1264 lines
42 KiB
C++
1264 lines
42 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* Read-only access to Zip archives, with minimal heap allocation.
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*/
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <memory>
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#include <vector>
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#include "base/file.h"
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#include "base/macros.h" // TEMP_FAILURE_RETRY may or may not be in unistd
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#include "base/memory.h"
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#include "log/log.h"
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#include "utils/Compat.h"
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#include "utils/FileMap.h"
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#include "zlib.h"
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#include "entry_name_utils-inl.h"
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#include "ziparchive/zip_archive.h"
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using android::base::get_unaligned;
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// This is for windows. If we don't open a file in binary mode, weird
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// things will happen.
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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// The "end of central directory" (EOCD) record. Each archive
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// contains exactly once such record which appears at the end of
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// the archive. It contains archive wide information like the
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// number of entries in the archive and the offset to the central
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// directory of the offset.
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struct EocdRecord {
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static const uint32_t kSignature = 0x06054b50;
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// End of central directory signature, should always be
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// |kSignature|.
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uint32_t eocd_signature;
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// The number of the current "disk", i.e, the "disk" that this
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// central directory is on.
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//
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// This implementation assumes that each archive spans a single
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// disk only. i.e, that disk_num == 1.
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uint16_t disk_num;
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// The disk where the central directory starts.
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//
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// This implementation assumes that each archive spans a single
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// disk only. i.e, that cd_start_disk == 1.
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uint16_t cd_start_disk;
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// The number of central directory records on this disk.
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//
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// This implementation assumes that each archive spans a single
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// disk only. i.e, that num_records_on_disk == num_records.
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uint16_t num_records_on_disk;
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// The total number of central directory records.
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uint16_t num_records;
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// The size of the central directory (in bytes).
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uint32_t cd_size;
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// The offset of the start of the central directory, relative
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// to the start of the file.
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uint32_t cd_start_offset;
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// Length of the central directory comment.
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uint16_t comment_length;
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private:
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EocdRecord() = default;
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DISALLOW_COPY_AND_ASSIGN(EocdRecord);
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} __attribute__((packed));
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// A structure representing the fixed length fields for a single
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// record in the central directory of the archive. In addition to
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// the fixed length fields listed here, each central directory
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// record contains a variable length "file_name" and "extra_field"
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// whose lengths are given by |file_name_length| and |extra_field_length|
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// respectively.
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struct CentralDirectoryRecord {
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static const uint32_t kSignature = 0x02014b50;
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// The start of record signature. Must be |kSignature|.
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uint32_t record_signature;
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// Tool version. Ignored by this implementation.
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uint16_t version_made_by;
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// Tool version. Ignored by this implementation.
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uint16_t version_needed;
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// The "general purpose bit flags" for this entry. The only
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// flag value that we currently check for is the "data descriptor"
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// flag.
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uint16_t gpb_flags;
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// The compression method for this entry, one of |kCompressStored|
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// and |kCompressDeflated|.
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uint16_t compression_method;
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// The file modification time and date for this entry.
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uint16_t last_mod_time;
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uint16_t last_mod_date;
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// The CRC-32 checksum for this entry.
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uint32_t crc32;
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// The compressed size (in bytes) of this entry.
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uint32_t compressed_size;
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// The uncompressed size (in bytes) of this entry.
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uint32_t uncompressed_size;
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// The length of the entry file name in bytes. The file name
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// will appear immediately after this record.
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uint16_t file_name_length;
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// The length of the extra field info (in bytes). This data
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// will appear immediately after the entry file name.
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uint16_t extra_field_length;
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// The length of the entry comment (in bytes). This data will
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// appear immediately after the extra field.
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uint16_t comment_length;
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// The start disk for this entry. Ignored by this implementation).
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uint16_t file_start_disk;
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// File attributes. Ignored by this implementation.
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uint16_t internal_file_attributes;
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// File attributes. Ignored by this implementation.
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uint32_t external_file_attributes;
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// The offset to the local file header for this entry, from the
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// beginning of this archive.
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uint32_t local_file_header_offset;
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private:
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CentralDirectoryRecord() = default;
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DISALLOW_COPY_AND_ASSIGN(CentralDirectoryRecord);
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} __attribute__((packed));
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// The local file header for a given entry. This duplicates information
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// present in the central directory of the archive. It is an error for
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// the information here to be different from the central directory
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// information for a given entry.
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struct LocalFileHeader {
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static const uint32_t kSignature = 0x04034b50;
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// The local file header signature, must be |kSignature|.
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uint32_t lfh_signature;
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// Tool version. Ignored by this implementation.
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uint16_t version_needed;
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// The "general purpose bit flags" for this entry. The only
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// flag value that we currently check for is the "data descriptor"
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// flag.
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uint16_t gpb_flags;
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// The compression method for this entry, one of |kCompressStored|
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// and |kCompressDeflated|.
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uint16_t compression_method;
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// The file modification time and date for this entry.
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uint16_t last_mod_time;
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uint16_t last_mod_date;
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// The CRC-32 checksum for this entry.
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uint32_t crc32;
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// The compressed size (in bytes) of this entry.
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uint32_t compressed_size;
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// The uncompressed size (in bytes) of this entry.
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uint32_t uncompressed_size;
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// The length of the entry file name in bytes. The file name
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// will appear immediately after this record.
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uint16_t file_name_length;
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// The length of the extra field info (in bytes). This data
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// will appear immediately after the entry file name.
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uint16_t extra_field_length;
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private:
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LocalFileHeader() = default;
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DISALLOW_COPY_AND_ASSIGN(LocalFileHeader);
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} __attribute__((packed));
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struct DataDescriptor {
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// The *optional* data descriptor start signature.
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static const uint32_t kOptSignature = 0x08074b50;
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// CRC-32 checksum of the entry.
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uint32_t crc32;
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// Compressed size of the entry.
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uint32_t compressed_size;
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// Uncompressed size of the entry.
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uint32_t uncompressed_size;
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private:
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DataDescriptor() = default;
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DISALLOW_COPY_AND_ASSIGN(DataDescriptor);
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} __attribute__((packed));
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static const uint32_t kGPBDDFlagMask = 0x0008; // mask value that signifies that the entry has a DD
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// The maximum size of a central directory or a file
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// comment in bytes.
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static const uint32_t kMaxCommentLen = 65535;
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// The maximum number of bytes to scan backwards for the EOCD start.
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static const uint32_t kMaxEOCDSearch = kMaxCommentLen + sizeof(EocdRecord);
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static const char* kErrorMessages[] = {
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"Unknown return code.",
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"Iteration ended",
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"Zlib error",
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"Invalid file",
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"Invalid handle",
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"Duplicate entries in archive",
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"Empty archive",
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"Entry not found",
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"Invalid offset",
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"Inconsistent information",
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"Invalid entry name",
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"I/O Error",
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"File mapping failed"
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};
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static const int32_t kErrorMessageUpperBound = 0;
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static const int32_t kIterationEnd = -1;
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// We encountered a Zlib error when inflating a stream from this file.
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// Usually indicates file corruption.
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static const int32_t kZlibError = -2;
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// The input file cannot be processed as a zip archive. Usually because
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// it's too small, too large or does not have a valid signature.
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static const int32_t kInvalidFile = -3;
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// An invalid iteration / ziparchive handle was passed in as an input
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// argument.
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static const int32_t kInvalidHandle = -4;
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// The zip archive contained two (or possibly more) entries with the same
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// name.
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static const int32_t kDuplicateEntry = -5;
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// The zip archive contains no entries.
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static const int32_t kEmptyArchive = -6;
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// The specified entry was not found in the archive.
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static const int32_t kEntryNotFound = -7;
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// The zip archive contained an invalid local file header pointer.
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static const int32_t kInvalidOffset = -8;
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// The zip archive contained inconsistent entry information. This could
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// be because the central directory & local file header did not agree, or
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// if the actual uncompressed length or crc32 do not match their declared
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// values.
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static const int32_t kInconsistentInformation = -9;
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// An invalid entry name was encountered.
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static const int32_t kInvalidEntryName = -10;
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// An I/O related system call (read, lseek, ftruncate, map) failed.
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static const int32_t kIoError = -11;
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// We were not able to mmap the central directory or entry contents.
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static const int32_t kMmapFailed = -12;
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static const int32_t kErrorMessageLowerBound = -13;
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/*
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* A Read-only Zip archive.
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*
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* We want "open" and "find entry by name" to be fast operations, and
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* we want to use as little memory as possible. We memory-map the zip
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* central directory, and load a hash table with pointers to the filenames
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* (which aren't null-terminated). The other fields are at a fixed offset
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* from the filename, so we don't need to extract those (but we do need
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* to byte-read and endian-swap them every time we want them).
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*
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* It's possible that somebody has handed us a massive (~1GB) zip archive,
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* so we can't expect to mmap the entire file.
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*
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* To speed comparisons when doing a lookup by name, we could make the mapping
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* "private" (copy-on-write) and null-terminate the filenames after verifying
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* the record structure. However, this requires a private mapping of
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* every page that the Central Directory touches. Easier to tuck a copy
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* of the string length into the hash table entry.
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*/
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struct ZipArchive {
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/* open Zip archive */
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const int fd;
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const bool close_file;
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/* mapped central directory area */
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off64_t directory_offset;
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android::FileMap directory_map;
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/* number of entries in the Zip archive */
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uint16_t num_entries;
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/*
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* We know how many entries are in the Zip archive, so we can have a
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* fixed-size hash table. We define a load factor of 0.75 and overallocat
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* so the maximum number entries can never be higher than
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* ((4 * UINT16_MAX) / 3 + 1) which can safely fit into a uint32_t.
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*/
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uint32_t hash_table_size;
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ZipEntryName* hash_table;
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ZipArchive(const int fd, bool assume_ownership) :
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fd(fd),
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close_file(assume_ownership),
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directory_offset(0),
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num_entries(0),
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hash_table_size(0),
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hash_table(NULL) {}
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~ZipArchive() {
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if (close_file && fd >= 0) {
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close(fd);
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}
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free(hash_table);
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}
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};
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/*
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* Round up to the next highest power of 2.
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*
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* Found on http://graphics.stanford.edu/~seander/bithacks.html.
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*/
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static uint32_t RoundUpPower2(uint32_t val) {
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val--;
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val |= val >> 1;
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val |= val >> 2;
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val |= val >> 4;
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val |= val >> 8;
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val |= val >> 16;
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val++;
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return val;
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}
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static uint32_t ComputeHash(const ZipEntryName& name) {
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uint32_t hash = 0;
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uint16_t len = name.name_length;
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const uint8_t* str = name.name;
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while (len--) {
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hash = hash * 31 + *str++;
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}
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return hash;
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}
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/*
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* Convert a ZipEntry to a hash table index, verifying that it's in a
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* valid range.
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*/
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static int64_t EntryToIndex(const ZipEntryName* hash_table,
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const uint32_t hash_table_size,
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const ZipEntryName& name) {
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const uint32_t hash = ComputeHash(name);
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// NOTE: (hash_table_size - 1) is guaranteed to be non-negative.
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uint32_t ent = hash & (hash_table_size - 1);
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while (hash_table[ent].name != NULL) {
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if (hash_table[ent].name_length == name.name_length &&
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memcmp(hash_table[ent].name, name.name, name.name_length) == 0) {
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return ent;
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}
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ent = (ent + 1) & (hash_table_size - 1);
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}
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ALOGV("Zip: Unable to find entry %.*s", name.name_length, name.name);
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return kEntryNotFound;
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}
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/*
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* Add a new entry to the hash table.
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*/
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static int32_t AddToHash(ZipEntryName *hash_table, const uint64_t hash_table_size,
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const ZipEntryName& name) {
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const uint64_t hash = ComputeHash(name);
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uint32_t ent = hash & (hash_table_size - 1);
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/*
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* We over-allocated the table, so we're guaranteed to find an empty slot.
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* Further, we guarantee that the hashtable size is not 0.
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*/
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while (hash_table[ent].name != NULL) {
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if (hash_table[ent].name_length == name.name_length &&
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memcmp(hash_table[ent].name, name.name, name.name_length) == 0) {
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// We've found a duplicate entry. We don't accept it
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ALOGW("Zip: Found duplicate entry %.*s", name.name_length, name.name);
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return kDuplicateEntry;
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}
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ent = (ent + 1) & (hash_table_size - 1);
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}
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hash_table[ent].name = name.name;
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hash_table[ent].name_length = name.name_length;
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return 0;
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}
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static int32_t MapCentralDirectory0(int fd, const char* debug_file_name,
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ZipArchive* archive, off64_t file_length,
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off64_t read_amount, uint8_t* scan_buffer) {
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const off64_t search_start = file_length - read_amount;
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if (lseek64(fd, search_start, SEEK_SET) != search_start) {
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ALOGW("Zip: seek %" PRId64 " failed: %s", static_cast<int64_t>(search_start),
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strerror(errno));
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return kIoError;
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}
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ssize_t actual = TEMP_FAILURE_RETRY(
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read(fd, scan_buffer, static_cast<size_t>(read_amount)));
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if (actual != static_cast<ssize_t>(read_amount)) {
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ALOGW("Zip: read %" PRId64 " failed: %s", static_cast<int64_t>(read_amount),
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strerror(errno));
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return kIoError;
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}
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/*
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* Scan backward for the EOCD magic. In an archive without a trailing
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* comment, we'll find it on the first try. (We may want to consider
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* doing an initial minimal read; if we don't find it, retry with a
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* second read as above.)
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*/
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int i = read_amount - sizeof(EocdRecord);
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for (; i >= 0; i--) {
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if (scan_buffer[i] == 0x50) {
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uint32_t* sig_addr = reinterpret_cast<uint32_t*>(&scan_buffer[i]);
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if (get_unaligned<uint32_t>(sig_addr) == EocdRecord::kSignature) {
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ALOGV("+++ Found EOCD at buf+%d", i);
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break;
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}
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}
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}
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if (i < 0) {
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ALOGD("Zip: EOCD not found, %s is not zip", debug_file_name);
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return kInvalidFile;
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}
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const off64_t eocd_offset = search_start + i;
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const EocdRecord* eocd = reinterpret_cast<const EocdRecord*>(scan_buffer + i);
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/*
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* Verify that there's no trailing space at the end of the central directory
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* and its comment.
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*/
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const off64_t calculated_length = eocd_offset + sizeof(EocdRecord)
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+ eocd->comment_length;
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if (calculated_length != file_length) {
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ALOGW("Zip: %" PRId64 " extraneous bytes at the end of the central directory",
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static_cast<int64_t>(file_length - calculated_length));
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return kInvalidFile;
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}
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|
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/*
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* Grab the CD offset and size, and the number of entries in the
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* archive and verify that they look reasonable.
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*/
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if (eocd->cd_start_offset + eocd->cd_size > eocd_offset) {
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ALOGW("Zip: bad offsets (dir %" PRIu32 ", size %" PRIu32 ", eocd %" PRId64 ")",
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eocd->cd_start_offset, eocd->cd_size, static_cast<int64_t>(eocd_offset));
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return kInvalidOffset;
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}
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if (eocd->num_records == 0) {
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ALOGW("Zip: empty archive?");
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return kEmptyArchive;
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}
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ALOGV("+++ num_entries=%" PRIu32 "dir_size=%" PRIu32 " dir_offset=%" PRIu32,
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eocd->num_records, eocd->cd_size, eocd->cd_start_offset);
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/*
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* It all looks good. Create a mapping for the CD, and set the fields
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* in archive.
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*/
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if (!archive->directory_map.create(debug_file_name, fd,
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static_cast<off64_t>(eocd->cd_start_offset),
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static_cast<size_t>(eocd->cd_size), true /* read only */) ) {
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return kMmapFailed;
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}
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|
|
archive->num_entries = eocd->num_records;
|
|
archive->directory_offset = eocd->cd_start_offset;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Find the zip Central Directory and memory-map it.
|
|
*
|
|
* On success, returns 0 after populating fields from the EOCD area:
|
|
* directory_offset
|
|
* directory_map
|
|
* num_entries
|
|
*/
|
|
static int32_t MapCentralDirectory(int fd, const char* debug_file_name,
|
|
ZipArchive* archive) {
|
|
|
|
// Test file length. We use lseek64 to make sure the file
|
|
// is small enough to be a zip file (Its size must be less than
|
|
// 0xffffffff bytes).
|
|
off64_t file_length = lseek64(fd, 0, SEEK_END);
|
|
if (file_length == -1) {
|
|
ALOGV("Zip: lseek on fd %d failed", fd);
|
|
return kInvalidFile;
|
|
}
|
|
|
|
if (file_length > static_cast<off64_t>(0xffffffff)) {
|
|
ALOGV("Zip: zip file too long %" PRId64, static_cast<int64_t>(file_length));
|
|
return kInvalidFile;
|
|
}
|
|
|
|
if (file_length < static_cast<off64_t>(sizeof(EocdRecord))) {
|
|
ALOGV("Zip: length %" PRId64 " is too small to be zip", static_cast<int64_t>(file_length));
|
|
return kInvalidFile;
|
|
}
|
|
|
|
/*
|
|
* Perform the traditional EOCD snipe hunt.
|
|
*
|
|
* We're searching for the End of Central Directory magic number,
|
|
* which appears at the start of the EOCD block. It's followed by
|
|
* 18 bytes of EOCD stuff and up to 64KB of archive comment. We
|
|
* need to read the last part of the file into a buffer, dig through
|
|
* it to find the magic number, parse some values out, and use those
|
|
* to determine the extent of the CD.
|
|
*
|
|
* We start by pulling in the last part of the file.
|
|
*/
|
|
off64_t read_amount = kMaxEOCDSearch;
|
|
if (file_length < read_amount) {
|
|
read_amount = file_length;
|
|
}
|
|
|
|
uint8_t* scan_buffer = reinterpret_cast<uint8_t*>(malloc(read_amount));
|
|
int32_t result = MapCentralDirectory0(fd, debug_file_name, archive,
|
|
file_length, read_amount, scan_buffer);
|
|
|
|
free(scan_buffer);
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Parses the Zip archive's Central Directory. Allocates and populates the
|
|
* hash table.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
static int32_t ParseZipArchive(ZipArchive* archive) {
|
|
const uint8_t* const cd_ptr =
|
|
reinterpret_cast<const uint8_t*>(archive->directory_map.getDataPtr());
|
|
const size_t cd_length = archive->directory_map.getDataLength();
|
|
const uint16_t num_entries = archive->num_entries;
|
|
|
|
/*
|
|
* Create hash table. We have a minimum 75% load factor, possibly as
|
|
* low as 50% after we round off to a power of 2. There must be at
|
|
* least one unused entry to avoid an infinite loop during creation.
|
|
*/
|
|
archive->hash_table_size = RoundUpPower2(1 + (num_entries * 4) / 3);
|
|
archive->hash_table = reinterpret_cast<ZipEntryName*>(calloc(archive->hash_table_size,
|
|
sizeof(ZipEntryName)));
|
|
|
|
/*
|
|
* Walk through the central directory, adding entries to the hash
|
|
* table and verifying values.
|
|
*/
|
|
const uint8_t* const cd_end = cd_ptr + cd_length;
|
|
const uint8_t* ptr = cd_ptr;
|
|
for (uint16_t i = 0; i < num_entries; i++) {
|
|
const CentralDirectoryRecord* cdr =
|
|
reinterpret_cast<const CentralDirectoryRecord*>(ptr);
|
|
if (cdr->record_signature != CentralDirectoryRecord::kSignature) {
|
|
ALOGW("Zip: missed a central dir sig (at %" PRIu16 ")", i);
|
|
return -1;
|
|
}
|
|
|
|
if (ptr + sizeof(CentralDirectoryRecord) > cd_end) {
|
|
ALOGW("Zip: ran off the end (at %" PRIu16 ")", i);
|
|
return -1;
|
|
}
|
|
|
|
const off64_t local_header_offset = cdr->local_file_header_offset;
|
|
if (local_header_offset >= archive->directory_offset) {
|
|
ALOGW("Zip: bad LFH offset %" PRId64 " at entry %" PRIu16,
|
|
static_cast<int64_t>(local_header_offset), i);
|
|
return -1;
|
|
}
|
|
|
|
const uint16_t file_name_length = cdr->file_name_length;
|
|
const uint16_t extra_length = cdr->extra_field_length;
|
|
const uint16_t comment_length = cdr->comment_length;
|
|
const uint8_t* file_name = ptr + sizeof(CentralDirectoryRecord);
|
|
|
|
/* check that file name is valid UTF-8 and doesn't contain NUL (U+0000) characters */
|
|
if (!IsValidEntryName(file_name, file_name_length)) {
|
|
return -1;
|
|
}
|
|
|
|
/* add the CDE filename to the hash table */
|
|
ZipEntryName entry_name;
|
|
entry_name.name = file_name;
|
|
entry_name.name_length = file_name_length;
|
|
const int add_result = AddToHash(archive->hash_table,
|
|
archive->hash_table_size, entry_name);
|
|
if (add_result != 0) {
|
|
ALOGW("Zip: Error adding entry to hash table %d", add_result);
|
|
return add_result;
|
|
}
|
|
|
|
ptr += sizeof(CentralDirectoryRecord) + file_name_length + extra_length + comment_length;
|
|
if ((ptr - cd_ptr) > static_cast<int64_t>(cd_length)) {
|
|
ALOGW("Zip: bad CD advance (%tu vs %zu) at entry %" PRIu16,
|
|
ptr - cd_ptr, cd_length, i);
|
|
return -1;
|
|
}
|
|
}
|
|
ALOGV("+++ zip good scan %" PRIu16 " entries", num_entries);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int32_t OpenArchiveInternal(ZipArchive* archive,
|
|
const char* debug_file_name) {
|
|
int32_t result = -1;
|
|
if ((result = MapCentralDirectory(archive->fd, debug_file_name, archive))) {
|
|
return result;
|
|
}
|
|
|
|
if ((result = ParseZipArchive(archive))) {
|
|
return result;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int32_t OpenArchiveFd(int fd, const char* debug_file_name,
|
|
ZipArchiveHandle* handle, bool assume_ownership) {
|
|
ZipArchive* archive = new ZipArchive(fd, assume_ownership);
|
|
*handle = archive;
|
|
return OpenArchiveInternal(archive, debug_file_name);
|
|
}
|
|
|
|
int32_t OpenArchive(const char* fileName, ZipArchiveHandle* handle) {
|
|
const int fd = open(fileName, O_RDONLY | O_BINARY, 0);
|
|
ZipArchive* archive = new ZipArchive(fd, true);
|
|
*handle = archive;
|
|
|
|
if (fd < 0) {
|
|
ALOGW("Unable to open '%s': %s", fileName, strerror(errno));
|
|
return kIoError;
|
|
}
|
|
|
|
return OpenArchiveInternal(archive, fileName);
|
|
}
|
|
|
|
/*
|
|
* Close a ZipArchive, closing the file and freeing the contents.
|
|
*/
|
|
void CloseArchive(ZipArchiveHandle handle) {
|
|
ZipArchive* archive = reinterpret_cast<ZipArchive*>(handle);
|
|
ALOGV("Closing archive %p", archive);
|
|
delete archive;
|
|
}
|
|
|
|
static int32_t UpdateEntryFromDataDescriptor(int fd,
|
|
ZipEntry *entry) {
|
|
uint8_t ddBuf[sizeof(DataDescriptor) + sizeof(DataDescriptor::kOptSignature)];
|
|
ssize_t actual = TEMP_FAILURE_RETRY(read(fd, ddBuf, sizeof(ddBuf)));
|
|
if (actual != sizeof(ddBuf)) {
|
|
return kIoError;
|
|
}
|
|
|
|
const uint32_t ddSignature = *(reinterpret_cast<const uint32_t*>(ddBuf));
|
|
const uint16_t offset = (ddSignature == DataDescriptor::kOptSignature) ? 4 : 0;
|
|
const DataDescriptor* descriptor = reinterpret_cast<const DataDescriptor*>(ddBuf + offset);
|
|
|
|
entry->crc32 = descriptor->crc32;
|
|
entry->compressed_length = descriptor->compressed_size;
|
|
entry->uncompressed_length = descriptor->uncompressed_size;
|
|
|
|
return 0;
|
|
}
|
|
|
|
// Attempts to read |len| bytes into |buf| at offset |off|.
|
|
//
|
|
// This method uses pread64 on platforms that support it and
|
|
// lseek64 + read on platforms that don't. This implies that
|
|
// callers should not rely on the |fd| offset being incremented
|
|
// as a side effect of this call.
|
|
static inline ssize_t ReadAtOffset(int fd, uint8_t* buf, size_t len,
|
|
off64_t off) {
|
|
#if !defined(_WIN32)
|
|
return TEMP_FAILURE_RETRY(pread64(fd, buf, len, off));
|
|
#else
|
|
// The only supported platform that doesn't support pread at the moment
|
|
// is Windows. Only recent versions of windows support unix like forks,
|
|
// and even there the semantics are quite different.
|
|
if (lseek64(fd, off, SEEK_SET) != off) {
|
|
ALOGW("Zip: failed seek to offset %" PRId64, off);
|
|
return kIoError;
|
|
}
|
|
|
|
return TEMP_FAILURE_RETRY(read(fd, buf, len));
|
|
#endif
|
|
}
|
|
|
|
static int32_t FindEntry(const ZipArchive* archive, const int ent,
|
|
ZipEntry* data) {
|
|
const uint16_t nameLen = archive->hash_table[ent].name_length;
|
|
|
|
// Recover the start of the central directory entry from the filename
|
|
// pointer. The filename is the first entry past the fixed-size data,
|
|
// so we can just subtract back from that.
|
|
const uint8_t* ptr = archive->hash_table[ent].name;
|
|
ptr -= sizeof(CentralDirectoryRecord);
|
|
|
|
// This is the base of our mmapped region, we have to sanity check that
|
|
// the name that's in the hash table is a pointer to a location within
|
|
// this mapped region.
|
|
const uint8_t* base_ptr = reinterpret_cast<const uint8_t*>(
|
|
archive->directory_map.getDataPtr());
|
|
if (ptr < base_ptr || ptr > base_ptr + archive->directory_map.getDataLength()) {
|
|
ALOGW("Zip: Invalid entry pointer");
|
|
return kInvalidOffset;
|
|
}
|
|
|
|
const CentralDirectoryRecord *cdr =
|
|
reinterpret_cast<const CentralDirectoryRecord*>(ptr);
|
|
|
|
// The offset of the start of the central directory in the zipfile.
|
|
// We keep this lying around so that we can sanity check all our lengths
|
|
// and our per-file structures.
|
|
const off64_t cd_offset = archive->directory_offset;
|
|
|
|
// Fill out the compression method, modification time, crc32
|
|
// and other interesting attributes from the central directory. These
|
|
// will later be compared against values from the local file header.
|
|
data->method = cdr->compression_method;
|
|
data->mod_time = cdr->last_mod_time;
|
|
data->crc32 = cdr->crc32;
|
|
data->compressed_length = cdr->compressed_size;
|
|
data->uncompressed_length = cdr->uncompressed_size;
|
|
|
|
// Figure out the local header offset from the central directory. The
|
|
// actual file data will begin after the local header and the name /
|
|
// extra comments.
|
|
const off64_t local_header_offset = cdr->local_file_header_offset;
|
|
if (local_header_offset + static_cast<off64_t>(sizeof(LocalFileHeader)) >= cd_offset) {
|
|
ALOGW("Zip: bad local hdr offset in zip");
|
|
return kInvalidOffset;
|
|
}
|
|
|
|
uint8_t lfh_buf[sizeof(LocalFileHeader)];
|
|
ssize_t actual = ReadAtOffset(archive->fd, lfh_buf, sizeof(lfh_buf),
|
|
local_header_offset);
|
|
if (actual != sizeof(lfh_buf)) {
|
|
ALOGW("Zip: failed reading lfh name from offset %" PRId64,
|
|
static_cast<int64_t>(local_header_offset));
|
|
return kIoError;
|
|
}
|
|
|
|
const LocalFileHeader *lfh = reinterpret_cast<const LocalFileHeader*>(lfh_buf);
|
|
|
|
if (lfh->lfh_signature != LocalFileHeader::kSignature) {
|
|
ALOGW("Zip: didn't find signature at start of lfh, offset=%" PRId64,
|
|
static_cast<int64_t>(local_header_offset));
|
|
return kInvalidOffset;
|
|
}
|
|
|
|
// Paranoia: Match the values specified in the local file header
|
|
// to those specified in the central directory.
|
|
if ((lfh->gpb_flags & kGPBDDFlagMask) == 0) {
|
|
data->has_data_descriptor = 0;
|
|
if (data->compressed_length != lfh->compressed_size
|
|
|| data->uncompressed_length != lfh->uncompressed_size
|
|
|| data->crc32 != lfh->crc32) {
|
|
ALOGW("Zip: size/crc32 mismatch. expected {%" PRIu32 ", %" PRIu32
|
|
", %" PRIx32 "}, was {%" PRIu32 ", %" PRIu32 ", %" PRIx32 "}",
|
|
data->compressed_length, data->uncompressed_length, data->crc32,
|
|
lfh->compressed_size, lfh->uncompressed_size, lfh->crc32);
|
|
return kInconsistentInformation;
|
|
}
|
|
} else {
|
|
data->has_data_descriptor = 1;
|
|
}
|
|
|
|
// Check that the local file header name matches the declared
|
|
// name in the central directory.
|
|
if (lfh->file_name_length == nameLen) {
|
|
const off64_t name_offset = local_header_offset + sizeof(LocalFileHeader);
|
|
if (name_offset + lfh->file_name_length > cd_offset) {
|
|
ALOGW("Zip: Invalid declared length");
|
|
return kInvalidOffset;
|
|
}
|
|
|
|
uint8_t* name_buf = reinterpret_cast<uint8_t*>(malloc(nameLen));
|
|
ssize_t actual = ReadAtOffset(archive->fd, name_buf, nameLen,
|
|
name_offset);
|
|
|
|
if (actual != nameLen) {
|
|
ALOGW("Zip: failed reading lfh name from offset %" PRId64, static_cast<int64_t>(name_offset));
|
|
free(name_buf);
|
|
return kIoError;
|
|
}
|
|
|
|
if (memcmp(archive->hash_table[ent].name, name_buf, nameLen)) {
|
|
free(name_buf);
|
|
return kInconsistentInformation;
|
|
}
|
|
|
|
free(name_buf);
|
|
} else {
|
|
ALOGW("Zip: lfh name did not match central directory.");
|
|
return kInconsistentInformation;
|
|
}
|
|
|
|
const off64_t data_offset = local_header_offset + sizeof(LocalFileHeader)
|
|
+ lfh->file_name_length + lfh->extra_field_length;
|
|
if (data_offset > cd_offset) {
|
|
ALOGW("Zip: bad data offset %" PRId64 " in zip", static_cast<int64_t>(data_offset));
|
|
return kInvalidOffset;
|
|
}
|
|
|
|
if (static_cast<off64_t>(data_offset + data->compressed_length) > cd_offset) {
|
|
ALOGW("Zip: bad compressed length in zip (%" PRId64 " + %" PRIu32 " > %" PRId64 ")",
|
|
static_cast<int64_t>(data_offset), data->compressed_length, static_cast<int64_t>(cd_offset));
|
|
return kInvalidOffset;
|
|
}
|
|
|
|
if (data->method == kCompressStored &&
|
|
static_cast<off64_t>(data_offset + data->uncompressed_length) > cd_offset) {
|
|
ALOGW("Zip: bad uncompressed length in zip (%" PRId64 " + %" PRIu32 " > %" PRId64 ")",
|
|
static_cast<int64_t>(data_offset), data->uncompressed_length,
|
|
static_cast<int64_t>(cd_offset));
|
|
return kInvalidOffset;
|
|
}
|
|
|
|
data->offset = data_offset;
|
|
return 0;
|
|
}
|
|
|
|
struct IterationHandle {
|
|
uint32_t position;
|
|
// We're not using vector here because this code is used in the Windows SDK
|
|
// where the STL is not available.
|
|
const uint8_t* prefix;
|
|
uint16_t prefix_len;
|
|
ZipArchive* archive;
|
|
|
|
IterationHandle() : prefix(NULL), prefix_len(0) {}
|
|
|
|
IterationHandle(const ZipEntryName& prefix_name)
|
|
: prefix_len(prefix_name.name_length) {
|
|
uint8_t* prefix_copy = new uint8_t[prefix_len];
|
|
memcpy(prefix_copy, prefix_name.name, prefix_len);
|
|
prefix = prefix_copy;
|
|
}
|
|
|
|
~IterationHandle() {
|
|
delete[] prefix;
|
|
}
|
|
};
|
|
|
|
int32_t StartIteration(ZipArchiveHandle handle, void** cookie_ptr,
|
|
const ZipEntryName* optional_prefix) {
|
|
ZipArchive* archive = reinterpret_cast<ZipArchive*>(handle);
|
|
|
|
if (archive == NULL || archive->hash_table == NULL) {
|
|
ALOGW("Zip: Invalid ZipArchiveHandle");
|
|
return kInvalidHandle;
|
|
}
|
|
|
|
IterationHandle* cookie =
|
|
optional_prefix != NULL ? new IterationHandle(*optional_prefix) : new IterationHandle();
|
|
cookie->position = 0;
|
|
cookie->archive = archive;
|
|
|
|
*cookie_ptr = cookie ;
|
|
return 0;
|
|
}
|
|
|
|
void EndIteration(void* cookie) {
|
|
delete reinterpret_cast<IterationHandle*>(cookie);
|
|
}
|
|
|
|
int32_t FindEntry(const ZipArchiveHandle handle, const ZipEntryName& entryName,
|
|
ZipEntry* data) {
|
|
const ZipArchive* archive = reinterpret_cast<ZipArchive*>(handle);
|
|
if (entryName.name_length == 0) {
|
|
ALOGW("Zip: Invalid filename %.*s", entryName.name_length, entryName.name);
|
|
return kInvalidEntryName;
|
|
}
|
|
|
|
const int64_t ent = EntryToIndex(archive->hash_table,
|
|
archive->hash_table_size, entryName);
|
|
|
|
if (ent < 0) {
|
|
ALOGV("Zip: Could not find entry %.*s", entryName.name_length, entryName.name);
|
|
return ent;
|
|
}
|
|
|
|
return FindEntry(archive, ent, data);
|
|
}
|
|
|
|
int32_t Next(void* cookie, ZipEntry* data, ZipEntryName* name) {
|
|
IterationHandle* handle = reinterpret_cast<IterationHandle*>(cookie);
|
|
if (handle == NULL) {
|
|
return kInvalidHandle;
|
|
}
|
|
|
|
ZipArchive* archive = handle->archive;
|
|
if (archive == NULL || archive->hash_table == NULL) {
|
|
ALOGW("Zip: Invalid ZipArchiveHandle");
|
|
return kInvalidHandle;
|
|
}
|
|
|
|
const uint32_t currentOffset = handle->position;
|
|
const uint32_t hash_table_length = archive->hash_table_size;
|
|
const ZipEntryName *hash_table = archive->hash_table;
|
|
|
|
for (uint32_t i = currentOffset; i < hash_table_length; ++i) {
|
|
if (hash_table[i].name != NULL &&
|
|
(handle->prefix_len == 0 ||
|
|
(memcmp(handle->prefix, hash_table[i].name, handle->prefix_len) == 0))) {
|
|
handle->position = (i + 1);
|
|
const int error = FindEntry(archive, i, data);
|
|
if (!error) {
|
|
name->name = hash_table[i].name;
|
|
name->name_length = hash_table[i].name_length;
|
|
}
|
|
|
|
return error;
|
|
}
|
|
}
|
|
|
|
handle->position = 0;
|
|
return kIterationEnd;
|
|
}
|
|
|
|
class Writer {
|
|
public:
|
|
virtual bool Append(uint8_t* buf, size_t buf_size) = 0;
|
|
virtual ~Writer() {}
|
|
protected:
|
|
Writer() = default;
|
|
private:
|
|
DISALLOW_COPY_AND_ASSIGN(Writer);
|
|
};
|
|
|
|
// A Writer that writes data to a fixed size memory region.
|
|
// The size of the memory region must be equal to the total size of
|
|
// the data appended to it.
|
|
class MemoryWriter : public Writer {
|
|
public:
|
|
MemoryWriter(uint8_t* buf, size_t size) : Writer(),
|
|
buf_(buf), size_(size), bytes_written_(0) {
|
|
}
|
|
|
|
virtual bool Append(uint8_t* buf, size_t buf_size) override {
|
|
if (bytes_written_ + buf_size > size_) {
|
|
ALOGW("Zip: Unexpected size " ZD " (declared) vs " ZD " (actual)",
|
|
size_, bytes_written_ + buf_size);
|
|
return false;
|
|
}
|
|
|
|
memcpy(buf_ + bytes_written_, buf, buf_size);
|
|
bytes_written_ += buf_size;
|
|
return true;
|
|
}
|
|
|
|
private:
|
|
uint8_t* const buf_;
|
|
const size_t size_;
|
|
size_t bytes_written_;
|
|
};
|
|
|
|
// A Writer that appends data to a file |fd| at its current position.
|
|
// The file will be truncated to the end of the written data.
|
|
class FileWriter : public Writer {
|
|
public:
|
|
|
|
// Creates a FileWriter for |fd| and prepare to write |entry| to it,
|
|
// guaranteeing that the file descriptor is valid and that there's enough
|
|
// space on the volume to write out the entry completely and that the file
|
|
// is truncated to the correct length.
|
|
//
|
|
// Returns a valid FileWriter on success, |nullptr| if an error occurred.
|
|
static std::unique_ptr<FileWriter> Create(int fd, const ZipEntry* entry) {
|
|
const uint32_t declared_length = entry->uncompressed_length;
|
|
const off64_t current_offset = lseek64(fd, 0, SEEK_CUR);
|
|
if (current_offset == -1) {
|
|
ALOGW("Zip: unable to seek to current location on fd %d: %s", fd, strerror(errno));
|
|
return nullptr;
|
|
}
|
|
|
|
int result = 0;
|
|
#if defined(__linux__)
|
|
if (declared_length > 0) {
|
|
// Make sure we have enough space on the volume to extract the compressed
|
|
// entry. Note that the call to ftruncate below will change the file size but
|
|
// will not allocate space on disk and this call to fallocate will not
|
|
// change the file size.
|
|
result = TEMP_FAILURE_RETRY(fallocate(fd, 0, current_offset, declared_length));
|
|
if (result == -1) {
|
|
ALOGW("Zip: unable to allocate space for file to %" PRId64 ": %s",
|
|
static_cast<int64_t>(declared_length + current_offset), strerror(errno));
|
|
return std::unique_ptr<FileWriter>(nullptr);
|
|
}
|
|
}
|
|
#endif // __linux__
|
|
|
|
result = TEMP_FAILURE_RETRY(ftruncate(fd, declared_length + current_offset));
|
|
if (result == -1) {
|
|
ALOGW("Zip: unable to truncate file to %" PRId64 ": %s",
|
|
static_cast<int64_t>(declared_length + current_offset), strerror(errno));
|
|
return std::unique_ptr<FileWriter>(nullptr);
|
|
}
|
|
|
|
return std::unique_ptr<FileWriter>(new FileWriter(fd, declared_length));
|
|
}
|
|
|
|
virtual bool Append(uint8_t* buf, size_t buf_size) override {
|
|
if (total_bytes_written_ + buf_size > declared_length_) {
|
|
ALOGW("Zip: Unexpected size " ZD " (declared) vs " ZD " (actual)",
|
|
declared_length_, total_bytes_written_ + buf_size);
|
|
return false;
|
|
}
|
|
|
|
const bool result = android::base::WriteFully(fd_, buf, buf_size);
|
|
if (result) {
|
|
total_bytes_written_ += buf_size;
|
|
} else {
|
|
ALOGW("Zip: unable to write " ZD " bytes to file; %s", buf_size, strerror(errno));
|
|
}
|
|
|
|
return result;
|
|
}
|
|
private:
|
|
FileWriter(const int fd, const size_t declared_length) :
|
|
Writer(),
|
|
fd_(fd),
|
|
declared_length_(declared_length),
|
|
total_bytes_written_(0) {
|
|
}
|
|
|
|
const int fd_;
|
|
const size_t declared_length_;
|
|
size_t total_bytes_written_;
|
|
};
|
|
|
|
// This method is using libz macros with old-style-casts
|
|
#pragma GCC diagnostic push
|
|
#pragma GCC diagnostic ignored "-Wold-style-cast"
|
|
static inline int zlib_inflateInit2(z_stream* stream, int window_bits) {
|
|
return inflateInit2(stream, window_bits);
|
|
}
|
|
#pragma GCC diagnostic pop
|
|
|
|
static int32_t InflateEntryToWriter(int fd, const ZipEntry* entry,
|
|
Writer* writer, uint64_t* crc_out) {
|
|
const size_t kBufSize = 32768;
|
|
std::vector<uint8_t> read_buf(kBufSize);
|
|
std::vector<uint8_t> write_buf(kBufSize);
|
|
z_stream zstream;
|
|
int zerr;
|
|
|
|
/*
|
|
* Initialize the zlib stream struct.
|
|
*/
|
|
memset(&zstream, 0, sizeof(zstream));
|
|
zstream.zalloc = Z_NULL;
|
|
zstream.zfree = Z_NULL;
|
|
zstream.opaque = Z_NULL;
|
|
zstream.next_in = NULL;
|
|
zstream.avail_in = 0;
|
|
zstream.next_out = &write_buf[0];
|
|
zstream.avail_out = kBufSize;
|
|
zstream.data_type = Z_UNKNOWN;
|
|
|
|
/*
|
|
* Use the undocumented "negative window bits" feature to tell zlib
|
|
* that there's no zlib header waiting for it.
|
|
*/
|
|
zerr = zlib_inflateInit2(&zstream, -MAX_WBITS);
|
|
if (zerr != Z_OK) {
|
|
if (zerr == Z_VERSION_ERROR) {
|
|
ALOGE("Installed zlib is not compatible with linked version (%s)",
|
|
ZLIB_VERSION);
|
|
} else {
|
|
ALOGW("Call to inflateInit2 failed (zerr=%d)", zerr);
|
|
}
|
|
|
|
return kZlibError;
|
|
}
|
|
|
|
auto zstream_deleter = [](z_stream* stream) {
|
|
inflateEnd(stream); /* free up any allocated structures */
|
|
};
|
|
|
|
std::unique_ptr<z_stream, decltype(zstream_deleter)> zstream_guard(&zstream, zstream_deleter);
|
|
|
|
const uint32_t uncompressed_length = entry->uncompressed_length;
|
|
|
|
uint32_t compressed_length = entry->compressed_length;
|
|
do {
|
|
/* read as much as we can */
|
|
if (zstream.avail_in == 0) {
|
|
const ZD_TYPE getSize = (compressed_length > kBufSize) ? kBufSize : compressed_length;
|
|
const ZD_TYPE actual = TEMP_FAILURE_RETRY(read(fd, &read_buf[0], getSize));
|
|
if (actual != getSize) {
|
|
ALOGW("Zip: inflate read failed (" ZD " vs " ZD ")", actual, getSize);
|
|
return kIoError;
|
|
}
|
|
|
|
compressed_length -= getSize;
|
|
|
|
zstream.next_in = &read_buf[0];
|
|
zstream.avail_in = getSize;
|
|
}
|
|
|
|
/* uncompress the data */
|
|
zerr = inflate(&zstream, Z_NO_FLUSH);
|
|
if (zerr != Z_OK && zerr != Z_STREAM_END) {
|
|
ALOGW("Zip: inflate zerr=%d (nIn=%p aIn=%u nOut=%p aOut=%u)",
|
|
zerr, zstream.next_in, zstream.avail_in,
|
|
zstream.next_out, zstream.avail_out);
|
|
return kZlibError;
|
|
}
|
|
|
|
/* write when we're full or when we're done */
|
|
if (zstream.avail_out == 0 ||
|
|
(zerr == Z_STREAM_END && zstream.avail_out != kBufSize)) {
|
|
const size_t write_size = zstream.next_out - &write_buf[0];
|
|
if (!writer->Append(&write_buf[0], write_size)) {
|
|
// The file might have declared a bogus length.
|
|
return kInconsistentInformation;
|
|
}
|
|
|
|
zstream.next_out = &write_buf[0];
|
|
zstream.avail_out = kBufSize;
|
|
}
|
|
} while (zerr == Z_OK);
|
|
|
|
assert(zerr == Z_STREAM_END); /* other errors should've been caught */
|
|
|
|
// stream.adler holds the crc32 value for such streams.
|
|
*crc_out = zstream.adler;
|
|
|
|
if (zstream.total_out != uncompressed_length || compressed_length != 0) {
|
|
ALOGW("Zip: size mismatch on inflated file (%lu vs %" PRIu32 ")",
|
|
zstream.total_out, uncompressed_length);
|
|
return kInconsistentInformation;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int32_t CopyEntryToWriter(int fd, const ZipEntry* entry, Writer* writer,
|
|
uint64_t *crc_out) {
|
|
static const uint32_t kBufSize = 32768;
|
|
std::vector<uint8_t> buf(kBufSize);
|
|
|
|
const uint32_t length = entry->uncompressed_length;
|
|
uint32_t count = 0;
|
|
uint64_t crc = 0;
|
|
while (count < length) {
|
|
uint32_t remaining = length - count;
|
|
|
|
// Safe conversion because kBufSize is narrow enough for a 32 bit signed
|
|
// value.
|
|
const ssize_t block_size = (remaining > kBufSize) ? kBufSize : remaining;
|
|
const ssize_t actual = TEMP_FAILURE_RETRY(read(fd, &buf[0], block_size));
|
|
|
|
if (actual != block_size) {
|
|
ALOGW("CopyFileToFile: copy read failed (" ZD " vs " ZD ")", actual, block_size);
|
|
return kIoError;
|
|
}
|
|
|
|
if (!writer->Append(&buf[0], block_size)) {
|
|
return kIoError;
|
|
}
|
|
crc = crc32(crc, &buf[0], block_size);
|
|
count += block_size;
|
|
}
|
|
|
|
*crc_out = crc;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int32_t ExtractToWriter(ZipArchiveHandle handle,
|
|
ZipEntry* entry, Writer* writer) {
|
|
ZipArchive* archive = reinterpret_cast<ZipArchive*>(handle);
|
|
const uint16_t method = entry->method;
|
|
off64_t data_offset = entry->offset;
|
|
|
|
if (lseek64(archive->fd, data_offset, SEEK_SET) != data_offset) {
|
|
ALOGW("Zip: lseek to data at %" PRId64 " failed", static_cast<int64_t>(data_offset));
|
|
return kIoError;
|
|
}
|
|
|
|
// this should default to kUnknownCompressionMethod.
|
|
int32_t return_value = -1;
|
|
uint64_t crc = 0;
|
|
if (method == kCompressStored) {
|
|
return_value = CopyEntryToWriter(archive->fd, entry, writer, &crc);
|
|
} else if (method == kCompressDeflated) {
|
|
return_value = InflateEntryToWriter(archive->fd, entry, writer, &crc);
|
|
}
|
|
|
|
if (!return_value && entry->has_data_descriptor) {
|
|
return_value = UpdateEntryFromDataDescriptor(archive->fd, entry);
|
|
if (return_value) {
|
|
return return_value;
|
|
}
|
|
}
|
|
|
|
// TODO: Fix this check by passing the right flags to inflate2 so that
|
|
// it calculates the CRC for us.
|
|
if (entry->crc32 != crc && false) {
|
|
ALOGW("Zip: crc mismatch: expected %" PRIu32 ", was %" PRIu64, entry->crc32, crc);
|
|
return kInconsistentInformation;
|
|
}
|
|
|
|
return return_value;
|
|
}
|
|
|
|
int32_t ExtractToMemory(ZipArchiveHandle handle, ZipEntry* entry,
|
|
uint8_t* begin, uint32_t size) {
|
|
std::unique_ptr<Writer> writer(new MemoryWriter(begin, size));
|
|
return ExtractToWriter(handle, entry, writer.get());
|
|
}
|
|
|
|
int32_t ExtractEntryToFile(ZipArchiveHandle handle,
|
|
ZipEntry* entry, int fd) {
|
|
std::unique_ptr<Writer> writer(FileWriter::Create(fd, entry));
|
|
if (writer.get() == nullptr) {
|
|
return kIoError;
|
|
}
|
|
|
|
return ExtractToWriter(handle, entry, writer.get());
|
|
}
|
|
|
|
const char* ErrorCodeString(int32_t error_code) {
|
|
if (error_code > kErrorMessageLowerBound && error_code < kErrorMessageUpperBound) {
|
|
return kErrorMessages[error_code * -1];
|
|
}
|
|
|
|
return kErrorMessages[0];
|
|
}
|
|
|
|
int GetFileDescriptor(const ZipArchiveHandle handle) {
|
|
return reinterpret_cast<ZipArchive*>(handle)->fd;
|
|
}
|
|
|