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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/at_exit.h"
#include "base/command_line.h"
#include "base/containers/span.h"
#include "base/files/file.h"
#include "base/files/file_util.h"
#include "base/strings/string_number_conversions.h"
#include "net/spdy/fuzzing/hpack_fuzz_util.h"
#include "net/third_party/quiche/src/quiche/common/http/http_header_block.h"
#include "net/third_party/quiche/src/quiche/http2/core/spdy_protocol.h"
#include "net/third_party/quiche/src/quiche/http2/hpack/hpack_constants.h"
#include "net/third_party/quiche/src/quiche/http2/hpack/hpack_encoder.h"
namespace {
// Target file for generated HPACK header sets.
const char kFileToWrite[] = "file-to-write";
// Number of header sets to generate.
const char kExampleCount[] = "example-count";
} // namespace
using spdy::HpackFuzzUtil;
using std::map;
// Generates a configurable number of header sets (using HpackFuzzUtil), and
// sequentially encodes each header set with an HpackEncoder. Encoded header
// sets are written to the output file in length-prefixed blocks.
int main(int argc, char** argv) {
base::AtExitManager exit_manager;
base::CommandLine::Init(argc, argv);
const base::CommandLine& command_line =
*base::CommandLine::ForCurrentProcess();
if (!command_line.HasSwitch(kFileToWrite) ||
!command_line.HasSwitch(kExampleCount)) {
LOG(ERROR) << "Usage: " << argv[0] << " --" << kFileToWrite
<< "=/path/to/file.out"
<< " --" << kExampleCount << "=1000";
return -1;
}
std::string file_to_write = command_line.GetSwitchValueASCII(kFileToWrite);
int example_count = 0;
base::StringToInt(command_line.GetSwitchValueASCII(kExampleCount),
&example_count);
DVLOG(1) << "Writing output to " << file_to_write;
base::File file_out(base::FilePath::FromUTF8Unsafe(file_to_write),
base::File::FLAG_CREATE_ALWAYS | base::File::FLAG_WRITE);
CHECK(file_out.IsValid()) << file_out.error_details();
HpackFuzzUtil::GeneratorContext context;
HpackFuzzUtil::InitializeGeneratorContext(&context);
spdy::HpackEncoder encoder;
for (int i = 0; i != example_count; ++i) {
quiche::HttpHeaderBlock headers =
HpackFuzzUtil::NextGeneratedHeaderSet(&context);
std::string buffer = encoder.EncodeHeaderBlock(headers);
std::string prefix = HpackFuzzUtil::HeaderBlockPrefix(buffer.size());
CHECK(file_out.WriteAtCurrentPos(base::as_byte_span(prefix)).has_value());
CHECK(file_out.WriteAtCurrentPos(base::as_byte_span(buffer)).has_value());
}
CHECK(file_out.Flush());
DVLOG(1) << "Generated " << example_count << " blocks.";
return 0;
}
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