Line data    Source code

       1              : /*
       2              :  *
       3              :  *    Copyright (c) 2020 Project CHIP Authors
       4              :  *
       5              :  *    Licensed under the Apache License, Version 2.0 (the "License");
       6              :  *    you may not use this file except in compliance with the License.
       7              :  *    You may obtain a copy of the License at
       8              :  *
       9              :  *        http://www.apache.org/licenses/LICENSE-2.0
      10              :  *
      11              :  *    Unless required by applicable law or agreed to in writing, software
      12              :  *    distributed under the License is distributed on an "AS IS" BASIS,
      13              :  *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      14              :  *    See the License for the specific language governing permissions and
      15              :  *    limitations under the License.
      16              :  */
      17              : 
      18              : #pragma once
      19              : 
      20              : #include <lib/support/BufferWriter.h>
      21              : 
      22              : #include <lib/dnssd/minimal_mdns/core/Constants.h>
      23              : #include <lib/dnssd/minimal_mdns/core/QName.h>
      24              : #include <lib/dnssd/minimal_mdns/core/RecordWriter.h>
      25              : 
      26              : namespace mdns {
      27              : namespace Minimal {
      28              : 
      29              : /// Represents a MDNS Query: QName and flags
      30              : class Query
      31              : {
      32              : public:
      33            0 :     Query(FullQName name) : mQName(name) {}
      34              : 
      35              :     bool IsAnswerViaUnicast() const { return mAnswerViaUnicast; }
      36            0 :     Query & SetAnswerViaUnicast(bool value)
      37              :     {
      38            0 :         mAnswerViaUnicast = value;
      39            0 :         return *this;
      40              :     }
      41              : 
      42              :     QType GetType() const { return mType; }
      43            0 :     Query & SetType(QType value)
      44              :     {
      45            0 :         mType = value;
      46            0 :         return *this;
      47              :     }
      48              : 
      49              :     QClass GetClass() const { return mClass; }
      50            0 :     Query & SetClass(QClass value)
      51              :     {
      52            0 :         mClass = value;
      53            0 :         return *this;
      54              :     }
      55              : 
      56              :     const FullQName & GetName() const { return mQName; }
      57              : 
      58              :     /// Append the query to the specified buffer
      59              :     ///
      60              :     /// @param hdr will be updated with a query count
      61              :     /// @param out where to write the query data
      62            0 :     bool Append(HeaderRef & hdr, RecordWriter & out) const
      63              :     {
      64              :         // Questions can only be appended before any other data is added
      65            0 :         if ((hdr.GetAdditionalCount() != 0) || (hdr.GetAnswerCount() != 0) || (hdr.GetAuthorityCount() != 0))
      66              :         {
      67            0 :             return false;
      68              :         }
      69              : 
      70            0 :         out.WriteQName(mQName)
      71            0 :             .Put16(static_cast<uint16_t>(mType))
      72            0 :             .Put16(static_cast<uint16_t>(static_cast<uint16_t>(mClass) | (mAnswerViaUnicast ? kQClassUnicastAnswerFlag : 0)));
      73              : 
      74            0 :         if (!out.Fit())
      75              :         {
      76            0 :             return false;
      77              :         }
      78              : 
      79            0 :         hdr.SetQueryCount(static_cast<uint16_t>(hdr.GetQueryCount() + 1));
      80            0 :         return true;
      81              :     }
      82              : 
      83              : private:
      84              :     const FullQName mQName;
      85              :     QType mType            = QType::ANY;
      86              :     QClass mClass          = QClass::IN;
      87              :     bool mAnswerViaUnicast = true;
      88              : };
      89              : 
      90              : } // namespace Minimal
      91              : 
      92              : } // namespace mdns