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Custom Code in Header After Includes Declared in:
DNSAnswers.h

'Custom Code' icon -- Shortcut to top of page. Custom Code

class CDNSQuery;

// Header of the DNS header
typedef struct _DnsHeaderHeader
{
    unsigned short      usID;               // DNS header ID
    unsigned short      usOptions;          // Too many fields
    unsigned short      usQDCount;
    unsigned short      usANCount;
    unsigned short      usNSCount;
    unsigned short      usARCount;

    //Initialize ctor
    _DnsHeaderHeader() : usID(0),
                         usOptions(0),
                         usQDCount(0),
                         usANCount(0),
                         usNSCount(0),
                         usARCount(0)
    {
    }
} DnsHeaderHeader;
typedef DnsHeaderHeader FAR * LPDnsHeaderHeader;
#define DnsHeaderHeaderLength sizeof(DnsHeaderHeader)

//DNS headers variables
#define DNS_QR_REQUEST 0            //Request DNS entry
#define DNS_QR_REPLY (1 << 7)       //DNS reply

//four bit field that specifies kind of query in this message
#define DNS_OPCODE_STANDARD 0
#define DNS_OPCODE_INVERSE (1 << 3)
#define DNS_OPCODE_STATUS (2 << 3)

//Authoritative Answer - this bit is valid in responses,
//and specifies that the responding name server is an
//authority for the domain name in question section.
#define DNS_AA (1 << 2)

//Recursion Desired - this bit may be set in a query and
//is copied into the response.  If RD is set, it directs
//the name server to pursue the query recursively.
//Recursive query support is optional.
#define DNS_RECURSION 1

//Recursion Available - this be is set or cleared in a
//response, and denotes whether recursive query support is
//available in the name server.
#define DNS_RECURSION_AVAILABLE (1 << 8)

//Response code - this 4 bit field is set as part of
//responses.  The values have the following
//interpretation
#define DNS_RCODE_NOERROR 0
#define DNS_RCODE_FORMAT (1 << 13)
#define DNS_RCODE_SERVER (2 << 13)
#define DNS_RCODE_NAME (3 << 13)
#define DNS_RCODE_REFUSED (5 << 13)

//Server failure
#define DNS_SERVER_FAILURE (3 << 8)

'See Also' icon -- Shortcut to top of page. See Also

Class Overview Class Overview  |  Public base class CErrorHandler  |  Hierarchy Chart Hierarchy Chart


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