359 lines
11 KiB
C++
359 lines
11 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#ifndef INCLUDED_WEBSOCKETHANDLER_HPP
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#define INCLUDED_WEBSOCKETHANDLER_HPP
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#include "Common.hpp"
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#include "Log.hpp"
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#include "Socket.hpp"
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#include <Poco/Net/HTTPRequest.h>
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#include <Poco/Net/WebSocket.h>
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class WebSocketHandler : public SocketHandlerInterface
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{
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protected:
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// The socket that owns us (we can't own it).
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std::weak_ptr<StreamSocket> _socket;
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std::vector<char> _wsPayload;
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bool _shuttingDown;
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enum class WSState { HTTP, WS } _wsState;
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enum class WSFrameMask : unsigned char
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{
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Fin = 0x80,
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Mask = 0x80
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};
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public:
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WebSocketHandler() :
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_shuttingDown(false),
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_wsState(WSState::HTTP)
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{
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}
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/// Upgrades itself to a websocket directly.
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WebSocketHandler(const std::weak_ptr<StreamSocket>& socket,
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const Poco::Net::HTTPRequest& request) :
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_socket(socket),
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_shuttingDown(false),
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_wsState(WSState::HTTP)
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{
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upgradeToWebSocket(request);
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}
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/// Implementation of the SocketHandlerInterface.
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void onConnect(const std::weak_ptr<StreamSocket>& socket) override
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{
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_socket = socket;
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}
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enum WSOpCode {
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Continuation, // 0x0
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Text, // 0x1
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Binary, // 0x2
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Reserved1, // 0x3
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Reserved2, // 0x4
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Reserved3, // 0x5
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Reserved4, // 0x6
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Reserved5, // 0x7
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Close, // 0x8
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Ping, // 0x9
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Pong // 0xa
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// ... reserved
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};
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/// Status codes sent to peer on shutdown.
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enum class StatusCodes : unsigned short
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{
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NORMAL_CLOSE = 1000,
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ENDPOINT_GOING_AWAY = 1001,
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PROTOCOL_ERROR = 1002,
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PAYLOAD_NOT_ACCEPTABLE = 1003,
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RESERVED = 1004,
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RESERVED_NO_STATUS_CODE = 1005,
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RESERVED_ABNORMAL_CLOSE = 1006,
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MALFORMED_PAYLOAD = 1007,
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POLICY_VIOLATION = 1008,
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PAYLOAD_TOO_BIG = 1009,
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EXTENSION_REQUIRED = 1010,
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UNEXPECTED_CONDITION = 1011,
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RESERVED_TLS_FAILURE = 1015
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};
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/// Sends WS shutdown message to the peer.
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void shutdown(const StatusCodes statusCode = StatusCodes::NORMAL_CLOSE, const std::string& statusMessage = "")
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{
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auto socket = _socket.lock();
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if (socket == nullptr)
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return;
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const size_t len = statusMessage.size();
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std::vector<char> buf(2 + len);
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buf[0] = ((((int)statusCode) >> 8) & 0xff);
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buf[1] = ((((int)statusCode) >> 0) & 0xff);
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std::copy(statusMessage.begin(), statusMessage.end(), buf.end());
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const unsigned char flags = static_cast<unsigned char>(WSFrameMask::Fin) | static_cast<char>(WSOpCode::Close);
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auto lock = socket->getWriteLock();
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sendFrame(socket, buf.data(), buf.size(), flags);
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_shuttingDown = true;
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}
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/// Implementation of the SocketHandlerInterface.
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virtual void handleIncomingMessage() override
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{
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auto socket = _socket.lock();
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if (socket == nullptr)
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return;
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// websocket fun !
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const size_t len = socket->_inBuffer.size();
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LOG_TRC("Incoming WebSocket data of " << len << " bytes to socket #" << socket->getFD());
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if (len < 2) // partial read
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return;
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unsigned char *p = reinterpret_cast<unsigned char*>(&socket->_inBuffer[0]);
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bool fin = p[0] & 0x80;
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WSOpCode code = static_cast<WSOpCode>(p[0] & 0x0f);
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bool hasMask = p[1] & 0x80;
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size_t payloadLen = p[1] & 0x7f;
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size_t headerLen = 2;
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// normally - 7 bit length.
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if (payloadLen == 126) // 2 byte length
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{
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if (len < 2 + 2)
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return;
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payloadLen = (((unsigned)p[2]) << 8) | ((unsigned)p[3]);
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headerLen += 2;
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}
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else if (payloadLen == 127) // 8 byte length
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{
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if (len < 2 + 8)
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return;
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payloadLen = ((((uint64_t)p[9]) << 0) + (((uint64_t)p[8]) << 8) +
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(((uint64_t)p[7]) << 16) + (((uint64_t)p[6]) << 24) +
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(((uint64_t)p[5]) << 32) + (((uint64_t)p[4]) << 40) +
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(((uint64_t)p[3]) << 48) + (((uint64_t)p[2]) << 56));
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// FIXME: crop read length to remove top / sign bits.
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headerLen += 8;
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}
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unsigned char *data, *mask;
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if (hasMask)
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{
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mask = p + headerLen;
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headerLen += 4;
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}
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if (payloadLen + headerLen > len)
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{ // partial read wait for more data.
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return;
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}
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data = p + headerLen;
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if (hasMask)
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{
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for (size_t i = 0; i < payloadLen; ++i)
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data[i] = data[i] ^ mask[i % 4];
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// FIXME: copy and un-mask at the same time ...
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_wsPayload.insert(_wsPayload.end(), data, data + payloadLen);
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} else
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_wsPayload.insert(_wsPayload.end(), data, data + payloadLen);
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socket->_inBuffer.erase(socket->_inBuffer.begin(), socket->_inBuffer.begin() + headerLen + payloadLen);
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// FIXME: fin, aggregating payloads into _wsPayload etc.
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LOG_TRC("Incoming WebSocket message code " << code << " fin? " << fin << " payload length " << _wsPayload.size());
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if (code & WSOpCode::Close)
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{
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if (!_shuttingDown)
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{
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// Peer-initiated shutdown must be echoed.
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// Otherwise, this is the echo to _out_ shutdown message.
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const StatusCodes statusCode = static_cast<StatusCodes>((static_cast<unsigned>(_wsPayload[0]) << 8) | _wsPayload[1]);
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if (_wsPayload.size() > 2)
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{
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const std::string message(&_wsPayload[2], &_wsPayload[2] + _wsPayload.size() - 2);
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shutdown(statusCode, message);
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}
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else
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{
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shutdown(statusCode);
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}
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}
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// TCP Close.
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socket->shutdown();
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}
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else
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{
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handleMessage(fin, code, _wsPayload);
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}
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_wsPayload.clear();
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}
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bool hasQueuedWrites() const override
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{
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LOG_TRC("WebSocket - asked for queued writes");
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return false;
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}
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void performWrites() override
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{
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assert(false);
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}
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void sendFrame(const std::string& msg) const
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{
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sendMessage(msg.data(), msg.size(), WSOpCode::Text);
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}
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/// Sends a WebSocket message of WPOpCode type.
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/// Returns the number of bytes written (including frame overhead) on success,
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/// 0 for closed/invalid socket, and -1 for other errors.
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int sendMessage(const char* data, const size_t len, const WSOpCode code, const bool flush = true) const
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{
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if (data == nullptr || len == 0)
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return -1;
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auto socket = _socket.lock();
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if (socket == nullptr)
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return -1; // no socket == error.
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auto lock = socket->getWriteLock();
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std::vector<char>& out = socket->_outBuffer;
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//TODO: Support fragmented messages.
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const unsigned char fin = static_cast<unsigned char>(WSFrameMask::Fin);
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// FIXME: need to support fragmented mesages, but for now send prefix message with size.
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if (len >= LARGE_MESSAGE_SIZE)
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{
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const std::string nextmessage = "nextmessage: size=" + std::to_string(len);
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const unsigned char size = (nextmessage.size() & 0xff);
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out.push_back(fin | WSOpCode::Text);
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out.push_back(size);
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out.insert(out.end(), nextmessage.data(), nextmessage.data() + size);
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socket->writeOutgoingData();
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}
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return sendFrame(socket, data, len, static_cast<unsigned char>(fin | code), flush);
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}
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protected:
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/// Sends a WebSocket frame given the data, length, and flags.
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/// Returns the number of bytes written (including frame overhead) on success,
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/// 0 for closed/invalid socket, and -1 for other errors.
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static int sendFrame(const std::shared_ptr<StreamSocket>& socket,
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const char* data, const size_t len,
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const unsigned char flags, const bool flush = true)
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{
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if (!socket || data == nullptr || len == 0)
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return -1;
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std::vector<char>& out = socket->_outBuffer;
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out.push_back(flags);
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if (len < 126)
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{
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out.push_back((char)len);
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}
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else if (len <= 0xffff)
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{
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out.push_back((char)126);
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out.push_back(static_cast<char>((len >> 8) & 0xff));
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out.push_back(static_cast<char>((len >> 0) & 0xff));
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}
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else
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{
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out.push_back((char)127);
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out.push_back(static_cast<char>((len >> 56) & 0xff));
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out.push_back(static_cast<char>((len >> 48) & 0xff));
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out.push_back(static_cast<char>((len >> 40) & 0xff));
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out.push_back(static_cast<char>((len >> 32) & 0xff));
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out.push_back(static_cast<char>((len >> 24) & 0xff));
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out.push_back(static_cast<char>((len >> 16) & 0xff));
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out.push_back(static_cast<char>((len >> 8) & 0xff));
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out.push_back(static_cast<char>((len >> 0) & 0xff));
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}
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// Copy the data.
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out.insert(out.end(), data, data + len);
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if (flush)
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socket->writeOutgoingData();
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// Data + header.
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return len + 2;
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}
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/// To be overriden to handle the websocket messages the way you need.
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virtual void handleMessage(bool /*fin*/, WSOpCode /*code*/, std::vector<char> &/*data*/)
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{
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}
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private:
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/// To make the protected 'computeAccept' accessible.
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class PublicComputeAccept : public Poco::Net::WebSocket
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{
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public:
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static std::string doComputeAccept(const std::string &key)
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{
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return computeAccept(key);
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}
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};
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protected:
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/// Upgrade the http(s) connection to a websocket.
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void upgradeToWebSocket(const Poco::Net::HTTPRequest& req)
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{
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LOG_TRC("Upgrading to WebSocket");
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assert(_wsState == WSState::HTTP);
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auto socket = _socket.lock();
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if (socket == nullptr)
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throw std::runtime_error("Invalid socket while upgrading to WebSocket. Request: " + req.getURI());
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// create our websocket goodness ...
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const int wsVersion = std::stoi(req.get("Sec-WebSocket-Version", "13"));
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const std::string wsKey = req.get("Sec-WebSocket-Key", "");
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const std::string wsProtocol = req.get("Sec-WebSocket-Protocol", "chat");
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// FIXME: other sanity checks ...
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LOG_INF("WebSocket version " << wsVersion << " key '" << wsKey << "'.");
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std::ostringstream oss;
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oss << "HTTP/1.1 101 Switching Protocols\r\n"
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<< "Upgrade: websocket\r\n"
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<< "Connection: Upgrade\r\n"
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<< "Sec-WebSocket-Accept: " << PublicComputeAccept::doComputeAccept(wsKey) << "\r\n"
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<< "\r\n";
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socket->send(oss.str());
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_wsState = WSState::WS;
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}
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};
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#endif
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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