qint64 LimitedNodeList::writeUnverifiedDatagram(const QByteArray& datagram, const SharedNodePointer& destinationNode,
const HifiSockAddr& overridenSockAddr) {
if (destinationNode) {
// if we don't have an ovveriden address, assume they want to send to the node's active socket
const HifiSockAddr* destinationSockAddr = &overridenSockAddr;
if (overridenSockAddr.isNull()) {
if (destinationNode->getActiveSocket()) {
// use the node's active socket as the destination socket
destinationSockAddr = destinationNode->getActiveSocket();
} else {
// we don't have a socket to send to, return 0
return 0;
}
}
PacketType packetType = packetTypeForPacket(datagram);
// optionally peform sequence number replacement in the header
if (SEQUENCE_NUMBERED_PACKETS.contains(packetType)) {
QByteArray datagramCopy = datagram;
PacketSequenceNumber sequenceNumber = getNextSequenceNumberForPacket(destinationNode->getUUID(), packetType);
replaceSequenceNumberInPacket(datagramCopy, sequenceNumber, packetType);
// send the datagram with sequence number replaced in header
return writeDatagram(datagramCopy, *destinationSockAddr);
} else {
return writeDatagram(datagram, *destinationSockAddr);
}
}
// didn't have a destinationNode to send to, return 0
return 0;
}
qint64 LimitedNodeList::writeDatagram(const QByteArray& datagram,
const SharedNodePointer& destinationNode,
const HifiSockAddr& overridenSockAddr) {
if (destinationNode) {
PacketType packetType = packetTypeForPacket(datagram);
if (NON_VERIFIED_PACKETS.contains(packetType)) {
return writeUnverifiedDatagram(datagram, destinationNode, overridenSockAddr);
}
// if we don't have an overridden address, assume they want to send to the node's active socket
const HifiSockAddr* destinationSockAddr = &overridenSockAddr;
if (overridenSockAddr.isNull()) {
if (destinationNode->getActiveSocket()) {
// use the node's active socket as the destination socket
destinationSockAddr = destinationNode->getActiveSocket();
} else {
// we don't have a socket to send to, return 0
return 0;
}
}
QByteArray datagramCopy = datagram;
// if we're here and the connection secret is null, debug out - this could be a problem
if (destinationNode->getConnectionSecret().isNull()) {
qDebug() << "LimitedNodeList::writeDatagram called for verified datagram with null connection secret for"
<< "destination node" << destinationNode->getUUID() << " - this is either not secure or will cause"
<< "this packet to be unverifiable on the receiving side.";
}
// perform replacement of hash and optionally also sequence number in the header
if (SEQUENCE_NUMBERED_PACKETS.contains(packetType)) {
PacketSequenceNumber sequenceNumber = getNextSequenceNumberForPacket(destinationNode->getUUID(), packetType);
replaceHashAndSequenceNumberInPacket(datagramCopy, destinationNode->getConnectionSecret(),
sequenceNumber, packetType);
} else {
replaceHashInPacket(datagramCopy, destinationNode->getConnectionSecret(), packetType);
}
emit dataSent(destinationNode->getType(), datagram.size());
auto bytesWritten = writeDatagram(datagramCopy, *destinationSockAddr);
// Keep track of per-destination-node bandwidth
destinationNode->recordBytesSent(bytesWritten);
return bytesWritten;
}
// didn't have a destinationNode to send to, return 0
return 0;
}
qint64 LimitedNodeList::writePacket(const NLPacket& packet, const Node& destinationNode) {
if (!destinationNode.getActiveSocket()) {
return 0;
}
// TODO Move to transport layer when ready
if (SEQUENCE_NUMBERED_PACKETS.contains(packet.getType())) {
PacketSequenceNumber sequenceNumber = getNextSequenceNumberForPacket(destinationNode.getUUID(), packet.getType());
const_cast<NLPacket&>(packet).writeSequenceNumber(sequenceNumber);
}
emit dataSent(destinationNode.getType(), packet.getDataSize());
return writePacket(packet, *destinationNode.getActiveSocket(), destinationNode.getConnectionSecret());
}
