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components/openthread/openthread/src/core/coap/coap_secure.cpp
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/*
* Copyright (c) 2016, The OpenThread Authors.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "coap_secure.hpp"
#if OPENTHREAD_CONFIG_SECURE_TRANSPORT_ENABLE
#include "instance/instance.hpp"
/**
* @file
* This file implements the secure CoAP agent.
*/
namespace ot {
namespace Coap {
RegisterLogModule("CoapSecure");
CoapSecure::CoapSecure(Instance &aInstance, bool aLayerTwoSecurity)
: CoapBase(aInstance, &CoapSecure::Send)
, mDtls(aInstance, aLayerTwoSecurity)
, mTransmitTask(aInstance, CoapSecure::HandleTransmit, this)
{
}
Error CoapSecure::Start(uint16_t aPort) { return Start(aPort, /* aMaxAttempts */ 0, nullptr, nullptr); }
Error CoapSecure::Start(uint16_t aPort, uint16_t aMaxAttempts, AutoStopCallback aCallback, void *aContext)
{
Error error;
SuccessOrExit(error = Open(aMaxAttempts, aCallback, aContext));
error = mDtls.Bind(aPort);
exit:
return error;
}
Error CoapSecure::Start(MeshCoP::SecureTransport::TransportCallback aCallback, void *aContext)
{
Error error;
SuccessOrExit(error = Open(/* aMaxAttemps */ 0, nullptr, nullptr));
error = mDtls.Bind(aCallback, aContext);
exit:
return error;
}
Error CoapSecure::Open(uint16_t aMaxAttempts, AutoStopCallback aCallback, void *aContext)
{
Error error = kErrorAlready;
SuccessOrExit(mDtls.SetMaxConnectionAttempts(aMaxAttempts, HandleDtlsAutoClose, this));
mAutoStopCallback.Set(aCallback, aContext);
mConnectEventCallback.Clear();
SuccessOrExit(mDtls.Open(HandleDtlsReceive, HandleDtlsConnectEvent, this));
error = kErrorNone;
exit:
return error;
}
void CoapSecure::Stop(void)
{
mDtls.Close();
mTransmitQueue.DequeueAndFreeAll();
ClearRequestsAndResponses();
}
Error CoapSecure::Connect(const Ip6::SockAddr &aSockAddr, ConnectEventCallback aCallback, void *aContext)
{
mConnectEventCallback.Set(aCallback, aContext);
return mDtls.Connect(aSockAddr);
}
void CoapSecure::SetPsk(const MeshCoP::JoinerPskd &aPskd)
{
static_assert(static_cast<uint16_t>(MeshCoP::JoinerPskd::kMaxLength) <=
static_cast<uint16_t>(MeshCoP::SecureTransport::kPskMaxLength),
"The maximum length of DTLS PSK is smaller than joiner PSKd");
SuccessOrAssert(mDtls.SetPsk(reinterpret_cast<const uint8_t *>(aPskd.GetAsCString()), aPskd.GetLength()));
}
#if OPENTHREAD_CONFIG_COAP_BLOCKWISE_TRANSFER_ENABLE
Error CoapSecure::SendMessage(Message &aMessage,
ResponseHandler aHandler,
void *aContext,
otCoapBlockwiseTransmitHook aTransmitHook,
otCoapBlockwiseReceiveHook aReceiveHook)
{
Error error = kErrorNone;
VerifyOrExit(IsConnected(), error = kErrorInvalidState);
error = CoapBase::SendMessage(aMessage, mDtls.GetMessageInfo(), TxParameters::GetDefault(), aHandler, aContext,
aTransmitHook, aReceiveHook);
exit:
return error;
}
Error CoapSecure::SendMessage(Message &aMessage,
const Ip6::MessageInfo &aMessageInfo,
ResponseHandler aHandler,
void *aContext,
otCoapBlockwiseTransmitHook aTransmitHook,
otCoapBlockwiseReceiveHook aReceiveHook)
{
return CoapBase::SendMessage(aMessage, aMessageInfo, TxParameters::GetDefault(), aHandler, aContext, aTransmitHook,
aReceiveHook);
}
#else // OPENTHREAD_CONFIG_COAP_BLOCKWISE_TRANSFER_ENABLE
Error CoapSecure::SendMessage(Message &aMessage, ResponseHandler aHandler, void *aContext)
{
Error error = kErrorNone;
VerifyOrExit(IsConnected(), error = kErrorInvalidState);
error = CoapBase::SendMessage(aMessage, mDtls.GetMessageInfo(), aHandler, aContext);
exit:
return error;
}
Error CoapSecure::SendMessage(Message &aMessage,
const Ip6::MessageInfo &aMessageInfo,
ResponseHandler aHandler,
void *aContext)
{
return CoapBase::SendMessage(aMessage, aMessageInfo, aHandler, aContext);
}
#endif // OPENTHREAD_CONFIG_COAP_BLOCKWISE_TRANSFER_ENABLE
Error CoapSecure::Send(ot::Message &aMessage, const Ip6::MessageInfo &aMessageInfo)
{
OT_UNUSED_VARIABLE(aMessageInfo);
mTransmitQueue.Enqueue(aMessage);
mTransmitTask.Post();
return kErrorNone;
}
void CoapSecure::HandleDtlsConnectEvent(MeshCoP::SecureTransport::ConnectEvent aEvent, void *aContext)
{
return static_cast<CoapSecure *>(aContext)->HandleDtlsConnectEvent(aEvent);
}
void CoapSecure::HandleDtlsConnectEvent(MeshCoP::SecureTransport::ConnectEvent aEvent)
{
mConnectEventCallback.InvokeIfSet(aEvent);
}
void CoapSecure::HandleDtlsAutoClose(void *aContext)
{
return static_cast<CoapSecure *>(aContext)->HandleDtlsAutoClose();
}
void CoapSecure::HandleDtlsAutoClose(void)
{
Stop();
mAutoStopCallback.InvokeIfSet();
}
void CoapSecure::HandleDtlsReceive(void *aContext, uint8_t *aBuf, uint16_t aLength)
{
return static_cast<CoapSecure *>(aContext)->HandleDtlsReceive(aBuf, aLength);
}
void CoapSecure::HandleDtlsReceive(uint8_t *aBuf, uint16_t aLength)
{
ot::Message *message = nullptr;
VerifyOrExit((message = Get<MessagePool>().Allocate(Message::kTypeIp6, Message::GetHelpDataReserved())) != nullptr);
SuccessOrExit(message->AppendBytes(aBuf, aLength));
CoapBase::Receive(*message, mDtls.GetMessageInfo());
exit:
FreeMessage(message);
}
void CoapSecure::HandleTransmit(Tasklet &aTasklet)
{
static_cast<CoapSecure *>(static_cast<TaskletContext &>(aTasklet).GetContext())->HandleTransmit();
}
void CoapSecure::HandleTransmit(void)
{
Error error = kErrorNone;
ot::Message *message = mTransmitQueue.GetHead();
VerifyOrExit(message != nullptr);
mTransmitQueue.Dequeue(*message);
if (mTransmitQueue.GetHead() != nullptr)
{
mTransmitTask.Post();
}
SuccessOrExit(error = mDtls.Send(*message, message->GetLength()));
exit:
if (error != kErrorNone)
{
LogNote("Transmit: %s", ErrorToString(error));
message->Free();
}
else
{
LogDebg("Transmit: %s", ErrorToString(error));
}
}
} // namespace Coap
} // namespace ot
#endif // OPENTHREAD_CONFIG_SECURE_TRANSPORT_ENABLE
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