2adb7e3768
Summary: x.size() -1 or y - 1 can overflow to an extremely large value when x.size() pr y is 0 when they are unsigned type. The end condition of i in the for loop will be extremely large, potentially causes segment fault. Fix them. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6902 Test Plan: pass make asan_check Reviewed By: ajkr Differential Revision: D21843767 Pulled By: zhichao-cao fbshipit-source-id: 5b8b88155ac5a93d86246d832e89905a783bb5a1
280 lines
9.1 KiB
C++
280 lines
9.1 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#ifndef ROCKSDB_LITE
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#include "utilities/blob_db/blob_dump_tool.h"
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#include <stdio.h>
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#include <cinttypes>
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#include <iostream>
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#include <memory>
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#include <string>
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#include "env/composite_env_wrapper.h"
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#include "file/random_access_file_reader.h"
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#include "file/readahead_raf.h"
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#include "port/port.h"
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#include "rocksdb/convenience.h"
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#include "rocksdb/env.h"
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#include "table/format.h"
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#include "util/coding.h"
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#include "util/string_util.h"
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namespace ROCKSDB_NAMESPACE {
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namespace blob_db {
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BlobDumpTool::BlobDumpTool()
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: reader_(nullptr), buffer_(nullptr), buffer_size_(0) {}
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Status BlobDumpTool::Run(const std::string& filename, DisplayType show_key,
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DisplayType show_blob,
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DisplayType show_uncompressed_blob,
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bool show_summary) {
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constexpr size_t kReadaheadSize = 2 * 1024 * 1024;
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Status s;
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Env* env = Env::Default();
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s = env->FileExists(filename);
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if (!s.ok()) {
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return s;
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}
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uint64_t file_size = 0;
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s = env->GetFileSize(filename, &file_size);
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if (!s.ok()) {
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return s;
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}
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std::unique_ptr<RandomAccessFile> file;
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s = env->NewRandomAccessFile(filename, &file, EnvOptions());
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if (!s.ok()) {
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return s;
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}
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file = NewReadaheadRandomAccessFile(std::move(file), kReadaheadSize);
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if (file_size == 0) {
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return Status::Corruption("File is empty.");
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}
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reader_.reset(new RandomAccessFileReader(
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NewLegacyRandomAccessFileWrapper(file), filename));
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uint64_t offset = 0;
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uint64_t footer_offset = 0;
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CompressionType compression = kNoCompression;
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s = DumpBlobLogHeader(&offset, &compression);
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if (!s.ok()) {
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return s;
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}
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s = DumpBlobLogFooter(file_size, &footer_offset);
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if (!s.ok()) {
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return s;
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}
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uint64_t total_records = 0;
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uint64_t total_key_size = 0;
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uint64_t total_blob_size = 0;
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uint64_t total_uncompressed_blob_size = 0;
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if (show_key != DisplayType::kNone || show_summary) {
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while (offset < footer_offset) {
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s = DumpRecord(show_key, show_blob, show_uncompressed_blob, show_summary,
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compression, &offset, &total_records, &total_key_size,
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&total_blob_size, &total_uncompressed_blob_size);
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if (!s.ok()) {
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break;
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}
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}
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}
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if (show_summary) {
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fprintf(stdout, "Summary:\n");
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fprintf(stdout, " total records: %" PRIu64 "\n", total_records);
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fprintf(stdout, " total key size: %" PRIu64 "\n", total_key_size);
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fprintf(stdout, " total blob size: %" PRIu64 "\n", total_blob_size);
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if (compression != kNoCompression) {
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fprintf(stdout, " total raw blob size: %" PRIu64 "\n",
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total_uncompressed_blob_size);
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}
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}
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return s;
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}
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Status BlobDumpTool::Read(uint64_t offset, size_t size, Slice* result) {
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if (buffer_size_ < size) {
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if (buffer_size_ == 0) {
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buffer_size_ = 4096;
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}
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while (buffer_size_ < size) {
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buffer_size_ *= 2;
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}
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buffer_.reset(new char[buffer_size_]);
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}
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Status s =
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reader_->Read(IOOptions(), offset, size, result, buffer_.get(), nullptr);
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if (!s.ok()) {
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return s;
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}
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if (result->size() != size) {
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return Status::Corruption("Reach the end of the file unexpectedly.");
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}
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return s;
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}
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Status BlobDumpTool::DumpBlobLogHeader(uint64_t* offset,
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CompressionType* compression) {
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Slice slice;
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Status s = Read(0, BlobLogHeader::kSize, &slice);
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if (!s.ok()) {
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return s;
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}
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BlobLogHeader header;
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s = header.DecodeFrom(slice);
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if (!s.ok()) {
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return s;
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}
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fprintf(stdout, "Blob log header:\n");
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fprintf(stdout, " Version : %" PRIu32 "\n", header.version);
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fprintf(stdout, " Column Family ID : %" PRIu32 "\n",
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header.column_family_id);
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std::string compression_str;
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if (!GetStringFromCompressionType(&compression_str, header.compression)
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.ok()) {
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compression_str = "Unrecongnized compression type (" +
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ToString((int)header.compression) + ")";
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}
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fprintf(stdout, " Compression : %s\n", compression_str.c_str());
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fprintf(stdout, " Expiration range : %s\n",
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GetString(header.expiration_range).c_str());
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*offset = BlobLogHeader::kSize;
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*compression = header.compression;
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return s;
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}
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Status BlobDumpTool::DumpBlobLogFooter(uint64_t file_size,
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uint64_t* footer_offset) {
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auto no_footer = [&]() {
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*footer_offset = file_size;
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fprintf(stdout, "No blob log footer.\n");
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return Status::OK();
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};
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if (file_size < BlobLogHeader::kSize + BlobLogFooter::kSize) {
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return no_footer();
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}
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Slice slice;
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*footer_offset = file_size - BlobLogFooter::kSize;
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Status s = Read(*footer_offset, BlobLogFooter::kSize, &slice);
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if (!s.ok()) {
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return s;
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}
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BlobLogFooter footer;
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s = footer.DecodeFrom(slice);
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if (!s.ok()) {
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return no_footer();
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}
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fprintf(stdout, "Blob log footer:\n");
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fprintf(stdout, " Blob count : %" PRIu64 "\n", footer.blob_count);
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fprintf(stdout, " Expiration Range : %s\n",
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GetString(footer.expiration_range).c_str());
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return s;
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}
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Status BlobDumpTool::DumpRecord(DisplayType show_key, DisplayType show_blob,
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DisplayType show_uncompressed_blob,
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bool show_summary, CompressionType compression,
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uint64_t* offset, uint64_t* total_records,
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uint64_t* total_key_size,
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uint64_t* total_blob_size,
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uint64_t* total_uncompressed_blob_size) {
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if (show_key != DisplayType::kNone) {
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fprintf(stdout, "Read record with offset 0x%" PRIx64 " (%" PRIu64 "):\n",
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*offset, *offset);
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}
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Slice slice;
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Status s = Read(*offset, BlobLogRecord::kHeaderSize, &slice);
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if (!s.ok()) {
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return s;
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}
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BlobLogRecord record;
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s = record.DecodeHeaderFrom(slice);
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if (!s.ok()) {
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return s;
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}
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uint64_t key_size = record.key_size;
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uint64_t value_size = record.value_size;
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if (show_key != DisplayType::kNone) {
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fprintf(stdout, " key size : %" PRIu64 "\n", key_size);
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fprintf(stdout, " value size : %" PRIu64 "\n", value_size);
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fprintf(stdout, " expiration : %" PRIu64 "\n", record.expiration);
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}
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*offset += BlobLogRecord::kHeaderSize;
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s = Read(*offset, static_cast<size_t>(key_size + value_size), &slice);
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if (!s.ok()) {
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return s;
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}
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// Decompress value
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std::string uncompressed_value;
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if (compression != kNoCompression &&
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(show_uncompressed_blob != DisplayType::kNone || show_summary)) {
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BlockContents contents;
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UncompressionContext context(compression);
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UncompressionInfo info(context, UncompressionDict::GetEmptyDict(),
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compression);
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s = UncompressBlockContentsForCompressionType(
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info, slice.data() + key_size, static_cast<size_t>(value_size),
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&contents, 2 /*compress_format_version*/,
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ImmutableCFOptions(Options()));
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if (!s.ok()) {
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return s;
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}
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uncompressed_value = contents.data.ToString();
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}
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if (show_key != DisplayType::kNone) {
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fprintf(stdout, " key : ");
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DumpSlice(Slice(slice.data(), static_cast<size_t>(key_size)), show_key);
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if (show_blob != DisplayType::kNone) {
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fprintf(stdout, " blob : ");
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DumpSlice(Slice(slice.data() + static_cast<size_t>(key_size), static_cast<size_t>(value_size)), show_blob);
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}
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if (show_uncompressed_blob != DisplayType::kNone) {
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fprintf(stdout, " raw blob : ");
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DumpSlice(Slice(uncompressed_value), show_uncompressed_blob);
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}
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}
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*offset += key_size + value_size;
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*total_records += 1;
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*total_key_size += key_size;
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*total_blob_size += value_size;
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*total_uncompressed_blob_size += uncompressed_value.size();
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return s;
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}
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void BlobDumpTool::DumpSlice(const Slice s, DisplayType type) {
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if (type == DisplayType::kRaw) {
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fprintf(stdout, "%s\n", s.ToString().c_str());
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} else if (type == DisplayType::kHex) {
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fprintf(stdout, "%s\n", s.ToString(true /*hex*/).c_str());
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} else if (type == DisplayType::kDetail) {
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char buf[100];
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for (size_t i = 0; i < s.size(); i += 16) {
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memset(buf, 0, sizeof(buf));
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for (size_t j = 0; j < 16 && i + j < s.size(); j++) {
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unsigned char c = s[i + j];
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snprintf(buf + j * 3 + 15, 2, "%x", c >> 4);
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snprintf(buf + j * 3 + 16, 2, "%x", c & 0xf);
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snprintf(buf + j + 65, 2, "%c", (0x20 <= c && c <= 0x7e) ? c : '.');
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}
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for (size_t p = 0; p + 1 < sizeof(buf); p++) {
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if (buf[p] == 0) {
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buf[p] = ' ';
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}
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}
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fprintf(stdout, "%s\n", i == 0 ? buf + 15 : buf);
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}
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}
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}
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template <class T>
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std::string BlobDumpTool::GetString(std::pair<T, T> p) {
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if (p.first == 0 && p.second == 0) {
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return "nil";
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}
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return "(" + ToString(p.first) + ", " + ToString(p.second) + ")";
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}
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} // namespace blob_db
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} // namespace ROCKSDB_NAMESPACE
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#endif // ROCKSDB_LITE
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