mDNSMacOSX/BonjourTop/source/DNSFrame.h

   1 //
   2 //  DNSFrame.h
   3 //  TestTB
   4 //
   5 //  Created by Terrin Eager on 9/26/12.
   6 //
   7 //
   8
   9 #ifndef __TestTB__DNSFrame__
  10 #define __TestTB__DNSFrame__
  11
  12 #include <iostream>
  13 #include "bjtypes.h"
  14 #include "bjstring.h"
  15 #include "bjIPAddr.h"
  16 #include "bjMACAddr.h"
  17
  18 #define MAX_DNS_RECORDS_PER_FRAME 500
  19
  20 #define DNS_TYPE_PTR    12
  21 #define DNS_TYPE_SRV    33
  22 #define DNS_TYPE_TXT    16
  23 #define DNS_TYPE_A      1
  24 #define DNS_TYPE_AAAA   28
  25 #define DNS_TYPE_OPT    41
  26
  27 #define DNS_EDNS0_TRACE 65001
  28
  29 class CDNSFrame;
  30
  31
  32
  33
  34 class CDNSRecord
  35 {
  36 public:
  37     typedef enum {Question,Answer,ns,ar} dnsItemType;
  38
  39     void GetDnsRecordName(BJString& ReturnString,int nLabelToSkip,int nMaxLabel);
  40     void GetDnsRecordNameFromBuffer(BJ_UINT8* pBuffer,BJString& ReturnString,int nLabelToSkip,int nMaxLabel);
  41
  42     BJ_UINT8* GetStartofRdata() {return m_pStartofRec+m_nNameLength+10;}; // 10 = type(2) +class(2) + ttl(4) + datalen(2)
  43     void GetRdata(BJString& ReturnString,int nLabelToSkip,int nMaxLabel)
  44     {
  45         if (m_RecType == DNS_TYPE_SRV)
  46             GetDnsRecordNameFromBuffer(GetStartofRdata()+6, ReturnString, nLabelToSkip, nMaxLabel); // 6 = Priority + Weight + Port
  47         else
  48             GetDnsRecordNameFromBuffer(GetStartofRdata(), ReturnString, nLabelToSkip, nMaxLabel);
  49     }
  50     dnsItemType m_dnsType;
  51     BJ_UINT8*   m_pStartofRec;
  52     BJ_UINT32   m_nNameLength;
  53     BJ_INT16    m_RecType;
  54     BJ_INT16    m_RecClass;
  55     BJ_UINT32   m_nTTL;
  56     BJ_UINT32   m_nRdataLen;
  57
  58     CDNSFrame*  m_pDNSFrame;
  59 };
  60
  61
  62
  63 class CDNSFrame
  64 {
  65 public:
  66
  67     CDNSFrame();
  68     bool ParseDNSFrame(BJ_UINT8* pBuffer,BJ_INT32 nLength,BJ_UINT64 frameTime);
  69
  70
  71     CDNSRecord* GetDnsRecord(int nIndex);
  72     CDNSRecord* FindAdditionRecord(BJString& sName, BJ_INT16 nType);
  73
  74     BJ_UINT16 GetQuestionCount() {return m_nQuestionCount;};
  75     BJ_UINT16 GetAnswerCount(){return m_nAnswersCount;};
  76     BJ_UINT16 GetMaxRecords(){return m_nMaxItems;};
  77     BJ_UINT8* GetBuffer() { return m_pStartBuffer;};
  78
  79     BJ_BOOL ParseDnsRecord(CDNSRecord::dnsItemType eItemType);
  80
  81     BJ_BOOL IsQueryFrame();
  82     BJ_BOOL IsWakeFrame();
  83     BJ_BOOL IsTruncatedFrame();
  84
  85     BJ_BOOL HasOnlyService(BJString sName, BJ_INT16 nRecType);
  86
  87     void SetAddress(BJIPAddr *SourceIPAddress,BJMACAddr *SourceMACAddress);
  88
  89     bool GetTracingInfo(BJ_UINT8 &platform, BJ_UINT32 &version, BJMACAddr &mac);
  90
  91     BJ_UINT64 GetTime() {return m_Time;};
  92
  93
  94     BJIPAddr m_Servicev4Address;
  95     BJIPAddr m_Servicev6Address;
  96
  97     BJIPAddr   m_SourceIPAddress;
  98     BJMACAddr  m_SourceMACAddress;
  99
 100 protected:
 101
 102
 103     BJ_UINT8* m_pStartBuffer;
 104     BJ_UINT8* m_pEndBuffer;
 105     BJ_UINT8* m_pCurrentBuffer;
 106     BJ_INT32  m_nBufferLen;
 107
 108     BJ_INT32 m_nFrameLen;
 109
 110     // Header
 111     BJ_UINT16 m_nId;
 112     BJ_UINT16 m_nFlags;
 113
 114     BJ_UINT16 m_nQuestionCount;
 115     BJ_UINT16 m_nAnswersCount;
 116     BJ_UINT16 m_NSCOUNT;
 117     BJ_UINT16 m_ARCOUNT;
 118
 119
 120     CDNSRecord m_dnsItems[MAX_DNS_RECORDS_PER_FRAME];
 121
 122     int m_nMaxItems;
 123
 124     BJ_UINT64 m_Time;
 125
 126 };
 127
 128
 129
 130
 131
 132 #endif /* defined(__TestTB__DNSFrame__) */