mirror of
https://github.com/Telecominfraproject/wlan-cloud-lib-poco.git
synced 2025-11-04 12:38:02 +00:00
401 lines
8.9 KiB
C++
401 lines
8.9 KiB
C++
//
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// WebSocketImpl.cpp
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//
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// Library: Net
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// Package: WebSocket
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// Module: WebSocketImpl
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//
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// Copyright (c) 2012, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#define NOMINMAX
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#include "Poco/Net/WebSocketImpl.h"
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#include "Poco/Net/NetException.h"
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#include "Poco/Net/WebSocket.h"
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#include "Poco/Net/HTTPSession.h"
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#include "Poco/Buffer.h"
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#include "Poco/BinaryWriter.h"
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#include "Poco/BinaryReader.h"
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#include "Poco/MemoryStream.h"
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#include "Poco/Format.h"
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#include <limits>
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#include <cstring>
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namespace Poco {
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namespace Net {
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WebSocketImpl::WebSocketImpl(StreamSocketImpl* pStreamSocketImpl, HTTPSession& session, bool mustMaskPayload):
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StreamSocketImpl(pStreamSocketImpl->sockfd()),
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_pStreamSocketImpl(pStreamSocketImpl),
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_maxPayloadSize(std::numeric_limits<int>::max()),
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_buffer(0),
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_bufferOffset(0),
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_frameFlags(0),
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_mustMaskPayload(mustMaskPayload)
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{
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poco_check_ptr(pStreamSocketImpl);
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_pStreamSocketImpl->duplicate();
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session.drainBuffer(_buffer);
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}
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WebSocketImpl::~WebSocketImpl()
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{
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try
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{
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_pStreamSocketImpl->release();
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reset();
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}
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catch (...)
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{
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poco_unexpected();
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}
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}
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int WebSocketImpl::sendBytes(const void* buffer, int length, int flags)
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{
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Poco::Buffer<char> frame(length + MAX_HEADER_LENGTH);
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Poco::MemoryOutputStream ostr(frame.begin(), frame.size());
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Poco::BinaryWriter writer(ostr, Poco::BinaryWriter::NETWORK_BYTE_ORDER);
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if (flags == 0) flags = WebSocket::FRAME_BINARY;
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flags &= 0xff;
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writer << static_cast<Poco::UInt8>(flags);
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Poco::UInt8 lengthByte(0);
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if (_mustMaskPayload)
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{
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lengthByte |= FRAME_FLAG_MASK;
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}
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if (length < 126)
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{
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lengthByte |= static_cast<Poco::UInt8>(length);
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writer << lengthByte;
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}
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else if (length < 65536)
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{
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lengthByte |= 126;
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writer << lengthByte << static_cast<Poco::UInt16>(length);
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}
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else
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{
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lengthByte |= 127;
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writer << lengthByte << static_cast<Poco::UInt64>(length);
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}
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if (_mustMaskPayload)
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{
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const Poco::UInt32 mask = _rnd.next();
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const char* m = reinterpret_cast<const char*>(&mask);
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const char* b = reinterpret_cast<const char*>(buffer);
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writer.writeRaw(m, 4);
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char* p = frame.begin() + ostr.charsWritten();
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for (int i = 0; i < length; i++)
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{
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p[i] = b[i] ^ m[i % 4];
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}
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}
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else
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{
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std::memcpy(frame.begin() + ostr.charsWritten(), buffer, length);
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}
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_pStreamSocketImpl->sendBytes(frame.begin(), length + static_cast<int>(ostr.charsWritten()));
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return length;
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}
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int WebSocketImpl::receiveHeader(char mask[4], bool& useMask)
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{
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char header[MAX_HEADER_LENGTH];
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int n = receiveNBytes(header, 2);
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if (n <= 0)
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{
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_frameFlags = 0;
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return n;
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}
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poco_assert (n == 2);
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Poco::UInt8 flags = static_cast<Poco::UInt8>(header[0]);
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_frameFlags = flags;
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Poco::UInt8 lengthByte = static_cast<Poco::UInt8>(header[1]);
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useMask = ((lengthByte & FRAME_FLAG_MASK) != 0);
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int payloadLength;
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lengthByte &= 0x7f;
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if (lengthByte == 127)
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{
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n = receiveNBytes(header + 2, 8);
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if (n <= 0)
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{
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_frameFlags = 0;
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return n;
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}
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Poco::MemoryInputStream istr(header + 2, 8);
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Poco::BinaryReader reader(istr, Poco::BinaryReader::NETWORK_BYTE_ORDER);
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Poco::UInt64 l;
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reader >> l;
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if (l > _maxPayloadSize) throw WebSocketException("Payload too big", WebSocket::WS_ERR_PAYLOAD_TOO_BIG);
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payloadLength = static_cast<int>(l);
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}
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else if (lengthByte == 126)
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{
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n = receiveNBytes(header + 2, 2);
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if (n <= 0)
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{
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_frameFlags = 0;
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return n;
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}
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Poco::MemoryInputStream istr(header + 2, 2);
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Poco::BinaryReader reader(istr, Poco::BinaryReader::NETWORK_BYTE_ORDER);
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Poco::UInt16 l;
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reader >> l;
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if (l > _maxPayloadSize) throw WebSocketException("Payload too big", WebSocket::WS_ERR_PAYLOAD_TOO_BIG);
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payloadLength = static_cast<int>(l);
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}
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else
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{
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if (lengthByte > _maxPayloadSize) throw WebSocketException("Payload too big", WebSocket::WS_ERR_PAYLOAD_TOO_BIG);
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payloadLength = lengthByte;
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}
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if (useMask)
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{
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n = receiveNBytes(mask, 4);
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if (n <= 0)
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{
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_frameFlags = 0;
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return n;
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}
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}
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return payloadLength;
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}
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void WebSocketImpl::setMaxPayloadSize(int maxPayloadSize)
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{
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poco_assert (maxPayloadSize > 0);
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_maxPayloadSize = maxPayloadSize;
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}
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int WebSocketImpl::receivePayload(char *buffer, int payloadLength, char mask[4], bool useMask)
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{
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int received = receiveNBytes(reinterpret_cast<char*>(buffer), payloadLength);
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if (received <= 0) throw WebSocketException("Incomplete frame received", WebSocket::WS_ERR_INCOMPLETE_FRAME);
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if (useMask)
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{
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for (int i = 0; i < received; i++)
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{
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buffer[i] ^= mask[i % 4];
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}
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}
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return received;
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}
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int WebSocketImpl::receiveBytes(void* buffer, int length, int)
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{
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char mask[4];
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bool useMask;
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int payloadLength = receiveHeader(mask, useMask);
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if (payloadLength <= 0)
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return payloadLength;
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if (payloadLength > length)
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throw WebSocketException(Poco::format("Insufficient buffer for payload size %d", payloadLength), WebSocket::WS_ERR_PAYLOAD_TOO_BIG);
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return receivePayload(reinterpret_cast<char*>(buffer), payloadLength, mask, useMask);
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}
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int WebSocketImpl::receiveBytes(Poco::Buffer<char>& buffer, int, const Poco::Timespan&)
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{
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char mask[4];
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bool useMask;
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int payloadLength = receiveHeader(mask, useMask);
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if (payloadLength <= 0)
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return payloadLength;
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std::size_t oldSize = buffer.size();
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buffer.resize(oldSize + payloadLength);
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return receivePayload(buffer.begin() + oldSize, payloadLength, mask, useMask);
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}
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int WebSocketImpl::receiveNBytes(void* buffer, int bytes)
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{
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int received = receiveSomeBytes(reinterpret_cast<char*>(buffer), bytes);
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if (received > 0)
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{
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while (received < bytes)
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{
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int n = receiveSomeBytes(reinterpret_cast<char*>(buffer) + received, bytes - received);
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if (n > 0)
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received += n;
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else
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throw WebSocketException("Incomplete frame received", WebSocket::WS_ERR_INCOMPLETE_FRAME);
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}
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}
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return received;
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}
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int WebSocketImpl::receiveSomeBytes(char* buffer, int bytes)
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{
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int n = static_cast<int>(_buffer.size()) - _bufferOffset;
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if (n > 0)
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{
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if (bytes < n) n = bytes;
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std::memcpy(buffer, _buffer.begin() + _bufferOffset, n);
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_bufferOffset += n;
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return n;
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}
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else
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{
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return _pStreamSocketImpl->receiveBytes(buffer, bytes);
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}
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}
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SocketImpl* WebSocketImpl::acceptConnection(SocketAddress& clientAddr)
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{
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throw Poco::InvalidAccessException("Cannot acceptConnection() on a WebSocketImpl");
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}
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void WebSocketImpl::connect(const SocketAddress& address)
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{
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throw Poco::InvalidAccessException("Cannot connect() a WebSocketImpl");
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}
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void WebSocketImpl::connect(const SocketAddress& address, const Poco::Timespan& timeout)
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{
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throw Poco::InvalidAccessException("Cannot connect() a WebSocketImpl");
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}
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void WebSocketImpl::connectNB(const SocketAddress& address)
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{
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throw Poco::InvalidAccessException("Cannot connectNB() a WebSocketImpl");
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}
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void WebSocketImpl::bind(const SocketAddress& address, bool reuseAddress)
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{
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throw Poco::InvalidAccessException("Cannot bind() a WebSocketImpl");
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}
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void WebSocketImpl::bind(const SocketAddress& address, bool reuseAddress, bool reusePort)
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{
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throw Poco::InvalidAccessException("Cannot bind() a WebSocketImpl");
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}
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void WebSocketImpl::bind6(const SocketAddress& address, bool reuseAddress, bool ipV6Only)
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{
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throw Poco::InvalidAccessException("Cannot bind6() a WebSocketImpl");
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}
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void WebSocketImpl::bind6(const SocketAddress& address, bool reuseAddress, bool reusePort, bool ipV6Only)
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{
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throw Poco::InvalidAccessException("Cannot bind6() a WebSocketImpl");
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}
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void WebSocketImpl::listen(int backlog)
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{
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throw Poco::InvalidAccessException("Cannot listen() on a WebSocketImpl");
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}
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void WebSocketImpl::close()
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{
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_pStreamSocketImpl->close();
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reset();
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}
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void WebSocketImpl::shutdownReceive()
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{
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_pStreamSocketImpl->shutdownReceive();
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}
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void WebSocketImpl::shutdownSend()
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{
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_pStreamSocketImpl->shutdownSend();
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}
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void WebSocketImpl::shutdown()
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{
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_pStreamSocketImpl->shutdown();
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}
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int WebSocketImpl::sendTo(const void* buffer, int length, const SocketAddress& address, int flags)
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{
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throw Poco::InvalidAccessException("Cannot sendTo() on a WebSocketImpl");
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}
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int WebSocketImpl::receiveFrom(void* buffer, int length, SocketAddress& address, int flags)
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{
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throw Poco::InvalidAccessException("Cannot receiveFrom() on a WebSocketImpl");
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}
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void WebSocketImpl::sendUrgent(unsigned char data)
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{
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throw Poco::InvalidAccessException("Cannot sendUrgent() on a WebSocketImpl");
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}
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bool WebSocketImpl::secure() const
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{
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return _pStreamSocketImpl->secure();
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}
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void WebSocketImpl::setSendTimeout(const Poco::Timespan& timeout)
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{
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_pStreamSocketImpl->setSendTimeout(timeout);
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}
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Poco::Timespan WebSocketImpl::getSendTimeout()
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{
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return _pStreamSocketImpl->getSendTimeout();
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}
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void WebSocketImpl::setReceiveTimeout(const Poco::Timespan& timeout)
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{
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_pStreamSocketImpl->setReceiveTimeout(timeout);
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}
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Poco::Timespan WebSocketImpl::getReceiveTimeout()
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{
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return _pStreamSocketImpl->getReceiveTimeout();
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}
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int WebSocketImpl::available()
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{
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int n = static_cast<int>(_buffer.size()) - _bufferOffset;
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if (n > 0)
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return n + _pStreamSocketImpl->available();
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else
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return _pStreamSocketImpl->available();
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}
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} } // namespace Poco::Net
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