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#include <QtCore/QtEndian>
#include "saprotocol.h"
#include "wmspeer.h"
#include "crc16.h"
#include "sapsocket.h"
#include "sapbtpeer.h"
#define PROTO_DEBUG 1
SAPBTPeer::SAPBTPeer(SAProtocol::Role role, QBluetoothSocket *socket, QObject *parent) :
SAPPeer(role, socket->localAddress().toString(), socket->peerAddress().toString(), parent),
_socket(socket),
_curFrameLength(0),
_peerDescriptionExchangeDone(false), _authenticationDone(false)
{
connect(_socket, SIGNAL(readyRead()), SLOT(handleSocketData()));
connect(_socket, SIGNAL(disconnected()), SLOT(handleSocketDisconnected()));
}
void SAPBTPeer::handleSocketData()
{
uint bytes = _socket->bytesAvailable();
const bool need_crc = _peerDescriptionExchangeDone && _authenticationDone;
const uint header_size = need_crc ? 2 * sizeof(quint16) : 1 * sizeof(quint16);
const uint footer_size = need_crc ? sizeof(quint16) : 0;
while ((_curFrameLength == 0 && bytes >= header_size) ||
(_curFrameLength > 0 && bytes >= _curFrameLength + footer_size)) {
if (_curFrameLength > 0) {
QByteArray frame = _socket->read(_curFrameLength);
Q_ASSERT(frame.size() == (int)_curFrameLength);
_curFrameLength = 0;
if (need_crc) {
quint16 computed_crc = crc16(0, reinterpret_cast<const quint8*>(frame.constData()), frame.size());
quint16 crc;
_socket->read(reinterpret_cast<char*>(&crc), sizeof(quint16));
crc = qFromBigEndian(crc);
if (crc != computed_crc) {
qWarning() << "CRC data failure";
_socket->close(); // Drop the connection, no provision for resync.
return;
}
}
handleFrame(frame);
} else {
quint16 frame_length;
bytes = _socket->read(reinterpret_cast<char*>(&frame_length), sizeof(quint16));
Q_ASSERT(bytes == sizeof(quint16));
_curFrameLength = qFromBigEndian(frame_length);
Q_ASSERT(_curFrameLength > 0);
if (need_crc) {
// Compute the checksum of the BIG ENDIAN frame length.
quint16 computed_crc = crc16(0, reinterpret_cast<quint8*>(&frame_length), sizeof(quint16));
quint16 crc;
_socket->read(reinterpret_cast<char*>(&crc), sizeof(quint16));
crc = qFromBigEndian(crc);
if (crc != computed_crc) {
qWarning() << "CRC length failure";
_curFrameLength = 0;
_socket->close(); // Drop the connection, no provision for resync.
return;
}
}
}
bytes = _socket->bytesAvailable();
}
}
void SAPBTPeer::handleSocketDisconnected()
{
qDebug() << "Socket disconnected";
handleDisconnected();
}
void SAPBTPeer::sendFrame(const QByteArray &data)
{
const bool need_crc = _peerDescriptionExchangeDone && _authenticationDone;
quint16 frame_length = qToBigEndian<quint16>(data.length());
_socket->write(reinterpret_cast<const char*>(&frame_length), sizeof(quint16));
// Compute the checksum of the BIG ENDIAN frame length.
if (need_crc) {
quint16 crc = qToBigEndian(crc16(0, reinterpret_cast<quint8*>(&frame_length), sizeof(quint16)));
_socket->write(reinterpret_cast<const char*>(&crc), sizeof(quint16));
}
_socket->write(data.constData(), data.size());
if (need_crc) {
quint16 crc = qToBigEndian(crc16(0, reinterpret_cast<const quint8*>(data.constData()), data.size()));
_socket->write(reinterpret_cast<const char*>(&crc), sizeof(quint16));
}
#if PROTO_DEBUG
qDebug() << "Sent:" << data.toHex();
#endif
}
void SAPBTPeer::handleFrame(const QByteArray &data)
{
#if PROTO_DEBUG
qDebug() << "Recv:" << data.toHex();
#endif
if (!_peerDescriptionExchangeDone) {
// This must be a peer description frame!
SAProtocol::PeerDescription peerDesc = SAProtocol::unpackPeerDescription(data);
qDebug() << peerDesc.product << peerDesc.manufacturer << peerDesc.name;
SAProtocol::PeerDescription myDesc = peerDesc;
myDesc.messageType = 6; // Why?
myDesc.status = 0; // This seems to be "accepted"
myDesc.product = "RandomPhone";
myDesc.manufacturer = "me";
myDesc.name = "gearbttest";
myDesc.profile = "SWatch"; // This is what Gear manager sends
sendFrame(SAProtocol::packPeerDescription(myDesc));
_peerDescriptionExchangeDone = true;
} else if (!_authenticationDone) {
// This must be a authentication frame...
handleAuthenticationFrame(data);
} else {
SAProtocol::Frame frame = SAProtocol::unpackFrame(data);
switch (frame.type) {
case SAProtocol::FrameData:
handleDataFrame(frame);
break;
case SAProtocol::FrameControl:
qWarning() << "Got control frame, what to do?";
break;
default:
qWarning() << "Unknown frame type" << frame.type;
break;
}
}
}
void SAPBTPeer::handleDataFrame(const SAProtocol::Frame &frame)
{
Q_ASSERT(frame.type == SAProtocol::FrameData);
handleSessionData(frame.sessionId, frame.data);
}
void SAPBTPeer::handleAuthenticationFrame(const QByteArray &data)
{
SAProtocol::SecurityFrame sframe = SAProtocol::unpackSecurityFrame(data);
switch (sframe.type) {
case SAProtocol::SecurityAuthenticateRequest: {
qDebug() << "Starting authorization...";
SAProtocol::SecurityFrame response = _wms->respondToServerChallenge(sframe);
if (!response.data.isEmpty()) {
sendFrame(SAProtocol::packSecurityFrame(response));
}
break;
}
case SAProtocol::SecurityAuthenticateConfirm: {
_authenticationDone = _wms->verifyServerResponse(sframe);
if (_authenticationDone) {
qDebug() << "Authentication confirmed";
handleConnected();
} else {
qWarning() << "Authentication failure, closing connection";
_socket->close(); // Will call "handleDisconnected" and emit disconnected signals.
}
break;
}
default:
qWarning() << "Unknown security frame type" << sframe.type;
break;
}
}
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