/** @file ../include/arpa/nameser.h
@internalComponent
*/

/** @def  NS_PACKETSZ

maximum packet size

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*/


/** @def  NS_MAXDNAME

maximum domain name

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*/


/** @def  NS_MAXCDNAME

maximum compressed domain name

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*/


/** @def  NS_MAXLABEL

maximum length of domain label

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*/


/** @def  NS_HFIXEDSZ

bytes of fixed data in header

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*/


/** @def  NS_QFIXEDSZ

bytes of fixed data in query

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*/


/** @def  NS_RRFIXEDSZ

bytes of fixed data in r record 

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*/


/** @def  NS_INT32SZ

bytes of data in a u_int32_t

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*/

/** @def  NS_INT16SZ

bytes of data in a u_int16_t

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*/

/** @def  NS_INT8SZ

bytes of data in a u_int8_t 

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*/

/** @def  NS_INADDRSZ

IPv4 T_A

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*/

/** @def  NS_IN6ADDRSZ

IPv6 T_AAAA

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*/

/** @def  NS_CMPRSFLGS

Flag bits indicating name compression.

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*/

/** @def  NS_DEFAULTPORT

For both TCP and UDP.

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*/
  
/** @typedef typedef enum __ns_sect ns_sect

These can be expanded with synonyms, just keep ns_parse.c:ns_parserecord() in synch with it.

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*/

  
/** @typedef typedef struct __ns_msg ns_msg

This is a message handle.  It is caller allocated and has no dynamic data.
This structure is intended to be opaque to all but ns_parse.c, thus the leading _'s on the member names.  Use the accessor functions, not the _'s.

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*/

/** @typedef typedef	struct __ns_rr ns_rr

This is a parsed record.  It is caller allocated and has no dynamic data.

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*/


/** @typedef typedef enum __ns_flag  ns_flag

These don't have to be in the same order as in the packet flags word, and they can even overlap in some cases, but they will need to be kept in synch with ns_parse.c:ns_flagdata[].

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*/


/** @typedef typedef enum __ns_opcode ns_opcode

Currently defined opcodes.

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*/

/** @typedef typedef  enum __ns_rcode ns_rcode

Currently defined response codes.

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*/

/** @typedef typedef enum __ns_update_operation  ns_update_operation

BIND_UPDATE

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*/


/** @struct ns_updrec 

This RR-like structure is particular to UPDATE.

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*/

/** @var ns_updrec::r_prev
prev record
*/

/** @var ns_updrec::r_next
next record
*/

/** @var ns_updrec::r_section
ZONE or PREREQUISITE or UPDATE
*/

/** @var ns_updrec::r_dname
owner of the RR
*/
	
/** @var ns_updrec::r_class
class number
*/

/** @var ns_updrec::r_type
type number
*/

/** @var ns_updrec::r_ttl
time to live
*/

/** @var ns_updrec::r_data
rdata fields as text string 
*/

/** @var ns_updrec::r_size
size of r_data field
*/

/** @var ns_updrec::r_opcode
type of operation
*/

/** @var ns_updrec::r_grpnext
next record when grouped
*/

/** @var ns_updrec::r_dp
databuf to process
*/

/** @var ns_updrec::r_deldp
databuf's deleted or overwritten
*/

/** @var ns_updrec::r_zone
zone number on server
*/

/** @typedef typedef enum __ns_type ns_type

Currently defined type values for resources and queries.

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*/

/** @typedef typedef enum __ns_class ns_class

Values for class field

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*/