wimlib.net Git - wimlib/blob - src/win32_capture.c

   1 /*
   2  * win32_capture.c - Windows-specific code for capturing files into a WIM image.
   3  *
   4  * This now uses the native Windows NT API a lot and not just Win32.
   5  */
   6
   7 /*
   8  * Copyright (C) 2013, 2014 Eric Biggers
   9  *
  10  * This file is part of wimlib, a library for working with WIM files.
  11  *
  12  * wimlib is free software; you can redistribute it and/or modify it under the
  13  * terms of the GNU General Public License as published by the Free
  14  * Software Foundation; either version 3 of the License, or (at your option)
  15  * any later version.
  16  *
  17  * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
  18  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  19  * A PARTICULAR PURPOSE. See the GNU General Public License for more
  20  * details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  24  */
  25
  26 #ifdef __WIN32__
  27
  28 #ifdef HAVE_CONFIG_H
  29 #  include "config.h"
  30 #endif
  31
  32 #include "wimlib/win32_common.h"
  33
  34 #include "wimlib/capture.h"
  35 #include "wimlib/dentry.h"
  36 #include "wimlib/encoding.h"
  37 #include "wimlib/endianness.h"
  38 #include "wimlib/error.h"
  39 #include "wimlib/lookup_table.h"
  40 #include "wimlib/paths.h"
  41 #include "wimlib/reparse.h"
  42
  43 #include <errno.h>
  44
  45 struct winnt_scan_stats {
  46         unsigned long num_get_sd_access_denied;
  47         unsigned long num_get_sacl_priv_notheld;
  48         unsigned long num_long_path_warnings;
  49 };
  50
  51 static inline const wchar_t *
  52 printable_path(const wchar_t *full_path)
  53 {
  54         /* Skip over \\?\ or \??\  */
  55         return full_path + 4;
  56 }
  57
  58 /*
  59  * If cur_dir is not NULL, open an existing file relative to the already-open
  60  * directory cur_dir.
  61  *
  62  * Otherwise, open the file specified by @path, which must be a Windows NT
  63  * namespace path.
  64  */
  65 static NTSTATUS
  66 winnt_openat(HANDLE cur_dir, const wchar_t *path, size_t path_nchars,
  67              ACCESS_MASK perms, HANDLE *h_ret)
  68 {
  69         UNICODE_STRING name;
  70         OBJECT_ATTRIBUTES attr;
  71         IO_STATUS_BLOCK iosb;
  72         NTSTATUS status;
  73
  74         name.Length = path_nchars * sizeof(wchar_t);
  75         name.MaximumLength = name.Length + sizeof(wchar_t);
  76         name.Buffer = (wchar_t *)path;
  77
  78         attr.Length = sizeof(attr);
  79         attr.RootDirectory = cur_dir;
  80         attr.ObjectName = &name;
  81         attr.Attributes = 0;
  82         attr.SecurityDescriptor = NULL;
  83         attr.SecurityQualityOfService = NULL;
  84
  85 retry:
  86         status = (*func_NtOpenFile)(h_ret, perms, &attr, &iosb,
  87                                     FILE_SHARE_READ |
  88                                             FILE_SHARE_WRITE |
  89                                             FILE_SHARE_DELETE,
  90                                     FILE_OPEN_REPARSE_POINT |
  91                                             FILE_OPEN_FOR_BACKUP_INTENT |
  92                                             FILE_SYNCHRONOUS_IO_NONALERT |
  93                                             FILE_SEQUENTIAL_ONLY);
  94         if (!NT_SUCCESS(status)) {
  95                 /* Try requesting fewer permissions  */
  96                 if (status == STATUS_ACCESS_DENIED ||
  97                     status == STATUS_PRIVILEGE_NOT_HELD) {
  98                         if (perms & ACCESS_SYSTEM_SECURITY) {
  99                                 perms &= ~ACCESS_SYSTEM_SECURITY;
 100                                 goto retry;
 101                         }
 102                         if (perms & READ_CONTROL) {
 103                                 perms &= ~READ_CONTROL;
 104                                 goto retry;
 105                         }
 106                 }
 107         }
 108         return status;
 109 }
 110
 111 /* Read the first @size bytes from the file, or named data stream of a file,
 112  * from which the stream entry @lte was created.  */
 113 int
 114 read_winnt_file_prefix(const struct wim_lookup_table_entry *lte, u64 size,
 115                        consume_data_callback_t cb, void *cb_ctx)
 116 {
 117         const wchar_t *path;
 118         HANDLE h;
 119         NTSTATUS status;
 120         u8 buf[BUFFER_SIZE];
 121         u64 bytes_remaining;
 122         int ret;
 123
 124         /* This is an NT namespace path.  */
 125         path = lte->file_on_disk;
 126
 127         status = winnt_openat(NULL, path, wcslen(path),
 128                               FILE_READ_DATA | SYNCHRONIZE, &h);
 129         if (!NT_SUCCESS(status)) {
 130                 set_errno_from_nt_status(status);
 131                 ERROR_WITH_ERRNO("\"%ls\": Can't open for reading "
 132                                  "(status=0x%08"PRIx32")",
 133                                  printable_path(path), (u32)status);
 134                 return WIMLIB_ERR_OPEN;
 135         }
 136
 137         ret = 0;
 138         bytes_remaining = size;
 139         while (bytes_remaining) {
 140                 IO_STATUS_BLOCK iosb;
 141                 ULONG count;
 142                 ULONG bytes_read;
 143
 144                 count = min(sizeof(buf), bytes_remaining);
 145
 146                 status = (*func_NtReadFile)(h, NULL, NULL, NULL,
 147                                             &iosb, buf, count, NULL, NULL);
 148                 if (!NT_SUCCESS(status)) {
 149                         set_errno_from_nt_status(status);
 150                         ERROR_WITH_ERRNO("\"%ls\": Error reading data "
 151                                          "(status=0x%08"PRIx32")",
 152                                          printable_path(path), (u32)status);
 153                         ret = WIMLIB_ERR_READ;
 154                         break;
 155                 }
 156
 157                 bytes_read = iosb.Information;
 158
 159                 bytes_remaining -= bytes_read;
 160                 ret = (*cb)(buf, bytes_read, cb_ctx);
 161                 if (ret)
 162                         break;
 163         }
 164         (*func_NtClose)(h);
 165         return ret;
 166 }
 167
 168 struct win32_encrypted_read_ctx {
 169         consume_data_callback_t read_prefix_cb;
 170         void *read_prefix_ctx;
 171         int wimlib_err_code;
 172         u64 bytes_remaining;
 173 };
 174
 175 static DWORD WINAPI
 176 win32_encrypted_export_cb(unsigned char *data, void *_ctx, unsigned long len)
 177 {
 178         struct win32_encrypted_read_ctx *ctx = _ctx;
 179         int ret;
 180         size_t bytes_to_consume = min(len, ctx->bytes_remaining);
 181
 182         if (bytes_to_consume == 0)
 183                 return ERROR_SUCCESS;
 184
 185         ret = (*ctx->read_prefix_cb)(data, bytes_to_consume, ctx->read_prefix_ctx);
 186         if (ret) {
 187                 ctx->wimlib_err_code = ret;
 188                 /* Shouldn't matter what error code is returned here, as long as
 189                  * it isn't ERROR_SUCCESS.  */
 190                 return ERROR_READ_FAULT;
 191         }
 192         ctx->bytes_remaining -= bytes_to_consume;
 193         return ERROR_SUCCESS;
 194 }
 195
 196 int
 197 read_win32_encrypted_file_prefix(const struct wim_lookup_table_entry *lte,
 198                                  u64 size,
 199                                  consume_data_callback_t cb, void *cb_ctx)
 200 {
 201         struct win32_encrypted_read_ctx export_ctx;
 202         DWORD err;
 203         void *file_ctx;
 204         int ret;
 205
 206         export_ctx.read_prefix_cb = cb;
 207         export_ctx.read_prefix_ctx = cb_ctx;
 208         export_ctx.wimlib_err_code = 0;
 209         export_ctx.bytes_remaining = size;
 210
 211         err = OpenEncryptedFileRaw(lte->file_on_disk, 0, &file_ctx);
 212         if (err != ERROR_SUCCESS) {
 213                 set_errno_from_win32_error(err);
 214                 ERROR_WITH_ERRNO("Failed to open encrypted file \"%ls\" "
 215                                  "for raw read",
 216                                  printable_path(lte->file_on_disk));
 217                 return WIMLIB_ERR_OPEN;
 218         }
 219         err = ReadEncryptedFileRaw(win32_encrypted_export_cb,
 220                                    &export_ctx, file_ctx);
 221         if (err != ERROR_SUCCESS) {
 222                 set_errno_from_win32_error(err);
 223                 ERROR_WITH_ERRNO("Failed to read encrypted file \"%ls\"",
 224                                  printable_path(lte->file_on_disk));
 225                 ret = export_ctx.wimlib_err_code;
 226                 if (ret == 0)
 227                         ret = WIMLIB_ERR_READ;
 228         } else if (export_ctx.bytes_remaining != 0) {
 229                 ERROR("Only could read %"PRIu64" of %"PRIu64" bytes from "
 230                       "encryted file \"%ls\"",
 231                       size - export_ctx.bytes_remaining, size,
 232                       printable_path(lte->file_on_disk));
 233                 ret = WIMLIB_ERR_READ;
 234         } else {
 235                 ret = 0;
 236         }
 237         CloseEncryptedFileRaw(file_ctx);
 238         return ret;
 239 }
 240
 241 /*
 242  * Load the short name of a file into a WIM dentry.
 243  */
 244 static NTSTATUS
 245 winnt_get_short_name(HANDLE h, struct wim_dentry *dentry)
 246 {
 247         /* It's not any harder to just make the NtQueryInformationFile() system
 248          * call ourselves, and it saves a dumb call to FindFirstFile() which of
 249          * course has to create its own handle.  */
 250         NTSTATUS status;
 251         IO_STATUS_BLOCK iosb;
 252         u8 buf[128] _aligned_attribute(8);
 253         const FILE_NAME_INFORMATION *info;
 254
 255         status = (*func_NtQueryInformationFile)(h, &iosb, buf, sizeof(buf),
 256                                                 FileAlternateNameInformation);
 257         info = (const FILE_NAME_INFORMATION *)buf;
 258         if (NT_SUCCESS(status) && info->FileNameLength != 0) {
 259                 dentry->short_name = utf16le_dupz(info->FileName,
 260                                                   info->FileNameLength);
 261                 if (!dentry->short_name)
 262                         return STATUS_NO_MEMORY;
 263                 dentry->short_name_nbytes = info->FileNameLength;
 264         }
 265         return status;
 266 }
 267
 268 /*
 269  * Load the security descriptor of a file into the corresponding inode, and the
 270  * WIM image's security descriptor set.
 271  */
 272 static NTSTATUS
 273 winnt_get_security_descriptor(HANDLE h, struct wim_inode *inode,
 274                               struct wim_sd_set *sd_set,
 275                               struct winnt_scan_stats *stats, int add_flags)
 276 {
 277         SECURITY_INFORMATION requestedInformation;
 278         u8 _buf[4096] _aligned_attribute(8);
 279         u8 *buf;
 280         ULONG bufsize;
 281         ULONG len_needed;
 282         NTSTATUS status;
 283         int ret;
 284
 285         requestedInformation = DACL_SECURITY_INFORMATION |
 286                                SACL_SECURITY_INFORMATION |
 287                                OWNER_SECURITY_INFORMATION |
 288                                GROUP_SECURITY_INFORMATION;
 289         buf = _buf;
 290         bufsize = sizeof(_buf);
 291
 292         /*
 293          * We need the file's security descriptor in
 294          * SECURITY_DESCRIPTOR_RELATIVE format, and we currently have a handle
 295          * opened with as many relevant permissions as possible.  At this point,
 296          * on Windows there are a number of options for reading a file's
 297          * security descriptor:
 298          *
 299          * GetFileSecurity():  This takes in a path and returns the
 300          * SECURITY_DESCRIPTOR_RELATIVE.  Problem: this uses an internal handle,
 301          * not ours, and the handle created internally doesn't specify
 302          * FILE_FLAG_BACKUP_SEMANTICS.  Therefore there can be access denied
 303          * errors on some files and directories, even when running as the
 304          * Administrator.
 305          *
 306          * GetSecurityInfo():  This takes in a handle and returns the security
 307          * descriptor split into a bunch of different parts.  This should work,
 308          * but it's dumb because we have to put the security descriptor back
 309          * together again.
 310          *
 311          * BackupRead():  This can read the security descriptor, but this is a
 312          * difficult-to-use API, probably only works as the Administrator, and
 313          * the format of the returned data is not well documented.
 314          *
 315          * NtQuerySecurityObject():  This is exactly what we need, as it takes
 316          * in a handle and returns the security descriptor in
 317          * SECURITY_DESCRIPTOR_RELATIVE format.  Only problem is that it's a
 318          * ntdll function and therefore not officially part of the Win32 API.
 319          * Oh well.
 320          */
 321         while (!(NT_SUCCESS(status = (*func_NtQuerySecurityObject)(h,
 322                                                                    requestedInformation,
 323                                                                    (PSECURITY_DESCRIPTOR)buf,
 324                                                                    bufsize,
 325                                                                    &len_needed))))
 326         {
 327                 switch (status) {
 328                 case STATUS_BUFFER_TOO_SMALL:
 329                         wimlib_assert(buf == _buf);
 330                         buf = MALLOC(len_needed);
 331                         if (!buf)
 332                                 return STATUS_NO_MEMORY;
 333                         bufsize = len_needed;
 334                         break;
 335                 case STATUS_PRIVILEGE_NOT_HELD:
 336                 case STATUS_ACCESS_DENIED:
 337                         if (add_flags & WIMLIB_ADD_FLAG_STRICT_ACLS) {
 338                 default:
 339                                 /* Permission denied in STRICT_ACLS mode, or
 340                                  * unknown error.  */
 341                                 goto out_free_buf;
 342                         }
 343                         if (requestedInformation & SACL_SECURITY_INFORMATION) {
 344                                 /* Try again without the SACL.  */
 345                                 stats->num_get_sacl_priv_notheld++;
 346                                 requestedInformation &= ~SACL_SECURITY_INFORMATION;
 347                                 break;
 348                         }
 349                         /* Fake success (useful when capturing as
 350                          * non-Administrator).  */
 351                         stats->num_get_sd_access_denied++;
 352                         status = STATUS_SUCCESS;
 353                         goto out_free_buf;
 354                 }
 355         }
 356
 357         /* Add the security descriptor to the WIM image, and save its ID in
 358          * file's inode.  */
 359         inode->i_security_id = sd_set_add_sd(sd_set, buf, len_needed);
 360         if (unlikely(inode->i_security_id < 0))
 361                 status = STATUS_NO_MEMORY;
 362 out_free_buf:
 363         if (unlikely(buf != _buf))
 364                 FREE(buf);
 365         return status;
 366 }
 367
 368 static int
 369 winnt_build_dentry_tree_recursive(struct wim_dentry **root_ret,
 370                                   HANDLE cur_dir,
 371                                   wchar_t *full_path,
 372                                   size_t full_path_nchars,
 373                                   const wchar_t *filename,
 374                                   size_t filename_nchars,
 375                                   struct add_image_params *params,
 376                                   struct winnt_scan_stats *stats,
 377                                   u32 vol_flags);
 378
 379 static int
 380 winnt_recurse_directory(HANDLE h,
 381                         wchar_t *full_path,
 382                         size_t full_path_nchars,
 383                         struct wim_dentry *parent,
 384                         struct add_image_params *params,
 385                         struct winnt_scan_stats *stats,
 386                         u32 vol_flags)
 387 {
 388         void *buf;
 389         const size_t bufsize = 8192;
 390         IO_STATUS_BLOCK iosb;
 391         NTSTATUS status;
 392         int ret;
 393
 394         buf = MALLOC(bufsize);
 395         if (!buf)
 396                 return WIMLIB_ERR_NOMEM;
 397
 398         /* Using NtQueryDirectoryFile() we can re-use the same open handle,
 399          * which we opened with FILE_FLAG_BACKUP_SEMANTICS.  */
 400
 401         while (NT_SUCCESS(status = (*func_NtQueryDirectoryFile)(h, NULL, NULL, NULL,
 402                                                                 &iosb, buf, bufsize,
 403                                                                 FileNamesInformation,
 404                                                                 FALSE, NULL, FALSE)))
 405         {
 406                 const FILE_NAMES_INFORMATION *info = buf;
 407                 for (;;) {
 408                         if (!(info->FileNameLength == 2 && info->FileName[0] == L'.') &&
 409                             !(info->FileNameLength == 4 && info->FileName[0] == L'.' &&
 410                                                            info->FileName[1] == L'.'))
 411                         {
 412                                 wchar_t *p;
 413                                 struct wim_dentry *child;
 414
 415                                 p = full_path + full_path_nchars;
 416                                 *p++ = L'\\';
 417                                 p = wmempcpy(p, info->FileName,
 418                                              info->FileNameLength / 2);
 419                                 *p = '\0';
 420
 421                                 ret = winnt_build_dentry_tree_recursive(
 422                                                         &child,
 423                                                         h,
 424                                                         full_path,
 425                                                         p - full_path,
 426                                                         full_path + full_path_nchars + 1,
 427                                                         info->FileNameLength / 2,
 428                                                         params,
 429                                                         stats,
 430                                                         vol_flags);
 431
 432                                 full_path[full_path_nchars] = L'\0';
 433
 434                                 if (ret)
 435                                         goto out_free_buf;
 436                                 if (child)
 437                                         dentry_add_child(parent, child);
 438                         }
 439                         if (info->NextEntryOffset == 0)
 440                                 break;
 441                         info = (const FILE_NAMES_INFORMATION *)
 442                                         ((const u8 *)info + info->NextEntryOffset);
 443                 }
 444         }
 445
 446         if (unlikely(status != STATUS_NO_MORE_FILES)) {
 447                 set_errno_from_nt_status(status);
 448                 ERROR_WITH_ERRNO("\"%ls\": Can't read directory "
 449                                  "(status=0x%08"PRIx32")",
 450                                  printable_path(full_path), (u32)status);
 451                 ret = WIMLIB_ERR_READ;
 452         }
 453 out_free_buf:
 454         FREE(buf);
 455         return ret;
 456 }
 457
 458 /* Reparse point fixup status code */
 459 enum rp_status {
 460         /* Reparse point corresponded to an absolute symbolic link or junction
 461          * point that pointed outside the directory tree being captured, and
 462          * therefore was excluded. */
 463         RP_EXCLUDED       = 0x0,
 464
 465         /* Reparse point was not fixed as it was either a relative symbolic
 466          * link, a mount point, or something else we could not understand. */
 467         RP_NOT_FIXED      = 0x1,
 468
 469         /* Reparse point corresponded to an absolute symbolic link or junction
 470          * point that pointed inside the directory tree being captured, where
 471          * the target was specified by a "full" \??\ prefixed path, and
 472          * therefore was fixed to be relative to the root of the directory tree
 473          * being captured. */
 474         RP_FIXED_FULLPATH = 0x2,
 475
 476         /* Same as RP_FIXED_FULLPATH, except the absolute link target did not
 477          * have the \??\ prefix.  It may have begun with a drive letter though.
 478          * */
 479         RP_FIXED_ABSPATH  = 0x4,
 480
 481         /* Either RP_FIXED_FULLPATH or RP_FIXED_ABSPATH. */
 482         RP_FIXED          = RP_FIXED_FULLPATH | RP_FIXED_ABSPATH,
 483 };
 484
 485 /* Given the "substitute name" target of a Windows reparse point, try doing a
 486  * fixup where we change it to be absolute relative to the root of the directory
 487  * tree being captured.
 488  *
 489  * Note that this is only executed when WIMLIB_ADD_FLAG_RPFIX has been
 490  * set.
 491  *
 492  * @capture_root_ino and @capture_root_dev indicate the inode number and device
 493  * of the root of the directory tree being captured.  They are meant to identify
 494  * this directory (as an alternative to its actual path, which could potentially
 495  * be reached via multiple destinations due to other symbolic links).  This may
 496  * not work properly on FAT, which doesn't seem to supply proper inode numbers
 497  * or file IDs.  However, FAT doesn't support reparse points so this function
 498  * wouldn't even be called anyway.
 499  */
 500 static enum rp_status
 501 winnt_capture_maybe_rpfix_target(wchar_t *target, u16 *target_nbytes_p,
 502                                  u64 capture_root_ino, u64 capture_root_dev,
 503                                  u32 rptag)
 504 {
 505         u16 target_nchars = *target_nbytes_p / 2;
 506         size_t stripped_chars;
 507         wchar_t *orig_target;
 508         int ret;
 509
 510         ret = parse_substitute_name(target, *target_nbytes_p, rptag);
 511         if (ret < 0)
 512                 return RP_NOT_FIXED;
 513         stripped_chars = ret;
 514         if (stripped_chars)
 515                 stripped_chars -= 2;
 516         target[target_nchars] = L'\0';
 517         orig_target = target;
 518         target = capture_fixup_absolute_symlink(target + stripped_chars,
 519                                                 capture_root_ino, capture_root_dev);
 520         if (!target)
 521                 return RP_EXCLUDED;
 522         target_nchars = wcslen(target);
 523         wmemmove(orig_target + stripped_chars, target, target_nchars + 1);
 524         *target_nbytes_p = (target_nchars + stripped_chars) * sizeof(wchar_t);
 525         if (stripped_chars)
 526                 return RP_FIXED_FULLPATH;
 527         else
 528                 return RP_FIXED_ABSPATH;
 529 }
 530
 531 /* Returns: `enum rp_status' value on success; negative WIMLIB_ERR_* value on
 532  * failure. */
 533 static int
 534 winnt_capture_try_rpfix(u8 *rpbuf, u16 *rpbuflen_p,
 535                         u64 capture_root_ino, u64 capture_root_dev,
 536                         const wchar_t *path, struct add_image_params *params)
 537 {
 538         struct reparse_data rpdata;
 539         int ret;
 540         enum rp_status rp_status;
 541
 542         ret = parse_reparse_data(rpbuf, *rpbuflen_p, &rpdata);
 543         if (ret)
 544                 return -ret;
 545
 546         rp_status = winnt_capture_maybe_rpfix_target(rpdata.substitute_name,
 547                                                      &rpdata.substitute_name_nbytes,
 548                                                      capture_root_ino,
 549                                                      capture_root_dev,
 550                                                      le32_to_cpu(*(le32*)rpbuf));
 551         if (rp_status & RP_FIXED) {
 552                 wimlib_assert(rpdata.substitute_name_nbytes % 2 == 0);
 553                 utf16lechar substitute_name_copy[rpdata.substitute_name_nbytes / 2];
 554                 wmemcpy(substitute_name_copy, rpdata.substitute_name,
 555                         rpdata.substitute_name_nbytes / 2);
 556                 rpdata.substitute_name = substitute_name_copy;
 557                 rpdata.print_name = substitute_name_copy;
 558                 rpdata.print_name_nbytes = rpdata.substitute_name_nbytes;
 559                 if (rp_status == RP_FIXED_FULLPATH) {
 560                         /* "full path", meaning \??\ prefixed.  We should not
 561                          * include this prefix in the print name, as it is
 562                          * apparently meant for the filesystem driver only. */
 563                         rpdata.print_name += 4;
 564                         rpdata.print_name_nbytes -= 8;
 565                 }
 566                 ret = make_reparse_buffer(&rpdata, rpbuf, rpbuflen_p);
 567                 if (ret == 0)
 568                         ret = rp_status;
 569                 else
 570                         ret = -ret;
 571         } else {
 572                 if (rp_status == RP_EXCLUDED) {
 573                         /* Ignoring absolute symbolic link or junction point
 574                          * that points out of the tree to be captured.  */
 575                         size_t print_name_nchars = rpdata.print_name_nbytes / 2;
 576                         wchar_t print_name0[print_name_nchars + 1];
 577                         print_name0[print_name_nchars] = L'\0';
 578                         wmemcpy(print_name0, rpdata.print_name, print_name_nchars);
 579
 580                         params->progress.scan.cur_path = printable_path(path);
 581                         params->progress.scan.symlink_target = print_name0;
 582                         do_capture_progress(params,
 583                                             WIMLIB_SCAN_DENTRY_EXCLUDED_SYMLINK,
 584                                             NULL);
 585                 }
 586                 ret = rp_status;
 587         }
 588         return ret;
 589 }
 590
 591 /*
 592  * Loads the reparse point data from a reparse point into memory, optionally
 593  * fixing the targets of absolute symbolic links and junction points to be
 594  * relative to the root of capture.
 595  *
 596  * @h:      Open handle to the reparse point.
 597  * @path:   Path to the reparse point file.
 598  * @params: Additional parameters, including whether to do reparse point fixups
 599  *          or not.
 600  * @rpbuf:  Buffer of length at least REPARSE_POINT_MAX_SIZE bytes into which
 601  *          the reparse point buffer will be loaded.
 602  * @rpbuflen_ret:  On success, the length of the reparse point buffer in bytes
 603  *                 is written to this location.
 604  *
 605  * Returns:
 606  *      On success, returns an `enum rp_status' value that indicates if and/or
 607  *      how the reparse point fixup was done.
 608  *
 609  *      On failure, returns a negative value that is a negated WIMLIB_ERR_*
 610  *      code.
 611  */
 612 static int
 613 winnt_get_reparse_data(HANDLE h, const wchar_t *path,
 614                        struct add_image_params *params,
 615                        u8 *rpbuf, u16 *rpbuflen_ret)
 616 {
 617         DWORD bytesReturned;
 618         u32 reparse_tag;
 619         int ret;
 620         u16 rpbuflen;
 621
 622         if (!DeviceIoControl(h, FSCTL_GET_REPARSE_POINT,
 623                              NULL, /* "Not used with this operation; set to NULL" */
 624                              0, /* "Not used with this operation; set to 0" */
 625                              rpbuf, /* "A pointer to a buffer that
 626                                                    receives the reparse point data */
 627                              REPARSE_POINT_MAX_SIZE, /* "The size of the output
 628                                                         buffer, in bytes */
 629                              &bytesReturned,
 630                              NULL))
 631         {
 632                 set_errno_from_GetLastError();
 633                 return -WIMLIB_ERR_READ;
 634         }
 635
 636         if (bytesReturned < 8 || bytesReturned > REPARSE_POINT_MAX_SIZE) {
 637                 errno = EINVAL;
 638                 return -WIMLIB_ERR_INVALID_REPARSE_DATA;
 639         }
 640
 641         rpbuflen = bytesReturned;
 642         reparse_tag = le32_to_cpu(*(le32*)rpbuf);
 643         if (params->add_flags & WIMLIB_ADD_FLAG_RPFIX &&
 644             (reparse_tag == WIM_IO_REPARSE_TAG_SYMLINK ||
 645              reparse_tag == WIM_IO_REPARSE_TAG_MOUNT_POINT))
 646         {
 647                 /* Try doing reparse point fixup */
 648                 ret = winnt_capture_try_rpfix(rpbuf,
 649                                               &rpbuflen,
 650                                               params->capture_root_ino,
 651                                               params->capture_root_dev,
 652                                               path,
 653                                               params);
 654         } else {
 655                 ret = RP_NOT_FIXED;
 656         }
 657         *rpbuflen_ret = rpbuflen;
 658         return ret;
 659 }
 660
 661 static DWORD WINAPI
 662 win32_tally_encrypted_size_cb(unsigned char *_data, void *_size_ret,
 663                               unsigned long len)
 664 {
 665         *(u64*)_size_ret += len;
 666         return ERROR_SUCCESS;
 667 }
 668
 669 static int
 670 win32_get_encrypted_file_size(const wchar_t *path, u64 *size_ret)
 671 {
 672         DWORD err;
 673         void *file_ctx;
 674         int ret;
 675
 676         err = OpenEncryptedFileRaw(path, 0, &file_ctx);
 677         if (err != ERROR_SUCCESS) {
 678                 set_errno_from_win32_error(err);
 679                 ERROR_WITH_ERRNO("Failed to open encrypted file \"%ls\" "
 680                                  "for raw read", printable_path(path));
 681                 return WIMLIB_ERR_OPEN;
 682         }
 683         *size_ret = 0;
 684         err = ReadEncryptedFileRaw(win32_tally_encrypted_size_cb,
 685                                    size_ret, file_ctx);
 686         if (err != ERROR_SUCCESS) {
 687                 set_errno_from_win32_error(err);
 688                 ERROR_WITH_ERRNO("Failed to read raw encrypted data from "
 689                                  "\"%ls\"", printable_path(path));
 690                 ret = WIMLIB_ERR_READ;
 691         } else {
 692                 ret = 0;
 693         }
 694         CloseEncryptedFileRaw(file_ctx);
 695         return ret;
 696 }
 697
 698 static bool
 699 get_data_stream_name(const wchar_t *raw_stream_name, size_t raw_stream_name_nchars,
 700                      const wchar_t **stream_name_ret, size_t *stream_name_nchars_ret)
 701 {
 702         const wchar_t *sep, *type, *end;
 703
 704         /* The stream name should be returned as :NAME:TYPE  */
 705         if (raw_stream_name_nchars < 1)
 706                 return false;
 707         if (raw_stream_name[0] != L':')
 708                 return false;
 709
 710         raw_stream_name++;
 711         raw_stream_name_nchars--;
 712
 713         end = raw_stream_name + raw_stream_name_nchars;
 714
 715         sep = wmemchr(raw_stream_name, L':', raw_stream_name_nchars);
 716         if (!sep)
 717                 return false;
 718
 719         type = sep + 1;
 720         if (end - type != 5)
 721                 return false;
 722
 723         if (wmemcmp(type, L"$DATA", 5))
 724                 return false;
 725
 726         *stream_name_ret = raw_stream_name;
 727         *stream_name_nchars_ret = sep - raw_stream_name;
 728         return true;
 729 }
 730
 731 static wchar_t *
 732 build_stream_path(const wchar_t *path, size_t path_nchars,
 733                   const wchar_t *stream_name, size_t stream_name_nchars)
 734 {
 735         size_t stream_path_nchars;
 736         wchar_t *stream_path;
 737         wchar_t *p;
 738
 739         stream_path_nchars = path_nchars;
 740         if (stream_name_nchars)
 741                 stream_path_nchars += 1 + stream_name_nchars;
 742
 743         stream_path = MALLOC((stream_path_nchars + 1) * sizeof(wchar_t));
 744         if (stream_path) {
 745                 p = wmempcpy(stream_path, path, path_nchars);
 746                 if (stream_name_nchars) {
 747                         *p++ = L':';
 748                         p = wmempcpy(p, stream_name, stream_name_nchars);
 749                 }
 750                 *p++ = L'\0';
 751         }
 752         return stream_path;
 753 }
 754
 755 static int
 756 winnt_scan_stream(const wchar_t *path, size_t path_nchars,
 757                   const wchar_t *raw_stream_name, size_t raw_stream_name_nchars,
 758                   u64 stream_size,
 759                   struct wim_inode *inode, struct list_head *unhashed_streams)
 760 {
 761         const wchar_t *stream_name;
 762         size_t stream_name_nchars;
 763         struct wim_ads_entry *ads_entry;
 764         wchar_t *stream_path;
 765         struct wim_lookup_table_entry *lte;
 766         u32 stream_id;
 767
 768         /* Given the raw stream name (which is something like
 769          * :streamname:$DATA), extract just the stream name part.
 770          * Ignore any non-$DATA streams.  */
 771         if (!get_data_stream_name(raw_stream_name, raw_stream_name_nchars,
 772                                   &stream_name, &stream_name_nchars))
 773                 return 0;
 774
 775         /* If this is a named stream, allocate an ADS entry for it.  */
 776         if (stream_name_nchars) {
 777                 ads_entry = inode_add_ads_utf16le(inode, stream_name,
 778                                                   stream_name_nchars *
 779                                                         sizeof(wchar_t));
 780                 if (!ads_entry)
 781                         return WIMLIB_ERR_NOMEM;
 782         } else {
 783                 ads_entry = NULL;
 784         }
 785
 786         /* If the stream is empty, no lookup table entry is needed. */
 787         if (stream_size == 0)
 788                 return 0;
 789
 790         /* Build the path to the stream.  For unnamed streams, this is simply
 791          * the path to the file.  For named streams, this is the path to the
 792          * file, followed by a colon, followed by the stream name.  */
 793         stream_path = build_stream_path(path, path_nchars,
 794                                         stream_name, stream_name_nchars);
 795         if (!stream_path)
 796                 return WIMLIB_ERR_NOMEM;
 797
 798         /* Set up the lookup table entry for the stream.  */
 799         lte = new_lookup_table_entry();
 800         if (!lte) {
 801                 FREE(stream_path);
 802                 return WIMLIB_ERR_NOMEM;
 803         }
 804         lte->file_on_disk = stream_path;
 805         lte->resource_location = RESOURCE_IN_WINNT_FILE_ON_DISK;
 806         lte->size = stream_size;
 807         if ((inode->i_attributes & FILE_ATTRIBUTE_ENCRYPTED) && !ads_entry) {
 808                 /* Special case for encrypted file.  */
 809
 810                 /* OpenEncryptedFileRaw() expects Win32 name, not NT name.
 811                  * Change \??\ into \\?\  */
 812                 lte->file_on_disk[1] = L'\\';
 813                 wimlib_assert(!wmemcmp(lte->file_on_disk, L"\\\\?\\", 4));
 814
 815                 u64 encrypted_size;
 816                 int ret;
 817
 818                 ret = win32_get_encrypted_file_size(lte->file_on_disk,
 819                                                     &encrypted_size);
 820                 if (ret) {
 821                         free_lookup_table_entry(lte);
 822                         return ret;
 823                 }
 824                 lte->size = encrypted_size;
 825                 lte->resource_location = RESOURCE_WIN32_ENCRYPTED;
 826         }
 827
 828         if (ads_entry) {
 829                 stream_id = ads_entry->stream_id;
 830                 ads_entry->lte = lte;
 831         } else {
 832                 stream_id = 0;
 833                 inode->i_lte = lte;
 834         }
 835         add_unhashed_stream(lte, inode, stream_id, unhashed_streams);
 836         return 0;
 837 }
 838
 839 /*
 840  * Load information about the streams of an open file into a WIM inode.
 841  *
 842  * We use the NtQueryInformationFile() system call instead of FindFirstStream()
 843  * and FindNextStream().  This is done for two reasons:
 844  *
 845  * - FindFirstStream() opens its own handle to the file or directory and
 846  *   apparently does so without specifying FILE_FLAG_BACKUP_SEMANTICS, thereby
 847  *   causing access denied errors on certain files (even when running as the
 848  *   Administrator).
 849  * - FindFirstStream() and FindNextStream() is only available on Windows Vista
 850  *   and later, whereas the stream support in NtQueryInformationFile() was
 851  *   already present in Windows XP.
 852  */
 853 static int
 854 winnt_scan_streams(HANDLE *hFile_p, const wchar_t *path, size_t path_nchars,
 855                    struct wim_inode *inode, struct list_head *unhashed_streams,
 856                    u64 file_size, u32 vol_flags)
 857 {
 858         int ret;
 859         u8 _buf[1024] _aligned_attribute(8);
 860         u8 *buf;
 861         size_t bufsize;
 862         IO_STATUS_BLOCK iosb;
 863         NTSTATUS status;
 864         const FILE_STREAM_INFORMATION *info;
 865
 866         buf = _buf;
 867         bufsize = sizeof(_buf);
 868
 869         if (!(vol_flags & FILE_NAMED_STREAMS))
 870                 goto unnamed_only;
 871
 872         /* Get a buffer containing the stream information.  */
 873         while (!NT_SUCCESS(status = (*func_NtQueryInformationFile)(*hFile_p,
 874                                                                    &iosb,
 875                                                                    buf,
 876                                                                    bufsize,
 877                                                                    FileStreamInformation)))
 878         {
 879
 880                 switch (status) {
 881                 case STATUS_BUFFER_OVERFLOW:
 882                         {
 883                                 u8 *newbuf;
 884
 885                                 bufsize *= 2;
 886                                 if (buf == _buf)
 887                                         newbuf = MALLOC(bufsize);
 888                                 else
 889                                         newbuf = REALLOC(buf, bufsize);
 890                                 if (!newbuf) {
 891                                         ret = WIMLIB_ERR_NOMEM;
 892                                         goto out_free_buf;
 893                                 }
 894                                 buf = newbuf;
 895                         }
 896                         break;
 897                 case STATUS_NOT_IMPLEMENTED:
 898                 case STATUS_NOT_SUPPORTED:
 899                 case STATUS_INVALID_INFO_CLASS:
 900                         goto unnamed_only;
 901                 default:
 902                         set_errno_from_nt_status(status);
 903                         ERROR_WITH_ERRNO("\"%ls\": Failed to query stream "
 904                                          "information (status=0x%08"PRIx32")",
 905                                          printable_path(path), (u32)status);
 906                         ret = WIMLIB_ERR_READ;
 907                         goto out_free_buf;
 908                 }
 909         }
 910
 911         if (iosb.Information == 0) {
 912                 /* No stream information.  */
 913                 ret = 0;
 914                 goto out_free_buf;
 915         }
 916
 917         if (unlikely(inode->i_attributes & FILE_ATTRIBUTE_ENCRYPTED)) {
 918                 /* OpenEncryptedFileRaw() seems to fail with
 919                  * ERROR_SHARING_VIOLATION if there are any handles opened to
 920                  * the file.  */
 921                 (*func_NtClose)(*hFile_p);
 922                 *hFile_p = INVALID_HANDLE_VALUE;
 923         }
 924
 925         /* Parse one or more stream information structures.  */
 926         info = (const FILE_STREAM_INFORMATION *)buf;
 927         for (;;) {
 928                 /* Load the stream information.  */
 929                 ret = winnt_scan_stream(path, path_nchars,
 930                                         info->StreamName,
 931                                         info->StreamNameLength / 2,
 932                                         info->StreamSize.QuadPart,
 933                                         inode, unhashed_streams);
 934                 if (ret)
 935                         goto out_free_buf;
 936
 937                 if (info->NextEntryOffset == 0) {
 938                         /* No more stream information.  */
 939                         break;
 940                 }
 941                 /* Advance to next stream information.  */
 942                 info = (const FILE_STREAM_INFORMATION *)
 943                                 ((const u8 *)info + info->NextEntryOffset);
 944         }
 945         ret = 0;
 946         goto out_free_buf;
 947
 948 unnamed_only:
 949         /* The volume does not support named streams.  Only capture the unnamed
 950          * data stream.  */
 951         if (inode->i_attributes & (FILE_ATTRIBUTE_DIRECTORY |
 952                                    FILE_ATTRIBUTE_REPARSE_POINT))
 953         {
 954                 ret = 0;
 955                 goto out_free_buf;
 956         }
 957
 958         ret = winnt_scan_stream(path, path_nchars, L"::$DATA", 7,
 959                                 file_size, inode, unhashed_streams);
 960 out_free_buf:
 961         /* Free buffer if allocated on heap.  */
 962         if (unlikely(buf != _buf))
 963                 FREE(buf);
 964         return ret;
 965 }
 966
 967 static int
 968 winnt_build_dentry_tree_recursive(struct wim_dentry **root_ret,
 969                                   HANDLE cur_dir,
 970                                   wchar_t *full_path,
 971                                   size_t full_path_nchars,
 972                                   const wchar_t *filename,
 973                                   size_t filename_nchars,
 974                                   struct add_image_params *params,
 975                                   struct winnt_scan_stats *stats,
 976                                   u32 vol_flags)
 977 {
 978         struct wim_dentry *root = NULL;
 979         struct wim_inode *inode = NULL;
 980         HANDLE h = INVALID_HANDLE_VALUE;
 981         int ret;
 982         NTSTATUS status;
 983         FILE_ALL_INFORMATION file_info;
 984         u8 *rpbuf;
 985         u16 rpbuflen;
 986         u16 not_rpfixed;
 987
 988         if (should_exclude_path(full_path + params->capture_root_nchars,
 989                                 full_path_nchars - params->capture_root_nchars,
 990                                 params->config))
 991         {
 992                 ret = 0;
 993                 goto out_progress;
 994         }
 995
 996         /* Open the file.  */
 997         status = winnt_openat(cur_dir,
 998                               (cur_dir ? filename : full_path),
 999                               (cur_dir ? filename_nchars : full_path_nchars),
1000                               FILE_READ_DATA |
1001                                         FILE_READ_ATTRIBUTES |
1002                                         READ_CONTROL |
1003                                         ACCESS_SYSTEM_SECURITY |
1004                                         SYNCHRONIZE,
1005                               &h);
1006         if (unlikely(!NT_SUCCESS(status))) {
1007                 set_errno_from_nt_status(status);
1008                 ERROR_WITH_ERRNO("\"%ls\": Can't open file "
1009                                  "(status=0x%08"PRIx32")",
1010                                  printable_path(full_path), (u32)status);
1011                 ret = WIMLIB_ERR_OPEN;
1012                 goto out;
1013         }
1014
1015         /* Get information about the file.  */
1016         {
1017                 IO_STATUS_BLOCK iosb;
1018
1019                 status = (*func_NtQueryInformationFile)(h, &iosb,
1020                                                         &file_info,
1021                                                         sizeof(file_info),
1022                                                         FileAllInformation);
1023
1024                 if (unlikely(!NT_SUCCESS(status) &&
1025                              status != STATUS_BUFFER_OVERFLOW))
1026                 {
1027                         set_errno_from_nt_status(status);
1028                         ERROR_WITH_ERRNO("\"%ls\": Can't get file information "
1029                                          "(status=0x%08"PRIx32")",
1030                                          printable_path(full_path), (u32)status);
1031                         ret = WIMLIB_ERR_STAT;
1032                         goto out;
1033                 }
1034         }
1035
1036         if (unlikely(!cur_dir)) {
1037
1038                 /* Root of tree being captured; get volume information.  */
1039
1040                 FILE_FS_ATTRIBUTE_INFORMATION attr_info;
1041                 FILE_FS_VOLUME_INFORMATION vol_info;
1042                 IO_STATUS_BLOCK iosb;
1043
1044                 /* Get volume flags  */
1045                 status = (*func_NtQueryVolumeInformationFile)(h, &iosb,
1046                                                               &attr_info,
1047                                                               sizeof(attr_info),
1048                                                               FileFsAttributeInformation);
1049                 if (likely((NT_SUCCESS(status) ||
1050                             (status == STATUS_BUFFER_OVERFLOW)) &&
1051                            (iosb.Information >=
1052                                 offsetof(FILE_FS_ATTRIBUTE_INFORMATION,
1053                                          FileSystemAttributes) +
1054                                 sizeof(attr_info.FileSystemAttributes))))
1055                 {
1056                         vol_flags = attr_info.FileSystemAttributes;
1057                 } else {
1058                         set_errno_from_nt_status(status);
1059                         WARNING_WITH_ERRNO("\"%ls\": Can't get volume attributes "
1060                                            "(status=0x%"PRIx32")",
1061                                            printable_path(full_path),
1062                                            (u32)status);
1063                         vol_flags = 0;
1064                 }
1065
1066                 /* Set inode number of root directory  */
1067                 params->capture_root_ino =
1068                         file_info.InternalInformation.IndexNumber.QuadPart;
1069
1070                 /* Get volume ID.  */
1071                 status = (*func_NtQueryVolumeInformationFile)(h, &iosb,
1072                                                               &vol_info,
1073                                                               sizeof(vol_info),
1074                                                               FileFsVolumeInformation);
1075                 if (likely((NT_SUCCESS(status) ||
1076                             (status == STATUS_BUFFER_OVERFLOW)) &&
1077                            (iosb.Information >=
1078                                 offsetof(FILE_FS_VOLUME_INFORMATION,
1079                                          VolumeSerialNumber) +
1080                                 sizeof(vol_info.VolumeSerialNumber))))
1081                 {
1082                         params->capture_root_dev = vol_info.VolumeSerialNumber;
1083                 } else {
1084                         set_errno_from_nt_status(status);
1085                         WARNING_WITH_ERRNO("\"%ls\": Can't get volume ID "
1086                                            "(status=0x%08"PRIx32")",
1087                                            printable_path(full_path),
1088                                            (u32)status);
1089                         params->capture_root_dev = 0;
1090                 }
1091         }
1092
1093         /* If this is a reparse point, read the reparse data.  */
1094         if (unlikely(file_info.BasicInformation.FileAttributes &
1095                      FILE_ATTRIBUTE_REPARSE_POINT))
1096         {
1097                 rpbuf = alloca(REPARSE_POINT_MAX_SIZE);
1098                 ret = winnt_get_reparse_data(h, full_path, params,
1099                                              rpbuf, &rpbuflen);
1100                 if (ret < 0) {
1101                         /* WIMLIB_ERR_* (inverted) */
1102                         ret = -ret;
1103                         ERROR_WITH_ERRNO("\"%ls\": Can't get reparse data",
1104                                          printable_path(full_path));
1105                         goto out;
1106                 } else if (ret & RP_FIXED) {
1107                         not_rpfixed = 0;
1108                 } else if (ret == RP_EXCLUDED) {
1109                         ret = 0;
1110                         goto out;
1111                 } else {
1112                         not_rpfixed = 1;
1113                 }
1114         }
1115
1116         /* Create a WIM dentry with an associated inode, which may be shared.
1117          *
1118          * However, we need to explicitly check for directories and files with
1119          * only 1 link and refuse to hard link them.  This is because Windows
1120          * has a bug where it can return duplicate File IDs for files and
1121          * directories on the FAT filesystem. */
1122         ret = inode_table_new_dentry(params->inode_table,
1123                                      filename,
1124                                      file_info.InternalInformation.IndexNumber.QuadPart,
1125                                      0, /* We don't follow mount points, so we
1126                                            currently don't need to get the
1127                                            volume ID / device number.  */
1128                                      (file_info.StandardInformation.NumberOfLinks <= 1 ||
1129                                         (file_info.BasicInformation.FileAttributes &
1130                                          FILE_ATTRIBUTE_DIRECTORY)),
1131                                      &root);
1132         if (ret)
1133                 goto out;
1134
1135         /* Get the short (DOS) name of the file.  */
1136         status = winnt_get_short_name(h, root);
1137
1138         /* If we can't read the short filename for any reason other than
1139          * out-of-memory, just ignore the error and assume the file has no short
1140          * name.  This shouldn't be an issue, since the short names are
1141          * essentially obsolete anyway.  */
1142         if (unlikely(status == STATUS_NO_MEMORY)) {
1143                 ret = WIMLIB_ERR_NOMEM;
1144                 goto out;
1145         }
1146
1147         inode = root->d_inode;
1148
1149         if (inode->i_nlink > 1) {
1150                 /* Shared inode (hard link); skip reading per-inode information.
1151                  */
1152                 ret = 0;
1153                 goto out_progress;
1154         }
1155
1156         inode->i_attributes = file_info.BasicInformation.FileAttributes;
1157         inode->i_creation_time = file_info.BasicInformation.CreationTime.QuadPart;
1158         inode->i_last_write_time = file_info.BasicInformation.LastWriteTime.QuadPart;
1159         inode->i_last_access_time = file_info.BasicInformation.LastAccessTime.QuadPart;
1160         inode->i_resolved = 1;
1161
1162         /* Get the file's security descriptor, unless we are capturing in
1163          * NO_ACLS mode or the volume does not support security descriptors.  */
1164         if (!(params->add_flags & WIMLIB_ADD_FLAG_NO_ACLS)
1165             && (vol_flags & FILE_PERSISTENT_ACLS))
1166         {
1167                 status = winnt_get_security_descriptor(h, inode,
1168                                                        params->sd_set, stats,
1169                                                        params->add_flags);
1170                 if (!NT_SUCCESS(status)) {
1171                         set_errno_from_nt_status(status);
1172                         ERROR_WITH_ERRNO("\"%ls\": Can't read security "
1173                                          "descriptor (status=0x%08"PRIu32")",
1174                                          printable_path(full_path),
1175                                          (u32)status);
1176                         ret = WIMLIB_ERR_STAT;
1177                         goto out;
1178                 }
1179         }
1180
1181         /* Load information about the unnamed data stream and any named data
1182          * streams.  */
1183         ret = winnt_scan_streams(&h,
1184                                  full_path,
1185                                  full_path_nchars,
1186                                  inode,
1187                                  params->unhashed_streams,
1188                                  file_info.StandardInformation.EndOfFile.QuadPart,
1189                                  vol_flags);
1190         if (ret)
1191                 goto out;
1192
1193         if (unlikely(inode->i_attributes & FILE_ATTRIBUTE_REPARSE_POINT)) {
1194
1195                 /* Reparse point: set the reparse data (already read).  */
1196
1197                 inode->i_not_rpfixed = not_rpfixed;
1198                 inode->i_reparse_tag = le32_to_cpu(*(le32*)rpbuf);
1199                 ret = inode_set_unnamed_stream(inode, rpbuf + 8, rpbuflen - 8,
1200                                                params->lookup_table);
1201                 if (ret)
1202                         goto out;
1203         } else if (inode->i_attributes & FILE_ATTRIBUTE_DIRECTORY) {
1204
1205                 /* Directory: recurse to children.  */
1206
1207                 if (unlikely(h == INVALID_HANDLE_VALUE)) {
1208                         /* Re-open handle that was closed to read raw encrypted
1209                          * data.  */
1210                         status = winnt_openat(cur_dir,
1211                                               (cur_dir ?
1212                                                filename : full_path),
1213                                               (cur_dir ?
1214                                                filename_nchars : full_path_nchars),
1215                                               FILE_LIST_DIRECTORY | SYNCHRONIZE,
1216                                               &h);
1217                         if (!NT_SUCCESS(status)) {
1218                                 set_errno_from_nt_status(status);
1219                                 ERROR_WITH_ERRNO("\"%ls\": Can't re-open file "
1220                                                  "(status=0x%08"PRIx32")",
1221                                                  printable_path(full_path),
1222                                                  (u32)status);
1223                                 ret = WIMLIB_ERR_OPEN;
1224                                 goto out;
1225                         }
1226                 }
1227                 ret = winnt_recurse_directory(h,
1228                                               full_path,
1229                                               full_path_nchars,
1230                                               root,
1231                                               params,
1232                                               stats,
1233                                               vol_flags);
1234                 if (ret)
1235                         goto out;
1236         }
1237
1238 out_progress:
1239         params->progress.scan.cur_path = printable_path(full_path);
1240         if (likely(root))
1241                 do_capture_progress(params, WIMLIB_SCAN_DENTRY_OK, inode);
1242         else
1243                 do_capture_progress(params, WIMLIB_SCAN_DENTRY_EXCLUDED, NULL);
1244 out:
1245         if (likely(h != INVALID_HANDLE_VALUE))
1246                 (*func_NtClose)(h);
1247         if (likely(ret == 0))
1248                 *root_ret = root;
1249         else
1250                 free_dentry_tree(root, params->lookup_table);
1251         return ret;
1252 }
1253
1254 static void
1255 winnt_do_scan_warnings(const wchar_t *path, const struct winnt_scan_stats *stats)
1256 {
1257         if (likely(stats->num_get_sacl_priv_notheld == 0 &&
1258                    stats->num_get_sd_access_denied == 0))
1259                 return;
1260
1261         WARNING("Scan of \"%ls\" complete, but with one or more warnings:", path);
1262         if (stats->num_get_sacl_priv_notheld != 0) {
1263                 WARNING("- Could not capture SACL (System Access Control List)\n"
1264                         "            on %lu files or directories.",
1265                         stats->num_get_sacl_priv_notheld);
1266         }
1267         if (stats->num_get_sd_access_denied != 0) {
1268                 WARNING("- Could not capture security descriptor at all\n"
1269                         "            on %lu files or directories.",
1270                         stats->num_get_sd_access_denied);
1271         }
1272         WARNING("To fully capture all security descriptors, run the program\n"
1273                 "          with Administrator rights.");
1274 }
1275
1276 #define WINDOWS_NT_MAX_PATH 32768
1277
1278 /* Win32 version of capturing a directory tree.  */
1279 int
1280 win32_build_dentry_tree(struct wim_dentry **root_ret,
1281                         const wchar_t *root_disk_path,
1282                         struct add_image_params *params)
1283 {
1284         wchar_t *path;
1285         DWORD dret;
1286         size_t path_nchars;
1287         int ret;
1288         struct winnt_scan_stats stats;
1289
1290         /* WARNING: There is no check for overflow later when this buffer is
1291          * being used!  But it's as long as the maximum path length understood
1292          * by Windows NT (which is NOT the same as MAX_PATH).  */
1293         path = MALLOC((WINDOWS_NT_MAX_PATH + 1) * sizeof(wchar_t));
1294         if (!path)
1295                 return WIMLIB_ERR_NOMEM;
1296
1297         /* Translate into full path.  */
1298         dret = GetFullPathName(root_disk_path, WINDOWS_NT_MAX_PATH - 3,
1299                                &path[4], NULL);
1300
1301         if (unlikely(dret == 0 || dret >= WINDOWS_NT_MAX_PATH - 3)) {
1302                 ERROR("Can't get full path name for \"%ls\"", root_disk_path);
1303                 return WIMLIB_ERR_UNSUPPORTED;
1304         }
1305
1306         /* Add \??\ prefix to form the NT namespace path.  */
1307         wmemcpy(path, L"\\??\\", 4);
1308         path_nchars = dret + 4;
1309
1310        /* Strip trailing slashes.  If we don't do this, we may create a path
1311         * with multiple consecutive backslashes, which for some reason causes
1312         * Windows to report that the file cannot be found.  */
1313         while (unlikely(path[path_nchars - 1] == L'\\' &&
1314                         path[path_nchars - 2] != L':'))
1315                 path[--path_nchars] = L'\0';
1316
1317         params->capture_root_nchars = path_nchars;
1318
1319         memset(&stats, 0, sizeof(stats));
1320
1321         ret = winnt_build_dentry_tree_recursive(root_ret, NULL,
1322                                                 path, path_nchars, L"", 0,
1323                                                 params, &stats, 0);
1324         FREE(path);
1325         if (ret == 0)
1326                 winnt_do_scan_warnings(root_disk_path, &stats);
1327         return ret;
1328 }
1329
1330 #endif /* __WIN32__ */