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#include "ServerHttp2.h"
#include "../../utils/Utils.h"
#include "../../transfer/http2/HPack.h"
#include <array>
namespace HttpServer
{
ServerHttp2::ServerHttp2(
Socket::Adapter &sock,
const ServerSettings &settings,
ServerControls &controls,
SocketsQueue &sockets
) noexcept
: ServerHttp2Protocol(sock, settings, controls, nullptr), sockets(sockets)
{
}
void ServerHttp2::close() {
this->sock.close();
}
static uint8_t *setHttp2FrameHeader(
uint8_t *addr,
const uint32_t frameSize,
const Http2::FrameType frameType,
const Http2::FrameFlag frameFlags,
const uint32_t streamId
) noexcept {
Utils::hton24(addr, frameSize);
*(addr + 3) = static_cast<const uint8_t>(frameType);
*(addr + 4) = static_cast<const uint8_t>(frameFlags);
*reinterpret_cast<uint32_t *>(addr + 5) = ::htonl(streamId);
return (addr + Http2::FRAME_HEADER_SIZE);
}
static Http2::IncStream &getStreamData(
std::unordered_map<uint32_t, Http2::IncStream> &streams,
const uint32_t streamId,
Http2::ConnectionData &conn
) noexcept {
auto it = streams.find(streamId);
if (streams.end() != it) {
return it->second;
}
return streams.emplace(streamId, Http2::IncStream(streamId, conn) ).first->second;
}
static void sendWindowUpdate(
const Socket::Adapter &sock,
const std::chrono::milliseconds &timeout,
const Http2::IncStream &stream,
const uint32_t size
) noexcept {
std::array<uint8_t, Http2::FRAME_HEADER_SIZE + sizeof(uint32_t)> buf;
uint8_t *addr = buf.data();
addr = setHttp2FrameHeader(
addr,
sizeof(uint32_t),
Http2::FrameType::WINDOW_UPDATE,
Http2::FrameFlag::EMPTY,
stream.stream_id
);
*reinterpret_cast<uint32_t *>(addr) = ::htonl(size);
const std::unique_lock<std::mutex> lock(stream.conn.sync.mtx);
sock.nonblock_send(buf.data(), buf.size(), timeout);
}
static Http2::ErrorCode parseHttp2Data(
Http2::FrameMeta &meta,
Http2::IncStream &stream,
const uint8_t *src,
const uint8_t *end
) {
if (0 == meta.stream_id) {
return Http2::ErrorCode::PROTOCOL_ERROR;
}
if (Http2::StreamState::OPEN != stream.state) {
return Http2::ErrorCode::STREAM_CLOSED;
}
if (stream.window_size_inc <= 0) {
return Http2::ErrorCode::FLOW_CONTROL_ERROR;
}
uint8_t padding = 0;
if (meta.flags & Http2::FrameFlag::PADDED)
{
padding = *src;
if (padding >= meta.length) {
return Http2::ErrorCode::PROTOCOL_ERROR;
}
src += sizeof(uint8_t);
}
Http2::ErrorCode error_code = Http2::ErrorCode::NO_ERROR;
if (stream.reserved)
{
Transfer::request_data *rd = static_cast<Transfer::request_data *>(&stream);
DataVariant::DataReceiver *dr = reinterpret_cast<DataVariant::DataReceiver *>(stream.reserved);
std::string &buf = *reinterpret_cast<std::string *>(dr->reserved);
buf.append(src, end - padding);
dr->recv_total += size_t(end - src) - padding;
if (dr->data_variant->parse(buf, rd, dr) ) {
buf.erase(
0, buf.length() - dr->left
);
} else {
error_code = Http2::ErrorCode::PROTOCOL_ERROR;
}
} else {
error_code = Http2::ErrorCode::PROTOCOL_ERROR;
}
if (meta.flags & Http2::FrameFlag::END_STREAM) {
stream.state = Http2::StreamState::HALF_CLOSED;
ServerProtocol::destroyDataReceiver(stream.reserved);
stream.reserved = nullptr;
}
return error_code;
}
static Http2::ErrorCode parseHttp2Headers(
Http2::FrameMeta &meta,
Http2::IncStream &stream,
const uint8_t *src,
const uint8_t *end
) {
stream.state = (meta.flags & Http2::FrameFlag::END_STREAM)
? Http2::StreamState::HALF_CLOSED
: Http2::StreamState::OPEN;
uint8_t padding = 0;
if (meta.flags & Http2::FrameFlag::PADDED)
{
padding = *src;
if (padding >= meta.length) {
return Http2::ErrorCode::PROTOCOL_ERROR;
}
src += sizeof(uint8_t);
}
if (meta.flags & Http2::FrameFlag::PRIORITY)
{
// Stream id
const uint32_t depend_stream_id = ::ntohl(
*reinterpret_cast<const uint32_t *>(src)
) & ~(uint32_t(1) << 31);
src += sizeof(uint32_t);
// Priority weight
stream.priority = *src;
src += sizeof(uint8_t);
}
if (HPack::unpack(src, size_t(end - src) - padding, stream) == false) {
return Http2::ErrorCode::COMPRESSION_ERROR;
}
return Http2::ErrorCode::NO_ERROR;
}
static Http2::ErrorCode parseHttp2rstStream(
Http2::FrameMeta &meta,
Http2::IncStream &stream,
const uint8_t *src,
const uint8_t *end
) {
if (Http2::StreamState::IDLE == stream.state) {
return Http2::ErrorCode::PROTOCOL_ERROR;
}
stream.state = Http2::StreamState::CLOSED;
if (0 == meta.stream_id) {
return Http2::ErrorCode::PROTOCOL_ERROR;
}
if (sizeof(uint32_t) != meta.length) {
return Http2::ErrorCode::FRAME_SIZE_ERROR;
}
const Http2::ErrorCode error_code = static_cast<const Http2::ErrorCode>(
::ntohl(*reinterpret_cast<const uint32_t *>(src) )
);
if (Http2::ErrorCode::NO_ERROR != error_code) {
// DEBUG
}
return Http2::ErrorCode::NO_ERROR;
}
static Http2::ErrorCode parseHttp2Settings(
Http2::FrameMeta &meta,
Http2::IncStream &stream,
const uint8_t *src,
const uint8_t *end
) {
if (0 != meta.stream_id) {
return Http2::ErrorCode::PROTOCOL_ERROR;
}
if (meta.length % (sizeof(uint16_t) + sizeof(uint32_t) ) ) {
return Http2::ErrorCode::FRAME_SIZE_ERROR;
}
if (Http2::StreamState::OPEN != stream.state) {
stream.state = Http2::StreamState::OPEN;
}
Http2::ConnectionSettings &settings = stream.conn.client_settings;
while (src != end)
{
const Http2::ConnectionSetting setting = static_cast<Http2::ConnectionSetting>(
ntohs(*reinterpret_cast<const uint16_t *>(src) )
);
src += sizeof(uint16_t);
const uint32_t value = ::ntohl(*reinterpret_cast<const uint32_t *>(src) );
src += sizeof(uint32_t);
switch (setting)
{
case Http2::ConnectionSetting::SETTINGS_HEADER_TABLE_SIZE: {
settings.header_table_size = value;
break;
}
case Http2::ConnectionSetting::SETTINGS_ENABLE_PUSH: {
if (value > 1) {
return Http2::ErrorCode::PROTOCOL_ERROR;
}
settings.enable_push = value;
break;
}
case Http2::ConnectionSetting::SETTINGS_MAX_CONCURRENT_STREAMS: {
settings.max_concurrent_streams = value;
break;
}
case Http2::ConnectionSetting::SETTINGS_INITIAL_WINDOW_SIZE: {
if (value >= uint32_t(1) << 31) {
return Http2::ErrorCode::FLOW_CONTROL_ERROR;
}
settings.initial_window_size = value;
break;
}
case Http2::ConnectionSetting::SETTINGS_MAX_FRAME_SIZE: {
if (value < (1 << 14) || value >= (1 << 24) ) {
return Http2::ErrorCode::PROTOCOL_ERROR;
}
settings.max_frame_size = value;
break;
}
case Http2::ConnectionSetting::SETTINGS_MAX_HEADER_LIST_SIZE: {
settings.max_header_list_size = value;
break;
}
default:
break;
}
}
return Http2::ErrorCode::NO_ERROR;
}
static Http2::ErrorCode parseHttp2GoAway(
Http2::FrameMeta &meta,
Http2::IncStream &stream,
const uint8_t *src,
const uint8_t *end
) {
if (0 != meta.stream_id) {
return Http2::ErrorCode::PROTOCOL_ERROR;
}
stream.state = Http2::StreamState::CLOSED;
const uint32_t last_stream_id = ::ntohl(
*reinterpret_cast<const uint32_t *>(src)
);
if (last_stream_id > 0) {
}
src += sizeof(uint32_t);
const Http2::ErrorCode error_code = static_cast<Http2::ErrorCode>(
::ntohl(*reinterpret_cast<const uint32_t *>(src) )
);
if (Http2::ErrorCode::NO_ERROR != error_code) {
}
return Http2::ErrorCode::NO_ERROR;
}
static void ping(
const Socket::Adapter &sock,
const std::chrono::milliseconds &timeout,
Http2::ConnectionData &conn,
const uint64_t pingData
) {
constexpr uint32_t frame_size = sizeof(uint64_t);
std::array<uint8_t, Http2::FRAME_HEADER_SIZE + frame_size> buf;
uint8_t *addr = buf.data();
constexpr uint32_t stream_id = 0;
addr = setHttp2FrameHeader(
addr,
frame_size,
Http2::FrameType::PING,
Http2::FrameFlag::ACK,
stream_id
);
*reinterpret_cast<uint64_t *>(addr) = pingData;
const std::unique_lock<std::mutex> lock(conn.sync.mtx);
sock.nonblock_send(buf.data(), buf.size(), timeout);
}
static Http2::ErrorCode parseHttp2Ping(
Http2::FrameMeta &meta
) {
if (0 != meta.stream_id) {
return Http2::ErrorCode::PROTOCOL_ERROR;
}
if (sizeof(uint64_t) != meta.length) {
return Http2::ErrorCode::FRAME_SIZE_ERROR;
}
return Http2::ErrorCode::NO_ERROR;
}
static Http2::ErrorCode parseHttp2WindowUpdate(
Http2::FrameMeta &meta,
Http2::IncStream &stream,
const uint8_t *src,
const uint8_t *end
) {
if (Http2::StreamState::RESERVED == stream.state) {
return Http2::ErrorCode::PROTOCOL_ERROR;
}
else if (Http2::StreamState::OPEN != stream.state) {
return Http2::ErrorCode::NO_ERROR;
}
if (sizeof(uint32_t) != meta.length) {
return Http2::ErrorCode::FRAME_SIZE_ERROR;
}
const uint32_t window_size_increment = ::ntohl(
*reinterpret_cast<const uint32_t *>(src)
);
if (0 == window_size_increment) {
return Http2::ErrorCode::PROTOCOL_ERROR;
}
else if (window_size_increment >= uint32_t(1) << 31) {
return Http2::ErrorCode::FLOW_CONTROL_ERROR;
}
if (0 == meta.stream_id) {
// TODO: update all streams
stream.window_size_out += window_size_increment;
} else {
stream.window_size_out += window_size_increment;
}
return Http2::ErrorCode::NO_ERROR;
}
static void rstStream(
const Socket::Adapter &sock,
const std::chrono::milliseconds &timeout,
Http2::IncStream &stream,
const Http2::ErrorCode errorCode
) {
constexpr uint32_t frame_size = sizeof(uint32_t);
std::array<uint8_t, Http2::FRAME_HEADER_SIZE + frame_size> buf;
uint8_t *addr = buf.data();
addr = setHttp2FrameHeader(
addr,
frame_size,
Http2::FrameType::RST_STREAM,
Http2::FrameFlag::EMPTY,
stream.stream_id
);
*reinterpret_cast<uint32_t *>(addr) = ::htonl(
static_cast<const uint32_t>(errorCode)
);
const std::unique_lock<std::mutex> lock(stream.conn.sync.mtx);
sock.nonblock_send(buf.data(), buf.size(), timeout);
}
static void sendSettings(
const Socket::Adapter &sock,
const std::chrono::milliseconds &timeout,
Http2::ConnectionData &conn,
const uint8_t *src,
const uint8_t *end
) {
const uint32_t frame_size = uint32_t(end - src);
std::vector<uint8_t> buf(Http2::FRAME_HEADER_SIZE + frame_size);
uint8_t *addr = buf.data();
constexpr uint32_t stream_id = 0;
addr = setHttp2FrameHeader(
addr,
frame_size,
Http2::FrameType::SETTINGS,
Http2::FrameFlag::EMPTY,
stream_id
);
std::copy(src, end, addr);
const std::unique_lock<std::mutex> lock(conn.sync.mtx);
sock.nonblock_send(buf.data(), buf.size(), timeout);
}
static void goAway(
const Socket::Adapter &sock,
const std::chrono::milliseconds &timeout,
Http2::ConnectionData &conn,
const uint32_t lastStreamId,
const Http2::ErrorCode errorCode
) {
constexpr uint32_t frame_size = sizeof(uint32_t) * 2;
std::array<uint8_t, Http2::FRAME_HEADER_SIZE + frame_size> buf;
uint8_t *addr = buf.data();
addr = setHttp2FrameHeader(
addr,
frame_size,
Http2::FrameType::RST_STREAM,
Http2::FrameFlag::EMPTY,
0
);
*reinterpret_cast<uint32_t *>(addr) = ::htonl(lastStreamId);
*reinterpret_cast<uint32_t *>(addr + sizeof(uint32_t) ) = ::htonl(
static_cast<const uint32_t>(errorCode)
);
const std::unique_lock<std::mutex> lock(conn.sync.mtx);
sock.nonblock_send(buf.data(), buf.size(), timeout);
}
static bool getClientPreface(
const Socket::Adapter &sock,
const std::chrono::milliseconds &timeout
) {
std::array<uint8_t, 24> buf;
const long read_size = sock.nonblock_recv(
buf.data(),
buf.size(),
timeout
);
if (buf.size() != read_size) {
return false;
}
static constexpr char client_preface_data[] = "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n";
const uint64_t *left = reinterpret_cast<const uint64_t *>(client_preface_data);
const uint64_t *right = reinterpret_cast<const uint64_t *>(buf.data() );
uint64_t compare = 0;
compare |= left[0] ^ right[0];
compare |= left[1] ^ right[1];
compare |= left[2] ^ right[2];
return 0 == compare;
}
static void sendEmptySettings(
const Socket::Adapter &sock,
const std::chrono::milliseconds &timeout,
Http2::ConnectionData &conn,
const Http2::FrameFlag flags
) {
constexpr uint32_t frame_size = 0;
std::array<uint8_t, Http2::FRAME_HEADER_SIZE + frame_size> buf;
uint8_t *addr = buf.data();
constexpr uint32_t stream_id = 0;
addr = setHttp2FrameHeader(
addr,
frame_size,
Http2::FrameType::SETTINGS,
flags,
stream_id
);
const std::unique_lock<std::mutex> lock(conn.sync.mtx);
sock.nonblock_send(buf.data(), buf.size(), timeout);
}
static bool getNextHttp2FrameMeta(
const Socket::Adapter &sock,
const std::chrono::milliseconds &timeout,
std::vector<char> &buf,
Http2::FrameMeta &meta,
long &read_size
) {
const long length = long(
meta.length + Http2::FRAME_HEADER_SIZE
);
if (read_size <= length) {
if (read_size == length) {
read_size = 0;
}
read_size = sock.nonblock_recv(
buf.data() + read_size,
buf.size() - size_t(read_size),
timeout
);
if (read_size < long(Http2::FRAME_HEADER_SIZE) ) {
return false;
}
} else {
std::copy(
buf.data() + length,
buf.data() + read_size,
buf.data()
);
read_size -= length;
}
const uint8_t *addr = reinterpret_cast<const uint8_t *>(buf.data() );
meta.length = Utils::ntoh24(addr);
meta.type = static_cast<Http2::FrameType>(*(addr + 3) );
meta.flags = static_cast<Http2::FrameFlag>(*(addr + 4) );
meta.stream_id = ::ntohl(*reinterpret_cast<const uint32_t *>(addr + 5) );
return true;
}
ServerProtocol *ServerHttp2::process()
{
struct Request req;
req.timeout = std::chrono::milliseconds(15000);
req.protocol_variant = Transfer::ProtocolVariant::HTTP_2;
Http2::ConnectionData conn;
sendEmptySettings(
this->sock,
req.timeout,
conn,
Http2::FrameFlag::EMPTY
);
if (getClientPreface(this->sock, req.timeout) == false) {
constexpr uint32_t last_stream_id = 0;
goAway(
this->sock,
req.timeout,
conn,
last_stream_id,
Http2::ErrorCode::PROTOCOL_ERROR
);
return this;
}
conn.client_settings = Http2::ConnectionSettings::defaultSettings();
conn.server_settings = Http2::ConnectionSettings::defaultSettings();
std::vector<char> buf(conn.server_settings.max_frame_size);
std::unordered_map<uint32_t, Http2::IncStream> streams {
{ 0, Http2::IncStream(0, conn) }
};
Http2::IncStream &primary = streams.find(0)->second;
this->stream = &primary;
size_t streams_process_count = 0;
uint32_t last_stream_id = 0;
Http2::FrameMeta meta {};
long read_size = 0;
do {
if (getNextHttp2FrameMeta(this->sock, req.timeout, buf, meta, read_size) == false) {
break;
}
const uint8_t *addr = reinterpret_cast<const uint8_t *>(
buf.data()
) + Http2::FRAME_HEADER_SIZE;
const uint8_t *end = addr + meta.length;
if (meta.stream_id > last_stream_id) {
last_stream_id = meta.stream_id;
}
Http2::IncStream &stream = getStreamData(streams, meta.stream_id, conn);
if (Http2::StreamState::CLOSED == stream.state) {
rstStream(this->sock, req.timeout, stream, Http2::ErrorCode::STREAM_CLOSED);
continue;
}
if (meta.type != Http2::FrameType::CONTINUATION) {
stream.frame_type = meta.type;
}
Http2::ErrorCode result = Http2::ErrorCode::NO_ERROR;
switch (stream.frame_type)
{
case Http2::FrameType::DATA:
{
result = parseHttp2Data(meta, stream, addr, end);
stream.window_size_inc -= meta.length;
if (stream.reserved)
{
DataVariant::DataReceiver *dr = reinterpret_cast<DataVariant::DataReceiver *>(stream.reserved);
if (stream.window_size_inc - long(conn.server_settings.max_frame_size) <= 0)
{
size_t update_size = conn.server_settings.initial_window_size +
(dr->full_size - dr->recv_total) - size_t(stream.window_size_inc);
if (update_size > Http2::MAX_WINDOW_UPDATE) {
update_size = Http2::MAX_WINDOW_UPDATE;
}
sendWindowUpdate(this->sock, req.timeout, stream, uint32_t(update_size) );
sendWindowUpdate(this->sock, req.timeout, primary, uint32_t(update_size) );
stream.window_size_inc += update_size;
}
}
break;
}
case Http2::FrameType::HEADERS:
{
result = parseHttp2Headers(meta, stream, addr, end);
if (meta.flags & Http2::FrameFlag::END_HEADERS)
{
Transfer::request_data *rd = static_cast<Transfer::request_data *>(&stream);
stream.reserved = createDataReceiver(rd, this->settings.variants);
if (stream.reserved) {
DataVariant::DataReceiver *dr = reinterpret_cast<DataVariant::DataReceiver *>(stream.reserved);
dr->reserved = new std::string();
}
}
break;
}
case Http2::FrameType::PRIORITY:
result = Http2::ErrorCode::NO_ERROR;
break;
case Http2::FrameType::RST_STREAM:
result = parseHttp2rstStream(meta, stream, addr, end);
break;
case Http2::FrameType::SETTINGS:
{
result = parseHttp2Settings(meta, stream, addr, end);
if (Http2::ErrorCode::NO_ERROR == result && (meta.flags & Http2::FrameFlag::ACK) == false)
{
conn.decoding_dynamic_table.changeHeaderTableSize(conn.client_settings.header_table_size);
conn.decoding_dynamic_table.changeMaxHeaderListSize(conn.client_settings.max_header_list_size);
sendEmptySettings(this->sock, req.timeout, conn, Http2::FrameFlag::ACK);
}
break;
}
case Http2::FrameType::PUSH_PROMISE:
result = Http2::ErrorCode::NO_ERROR;
break;
case Http2::FrameType::PING:
{
result = parseHttp2Ping(meta);
if (Http2::ErrorCode::NO_ERROR == result && (meta.flags & Http2::FrameFlag::ACK) == false)
{
const uint64_t ping_data = *reinterpret_cast<const uint64_t *>(addr);
ping(this->sock, req.timeout, conn, ping_data);
}
break;
}
case Http2::FrameType::GOAWAY:
result = parseHttp2GoAway(meta, stream, addr, end);
break;
case Http2::FrameType::WINDOW_UPDATE:
result = parseHttp2WindowUpdate(meta, stream, addr, end);
break;
default:
result = Http2::ErrorCode::PROTOCOL_ERROR;
break;
}
if (result != Http2::ErrorCode::NO_ERROR)
{
stream.state = Http2::StreamState::CLOSED;
rstStream(this->sock, req.timeout, stream, result);
// TODO: remove closed stream(s) from unordered map
}
else if ( (meta.flags & Http2::FrameFlag::END_STREAM) && meta.stream_id != 0)
{
stream.reserved = this->sock.get_tls_session();
sockets.lock();
sockets.emplace(
std::tuple<Socket::Socket, Http2::IncStream *> {
Socket::Socket(this->sock.get_handle() ),
&stream
}
);
sockets.unlock();
this->controls.eventProcessQueue->notify();
++streams_process_count;
}
}
while (Http2::StreamState::CLOSED != primary.state);
while (conn.sync.completed.load() < streams_process_count) {
conn.sync.event.wait();
}
goAway(
this->sock,
req.timeout,
conn,
last_stream_id,
Http2::ErrorCode::NO_ERROR
);
for (auto &pair : streams) {
destroyDataReceiver(pair.second.reserved);
}
return this;
}
}
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