C++ Message::Append方法代码示例

otError AnnounceBeginClient::SendRequest(uint32_t aChannelMask, uint8_t aCount, uint16_t aPeriod,
                                         const Ip6::Address &aAddress)
{
    otError error = OT_ERROR_NONE;
    Coap::Header header;
    MeshCoP::CommissionerSessionIdTlv sessionId;
    MeshCoP::ChannelMask0Tlv channelMask;
    MeshCoP::CountTlv count;
    MeshCoP::PeriodTlv period;

    Ip6::MessageInfo messageInfo;
    Message *message = NULL;

    VerifyOrExit(GetNetif().GetCommissioner().IsActive(), error = OT_ERROR_INVALID_STATE);

    header.Init(aAddress.IsMulticast() ? OT_COAP_TYPE_NON_CONFIRMABLE : OT_COAP_TYPE_CONFIRMABLE,
                OT_COAP_CODE_POST);
    header.SetToken(Coap::Header::kDefaultTokenLength);
    header.AppendUriPathOptions(OT_URI_PATH_ANNOUNCE_BEGIN);
    header.SetPayloadMarker();

    VerifyOrExit((message = MeshCoP::NewMeshCoPMessage(GetNetif().GetCoap(), header)) != NULL,
                 error = OT_ERROR_NO_BUFS);

    sessionId.Init();
    sessionId.SetCommissionerSessionId(GetNetif().GetCommissioner().GetSessionId());
    SuccessOrExit(error = message->Append(&sessionId, sizeof(sessionId)));

    channelMask.Init();
    channelMask.SetMask(aChannelMask);
    SuccessOrExit(error = message->Append(&channelMask, sizeof(channelMask)));

    count.Init();
    count.SetCount(aCount);
    SuccessOrExit(error = message->Append(&count, sizeof(count)));

    period.Init();
    period.SetPeriod(aPeriod);
    SuccessOrExit(error = message->Append(&period, sizeof(period)));

    messageInfo.SetSockAddr(GetNetif().GetMle().GetMeshLocal16());
    messageInfo.SetPeerAddr(aAddress);
    messageInfo.SetPeerPort(kCoapUdpPort);
    messageInfo.SetInterfaceId(GetNetif().GetInterfaceId());

    SuccessOrExit(error = GetNetif().GetCoap().SendMessage(*message, messageInfo));

    otLogInfoMeshCoP(GetInstance(), "sent announce begin query");

exit:

    if (error != OT_ERROR_NONE && message != NULL)
    {
        message->Free();
    }

    return error;
}

otError PanIdQueryClient::SendQuery(uint16_t aPanId, uint32_t aChannelMask, const Ip6::Address &aAddress,
                                    otCommissionerPanIdConflictCallback aCallback, void *aContext)
{
    ThreadNetif &netif = GetNetif();
    otError error = OT_ERROR_NONE;
    Coap::Header header;
    MeshCoP::CommissionerSessionIdTlv sessionId;
    MeshCoP::ChannelMask0Tlv channelMask;
    MeshCoP::PanIdTlv panId;
    Ip6::MessageInfo messageInfo;
    Message *message = NULL;

    VerifyOrExit(netif.GetCommissioner().IsActive(), error = OT_ERROR_INVALID_STATE);

    header.Init(aAddress.IsMulticast() ? OT_COAP_TYPE_NON_CONFIRMABLE : OT_COAP_TYPE_CONFIRMABLE,
                OT_COAP_CODE_POST);
    header.SetToken(Coap::Header::kDefaultTokenLength);
    header.AppendUriPathOptions(OT_URI_PATH_PANID_QUERY);
    header.SetPayloadMarker();

    VerifyOrExit((message = MeshCoP::NewMeshCoPMessage(netif.GetCoap(), header)) != NULL,
                 error = OT_ERROR_NO_BUFS);

    sessionId.Init();
    sessionId.SetCommissionerSessionId(netif.GetCommissioner().GetSessionId());
    SuccessOrExit(error = message->Append(&sessionId, sizeof(sessionId)));

    channelMask.Init();
    channelMask.SetMask(aChannelMask);
    SuccessOrExit(error = message->Append(&channelMask, sizeof(channelMask)));

    panId.Init();
    panId.SetPanId(aPanId);
    SuccessOrExit(error = message->Append(&panId, sizeof(panId)));

    messageInfo.SetSockAddr(netif.GetMle().GetMeshLocal16());
    messageInfo.SetPeerAddr(aAddress);
    messageInfo.SetPeerPort(kCoapUdpPort);
    messageInfo.SetInterfaceId(netif.GetInterfaceId());
    SuccessOrExit(error = netif.GetCoap().SendMessage(*message, messageInfo));

    otLogInfoMeshCoP(GetInstance(), "sent panid query");

    mCallback = aCallback;
    mContext = aContext;

exit:

    if (error != OT_ERROR_NONE && message != NULL)
    {
        message->Free();
    }

    return error;
}

otError Dataset::AppendMleDatasetTlv(Message &aMessage) const
{
    otError        error = OT_ERROR_NONE;
    Mle::Tlv       tlv;
    Mle::Tlv::Type type;
    const Tlv *    cur = reinterpret_cast<const Tlv *>(mTlvs);
    const Tlv *    end = reinterpret_cast<const Tlv *>(mTlvs + mLength);

    VerifyOrExit(mLength > 0);

    type = (mType == Tlv::kActiveTimestamp ? Mle::Tlv::kActiveDataset : Mle::Tlv::kPendingDataset);

    tlv.SetType(type);
    tlv.SetLength(static_cast<uint8_t>(mLength) - sizeof(Tlv) - sizeof(Timestamp));
    SuccessOrExit(error = aMessage.Append(&tlv, sizeof(Tlv)));

    while (cur < end)
    {
        if (cur->GetType() == mType)
        {
            ; // skip Active or Pending Timestamp TLV
        }
        else if (cur->GetType() == Tlv::kDelayTimer)
        {
            uint32_t      elapsed = TimerMilli::GetNow() - mUpdateTime;
            DelayTimerTlv delayTimer(static_cast<const DelayTimerTlv &>(*cur));

            if (delayTimer.GetDelayTimer() > elapsed)
            {
                delayTimer.SetDelayTimer(delayTimer.GetDelayTimer() - elapsed);
            }
            else
            {
                delayTimer.SetDelayTimer(0);
            }

            SuccessOrExit(error = aMessage.Append(&delayTimer, sizeof(delayTimer)));
        }
        else
        {
            SuccessOrExit(error = aMessage.Append(cur, sizeof(Tlv) + cur->GetLength()));
        }

        cur = cur->GetNext();
    }

exit:
    return error;
}

void ChildSupervisor::SendMessage(Child &aChild)
{
    ThreadNetif &netif = GetNetif();
    Message *message = NULL;
    otError error = OT_ERROR_NONE;
    uint8_t childIndex;

    VerifyOrExit(aChild.GetIndirectMessageCount() == 0);

    message = netif.GetInstance().mMessagePool.New(Message::kTypeSupervision, sizeof(uint8_t));
    VerifyOrExit(message != NULL);

    // Supervision message is an empty payload 15.4 data frame.
    // The child index is stored here in the message content to allow
    // the destination of the message to be later retrieved using
    // `ChildSupervisor::GetDestination(message)`.

    childIndex = netif.GetMle().GetChildIndex(aChild);
    SuccessOrExit(error = message->Append(&childIndex, sizeof(childIndex)));

    SuccessOrExit(error = netif.SendMessage(*message));
    message = NULL;

    otLogInfoMle(GetInstance(), "Sending supervision message to child 0x%04x", aChild.GetRloc16());

exit:

    if (message != NULL)
    {
        message->Free();
    }
}

otError Dhcp6Server::AppendRapidCommit(Message &aMessage)
{
    RapidCommit option;

    option.Init();
    return aMessage.Append(&option, sizeof(option));
}

void ChildSupervisor::SendMessage(Child &aChild)
{
    Message *message = NULL;
    uint8_t  childIndex;

    VerifyOrExit(aChild.GetIndirectMessageCount() == 0);

    message = Get<MessagePool>().New(Message::kTypeSupervision, sizeof(uint8_t));
    VerifyOrExit(message != NULL);

    // Supervision message is an empty payload 15.4 data frame.
    // The child index is stored here in the message content to allow
    // the destination of the message to be later retrieved using
    // `ChildSupervisor::GetDestination(message)`.

    childIndex = Get<ChildTable>().GetChildIndex(aChild);
    SuccessOrExit(message->Append(&childIndex, sizeof(childIndex)));

    SuccessOrExit(Get<ThreadNetif>().SendMessage(*message));
    message = NULL;

    otLogInfoUtil("Sending supervision message to child 0x%04x", aChild.GetRloc16());

exit:

    if (message != NULL)
    {
        message->Free();
    }
}

otError Leader::SendKeepAliveResponse(const Coap::Header &aRequestHeader, const Ip6::MessageInfo &aMessageInfo,
                                      StateTlv::State aState)
{
    ThreadNetif &netif = GetNetif();
    otError error = OT_ERROR_NONE;
    Coap::Header responseHeader;
    StateTlv state;
    Message *message;

    responseHeader.SetDefaultResponseHeader(aRequestHeader);
    responseHeader.SetPayloadMarker();

    VerifyOrExit((message = NewMeshCoPMessage(netif.GetCoap(), responseHeader)) != NULL, error = OT_ERROR_NO_BUFS);

    state.Init();
    state.SetState(aState);
    SuccessOrExit(error = message->Append(&state, sizeof(state)));

    SuccessOrExit(error = netif.GetCoap().SendMessage(*message, aMessageInfo));

    otLogInfoMeshCoP(GetInstance(), "sent keep alive response");

exit:

    if (error != OT_ERROR_NONE && message != NULL)
    {
        message->Free();
    }

    return error;
}

otError Leader::SendPetitionResponse(const Coap::Header &aRequestHeader, const Ip6::MessageInfo &aMessageInfo,
                                     StateTlv::State aState)
{
    ThreadNetif &netif = GetNetif();
    otError error = OT_ERROR_NONE;
    Coap::Header responseHeader;
    StateTlv state;
    CommissionerSessionIdTlv sessionId;
    Message *message;

    responseHeader.SetDefaultResponseHeader(aRequestHeader);
    responseHeader.SetPayloadMarker();

    VerifyOrExit((message = NewMeshCoPMessage(netif.GetCoap(), responseHeader)) != NULL, error = OT_ERROR_NO_BUFS);

    state.Init();
    state.SetState(aState);
    SuccessOrExit(error = message->Append(&state, sizeof(state)));

    if (mTimer.IsRunning())
    {
        uint16_t len = sizeof(Tlv) + mCommissionerId.GetLength();
        SuccessOrExit(error = message->Append(&mCommissionerId, len));
    }

    if (aState == StateTlv::kAccept)
    {
        sessionId.Init();
        sessionId.SetCommissionerSessionId(mSessionId);
        SuccessOrExit(error = message->Append(&sessionId, sizeof(sessionId)));
    }

    SuccessOrExit(error = netif.GetCoap().SendMessage(*message, aMessageInfo));

    otLogInfoMeshCoP(GetInstance(), "sent petition response");

exit:

    if (error != OT_ERROR_NONE && message != NULL)
    {
        message->Free();
    }

    return error;
}

ThreadError Local::Register(const Ip6::Address &aDestination)
{
    ThreadError error = kThreadError_None;
    Coap::Header header;
    Message *message;
    Ip6::MessageInfo messageInfo;

    UpdateRloc();
    mSocket.Open(&HandleUdpReceive, this);

    for (size_t i = 0; i < sizeof(mCoapToken); i++)
    {
        mCoapToken[i] = otPlatRandomGet();
    }

    header.Init();
    header.SetVersion(1);
    header.SetType(Coap::Header::kTypeConfirmable);
    header.SetCode(Coap::Header::kCodePost);
    header.SetMessageId(++mCoapMessageId);
    header.SetToken(mCoapToken, sizeof(mCoapToken));
    header.AppendUriPathOptions(OPENTHREAD_URI_SERVER_DATA);
    header.AppendContentFormatOption(Coap::Header::kApplicationOctetStream);
    header.Finalize();

    VerifyOrExit((message = Ip6::Udp::NewMessage(0)) != NULL, error = kThreadError_NoBufs);
    SuccessOrExit(error = message->Append(header.GetBytes(), header.GetLength()));
    SuccessOrExit(error = message->Append(mTlvs, mLength));

    memset(&messageInfo, 0, sizeof(messageInfo));
    memcpy(&messageInfo.mPeerAddr, &aDestination, sizeof(messageInfo.mPeerAddr));
    messageInfo.mPeerPort = kCoapUdpPort;
    SuccessOrExit(error = mSocket.SendTo(*message, messageInfo));

    otLogInfoNetData("Sent network data registration\n");

exit:

    if (error != kThreadError_None && message != NULL)
    {
        Message::Free(*message);
    }

    return error;
}

otError EnergyScanServer::SendReport(void)
{
    otError                  error = OT_ERROR_NONE;
    Coap::Header             header;
    MeshCoP::ChannelMask0Tlv channelMask;
    MeshCoP::EnergyListTlv   energyList;
    Ip6::MessageInfo         messageInfo;
    Message *                message;

    header.Init(OT_COAP_TYPE_CONFIRMABLE, OT_COAP_CODE_POST);
    header.SetToken(Coap::Header::kDefaultTokenLength);
    header.AppendUriPathOptions(OT_URI_PATH_ENERGY_REPORT);
    header.SetPayloadMarker();

    VerifyOrExit((message = MeshCoP::NewMeshCoPMessage(GetNetif().GetCoap(), header)) != NULL,
                 error = OT_ERROR_NO_BUFS);

    channelMask.Init();
    channelMask.SetMask(mChannelMask);
    SuccessOrExit(error = message->Append(&channelMask, sizeof(channelMask)));

    energyList.Init();
    energyList.SetLength(mScanResultsLength);
    SuccessOrExit(error = message->Append(&energyList, sizeof(energyList)));
    SuccessOrExit(error = message->Append(mScanResults, mScanResultsLength));

    messageInfo.SetSockAddr(GetNetif().GetMle().GetMeshLocal16());
    messageInfo.SetPeerAddr(mCommissioner);
    messageInfo.SetPeerPort(kCoapUdpPort);
    SuccessOrExit(error = GetNetif().GetCoap().SendMessage(*message, messageInfo));

    otLogInfoMeshCoP(GetInstance(), "sent scan results");

exit:

    if (error != OT_ERROR_NONE && message != NULL)
    {
        message->Free();
    }

    mActive = false;

    return error;
}

otError Dhcp6Server::AppendServerIdentifier(Message &aMessage)
{
    otError error = OT_ERROR_NONE;
    ServerIdentifier option;

    option.Init();
    option.SetDuidType(kDuidLL);
    option.SetDuidHardwareType(kHardwareTypeEui64);
    option.SetDuidLinkLayerAddress(GetNetif().GetMac().GetExtAddress());
    SuccessOrExit(error = aMessage.Append(&option, sizeof(option)));

exit:
    return error;
}

otError Dhcp6Server::AddIaAddress(Message &aMessage, otIp6Prefix &aIp6Prefix, ClientIdentifier &aClient)
{
    otError error = OT_ERROR_NONE;
    IaAddress option;

    option.Init();
    memcpy((option.GetAddress()->mFields.m8), &(aIp6Prefix.mPrefix), 8);
    memcpy(&(option.GetAddress()->mFields.m8[8]), aClient.GetDuidLinkLayerAddress(), sizeof(Mac::ExtAddress));
    option.SetPreferredLifetime(OT_DHCP6_DEFAULT_PREFERRED_LIFETIME);
    option.SetValidLifetime(OT_DHCP6_DEFAULT_VALID_LIFETIME);
    SuccessOrExit(error = aMessage.Append(&option, sizeof(option)));
exit:
    return error;
}

void CoapSecure::HandleDtlsReceive(uint8_t *aBuf, uint16_t aLength)
{
    Message *message = NULL;

    VerifyOrExit((message = GetInstance().GetMessagePool().New(Message::kTypeIp6, 0)) != NULL);
    SuccessOrExit(message->Append(aBuf, aLength));

    CoapBase::Receive(*message, mPeerAddress);

exit:

    if (message != NULL)
    {
        message->Free();
    }
}

ThreadError DatasetManager::Register(void)
{
    ThreadError error = kThreadError_None;
    Coap::Header header;
    Message *message;
    Ip6::Address leader;
    Ip6::MessageInfo messageInfo;

    header.Init(kCoapTypeConfirmable, kCoapRequestPost);
    header.SetToken(Coap::Header::kDefaultTokenLength);
    header.AppendUriPathOptions(mUriSet);
    header.SetPayloadMarker();

    if (strcmp(mUriSet, OPENTHREAD_URI_PENDING_SET) == 0)
    {
        PendingDatasetBase *pending = static_cast<PendingDatasetBase *>(this);
        pending->UpdateDelayTimer();
    }

    VerifyOrExit((message = mNetif.GetCoapClient().NewMeshCoPMessage(header)) != NULL, error = kThreadError_NoBufs);

    SuccessOrExit(error = message->Append(mLocal.GetBytes(), mLocal.GetSize()));

    mNetif.GetMle().GetLeaderAloc(leader);

    messageInfo.SetPeerAddr(leader);
    messageInfo.SetPeerPort(kCoapUdpPort);
    SuccessOrExit(error = mNetif.GetCoapClient().SendMessage(*message, messageInfo));

    otLogInfoMeshCoP("sent dataset to leader");

exit:

    if (error != kThreadError_None && message != NULL)
    {
        message->Free();
    }

    return error;
}

 /**
  * This method appends MPL Buffered Message metadata to the message.
  *
  * @param[in]  aMessage  A reference to the message.
  *
  * @retval OT_ERROR_NONE     Successfully appended the bytes.
  * @retval OT_ERROR_NO_BUFS  Insufficient available buffers to grow the message.
  *
  */
 otError AppendTo(Message &aMessage) const {
     return aMessage.Append(this, sizeof(*this));
 };