/* * extract.c * * Support for extracting WIM images, or files or directories contained in a WIM * image. */ /* * Copyright (C) 2012, 2013, 2014, 2015 Eric Biggers * * This file is free software; you can redistribute it and/or modify it under * the terms of the GNU Lesser General Public License as published by the Free * Software Foundation; either version 3 of the License, or (at your option) any * later version. * * This file is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more * details. * * You should have received a copy of the GNU Lesser General Public License * along with this file; if not, see http://www.gnu.org/licenses/. */ /* * This file provides the API functions wimlib_extract_image(), * wimlib_extract_image_from_pipe(), wimlib_extract_paths(), and * wimlib_extract_pathlist(). Internally, all end up calling * do_wimlib_extract_paths() and extract_trees(). * * Although wimlib supports multiple extraction modes/backends (NTFS-3g, UNIX, * Win32), this file does not itself have code to extract files or directories * to any specific target; instead, it handles generic functionality and relies * on lower-level callback functions declared in `struct apply_operations' to do * the actual extraction. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include #include "wimlib/apply.h" #include "wimlib/assert.h" #include "wimlib/blob_table.h" #include "wimlib/dentry.h" #include "wimlib/encoding.h" #include "wimlib/endianness.h" #include "wimlib/error.h" #include "wimlib/metadata.h" #include "wimlib/pathlist.h" #include "wimlib/paths.h" #include "wimlib/reparse.h" #include "wimlib/resource.h" #include "wimlib/security.h" #include "wimlib/unix_data.h" #include "wimlib/wildcard.h" #include "wimlib/wim.h" #include "wimlib/win32.h" /* for realpath() equivalent */ #include "wimlib/xml.h" #define WIMLIB_EXTRACT_FLAG_FROM_PIPE 0x80000000 #define WIMLIB_EXTRACT_FLAG_IMAGEMODE 0x40000000 /* Keep in sync with wimlib.h */ #define WIMLIB_EXTRACT_MASK_PUBLIC \ (WIMLIB_EXTRACT_FLAG_NTFS | \ WIMLIB_EXTRACT_FLAG_UNIX_DATA | \ WIMLIB_EXTRACT_FLAG_NO_ACLS | \ WIMLIB_EXTRACT_FLAG_STRICT_ACLS | \ WIMLIB_EXTRACT_FLAG_RPFIX | \ WIMLIB_EXTRACT_FLAG_NORPFIX | \ WIMLIB_EXTRACT_FLAG_TO_STDOUT | \ WIMLIB_EXTRACT_FLAG_REPLACE_INVALID_FILENAMES | \ WIMLIB_EXTRACT_FLAG_ALL_CASE_CONFLICTS | \ WIMLIB_EXTRACT_FLAG_STRICT_TIMESTAMPS | \ WIMLIB_EXTRACT_FLAG_STRICT_SHORT_NAMES | \ WIMLIB_EXTRACT_FLAG_STRICT_SYMLINKS | \ WIMLIB_EXTRACT_FLAG_GLOB_PATHS | \ WIMLIB_EXTRACT_FLAG_STRICT_GLOB | \ WIMLIB_EXTRACT_FLAG_NO_ATTRIBUTES | \ WIMLIB_EXTRACT_FLAG_NO_PRESERVE_DIR_STRUCTURE | \ WIMLIB_EXTRACT_FLAG_WIMBOOT) /* Send WIMLIB_PROGRESS_MSG_EXTRACT_FILE_STRUCTURE or * WIMLIB_PROGRESS_MSG_EXTRACT_METADATA. */ int do_file_extract_progress(struct apply_ctx *ctx, enum wimlib_progress_msg msg) { ctx->count_until_file_progress = 500; /* Arbitrary value to limit calls */ return extract_progress(ctx, msg); } static int start_file_phase(struct apply_ctx *ctx, u64 end_file_count, enum wimlib_progress_msg msg) { ctx->progress.extract.current_file_count = 0; ctx->progress.extract.end_file_count = end_file_count; return do_file_extract_progress(ctx, msg); } int start_file_structure_phase(struct apply_ctx *ctx, u64 end_file_count) { return start_file_phase(ctx, end_file_count, WIMLIB_PROGRESS_MSG_EXTRACT_FILE_STRUCTURE); } int start_file_metadata_phase(struct apply_ctx *ctx, u64 end_file_count) { return start_file_phase(ctx, end_file_count, WIMLIB_PROGRESS_MSG_EXTRACT_METADATA); } static int end_file_phase(struct apply_ctx *ctx, enum wimlib_progress_msg msg) { ctx->progress.extract.current_file_count = ctx->progress.extract.end_file_count; return do_file_extract_progress(ctx, msg); } int end_file_structure_phase(struct apply_ctx *ctx) { return end_file_phase(ctx, WIMLIB_PROGRESS_MSG_EXTRACT_FILE_STRUCTURE); } int end_file_metadata_phase(struct apply_ctx *ctx) { return end_file_phase(ctx, WIMLIB_PROGRESS_MSG_EXTRACT_METADATA); } #define PWM_FOUND_WIM_HDR (-1) /* Read the header for a blob in a pipable WIM. If @pwm_hdr_ret is not NULL, * also look for a pipable WIM header and return PWM_FOUND_WIM_HDR if found. */ static int read_pwm_blob_header(WIMStruct *pwm, u8 hash_ret[SHA1_HASH_SIZE], struct wim_reshdr *reshdr_ret, struct wim_header_disk *pwm_hdr_ret) { int ret; struct pwm_blob_hdr blob_hdr; u64 magic; ret = full_read(&pwm->in_fd, &blob_hdr, sizeof(blob_hdr)); if (unlikely(ret)) goto read_error; magic = le64_to_cpu(blob_hdr.magic); if (magic == PWM_MAGIC && pwm_hdr_ret != NULL) { memcpy(pwm_hdr_ret, &blob_hdr, sizeof(blob_hdr)); ret = full_read(&pwm->in_fd, (u8 *)pwm_hdr_ret + sizeof(blob_hdr), sizeof(*pwm_hdr_ret) - sizeof(blob_hdr)); if (unlikely(ret)) goto read_error; return PWM_FOUND_WIM_HDR; } if (unlikely(magic != PWM_BLOB_MAGIC)) { ERROR("Data read on pipe is invalid (expected blob header)"); return WIMLIB_ERR_INVALID_PIPABLE_WIM; } copy_hash(hash_ret, blob_hdr.hash); reshdr_ret->size_in_wim = 0; /* Not available */ reshdr_ret->flags = le32_to_cpu(blob_hdr.flags); reshdr_ret->offset_in_wim = pwm->in_fd.offset; reshdr_ret->uncompressed_size = le64_to_cpu(blob_hdr.uncompressed_size); if (unlikely(reshdr_ret->uncompressed_size == 0)) { ERROR("Data read on pipe is invalid (resource is of 0 size)"); return WIMLIB_ERR_INVALID_PIPABLE_WIM; } return 0; read_error: if (ret == WIMLIB_ERR_UNEXPECTED_END_OF_FILE) ERROR("The pipe ended before all needed data was sent!"); else ERROR_WITH_ERRNO("Error reading pipable WIM from pipe"); return ret; } static int read_blobs_from_pipe(struct apply_ctx *ctx, const struct read_blob_callbacks *cbs) { int ret; u8 hash[SHA1_HASH_SIZE]; struct wim_reshdr reshdr; struct wim_header_disk pwm_hdr; struct wim_resource_descriptor rdesc; struct blob_descriptor *blob; copy_guid(ctx->progress.extract.guid, ctx->wim->hdr.guid); ctx->progress.extract.part_number = ctx->wim->hdr.part_number; ctx->progress.extract.total_parts = ctx->wim->hdr.total_parts; ret = extract_progress(ctx, WIMLIB_PROGRESS_MSG_EXTRACT_SPWM_PART_BEGIN); if (ret) return ret; while (ctx->num_blobs_remaining) { ret = read_pwm_blob_header(ctx->wim, hash, &reshdr, &pwm_hdr); if (ret == PWM_FOUND_WIM_HDR) { u16 part_number = le16_to_cpu(pwm_hdr.part_number); u16 total_parts = le16_to_cpu(pwm_hdr.total_parts); if (part_number == ctx->progress.extract.part_number && total_parts == ctx->progress.extract.total_parts && guids_equal(pwm_hdr.guid, ctx->progress.extract.guid)) continue; copy_guid(ctx->progress.extract.guid, pwm_hdr.guid); ctx->progress.extract.part_number = part_number; ctx->progress.extract.total_parts = total_parts; ret = extract_progress(ctx, WIMLIB_PROGRESS_MSG_EXTRACT_SPWM_PART_BEGIN); if (ret) return ret; continue; } if (ret) return ret; if (!(reshdr.flags & WIM_RESHDR_FLAG_METADATA) && (blob = lookup_blob(ctx->wim->blob_table, hash)) && (blob->out_refcnt)) { wim_reshdr_to_desc_and_blob(&reshdr, ctx->wim, &rdesc, blob); ret = read_blob_with_sha1(blob, cbs); blob_unset_is_located_in_wim_resource(blob); if (ret) return ret; ctx->num_blobs_remaining--; } else { wim_reshdr_to_desc(&reshdr, ctx->wim, &rdesc); ret = skip_wim_resource(&rdesc); if (ret) return ret; } } return 0; } /* Creates a temporary file opened for writing. The open file descriptor is * returned in @fd_ret and its name is returned in @name_ret (dynamically * allocated). */ static int create_temporary_file(struct filedes *fd_ret, tchar **name_ret) { tchar *name; int open_flags; int raw_fd; retry: name = ttempnam(NULL, T("wimlib")); if (!name) { ERROR_WITH_ERRNO("Failed to create temporary filename"); return WIMLIB_ERR_NOMEM; } open_flags = O_WRONLY | O_CREAT | O_EXCL | O_BINARY; #ifdef __WIN32__ open_flags |= _O_SHORT_LIVED; #endif raw_fd = topen(name, open_flags, 0600); if (raw_fd < 0) { if (errno == EEXIST) { FREE(name); goto retry; } ERROR_WITH_ERRNO("Failed to create temporary file " "\"%"TS"\"", name); FREE(name); return WIMLIB_ERR_OPEN; } filedes_init(fd_ret, raw_fd); *name_ret = name; return 0; } static int begin_extract_blob_wrapper(struct blob_descriptor *blob, void *_ctx) { struct apply_ctx *ctx = _ctx; ctx->cur_blob = blob; ctx->cur_blob_offset = 0; if (unlikely(blob->out_refcnt > MAX_OPEN_FILES)) return create_temporary_file(&ctx->tmpfile_fd, &ctx->tmpfile_name); return call_begin_blob(blob, ctx->saved_cbs); } static int extract_chunk_wrapper(const void *chunk, size_t size, void *_ctx) { struct apply_ctx *ctx = _ctx; union wimlib_progress_info *progress = &ctx->progress; int ret; ctx->cur_blob_offset += size; if (likely(ctx->supported_features.hard_links)) { progress->extract.completed_bytes += (u64)size * ctx->cur_blob->out_refcnt; if (ctx->cur_blob_offset == ctx->cur_blob->size) progress->extract.completed_streams += ctx->cur_blob->out_refcnt; } else { const struct blob_extraction_target *targets = blob_extraction_targets(ctx->cur_blob); for (u32 i = 0; i < ctx->cur_blob->out_refcnt; i++) { const struct wim_inode *inode = targets[i].inode; const struct wim_dentry *dentry; inode_for_each_extraction_alias(dentry, inode) { progress->extract.completed_bytes += size; if (ctx->cur_blob_offset == ctx->cur_blob->size) progress->extract.completed_streams++; } } } if (progress->extract.completed_bytes >= ctx->next_progress) { ret = extract_progress(ctx, WIMLIB_PROGRESS_MSG_EXTRACT_STREAMS); if (ret) return ret; if (progress->extract.completed_bytes >= progress->extract.total_bytes) { ctx->next_progress = UINT64_MAX; } else { /* Send new message as soon as another 1/128 of the * total has been extracted. (Arbitrary number.) */ ctx->next_progress = progress->extract.completed_bytes + progress->extract.total_bytes / 128; /* ... Unless that would be more than 5000000 bytes, in * which case send the next after the next 5000000 * bytes. (Another arbitrary number.) */ if (progress->extract.completed_bytes + 5000000 < ctx->next_progress) ctx->next_progress = progress->extract.completed_bytes + 5000000; /* ... But always send a message as soon as we're * completely done. */ if (progress->extract.total_bytes < ctx->next_progress) ctx->next_progress = progress->extract.total_bytes; } } if (unlikely(filedes_valid(&ctx->tmpfile_fd))) { /* Just extracting to temporary file for now. */ ret = full_write(&ctx->tmpfile_fd, chunk, size); if (ret) { ERROR_WITH_ERRNO("Error writing data to " "temporary file \"%"TS"\"", ctx->tmpfile_name); } return ret; } return call_consume_chunk(chunk, size, ctx->saved_cbs); } /* Copy the blob's data from the temporary file to each of its targets. * * This is executed only in the very uncommon case that a blob is being * extracted to more than MAX_OPEN_FILES targets! */ static int extract_from_tmpfile(const tchar *tmpfile_name, const struct blob_descriptor *orig_blob, const struct read_blob_callbacks *cbs) { struct blob_descriptor tmpfile_blob; const struct blob_extraction_target *targets = blob_extraction_targets(orig_blob); int ret; memcpy(&tmpfile_blob, orig_blob, sizeof(struct blob_descriptor)); tmpfile_blob.blob_location = BLOB_IN_FILE_ON_DISK; tmpfile_blob.file_on_disk = (tchar *)tmpfile_name; tmpfile_blob.out_refcnt = 1; for (u32 i = 0; i < orig_blob->out_refcnt; i++) { tmpfile_blob.inline_blob_extraction_targets[0] = targets[i]; ret = read_blob_with_cbs(&tmpfile_blob, cbs); if (ret) return ret; } return 0; } static int end_extract_blob_wrapper(struct blob_descriptor *blob, int status, void *_ctx) { struct apply_ctx *ctx = _ctx; if (unlikely(filedes_valid(&ctx->tmpfile_fd))) { filedes_close(&ctx->tmpfile_fd); if (!status) status = extract_from_tmpfile(ctx->tmpfile_name, blob, ctx->saved_cbs); filedes_invalidate(&ctx->tmpfile_fd); tunlink(ctx->tmpfile_name); FREE(ctx->tmpfile_name); return status; } return call_end_blob(blob, status, ctx->saved_cbs); } /* * Read the list of blobs to extract and feed their data into the specified * callback functions. * * This handles checksumming each blob. * * This also handles sending WIMLIB_PROGRESS_MSG_EXTRACT_STREAMS. * * This also works if the WIM is being read from a pipe. * * This also will split up blobs that will need to be extracted to more than * MAX_OPEN_FILES locations, as measured by the 'out_refcnt' of each blob. * Therefore, the apply_operations implementation need not worry about running * out of file descriptors, unless it might open more than one file descriptor * per 'blob_extraction_target' (e.g. Win32 currently might because the * destination file system might not support hard links). */ int extract_blob_list(struct apply_ctx *ctx, const struct read_blob_callbacks *cbs) { struct read_blob_callbacks wrapper_cbs = { .begin_blob = begin_extract_blob_wrapper, .consume_chunk = extract_chunk_wrapper, .end_blob = end_extract_blob_wrapper, .ctx = ctx, }; ctx->saved_cbs = cbs; if (ctx->extract_flags & WIMLIB_EXTRACT_FLAG_FROM_PIPE) { return read_blobs_from_pipe(ctx, &wrapper_cbs); } else { return read_blob_list(&ctx->blob_list, offsetof(struct blob_descriptor, extraction_list), &wrapper_cbs, VERIFY_BLOB_HASHES); } } /* Extract a WIM dentry to standard output. * * This obviously doesn't make sense in all cases. We return an error if the * dentry does not correspond to a regular file. Otherwise we extract the * unnamed data stream only. */ static int extract_dentry_to_stdout(struct wim_dentry *dentry, const struct blob_table *blob_table) { struct wim_inode *inode = dentry->d_inode; struct blob_descriptor *blob; struct filedes _stdout; if (inode->i_attributes & (FILE_ATTRIBUTE_REPARSE_POINT | FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_ENCRYPTED)) { ERROR("\"%"TS"\" is not a regular file and therefore cannot be " "extracted to standard output", dentry_full_path(dentry)); return WIMLIB_ERR_NOT_A_REGULAR_FILE; } blob = inode_get_blob_for_unnamed_data_stream(inode, blob_table); if (!blob) { const u8 *hash = inode_get_hash_of_unnamed_data_stream(inode); if (!is_zero_hash(hash)) return blob_not_found_error(inode, hash); return 0; } filedes_init(&_stdout, STDOUT_FILENO); return extract_blob_to_fd(blob, &_stdout); } static int extract_dentries_to_stdout(struct wim_dentry **dentries, size_t num_dentries, const struct blob_table *blob_table) { for (size_t i = 0; i < num_dentries; i++) { int ret = extract_dentry_to_stdout(dentries[i], blob_table); if (ret) return ret; } return 0; } /**********************************************************************/ /* * Removes duplicate dentries from the array. * * Returns the new number of dentries, packed at the front of the array. */ static size_t remove_duplicate_trees(struct wim_dentry **trees, size_t num_trees) { size_t i, j = 0; for (i = 0; i < num_trees; i++) { if (!trees[i]->tmp_flag) { /* Found distinct dentry. */ trees[i]->tmp_flag = 1; trees[j++] = trees[i]; } } for (i = 0; i < j; i++) trees[i]->tmp_flag = 0; return j; } /* * Remove dentries that are descendants of other dentries in the array. * * Returns the new number of dentries, packed at the front of the array. */ static size_t remove_contained_trees(struct wim_dentry **trees, size_t num_trees) { size_t i, j = 0; for (i = 0; i < num_trees; i++) trees[i]->tmp_flag = 1; for (i = 0; i < num_trees; i++) { struct wim_dentry *d = trees[i]; while (!dentry_is_root(d)) { d = d->d_parent; if (d->tmp_flag) goto tree_contained; } trees[j++] = trees[i]; continue; tree_contained: trees[i]->tmp_flag = 0; } for (i = 0; i < j; i++) trees[i]->tmp_flag = 0; return j; } static int dentry_append_to_list(struct wim_dentry *dentry, void *_dentry_list) { struct list_head *dentry_list = _dentry_list; list_add_tail(&dentry->d_extraction_list_node, dentry_list); return 0; } static void dentry_reset_extraction_list_node(struct wim_dentry *dentry) { dentry->d_extraction_list_node = (struct list_head){NULL, NULL}; } static int dentry_delete_from_list(struct wim_dentry *dentry, void *_ignore) { list_del(&dentry->d_extraction_list_node); dentry_reset_extraction_list_node(dentry); return 0; } /* * Build the preliminary list of dentries to be extracted. * * The list maintains the invariant that if d1 and d2 are in the list and d1 is * an ancestor of d2, then d1 appears before d2 in the list. */ static void build_dentry_list(struct list_head *dentry_list, struct wim_dentry **trees, size_t num_trees, bool add_ancestors) { INIT_LIST_HEAD(dentry_list); /* Add the trees recursively. */ for (size_t i = 0; i < num_trees; i++) for_dentry_in_tree(trees[i], dentry_append_to_list, dentry_list); /* If requested, add ancestors of the trees. */ if (add_ancestors) { for (size_t i = 0; i < num_trees; i++) { struct wim_dentry *dentry = trees[i]; struct wim_dentry *ancestor; struct list_head *place_after; if (dentry_is_root(dentry)) continue; place_after = dentry_list; ancestor = dentry; do { ancestor = ancestor->d_parent; if (will_extract_dentry(ancestor)) { place_after = &ancestor->d_extraction_list_node; break; } } while (!dentry_is_root(ancestor)); ancestor = dentry; do { ancestor = ancestor->d_parent; if (will_extract_dentry(ancestor)) break; list_add(&ancestor->d_extraction_list_node, place_after); } while (!dentry_is_root(ancestor)); } } } static void destroy_dentry_list(struct list_head *dentry_list) { struct wim_dentry *dentry, *tmp; struct wim_inode *inode; list_for_each_entry_safe(dentry, tmp, dentry_list, d_extraction_list_node) { inode = dentry->d_inode; dentry_reset_extraction_list_node(dentry); inode->i_visited = 0; inode->i_can_externally_back = 0; if ((void *)dentry->d_extraction_name != (void *)dentry->file_name) FREE(dentry->d_extraction_name); dentry->d_extraction_name = NULL; dentry->d_extraction_name_nchars = 0; } } static void destroy_blob_list(struct list_head *blob_list) { struct blob_descriptor *blob; list_for_each_entry(blob, blob_list, extraction_list) if (blob->out_refcnt > ARRAY_LEN(blob->inline_blob_extraction_targets)) FREE(blob->blob_extraction_targets); } #ifdef __WIN32__ static const utf16lechar replacement_char = cpu_to_le16(0xfffd); #else static const utf16lechar replacement_char = cpu_to_le16('?'); #endif static bool file_name_valid(utf16lechar *name, size_t num_chars, bool fix) { size_t i; if (num_chars == 0) return true; for (i = 0; i < num_chars; i++) { switch (name[i]) { #ifdef __WIN32__ case cpu_to_le16('\\'): case cpu_to_le16(':'): case cpu_to_le16('*'): case cpu_to_le16('?'): case cpu_to_le16('"'): case cpu_to_le16('<'): case cpu_to_le16('>'): case cpu_to_le16('|'): #endif case cpu_to_le16('/'): case cpu_to_le16('\0'): if (fix) name[i] = replacement_char; else return false; } } #ifdef __WIN32__ if (name[num_chars - 1] == cpu_to_le16(' ') || name[num_chars - 1] == cpu_to_le16('.')) { if (fix) name[num_chars - 1] = replacement_char; else return false; } #endif return true; } static int dentry_calculate_extraction_name(struct wim_dentry *dentry, struct apply_ctx *ctx) { int ret; if (dentry_is_root(dentry)) return 0; #ifdef WITH_NTFS_3G if (ctx->extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) { dentry->d_extraction_name = dentry->file_name; dentry->d_extraction_name_nchars = dentry->file_name_nbytes / sizeof(utf16lechar); return 0; } #endif if (!ctx->supported_features.case_sensitive_filenames) { struct wim_dentry *other; list_for_each_entry(other, &dentry->d_ci_conflict_list, d_ci_conflict_list) { if (will_extract_dentry(other)) { if (ctx->extract_flags & WIMLIB_EXTRACT_FLAG_ALL_CASE_CONFLICTS) { WARNING("\"%"TS"\" has the same " "case-insensitive name as " "\"%"TS"\"; extracting " "dummy name instead", dentry_full_path(dentry), dentry_full_path(other)); goto out_replace; } else { WARNING("Not extracting \"%"TS"\": " "has same case-insensitive " "name as \"%"TS"\"", dentry_full_path(dentry), dentry_full_path(other)); goto skip_dentry; } } } } if (file_name_valid(dentry->file_name, dentry->file_name_nbytes / 2, false)) { ret = utf16le_get_tstr(dentry->file_name, dentry->file_name_nbytes, (const tchar **)&dentry->d_extraction_name, &dentry->d_extraction_name_nchars); dentry->d_extraction_name_nchars /= sizeof(tchar); return ret; } else { if (ctx->extract_flags & WIMLIB_EXTRACT_FLAG_REPLACE_INVALID_FILENAMES) { WARNING("\"%"TS"\" has an invalid filename " "that is not supported on this platform; " "extracting dummy name instead", dentry_full_path(dentry)); goto out_replace; } else { WARNING("Not extracting \"%"TS"\": has an invalid filename " "that is not supported on this platform", dentry_full_path(dentry)); goto skip_dentry; } } out_replace: { utf16lechar utf16_name_copy[dentry->file_name_nbytes / 2]; memcpy(utf16_name_copy, dentry->file_name, dentry->file_name_nbytes); file_name_valid(utf16_name_copy, dentry->file_name_nbytes / 2, true); const tchar *tchar_name; size_t tchar_nchars; ret = utf16le_get_tstr(utf16_name_copy, dentry->file_name_nbytes, &tchar_name, &tchar_nchars); if (ret) return ret; tchar_nchars /= sizeof(tchar); size_t fixed_name_num_chars = tchar_nchars; tchar fixed_name[tchar_nchars + 50]; tmemcpy(fixed_name, tchar_name, tchar_nchars); fixed_name_num_chars += tsprintf(fixed_name + tchar_nchars, T(" (invalid filename #%lu)"), ++ctx->invalid_sequence); utf16le_put_tstr(tchar_name); dentry->d_extraction_name = TSTRDUP(fixed_name); if (!dentry->d_extraction_name) return WIMLIB_ERR_NOMEM; dentry->d_extraction_name_nchars = fixed_name_num_chars; } return 0; skip_dentry: for_dentry_in_tree(dentry, dentry_delete_from_list, NULL); return 0; } /* * Calculate the actual filename component at which each WIM dentry will be * extracted, with special handling for dentries that are unsupported by the * extraction backend or have invalid names. * * ctx->supported_features must be filled in. * * Possible error codes: WIMLIB_ERR_NOMEM, WIMLIB_ERR_INVALID_UTF16_STRING */ static int dentry_list_calculate_extraction_names(struct list_head *dentry_list, struct apply_ctx *ctx) { struct list_head *prev, *cur; /* Can't use list_for_each_entry() because a call to * dentry_calculate_extraction_name() may delete the current dentry and * its children from the list. */ prev = dentry_list; for (;;) { struct wim_dentry *dentry; int ret; cur = prev->next; if (cur == dentry_list) break; dentry = list_entry(cur, struct wim_dentry, d_extraction_list_node); ret = dentry_calculate_extraction_name(dentry, ctx); if (ret) return ret; if (prev->next == cur) prev = cur; else ; /* Current dentry and its children (which follow in the list) were deleted. prev stays the same. */ } return 0; } static int dentry_resolve_streams(struct wim_dentry *dentry, int extract_flags, struct blob_table *blob_table) { struct wim_inode *inode = dentry->d_inode; struct blob_descriptor *blob; int ret; bool force = false; /* Special case: when extracting from a pipe, the WIM blob table is * initially empty, so "resolving" an inode's streams is initially not * possible. However, we still need to keep track of which blobs, * identified by SHA-1 message digests, need to be extracted, so we * "resolve" the inode's streams anyway by allocating a 'struct * blob_descriptor' for each one. */ if (extract_flags & WIMLIB_EXTRACT_FLAG_FROM_PIPE) force = true; ret = inode_resolve_streams(inode, blob_table, force); if (ret) return ret; for (unsigned i = 0; i < inode->i_num_streams; i++) { blob = stream_blob_resolved(&inode->i_streams[i]); if (blob) blob->out_refcnt = 0; } return 0; } /* * For each dentry to be extracted, resolve all streams in the corresponding * inode and set 'out_refcnt' in all referenced blob_descriptors to 0. * * Possible error codes: WIMLIB_ERR_RESOURCE_NOT_FOUND, WIMLIB_ERR_NOMEM. */ static int dentry_list_resolve_streams(struct list_head *dentry_list, struct apply_ctx *ctx) { struct wim_dentry *dentry; int ret; list_for_each_entry(dentry, dentry_list, d_extraction_list_node) { ret = dentry_resolve_streams(dentry, ctx->extract_flags, ctx->wim->blob_table); if (ret) return ret; } return 0; } static int ref_stream(struct wim_inode_stream *strm, struct wim_dentry *dentry, struct apply_ctx *ctx) { struct wim_inode *inode = dentry->d_inode; struct blob_descriptor *blob = stream_blob_resolved(strm); struct blob_extraction_target *targets; if (!blob) return 0; /* Tally the size only for each actual extraction of the stream (not * additional hard links to the inode). */ if (inode->i_visited && ctx->supported_features.hard_links) return 0; ctx->progress.extract.total_bytes += blob->size; ctx->progress.extract.total_streams++; if (inode->i_visited) return 0; /* Add each blob to 'ctx->blob_list' only one time, regardless of how * many extraction targets it will have. */ if (blob->out_refcnt == 0) { list_add_tail(&blob->extraction_list, &ctx->blob_list); ctx->num_blobs_remaining++; } /* Set this stream as an extraction target of 'blob'. */ if (blob->out_refcnt < ARRAY_LEN(blob->inline_blob_extraction_targets)) { targets = blob->inline_blob_extraction_targets; } else { struct blob_extraction_target *prev_targets; size_t alloc_blob_extraction_targets; if (blob->out_refcnt == ARRAY_LEN(blob->inline_blob_extraction_targets)) { prev_targets = NULL; alloc_blob_extraction_targets = ARRAY_LEN(blob->inline_blob_extraction_targets); } else { prev_targets = blob->blob_extraction_targets; alloc_blob_extraction_targets = blob->alloc_blob_extraction_targets; } if (blob->out_refcnt == alloc_blob_extraction_targets) { alloc_blob_extraction_targets *= 2; targets = REALLOC(prev_targets, alloc_blob_extraction_targets * sizeof(targets[0])); if (!targets) return WIMLIB_ERR_NOMEM; if (!prev_targets) { memcpy(targets, blob->inline_blob_extraction_targets, sizeof(blob->inline_blob_extraction_targets)); } blob->blob_extraction_targets = targets; blob->alloc_blob_extraction_targets = alloc_blob_extraction_targets; } targets = blob->blob_extraction_targets; } targets[blob->out_refcnt].inode = inode; targets[blob->out_refcnt].stream = strm; blob->out_refcnt++; return 0; } static int ref_stream_if_needed(struct wim_dentry *dentry, struct wim_inode *inode, struct wim_inode_stream *strm, struct apply_ctx *ctx) { bool need_stream = false; switch (strm->stream_type) { case STREAM_TYPE_DATA: if (stream_is_named(strm)) { /* Named data stream */ if (ctx->supported_features.named_data_streams) need_stream = true; } else if (!(inode->i_attributes & (FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_ENCRYPTED)) && !(inode_is_symlink(inode) && !ctx->supported_features.reparse_points && ctx->supported_features.symlink_reparse_points)) { /* * Unnamed data stream. Skip if any of the following is true: * * - file is a directory * - file is encrypted * - backend needs to create the file as UNIX symlink * - backend will extract the stream as externally backed */ if (ctx->apply_ops->will_externally_back) { int ret = (*ctx->apply_ops->will_externally_back)(dentry, ctx); if (ret > 0) /* Error? */ return ret; if (ret < 0) /* Won't externally back? */ need_stream = true; } else { need_stream = true; } } break; case STREAM_TYPE_REPARSE_POINT: wimlib_assert(inode->i_attributes & FILE_ATTRIBUTE_REPARSE_POINT); if (ctx->supported_features.reparse_points || (inode_is_symlink(inode) && ctx->supported_features.symlink_reparse_points)) need_stream = true; break; case STREAM_TYPE_EFSRPC_RAW_DATA: wimlib_assert(inode->i_attributes & FILE_ATTRIBUTE_ENCRYPTED); if (inode->i_attributes & FILE_ATTRIBUTE_DIRECTORY) { if (ctx->supported_features.encrypted_directories) need_stream = true; } else { if (ctx->supported_features.encrypted_files) need_stream = true; } break; } if (need_stream) return ref_stream(strm, dentry, ctx); return 0; } static int dentry_ref_streams(struct wim_dentry *dentry, struct apply_ctx *ctx) { struct wim_inode *inode = dentry->d_inode; for (unsigned i = 0; i < inode->i_num_streams; i++) { int ret = ref_stream_if_needed(dentry, inode, &inode->i_streams[i], ctx); if (ret) return ret; } inode->i_visited = 1; return 0; } /* * Given a list of dentries to be extracted, build the list of blobs that need * to be extracted, and for each blob determine the streams to which that blob * will be extracted. * * This also initializes the extract progress info with byte and blob * information. * * ctx->supported_features must be filled in. */ static int dentry_list_ref_streams(struct list_head *dentry_list, struct apply_ctx *ctx) { struct wim_dentry *dentry; int ret; list_for_each_entry(dentry, dentry_list, d_extraction_list_node) { ret = dentry_ref_streams(dentry, ctx); if (ret) return ret; } list_for_each_entry(dentry, dentry_list, d_extraction_list_node) dentry->d_inode->i_visited = 0; return 0; } static void dentry_list_build_inode_alias_lists(struct list_head *dentry_list) { struct wim_dentry *dentry; struct wim_inode *inode; list_for_each_entry(dentry, dentry_list, d_extraction_list_node) { inode = dentry->d_inode; if (!inode->i_visited) INIT_LIST_HEAD(&inode->i_extraction_aliases); list_add_tail(&dentry->d_extraction_alias_node, &inode->i_extraction_aliases); inode->i_visited = 1; } list_for_each_entry(dentry, dentry_list, d_extraction_list_node) dentry->d_inode->i_visited = 0; } static void inode_tally_features(const struct wim_inode *inode, struct wim_features *features) { if (inode->i_attributes & FILE_ATTRIBUTE_ARCHIVE) features->archive_files++; if (inode->i_attributes & FILE_ATTRIBUTE_HIDDEN) features->hidden_files++; if (inode->i_attributes & FILE_ATTRIBUTE_SYSTEM) features->system_files++; if (inode->i_attributes & FILE_ATTRIBUTE_COMPRESSED) features->compressed_files++; if (inode->i_attributes & FILE_ATTRIBUTE_ENCRYPTED) { if (inode->i_attributes & FILE_ATTRIBUTE_DIRECTORY) features->encrypted_directories++; else features->encrypted_files++; } if (inode->i_attributes & FILE_ATTRIBUTE_NOT_CONTENT_INDEXED) features->not_context_indexed_files++; if (inode->i_attributes & FILE_ATTRIBUTE_SPARSE_FILE) features->sparse_files++; if (inode_has_named_data_stream(inode)) features->named_data_streams++; if (inode->i_attributes & FILE_ATTRIBUTE_REPARSE_POINT) { features->reparse_points++; if (inode_is_symlink(inode)) features->symlink_reparse_points++; else features->other_reparse_points++; } if (inode_has_security_descriptor(inode)) features->security_descriptors++; if (inode_has_unix_data(inode)) features->unix_data++; } /* Tally features necessary to extract a dentry and the corresponding inode. */ static void dentry_tally_features(struct wim_dentry *dentry, struct wim_features *features) { struct wim_inode *inode = dentry->d_inode; if (dentry_has_short_name(dentry)) features->short_names++; if (inode->i_visited) { features->hard_links++; } else { inode_tally_features(inode, features); inode->i_visited = 1; } } /* Tally the features necessary to extract the specified dentries. */ static void dentry_list_get_features(struct list_head *dentry_list, struct wim_features *features) { struct wim_dentry *dentry; list_for_each_entry(dentry, dentry_list, d_extraction_list_node) dentry_tally_features(dentry, features); list_for_each_entry(dentry, dentry_list, d_extraction_list_node) dentry->d_inode->i_visited = 0; } static int do_feature_check(const struct wim_features *required_features, const struct wim_features *supported_features, int extract_flags) { /* Encrypted files. */ if (required_features->encrypted_files && !supported_features->encrypted_files) WARNING("Ignoring EFS-encrypted data of %lu files", required_features->encrypted_files); /* Named data streams. */ if (required_features->named_data_streams && !supported_features->named_data_streams) WARNING("Ignoring named data streams of %lu files", required_features->named_data_streams); /* File attributes. */ if (!(extract_flags & WIMLIB_EXTRACT_FLAG_NO_ATTRIBUTES)) { /* Note: Don't bother the user about FILE_ATTRIBUTE_ARCHIVE. * We're an archive program, so theoretically we can do what we * want with it. */ if (required_features->hidden_files && !supported_features->hidden_files) WARNING("Ignoring FILE_ATTRIBUTE_HIDDEN of %lu files", required_features->hidden_files); if (required_features->system_files && !supported_features->system_files) WARNING("Ignoring FILE_ATTRIBUTE_SYSTEM of %lu files", required_features->system_files); if (required_features->compressed_files && !supported_features->compressed_files) WARNING("Ignoring FILE_ATTRIBUTE_COMPRESSED of %lu files", required_features->compressed_files); if (required_features->not_context_indexed_files && !supported_features->not_context_indexed_files) WARNING("Ignoring FILE_ATTRIBUTE_NOT_CONTENT_INDEXED of %lu files", required_features->not_context_indexed_files); if (required_features->sparse_files && !supported_features->sparse_files) WARNING("Ignoring FILE_ATTRIBUTE_SPARSE_FILE of %lu files", required_features->sparse_files); if (required_features->encrypted_directories && !supported_features->encrypted_directories) WARNING("Ignoring FILE_ATTRIBUTE_ENCRYPTED of %lu directories", required_features->encrypted_directories); } /* Hard links. */ if (required_features->hard_links && !supported_features->hard_links) WARNING("Extracting %lu hard links as independent files", required_features->hard_links); /* Symbolic links and reparse points. */ if ((extract_flags & WIMLIB_EXTRACT_FLAG_STRICT_SYMLINKS) && required_features->symlink_reparse_points && !supported_features->symlink_reparse_points && !supported_features->reparse_points) { ERROR("Extraction backend does not support symbolic links!"); return WIMLIB_ERR_UNSUPPORTED; } if (required_features->reparse_points && !supported_features->reparse_points) { if (supported_features->symlink_reparse_points) { if (required_features->other_reparse_points) { WARNING("Ignoring reparse data of %lu non-symlink/junction files", required_features->other_reparse_points); } } else { WARNING("Ignoring reparse data of %lu files", required_features->reparse_points); } } /* Security descriptors. */ if (((extract_flags & (WIMLIB_EXTRACT_FLAG_STRICT_ACLS | WIMLIB_EXTRACT_FLAG_UNIX_DATA)) == WIMLIB_EXTRACT_FLAG_STRICT_ACLS) && required_features->security_descriptors && !supported_features->security_descriptors) { ERROR("Extraction backend does not support security descriptors!"); return WIMLIB_ERR_UNSUPPORTED; } if (!(extract_flags & WIMLIB_EXTRACT_FLAG_NO_ACLS) && required_features->security_descriptors && !supported_features->security_descriptors) WARNING("Ignoring Windows NT security descriptors of %lu files", required_features->security_descriptors); /* UNIX data. */ if ((extract_flags & WIMLIB_EXTRACT_FLAG_UNIX_DATA) && required_features->unix_data && !supported_features->unix_data) { ERROR("Extraction backend does not support UNIX data!"); return WIMLIB_ERR_UNSUPPORTED; } if (required_features->unix_data && !(extract_flags & WIMLIB_EXTRACT_FLAG_UNIX_DATA)) { WARNING("Ignoring UNIX metadata of %lu files", required_features->unix_data); } /* DOS Names. */ if (required_features->short_names && !supported_features->short_names) { if (extract_flags & WIMLIB_EXTRACT_FLAG_STRICT_SHORT_NAMES) { ERROR("Extraction backend does not support DOS names!"); return WIMLIB_ERR_UNSUPPORTED; } WARNING("Ignoring DOS names of %lu files", required_features->short_names); } /* Timestamps. */ if ((extract_flags & WIMLIB_EXTRACT_FLAG_STRICT_TIMESTAMPS) && !supported_features->timestamps) { ERROR("Extraction backend does not support timestamps!"); return WIMLIB_ERR_UNSUPPORTED; } return 0; } static const struct apply_operations * select_apply_operations(int extract_flags) { #ifdef WITH_NTFS_3G if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) return &ntfs_3g_apply_ops; #endif #ifdef __WIN32__ return &win32_apply_ops; #else return &unix_apply_ops; #endif } static int extract_trees(WIMStruct *wim, struct wim_dentry **trees, size_t num_trees, const tchar *target, int extract_flags) { const struct apply_operations *ops; struct apply_ctx *ctx; int ret; LIST_HEAD(dentry_list); if (extract_flags & WIMLIB_EXTRACT_FLAG_TO_STDOUT) { ret = extract_dentries_to_stdout(trees, num_trees, wim->blob_table); goto out; } num_trees = remove_duplicate_trees(trees, num_trees); num_trees = remove_contained_trees(trees, num_trees); ops = select_apply_operations(extract_flags); if (num_trees > 1 && ops->single_tree_only) { ERROR("Extracting multiple directory trees " "at once is not supported in %s extraction mode!", ops->name); ret = WIMLIB_ERR_UNSUPPORTED; goto out; } ctx = CALLOC(1, ops->context_size); if (!ctx) { ret = WIMLIB_ERR_NOMEM; goto out; } ctx->wim = wim; ctx->target = target; ctx->target_nchars = tstrlen(target); ctx->extract_flags = extract_flags; if (ctx->wim->progfunc) { ctx->progfunc = ctx->wim->progfunc; ctx->progctx = ctx->wim->progctx; ctx->progress.extract.image = wim->current_image; ctx->progress.extract.extract_flags = (extract_flags & WIMLIB_EXTRACT_MASK_PUBLIC); ctx->progress.extract.wimfile_name = wim->filename; ctx->progress.extract.image_name = wimlib_get_image_name(wim, wim->current_image); ctx->progress.extract.target = target; } INIT_LIST_HEAD(&ctx->blob_list); filedes_invalidate(&ctx->tmpfile_fd); ctx->apply_ops = ops; ret = (*ops->get_supported_features)(target, &ctx->supported_features); if (ret) goto out_cleanup; build_dentry_list(&dentry_list, trees, num_trees, !(extract_flags & WIMLIB_EXTRACT_FLAG_NO_PRESERVE_DIR_STRUCTURE)); dentry_list_get_features(&dentry_list, &ctx->required_features); ret = do_feature_check(&ctx->required_features, &ctx->supported_features, ctx->extract_flags); if (ret) goto out_cleanup; ret = dentry_list_calculate_extraction_names(&dentry_list, ctx); if (ret) goto out_cleanup; if (unlikely(list_empty(&dentry_list))) { WARNING("There is nothing to extract!"); goto out_cleanup; } ret = dentry_list_resolve_streams(&dentry_list, ctx); if (ret) goto out_cleanup; dentry_list_build_inode_alias_lists(&dentry_list); ret = dentry_list_ref_streams(&dentry_list, ctx); if (ret) goto out_cleanup; if (extract_flags & WIMLIB_EXTRACT_FLAG_FROM_PIPE) { /* When extracting from a pipe, the number of bytes of data to * extract can't be determined in the normal way (examining the * blob table), since at this point all we have is a set of * SHA-1 message digests of blobs that need to be extracted. * However, we can get a reasonably accurate estimate by taking * from the corresponding in the WIM XML * data. This does assume that a full image is being extracted, * but currently there is no API for doing otherwise. (Also, * subtract from this if hard links are * supported by the extraction mode.) */ ctx->progress.extract.total_bytes = wim_info_get_image_total_bytes(wim->wim_info, wim->current_image); if (ctx->supported_features.hard_links) { ctx->progress.extract.total_bytes -= wim_info_get_image_hard_link_bytes(wim->wim_info, wim->current_image); } } ret = extract_progress(ctx, ((extract_flags & WIMLIB_EXTRACT_FLAG_IMAGEMODE) ? WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_BEGIN : WIMLIB_PROGRESS_MSG_EXTRACT_TREE_BEGIN)); if (ret) goto out_cleanup; ret = (*ops->extract)(&dentry_list, ctx); if (ret) goto out_cleanup; if (ctx->progress.extract.completed_bytes < ctx->progress.extract.total_bytes) { ctx->progress.extract.completed_bytes = ctx->progress.extract.total_bytes; ret = extract_progress(ctx, WIMLIB_PROGRESS_MSG_EXTRACT_STREAMS); if (ret) goto out_cleanup; } ret = extract_progress(ctx, ((extract_flags & WIMLIB_EXTRACT_FLAG_IMAGEMODE) ? WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_END : WIMLIB_PROGRESS_MSG_EXTRACT_TREE_END)); out_cleanup: destroy_blob_list(&ctx->blob_list); destroy_dentry_list(&dentry_list); FREE(ctx); out: return ret; } static int mkdir_if_needed(const tchar *target) { if (!tmkdir(target, 0755)) return 0; if (errno == EEXIST) return 0; #ifdef __WIN32__ /* _wmkdir() fails with EACCES if called on a drive root directory. */ if (errno == EACCES) return 0; #endif ERROR_WITH_ERRNO("Failed to create directory \"%"TS"\"", target); return WIMLIB_ERR_MKDIR; } /* Make sure the extraction flags make sense, and update them if needed. */ static int check_extract_flags(const WIMStruct *wim, int *extract_flags_p) { int extract_flags = *extract_flags_p; /* Check for invalid flag combinations */ if ((extract_flags & (WIMLIB_EXTRACT_FLAG_NO_ACLS | WIMLIB_EXTRACT_FLAG_STRICT_ACLS)) == (WIMLIB_EXTRACT_FLAG_NO_ACLS | WIMLIB_EXTRACT_FLAG_STRICT_ACLS)) return WIMLIB_ERR_INVALID_PARAM; if ((extract_flags & (WIMLIB_EXTRACT_FLAG_RPFIX | WIMLIB_EXTRACT_FLAG_NORPFIX)) == (WIMLIB_EXTRACT_FLAG_RPFIX | WIMLIB_EXTRACT_FLAG_NORPFIX)) return WIMLIB_ERR_INVALID_PARAM; #ifndef WITH_NTFS_3G if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) { ERROR("wimlib was compiled without support for NTFS-3g, so\n" " it cannot apply a WIM image directly to an NTFS volume."); return WIMLIB_ERR_UNSUPPORTED; } #endif if (extract_flags & WIMLIB_EXTRACT_FLAG_WIMBOOT) { #ifdef __WIN32__ if (!wim->filename) return WIMLIB_ERR_NO_FILENAME; #else ERROR("WIMBoot extraction is only supported on Windows!"); return WIMLIB_ERR_UNSUPPORTED; #endif } if ((extract_flags & (WIMLIB_EXTRACT_FLAG_RPFIX | WIMLIB_EXTRACT_FLAG_NORPFIX | WIMLIB_EXTRACT_FLAG_IMAGEMODE)) == WIMLIB_EXTRACT_FLAG_IMAGEMODE) { /* For full-image extraction, do reparse point fixups by default * if the WIM header says they are enabled. */ if (wim->hdr.flags & WIM_HDR_FLAG_RP_FIX) extract_flags |= WIMLIB_EXTRACT_FLAG_RPFIX; } *extract_flags_p = extract_flags; return 0; } static u32 get_wildcard_flags(int extract_flags) { u32 wildcard_flags = 0; if (extract_flags & WIMLIB_EXTRACT_FLAG_STRICT_GLOB) wildcard_flags |= WILDCARD_FLAG_ERROR_IF_NO_MATCH; else wildcard_flags |= WILDCARD_FLAG_WARN_IF_NO_MATCH; if (default_ignore_case) wildcard_flags |= WILDCARD_FLAG_CASE_INSENSITIVE; return wildcard_flags; } struct append_dentry_ctx { struct wim_dentry **dentries; size_t num_dentries; size_t num_alloc_dentries; }; static int append_dentry_cb(struct wim_dentry *dentry, void *_ctx) { struct append_dentry_ctx *ctx = _ctx; if (ctx->num_dentries == ctx->num_alloc_dentries) { struct wim_dentry **new_dentries; size_t new_length; new_length = max(ctx->num_alloc_dentries + 8, ctx->num_alloc_dentries * 3 / 2); new_dentries = REALLOC(ctx->dentries, new_length * sizeof(ctx->dentries[0])); if (new_dentries == NULL) return WIMLIB_ERR_NOMEM; ctx->dentries = new_dentries; ctx->num_alloc_dentries = new_length; } ctx->dentries[ctx->num_dentries++] = dentry; return 0; } static int do_wimlib_extract_paths(WIMStruct *wim, int image, const tchar *target, const tchar * const *paths, size_t num_paths, int extract_flags) { int ret; struct wim_dentry **trees; size_t num_trees; if (wim == NULL || target == NULL || target[0] == T('\0') || (num_paths != 0 && paths == NULL)) return WIMLIB_ERR_INVALID_PARAM; ret = check_extract_flags(wim, &extract_flags); if (ret) return ret; ret = select_wim_image(wim, image); if (ret) return ret; ret = wim_checksum_unhashed_blobs(wim); if (ret) return ret; if ((extract_flags & (WIMLIB_EXTRACT_FLAG_NTFS | WIMLIB_EXTRACT_FLAG_NO_PRESERVE_DIR_STRUCTURE)) == (WIMLIB_EXTRACT_FLAG_NO_PRESERVE_DIR_STRUCTURE)) { ret = mkdir_if_needed(target); if (ret) return ret; } if (extract_flags & WIMLIB_EXTRACT_FLAG_GLOB_PATHS) { struct append_dentry_ctx append_dentry_ctx = { .dentries = NULL, .num_dentries = 0, .num_alloc_dentries = 0, }; u32 wildcard_flags = get_wildcard_flags(extract_flags); for (size_t i = 0; i < num_paths; i++) { tchar *path = canonicalize_wim_path(paths[i]); if (path == NULL) { ret = WIMLIB_ERR_NOMEM; trees = append_dentry_ctx.dentries; goto out_free_trees; } ret = expand_wildcard(wim, path, append_dentry_cb, &append_dentry_ctx, wildcard_flags); FREE(path); if (ret) { trees = append_dentry_ctx.dentries; goto out_free_trees; } } trees = append_dentry_ctx.dentries; num_trees = append_dentry_ctx.num_dentries; } else { trees = MALLOC(num_paths * sizeof(trees[0])); if (trees == NULL) return WIMLIB_ERR_NOMEM; for (size_t i = 0; i < num_paths; i++) { tchar *path = canonicalize_wim_path(paths[i]); if (path == NULL) { ret = WIMLIB_ERR_NOMEM; goto out_free_trees; } trees[i] = get_dentry(wim, path, WIMLIB_CASE_PLATFORM_DEFAULT); FREE(path); if (trees[i] == NULL) { ERROR("Path \"%"TS"\" does not exist " "in WIM image %d", paths[i], wim->current_image); ret = WIMLIB_ERR_PATH_DOES_NOT_EXIST; goto out_free_trees; } } num_trees = num_paths; } if (num_trees == 0) { ret = 0; goto out_free_trees; } ret = extract_trees(wim, trees, num_trees, target, extract_flags); out_free_trees: FREE(trees); return ret; } static int extract_single_image(WIMStruct *wim, int image, const tchar *target, int extract_flags) { const tchar *path = WIMLIB_WIM_ROOT_PATH; extract_flags |= WIMLIB_EXTRACT_FLAG_IMAGEMODE; return do_wimlib_extract_paths(wim, image, target, &path, 1, extract_flags); } static const tchar * const filename_forbidden_chars = T( #ifdef __WIN32__ "<>:\"/\\|?*" #else "/" #endif ); /* This function checks if it is okay to use a WIM image's name as a directory * name. */ static bool image_name_ok_as_dir(const tchar *image_name) { return image_name && *image_name && !tstrpbrk(image_name, filename_forbidden_chars) && tstrcmp(image_name, T(".")) && tstrcmp(image_name, T("..")); } /* Extracts all images from the WIM to the directory @target, with the images * placed in subdirectories named by their image names. */ static int extract_all_images(WIMStruct *wim, const tchar *target, int extract_flags) { size_t image_name_max_len = max(xml_get_max_image_name_len(wim), 20); size_t output_path_len = tstrlen(target); tchar buf[output_path_len + 1 + image_name_max_len + 1]; int ret; int image; const tchar *image_name; if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) { ERROR("Cannot extract multiple images in NTFS extraction mode."); return WIMLIB_ERR_INVALID_PARAM; } ret = mkdir_if_needed(target); if (ret) return ret; tmemcpy(buf, target, output_path_len); buf[output_path_len] = OS_PREFERRED_PATH_SEPARATOR; for (image = 1; image <= wim->hdr.image_count; image++) { image_name = wimlib_get_image_name(wim, image); if (image_name_ok_as_dir(image_name)) { tstrcpy(buf + output_path_len + 1, image_name); } else { /* Image name is empty or contains forbidden characters. * Use image number instead. */ tsprintf(buf + output_path_len + 1, T("%d"), image); } ret = extract_single_image(wim, image, buf, extract_flags); if (ret) return ret; } return 0; } static int do_wimlib_extract_image(WIMStruct *wim, int image, const tchar *target, int extract_flags) { if (extract_flags & (WIMLIB_EXTRACT_FLAG_NO_PRESERVE_DIR_STRUCTURE | WIMLIB_EXTRACT_FLAG_TO_STDOUT | WIMLIB_EXTRACT_FLAG_GLOB_PATHS)) return WIMLIB_ERR_INVALID_PARAM; if (image == WIMLIB_ALL_IMAGES) return extract_all_images(wim, target, extract_flags); else return extract_single_image(wim, image, target, extract_flags); } /**************************************************************************** * Extraction API * ****************************************************************************/ WIMLIBAPI int wimlib_extract_paths(WIMStruct *wim, int image, const tchar *target, const tchar * const *paths, size_t num_paths, int extract_flags) { if (extract_flags & ~WIMLIB_EXTRACT_MASK_PUBLIC) return WIMLIB_ERR_INVALID_PARAM; return do_wimlib_extract_paths(wim, image, target, paths, num_paths, extract_flags); } WIMLIBAPI int wimlib_extract_pathlist(WIMStruct *wim, int image, const tchar *target, const tchar *path_list_file, int extract_flags) { int ret; tchar **paths; size_t num_paths; void *mem; ret = read_path_list_file(path_list_file, &paths, &num_paths, &mem); if (ret) { ERROR("Failed to read path list file \"%"TS"\"", path_list_file); return ret; } ret = wimlib_extract_paths(wim, image, target, (const tchar * const *)paths, num_paths, extract_flags); FREE(paths); FREE(mem); return ret; } WIMLIBAPI int wimlib_extract_image_from_pipe_with_progress(int pipe_fd, const tchar *image_num_or_name, const tchar *target, int extract_flags, wimlib_progress_func_t progfunc, void *progctx) { int ret; WIMStruct *pwm; struct filedes *in_fd; int image; unsigned i; if (extract_flags & ~WIMLIB_EXTRACT_MASK_PUBLIC) return WIMLIB_ERR_INVALID_PARAM; /* Read the WIM header from the pipe and get a WIMStruct to represent * the pipable WIM. Caveats: Unlike getting a WIMStruct with * wimlib_open_wim(), getting a WIMStruct in this way will result in an * empty blob table, no XML data read, and no filename set. */ ret = open_wim_as_WIMStruct(&pipe_fd, WIMLIB_OPEN_FLAG_FROM_PIPE, &pwm, progfunc, progctx); if (ret) return ret; /* Sanity check to make sure this is a pipable WIM. */ if (pwm->hdr.magic != PWM_MAGIC) { ERROR("The WIM being read from file descriptor %d " "is not pipable!", pipe_fd); ret = WIMLIB_ERR_NOT_PIPABLE; goto out_wimlib_free; } /* Sanity check to make sure the first part of a pipable split WIM is * sent over the pipe first. */ if (pwm->hdr.part_number != 1) { ERROR("The first part of the split WIM must be " "sent over the pipe first."); ret = WIMLIB_ERR_INVALID_PIPABLE_WIM; goto out_wimlib_free; } in_fd = &pwm->in_fd; wimlib_assert(in_fd->offset == WIM_HEADER_DISK_SIZE); /* As mentioned, the WIMStruct we created from the pipe does not have * XML data yet. Fix this by reading the extra copy of the XML data * that directly follows the header in pipable WIMs. (Note: see * write_pipable_wim() for more details about the format of pipable * WIMs.) */ { u8 hash[SHA1_HASH_SIZE]; ret = read_pwm_blob_header(pwm, hash, &pwm->hdr.xml_data_reshdr, NULL); if (ret) goto out_wimlib_free; if (!(pwm->hdr.xml_data_reshdr.flags & WIM_RESHDR_FLAG_METADATA)) { ERROR("Expected XML data, but found non-metadata resource."); ret = WIMLIB_ERR_INVALID_PIPABLE_WIM; goto out_wimlib_free; } ret = read_wim_xml_data(pwm); if (ret) goto out_wimlib_free; if (wim_info_get_num_images(pwm->wim_info) != pwm->hdr.image_count) { ERROR("Image count in XML data is not the same as in WIM header."); ret = WIMLIB_ERR_IMAGE_COUNT; goto out_wimlib_free; } } /* Get image index (this may use the XML data that was just read to * resolve an image name). */ if (image_num_or_name) { image = wimlib_resolve_image(pwm, image_num_or_name); if (image == WIMLIB_NO_IMAGE) { ERROR("\"%"TS"\" is not a valid image in the pipable WIM!", image_num_or_name); ret = WIMLIB_ERR_INVALID_IMAGE; goto out_wimlib_free; } else if (image == WIMLIB_ALL_IMAGES) { ERROR("Applying all images from a pipe is not supported!"); ret = WIMLIB_ERR_INVALID_IMAGE; goto out_wimlib_free; } } else { if (pwm->hdr.image_count != 1) { ERROR("No image was specified, but the pipable WIM " "did not contain exactly 1 image"); ret = WIMLIB_ERR_INVALID_IMAGE; goto out_wimlib_free; } image = 1; } /* Load the needed metadata resource. */ for (i = 1; i <= pwm->hdr.image_count; i++) { struct wim_image_metadata *imd; struct wim_reshdr reshdr; struct wim_resource_descriptor *metadata_rdesc; imd = pwm->image_metadata[i - 1]; ret = WIMLIB_ERR_NOMEM; imd->metadata_blob = new_blob_descriptor(); if (!imd->metadata_blob) goto out_wimlib_free; imd->metadata_blob->is_metadata = 1; ret = read_pwm_blob_header(pwm, imd->metadata_blob->hash, &reshdr, NULL); if (ret) goto out_wimlib_free; if (!(reshdr.flags & WIM_RESHDR_FLAG_METADATA)) { ERROR("Expected metadata resource, but found " "non-metadata resource"); ret = WIMLIB_ERR_INVALID_PIPABLE_WIM; goto out_wimlib_free; } ret = WIMLIB_ERR_NOMEM; metadata_rdesc = MALLOC(sizeof(struct wim_resource_descriptor)); if (!metadata_rdesc) goto out_wimlib_free; wim_reshdr_to_desc_and_blob(&reshdr, pwm, metadata_rdesc, imd->metadata_blob); if (i == image) { /* Metadata resource is for the image being extracted. * Parse it and save the metadata in memory. */ ret = read_metadata_resource(imd); if (ret) goto out_wimlib_free; imd->modified = 1; } else { /* Metadata resource is not for the image being * extracted. Skip over it. */ ret = skip_wim_resource(metadata_rdesc); if (ret) goto out_wimlib_free; } } /* Extract the image. */ extract_flags |= WIMLIB_EXTRACT_FLAG_FROM_PIPE; ret = do_wimlib_extract_image(pwm, image, target, extract_flags); /* Clean up and return. */ out_wimlib_free: wimlib_free(pwm); return ret; } WIMLIBAPI int wimlib_extract_image_from_pipe(int pipe_fd, const tchar *image_num_or_name, const tchar *target, int extract_flags) { return wimlib_extract_image_from_pipe_with_progress(pipe_fd, image_num_or_name, target, extract_flags, NULL, NULL); } WIMLIBAPI int wimlib_extract_image(WIMStruct *wim, int image, const tchar *target, int extract_flags) { if (extract_flags & ~WIMLIB_EXTRACT_MASK_PUBLIC) return WIMLIB_ERR_INVALID_PARAM; return do_wimlib_extract_image(wim, image, target, extract_flags); }