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[/] [branches/] [gnubinutils/] [rom/] [dnsdefs.inc] - Rev 384

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;The MIT License
;
;Copyright (c) 2008 Dylan Smith
;
;Permission is hereby granted, free of charge, to any person obtaining a copy
;of this software and associated documentation files (the "Software"), to deal
;in the Software without restriction, including without limitation the rights
;to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
;copies of the Software, and to permit persons to whom the Software is
;furnished to do so, subject to the following conditions:
;
;The above copyright notice and this permission notice shall be included in
;all copies or substantial portions of the Software.
;
;THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
;IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
;FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
;AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
;LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
;OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
;THE SOFTWARE.

; Definitions for querying DNS
;
; Most of the fields for a standard DNS 'A' record lookup will not change
; so the fields are defined here so they get flashed into the ROM.
; See RFC 1035 for full descriptions of the fields.

; Definitions
dns_headerlen   equ 12          ; 12 bytes long
dns_Arecord     equ 1           ; A record indicator in query/answer
dns_port        equ 53          ; port 53/udp
dns_polltime    equ 16384       ; How long to poll for DNS response

; Offsets to the fields of the DNS message header
dns_serial      equ 0           ; Two byte serial number
dns_bitfield1   equ 2           ; First 8 bits of the flags bitfield
dns_bitfield2   equ 3           ; Last 8 bits of the flags bitfield
dns_qdcount     equ 4           ; Number of questions (2 bytes, big endian)
dns_ancount     equ 6           ; Number of resource records
dns_nscount     equ 8           ; Number of NS records
dns_arcount     equ 10          ; Number of additional records


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