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/*
*
* Copyright (c) 2021 Project CHIP Authors
* All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @file
* Implementation of SetUp Code Pairer, a class that parses a given
* setup code and uses the extracted informations to discover and
* filter commissionables nodes, before initiating the pairing process.
*
*/
#include <controller/SetUpCodePairer.h>
#include <controller/CHIPDeviceController.h>
#include <lib/dnssd/Resolver.h>
#include <lib/support/CodeUtils.h>
#include <system/SystemClock.h>
constexpr uint32_t kDeviceDiscoveredTimeout = CHIP_CONFIG_SETUP_CODE_PAIRER_DISCOVERY_TIMEOUT_SECS * chip::kMillisecondsPerSecond;
namespace chip {
namespace Controller {
CHIP_ERROR SetUpCodePairer::PairDevice(NodeId remoteId, const char * setUpCode, SetupCodePairerBehaviour commission)
{
VerifyOrReturnError(mSystemLayer != nullptr, CHIP_ERROR_INCORRECT_STATE);
SetupPayload payload;
mConnectionType = commission;
bool isQRCode = strncmp(setUpCode, kQRCodePrefix, strlen(kQRCodePrefix)) == 0;
if (isQRCode)
{
ReturnErrorOnFailure(QRCodeSetupPayloadParser(setUpCode).populatePayload(payload));
VerifyOrReturnError(payload.isValidQRCodePayload(), CHIP_ERROR_INVALID_ARGUMENT);
}
else
{
ReturnErrorOnFailure(ManualSetupPayloadParser(setUpCode).populatePayload(payload));
VerifyOrReturnError(payload.isValidManualCode(), CHIP_ERROR_INVALID_ARGUMENT);
}
mRemoteId = remoteId;
mSetUpPINCode = payload.setUpPINCode;
ResetDiscoveryState();
ReturnErrorOnFailure(Connect(payload));
return mSystemLayer->StartTimer(System::Clock::Milliseconds32(kDeviceDiscoveredTimeout), OnDeviceDiscoveredTimeoutCallback,
this);
}
CHIP_ERROR SetUpCodePairer::Connect(SetupPayload & payload)
{
CHIP_ERROR err = CHIP_NO_ERROR;
bool isRunning = false;
bool searchOverAll = !payload.rendezvousInformation.HasValue();
if (searchOverAll || payload.rendezvousInformation.Value().Has(RendezvousInformationFlag::kBLE))
{
if (CHIP_NO_ERROR == (err = StartDiscoverOverBle(payload)))
{
isRunning = true;
}
VerifyOrReturnError(searchOverAll || CHIP_NO_ERROR == err || CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE == err, err);
}
if (searchOverAll || payload.rendezvousInformation.Value().Has(RendezvousInformationFlag::kSoftAP))
{
if (CHIP_NO_ERROR == (err = StartDiscoverOverSoftAP(payload)))
{
isRunning = true;
}
VerifyOrReturnError(searchOverAll || CHIP_NO_ERROR == err || CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE == err, err);
}
// We always want to search on network because any node that has already been commissioned will use on-network regardless of the
// QR code flag.
if (CHIP_NO_ERROR == (err = StartDiscoverOverIP(payload)))
{
isRunning = true;
}
VerifyOrReturnError(searchOverAll || CHIP_NO_ERROR == err, err);
return isRunning ? CHIP_NO_ERROR : CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}
CHIP_ERROR SetUpCodePairer::StartDiscoverOverBle(SetupPayload & payload)
{
#if CONFIG_NETWORK_LAYER_BLE
#if CHIP_DEVICE_CONFIG_ENABLE_BOTH_COMMISSIONER_AND_COMMISSIONEE
VerifyOrReturnError(mCommissioner != nullptr, CHIP_ERROR_INCORRECT_STATE);
mCommissioner->ConnectBleTransportToSelf();
#endif // CHIP_DEVICE_CONFIG_ENABLE_BOTH_COMMISSIONER_AND_COMMISSIONEE
VerifyOrReturnError(mBleLayer != nullptr, CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE);
ChipLogProgress(Controller, "Starting commissioning discovery over BLE");
// Handle possibly-sync callbacks.
mWaitingForDiscovery[kBLETransport] = true;
CHIP_ERROR err = mBleLayer->NewBleConnectionByDiscriminator(payload.discriminator, this, OnDiscoveredDeviceOverBleSuccess,
OnDiscoveredDeviceOverBleError);
if (err != CHIP_NO_ERROR)
{
mWaitingForDiscovery[kBLETransport] = false;
}
return err;
#else
return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
#endif // CONFIG_NETWORK_LAYER_BLE
}
CHIP_ERROR SetUpCodePairer::StopConnectOverBle()
{
// Make sure to not call CancelBleIncompleteConnection unless we are in fact
// waiting on BLE discovery. It will cancel connections that are in fact
// completed. In particular, if we just established PASE over BLE calling
// CancelBleIncompleteConnection here unconditionally would cancel the BLE
// connection underlying the PASE session. So make sure to only call
// CancelBleIncompleteConnection if we're still waiting to hear back on the
// BLE discovery bits.
if (!mWaitingForDiscovery[kBLETransport])
{
return CHIP_NO_ERROR;
}
mWaitingForDiscovery[kBLETransport] = false;
#if CONFIG_NETWORK_LAYER_BLE
VerifyOrReturnError(mBleLayer != nullptr, CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE);
ChipLogDetail(Controller, "Stopping commissioning discovery over BLE");
return mBleLayer->CancelBleIncompleteConnection();
#else
return CHIP_NO_ERROR;
#endif // CONFIG_NETWORK_LAYER_BLE
}
CHIP_ERROR SetUpCodePairer::StartDiscoverOverIP(SetupPayload & payload)
{
ChipLogProgress(Controller, "Starting commissioning discovery over DNS-SD");
auto & discriminator = payload.discriminator;
if (discriminator.IsShortDiscriminator())
{
currentFilter.type = Dnssd::DiscoveryFilterType::kShortDiscriminator;
currentFilter.code = discriminator.GetShortValue();
}
else
{
currentFilter.type = Dnssd::DiscoveryFilterType::kLongDiscriminator;
currentFilter.code = discriminator.GetLongValue();
}
// Handle possibly-sync callbacks.
mWaitingForDiscovery[kIPTransport] = true;
CHIP_ERROR err = mCommissioner->DiscoverCommissionableNodes(currentFilter);
if (err != CHIP_NO_ERROR)
{
mWaitingForDiscovery[kIPTransport] = false;
}
return err;
}
CHIP_ERROR SetUpCodePairer::StopConnectOverIP()
{
ChipLogDetail(Controller, "Stopping commissioning discovery over DNS-SD");
mWaitingForDiscovery[kIPTransport] = false;
currentFilter.type = Dnssd::DiscoveryFilterType::kNone;
return CHIP_NO_ERROR;
}
CHIP_ERROR SetUpCodePairer::StartDiscoverOverSoftAP(SetupPayload & payload)
{
return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}
CHIP_ERROR SetUpCodePairer::StopConnectOverSoftAP()
{
mWaitingForDiscovery[kSoftAPTransport] = false;
return CHIP_NO_ERROR;
}
bool SetUpCodePairer::ConnectToDiscoveredDevice()
{
if (mWaitingForPASE)
{
// Nothing to do. Just wait until we either succeed or fail at that
// PASE session establishment.
return false;
}
if (!mDiscoveredParameters.empty())
{
// Grab the first element from the queue and try connecting to it.
// Remove it from the queue before we try to connect, in case the
// connection attempt fails and calls right back into us to try the next
// thing.
RendezvousParameters params(mDiscoveredParameters.front());
mDiscoveredParameters.pop();
params.SetSetupPINCode(mSetUpPINCode);
#if CHIP_PROGRESS_LOGGING
char buf[Transport::PeerAddress::kMaxToStringSize];
params.GetPeerAddress().ToString(buf);
ChipLogProgress(Controller, "Attempting PASE connection to %s", buf);
#endif // CHIP_PROGRESS_LOGGING
// Handle possibly-sync call backs from attempts to establish PASE.
ExpectPASEEstablishment();
CHIP_ERROR err;
if (mConnectionType == SetupCodePairerBehaviour::kCommission)
{
err = mCommissioner->PairDevice(mRemoteId, params);
}
else
{
err = mCommissioner->EstablishPASEConnection(mRemoteId, params);
}
LogErrorOnFailure(err);
if (err == CHIP_NO_ERROR)
{
return true;
}
// Failed to start establishing PASE.
PASEEstablishmentComplete();
}
return false;
}
#if CONFIG_NETWORK_LAYER_BLE
void SetUpCodePairer::OnDiscoveredDeviceOverBle(BLE_CONNECTION_OBJECT connObj)
{
ChipLogProgress(Controller, "Discovered device to be commissioned over BLE");
mWaitingForDiscovery[kBLETransport] = false;
Transport::PeerAddress peerAddress = Transport::PeerAddress::BLE();
mDiscoveredParameters.emplace();
mDiscoveredParameters.back().SetPeerAddress(peerAddress).SetConnectionObject(connObj);
ConnectToDiscoveredDevice();
}
void SetUpCodePairer::OnDiscoveredDeviceOverBleSuccess(void * appState, BLE_CONNECTION_OBJECT connObj)
{
(static_cast<SetUpCodePairer *>(appState))->OnDiscoveredDeviceOverBle(connObj);
}
void SetUpCodePairer::OnDiscoveredDeviceOverBleError(void * appState, CHIP_ERROR err)
{
static_cast<SetUpCodePairer *>(appState)->OnBLEDiscoveryError(err);
}
void SetUpCodePairer::OnBLEDiscoveryError(CHIP_ERROR err)
{
ChipLogError(Controller, "Commissioning discovery over BLE failed: %" CHIP_ERROR_FORMAT, err.Format());
mWaitingForDiscovery[kBLETransport] = false;
LogErrorOnFailure(err);
}
#endif // CONFIG_NETWORK_LAYER_BLE
bool SetUpCodePairer::NodeMatchesCurrentFilter(const Dnssd::DiscoveredNodeData & nodeData) const
{
if (nodeData.commissionData.commissioningMode == 0)
{
return false;
}
switch (currentFilter.type)
{
case Dnssd::DiscoveryFilterType::kShortDiscriminator:
return ((nodeData.commissionData.longDiscriminator >> 8) & 0x0F) == currentFilter.code;
case Dnssd::DiscoveryFilterType::kLongDiscriminator:
return nodeData.commissionData.longDiscriminator == currentFilter.code;
default:
return false;
}
return false;
}
void SetUpCodePairer::NotifyCommissionableDeviceDiscovered(const Dnssd::DiscoveredNodeData & nodeData)
{
if (!NodeMatchesCurrentFilter(nodeData))
{
return;
}
ChipLogProgress(Controller, "Discovered device to be commissioned over DNS-SD");
Inet::InterfaceId interfaceId =
nodeData.resolutionData.ipAddress[0].IsIPv6LinkLocal() ? nodeData.resolutionData.interfaceId : Inet::InterfaceId::Null();
Transport::PeerAddress peerAddress =
Transport::PeerAddress::UDP(nodeData.resolutionData.ipAddress[0], nodeData.resolutionData.port, interfaceId);
mDiscoveredParameters.emplace();
mDiscoveredParameters.back().SetPeerAddress(peerAddress);
ConnectToDiscoveredDevice();
}
void SetUpCodePairer::CommissionerShuttingDown()
{
ResetDiscoveryState();
}
bool SetUpCodePairer::TryNextRendezvousParameters()
{
if (ConnectToDiscoveredDevice())
{
ChipLogProgress(Controller, "Trying connection to commissionee over different transport");
return true;
}
if (DiscoveryInProgress())
{
ChipLogProgress(Controller, "Waiting to discover commissionees that match our filters");
return true;
}
return false;
}
bool SetUpCodePairer::DiscoveryInProgress() const
{
for (const auto & waiting : mWaitingForDiscovery)
{
if (waiting)
{
return true;
}
}
return false;
}
void SetUpCodePairer::ResetDiscoveryState()
{
StopConnectOverBle();
StopConnectOverIP();
StopConnectOverSoftAP();
// Just in case any of those failed to reset the waiting state properly.
for (auto & waiting : mWaitingForDiscovery)
{
waiting = false;
}
while (!mDiscoveredParameters.empty())
{
mDiscoveredParameters.pop();
}
mLastPASEError = CHIP_NO_ERROR;
}
void SetUpCodePairer::ExpectPASEEstablishment()
{
mWaitingForPASE = true;
auto * delegate = mCommissioner->GetPairingDelegate();
if (this == delegate)
{
// This should really not happen, but if it does, do nothing, to avoid
// delegate loops.
return;
}
mPairingDelegate = delegate;
mCommissioner->RegisterPairingDelegate(this);
}
void SetUpCodePairer::PASEEstablishmentComplete()
{
mWaitingForPASE = false;
mCommissioner->RegisterPairingDelegate(mPairingDelegate);
mPairingDelegate = nullptr;
}
void SetUpCodePairer::OnStatusUpdate(DevicePairingDelegate::Status status)
{
if (status == DevicePairingDelegate::Status::SecurePairingFailed)
{
// If we're still waiting on discovery, don't propagate this failure
// (which is due to PASE failure with something we discovered, but the
// "something" may not have been the right thing) for now. Wait until
// discovery completes. Then we will either succeed and notify
// accordingly or time out and land in OnStatusUpdate again, but at that
// point we will not be waiting on discovery anymore.
if (!mDiscoveredParameters.empty())
{
ChipLogProgress(Controller, "Ignoring SecurePairingFailed status for now; we have more discovered devices to try");
status = DevicePairingDelegate::Status::SecurePairingDiscoveringMoreDevices;
}
if (DiscoveryInProgress())
{
ChipLogProgress(Controller,
"Ignoring SecurePairingFailed status for now; we are waiting to see if we discover more devices");
status = DevicePairingDelegate::Status::SecurePairingDiscoveringMoreDevices;
}
}
if (mPairingDelegate)
{
mPairingDelegate->OnStatusUpdate(status);
}
}
void SetUpCodePairer::OnPairingComplete(CHIP_ERROR error)
{
// Save the pairing delegate so we can notify it. We want to notify it
// _after_ we restore the state on the commissioner, in case the delegate
// ends up immediately calling back into the commissioner again when
// notified.
auto * pairingDelegate = mPairingDelegate;
PASEEstablishmentComplete();
if (CHIP_NO_ERROR == error)
{
mSystemLayer->CancelTimer(OnDeviceDiscoveredTimeoutCallback, this);
ResetDiscoveryState();
if (pairingDelegate != nullptr)
{
pairingDelegate->OnPairingComplete(error);
}
return;
}
// We failed to establish PASE. Try the next thing we have discovered, if
// any.
if (TryNextRendezvousParameters())
{
// Keep waiting until that finishes. Don't call OnPairingComplete yet.
mLastPASEError = error;
return;
}
if (pairingDelegate != nullptr)
{
pairingDelegate->OnPairingComplete(error);
}
}
void SetUpCodePairer::OnPairingDeleted(CHIP_ERROR error)
{
if (mPairingDelegate)
{
mPairingDelegate->OnPairingDeleted(error);
}
}
void SetUpCodePairer::OnCommissioningComplete(NodeId deviceId, CHIP_ERROR error)
{
// Not really expecting this, but handle it anyway.
if (mPairingDelegate)
{
mPairingDelegate->OnCommissioningComplete(deviceId, error);
}
}
void SetUpCodePairer::OnDeviceDiscoveredTimeoutCallback(System::Layer * layer, void * context)
{
ChipLogError(Controller, "Discovery timed out");
auto * pairer = static_cast<SetUpCodePairer *>(context);
LogErrorOnFailure(pairer->StopConnectOverBle());
LogErrorOnFailure(pairer->StopConnectOverIP());
LogErrorOnFailure(pairer->StopConnectOverSoftAP());
if (!pairer->mWaitingForPASE && pairer->mDiscoveredParameters.empty())
{
// We're not waiting on any more PASE attempts, and we're not going to
// discover anything at this point, so we should just notify our
// listener.
CHIP_ERROR err = pairer->mLastPASEError;
if (err == CHIP_NO_ERROR)
{
err = CHIP_ERROR_TIMEOUT;
}
pairer->mCommissioner->OnSessionEstablishmentError(err);
}
}
} // namespace Controller
} // namespace chip