHandle(h);
 218         return ret;
 219 }
 220
 221 /*
 222  * Calculate the size of WimOverlay.dat with one entry added.
 223  *
 224  * @old_hdr
 225  *      Previous WimOverlay.dat contents, or NULL if file did not exist.
 226  * @new_entry_2_size
 227  *      Size of entry_2 being added.
 228  * @size_ret
 229  *      Size will be returned here.
 230  *
 231  * Returns 0 on success, or WIMLIB_ERR_UNSUPPORTED if size overflows 32 bits.
 232  */
 233 static int
 234 calculate_wimoverlay_dat_size(const struct WimOverlay_dat_header *old_hdr,
 235                               u32 new_entry_2_size, u32 *size_ret)
 236 {
 237         u64 size_64;
 238         u32 size;
 239
 240         size_64 = sizeof(struct WimOverlay_dat_header);
 241         if (old_hdr) {
 242                 for (u32 i = 0; i < old_hdr->num_entries; i++) {
 243                         size_64 += sizeof(struct WimOverlay_dat_entry_1);
 244                         size_64 += old_hdr->entry_1s[i].entry_2_length;
 245                 }
 246         }
 247         size_64 += sizeof(struct WimOverlay_dat_entry_1);
 248         size_64 += new_entry_2_size;
 249
 250         size = size_64;
 251         if (size_64 != size)
 252                 return WIMLIB_ERR_UNSUPPORTED;
 253
 254         *size_ret = size;
 255         return 0;
 256 }
 257
 258 /*
 259  * Writes @size bytes of @contents to the named file @path.
 260  *
 261  * Returns 0 on success; WIMLIB_ERR_OPEN or WIMLIB_ERR_WRITE on failure.
 262  */
 263 static int
 264 write_wimoverlay_dat(const wchar_t *path, const void *contents, u32 size)
 265 {
 266         HANDLE h;
 267         DWORD bytes_written;
 268
 269         h = CreateFile(path, GENERIC_WRITE, 0, NULL,
 270                        CREATE_ALWAYS, FILE_FLAG_BACKUP_SEMANTICS, NULL);
 271         if (h == INVALID_HANDLE_VALUE) {
 272                 win32_error(GetLastError(),
 273                             L"\"%ls\": Can't open file for writing", path);
 274                 return WIMLIB_ERR_OPEN;
 275         }
 276
 277         SetLastError(0);
 278         if (!WriteFile(h, contents, size, &bytes_written, NULL) ||
 279             bytes_written != size)
 280         {
 281                 win32_error(GetLastError(),
 282                             L"\"%ls\": Can't write file", path);
 283                 CloseHandle(h);
 284                 return WIMLIB_ERR_WRITE;
 285         }
 286
 287         if (!CloseHandle(h)) {
 288                 win32_error(GetLastError(),
 289                             L"\"%ls\": Can't close handle", path);
 290                 return WIMLIB_ERR_WRITE;
 291         }
 292
 293         return 0;
 294 }
 295
 296 /*
 297  * Generates the contents of WimOverlay.dat in memory, with one entry added.
 298  *
 299  * @buf
 300  *      Buffer large enough to hold the new contents.
 301  * @old_hdr
 302  *      Old contents of WimOverlay.dat, or NULL if it did not exist.
 303  * @wim_path
 304  *      Absolute path to the WIM file.  It must begin with a drive letter; for
 305  *      example, D:\install.wim.
 306  * @wim_guid
 307  *      GUID of the WIM, from the WIM header.
 308  * @image
 309  *      Number of the image in the WIM to specify in the new entry.
 310  * @new_data_source_id
 311  *      Data source ID to use for the new entry.
 312  * @part_info
 313  *      Partition information for the WIM file.
 314  * @disk_info
 315  *      Disk information for the WIM file.
 316  * @new_entry_2_size
 317  *      Size, in bytes, of the new location information structure ('struct
 318  *      WimOverlay_dat_entry_2').
 319  *
 320  * Returns a pointer one past the last byte of @buf filled in.
 321  */
 322 static u8 *
 323 fill_in_wimoverlay_dat(u8 *buf,
 324                        const struct WimOverlay_dat_header *old_hdr,
 325                        const wchar_t *wim_path,
 326                        const u8 wim_guid[GUID_SIZE],
 327                        int image,
 328                        u64 new_data_source_id,
 329                        const PARTITION_INFORMATION_EX *part_info,
 330                        const DRIVE_LAYOUT_INFORMATION_EX *disk_info,
 331                        u32 new_entry_2_size)
 332 {
 333         struct WimOverlay_dat_header *new_hdr;
 334         struct WimOverlay_dat_entry_1 *new_entry_1;
 335         struct WimOverlay_dat_entry_2 *new_entry_2;
 336         u32 entry_2_offset;
 337         u8 *p = buf;
 338
 339         new_hdr = (struct WimOverlay_dat_header *)p;
 340
 341         /* Fill in new header  */
 342         new_hdr->magic = WIMOVERLAY_DAT_MAGIC;
 343         new_hdr->wim_provider_version = WIM_PROVIDER_CURRENT_VERSION;
 344         new_hdr->unknown_0x08 = 0x00000028;
 345         new_hdr->num_entries = (old_hdr ? old_hdr->num_entries : 0) + 1;
 346         new_hdr->next_data_source_id = (old_hdr ? old_hdr->next_data_source_id : 0) + 1;
 347
 348         p += sizeof(struct WimOverlay_dat_header);
 349
 350         /* Copy WIM-specific information for old entries  */
 351         entry_2_offset = sizeof(struct WimOverlay_dat_header) +
 352                         (new_hdr->num_entries * sizeof(struct WimOverlay_dat_entry_1));
 353         if (old_hdr) {
 354                 for (u32 i = 0; i < old_hdr->num_entries; i++) {
 355                         new_entry_1 = (struct WimOverlay_dat_entry_1 *)p;
 356
 357                         p = mempcpy(p, &old_hdr->entry_1s[i],
 358                                     sizeof(struct WimOverlay_dat_entry_1));
 359
 360                         new_entry_1->entry_2_offset = entry_2_offset;
 361                         entry_2_offset += new_entry_1->entry_2_length;
 362                 }
 363         }
 364
 365         /* Generate WIM-specific information for new entry  */
 366         new_entry_1 = (struct WimOverlay_dat_entry_1 *)p;
 367
 368         new_entry_1->data_source_id = new_data_source_id;
 369         new_entry_1->entry_2_offset = entry_2_offset;
 370         new_entry_1->entry_2_length = new_entry_2_size;
 371         new_entry_1->wim_type = WIM_BOOT_NOT_OS_WIM;
 372         new_entry_1->wim_index = image;
 373         STATIC_ASSERT(sizeof(new_entry_1->guid) == GUID_SIZE);
 374         copy_guid(new_entry_1->guid, wim_guid);
 375
 376         p += sizeof(struct WimOverlay_dat_entry_1);
 377
 378         /* Copy WIM location information for old entries  */
 379         if (old_hdr) {
 380                 for (u32 i = 0; i < old_hdr->num_entries; i++) {
 381                         wimlib_assert(new_hdr->entry_1s[i].entry_2_offset == p - buf);
 382                         wimlib_assert(old_hdr->entry_1s[i].entry_2_length ==
 383                                       new_hdr->entry_1s[i].entry_2_length);
 384                         p = mempcpy(p,
 385                                     ((const u8 *)old_hdr + old_hdr->entry_1s[i].entry_2_offset),
 386                                     old_hdr->entry_1s[i].entry_2_length);
 387                 }
 388         }
 389
 390         /* Generate WIM location information for new entry  */
 391         new_entry_2 = (struct WimOverlay_dat_entry_2 *)p;
 392
 393         new_entry_2->unknown_0x00 = 0x00000000;
 394         new_entry_2->unknown_0x04 = 0x00000000;
 395         new_entry_2->entry_2_length = new_entry_2_size;
 396         new_entry_2->unknown_0x0C = 0x00000000;
 397         new_entry_2->unknown_0x10 = 0x00000005;
 398         new_entry_2->unknown_0x14 = 0x00000001;
 399         new_entry_2->inner_struct_size = new_entry_2_size - 0x14;
 400         new_entry_2->unknown_0x1C = 0x00000005;
 401         new_entry_2->unknown_0x20 = 0x00000006;
 402         new_entry_2->unknown_0x24 = 0x00000000;
 403         new_entry_2->unknown_0x28 = 0x00000048;
 404         new_entry_2->unknown_0x2C = 0x00000000;
 405         new_entry_2->unknown_0x40 = 0x00000000;
 406
 407         if (part_info->PartitionStyle == PARTITION_STYLE_MBR) {
 408                 new_entry_2->partition.mbr.part_start_offset = part_info->StartingOffset.QuadPart;
 409                 new_entry_2->partition.mbr.padding = 0;
 410                 new_entry_2->partition_table_type = WIMOVERLAY_PARTITION_TYPE_MBR;
 411                 new_entry_2->disk.mbr.disk_id = disk_info->Mbr.Signature;
 412                 new_entry_2->disk.mbr.padding[0] = 0x00000000;
 413                 new_entry_2->disk.mbr.padding[1] = 0x00000000;
 414                 new_entry_2->disk.mbr.padding[2] = 0x00000000;
 415         } else {
 416                 STATIC_ASSERT(sizeof(new_entry_2->partition.gpt.part_unique_guid) ==
 417                               sizeof(part_info->Gpt.PartitionId));
 418                 memcpy(new_entry_2->partition.gpt.part_unique_guid,
 419                        &part_info->Gpt.PartitionId,
 420                        sizeof(part_info->Gpt.PartitionId));
 421                 new_entry_2->partition_table_type = WIMOVERLAY_PARTITION_TYPE_GPT;
 422
 423                 STATIC_ASSERT(sizeof(new_entry_2->disk.gpt.disk_guid) ==
 424                               sizeof(disk_info->Gpt.DiskId));
 425                 memcpy(new_entry_2->disk.gpt.disk_guid,
 426                        &disk_info->Gpt.DiskId,
 427                        sizeof(disk_info->Gpt.DiskId));
 428
 429                 STATIC_ASSERT(sizeof(new_entry_2->disk.gpt.disk_guid) ==
 430                               sizeof(new_entry_2->partition.gpt.part_unique_guid));
 431         }
 432         new_entry_2->unknown_0x58[0] = 0x00000000;
 433         new_entry_2->unknown_0x58[1] = 0x00000000;
 434         new_entry_2->unknown_0x58[2] = 0x00000000;
 435         new_entry_2->unknown_0x58[3] = 0x00000000;
 436
 437         wimlib_assert(wim_path[2] == L'\\');
 438         return mempcpy(new_entry_2->wim_file_name,
 439                        wim_path + 2,
 440                        new_entry_2_size - sizeof(struct WimOverlay_dat_entry_2));
 441 }
 442
 443 /*
 444  * Prepares the new contents of WimOverlay.dat in memory, with one entry added.
 445  *
 446  * @old_hdr
 447  *      Old contents of WimOverlay.dat, or NULL if it did not exist.
 448  * @wim_path
 449  *      Absolute path to the WIM file.  It must begin with a drive letter; for
 450  *      example, D:\install.wim.
 451  * @wim_guid
 452  *      GUID of the WIM, from the WIM header.
 453  * @image
 454  *      Number of the image in the WIM to specify in the new entry.
 455  * @new_contents_ret
 456  *      Location into which to return the new contents as a malloc()ed buffer on
 457  *      success.
 458  * @new_contents_size_ret
 459  *      Location into which to return the size, in bytes, of the new contents on
 460  *      success.
 461  * @new_data_source_id_ret
 462  *      Location into which to return the data source ID of the new entry on
 463  *      success.
 464  *
 465  * Returns 0 on success, or a positive error code on failure.
 466  */
 467 static int
 468 prepare_wimoverlay_dat(const struct WimOverlay_dat_header *old_hdr,
 469                        const wchar_t *wim_path,
 470                        const u8 wim_guid[GUID_SIZE],
 471                        int image,
 472                        void **new_contents_ret,
 473                        u32 *new_contents_size_ret,
 474                        u64 *new_data_source_id_ret)
 475 {
 476         int ret;
 477         PARTITION_INFORMATION_EX part_info;
 478         DRIVE_LAYOUT_INFORMATION_EX disk_info;
 479         u64 new_data_source_id;
 480         u32 new_entry_2_size;
 481         u32 new_contents_size;
 482         u8 *buf;
 483         u8 *end;
 484
 485         ret = query_partition_and_disk_info(wim_path, &part_info, &disk_info);
 486         if (ret)
 487                 return ret;
 488
 489         new_data_source_id = old_hdr ? old_hdr->next_data_source_id : 0;
 490
 491         new_entry_2_size = sizeof(struct WimOverlay_dat_entry_2) +
 492                                 ((wcslen(wim_path) - 2 + 1) * sizeof(wchar_t));
 493         ret = calculate_wimoverlay_dat_size(old_hdr, new_entry_2_size,
 494                                             &new_contents_size);
 495         if (ret)
 496                 return ret;
 497
 498         buf = MALLOC(new_contents_size);
 499         if (!buf)
 500                 return WIMLIB_ERR_NOMEM;
 501
 502         end = fill_in_wimoverlay_dat(buf, old_hdr, wim_path, wim_guid, image,
 503                                      new_data_source_id,
 504                                      &part_info, &disk_info, new_entry_2_size);
 505
 506         wimlib_assert(end - buf == new_contents_size);
 507
 508         *new_contents_ret = buf;
 509         *new_contents_size_ret = new_contents_size;
 510         *new_data_source_id_ret = new_data_source_id;
 511         return 0;
 512 }
 513
 514 /*
 515  * Reads and validates a WimOverlay.dat file.
 516  *
 517  * @path
 518  *      Path to the WimOverlay.dat file, such as
 519  *      C:\System Volume Information\WimOverlay.dat
 520  * @contents_ret
 521  *      Location into which to return the contents as a malloc()ed buffer on
 522  *      success.  This can be cast to 'struct WimOverlay_dat_header', and its
 523  *      contents are guaranteed to be valid.  Alternatively, if the file does
 524  *      not exist, NULL will be returned here.
 525  *
 526  * Returns 0 on success, or a positive error code on failure.
 527  */
 528 static int
 529 read_wimoverlay_dat(const wchar_t *path, void **contents_ret)
 530 {
 531         HANDLE h;
 532         BY_HANDLE_FILE_INFORMATION info;
 533         int ret;
 534         void *contents;
 535         const struct WimOverlay_dat_header *hdr;
 536         DWORD bytes_read;
 537         bool already_retried = false;
 538
 539 retry:
 540         h = open_file(path, GENERIC_READ);
 541         if (h == INVALID_HANDLE_VALUE) {
 542                 DWORD err = GetLastError();
 543                 if (err == ERROR_FILE_NOT_FOUND) {
 544                         *contents_ret = NULL;
 545                         return 0;
 546                 }
 547                 if (err == ERROR_PATH_NOT_FOUND &&
 548                     func_RtlCreateSystemVolumeInformationFolder)
 549                 {
 550                         wchar_t volume_root_path[] = L"\\??\\X:\\";
 551
 552                         *(wcschr(volume_root_path, L'X')) = path[0];
 553
 554                         UNICODE_STRING str = {
 555                                 .Length = sizeof(volume_root_path) - sizeof(wchar_t),
 556                                 .MaximumLength = sizeof(volume_root_path),
 557                                 .Buffer = volume_root_path,
 558                         };
 559                         NTSTATUS status;
 560                         DWORD err2;
 561
 562                         status = (*func_RtlCreateSystemVolumeInformationFolder)(&str);
 563
 564                         err2 = RtlNtStatusToDosError(status);
 565                         if (err2 == ERROR_SUCCESS) {
 566                                 if (!already_retried) {
 567                                         already_retried = true;
 568                                         goto retry;
 569                                 }
 570                         } else {
 571                                 err = err2;
 572                         }
 573                 }
 574                 win32_error(err, L"\"%ls\": Can't open for reading", path);
 575                 return WIMLIB_ERR_OPEN;
 576         }
 577         if (!GetFileInformationByHandle(h, &info)) {
 578                 win32_error(GetLastError(), L"\"%ls\": Can't query metadata", path);
 579                 CloseHandle(h);
 580                 return WIMLIB_ERR_STAT;
 581         }
 582
 583         contents = NULL;
 584         if (!info.nFileSizeHigh)
 585                 contents = MALLOC(info.nFileSizeLow);
 586         if (!contents) {
 587                 ERROR("\"%ls\": File is too large to fit into memory", path);
 588                 CloseHandle(h);
 589                 return WIMLIB_ERR_NOMEM;
 590         }
 591
 592         SetLastError(0);
 593         if (!ReadFile(h, contents, info.nFileSizeLow, &bytes_read, NULL) ||
 594             bytes_read != info.nFileSizeLow)
 595         {
 596                 win32_error(GetLastError(), L"\"%ls\": Can't read data", path);
 597                 CloseHandle(h);
 598                 ret = WIMLIB_ERR_READ;
 599                 goto out_free_contents;
 600         }
 601
 602         CloseHandle(h);
 603
 604         if (info.nFileSizeLow < sizeof(struct WimOverlay_dat_header)) {
 605                 ERROR("\"%ls\": File is unexpectedly small (only %"PRIu32" bytes)",
 606                       path, (u32)info.nFileSizeLow);
 607                 ret = WIMLIB_ERR_UNSUPPORTED;
 608                 goto out_free_contents;
 609         }
 610
 611         hdr = (const struct WimOverlay_dat_header *)contents;
 612
 613         if (hdr->magic != WIMOVERLAY_DAT_MAGIC ||
 614             hdr->wim_provider_version != WIM_PROVIDER_CURRENT_VERSION ||
 615             hdr->unknown_0x08 != 0x00000028)
 616         {
 617                 ERROR("\"%ls\": Header contains unexpected data:", path);
 618                 if (wimlib_print_errors) {
 619                         print_byte_field((const u8 *)hdr,
 620                                          sizeof(struct WimOverlay_dat_header),
 621                                          wimlib_error_file);
 622                         fputc('\n', wimlib_error_file);
 623                 }
 624                 ret = WIMLIB_ERR_UNSUPPORTED;
 625                 goto out_free_contents;
 626         }
 627
 628         if ((u64)hdr->num_entries * sizeof(struct WimOverlay_dat_entry_1) >
 629             info.nFileSizeLow - sizeof(struct WimOverlay_dat_header))
 630         {
 631                 ERROR("\"%ls\": File is unexpectedly small "
 632                       "(only %"PRIu32" bytes, but has %"PRIu32" entries)",
 633                       path, (u32)info.nFileSizeLow, hdr->num_entries);
 634                 ret = WIMLIB_ERR_UNSUPPORTED;
 635                 goto out_free_contents;
 636         }
 637
 638         for (u32 i = 0; i < hdr->num_entries; i++) {
 639                 const struct WimOverlay_dat_entry_1 *entry_1;
 640                 const struct WimOverlay_dat_entry_2 *entry_2;
 641                 u32 wim_file_name_length;
 642
 643                 entry_1 = &hdr->entry_1s[i];
 644
 645                 if (entry_1->data_source_id >= hdr->next_data_source_id) {
 646                         ERROR("\"%ls\": value of next_data_source_id "
 647                               "(0x%016"PRIx64") is unexpected, since entry "
 648                               "%"PRIu32" has data source ID 0x%016"PRIx64,
 649                               path, hdr->next_data_source_id,
 650                               i, entry_1->data_source_id);
 651                         ret = WIMLIB_ERR_UNSUPPORTED;
 652                         goto out_free_contents;
 653                 }
 654
 655                 if (((u64)entry_1->entry_2_offset +
 656                      (u64)entry_1->entry_2_length) >
 657                     info.nFileSizeLow)
 658                 {
 659                         ERROR("\"%ls\": entry %"PRIu32" (2) "
 660                               "(data source ID 0x%016"PRIx64") "
 661                               "overflows file",
 662                               path, i, entry_1->data_source_id);
 663                         ret = WIMLIB_ERR_UNSUPPORTED;
 664                         goto out_free_contents;
 665                 }
 666                 if (entry_1->entry_2_length < sizeof(struct WimOverlay_dat_entry_2)) {
 667                         ERROR("\"%ls\": entry %"PRIu32" (2) "
 668                               "(data source ID 0x%016"PRIx64") "
 669                               "is too short",
 670                               path, i, entry_1->data_source_id);
 671                         ret = WIMLIB_ERR_UNSUPPORTED;
 672                         goto out_free_contents;
 673                 }
 674
 675                 if (entry_1->entry_2_offset % 2 != 0) {
 676                         ERROR("\"%ls\": entry %"PRIu32" (2) "
 677                               "(data source ID 0x%016"PRIx64") "
 678                               "is misaligned",
 679                               path, i, entry_1->data_source_id);
 680                         ret = WIMLIB_ERR_UNSUPPORTED;
 681                         goto out_free_contents;
 682                 }
 683
 684                 entry_2 = (const struct WimOverlay_dat_entry_2 *)
 685                                 ((const u8 *)hdr + entry_1->entry_2_offset);
 686
 687                 wim_file_name_length = entry_1->entry_2_length -
 688                                         sizeof(struct WimOverlay_dat_entry_2);
 689                 if ((wim_file_name_length < 2 * sizeof(wchar_t)) ||
 690                     (wim_file_name_length % sizeof(wchar_t) != 0) ||
 691                     (wmemchr(entry_2->wim_file_name, L'\0',
 692                              wim_file_name_length / sizeof(wchar_t))
 693                      != &entry_2->wim_file_name[wim_file_name_length /
 694                                                 sizeof(wchar_t) - 1]))
 695                 {
 696                         ERROR("\"%ls\": entry %"PRIu32" (2) "
 697                               "(data source ID 0x%016"PRIx64") "
 698                               "has invalid WIM file name",
 699                               path, i, entry_1->data_source_id);
 700                         if (wimlib_print_errors) {
 701                                 print_byte_field((const u8 *)entry_2->wim_file_name,
 702                                                  wim_file_name_length,
 703                                                  wimlib_error_file);
 704                                 fputc('\n', wimlib_error_file);
 705                         }
 706                         ret = WIMLIB_ERR_UNSUPPORTED;
 707                         goto out_free_contents;
 708                 }
 709
 710                 if (entry_2->unknown_0x00 != 0x00000000 ||
 711                     entry_2->unknown_0x04 != 0x00000000 ||
 712                     entry_2->unknown_0x0C != 0x00000000 ||
 713                     entry_2->entry_2_length != entry_1->entry_2_length ||
 714                     entry_2->unknown_0x10 != 0x00000005 ||
 715                     entry_2->unknown_0x14 != 0x00000001 ||
 716                     entry_2->inner_struct_size != entry_1->entry_2_length - 0x14 ||
 717                     entry_2->unknown_0x1C != 0x00000005 ||
 718                     entry_2->unknown_0x20 != 0x00000006 ||
 719                     entry_2->unknown_0x24 != 0x00000000 ||
 720                     entry_2->unknown_0x28 != 0x00000048 ||
 721                     entry_2->unknown_0x2C != 0x00000000 ||
 722                     entry_2->unknown_0x40 != 0x00000000 ||
 723                     (entry_2->partition_table_type != WIMOVERLAY_PARTITION_TYPE_GPT &&
 724                      entry_2->partition_table_type != WIMOVERLAY_PARTITION_TYPE_MBR) ||
 725                     (entry_2->partition_table_type == WIMOVERLAY_PARTITION_TYPE_MBR &&
 726                      entry_2->partition.mbr.padding != 0) ||
 727                     (entry_2->partition_table_type == WIMOVERLAY_PARTITION_TYPE_GPT &&
 728                      entry_2->partition.mbr.padding == 0) ||
 729                     entry_2->unknown_0x58[0] != 0x00000000 ||
 730                     entry_2->unknown_0x58[1] != 0x00000000 ||
 731                     entry_2->unknown_0x58[2] != 0x00000000 ||
 732                     entry_2->unknown_0x58[3] != 0x00000000)
 733                 {
 734                         ERROR("\"%ls\": entry %"PRIu32" (2) "
 735                               "(data source ID 0x%016"PRIx64") "
 736                               "contains unexpected data!",
 737                               path, i, entry_1->data_source_id);
 738                         if (wimlib_print_errors) {
 739                                 print_byte_field((const u8 *)entry_2,
 740                                                  entry_1->entry_2_length,
 741                                                  wimlib_error_file);
 742                                 fputc('\n', wimlib_error_file);
 743                         }
 744                         ret = WIMLIB_ERR_UNSUPPORTED;
 745                         goto out_free_contents;
 746                 }
 747         }
 748
 749         *contents_ret = contents;
 750         return 0;
 751
 752 out_free_contents:
 753         FREE(contents);
 754         return ret;
 755 }
 756
 757 /*
 758  * Update WimOverlay.dat manually in order to add a WIM data source to the
 759  * target volume.
 760  *
 761  * THIS CODE IS EXPERIMENTAL AS I HAD TO REVERSE ENGINEER THE FILE FORMAT!
 762  *
 763  * @path
 764  *      Target drive.  Must be a letter followed by a colon (e.g. D:).
 765  * @wim_path
 766  *      Absolute path to the WIM file.  It must begin with a drive letter; for
 767  *      example, D:\install.wim.
 768  * @wim_guid
 769  *      GUID of the WIM, from the WIM header.
 770  * @image
 771  *      Number of the image in the WIM to specify in the new entry.
 772  * @data_source_id_ret
 773  *      On success, the allocated data source ID is returned here.
 774  */
 775 static int
 776 update_wimoverlay_manually(const wchar_t *drive, const wchar_t *wim_path,
 777                            const u8 wim_guid[GUID_SIZE],
 778                            int image, u64 *data_source_id_ret)
 779 {
 780         wchar_t path_main[] = L"A:\\System Volume Information\\WimOverlay.dat";
 781         wchar_t path_backup[] = L"A:\\System Volume Information\\WimOverlay.backup";
 782         wchar_t path_wimlib_backup[] = L"A:\\System Volume Information\\WimOverlay.wimlib_backup";
 783         wchar_t path_new[] = L"A:\\System Volume Information\\WimOverlay.wimlib_new";
 784         void *old_contents = NULL;
 785         void *new_contents = NULL;
 786         u32 new_contents_size = 0;
 787         u64 new_data_source_id = -1;
 788         int ret;
 789
 790         wimlib_assert(drive[0] != L'\0' &&
 791                       drive[1] == L':' &&
 792                       drive[2] == L'\0');
 793
 794         path_main[0]          = drive[0];
 795         path_backup[0]        = drive[0];
 796         path_wimlib_backup[0] = drive[0];
 797         path_new[0]           = drive[0];
 798
 799         ret = read_wimoverlay_dat(path_main, &old_contents);
 800         if (ret)
 801                 goto out;
 802
 803         ret = prepare_wimoverlay_dat(old_contents, wim_path, wim_guid, image,
 804                                      &new_contents, &new_contents_size,
 805                                      &new_data_source_id);
 806         FREE(old_contents);
 807         if (ret)
 808                 goto out;
 809
 810         /* Write WimOverlay.wimlib_new  */
 811         ret = write_wimoverlay_dat(path_new,
 812                                    new_contents, new_contents_size);
 813         if (ret)
 814                 goto out_free_new_contents;
 815
 816         /* Write WimOverlay.backup  */
 817         ret = write_wimoverlay_dat(path_backup,
 818                                    new_contents, new_contents_size);
 819         if (ret)
 820                 goto out_free_new_contents;
 821
 822         if (old_contents) {
 823                 /* Rename WimOverlay.dat => WimOverlay.wimlib_backup  */
 824                 ret = win32_rename_replacement(path_main, path_wimlib_backup);
 825                 if (ret) {
 826                         ERROR_WITH_ERRNO("Can't rename \"%ls\" => \"%ls\"",
 827                                          path_main, path_wimlib_backup);
 828                         ret = WIMLIB_ERR_RENAME;
 829                         goto out_free_new_contents;
 830                 }
 831         }
 832
 833         /* Rename WimOverlay.wimlib_new => WimOverlay.dat  */
 834         ret = win32_rename_replacement(path_new, path_main);
 835         if (ret) {
 836                 ERROR_WITH_ERRNO("Can't rename \"%ls\" => \"%ls\"",
 837                                  path_new, path_main);
 838                 ret = WIMLIB_ERR_RENAME;
 839         }
 840 out_free_new_contents:
 841         FREE(new_contents);
 842 out:
 843         if (ret == WIMLIB_ERR_UNSUPPORTED) {
 844                 ERROR("Please report to developer ("PACKAGE_BUGREPORT").\n"
 845                       "        If possible send the file \"%ls\".\n\n", path_main);
 846         }
 847         if (ret == 0)
 848                 *data_source_id_ret = new_data_source_id;
 849         return ret;
 850 }
 851
 852 /*
 853  * Allocate a WOF data source ID for a WIM file.
 854  *
 855  * @wim_path
 856  *      Absolute path to the WIM file.  This must include a drive letter and use
 857  *      backslash path separators.
 858  * @wim_guid
 859  *      GUID of the WIM, from the WIM header.
 860  * @image
 861  *      Number of the image in the WIM being applied.
 862  * @target
 863  *      Path to the target directory.
 864  * @data_source_id_ret
 865  *      On success, an identifier for the backing WIM file will be returned
 866  *      here.
 867  *
 868  * Returns 0 on success, or a positive error code on failure.
 869  */
 870 int
 871 wimboot_alloc_data_source_id(const wchar_t *wim_path,
 872                              const u8 wim_guid[GUID_SIZE],
 873                              int image, const wchar_t *target,
 874                              u64 *data_source_id_ret, bool *wof_running_ret)
 875 {
 876         tchar drive_path[7];
 877         size_t wim_path_nchars;
 878         size_t wim_file_name_length;
 879         void *in;
 880         size_t insize;
 881         struct wof_external_info *wof_info;
 882         struct wim_provider_add_overlay_input *wim_info;
 883         HANDLE h;
 884         u64 data_source_id;
 885         DWORD bytes_returned;
 886         int ret;
 887         const wchar_t *prefix = L"\\??\\";
 888         const size_t prefix_nchars = 4;
 889         bool tried_to_attach_wof = false;
 890
 891         ret = win32_get_drive_path(target, drive_path);
 892         if (ret)
 893                 return ret;
 894
 895         wimlib_assert(!wcschr(wim_path, L'/'));
 896         wimlib_assert(wim_path[0] != L'\0' && wim_path[1] == L':');
 897
 898         wim_path_nchars = wcslen(wim_path);
 899         wim_file_name_length = sizeof(wchar_t) *
 900                                (wim_path_nchars + prefix_nchars);
 901
 902         insize = sizeof(struct wof_external_info) +
 903                  sizeof(struct wim_provider_add_overlay_input) +
 904                  wim_file_name_length;
 905
 906         in = MALLOC(insize);
 907         if (!in) {
 908                 ret = WIMLIB_ERR_NOMEM;
 909                 goto out;
 910         }
 911
 912         wof_info = (struct wof_external_info *)in;
 913         wof_info->version = WOF_CURRENT_VERSION;
 914         wof_info->provider = WOF_PROVIDER_WIM;
 915
 916         wim_info = (struct wim_provider_add_overlay_input *)(wof_info + 1);
 917         wim_info->wim_type = WIM_BOOT_NOT_OS_WIM;
 918         wim_info->wim_index = image;
 919         wim_info->wim_file_name_offset = offsetof(struct wim_provider_add_overlay_input,
 920                                                   wim_file_name);
 921         wim_info->wim_file_name_length = wim_file_name_length;
 922         wmemcpy(&wim_info->wim_file_name[0], prefix, prefix_nchars);
 923         wmemcpy(&wim_info->wim_file_name[prefix_nchars], wim_path, wim_path_nchars);
 924
 925 retry_ioctl:
 926         h = open_file(drive_path, GENERIC_WRITE);
 927
 928         if (h == INVALID_HANDLE_VALUE) {
 929                 win32_error(GetLastError(),
 930                             L"Failed to open \"%ls\"", drive_path + 4);
 931                 ret = WIMLIB_ERR_OPEN;
 932                 goto out_free_in;
 933         }
 934
 935         if (!DeviceIoControl(h, FSCTL_ADD_OVERLAY,
 936                              in, insize,
 937                              &data_source_id, sizeof(data_source_id),
 938                              &bytes_returned, NULL))
 939         {
 940                 DWORD err = GetLastError();
 941                 if (err == ERROR_INVALID_FUNCTION) {
 942                         if (!tried_to_attach_wof) {
 943                                 CloseHandle(h);
 944                                 h = INVALID_HANDLE_VALUE;
 945                                 tried_to_attach_wof = true;
 946                                 if (win32_try_to_attach_wof(drive_path + 4))
 947                                         goto retry_ioctl;
 948                         }
 949                         ret = WIMLIB_ERR_UNSUPPORTED;
 950                         goto out_close_handle;
 951                 } else {
 952                         win32_error(err, L"Failed to add overlay source \"%ls\" "
 953                                     "to volume \"%ls\"", wim_path, drive_path + 4);
 954                         ret = WIMLIB_ERR_WIMBOOT;
 955                         goto out_close_handle;
 956                 }
 957         }
 958
 959         if (bytes_returned != sizeof(data_source_id)) {
 960                 ret = WIMLIB_ERR_WIMBOOT;
 961                 ERROR("Unexpected result size when adding "
 962                       "overlay source \"%ls\" to volume \"%ls\"",
 963                       wim_path, drive_path + 4);
 964                 goto out_close_handle;
 965         }
 966
 967         *wof_running_ret = true;
 968         *data_source_id_ret = data_source_id;
 969         ret = 0;
 970
 971 out_close_handle:
 972         CloseHandle(h);
 973 out_free_in:
 974         FREE(in);
 975 out:
 976         if (ret == WIMLIB_ERR_UNSUPPORTED) {
 977                 WARNING("WOF driver is not available; updating WimOverlay.dat directly.");
 978                 ret = update_wimoverlay_manually(drive_path + 4, wim_path,
 979                                                  wim_guid, image,
 980                                                  data_source_id_ret);
 981                 *wof_running_ret = false;
 982         }
 983         return ret;
 984 }
 985
 986
 987 /*
 988  * Set WIMBoot information on the specified file.
 989  *
 990  * This turns it into a reparse point that redirects accesses to it, to the
 991  * corresponding resource in the WIM archive.
 992  *
 993  * @h
 994  *      Open handle to the file, with GENERIC_WRITE access.
 995  * @blob
 996  *      The blob for the unnamed data stream of the file.
 997  * @data_source_id
 998  *      Allocated identifier for the WIM data source on the destination volume.
 999  * @blob_table_hash
1000  *      SHA-1 message digest of the WIM's blob table.
1001  * @wof_running
1002  *      %true if the WOF driver appears to be available and working; %false if
1003  *      not.
1004  *
1005  * Returns %true on success, or %false on failure with GetLastError() set.
1006  */
1007 bool
1008 wimboot_set_pointer(HANDLE h,
1009                     const struct blob_descriptor *blob,
1010                     u64 data_source_id,
1011                     const u8 blob_table_hash[SHA1_HASH_SIZE],
1012                     bool wof_running)
1013 {
1014         DWORD bytes_returned;
1015
1016         if (wof_running) {
1017                 /* The WOF driver is running.  We can create the reparse point
1018                  * using FSCTL_SET_EXTERNAL_BACKING.  */
1019                 unsigned int max_retries = 4;
1020                 struct {
1021                         struct wof_external_info wof_info;
1022                         struct wim_provider_external_info wim_info;
1023                 } in;
1024
1025         retry:
1026                 memset(&in, 0, sizeof(in));
1027
1028                 in.wof_info.version = WOF_CURRENT_VERSION;
1029                 in.wof_info.provider = WOF_PROVIDER_WIM;
1030
1031                 in.wim_info.version = WIM_PROVIDER_CURRENT_VERSION;
1032                 in.wim_info.flags = 0;
1033                 in.wim_info.data_source_id = data_source_id;
1034                 copy_hash(in.wim_info.unnamed_data_stream_hash, blob->hash);
1035
1036                 /* blob_table_hash is not necessary  */
1037
1038                 if (!DeviceIoControl(h, FSCTL_SET_EXTERNAL_BACKING,
1039                                      &in, sizeof(in), NULL, 0,
1040                                      &bytes_returned, NULL))
1041                 {
1042                         /* Try to track down sporadic errors  */
1043                         if (wimlib_print_errors) {
1044                                 WARNING("FSCTL_SET_EXTERNAL_BACKING failed (err=%u); data was %zu bytes:",
1045                                         (u32)GetLastError(), sizeof(in));
1046                                 print_byte_field((const u8 *)&in, sizeof(in), wimlib_error_file);
1047                                 putc('\n', wimlib_error_file);
1048                         }
1049                         if (--max_retries) {
1050                                 WARNING("Retrying after 100ms...");
1051                                 Sleep(100);
1052                                 goto retry;
1053                         }
1054                         WARNING("Too many retries; returning failure");
1055                         return false;
1056                 }
1057         } else {
1058
1059                 /* The WOF driver is running.  We need to create the reparse
1060                  * point manually.  */
1061
1062                 struct {
1063                         struct {
1064                                 le32 rptag;
1065                                 le16 rpdatalen;
1066                                 le16 rpreserved;
1067                         } hdr;
1068                         struct wof_external_info wof_info;
1069                         struct wim_provider_rpdata wim_info;
1070                 } in;
1071
1072                 STATIC_ASSERT(sizeof(in) == 8 +
1073                               sizeof(struct wof_external_info) +
1074                               sizeof(struct wim_provider_rpdata));
1075
1076                 in.hdr.rptag = WIM_IO_REPARSE_TAG_WOF;
1077                 in.hdr.rpdatalen = sizeof(in) - sizeof(in.hdr);
1078                 in.hdr.rpreserved = 0;
1079
1080                 in.wof_info.version = WOF_CURRENT_VERSION;
1081                 in.wof_info.provider = WOF_PROVIDER_WIM;
1082
1083                 in.wim_info.version = 2;
1084                 in.wim_info.flags = 0;
1085                 in.wim_info.data_source_id = data_source_id;
1086                 copy_hash(in.wim_info.unnamed_data_stream_hash, blob->hash);
1087                 copy_hash(in.wim_info.blob_table_hash, blob_table_hash);
1088                 in.wim_info.unnamed_data_stream_size = blob->size;
1089                 in.wim_info.unnamed_data_stream_size_in_wim = blob->rdesc->size_in_wim;
1090                 in.wim_info.unnamed_data_stream_offset_in_wim = blob->rdesc->offset_in_wim;
1091
1092                 if (!DeviceIoControl(h, FSCTL_SET_REPARSE_POINT,
1093                                      &in, sizeof(in), NULL, 0, &bytes_returned, NULL))
1094                         return false;
1095
1096                 /* We also need to create an unnamed data stream of the correct
1097                  * size.  Otherwise the file shows up as zero length.  It can be
1098                  * a sparse stream containing all zeroes; its contents
1099                  * are unimportant.  */
1100                 if (!DeviceIoControl(h, FSCTL_SET_SPARSE, NULL, 0, NULL, 0,
1101                                      &bytes_returned, NULL))
1102                         return false;
1103
1104                 if (!SetFilePointerEx(h,
1105                                       (LARGE_INTEGER){ .QuadPart = blob->size},
1106                                       NULL, FILE_BEGIN))
1107                         return false;
1108
1109                 if (!SetEndOfFile(h))
1110                         return false;
1111         }
1112
1113         return true;
1114 }
1115
1116 #endif /* __WIN32__ */