src/platform/OpenThread/MdnsImpl.cpp

/*
 *
 *    Copyright (c) 2021 Project CHIP Authors
 *
 *    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.
 */

#include "lib/mdns/platform/Mdns.h"

#include <platform/CHIPDeviceLayer.h>
#include <platform/OpenThread/OpenThreadUtils.h>
#include <support/CodeUtils.h>

using namespace ::chip::DeviceLayer;

namespace chip {
namespace Mdns {

CHIP_ERROR ChipMdnsInit(MdnsAsyncReturnCallback initCallback, MdnsAsyncReturnCallback errorCallback, void * context)
{
    // Intentionally empty
    return CHIP_NO_ERROR;
}

CHIP_ERROR ChipMdnsSetHostname(const char * hostname)
{
    return ThreadStackMgr().SetupSrpHost(hostname);
}

const char * GetProtocolString(MdnsServiceProtocol protocol)
{
    return protocol == MdnsServiceProtocol::kMdnsProtocolUdp ? "_udp" : "_tcp";
}

CHIP_ERROR ChipMdnsPublishService(const MdnsService * service)
{
    CHIP_ERROR result = CHIP_NO_ERROR;

    VerifyOrExit(service, result = CHIP_ERROR_INVALID_ARGUMENT);

    char serviceType[chip::Mdns::kMdnsTypeAndProtocolMaxSize + 1];
    snprintf(serviceType, sizeof(serviceType), "%s.%s", service->mType, GetProtocolString(service->mProtocol));

    // Try to remove service before adding it, as SRP doesn't allow to update existing services.
    result = ThreadStackMgr().RemoveSrpService(service->mName, serviceType);

    // Service should be successfully removed or not found (not exists).
    VerifyOrExit((result == CHIP_NO_ERROR) || (result == Internal::MapOpenThreadError(OT_ERROR_NOT_FOUND)), );

    result =
        ThreadStackMgr().AddSrpService(service->mName, serviceType, service->mPort, service->mTextEntries, service->mTextEntrySize);

exit:
    return result;
}

CHIP_ERROR ChipMdnsStopPublish()
{
    return ThreadStackMgr().RemoveAllSrpServices();
}

CHIP_ERROR ChipMdnsStopPublishService(const MdnsService * service)
{
    if (service == nullptr)
        return CHIP_ERROR_INVALID_ARGUMENT;

    char serviceType[chip::Mdns::kMdnsTypeAndProtocolMaxSize + 1];
    snprintf(serviceType, sizeof(serviceType), "%s.%s", service->mType, GetProtocolString(service->mProtocol));

    return ThreadStackMgr().RemoveSrpService(service->mName, serviceType);
}

CHIP_ERROR ChipMdnsBrowse(const char * type, MdnsServiceProtocol protocol, Inet::IPAddressType addressType,
                          Inet::InterfaceId interface, MdnsBrowseCallback callback, void * context)
{
    return CHIP_ERROR_NOT_IMPLEMENTED;
}

CHIP_ERROR ChipMdnsResolve(MdnsService * browseResult, Inet::InterfaceId interface, MdnsResolveCallback callback, void * context)
{
    return CHIP_ERROR_NOT_IMPLEMENTED;
}

} // namespace Mdns
} // namespace chip