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// Copyright (c) 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "quic/core/http/http_encoder.h"
#include <cstdint>
#include <memory>
#include "quic/core/crypto/quic_random.h"
#include "quic/core/quic_data_writer.h"
#include "quic/core/quic_types.h"
#include "quic/platform/api/quic_bug_tracker.h"
#include "quic/platform/api/quic_flag_utils.h"
#include "quic/platform/api/quic_flags.h"
#include "quic/platform/api/quic_logging.h"
namespace quic {
namespace {
bool WriteFrameHeader(QuicByteCount length,
HttpFrameType type,
QuicDataWriter* writer) {
return writer->WriteVarInt62(static_cast<uint64_t>(type)) &&
writer->WriteVarInt62(length);
}
QuicByteCount GetTotalLength(QuicByteCount payload_length, HttpFrameType type) {
return QuicDataWriter::GetVarInt62Len(payload_length) +
QuicDataWriter::GetVarInt62Len(static_cast<uint64_t>(type)) +
payload_length;
}
} // namespace
// static
QuicByteCount HttpEncoder::SerializeDataFrameHeader(
QuicByteCount payload_length,
std::unique_ptr<char[]>* output) {
QUICHE_DCHECK_NE(0u, payload_length);
QuicByteCount header_length = QuicDataWriter::GetVarInt62Len(payload_length) +
QuicDataWriter::GetVarInt62Len(
static_cast<uint64_t>(HttpFrameType::DATA));
output->reset(new char[header_length]);
QuicDataWriter writer(header_length, output->get());
if (WriteFrameHeader(payload_length, HttpFrameType::DATA, &writer)) {
return header_length;
}
QUIC_DLOG(ERROR)
<< "Http encoder failed when attempting to serialize data frame header.";
return 0;
}
// static
QuicByteCount HttpEncoder::SerializeHeadersFrameHeader(
QuicByteCount payload_length,
std::unique_ptr<char[]>* output) {
QUICHE_DCHECK_NE(0u, payload_length);
QuicByteCount header_length =
QuicDataWriter::GetVarInt62Len(payload_length) +
QuicDataWriter::GetVarInt62Len(
static_cast<uint64_t>(HttpFrameType::HEADERS));
output->reset(new char[header_length]);
QuicDataWriter writer(header_length, output->get());
if (WriteFrameHeader(payload_length, HttpFrameType::HEADERS, &writer)) {
return header_length;
}
QUIC_DLOG(ERROR)
<< "Http encoder failed when attempting to serialize headers "
"frame header.";
return 0;
}
// static
QuicByteCount HttpEncoder::SerializeSettingsFrame(
const SettingsFrame& settings,
std::unique_ptr<char[]>* output) {
QuicByteCount payload_length = 0;
std::vector<std::pair<uint64_t, uint64_t>> ordered_settings{
settings.values.begin(), settings.values.end()};
std::sort(ordered_settings.begin(), ordered_settings.end());
// Calculate the payload length.
for (const auto& p : ordered_settings) {
payload_length += QuicDataWriter::GetVarInt62Len(p.first);
payload_length += QuicDataWriter::GetVarInt62Len(p.second);
}
QuicByteCount total_length =
GetTotalLength(payload_length, HttpFrameType::SETTINGS);
output->reset(new char[total_length]);
QuicDataWriter writer(total_length, output->get());
if (!WriteFrameHeader(payload_length, HttpFrameType::SETTINGS, &writer)) {
QUIC_DLOG(ERROR) << "Http encoder failed when attempting to serialize "
"settings frame header.";
return 0;
}
for (const auto& p : ordered_settings) {
if (!writer.WriteVarInt62(p.first) || !writer.WriteVarInt62(p.second)) {
QUIC_DLOG(ERROR) << "Http encoder failed when attempting to serialize "
"settings frame payload.";
return 0;
}
}
return total_length;
}
// static
QuicByteCount HttpEncoder::SerializeGoAwayFrame(
const GoAwayFrame& goaway,
std::unique_ptr<char[]>* output) {
QuicByteCount payload_length = QuicDataWriter::GetVarInt62Len(goaway.id);
QuicByteCount total_length =
GetTotalLength(payload_length, HttpFrameType::GOAWAY);
output->reset(new char[total_length]);
QuicDataWriter writer(total_length, output->get());
if (WriteFrameHeader(payload_length, HttpFrameType::GOAWAY, &writer) &&
writer.WriteVarInt62(goaway.id)) {
return total_length;
}
QUIC_DLOG(ERROR)
<< "Http encoder failed when attempting to serialize goaway frame.";
return 0;
}
// static
QuicByteCount HttpEncoder::SerializePriorityUpdateFrame(
const PriorityUpdateFrame& priority_update,
std::unique_ptr<char[]>* output) {
if (priority_update.prioritized_element_type != REQUEST_STREAM) {
QUIC_BUG(quic_bug_10402_1)
<< "PRIORITY_UPDATE for push streams not implemented";
return 0;
}
QuicByteCount payload_length =
QuicDataWriter::GetVarInt62Len(priority_update.prioritized_element_id) +
priority_update.priority_field_value.size();
QuicByteCount total_length = GetTotalLength(
payload_length, HttpFrameType::PRIORITY_UPDATE_REQUEST_STREAM);
output->reset(new char[total_length]);
QuicDataWriter writer(total_length, output->get());
if (WriteFrameHeader(payload_length,
HttpFrameType::PRIORITY_UPDATE_REQUEST_STREAM,
&writer) &&
writer.WriteVarInt62(priority_update.prioritized_element_id) &&
writer.WriteBytes(priority_update.priority_field_value.data(),
priority_update.priority_field_value.size())) {
return total_length;
}
QUIC_DLOG(ERROR) << "Http encoder failed when attempting to serialize "
"PRIORITY_UPDATE frame.";
return 0;
}
// static
QuicByteCount HttpEncoder::SerializeAcceptChFrame(
const AcceptChFrame& accept_ch,
std::unique_ptr<char[]>* output) {
QuicByteCount payload_length = 0;
for (const auto& entry : accept_ch.entries) {
payload_length += QuicDataWriter::GetVarInt62Len(entry.origin.size());
payload_length += entry.origin.size();
payload_length += QuicDataWriter::GetVarInt62Len(entry.value.size());
payload_length += entry.value.size();
}
QuicByteCount total_length =
GetTotalLength(payload_length, HttpFrameType::ACCEPT_CH);
output->reset(new char[total_length]);
QuicDataWriter writer(total_length, output->get());
if (!WriteFrameHeader(payload_length, HttpFrameType::ACCEPT_CH, &writer)) {
QUIC_DLOG(ERROR)
<< "Http encoder failed to serialize ACCEPT_CH frame header.";
return 0;
}
for (const auto& entry : accept_ch.entries) {
if (!writer.WriteStringPieceVarInt62(entry.origin) ||
!writer.WriteStringPieceVarInt62(entry.value)) {
QUIC_DLOG(ERROR)
<< "Http encoder failed to serialize ACCEPT_CH frame payload.";
return 0;
}
}
return total_length;
}
// static
QuicByteCount HttpEncoder::SerializeGreasingFrame(
std::unique_ptr<char[]>* output) {
uint64_t frame_type;
QuicByteCount payload_length;
std::string payload;
if (!GetQuicFlag(FLAGS_quic_enable_http3_grease_randomness)) {
frame_type = 0x40;
payload_length = 1;
payload = "a";
} else {
uint32_t result;
QuicRandom::GetInstance()->RandBytes(&result, sizeof(result));
frame_type = 0x1fULL * static_cast<uint64_t>(result) + 0x21ULL;
// The payload length is random but within [0, 3];
payload_length = result % 4;
if (payload_length > 0) {
std::unique_ptr<char[]> buffer(new char[payload_length]);
QuicRandom::GetInstance()->RandBytes(buffer.get(), payload_length);
payload = std::string(buffer.get(), payload_length);
}
}
QuicByteCount total_length = QuicDataWriter::GetVarInt62Len(frame_type) +
QuicDataWriter::GetVarInt62Len(payload_length) +
payload_length;
output->reset(new char[total_length]);
QuicDataWriter writer(total_length, output->get());
bool success =
writer.WriteVarInt62(frame_type) && writer.WriteVarInt62(payload_length);
if (payload_length > 0) {
success &= writer.WriteBytes(payload.data(), payload_length);
}
if (success) {
return total_length;
}
QUIC_DLOG(ERROR) << "Http encoder failed when attempting to serialize "
"greasing frame.";
return 0;
}
QuicByteCount HttpEncoder::SerializeWebTransportStreamFrameHeader(
WebTransportSessionId session_id,
std::unique_ptr<char[]>* output) {
uint64_t stream_type =
static_cast<uint64_t>(HttpFrameType::WEBTRANSPORT_STREAM);
QuicByteCount header_length = QuicDataWriter::GetVarInt62Len(stream_type) +
QuicDataWriter::GetVarInt62Len(session_id);
*output = std::make_unique<char[]>(header_length);
QuicDataWriter writer(header_length, output->get());
bool success =
writer.WriteVarInt62(stream_type) && writer.WriteVarInt62(session_id);
if (success && writer.remaining() == 0) {
return header_length;
}
QUIC_DLOG(ERROR) << "Http encoder failed when attempting to serialize "
"WEBTRANSPORT_STREAM frame header.";
return 0;
}
} // namespace quic