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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1997-2023. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
%%
%% Definition for Domain Name System
%%
%%
%% Currently defined opcodes
%%
-define(QUERY, 16#0). %% standard query
-define(IQUERY, 16#1). %% inverse query
-define(STATUS, 16#2). %% nameserver status query
%% -define(xxx, 16#3) %% 16#3 reserved
%% non standard
-define(UPDATEA, 16#9). %% add resource record
-define(UPDATED, 16#a). %% delete a specific resource record
-define(UPDATEDA, 16#b). %% delete all nemed resource record
-define(UPDATEM, 16#c). %% modify a specific resource record
-define(UPDATEMA, 16#d). %% modify all named resource record
-define(ZONEINIT, 16#e). %% initial zone transfer
-define(ZONEREF, 16#f). %% incremental zone referesh
%%
%% Currently defined response codes
%%
-define(NOERROR, 0). %% no error
-define(FORMERR, 1). %% format error
-define(SERVFAIL, 2). %% server failure
-define(NXDOMAIN, 3). %% non existent domain
-define(NOTIMP, 4). %% not implemented
-define(REFUSED, 5). %% query refused
%% non standard
-define(NOCHANGE, 16#f). %% update failed to change db
-define(BADVERS, 16).
%%
%% Type values for resources and queries
%%
-define(T_A, 1). %% host address
-define(T_NS, 2). %% authoritative server
-define(T_MD, 3). %% mail destination
-define(T_MF, 4). %% mail forwarder
-define(T_CNAME, 5). %% connonical name
-define(T_SOA, 6). %% start of authority zone
-define(T_MB, 7). %% mailbox domain name
-define(T_MG, 8). %% mail group member
-define(T_MR, 9). %% mail rename name
-define(T_NULL, 10). %% null resource record
-define(T_WKS, 11). %% well known service
-define(T_PTR, 12). %% domain name pointer
-define(T_HINFO, 13). %% host information
-define(T_MINFO, 14). %% mailbox information
-define(T_MX, 15). %% mail routing information
-define(T_TXT, 16). %% text strings
-define(T_AAAA, 28). %% ipv6 address
%% LOC (RFC 1876)
-define(T_LOC, 29). %% location information
%% SRV (RFC 2052)
-define(T_SRV, 33). %% services
%% NAPTR (RFC 2915)
-define(T_NAPTR, 35). %% naming authority pointer
-define(T_OPT, 41). %% EDNS pseudo-rr RFC6891(7)
%% SPF (RFC 4408)
-define(T_SPF, 99). %% server policy framework
%% non standard
-define(T_UINFO, 100). %% user (finger) information
-define(T_UID, 101). %% user ID
-define(T_GID, 102). %% group ID
-define(T_UNSPEC, 103). %% Unspecified format (binary data)
%% Query type values which do not appear in resource records
-define(T_AXFR, 252). %% transfer zone of authority
-define(T_MAILB, 253). %% transfer mailbox records
-define(T_MAILA, 254). %% transfer mail agent records
-define(T_ANY, 255). %% wildcard match
%% URI (RFC 7553)
-define(T_URI, 256). %% uniform resource identifier
%% CAA (RFC 6844)
-define(T_CAA, 257). %% certification authority authorization
%%
%% Symbolic Type values for resources and queries
%%
-define(S_A, a). %% host address
-define(S_NS, ns). %% authoritative server
-define(S_MD, md). %% mail destination
-define(S_MF, mf). %% mail forwarder
-define(S_CNAME, cname). %% connonical name
-define(S_SOA, soa). %% start of authority zone
-define(S_MB, mb). %% mailbox domain name
-define(S_MG, mg). %% mail group member
-define(S_MR, mr). %% mail rename name
-define(S_NULL, null). %% null resource record
-define(S_WKS, wks). %% well known service
-define(S_PTR, ptr). %% domain name pointer
-define(S_HINFO, hinfo). %% host information
-define(S_MINFO, minfo). %% mailbox information
-define(S_MX, mx). %% mail routing information
-define(S_TXT, txt). %% text strings
-define(S_AAAA, aaaa). %% ipv6 address
%% LOC (RFC 1876)
-define(S_LOC, loc). %% location information
%% SRV (RFC 2052)
-define(S_SRV, srv). %% services
%% NAPTR (RFC 2915)
-define(S_NAPTR, naptr). %% naming authority pointer
-define(S_OPT, opt). %% EDNS pseudo-rr RFC6891(7)
%% SPF (RFC 4408)
-define(S_SPF, spf). %% server policy framework
%% non standard
-define(S_UINFO, uinfo). %% user (finger) information
-define(S_UID, uid). %% user ID
-define(S_GID, gid). %% group ID
-define(S_UNSPEC, unspec). %% Unspecified format (binary data)
%% Query type values which do not appear in resource records
-define(S_AXFR, axfr). %% transfer zone of authority
-define(S_MAILB, mailb). %% transfer mailbox records
-define(S_MAILA, maila). %% transfer mail agent records
-define(S_ANY, any). %% wildcard match
%% URI (RFC 7553)
-define(S_URI, uri). %% uniform resource identifier
%% CAA (RFC 6844)
-define(S_CAA, caa). %% certification authority authorization
%%
%% Values for class field
%%
-define(C_IN, 1). %% the arpa internet
-define(C_CHAOS, 3). %% for chaos net at MIT
-define(C_HS, 4). %% for Hesiod name server at MIT
%% Query class values which do not appear in resource records
-define(C_ANY, 255). %% wildcard match
%% indirection mask for compressed domain names
-define(INDIR_MASK, 16#c0).
%%
%% Structure for query header, the order of the fields is machine and
%% compiler dependent, in our case, the bits within a byte are assignd
%% least significant first, while the order of transmission is most
%% significant first. This requires a somewhat confusing rearrangement.
%%
-record(dns_header,
{
id = 0, %% ushort query identification number
%% byte F0
qr = 0, %% :1 response flag
opcode = 0, %% :4 purpose of message
aa = 0, %% :1 authoritative answer
tc = 0, %% :1 truncated message
rd = 0, %% :1 recursion desired
%% byte F1
ra = 0, %% :1 recursion available
pr = 0, %% :1 primary server required (non standard)
%% :2 unused bits
rcode = 0 %% :4 response code
}).
-record(dns_rec,
{
header, %% dns_header record
qdlist = [], %% list of question entries
anlist = [], %% list of answer entries
nslist = [], %% list of authority entries
arlist = [] %% list of resource entries
}).
%% DNS resource record
-record(dns_rr,
{
domain = "", %% resource domain
type = any, %% resource type
class = in, %% reource class
cnt = 0, %% access count
ttl = 0, %% time to live
data = [], %% raw data
%%
tm, %% creation time
bm = "", %% Used to be defined as:
%% Bitmap storing domain character case information
%% but now; Case normalized domain
func = false %% Was: Optional function calculating the data field.
%% Now: cache-flush Class flag from mDNS RFC 6762
}).
-define(DNS_UDP_PAYLOAD_SIZE, 1280).
-record(dns_rr_opt, %% EDNS RR OPT (RFC6891), dns_rr{type=opt}
{
domain = "", %% should be the root domain
type = opt,
udp_payload_size = ?DNS_UDP_PAYLOAD_SIZE, %% RFC6891(6.2.3 CLASS)
ext_rcode = 0, %% RFC6891(6.1.3 EXTENDED-RCODE)
version = 0, %% RFC6891(6.1.3 VERSION)
z = 0, %% RFC6891(6.1.3 Z)
data = [], %% RFC6891(6.1.2 RDATA)
do = false %% RFC6891(6.1.3 DO)
}).
-record(dns_query,
{
domain, %% query domain
type, %% query type
class, %% query class
unicast_response = false %% mDNS RFC 6762 Class flag
}).
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