File 6580-inet_dns-support-TSIG.patch of Package erlang

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File 6580-inet_dns-support-TSIG.patch of Package erlang (Revision c4d0cccff3408fb870c23d419a1f7548)

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From 2473a414da546440636e722dd794c2e12ad892f0 Mon Sep 17 00:00:00 2001
From: Alexander Clouter <alex@digriz.org.uk>
Date: Wed, 9 Aug 2023 16:38:55 +0100
Subject: [PATCH 10/10] inet_dns: support TSIG

---
 lib/kernel/src/Makefile                       |   2 +
 lib/kernel/src/inet_dns.erl                   |  86 ++-
 lib/kernel/src/inet_dns.hrl                   |  48 ++
 lib/kernel/src/inet_dns_tsig.erl              | 319 +++++++++++
 lib/kernel/src/inet_res.erl                   |  13 +-
 lib/kernel/src/kernel.app.src                 |   1 +
 lib/kernel/test/inet_res_SUITE.erl            | 195 ++++++-
 .../inet_res_SUITE_data/otptest/knot_inc.conf |  13 +-
 .../inet_res_SUITE_data/otptest/otptest.zone  | 507 ++++++++++++++++++
 9 files changed, 1178 insertions(+), 6 deletions(-)
 create mode 100644 lib/kernel/src/inet_dns_tsig.erl

diff --git a/lib/kernel/src/Makefile b/lib/kernel/src/Makefile
index f67044f5e7..929f1d2c4e 100644
--- a/lib/kernel/src/Makefile
+++ b/lib/kernel/src/Makefile
@@ -100,6 +100,7 @@ MODULES = \
 	inet_config \
 	inet_db \
 	inet_dns \
+	inet_dns_tsig \
 	inet_gethost_native \
 	inet_hosts \
 	inet_parse \
@@ -266,6 +267,7 @@ $(EBIN)/inet6_sctp.beam: inet_int.hrl
 $(EBIN)/inet_config.beam: inet_config.hrl ../include/inet.hrl
 $(EBIN)/inet_db.beam: ../include/inet.hrl inet_int.hrl inet_res.hrl inet_dns.hrl inet_config.hrl
 $(EBIN)/inet_dns.beam: inet_int.hrl inet_dns.hrl inet_dns_record_adts.hrl
+$(EBIN)/inet_dns_tsig.beam: inet_dns.hrl
 $(EBIN)/inet_gethost_native.beam: ../include/inet.hrl
 $(EBIN)/inet_hosts.beam: ../include/inet.hrl
 $(EBIN)/inet_parse.beam: ../include/file.hrl
diff --git a/lib/kernel/src/inet_dns.erl b/lib/kernel/src/inet_dns.erl
index 6228ca9790..c65546a7e5 100644
--- a/lib/kernel/src/inet_dns.erl
+++ b/lib/kernel/src/inet_dns.erl
@@ -33,8 +33,10 @@
 %% RFC 6762: Multicast DNS
 %% RFC 6891: Extension Mechanisms for DNS (EDNS0)
 %% RFC 7553: The Uniform Resource Identifier (URI) DNS Resource Record
+%% RFC 8945: Secret Key Transaction Authentication for DNS (TSIG)
 
 -export([decode/1, encode/1]).
+-export([decode_algname/1, encode_algname/1]).
 
 -import(lists, [reverse/1]).
 
@@ -253,6 +255,28 @@ decode_rr_section(Opcode, Bin, N, Buffer, RRs) ->
                           z                = Z,
                           data             = D,
                           do               = DnssecOk};
+                   ?S_TSIG ->
+                       %% RFC 8945: 5.2. FORMERR if not last
+                       %% RFC 8945: 5.2. FORMERR if more than one dns_rr_tsig
+                       %%                        (...covered by being last)
+                       Rest =/= <<>> andalso throw(?DECODE_ERROR),
+                       {DR,AlgName} = decode_name(D, Buffer),
+                       ?MATCH_ELSE_DECODE_ERROR(
+                          DR,
+                          <<Now:48, Fudge:16, MACSize:16, MAC:MACSize/binary,
+                            OriginalId:16, Error:16,
+                            OtherLen:16, OtherData:OtherLen/binary>>,
+                          #dns_rr_tsig{
+                             domain        = Name,
+                             type          = Type,
+                             offset        = byte_size(Buffer) - byte_size(Bin),
+                             algname       = AlgName,
+                             now           = Now,
+                             fudge         = Fudge,
+                             mac           = MAC,
+                             original_id   = OriginalId,
+                             error         = Error,
+                             other_data    = OtherData});
                    _ ->
                        {Class,CacheFlush} = decode_class(C),
                        Data = if
@@ -347,7 +371,22 @@ encode_res_section(
     DO = case DnssecOk of true -> 1; false -> 0 end,
     encode_res_section_rr(
       Opcode, Bin, Comp, Rs, DName, ?S_OPT, UdpPayloadSize, false,
-      <<ExtRCode,Version,DO:1,Z:15>>, Data).
+      <<ExtRCode,Version,DO:1,Z:15>>, Data);
+encode_res_section(
+  Opcode, Bin, Comp,
+  [#dns_rr_tsig{
+      domain           = DName,
+      algname          = AlgName,
+      now              = Now,
+      fudge            = Fudge,
+      mac              = MAC,
+      original_id      = OriginalId,
+      error            = Error,
+      other_data       = OtherData}]) ->
+    Data = {AlgName,Now,Fudge,MAC,OriginalId,Error,OtherData},
+    encode_res_section_rr(
+      Opcode, Bin, Comp, [], DName, ?S_TSIG, ?S_ANY, false,
+      <<0:32/signed>>, Data).
 
 encode_res_section_rr(
   Opcode, Bin0, Comp0, Rs, DName, Type, Class, CacheFlush, TTL, Data) ->
@@ -399,6 +438,7 @@ decode_type(Type) ->
 	?T_UID -> ?S_UID;
 	?T_GID -> ?S_GID;
 	?T_UNSPEC -> ?S_UNSPEC;
+	?T_TSIG -> ?S_TSIG;
 	?T_IXFR -> ?S_IXFR;
 	?T_AXFR -> ?S_AXFR;
 	?T_MAILB -> ?S_MAILB;
@@ -441,6 +481,7 @@ encode_type(Type) ->
 	?S_UID -> ?T_UID;
 	?S_GID -> ?T_GID;
 	?S_UNSPEC -> ?T_UNSPEC;
+	?S_TSIG -> ?T_TSIG;
 	?S_IXFR -> ?T_IXFR;
 	?S_AXFR -> ?T_AXFR;
 	?S_MAILB -> ?T_MAILB;
@@ -833,6 +874,17 @@ encode_data(Comp, _, ?S_CAA, Data)->
         _ ->
             {encode_txt(Data),Comp}
     end;
+encode_data(Comp, _, ?S_TSIG, Data)->
+    {AlgName,Now,Fudge,MAC,OriginalId,Error,OtherData} = Data,
+    %% Bypass name compression (RFC 8945, section 4.2)
+    {AlgNameEncoded,_} = encode_name(gb_trees:empty(), 0, AlgName),
+    MACSize = byte_size(MAC),
+    OtherLen = byte_size(OtherData),
+    DataB = <<AlgNameEncoded/binary,
+	     Now:48, Fudge:16, MACSize:16, MAC:MACSize/binary,
+	     OriginalId:16, Error:16,
+	     OtherLen:16, OtherData:OtherLen/binary>>,
+    {DataB,Comp};
 %%
 %% sofar unknown or non standard
 encode_data(Comp, _Pos, Type, Data) when is_integer(Type) ->
@@ -972,3 +1024,35 @@ encode_loc_size(X)
     Multiplier = round(math:pow(10, Exponent)),
     Base = (X + Multiplier - 1) div Multiplier,
     <<Base:4, Exponent:4>>.
+
+decode_algname(AlgName) ->
+    case AlgName of
+        ?T_TSIG_HMAC_MD5 -> ?S_TSIG_HMAC_MD5;
+        ?T_TSIG_GSS_TSIG -> ?S_TSIG_GSS_TSIG;
+        ?T_TSIG_HMAC_SHA1 -> ?S_TSIG_HMAC_SHA1;
+        ?T_TSIG_HMAC_SHA1_96 -> ?S_TSIG_HMAC_SHA1_96;
+        ?T_TSIG_HMAC_SHA224 -> ?S_TSIG_HMAC_SHA224;
+        ?T_TSIG_HMAC_SHA256 -> ?S_TSIG_HMAC_SHA256;
+        ?T_TSIG_HMAC_SHA256_128 -> ?S_TSIG_HMAC_SHA256_128;
+        ?T_TSIG_HMAC_SHA384 -> ?S_TSIG_HMAC_SHA384;
+        ?T_TSIG_HMAC_SHA384_192 -> ?S_TSIG_HMAC_SHA384_192;
+        ?T_TSIG_HMAC_SHA512 -> ?S_TSIG_HMAC_SHA512;
+        ?T_TSIG_HMAC_SHA512_256 -> ?S_TSIG_HMAC_SHA512_256;
+       _ -> AlgName  % raw unknown algname
+    end.
+
+encode_algname(Alg) ->
+    case Alg of
+        ?S_TSIG_HMAC_MD5 -> ?T_TSIG_HMAC_MD5;
+        ?S_TSIG_GSS_TSIG -> ?T_TSIG_GSS_TSIG;
+        ?S_TSIG_HMAC_SHA1 -> ?T_TSIG_HMAC_SHA1;
+        ?S_TSIG_HMAC_SHA1_96 -> ?T_TSIG_HMAC_SHA1_96;
+        ?S_TSIG_HMAC_SHA224 -> ?T_TSIG_HMAC_SHA224;
+        ?S_TSIG_HMAC_SHA256 -> ?T_TSIG_HMAC_SHA256;
+        ?S_TSIG_HMAC_SHA256_128 -> ?T_TSIG_HMAC_SHA256_128;
+        ?S_TSIG_HMAC_SHA384 -> ?T_TSIG_HMAC_SHA384;
+        ?S_TSIG_HMAC_SHA384_192 -> ?T_TSIG_HMAC_SHA384_192;
+        ?S_TSIG_HMAC_SHA512 -> ?T_TSIG_HMAC_SHA512;
+        ?S_TSIG_HMAC_SHA512_256 -> ?T_TSIG_HMAC_SHA512_256;
+       Alg when is_list(Alg) -> Alg  % raw unknown algname
+    end.
diff --git a/lib/kernel/src/inet_dns.hrl b/lib/kernel/src/inet_dns.hrl
index 17151fbb6a..d3b5930b4c 100644
--- a/lib/kernel/src/inet_dns.hrl
+++ b/lib/kernel/src/inet_dns.hrl
@@ -45,6 +45,10 @@
 -define(NOTAUTH,  9).		%% server not authoritative for zone (DDNS)
 -define(NOTZONE,  10).		%% name not contained in zone (DDNS)
 -define(BADVERS,  16).		%% bad version EDNS pseudo-rr RFC6891: 6.1.3
+-define(BADSIG,   16).		%% TSIG Signature Failure (TSIG)
+-define(BADKEY,   17).		%% Key not recognized (TSIG)
+-define(BADTIME,  18).		%% Signature out of time window (TSIG)
+-define(BADTRUNC, 22).		%% Bad Truncation (TSIG)
 
 %%
 %% Type values for resources and queries
@@ -80,6 +84,7 @@
 -define(T_UID,		101).		%% user ID
 -define(T_GID,		102).		%% group ID
 -define(T_UNSPEC,	103).		%% Unspecified format (binary data)
+-define(T_TSIG,		250).		%% transaction signature
 -define(T_IXFR,		251).		%% incremental zone transfer
 -define(T_AXFR,		252).		%% zone transfer
 -define(T_MAILB,	253).		%% transfer mailbox records
@@ -124,6 +129,7 @@
 -define(S_UID,		uid).		%% user ID
 -define(S_GID,		gid).		%% group ID
 -define(S_UNSPEC,	unspec).        %% Unspecified format (binary data)
+-define(S_TSIG,		tsig).		%% transaction signature
 -define(S_IXFR,		ixfr).		%% incremental zone transfer
 -define(S_AXFR,		axfr).		%% zone transfer
 -define(S_MAILB,	mailb).		%% transfer mailbox records
@@ -143,6 +149,33 @@
 -define(C_NONE,		254).		%% for DDNS (RFC2136, section 2.4)
 -define(C_ANY,		255).		%% wildcard match
 
+%%
+%% TSIG Algorithms and Identifiers (RFC8945, section 6)
+%%
+-define(T_TSIG_HMAC_MD5,		"HMAC-MD5.SIG-ALG.REG.INT").
+-define(T_TSIG_GSS_TSIG,		"gss-tsig").
+-define(T_TSIG_HMAC_SHA1,		"hmac-sha1").
+-define(T_TSIG_HMAC_SHA1_96,		"hmac-sha1_96").
+-define(T_TSIG_HMAC_SHA224,		"hmac-sha224").
+-define(T_TSIG_HMAC_SHA256,		"hmac-sha256").
+-define(T_TSIG_HMAC_SHA256_128,		"hmac-sha256-128").
+-define(T_TSIG_HMAC_SHA384,		"hmac-sha384").
+-define(T_TSIG_HMAC_SHA384_192,		"hmac-sha384-192").
+-define(T_TSIG_HMAC_SHA512,		"hmac-sha512").
+-define(T_TSIG_HMAC_SHA512_256,		"hmac-sha512-256").
+% map mostly to crypto:hmac_hash_algorithm()
+-define(S_TSIG_HMAC_MD5,		md5).
+-define(S_TSIG_GSS_TSIG,		gss_tsig).
+-define(S_TSIG_HMAC_SHA1,		sha).
+-define(S_TSIG_HMAC_SHA1_96,		{sha,96}).
+-define(S_TSIG_HMAC_SHA224,		sha224).
+-define(S_TSIG_HMAC_SHA256,		sha256).
+-define(S_TSIG_HMAC_SHA256_128,		{sha256,128}).
+-define(S_TSIG_HMAC_SHA384,		sha384).
+-define(S_TSIG_HMAC_SHA384_192,		{sha384,192}).
+-define(S_TSIG_HMAC_SHA512,		sha512).
+-define(S_TSIG_HMAC_SHA512_256,		{sha512,256}).
+
 %%
 %% Structure for query header, the order of the fields is machine and
 %% compiler dependent, in our case, the bits within a byte are assignd
@@ -206,6 +239,21 @@
           do = false          %% RFC6891(6.1.3 DO)
 	 }).
 
+-record(dns_rr_tsig,          %% TSIG RR OPT (RFC8945), dns_rr{type=tsig}
+	{
+	  domain = "",        %% name of the key
+	  type = tsig,
+	  offset,             %% position of RR in packet
+	  %% RFC8945(4.2 TSIG Record Format)
+	  algname,
+	  now,
+	  fudge,
+	  mac,
+	  original_id = #dns_header{}#dns_header.id,
+	  error = #dns_header{}#dns_header.rcode,
+	  other_data = <<>>
+	 }).
+
 -record(dns_query,
 	{
 	 domain,                    %% query domain
diff --git a/lib/kernel/src/inet_dns_tsig.erl b/lib/kernel/src/inet_dns_tsig.erl
new file mode 100644
index 0000000000..46bd05b2b0
--- /dev/null
+++ b/lib/kernel/src/inet_dns_tsig.erl
@@ -0,0 +1,319 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 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%
+%%
+-module(inet_dns_tsig).
+
+%% DNS TSIG handling
+%%
+%% RFC 8945: Secret Key Transaction Authentication for DNS (TSIG)
+
+%% WARNING: in the spirit of inet_dns.erl, this module only handles the
+%% cryptographic operations and does not absolve you of your responsibities
+%% that include:
+%%  * implement a truncation policy as per RFC8945, section 5.2
+%%  * verifying that for TSIG over TCP the last message contains a TSIG RR
+%%  * truncated messages must include the TSIG RR as per RFC8945, section 5.3
+%%  * if running as a server, generate suitable error responses
+%%    as per RFC8945, section 5.2
+
+-export([init/1, sign/2, sign/3, verify/3]).
+
+-include("inet_dns.hrl").
+
+-define(FUDGE_DEFAULT, 300). % RFC8945, section 10
+-define(MAC_SIZE_MIN, 10). % RFC8945, section 5.2.2.1
+-define(TTL, 0).
+-define(NOW, (os:system_time(seconds))). % RFC8945, section 5.2.3
+
+-define(ALG_DEFAULT, sha256). % RFC8945, section 6
+-define(ALGS_SUPPORTED, [md5, sha, sha224, ?ALG_DEFAULT, sha384, sha512]).
+-type tsig_algs() :: md5 | sha | sha224 | ?ALG_DEFAULT | sha384 | sha512.
+-type tsig_alg()  :: {tsig_algs(),?MAC_SIZE_MIN..65535}.
+
+-type tsig_key()   :: {string(),iodata()}.
+-type tsig_error() :: ?BADSIG | ?BADKEY | ?BADTIME | ?BADTRUNC.
+
+-record(
+   tsig_state,
+   {key   = []                  :: tsig_key() | list(tsig_key()),
+    alg   = ?ALG_DEFAULT        :: tsig_alg(), % client only
+    fudge = ?FUDGE_DEFAULT      :: 0..65535,
+
+    qr    = 0                   :: 0..100,
+    %% 0 (false): request, 1+ (true): response
+    %% this value is overloaded to handle TSIG
+    %% over TCP where we need to accept up to
+    %% 99 messages without TSIG so each time a
+    %% response with a TSIG RR is received this
+    %% value is reset to 2
+
+    id                          :: undefined | 0..65535,
+    mac   = {?MODULE,undefined} ::
+      {?MODULE,undefined | binary()} | {crypto,crypto:mac_state()}
+}).
+-opaque tsig_state() :: #tsig_state{}.
+-export_type([tsig_state/0]).
+
+-spec init(proplists:proplist()) -> tsig_state().
+init(Config) ->
+    Key0 = proplists:get_value(keys, Config, []), % server passes in keys
+    Key = proplists:get_value(key, Config, Key0), % client passes in key
+    true = is_tuple(Key) orelse Key =/= [],
+    Alg = case proplists:get_value(alg, Config, ?ALG_DEFAULT) of
+        {A,S} when is_atom(A), is_integer(S) ->
+            true = lists:member(A, ?ALGS_SUPPORTED)
+                    andalso
+                   S >= ?MAC_SIZE_MIN
+                    andalso
+                   S >= maps:get(size, crypto:hash_info(A)) div 2,
+            {A,S};
+        A when is_atom(A) ->
+            true = lists:member(A, ?ALGS_SUPPORTED),
+            {A,maps:get(size, crypto:hash_info(A))}
+    end,
+    Fudge = proplists:get_value(fudge, Config, ?FUDGE_DEFAULT),
+    true = is_integer(Fudge) andalso Fudge >= 0 andalso Fudge =< 65535,
+    #tsig_state{ key = Key, alg = Alg, fudge = Fudge }.
+
+
+-spec sign(binary(), tsig_state()) -> {ok,binary(),tsig_state()}.
+sign(Pkt, TS) ->
+    sign(Pkt, TS, ?NOERROR).
+
+-spec sign(binary(), tsig_state(), tsig_error() | ?NOERROR) ->
+          {ok,binary(),tsig_state()}.
+sign(
+  Pkt = <<Hdr:10/binary, Rest/binary>>,
+  TS  = #tsig_state{ id = TSId, qr = TSQR },
+  Error) ->
+    case Hdr of
+        %% client uses this
+        <<Id:16, QR:1, _:15, _/binary>>
+          when QR == 0, TSId == undefined ->
+            sign(Pkt, TS#tsig_state{ id = Id }, Error, Hdr, Rest);
+        %%
+        %% client and server use this
+        <<_Id:16, QR:1, _:15, _/binary>>
+          when QR == 0, TSQR == 0;
+               QR == 1, TSQR >= 1 ->
+            sign(Pkt, TS, Error, Hdr, Rest)
+    end.
+
+sign(Pkt, TS, Error, Hdr, <<ARCount:16, Content/binary>>) ->
+    {Name,_Secret} = TS#tsig_state.key,
+    {Alg,_MACSize} = TS#tsig_state.alg,
+    Now = ?NOW,
+    OtherData = otherdata(Error, Now),
+    MAC = mac(Pkt, TS, Error, Now, OtherData),
+    TSigRR =
+        #dns_rr_tsig{
+           domain = Name,
+           algname = inet_dns:encode_algname(Alg),
+           now = Now,
+           fudge = TS#tsig_state.fudge,
+           mac = MAC,
+           original_id = TS#tsig_state.id,
+           error = Error,
+           other_data = OtherData},
+    %% for simplicity, and to avoid export hell, we encode a skeleton packet and
+    %% extract our TSIG RR directly from it
+    <<_:12/binary, TSigRRBin/binary>> =
+        inet_dns:encode(
+          #dns_rec{ header = #dns_header{}, arlist = [TSigRR]}),
+    TSQR = TS#tsig_state.qr,
+    {ok,
+     <<Hdr/binary, (ARCount + 1):16, Content/binary, TSigRRBin/binary>>,
+     TS#tsig_state{ qr = TSQR + 1, mac = {?MODULE,MAC} }}.
+
+
+%% this function needs to work with the original response binary as the MAC
+%% calculation is affected by each DNS implementation having their own varying
+%% name compression algorithm
+-spec verify(binary(), #dns_rec{}, tsig_state()) ->
+                 {ok,tsig_state()} |
+                 {error,formerr | {notauth,badkey | badsig | badtime}}.
+verify(Pkt, Response, TS) ->
+    try do_verify(Pkt, Response, TS) of
+        R ->
+            R
+    catch
+        Reason ->
+            {error,Reason}
+    end.
+
+%% server uses this
+do_verify(Pkt,
+          Response = #dns_rec{
+                         header = #dns_header{ qr = QR },
+                         arlist = ARList },
+          TS0 = #tsig_state{ id = TSId })
+              when QR == false, TSId == undefined ->
+    ARList == [] andalso throw({noauth,badsig}),
+    #dns_rr_tsig{
+        domain = Name,
+        algname = AlgName,
+        mac = MAC,
+        original_id = OriginalId,
+        error = Error
+    } = lists:last(ARList),
+    Key = lists:keyfind(Name, 1, TS0#tsig_state.key),
+    Key == false andalso throw({notauth,badkey}),
+    {Alg,AlgSize} = case inet_dns:decode_algname(AlgName) of
+        {A,S} ->
+            {A,S};
+        A ->
+            {A,maps:get(size, crypto:hash_info(A))}
+    end,
+    %% RFC8945, section 5.2.2.1: MAC Truncation
+    MACSize = if
+        Error == ?BADSIG; Error == ?BADKEY ->
+            AlgSize;
+        true ->
+            byte_size(MAC)
+    end,
+    lists:member(Alg, ?ALGS_SUPPORTED) orelse throw({notauth,badkey}),
+    MACValid = MACSize >= ?MAC_SIZE_MIN
+                andalso
+               MACSize >= AlgSize div 2
+                andalso
+               MACSize =< AlgSize,
+    MACValid orelse throw(formerr),
+    TS = TS0#tsig_state{ alg = {Alg,AlgSize}, key = Key, id = OriginalId },
+    do_verify(Pkt, Response, TS);
+%%
+%% client and server use this
+do_verify(Pkt = <<_Id:16, QR:1, _:15, _/binary>>,
+          Response = #dns_rec{ arlist = ARList },
+          TS = #tsig_state{ qr = TSQR })
+              when QR == TSQR; QR == 1 andalso TSQR >= 2 ->
+    case ARList =/= [] andalso lists:last(ARList) of
+        %% RFC8945, section 5.3.1: TSIG on TCP Connections
+        false when TSQR == 3 -> % not 2 as we must start with a TSIG RR
+            MAC0 = mac0(TS),
+            %% TS#tsig_state.mac is {?MODULE,binary()} (Previous MAC)
+            MACN0 = macN(TS#tsig_state.mac, TS#tsig_state{ mac = MAC0 }),
+            MACN = macN(Pkt, TS#tsig_state{ mac = MACN0 }),
+            {ok,TS#tsig_state{ qr = TSQR + 1, mac = MACN }};
+        false when TSQR >= 4, TSQR =< 99 ->
+            MACN = macN(Pkt, TS),
+            {ok,TS#tsig_state{ qr = TSQR + 1, mac = MACN }};
+        TSigRR = #dns_rr_tsig{} ->
+            do_verify(Pkt, Response, TS, TSigRR);
+        false ->
+            {error,{notauth,badsig}}
+    end.
+
+do_verify(Pkt, _Response, TS, TSigRR) ->
+    Now = ?NOW,
+    #dns_rr_tsig{
+        offset = Offset,
+        now = NowSigned,
+        fudge = Fudge,
+        mac = MAC,
+        error = Error,
+        other_data = OtherData
+    } = TSigRR,
+    PktS = iolist_to_binary([
+        <<(TS#tsig_state.id):16>>,
+        binary:part(Pkt, {2,8}),
+        begin
+            <<ARC:16>> = binary:part(Pkt, {10,2}),
+            <<(ARC - 1):16>>
+        end,
+        binary:part(Pkt, {12,Offset - 12})
+    ]),
+    MACCalc = if
+        element(1, TS#tsig_state.mac) == ?MODULE ->
+            mac(PktS, TS, Error, Now, OtherData);
+        %% RFC8945, section 5.3.1: TSIG on TCP Connections
+        true ->
+            mac(TS, Error, Now, OtherData)
+    end,
+    if
+        %% RFC8945, section 5.2 - MUST check time after MAC
+        MAC == MACCalc, NowSigned - Fudge < Now, NowSigned + Fudge > Now ->
+            QR = if TS#tsig_state.qr == 0 -> 1; true -> 2 end,
+            {ok,TS#tsig_state{ qr = QR, mac = {?MODULE,MAC} }};
+        MAC == MACCalc ->
+            {error,{notauth,badtime}};
+        true ->
+            {error,{notauth,badsig}}
+    end.
+
+%% similar to inet_dns:encode_name/3 but without compression
+encode_name(Name) ->
+    iolist_to_binary([
+        [ <<(byte_size(L)):8, L/binary>>
+            || L <- binary:split(list_to_binary(Name), <<".">>, [global]) ],
+        <<0:8>>
+    ]).
+
+otherdata(?BADTIME, Now) -> <<Now:48>>;
+otherdata(_Error, _Now) -> <<>>.
+
+mac0(TS = #tsig_state{ mac = {?MODULE,MAC} }) ->
+    {_Name,Secret} = TS#tsig_state.key,
+    {Alg,_MACSize} = TS#tsig_state.alg,
+    MACState = crypto:mac_init(hmac, Alg, Secret),
+    {crypto,if
+        %% RFC8945, section 5.3.1: TSIG on TCP Connections
+        is_binary(MAC) ->
+            MS = byte_size(MAC),
+            crypto:mac_update(MACState, [<<MS:16>>, MAC]);
+        true ->
+            MACState
+    end}.
+
+macN({?MODULE,MAC}, #tsig_state{ mac = {crypto,MACState} }) ->
+    {crypto,crypto:mac_update(MACState, MAC)};
+macN(Pkt, TS = #tsig_state{ mac = {crypto,MACState} }) ->
+    {crypto,crypto:mac_update(MACState, [
+       <<(TS#tsig_state.id):16>>,
+       binary:part(Pkt, {2,byte_size(Pkt) - 2})
+    ])}.
+
+%% RFC8945, section 5.3.2: Generation of TSIG on Error Returns
+mac(_TS, Error, _Now, _OtherData)
+  when Error == ?BADSIG; Error == ?BADKEY ->
+    <<>>;
+mac(TS = #tsig_state{ mac = {crypto,MACState0} }, Error, Now, OtherData) ->
+    {Name,_Secret} = TS#tsig_state.key,
+    {Alg,MACSize} = TS#tsig_state.alg,
+    Fudge = TS#tsig_state.fudge,
+    OtherLen = byte_size(OtherData),
+    MACState = crypto:mac_update(MACState0, if
+        TS#tsig_state.qr =< 1 ->
+            [
+                %% TSIG RR
+                encode_name(Name), <<?C_ANY:16>>, <<?TTL:32/signed>>,
+                %% TSIG RDATA
+                encode_name(inet_dns:encode_algname(Alg)),
+                <<Now:48, Fudge:16, Error:16, OtherLen:16>>,
+                OtherData
+            ];
+        %% RFC8945, section 5.3.1: TSIG on TCP Connections
+        true ->
+            <<Now:48, Fudge:16>>
+    end),
+    crypto:mac_finalN(MACState, MACSize).
+
+mac(Pkt, TS, Error, Now, OtherData) ->
+    MAC0 = mac0(TS),
+    MACN = macN(Pkt, TS#tsig_state{ mac = MAC0 }),
+    mac(TS#tsig_state{ mac = MACN }, Error, Now, OtherData).
diff --git a/lib/kernel/src/inet_res.erl b/lib/kernel/src/inet_res.erl
index f0d2f21364..091ebef91c 100644
--- a/lib/kernel/src/inet_res.erl
+++ b/lib/kernel/src/inet_res.erl
@@ -1094,11 +1094,16 @@ decode_answer(Answer, Q_Msg, Verbose) ->
     case inet_dns:decode(Answer) of
 	{ok, #dns_rec{header = H, arlist = ARList} = Msg} ->
 	    ?verbose(Verbose, "Got reply: ~p~n", [dns_msg(Msg)]),
+	    T = case lists:keyfind(dns_rr_tsig, 1, ARList) of
+		    false -> false;
+		    #dns_rr_tsig{error=?NOERROR} -> false;
+		    #dns_rr_tsig{error=TsigError} -> TsigError
+		end,
 	    E = case lists:keyfind(dns_rr_opt, 1, ARList) of
 		    false -> 0;
 		    #dns_rr_opt{ext_rcode=ExtRCode} -> ExtRCode
 		end,
-	    RCode = (E bsl 4) bor H#dns_header.rcode,
+	    RCode = T orelse (E bsl 4) bor H#dns_header.rcode,
 	    case RCode of
 		?NOERROR  -> decode_answer_noerror(Q_Msg, Msg, H);
 		?FORMERR  -> {error,{qfmterror,Msg}};
@@ -1111,7 +1116,11 @@ decode_answer(Answer, Q_Msg, Verbose) ->
 		?NXRRSET  -> {error,{nxrrset,Msg}};
 		?NOTAUTH  -> {error,{noauth,Msg}};
 		?NOTZONE  -> {error,{nozone,Msg}};
-		?BADVERS  -> {error,{badvers,Msg}};
+		?BADVERS when not T -> {error,{badvers,Msg}};
+		?BADSIG   -> {error,{badsig,Msg}};
+		?BADKEY   -> {error,{badkey,Msg}};
+		?BADTIME  -> {error,{badtime,Msg}};
+		?BADTRUNC -> {error,{badtrunc,Msg}};
 		_         -> {error,{unknown,Msg}}
 	    end;
 	{error, formerr} = Error ->
diff --git a/lib/kernel/src/kernel.app.src b/lib/kernel/src/kernel.app.src
index 10705d9d76..4ae0fb6bb5 100644
--- a/lib/kernel/src/kernel.app.src
+++ b/lib/kernel/src/kernel.app.src
@@ -104,6 +104,7 @@
              inet,
              inet_db,
              inet_dns,
+             inet_dns_tsig,
              inet_parse,
              inet_res,
              inet_tcp,
diff --git a/lib/kernel/test/inet_res_SUITE.erl b/lib/kernel/test/inet_res_SUITE.erl
index c69cf934ce..045fdcc83b 100644
--- a/lib/kernel/test/inet_res_SUITE.erl
+++ b/lib/kernel/test/inet_res_SUITE.erl
@@ -35,7 +35,7 @@
          edns0/1, edns0_multi_formerr/1, txt_record/1, files_monitor/1,
 	 nxdomain_reply/1, last_ms_answer/1, intermediate_error/1,
          servfail_retry_timeout_default/1, servfail_retry_timeout_1000/1,
-         label_compression_limit/1, update/1
+         label_compression_limit/1, update/1, tsig_client/1, tsig_server/1
         ]).
 -export([
 	 gethostbyaddr/0, gethostbyaddr/1,
@@ -77,7 +77,7 @@ all() ->
      nxdomain_reply, last_ms_answer,
      intermediate_error,
      servfail_retry_timeout_default, servfail_retry_timeout_1000,
-     label_compression_limit, update,
+     label_compression_limit, update, tsig_client, tsig_server,
      gethostbyaddr, gethostbyaddr_v6, gethostbyname,
      gethostbyname_v6, getaddr, getaddr_v6, ipv4_to_ipv6,
      host_and_addr].
@@ -134,6 +134,7 @@ zone_dir(TC) ->
 	nxdomain_reply       -> otptest;
 	last_ms_answer       -> otptest;
 	update               -> otptest;
+	tsig_client          -> otptest;
         intermediate_error   ->
             {internal,
              #{rcode => ?REFUSED}};
@@ -1470,6 +1471,196 @@ update(Config) when is_list(Config) ->
     ok.
 
 
+%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Tests for TSIG
+
+% note for implementors reading this, the usage of
+% inet_dns_tsig.erl is identical except you do not need
+% to inspect the reponse for the presence of a TSIG RR
+tsig_client(Config) when is_list(Config) ->
+    {NSIP,NSPort} = ns(Config),
+    Domain = "otptest",
+    Request = #dns_rec{
+        header = #dns_header{},
+        qdlist = [#dns_query{ domain = Domain, class = in, type = axfr }]
+    },
+    Pkt = inet_dns:encode(Request),
+
+    Key = {"testkey","ded5ada3-07f2-42b9-84bf-82d30f6795ee"},
+    TS0 = inet_dns_tsig:init([{key,Key}]),
+    {ok,PktS,TS1} = inet_dns_tsig:sign(Pkt, TS0),
+
+    SockOpts = [binary,{active,false},{nodelay,true},{packet,2}],
+    {ok,Sock} = gen_tcp:connect(NSIP, NSPort, SockOpts),
+    ok = gen_tcp:send(Sock, PktS),
+    ok = gen_tcp:shutdown(Sock, write),
+    Recv = fun(Recv, A) ->
+        case gen_tcp:recv(Sock, 0) of
+            {ok,P} ->
+                Recv(Recv, [P|A]);
+            {error,closed} ->
+                lists:reverse(A)
+        end
+    end,
+    PktR = Recv(Recv, []),
+    ok = gen_tcp:close(Sock),
+
+    true = PktR =/= [],
+
+    {_TS,Response} = lists:foldl(fun(P, {T0,R0}) ->
+        {ok,R} = inet_dns:decode(P),
+        {ok,T} = inet_dns_tsig:verify(P, R, T0),
+        {T,R0 ++ [R]}
+    end, {TS1,[]}, PktR),
+
+    % not necessary for the test, but helpful to those using this
+    % to understand how to validate TCP responses, we need to check
+    % that the last message has a TSIG RR (RRC8945, section 5.3.1)
+    % N.B. unnecessary for UDP as handled by inet_dns_tsig:verify()
+    #dns_rec{ arlist = ARList } = lists:last(Response),
+    true = ARList =/= [],
+    #dns_rr_tsig{} = lists:last(ARList),
+
+    % actual implementations would here now consider if the additional
+    % checks described in the WARNING at the top of inet_dns_tsig.erl
+    % are applicable to their use case and if so implement them
+    ok.
+
+tsig_server(Config) when is_list(Config) ->
+    case os:find_executable("dig") of
+        false ->
+            case os:find_executable("drill") of
+                false ->
+                    {skip, "Cannot find executable: dig|drill"};
+                Drill ->
+                    tsig_server(Config, Drill)
+            end;
+        Dig ->
+            tsig_server(Config, Dig)
+    end.
+%%
+tsig_server(_Config, DigDrill) ->
+    Domain = "otptest",
+
+    Key = {"testkey","b0b8006a-04ad-4a96-841a-a4eae78011a1"},
+    Keys0 = [Key,{"grease0",""},{"grease1",""},{"grease2",""}],
+    Rand = [ rand:uniform() || _ <- lists:seq(1, length(Keys0)) ],
+    {_,Keys} = lists:unzip(lists:keysort(1, lists:zip(Rand, Keys0))),
+    TS0 = inet_dns_tsig:init([{keys,Keys}]),
+
+    SockOpts = [binary,{active,false},{nodelay,true},{packet,2}],
+    {ok,LSock} = gen_tcp:listen(0, [{ip,{127,0,0,1}}|SockOpts]),
+    {ok,LPort} = inet:port(LSock),
+
+    _ = process_flag(trap_exit, true),
+    {_, MRef} =
+        spawn_opt(
+          fun() ->
+                  KeyName = element(1, Key),
+                  KeySecret = base64:encode_to_string(element(2, Key)),
+                  Command = DigDrill ++
+                      " -p " ++ integer_to_list(LPort) ++
+                      " -y hmac-sha256:" ++ KeyName ++ ":" ++ KeySecret ++
+                      " " ++ Domain ++ ". @127.0.0.1 AXFR IN",
+                  Opts = [in,eof,exit_status,stderr_to_stdout,hide],
+                  Port = erlang:open_port({spawn,Command}, Opts),
+                  Collect =
+                      fun C(A) ->
+                              receive
+                                  {Port,{data,B}} ->
+                                      C([B|A]);
+                                  {Port,eof} ->
+                                      C(A);
+                                  {Port,{exit_status,Status}} ->
+                                      {ok,{Status,lists:reverse(A)}};
+                                  {Port,closed} ->
+                                      {error,closed}
+                              after 1000 ->
+                                      {error,timeout}
+                              end
+                      end,
+                  ClientResult = Collect([]),
+                  true = erlang:port_close(Port),
+                  exit({done,ClientResult})
+          end, [link,monitor]),
+
+    Result =
+        case gen_tcp:accept(LSock, 5000) of
+            {ok,Sock} ->
+                try
+                    ok = gen_tcp:close(LSock),
+                    tsig_server(Domain, TS0, Sock)
+                of
+                    _ ->
+                        gen_tcp:close(Sock)
+                catch
+                    Class : Reason : Stacktrace ->
+                        _ = catch gen_tcp:close(Sock),
+                        {Class,Reason,Stacktrace}
+                end;
+            Error ->
+                _ = catch gen_tcp:close(LSock),
+                Error
+        end,
+
+    receive
+        {'DOWN',MRef,_,_,{done,{ok,{Code,Output}}}} ->
+            ?P("Output of ~s (exit code ~B):~n~s~n",
+               [DigDrill, Code, Output]),
+            {0,ok} = {Code,Result};
+        {'DOWN',MRef,_,_,CError} ->
+            error({CError,Result})
+    after 1000 ->
+            error({timeout,Result})
+    end.
+
+tsig_server(Domain, TS0, Sock) ->
+    SOAData = {"ns","lsa.soa",1,60,10,300,30},
+    SOA = #dns_rr{ domain = Domain, class = in, type = soa, data = SOAData },
+    PadData = ["0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"],
+    Padding = #dns_rr{ class = in, type = txt, data = PadData },
+
+    {ok,Pkt} = gen_tcp:recv(Sock, 0),
+    ok = gen_tcp:shutdown(Sock, read),
+
+    {ok,Request} = inet_dns:decode(Pkt),
+    {ok,TS1} = inet_dns_tsig:verify(Pkt, Request, TS0),
+
+    % actual implementations would here now consider if the additional
+    % checks described in the WARNING at the top of inet_dns_tsig.erl
+    % are applicable to their use case and if so implement them
+
+    PktR0 = #dns_rec{
+        header = #dns_header{
+            id = Request#dns_rec.header#dns_header.id,
+            qr = true
+        },
+        qdlist = Request#dns_rec.qdlist
+    },
+
+    Format = "~2.10.0B.padding." ++ Domain,
+    AnList1 = [SOA] ++ [ Padding#dns_rr{
+                    domain = io_lib:format(Format, [X]) } ||
+                  X <- lists:seq(0, 9) ],
+    PktR1 = inet_dns:encode(PktR0#dns_rec{ anlist = AnList1 }),
+    {ok,PktR1S,TS2} = inet_dns_tsig:sign(PktR1, TS1),
+    ok = gen_tcp:send(Sock, PktR1S),
+
+    AnList2 = [ Padding#dns_rr{
+                    domain = io_lib:format(Format, [X]) } ||
+                  X <- lists:seq(10, 19) ],
+    PktR2 = inet_dns:encode(PktR0#dns_rec{ anlist = AnList2 }),
+    {ok,PktR2S,TS3} = inet_dns_tsig:sign(PktR2, TS2),
+    ok = gen_tcp:send(Sock, PktR2S),
+
+    AnList3 = [ Padding#dns_rr{
+                    domain = io_lib:format(Format, [X]) } ||
+                  X <- lists:seq(20, 29) ] ++ [SOA],
+    PktR3 = inet_dns:encode(PktR0#dns_rec{ anlist = AnList3 }),
+    {ok,PktR3S,_TS} = inet_dns_tsig:sign(PktR3, TS3),
+    ok = gen_tcp:send(Sock, PktR3S).
+
+
 %% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %% Compatibility tests. Call the inet_SUITE tests, but with
 %% lookup = [file,dns] instead of [native]
diff --git a/lib/kernel/test/inet_res_SUITE_data/otptest/knot_inc.conf b/lib/kernel/test/inet_res_SUITE_data/otptest/knot_inc.conf
index 50c9f0d977..91a48f62bf 100644
--- a/lib/kernel/test/inet_res_SUITE_data/otptest/knot_inc.conf
+++ b/lib/kernel/test/inet_res_SUITE_data/otptest/knot_inc.conf
@@ -1,10 +1,21 @@
+key:
+  - id: testkey.otptest
+    algorithm: hmac-sha256
+    # ded5ada3-07f2-42b9-84bf-82d30f6795ee
+    secret: ZGVkNWFkYTMtMDdmMi00MmI5LTg0YmYtODJkMzBmNjc5NWVl
+
 acl:
   - id: update_rule
     address: 127.0.0.1
     action: update
 
+acl:
+  - id: testkey_rule
+    key: testkey.otptest
+    action: transfer
+
 zone:
   - domain: otptest
-    acl: [ update_rule ]
+    acl: [ update_rule, testkey_rule ]
   - domain: 0.0.127.in-addr.arpa.
   - domain: 0.0.0.0.f.7.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa.
diff --git a/lib/kernel/test/inet_res_SUITE_data/otptest/otptest.zone b/lib/kernel/test/inet_res_SUITE_data/otptest/otptest.zone
index e94866a1f9..dc004896cb 100644
--- a/lib/kernel/test/inet_res_SUITE_data/otptest/otptest.zone
+++ b/lib/kernel/test/inet_res_SUITE_data/otptest/otptest.zone
@@ -61,3 +61,510 @@ minfo.resolve	IN MINFO	minfo-owner.resolve minfo-bounce.resolve
 uri.resolve     IN TYPE256	\# 21 000a 0003 (68747470 3a2f2f 65726c616e67 2e 6f7267)
 ;caa.resolve     IN CAA          1 iodef "http://iodef.erlang.org"
 caa.resolve     IN TYPE257       \# 30 01 (05 696f646566) (68747470 3a2f2f 696f646566 2e 65726c616e67 2e 6f7267)
+
+; for testing TSIG we need a multi-message response so we use AXFR but need
+; to juice up the zone file to meet our needs, the following creates 3 messages
+;
+; N.B. knotd does not support $GENERATE so here we go...
+;
+;$GENERATE 0-599 ${0,3,d} $.padding TXT "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+000.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+001.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+002.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+003.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+004.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+005.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+006.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+007.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+008.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+009.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+010.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+011.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+012.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+013.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+014.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+015.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+016.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+017.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+018.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+019.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+020.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+021.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+022.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+023.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+024.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+025.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+026.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+027.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+028.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+029.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+030.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+031.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+032.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+033.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+034.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+035.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+036.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+037.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+038.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+039.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+040.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+041.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+042.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+043.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+044.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
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+481.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
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+483.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+484.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+485.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+486.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+487.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+488.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
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+490.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
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+495.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+496.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+497.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+498.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+499.padding      IN TXT          "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
-- 
2.35.3

Places

File 6580-inet_dns-support-TSIG.patch of Package erlang (Revision c4d0cccff3408fb870c23d419a1f7548)

Places