ErrorCode LTSendBuffer::Frame::PrepareForSending(LTSendBuffer & sendBuffer)
{
Invariant(!preparedForSending_);
preparedForSending_ = true;
ErrorCode error = EncryptIfNeeded(sendBuffer);
if (!error.IsSuccess())
{
return error;
}
if (!encrypted_.empty())
{
Invariant(shouldEncrypt_);
sendBuffer.preparedBuffers_.emplace_back(ConstBuffer(encrypted_.data(), encrypted_.size()));
sendBuffer.sendingLength_ += encrypted_.size();
return error;
}
// add frame header
if (message_->Actor != Actor::SecurityContext)
{
sendBuffer.preparedBuffers_.emplace_back(ConstBuffer(&header_, sizeof(header_)));
sendBuffer.sendingLength_ += sizeof(header_);
}
// add message body
for (BufferIterator chunk = message_->BeginBodyChunks(); chunk != message_->EndBodyChunks(); ++chunk)
{
if (chunk->size() == 0) continue;
sendBuffer.preparedBuffers_.emplace_back(ConstBuffer(chunk->cbegin(), chunk->size()));
sendBuffer.sendingLength_ += chunk->size();
}
return error;
}
ErrorCode LTSendBuffer::Frame::EncryptIfNeeded(LTSendBuffer & sendBuffer)
{
if (!shouldEncrypt_)
{
return ErrorCode();
}
#ifdef PLATFORM_UNIX
auto securityContext = sendBuffer.connection_->securityContext_.get();
Invariant(securityContext->TransportSecurity().SecurityProvider == SecurityProvider::Ssl);
auto securityContextSsl = (SecurityContextSsl*)securityContext;
//LINUXTODO avoid data copying during encryption
auto reserveSize = sizeof(header_) + message_->SerializedBodySize();
ByteBuffer2 buffer(reserveSize);
TcpConnection::WriteNoise(
TraceType, sendBuffer.connection_->TraceId(),
"Encrypt: {0}, plaintext length (including frame header) = {1}",
message_->TraceId(), buffer.size());
buffer.append(&header_, sizeof(header_));
for (BufferIterator chunk = message_->BeginBodyChunks(); chunk != message_->EndBodyChunks(); ++chunk)
{
buffer.append(chunk->cbegin(), chunk->size());
}
Invariant(buffer.size() == reserveSize);
auto error = securityContextSsl->Encrypt(buffer.data(), buffer.size());
if (!error.IsSuccess()) return error;
encrypted_ = securityContextSsl->EncryptFinal();
// adjust for size change due to encryption
auto bufferedBefore = sendBuffer.totalBufferedBytes_;
sendBuffer.totalBufferedBytes_ -= buffer.size();
sendBuffer.totalBufferedBytes_ += encrypted_.size();
TcpConnection::WriteNoise(
TraceType, sendBuffer.connection_->TraceId(),
"Encrypt: plain = {0}, encrypted = {1}, totalBufferedBytes_: before = {2}, after = {3}",
buffer.size(), encrypted_.size(), bufferedBefore, sendBuffer.totalBufferedBytes_);
return error;
#else
sendBuffer;
Assert::CodingError("not implemented");
#endif
}