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/*
* This file is part of PowerDNS or dnsdist.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#pragma once
#include "config.h"
#if defined(HAVE_DNS_OVER_HTTPS) && defined(HAVE_NGHTTP2)
#include <nghttp2/nghttp2.h>
#include "dnsdist-tcp-upstream.hh"
class IncomingHTTP2Connection : public IncomingTCPConnectionState
{
public:
using StreamID = int32_t;
class PendingQuery
{
public:
enum class Method : uint8_t
{
Unknown,
Get,
Post,
Unsupported
};
PacketBuffer d_buffer;
PacketBuffer d_response;
std::string d_path;
std::string d_scheme;
std::string d_host;
std::string d_queryString;
std::string d_sni;
std::string d_contentTypeOut;
std::unique_ptr<HeadersMap> d_headers;
size_t d_queryPos{0};
uint32_t d_statusCode{0};
Method d_method{Method::Unknown};
};
IncomingHTTP2Connection(ConnectionInfo&& connectionInfo, TCPClientThreadData& threadData, const struct timeval& now);
~IncomingHTTP2Connection() = default;
void handleIO() override;
void handleResponse(const struct timeval& now, TCPResponse&& response) override;
void notifyIOError(const struct timeval& now, TCPResponse&& response) override;
bool active() const override;
private:
static ssize_t send_callback(nghttp2_session* session, const uint8_t* data, size_t length, int flags, void* user_data);
static int on_frame_recv_callback(nghttp2_session* session, const nghttp2_frame* frame, void* user_data);
static int on_data_chunk_recv_callback(nghttp2_session* session, uint8_t flags, StreamID stream_id, const uint8_t* data, size_t len, void* user_data);
static int on_stream_close_callback(nghttp2_session* session, StreamID stream_id, uint32_t error_code, void* user_data);
static int on_header_callback(nghttp2_session* session, const nghttp2_frame* frame, const uint8_t* name, size_t namelen, const uint8_t* value, size_t valuelen, uint8_t flags, void* user_data);
static int on_begin_headers_callback(nghttp2_session* session, const nghttp2_frame* frame, void* user_data);
static int on_error_callback(nghttp2_session* session, int lib_error_code, const char* msg, size_t len, void* user_data);
static void handleReadableIOCallback(int descriptor, FDMultiplexer::funcparam_t& param);
static void handleWritableIOCallback(int descriptor, FDMultiplexer::funcparam_t& param);
static constexpr size_t s_initialReceiveBufferSize{256U};
IOState sendResponse(const struct timeval& now, TCPResponse&& response) override;
bool forwardViaUDPFirst() const override
{
return true;
}
void restoreDOHUnit(std::unique_ptr<DOHUnitInterface>&&) override;
std::unique_ptr<DOHUnitInterface> getDOHUnit(uint32_t streamID) override;
void stopIO();
uint32_t getConcurrentStreamsCount() const;
void updateIO(IOState newState, const FDMultiplexer::callbackfunc_t& callback);
void handleIOError();
bool sendResponse(StreamID streamID, PendingQuery& context, uint16_t responseCode, const HeadersMap& customResponseHeaders, const std::string& contentType = "", bool addContentType = true);
void handleIncomingQuery(PendingQuery&& query, StreamID streamID);
bool checkALPN();
IOState readHTTPData();
void handleConnectionReady();
IOState handleHandshake(const struct timeval& now) override;
bool hasPendingWrite() const;
void writeToSocket(bool socketReady);
boost::optional<struct timeval> getIdleClientReadTTD(struct timeval now) const;
std::unique_ptr<nghttp2_session, decltype(&nghttp2_session_del)> d_session{nullptr, nghttp2_session_del};
std::unordered_map<StreamID, PendingQuery> d_currentStreams;
PacketBuffer d_out;
PacketBuffer d_in;
size_t d_outPos{0};
/* this connection is done, the remote end has closed the connection
or something like that. We do not want to try to write to it. */
bool d_connectionDied{false};
/* we are done reading from this connection, but we might still want to
write to it to close it properly */
bool d_connectionClosing{false};
/* Whether we are still waiting for more data to be buffered
before writing to the socket (false) or not. */
bool d_needFlush{false};
/* Whether we have data that we want to write to the socket,
but the socket is full. */
bool d_pendingWrite{false};
/* Whether we are currently inside the readHTTPData function,
which is not reentrant and could be called from itself via
the nghttp2 callbacks */
bool d_inReadFunction{false};
};
class NGHTTP2Headers
{
public:
enum class HeaderConstantIndexes
{
OK_200_VALUE = 0,
METHOD_NAME,
METHOD_VALUE,
SCHEME_NAME,
SCHEME_VALUE,
AUTHORITY_NAME,
X_FORWARDED_FOR_NAME,
PATH_NAME,
CONTENT_LENGTH_NAME,
STATUS_NAME,
LOCATION_NAME,
ACCEPT_NAME,
ACCEPT_VALUE,
CACHE_CONTROL_NAME,
CONTENT_TYPE_NAME,
CONTENT_TYPE_VALUE,
USER_AGENT_NAME,
USER_AGENT_VALUE,
X_FORWARDED_PORT_NAME,
X_FORWARDED_PROTO_NAME,
X_FORWARDED_PROTO_VALUE_DNS_OVER_UDP,
X_FORWARDED_PROTO_VALUE_DNS_OVER_TCP,
X_FORWARDED_PROTO_VALUE_DNS_OVER_TLS,
X_FORWARDED_PROTO_VALUE_DNS_OVER_HTTP,
X_FORWARDED_PROTO_VALUE_DNS_OVER_HTTPS,
COUNT
};
static void addStaticHeader(std::vector<nghttp2_nv>& headers, HeaderConstantIndexes nameKey, HeaderConstantIndexes valueKey);
static void addDynamicHeader(std::vector<nghttp2_nv>& headers, HeaderConstantIndexes nameKey, const std::string_view& value);
static void addCustomDynamicHeader(std::vector<nghttp2_nv>& headers, const std::string& name, const std::string_view& value);
};
#endif /* HAVE_DNS_OVER_HTTPS && HAVE_NGHTTP2 */
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