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   1 /*
   2  * win32_capture.c - Windows-specific code for capturing files into a WIM image.
   3  */
   4
   5 /*
   6  * Copyright (C) 2013, 2014 Eric Biggers
   7  *
   8  * This file is part of wimlib, a library for working with WIM files.
   9  *
  10  * wimlib is free software; you can redistribute it and/or modify it under the
  11  * terms of the GNU General Public License as published by the Free
  12  * Software Foundation; either version 3 of the License, or (at your option)
  13  * any later version.
  14  *
  15  * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
  16  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  17  * A PARTICULAR PURPOSE. See the GNU General Public License for more
  18  * details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  22  */
  23
  24 #ifdef __WIN32__
  25
  26 #ifdef HAVE_CONFIG_H
  27 #  include "config.h"
  28 #endif
  29
  30 #include "wimlib/win32_common.h"
  31
  32 #include "wimlib/capture.h"
  33 #include "wimlib/dentry.h"
  34 #include "wimlib/encoding.h"
  35 #include "wimlib/endianness.h"
  36 #include "wimlib/error.h"
  37 #include "wimlib/lookup_table.h"
  38 #include "wimlib/paths.h"
  39 #include "wimlib/reparse.h"
  40
  41 #include <errno.h>
  42
  43 struct win32_capture_state {
  44         unsigned long num_get_sd_access_denied;
  45         unsigned long num_get_sacl_priv_notheld;
  46         unsigned long num_long_path_warnings;
  47 };
  48
  49 static NTSTATUS
  50 winnt_openat(HANDLE cur_dir, const wchar_t *path, size_t path_nchars,
  51              ACCESS_MASK perms, HANDLE *h_ret)
  52 {
  53         UNICODE_STRING name;
  54         OBJECT_ATTRIBUTES attr;
  55         IO_STATUS_BLOCK iosb;
  56         NTSTATUS status;
  57
  58         name.Length = path_nchars * sizeof(wchar_t);
  59         name.MaximumLength = name.Length + sizeof(wchar_t);
  60         name.Buffer = (wchar_t *)path;
  61
  62         attr.Length = sizeof(attr);
  63         attr.RootDirectory = cur_dir;
  64         attr.ObjectName = &name;
  65         attr.Attributes = 0;
  66         attr.SecurityDescriptor = NULL;
  67         attr.SecurityQualityOfService = NULL;
  68
  69 retry:
  70         status = (*func_NtOpenFile)(h_ret, perms, &attr, &iosb,
  71                                     FILE_SHARE_READ |
  72                                             FILE_SHARE_WRITE |
  73                                             FILE_SHARE_DELETE,
  74                                     FILE_OPEN_REPARSE_POINT |
  75                                             FILE_OPEN_FOR_BACKUP_INTENT |
  76                                             FILE_SYNCHRONOUS_IO_NONALERT);
  77         if (!NT_SUCCESS(status)) {
  78                 if (status == STATUS_ACCESS_DENIED ||
  79                     status == STATUS_PRIVILEGE_NOT_HELD) {
  80                         if (perms & ACCESS_SYSTEM_SECURITY) {
  81                                 perms &= ~ACCESS_SYSTEM_SECURITY;
  82                                 goto retry;
  83                         }
  84                         if (perms & READ_CONTROL) {
  85                                 perms &= ~READ_CONTROL;
  86                                 goto retry;
  87                         }
  88                 }
  89         }
  90         return status;
  91 }
  92
  93 int
  94 read_win32_file_prefix(const struct wim_lookup_table_entry *lte,
  95                        u64 size,
  96                        consume_data_callback_t cb,
  97                        void *cb_ctx)
  98 {
  99         const wchar_t *path;
 100         HANDLE h;
 101         NTSTATUS status;
 102         u8 buf[BUFFER_SIZE];
 103         u64 bytes_remaining;
 104         int ret;
 105
 106         path = lte->file_on_disk;
 107         status = winnt_openat(NULL, path, wcslen(path),
 108                               FILE_READ_DATA | SYNCHRONIZE, &h);
 109         if (!NT_SUCCESS(status)) {
 110                 set_errno_from_nt_status(status);
 111                 ERROR_WITH_ERRNO("\"%ls\": Can't open for reading", path);
 112                 return WIMLIB_ERR_OPEN;
 113         }
 114
 115         ret = 0;
 116         bytes_remaining = size;
 117         while (bytes_remaining) {
 118                 IO_STATUS_BLOCK iosb;
 119                 ULONG count;
 120
 121                 count = min(sizeof(buf), bytes_remaining);
 122
 123                 status = (*func_NtReadFile)(h, NULL, NULL, NULL,
 124                                             &iosb, buf, count, NULL, NULL);
 125                 if (!NT_SUCCESS(status) || iosb.Information != count) {
 126                         set_errno_from_nt_status(status);
 127                         ERROR_WITH_ERRNO("\"%ls\": Error reading data", path);
 128                         ret = WIMLIB_ERR_READ;
 129                         break;
 130                 }
 131
 132                 bytes_remaining -= count;
 133                 ret = (*cb)(buf, count, cb_ctx);
 134                 if (ret)
 135                         break;
 136         }
 137         (*func_NtClose)(h);
 138         return ret;
 139 }
 140
 141 struct win32_encrypted_read_ctx {
 142         consume_data_callback_t read_prefix_cb;
 143         void *read_prefix_ctx;
 144         int wimlib_err_code;
 145         u64 bytes_remaining;
 146 };
 147
 148 static DWORD WINAPI
 149 win32_encrypted_export_cb(unsigned char *data, void *_ctx, unsigned long len)
 150 {
 151         struct win32_encrypted_read_ctx *ctx = _ctx;
 152         int ret;
 153         size_t bytes_to_consume = min(len, ctx->bytes_remaining);
 154
 155         if (bytes_to_consume == 0)
 156                 return ERROR_SUCCESS;
 157
 158         ret = (*ctx->read_prefix_cb)(data, bytes_to_consume, ctx->read_prefix_ctx);
 159         if (ret) {
 160                 ctx->wimlib_err_code = ret;
 161                 /* Shouldn't matter what error code is returned here, as long as
 162                  * it isn't ERROR_SUCCESS.  */
 163                 return ERROR_READ_FAULT;
 164         }
 165         ctx->bytes_remaining -= bytes_to_consume;
 166         return ERROR_SUCCESS;
 167 }
 168
 169 int
 170 read_win32_encrypted_file_prefix(const struct wim_lookup_table_entry *lte,
 171                                  u64 size,
 172                                  consume_data_callback_t cb,
 173                                  void *cb_ctx)
 174 {
 175         struct win32_encrypted_read_ctx export_ctx;
 176         DWORD err;
 177         void *file_ctx;
 178         int ret;
 179
 180         DEBUG("Reading %"PRIu64" bytes from encrypted file \"%ls\"",
 181               size, lte->file_on_disk);
 182
 183         export_ctx.read_prefix_cb = cb;
 184         export_ctx.read_prefix_ctx = cb_ctx;
 185         export_ctx.wimlib_err_code = 0;
 186         export_ctx.bytes_remaining = size;
 187
 188         err = OpenEncryptedFileRaw(lte->file_on_disk, 0, &file_ctx);
 189         if (err != ERROR_SUCCESS) {
 190                 set_errno_from_win32_error(err);
 191                 ERROR_WITH_ERRNO("Failed to open encrypted file \"%ls\" "
 192                                  "for raw read", lte->file_on_disk);
 193                 return WIMLIB_ERR_OPEN;
 194         }
 195         err = ReadEncryptedFileRaw(win32_encrypted_export_cb,
 196                                    &export_ctx, file_ctx);
 197         if (err != ERROR_SUCCESS) {
 198                 set_errno_from_win32_error(err);
 199                 ERROR_WITH_ERRNO("Failed to read encrypted file \"%ls\"",
 200                                  lte->file_on_disk);
 201                 ret = export_ctx.wimlib_err_code;
 202                 if (ret == 0)
 203                         ret = WIMLIB_ERR_READ;
 204         } else if (export_ctx.bytes_remaining != 0) {
 205                 ERROR("Only could read %"PRIu64" of %"PRIu64" bytes from "
 206                       "encryted file \"%ls\"",
 207                       size - export_ctx.bytes_remaining, size,
 208                       lte->file_on_disk);
 209                 ret = WIMLIB_ERR_READ;
 210         } else {
 211                 ret = 0;
 212         }
 213         CloseEncryptedFileRaw(file_ctx);
 214         return ret;
 215 }
 216
 217 /* Load the short name of a file into a WIM dentry.
 218  *
 219  * If we can't read the short filename for some reason, we just ignore the error
 220  * and assume the file has no short name.  This shouldn't be an issue, since the
 221  * short names are essentially obsolete anyway.
 222  */
 223 static int
 224 win32_get_short_name(HANDLE hFile, struct wim_dentry *dentry)
 225 {
 226
 227         /* It's not any harder to just make the NtQueryInformationFile() system
 228          * call ourselves, and it saves a dumb call to FindFirstFile() which of
 229          * course has to create its own handle.  */
 230         NTSTATUS status;
 231         IO_STATUS_BLOCK io_status;
 232         u8 buf[128] _aligned_attribute(8);
 233         const FILE_NAME_INFORMATION *info;
 234
 235         status = (*func_NtQueryInformationFile)(hFile, &io_status, buf, sizeof(buf),
 236                                                 FileAlternateNameInformation);
 237         info = (const FILE_NAME_INFORMATION*)buf;
 238         if (NT_SUCCESS(status) && info->FileNameLength != 0) {
 239                 dentry->short_name = utf16le_dupz(info->FileName,
 240                                                   info->FileNameLength);
 241                 if (!dentry->short_name)
 242                         return WIMLIB_ERR_NOMEM;
 243                 dentry->short_name_nbytes = info->FileNameLength;
 244         }
 245         return 0;
 246 }
 247
 248 static int
 249 win32_get_security_descriptor(HANDLE h,
 250                               struct wim_inode *inode,
 251                               struct wim_sd_set *sd_set,
 252                               struct win32_capture_state *state,
 253                               int add_flags)
 254 {
 255         SECURITY_INFORMATION requestedInformation;
 256         u8 _buf[4096];
 257         u8 *buf;
 258         size_t bufsize;
 259         DWORD lenNeeded;
 260         NTSTATUS status;
 261         int ret;
 262
 263         requestedInformation = DACL_SECURITY_INFORMATION |
 264                                SACL_SECURITY_INFORMATION |
 265                                OWNER_SECURITY_INFORMATION |
 266                                GROUP_SECURITY_INFORMATION;
 267         buf = _buf;
 268         bufsize = sizeof(_buf);
 269
 270         /*
 271          * We need the file's security descriptor in SECURITY_DESCRIPTOR_RELATIVE
 272          * format, and we currently have a handle opened with as many relevant
 273          * permissions as possible.  At this point, on Windows there are a number of
 274          * options for reading a file's security descriptor:
 275          *
 276          * GetFileSecurity():  This takes in a path and returns the
 277          * SECURITY_DESCRIPTOR_RELATIVE.  Problem: this uses an internal handle, not
 278          * ours, and the handle created internally doesn't specify
 279          * FILE_FLAG_BACKUP_SEMANTICS.  Therefore there can be access denied errors on
 280          * some files and directories, even when running as the Administrator.
 281          *
 282          * GetSecurityInfo():  This takes in a handle and returns the security
 283          * descriptor split into a bunch of different parts.  This should work, but it's
 284          * dumb because we have to put the security descriptor back together again.
 285          *
 286          * BackupRead():  This can read the security descriptor, but this is a
 287          * difficult-to-use API, probably only works as the Administrator, and the
 288          * format of the returned data is not well documented.
 289          *
 290          * NtQuerySecurityObject():  This is exactly what we need, as it takes in a
 291          * handle and returns the security descriptor in SECURITY_DESCRIPTOR_RELATIVE
 292          * format.  Only problem is that it's a ntdll function and therefore not
 293          * officially part of the Win32 API.  Oh well.
 294          */
 295         while (!(NT_SUCCESS(status = (*func_NtQuerySecurityObject)(h,
 296                                                                    requestedInformation,
 297                                                                    (PSECURITY_DESCRIPTOR)buf,
 298                                                                    bufsize,
 299                                                                    &lenNeeded))))
 300         {
 301                 switch (status) {
 302                 case STATUS_BUFFER_TOO_SMALL:
 303                         wimlib_assert(buf == _buf);
 304                         buf = MALLOC(lenNeeded);
 305                         if (!buf)
 306                                 return WIMLIB_ERR_NOMEM;
 307                         bufsize = lenNeeded;
 308                         break;
 309                 case STATUS_PRIVILEGE_NOT_HELD:
 310                 case STATUS_ACCESS_DENIED:
 311                         if (add_flags & WIMLIB_ADD_FLAG_STRICT_ACLS) {
 312                 default:
 313                                 set_errno_from_nt_status(status);
 314                                 ret = WIMLIB_ERR_READ;
 315                                 goto out_free_buf;
 316                         }
 317                         if (requestedInformation & SACL_SECURITY_INFORMATION) {
 318                                 state->num_get_sacl_priv_notheld++;
 319                                 requestedInformation &= ~SACL_SECURITY_INFORMATION;
 320                                 break;
 321                         }
 322                         state->num_get_sd_access_denied++;
 323                         ret = 0;
 324                         goto out_free_buf;
 325                 }
 326         }
 327
 328         inode->i_security_id = sd_set_add_sd(sd_set, buf, lenNeeded);
 329         if (inode->i_security_id < 0)
 330                 ret = WIMLIB_ERR_NOMEM;
 331         else
 332                 ret = 0;
 333 out_free_buf:
 334         if (buf != _buf)
 335                 FREE(buf);
 336         return ret;
 337 }
 338
 339 static int
 340 win32_build_dentry_tree_recursive(struct wim_dentry **root_ret,
 341                                   HANDLE cur_dir,
 342                                   wchar_t *full_path,
 343                                   size_t full_path_nchars,
 344                                   const wchar_t *filename,
 345                                   size_t filename_nchars,
 346                                   struct add_image_params *params,
 347                                   struct win32_capture_state *state,
 348                                   DWORD vol_flags);
 349
 350 /* Reads the directory entries of directory and recursively calls
 351  * win32_build_dentry_tree() on them.  */
 352 static int
 353 win32_recurse_directory(HANDLE h,
 354                         wchar_t *full_path,
 355                         size_t full_path_nchars,
 356                         struct wim_dentry *root,
 357                         struct add_image_params *params,
 358                         struct win32_capture_state *state,
 359                         DWORD vol_flags)
 360 {
 361         int ret;
 362
 363         /* Using NtQueryDirectoryFile() we can re-use the same open handle,
 364          * which we opened with FILE_FLAG_BACKUP_SEMANTICS.  */
 365
 366         NTSTATUS status;
 367         IO_STATUS_BLOCK io_status;
 368         const size_t bufsize = 8192;
 369         void *buf;
 370
 371         buf = MALLOC(bufsize);
 372         if (!buf)
 373                 return WIMLIB_ERR_NOMEM;
 374
 375         while (NT_SUCCESS(status = (*func_NtQueryDirectoryFile)(h, NULL, NULL, NULL,
 376                                                                 &io_status, buf, bufsize,
 377                                                                 FileNamesInformation,
 378                                                                 FALSE, NULL, FALSE)))
 379         {
 380                 const FILE_NAMES_INFORMATION *info = buf;
 381                 for (;;) {
 382                         if (!(info->FileNameLength == 2 && info->FileName[0] == L'.') &&
 383                             !(info->FileNameLength == 4 && info->FileName[0] == L'.' &&
 384                                                            info->FileName[1] == L'.'))
 385                         {
 386                                 wchar_t *p;
 387                                 struct wim_dentry *child;
 388
 389                                 p = full_path + full_path_nchars;
 390                                 *p++ = L'\\';
 391                                 p = wmempcpy(p, info->FileName,
 392                                              info->FileNameLength / 2);
 393                                 *p = '\0';
 394
 395                                 ret = win32_build_dentry_tree_recursive(
 396                                                                 &child,
 397                                                                 h,
 398                                                                 full_path,
 399                                                                 p - full_path,
 400                                                                 full_path + full_path_nchars + 1,
 401                                                                 info->FileNameLength / 2,
 402                                                                 params,
 403                                                                 state,
 404                                                                 vol_flags);
 405
 406                                 full_path[full_path_nchars] = L'\0';
 407
 408                                 if (ret)
 409                                         goto out_free_buf;
 410                                 if (child)
 411                                         dentry_add_child(root, child);
 412                         }
 413                         if (info->NextEntryOffset == 0)
 414                                 break;
 415                         info = (const FILE_NAMES_INFORMATION *)
 416                                         ((const u8 *)info + info->NextEntryOffset);
 417                 }
 418         }
 419
 420         if (status != STATUS_NO_MORE_FILES) {
 421                 set_errno_from_nt_status(status);
 422                 ERROR_WITH_ERRNO("\"%ls\": Can't read directory", full_path);
 423                 ret = WIMLIB_ERR_READ;
 424         }
 425 out_free_buf:
 426         FREE(buf);
 427         return ret;
 428 }
 429
 430 /* Reparse point fixup status code */
 431 enum rp_status {
 432         /* Reparse point corresponded to an absolute symbolic link or junction
 433          * point that pointed outside the directory tree being captured, and
 434          * therefore was excluded. */
 435         RP_EXCLUDED       = 0x0,
 436
 437         /* Reparse point was not fixed as it was either a relative symbolic
 438          * link, a mount point, or something else we could not understand. */
 439         RP_NOT_FIXED      = 0x1,
 440
 441         /* Reparse point corresponded to an absolute symbolic link or junction
 442          * point that pointed inside the directory tree being captured, where
 443          * the target was specified by a "full" \??\ prefixed path, and
 444          * therefore was fixed to be relative to the root of the directory tree
 445          * being captured. */
 446         RP_FIXED_FULLPATH = 0x2,
 447
 448         /* Same as RP_FIXED_FULLPATH, except the absolute link target did not
 449          * have the \??\ prefix.  It may have begun with a drive letter though.
 450          * */
 451         RP_FIXED_ABSPATH  = 0x4,
 452
 453         /* Either RP_FIXED_FULLPATH or RP_FIXED_ABSPATH. */
 454         RP_FIXED          = RP_FIXED_FULLPATH | RP_FIXED_ABSPATH,
 455 };
 456
 457 /* Given the "substitute name" target of a Windows reparse point, try doing a
 458  * fixup where we change it to be absolute relative to the root of the directory
 459  * tree being captured.
 460  *
 461  * Note that this is only executed when WIMLIB_ADD_FLAG_RPFIX has been
 462  * set.
 463  *
 464  * @capture_root_ino and @capture_root_dev indicate the inode number and device
 465  * of the root of the directory tree being captured.  They are meant to identify
 466  * this directory (as an alternative to its actual path, which could potentially
 467  * be reached via multiple destinations due to other symbolic links).  This may
 468  * not work properly on FAT, which doesn't seem to supply proper inode numbers
 469  * or file IDs.  However, FAT doesn't support reparse points so this function
 470  * wouldn't even be called anyway.
 471  */
 472 static enum rp_status
 473 win32_capture_maybe_rpfix_target(wchar_t *target, u16 *target_nbytes_p,
 474                                  u64 capture_root_ino, u64 capture_root_dev,
 475                                  u32 rptag)
 476 {
 477         u16 target_nchars = *target_nbytes_p / 2;
 478         size_t stripped_chars;
 479         wchar_t *orig_target;
 480         int ret;
 481
 482         ret = parse_substitute_name(target, *target_nbytes_p, rptag);
 483         if (ret < 0)
 484                 return RP_NOT_FIXED;
 485         stripped_chars = ret;
 486         if (stripped_chars)
 487                 stripped_chars -= 2;
 488         target[target_nchars] = L'\0';
 489         orig_target = target;
 490         target = capture_fixup_absolute_symlink(target + stripped_chars,
 491                                                 capture_root_ino, capture_root_dev);
 492         if (!target)
 493                 return RP_EXCLUDED;
 494         target_nchars = wcslen(target);
 495         wmemmove(orig_target + stripped_chars, target, target_nchars + 1);
 496         *target_nbytes_p = (target_nchars + stripped_chars) * sizeof(wchar_t);
 497         DEBUG("Fixed reparse point (new target: \"%ls\")", orig_target);
 498         if (stripped_chars)
 499                 return RP_FIXED_FULLPATH;
 500         else
 501                 return RP_FIXED_ABSPATH;
 502 }
 503
 504 /* Returns: `enum rp_status' value on success; negative WIMLIB_ERR_* value on
 505  * failure. */
 506 static int
 507 win32_capture_try_rpfix(u8 *rpbuf, u16 *rpbuflen_p,
 508                         u64 capture_root_ino, u64 capture_root_dev,
 509                         const wchar_t *path, struct add_image_params *params)
 510 {
 511         struct reparse_data rpdata;
 512         int ret;
 513         enum rp_status rp_status;
 514
 515         ret = parse_reparse_data(rpbuf, *rpbuflen_p, &rpdata);
 516         if (ret)
 517                 return -ret;
 518
 519         rp_status = win32_capture_maybe_rpfix_target(rpdata.substitute_name,
 520                                                      &rpdata.substitute_name_nbytes,
 521                                                      capture_root_ino,
 522                                                      capture_root_dev,
 523                                                      le32_to_cpu(*(le32*)rpbuf));
 524         if (rp_status & RP_FIXED) {
 525                 wimlib_assert(rpdata.substitute_name_nbytes % 2 == 0);
 526                 utf16lechar substitute_name_copy[rpdata.substitute_name_nbytes / 2];
 527                 wmemcpy(substitute_name_copy, rpdata.substitute_name,
 528                         rpdata.substitute_name_nbytes / 2);
 529                 rpdata.substitute_name = substitute_name_copy;
 530                 rpdata.print_name = substitute_name_copy;
 531                 rpdata.print_name_nbytes = rpdata.substitute_name_nbytes;
 532                 if (rp_status == RP_FIXED_FULLPATH) {
 533                         /* "full path", meaning \??\ prefixed.  We should not
 534                          * include this prefix in the print name, as it is
 535                          * apparently meant for the filesystem driver only. */
 536                         rpdata.print_name += 4;
 537                         rpdata.print_name_nbytes -= 8;
 538                 }
 539                 ret = make_reparse_buffer(&rpdata, rpbuf, rpbuflen_p);
 540                 if (ret == 0)
 541                         ret = rp_status;
 542                 else
 543                         ret = -ret;
 544         } else {
 545                 if (rp_status == RP_EXCLUDED) {
 546                         /* Ignoring absolute symbolic link or junction point
 547                          * that points out of the tree to be captured.  */
 548                         size_t print_name_nchars = rpdata.print_name_nbytes / 2;
 549                         wchar_t print_name0[print_name_nchars + 1];
 550                         print_name0[print_name_nchars] = L'\0';
 551                         wmemcpy(print_name0, rpdata.print_name, print_name_nchars);
 552
 553                         params->progress.scan.cur_path = path;
 554                         params->progress.scan.symlink_target = print_name0;
 555                         do_capture_progress(params,
 556                                             WIMLIB_SCAN_DENTRY_EXCLUDED_SYMLINK,
 557                                             NULL);
 558                 }
 559                 ret = rp_status;
 560         }
 561         return ret;
 562 }
 563
 564 /*
 565  * Loads the reparse point data from a reparse point into memory, optionally
 566  * fixing the targets of absolute symbolic links and junction points to be
 567  * relative to the root of capture.
 568  *
 569  * @h:      Open handle to the reparse point.
 570  * @path:   Path to the reparse point file.
 571  * @params: Additional parameters, including whether to do reparse point fixups
 572  *          or not.
 573  * @rpbuf:  Buffer of length at least REPARSE_POINT_MAX_SIZE bytes into which
 574  *          the reparse point buffer will be loaded.
 575  * @rpbuflen_ret:  On success, the length of the reparse point buffer in bytes
 576  *                 is written to this location.
 577  *
 578  * Returns:
 579  *      On success, returns an `enum rp_status' value that indicates if and/or
 580  *      how the reparse point fixup was done.
 581  *
 582  *      On failure, returns a negative value that is a negated WIMLIB_ERR_*
 583  *      code.
 584  */
 585 static int
 586 win32_get_reparse_data(HANDLE h, const wchar_t *path,
 587                        struct add_image_params *params,
 588                        u8 *rpbuf, u16 *rpbuflen_ret)
 589 {
 590         DWORD bytesReturned;
 591         u32 reparse_tag;
 592         int ret;
 593         u16 rpbuflen;
 594
 595         if (!DeviceIoControl(h, FSCTL_GET_REPARSE_POINT,
 596                              NULL, /* "Not used with this operation; set to NULL" */
 597                              0, /* "Not used with this operation; set to 0" */
 598                              rpbuf, /* "A pointer to a buffer that
 599                                                    receives the reparse point data */
 600                              REPARSE_POINT_MAX_SIZE, /* "The size of the output
 601                                                         buffer, in bytes */
 602                              &bytesReturned,
 603                              NULL))
 604         {
 605                 set_errno_from_GetLastError();
 606                 return -WIMLIB_ERR_READ;
 607         }
 608
 609         if (bytesReturned < 8 || bytesReturned > REPARSE_POINT_MAX_SIZE) {
 610                 errno = EINVAL;
 611                 return -WIMLIB_ERR_INVALID_REPARSE_DATA;
 612         }
 613
 614         rpbuflen = bytesReturned;
 615         reparse_tag = le32_to_cpu(*(le32*)rpbuf);
 616         if (params->add_flags & WIMLIB_ADD_FLAG_RPFIX &&
 617             (reparse_tag == WIM_IO_REPARSE_TAG_SYMLINK ||
 618              reparse_tag == WIM_IO_REPARSE_TAG_MOUNT_POINT))
 619         {
 620                 /* Try doing reparse point fixup */
 621                 ret = win32_capture_try_rpfix(rpbuf,
 622                                               &rpbuflen,
 623                                               params->capture_root_ino,
 624                                               params->capture_root_dev,
 625                                               path,
 626                                               params);
 627         } else {
 628                 ret = RP_NOT_FIXED;
 629         }
 630         *rpbuflen_ret = rpbuflen;
 631         return ret;
 632 }
 633
 634 static DWORD WINAPI
 635 win32_tally_encrypted_size_cb(unsigned char *_data, void *_size_ret,
 636                               unsigned long len)
 637 {
 638         *(u64*)_size_ret += len;
 639         return ERROR_SUCCESS;
 640 }
 641
 642 static int
 643 win32_get_encrypted_file_size(const wchar_t *path, u64 *size_ret)
 644 {
 645         DWORD err;
 646         void *file_ctx;
 647         int ret;
 648
 649         err = OpenEncryptedFileRaw(path, 0, &file_ctx);
 650         if (err != ERROR_SUCCESS) {
 651                 set_errno_from_win32_error(err);
 652                 ERROR_WITH_ERRNO("Failed to open encrypted file \"%ls\" "
 653                                  "for raw read", path);
 654                 return WIMLIB_ERR_OPEN;
 655         }
 656         *size_ret = 0;
 657         err = ReadEncryptedFileRaw(win32_tally_encrypted_size_cb,
 658                                    size_ret, file_ctx);
 659         if (err != ERROR_SUCCESS) {
 660                 set_errno_from_win32_error(err);
 661                 ERROR_WITH_ERRNO("Failed to read raw encrypted data from "
 662                                  "\"%ls\"", path);
 663                 ret = WIMLIB_ERR_READ;
 664         } else {
 665                 ret = 0;
 666         }
 667         CloseEncryptedFileRaw(file_ctx);
 668         return ret;
 669 }
 670
 671 static bool
 672 get_data_stream_name(const wchar_t *raw_stream_name, size_t raw_stream_name_nchars,
 673                      const wchar_t **stream_name_ret, size_t *stream_name_nchars_ret)
 674 {
 675         const wchar_t *sep, *type, *end;
 676
 677         /* The stream name should be returned as :NAME:TYPE  */
 678         if (raw_stream_name_nchars < 1)
 679                 return false;
 680         if (raw_stream_name[0] != L':')
 681                 return false;
 682
 683         raw_stream_name++;
 684         raw_stream_name_nchars--;
 685
 686         end = raw_stream_name + raw_stream_name_nchars;
 687
 688         sep = wmemchr(raw_stream_name, L':', raw_stream_name_nchars);
 689         if (!sep)
 690                 return false;
 691
 692         type = sep + 1;
 693         if (end - type != 5)
 694                 return false;
 695
 696         if (wmemcmp(type, L"$DATA", 5))
 697                 return false;
 698
 699         *stream_name_ret = raw_stream_name;
 700         *stream_name_nchars_ret = sep - raw_stream_name;
 701         return true;
 702 }
 703
 704 static wchar_t *
 705 build_stream_path(const wchar_t *path, size_t path_nchars,
 706                   const wchar_t *stream_name, size_t stream_name_nchars)
 707 {
 708         size_t stream_path_nchars;
 709         wchar_t *stream_path;
 710         wchar_t *p;
 711
 712         stream_path_nchars = path_nchars;
 713         if (stream_name_nchars)
 714                 stream_path_nchars += 1 + stream_name_nchars;
 715
 716         stream_path = MALLOC((stream_path_nchars + 1) * sizeof(wchar_t));
 717         if (stream_path) {
 718                 p = wmempcpy(stream_path, path, path_nchars);
 719                 if (stream_name_nchars) {
 720                         *p++ = L':';
 721                         p = wmempcpy(p, stream_name, stream_name_nchars);
 722                 }
 723                 *p++ = L'\0';
 724         }
 725         return stream_path;
 726 }
 727
 728 static int
 729 win32_capture_stream(const wchar_t *path, size_t path_nchars,
 730                      const wchar_t *raw_stream_name, size_t raw_stream_name_nchars,
 731                      u64 stream_size,
 732                      struct wim_inode *inode,
 733                      struct list_head *unhashed_streams)
 734 {
 735         const wchar_t *stream_name;
 736         size_t stream_name_nchars;
 737         struct wim_ads_entry *ads_entry;
 738         wchar_t *stream_path;
 739         struct wim_lookup_table_entry *lte;
 740         u32 stream_id;
 741
 742         /* Given the raw stream name (which is something like
 743          * L":streamname:$DATA", extract just the stream name part.  */
 744         if (!get_data_stream_name(raw_stream_name, raw_stream_name_nchars,
 745                                   &stream_name, &stream_name_nchars))
 746                 return 0;
 747
 748         /* If this is a named stream, allocate an ADS entry.  */
 749         if (stream_name_nchars) {
 750                 ads_entry = inode_add_ads_utf16le(inode, stream_name,
 751                                                   stream_name_nchars * sizeof(wchar_t));
 752                 if (!ads_entry)
 753                         return WIMLIB_ERR_NOMEM;
 754         } else {
 755                 ads_entry = NULL;
 756         }
 757
 758         /* If the stream is empty, no lookup table entry is needed. */
 759         if (stream_size == 0)
 760                 return 0;
 761
 762         /* Build the path to the stream.  For unnamed streams, this is simply
 763          * the path to the file.  For named streams, this is the path to the
 764          * file, followed by a colon, followed by the stream name.  */
 765         stream_path = build_stream_path(path, path_nchars,
 766                                         stream_name, stream_name_nchars);
 767         if (!stream_path)
 768                 return WIMLIB_ERR_NOMEM;
 769
 770         /* Set up the lookup table entry for the stream.  */
 771         lte = new_lookup_table_entry();
 772         if (!lte) {
 773                 FREE(stream_path);
 774                 return WIMLIB_ERR_NOMEM;
 775         }
 776         lte->file_on_disk = stream_path;
 777         lte->resource_location = RESOURCE_IN_FILE_ON_DISK;
 778         lte->size = stream_size;
 779         if ((inode->i_attributes & FILE_ATTRIBUTE_ENCRYPTED) && !ads_entry) {
 780                 /* Special case for encrypted file.  */
 781
 782                 /* OpenEncryptedFileRaw() expects Win32 name, not NT name.  */
 783                 lte->file_on_disk[1] = L'\\';
 784                 wimlib_assert(!wmemcmp(lte->file_on_disk, L"\\\\?\\", 4));
 785
 786                 u64 encrypted_size;
 787                 int ret;
 788
 789                 ret = win32_get_encrypted_file_size(lte->file_on_disk,
 790                                                     &encrypted_size);
 791                 if (ret) {
 792                         free_lookup_table_entry(lte);
 793                         return ret;
 794                 }
 795                 lte->size = encrypted_size;
 796                 lte->resource_location = RESOURCE_WIN32_ENCRYPTED;
 797         }
 798
 799         if (ads_entry) {
 800                 stream_id = ads_entry->stream_id;
 801                 ads_entry->lte = lte;
 802         } else {
 803                 stream_id = 0;
 804                 inode->i_lte = lte;
 805         }
 806         add_unhashed_stream(lte, inode, stream_id, unhashed_streams);
 807         return 0;
 808 }
 809
 810 /* Load information about the streams of an open file into a WIM inode.
 811  *
 812  * We use the NtQueryInformationFile() system call instead of FindFirstStream()
 813  * and FindNextStream().  This is done for two reasons:
 814  *
 815  * - FindFirstStream() opens its own handle to the file or directory and
 816  *   apparently does so without specifying FILE_FLAG_BACKUP_SEMANTICS, thereby
 817  *   causing access denied errors on certain files (even when running as the
 818  *   Administrator).
 819  * - FindFirstStream() and FindNextStream() is only available on Windows Vista
 820  *   and later, whereas the stream support in NtQueryInformationFile() was
 821  *   already present in Windows XP.
 822  */
 823 static int
 824 win32_capture_streams(HANDLE *hFile_p,
 825                       const wchar_t *path,
 826                       size_t path_nchars,
 827                       struct wim_inode *inode,
 828                       struct list_head *unhashed_streams,
 829                       u64 file_size,
 830                       DWORD vol_flags)
 831 {
 832         int ret;
 833         u8 _buf[1024] _aligned_attribute(8);
 834         u8 *buf;
 835         size_t bufsize;
 836         IO_STATUS_BLOCK io_status;
 837         NTSTATUS status;
 838         const FILE_STREAM_INFORMATION *info;
 839
 840         DEBUG("Capturing streams from \"%ls\"", path);
 841
 842         buf = _buf;
 843         bufsize = sizeof(_buf);
 844
 845         if (!(vol_flags & FILE_NAMED_STREAMS))
 846                 goto unnamed_only;
 847
 848         /* Get a buffer containing the stream information.  */
 849         while (!NT_SUCCESS(status = (*func_NtQueryInformationFile)(*hFile_p,
 850                                                                    &io_status,
 851                                                                    buf,
 852                                                                    bufsize,
 853                                                                    FileStreamInformation)))
 854         {
 855
 856                 switch (status) {
 857                 case STATUS_BUFFER_OVERFLOW:
 858                         {
 859                                 u8 *newbuf;
 860
 861                                 bufsize *= 2;
 862                                 if (buf == _buf)
 863                                         newbuf = MALLOC(bufsize);
 864                                 else
 865                                         newbuf = REALLOC(buf, bufsize);
 866                                 if (!newbuf) {
 867                                         ret = WIMLIB_ERR_NOMEM;
 868                                         goto out_free_buf;
 869                                 }
 870                                 buf = newbuf;
 871                         }
 872                         break;
 873                 case STATUS_NOT_IMPLEMENTED:
 874                 case STATUS_NOT_SUPPORTED:
 875                 case STATUS_INVALID_INFO_CLASS:
 876                         goto unnamed_only;
 877                 default:
 878                         set_errno_from_nt_status(status);
 879                         ERROR_WITH_ERRNO("\"%ls\": Failed to query "
 880                                          "stream information", path);
 881                         ret = WIMLIB_ERR_READ;
 882                         goto out_free_buf;
 883                 }
 884         }
 885
 886         if (io_status.Information == 0) {
 887                 /* No stream information.  */
 888                 ret = 0;
 889                 goto out_free_buf;
 890         }
 891
 892         if (inode->i_attributes & FILE_ATTRIBUTE_ENCRYPTED) {
 893                 /* OpenEncryptedFileRaw() seems to fail with
 894                  * ERROR_SHARING_VIOLATION if there are any handles opened to
 895                  * the file.  */
 896                 (*func_NtClose)(*hFile_p);
 897                 *hFile_p = INVALID_HANDLE_VALUE;
 898         }
 899
 900         /* Parse one or more stream information structures.  */
 901         info = (const FILE_STREAM_INFORMATION *)buf;
 902         for (;;) {
 903                 /* Capture the stream.  */
 904                 ret = win32_capture_stream(path, path_nchars,
 905                                            info->StreamName,
 906                                            info->StreamNameLength / 2,
 907                                            info->StreamSize.QuadPart,
 908                                            inode, unhashed_streams);
 909                 if (ret)
 910                         goto out_free_buf;
 911
 912                 if (info->NextEntryOffset == 0) {
 913                         /* No more stream information.  */
 914                         break;
 915                 }
 916                 /* Advance to next stream information.  */
 917                 info = (const FILE_STREAM_INFORMATION *)
 918                                 ((const u8 *)info + info->NextEntryOffset);
 919         }
 920         ret = 0;
 921         goto out_free_buf;
 922
 923 unnamed_only:
 924         /* The volume does not support named streams.  Only capture the unnamed
 925          * data stream. */
 926         DEBUG("Only capturing unnamed data stream");
 927         if (inode->i_attributes & (FILE_ATTRIBUTE_DIRECTORY |
 928                                    FILE_ATTRIBUTE_REPARSE_POINT))
 929         {
 930                 ret = 0;
 931                 goto out_free_buf;
 932         }
 933
 934         ret = win32_capture_stream(path, path_nchars,
 935                                    L"::$DATA", 7, file_size,
 936                                    inode, unhashed_streams);
 937 out_free_buf:
 938         /* Free buffer if allocated on heap.  */
 939         if (buf != _buf)
 940                 FREE(buf);
 941         return ret;
 942 }
 943
 944 static int
 945 win32_build_dentry_tree_recursive(struct wim_dentry **root_ret,
 946                                   HANDLE cur_dir,
 947                                   wchar_t *full_path,
 948                                   size_t full_path_nchars,
 949                                   const wchar_t *filename,
 950                                   size_t filename_nchars,
 951                                   struct add_image_params *params,
 952                                   struct win32_capture_state *state,
 953                                   DWORD vol_flags)
 954 {
 955         struct wim_dentry *root = NULL;
 956         struct wim_inode *inode = NULL;
 957         HANDLE h = INVALID_HANDLE_VALUE;
 958         int ret;
 959         NTSTATUS status;
 960         FILE_ALL_INFORMATION file_info;
 961         u8 *rpbuf;
 962         u16 rpbuflen;
 963         u16 not_rpfixed;
 964
 965         if (should_exclude_path(full_path + params->capture_root_nchars,
 966                                 full_path_nchars - params->capture_root_nchars,
 967                                 params->config))
 968         {
 969                 ret = 0;
 970                 goto out_progress;
 971         }
 972
 973         status = winnt_openat(cur_dir,
 974                               (cur_dir ? filename : full_path),
 975                               (cur_dir ? filename_nchars : full_path_nchars),
 976                               FILE_READ_DATA |
 977                                         FILE_READ_ATTRIBUTES |
 978                                         READ_CONTROL |
 979                                         ACCESS_SYSTEM_SECURITY |
 980                                         SYNCHRONIZE,
 981                               &h);
 982         if (!NT_SUCCESS(status)) {
 983                 set_errno_from_nt_status(status);
 984                 ERROR_WITH_ERRNO("\"%ls\": Can't open file", full_path);
 985                 ret = WIMLIB_ERR_OPEN;
 986                 goto out;
 987         }
 988
 989         {
 990                 IO_STATUS_BLOCK iosb;
 991
 992                 status = (*func_NtQueryInformationFile)(h, &iosb,
 993                                                         &file_info, sizeof(file_info),
 994                                                         FileAllInformation);
 995                 if (!NT_SUCCESS(status) && status != STATUS_BUFFER_OVERFLOW) {
 996                         set_errno_from_GetLastError();
 997                         ERROR_WITH_ERRNO("\"%ls\": Can't get file information", full_path);
 998                         ret = WIMLIB_ERR_STAT;
 999                         goto out;
1000                 }
1001         }
1002
1003         if (!cur_dir) {
1004                 /* Root directory; get volume information.  */
1005                 FILE_FS_ATTRIBUTE_INFORMATION attr_info;
1006                 FILE_FS_VOLUME_INFORMATION vol_info;
1007                 IO_STATUS_BLOCK iosb;
1008
1009                 /* Get volume flags  */
1010                 status = (*func_NtQueryVolumeInformationFile)(h, &iosb,
1011                                                               &attr_info, sizeof(attr_info),
1012                                                               FileFsAttributeInformation);
1013                 if ((NT_SUCCESS(status) || (status == STATUS_BUFFER_OVERFLOW)) &&
1014                     iosb.Information >= offsetof(FILE_FS_ATTRIBUTE_INFORMATION,
1015                                                  FileSystemAttributes) +
1016                                         sizeof(attr_info.FileSystemAttributes))
1017                 {
1018                         vol_flags = attr_info.FileSystemAttributes;
1019                 } else {
1020                         set_errno_from_nt_status(status);
1021                         WARNING_WITH_ERRNO("\"%ls\": Can't get volume attributes",
1022                                            full_path);
1023                         vol_flags = 0;
1024                 }
1025
1026                 /* Set inode number of root directory  */
1027                 params->capture_root_ino = file_info.InternalInformation.IndexNumber.QuadPart;
1028
1029                 /* Get volume ID  */
1030                 status = (*func_NtQueryVolumeInformationFile)(h, &iosb,
1031                                                               &vol_info, sizeof(vol_info),
1032                                                               FileFsVolumeInformation);
1033                 if ((NT_SUCCESS(status) || (status == STATUS_BUFFER_OVERFLOW)) &&
1034                     iosb.Information >= offsetof(FILE_FS_VOLUME_INFORMATION,
1035                                                  VolumeSerialNumber) +
1036                                         sizeof(vol_info.VolumeSerialNumber))
1037                 {
1038                         params->capture_root_dev = vol_info.VolumeSerialNumber;
1039                 } else {
1040                         set_errno_from_nt_status(status);
1041                         WARNING_WITH_ERRNO("\"%ls\": Can't get volume ID",
1042                                            full_path);
1043                         params->capture_root_dev = 0;
1044                 }
1045         }
1046
1047         if (file_info.BasicInformation.FileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
1048                 rpbuf = alloca(REPARSE_POINT_MAX_SIZE);
1049                 ret = win32_get_reparse_data(h, full_path,
1050                                              params, rpbuf, &rpbuflen);
1051                 if (ret < 0) {
1052                         /* WIMLIB_ERR_* (inverted) */
1053                         ret = -ret;
1054                         ERROR_WITH_ERRNO("\"%ls\": Can't get reparse data",
1055                                          full_path);
1056                         goto out;
1057                 } else if (ret & RP_FIXED) {
1058                         not_rpfixed = 0;
1059                 } else if (ret == RP_EXCLUDED) {
1060                         ret = 0;
1061                         goto out;
1062                 } else {
1063                         not_rpfixed = 1;
1064                 }
1065         }
1066
1067         /* Create a WIM dentry with an associated inode, which may be shared.
1068          *
1069          * However, we need to explicitly check for directories and files with
1070          * only 1 link and refuse to hard link them.  This is because Windows
1071          * has a bug where it can return duplicate File IDs for files and
1072          * directories on the FAT filesystem. */
1073         ret = inode_table_new_dentry(params->inode_table,
1074                                      filename,
1075                                      file_info.InternalInformation.IndexNumber.QuadPart,
1076                                      0, /* We don't follow mount points, so we
1077                                            currently don't need to get the
1078                                            volume ID / device number.  */
1079                                      (file_info.StandardInformation.NumberOfLinks <= 1 ||
1080                                         (file_info.BasicInformation.FileAttributes &
1081                                          FILE_ATTRIBUTE_DIRECTORY)),
1082                                      &root);
1083         if (ret)
1084                 goto out;
1085
1086         ret = win32_get_short_name(h, root);
1087         if (ret) {
1088                 ERROR_WITH_ERRNO("\"%ls\": Can't get short name", full_path);
1089                 goto out;
1090         }
1091
1092         inode = root->d_inode;
1093
1094         if (inode->i_nlink > 1) {
1095                 /* Shared inode; nothing more to do */
1096                 ret = 0;
1097                 goto out_progress;
1098         }
1099
1100         inode->i_attributes = file_info.BasicInformation.FileAttributes;
1101         inode->i_creation_time = file_info.BasicInformation.CreationTime.QuadPart;
1102         inode->i_last_write_time = file_info.BasicInformation.LastWriteTime.QuadPart;
1103         inode->i_last_access_time = file_info.BasicInformation.LastAccessTime.QuadPart;
1104         inode->i_resolved = 1;
1105
1106         params->add_flags &= ~WIMLIB_ADD_FLAG_ROOT;
1107
1108         if (!(params->add_flags & WIMLIB_ADD_FLAG_NO_ACLS)
1109             && (vol_flags & FILE_PERSISTENT_ACLS))
1110         {
1111                 ret = win32_get_security_descriptor(h, inode,
1112                                                     params->sd_set, state,
1113                                                     params->add_flags);
1114                 if (ret) {
1115                         ERROR_WITH_ERRNO("\"%ls\": Can't "
1116                                          "read security descriptor", full_path);
1117                         goto out;
1118                 }
1119         }
1120
1121         /* Capture the unnamed data stream (only should be present for regular
1122          * files) and any alternate data streams. */
1123         ret = win32_capture_streams(&h,
1124                                     full_path,
1125                                     full_path_nchars,
1126                                     inode,
1127                                     params->unhashed_streams,
1128                                     file_info.StandardInformation.EndOfFile.QuadPart,
1129                                     vol_flags);
1130         if (ret)
1131                 goto out;
1132
1133         if (inode->i_attributes & FILE_ATTRIBUTE_REPARSE_POINT) {
1134                 /* Reparse point: set the reparse data (which we read already)
1135                  * */
1136                 inode->i_not_rpfixed = not_rpfixed;
1137                 inode->i_reparse_tag = le32_to_cpu(*(le32*)rpbuf);
1138                 ret = inode_set_unnamed_stream(inode, rpbuf + 8, rpbuflen - 8,
1139                                                params->lookup_table);
1140         } else if (inode->i_attributes & FILE_ATTRIBUTE_DIRECTORY) {
1141                 /* Directory (not a reparse point) --- recurse to children */
1142
1143                 if (h == INVALID_HANDLE_VALUE) {
1144                         /* Re-open handle that was closed to read raw encrypted
1145                          * data.  */
1146                         status = winnt_openat(cur_dir,
1147                                               (cur_dir ?
1148                                                filename : full_path),
1149                                               (cur_dir ?
1150                                                filename_nchars : full_path_nchars),
1151                                               FILE_LIST_DIRECTORY | SYNCHRONIZE,
1152                                               &h);
1153                         if (!NT_SUCCESS(status)) {
1154                                 set_errno_from_nt_status(status);
1155                                 ERROR_WITH_ERRNO("\"%ls\": Can't open file",
1156                                                  full_path);
1157                                 ret = WIMLIB_ERR_OPEN;
1158                                 goto out;
1159                         }
1160                 }
1161                 ret = win32_recurse_directory(h,
1162                                               full_path,
1163                                               full_path_nchars,
1164                                               root,
1165                                               params,
1166                                               state,
1167                                               vol_flags);
1168         }
1169         if (ret)
1170                 goto out;
1171
1172 out_progress:
1173         params->progress.scan.cur_path = full_path;
1174         if (root)
1175                 do_capture_progress(params, WIMLIB_SCAN_DENTRY_OK, inode);
1176         else
1177                 do_capture_progress(params, WIMLIB_SCAN_DENTRY_EXCLUDED, NULL);
1178 out:
1179         if (h != INVALID_HANDLE_VALUE)
1180                 (*func_NtClose)(h);
1181         if (ret == 0)
1182                 *root_ret = root;
1183         else
1184                 free_dentry_tree(root, params->lookup_table);
1185         return ret;
1186 }
1187
1188 static void
1189 win32_do_capture_warnings(const wchar_t *path,
1190                           const struct win32_capture_state *state,
1191                           int add_flags)
1192 {
1193         if (state->num_get_sacl_priv_notheld == 0 &&
1194             state->num_get_sd_access_denied == 0)
1195                 return;
1196
1197         WARNING("Scan of \"%ls\" complete, but with one or more warnings:", path);
1198         if (state->num_get_sacl_priv_notheld != 0) {
1199                 WARNING("- Could not capture SACL (System Access Control List)\n"
1200                         "            on %lu files or directories.",
1201                         state->num_get_sacl_priv_notheld);
1202         }
1203         if (state->num_get_sd_access_denied != 0) {
1204                 WARNING("- Could not capture security descriptor at all\n"
1205                         "            on %lu files or directories.",
1206                         state->num_get_sd_access_denied);
1207         }
1208         WARNING("To fully capture all security descriptors, run the program\n"
1209                 "          with Administrator rights.");
1210 }
1211
1212 #define WINDOWS_NT_MAX_PATH 32768
1213
1214 /* Win32 version of capturing a directory tree */
1215 int
1216 win32_build_dentry_tree(struct wim_dentry **root_ret,
1217                         const wchar_t *root_disk_path,
1218                         struct add_image_params *params)
1219 {
1220         wchar_t *path;
1221         DWORD dret;
1222         size_t path_nchars;
1223         int ret;
1224         struct win32_capture_state state;
1225
1226         /* WARNING: There is no check for overflow later when this buffer is
1227          * being used!  But it's as long as the maximum path length understood
1228          * by Windows NT (which is NOT the same as MAX_PATH).  */
1229         path = MALLOC((WINDOWS_NT_MAX_PATH + 1) * sizeof(wchar_t));
1230         if (!path)
1231                 return WIMLIB_ERR_NOMEM;
1232
1233         /* Translate into full path.  */
1234         dret = GetFullPathName(root_disk_path, WINDOWS_NT_MAX_PATH - 3,
1235                                &path[4], NULL);
1236
1237         if (dret == 0 || dret >= WINDOWS_NT_MAX_PATH - 3) {
1238                 ERROR("Can't get full path name for \"%ls\"", root_disk_path);
1239                 return WIMLIB_ERR_UNSUPPORTED;
1240         }
1241
1242         /* Add \??\ prefix to form the NT namespace path.  */
1243         wmemcpy(path, L"\\??\\", 4);
1244         path_nchars = dret + 4;
1245
1246        /* Strip trailing slashes.  If we don't do this, we may create a path
1247         * with multiple consecutive backslashes, which for some reason causes
1248         * Windows to report that the file cannot be found.  */
1249         while (path_nchars >= 2 &&
1250                path[path_nchars - 1] == L'\\' &&
1251                path[path_nchars - 2] != L':')
1252         {
1253                 path[--path_nchars] = L'\0';
1254         }
1255
1256         params->capture_root_nchars = path_nchars;
1257
1258         memset(&state, 0, sizeof(state));
1259         ret = win32_build_dentry_tree_recursive(root_ret, NULL,
1260                                                 path, path_nchars, L"", 0,
1261                                                 params, &state, 0);
1262         FREE(path);
1263         if (ret == 0)
1264                 win32_do_capture_warnings(root_disk_path, &state, params->add_flags);
1265         return ret;
1266 }
1267
1268 #endif /* __WIN32__ */