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-rw-r--r--lib/diameter/include/diameter_gen.hrl102
-rw-r--r--lib/diameter/src/base/diameter_codec.erl3
-rw-r--r--lib/diameter/test/diameter_traffic_SUITE.erl35
3 files changed, 96 insertions, 44 deletions
diff --git a/lib/diameter/include/diameter_gen.hrl b/lib/diameter/include/diameter_gen.hrl
index ebc10b8918..7e91ce375f 100644
--- a/lib/diameter/include/diameter_gen.hrl
+++ b/lib/diameter/include/diameter_gen.hrl
@@ -30,6 +30,10 @@
%% error or not. See is_strict/0.
-define(STRICT_KEY, strict).
+%% Key that says whether or not we should do a best-effort decode
+%% within Failed-AVP.
+-define(FAILED_KEY, failed).
+
-type parent_name() :: atom(). %% parent = Message or AVP
-type parent_record() :: tuple(). %%
-type avp_name() :: atom().
@@ -286,15 +290,7 @@ decode(Name, 'AVP', Avp, Acc) ->
%% d/3
-%% Don't try to decode the value of a Failed-AVP component since it
-%% probably won't. Note that matching on 'Failed-AVP' assumes that
-%% this is the RFC AVP, with code 279. Strictly, this doesn't need to
-%% be the case, so we're assuming no one defines another Failed-AVP.
-d('Failed-AVP' = Name, Avp, Acc) ->
- decode_AVP(Name, Avp, Acc);
-
-%% Or try to decode.
-d(Name, Avp, {Avps, Acc}) ->
+d(Name, Avp, Acc) ->
#diameter_avp{name = AvpName,
data = Data,
type = Type,
@@ -307,53 +303,81 @@ d(Name, Avp, {Avps, Acc}) ->
%% value around through the entire decode. The solution here is
%% simple in comparison, both to implement and to understand.
- Reset = relax(Type, M),
+ Strict = relax(Type, M),
+ %% Use the process dictionary again to keep track of whether we're
+ %% decoding within Failed-AVP and should ignore decode errors
+ %% altogether.
+
+ Failed = relax(Name), %% Not AvpName or else a failed Failed-AVP
+ %% decode is packed into 'AVP'.
try avp(decode, Data, AvpName) of
V ->
+ {Avps, T} = Acc,
{H, A} = ungroup(V, Avp),
- {[H | Avps], pack_avp(Name, A, Acc)}
+ {[H | Avps], pack_avp(Name, A, T)}
catch
error: Reason ->
- %% Failures here won't be visible since they're a "normal"
- %% occurrence if the peer sends a faulty AVP that we need to
- %% respond sensibly to. Log the occurence for traceability,
- %% but the peer will also receive info in the resulting
- %% answer-message.
- Stack = diameter_lib:get_stacktrace(),
- diameter_lib:log(decode_error,
- ?MODULE,
- ?LINE,
- {Reason, AvpName, Stack}),
-
- {Rec, Failed} = Acc,
- {[Avp|Avps], {Rec, [rc(Reason, Avp) | Failed]}}
+ d(undefined == Failed orelse is_failed(), Reason, Name, Avp, Acc)
after
- relax(Reset)
+ reset(?STRICT_KEY, Strict),
+ reset(?FAILED_KEY, Failed)
end.
+%% Ignore a decode error within Failed-AVP ...
+d(true, _, Name, Avp, Acc) ->
+ decode_AVP(Name, Avp, Acc);
+
+%% ... or not. Failures here won't be visible since they're a "normal"
+%% occurrence if the peer sends a faulty AVP that we need to respond
+%% sensibly to. Log the occurence for traceability, but the peer will
+%% also receive info in the resulting answer message.
+d(false, Reason, Name, Avp, {Avps, Acc}) ->
+ Stack = diameter_lib:get_stacktrace(),
+ diameter_lib:log(decode_error,
+ ?MODULE,
+ ?LINE,
+ {Reason, Name, Avp#diameter_avp.name, Stack}),
+ {Rec, Failed} = Acc,
+ {[Avp|Avps], {Rec, [rc(Reason, Avp) | Failed]}}.
+
%% Set false in the process dictionary as soon as we see a Grouped AVP
%% that doesn't set the M-bit, so that is_strict() can say whether or
%% not to ignore the M-bit on an encapsulated AVP.
relax('Grouped', M) ->
- V = getr(?STRICT_KEY),
- if V == undefined andalso not M ->
+ case getr(?STRICT_KEY) of
+ undefined when not M ->
putr(?STRICT_KEY, M);
- true ->
+ _ ->
false
end;
relax(_, _) ->
false.
-%% Reset strictness.
-relax(undefined) ->
- eraser(?STRICT_KEY);
-relax(false) ->
- ok.
-
is_strict() ->
false /= getr(?STRICT_KEY).
+%% Set true in the process dictionary as soon as we see Failed-AVP.
+%% Matching on 'Failed-AVP' assumes that this is the RFC AVP.
+%% Strictly, this doesn't need to be the case.
+relax('Failed-AVP') ->
+ case getr(?FAILED_KEY) of
+ undefined ->
+ putr(?FAILED_KEY, true);
+ true = Yes ->
+ Yes
+ end;
+relax(_) ->
+ is_failed().
+
+is_failed() ->
+ true == getr(?FAILED_KEY).
+
+reset(Key, undefined) ->
+ eraser(Key);
+reset(_, _) ->
+ ok.
+
%% decode_AVP/3
%%
%% Don't know this AVP: see if it can be packed in an 'AVP' field
@@ -441,7 +465,15 @@ pack_AVP(Name, #diameter_avp{is_mandatory = M} = Avp, Acc) ->
%% Give Failed-AVP special treatment since it'll contain any
%% unrecognized mandatory AVP's.
pack_arity(Name, M) ->
- case Name /= 'Failed-AVP' andalso M andalso is_strict() of
+ NF = Name /= 'Failed-AVP' andalso not is_failed(),
+ %% Not testing just Name /= 'Failed-AVP' means we're changing the
+ %% packing of AVPs nested within Failed-AVP, but the point of
+ %% ignoring errors within Failed-AVP is to decode as much as
+ %% possible, and failing because a mandatory AVP couldn't be
+ %% packed into a dedicated field defeats that point. Note that we
+ %% can't just test not is_failed() since this will be 'true' when
+ %% packing an unknown AVP directly within Failed-AVP.
+ case NF andalso M andalso is_strict() of
true ->
0;
false ->
diff --git a/lib/diameter/src/base/diameter_codec.erl b/lib/diameter/src/base/diameter_codec.erl
index 0ca4a84d21..06a4f5de64 100644
--- a/lib/diameter/src/base/diameter_codec.erl
+++ b/lib/diameter/src/base/diameter_codec.erl
@@ -593,7 +593,8 @@ pack_avp(#diameter_avp{code = undefined, data = B})
Len = size(<<H:5/binary, _:24, T/binary>> = <<B/binary, 0:Pad>>),
<<H/binary, Len:24, T/binary>>;
-%% ... from a dictionary compiled against old code (diameter_gen) ...
+%% ... from a dictionary compiled against old code in diameter_gen ...
+%% ... when ignoring errors in Failed-AVP ...
pack_avp(#diameter_avp{data = <<0:1, B/binary>>} = A) ->
pack_avp(A#diameter_avp{data = B});
diff --git a/lib/diameter/test/diameter_traffic_SUITE.erl b/lib/diameter/test/diameter_traffic_SUITE.erl
index 89592f02ef..4b67372016 100644
--- a/lib/diameter/test/diameter_traffic_SUITE.erl
+++ b/lib/diameter/test/diameter_traffic_SUITE.erl
@@ -56,7 +56,8 @@
send_zero_avp_length/1,
send_invalid_avp_length/1,
send_invalid_reject/1,
- send_unrecognized_mandatory/1,
+ send_unexpected_mandatory_decode/1,
+ send_unexpected_mandatory/1,
send_long/1,
send_nopeer/1,
send_noapp/1,
@@ -281,7 +282,8 @@ tc() ->
send_zero_avp_length,
send_invalid_avp_length,
send_invalid_reject,
- send_unrecognized_mandatory,
+ send_unexpected_mandatory_decode,
+ send_unexpected_mandatory,
send_long,
send_nopeer,
send_noapp,
@@ -488,6 +490,22 @@ send_unknown_mandatory(Config) ->
send_unknown_short_mandatory(Config) ->
send_unknown_short(Config, true, ?INVALID_AVP_LENGTH).
+%% Send an ACR containing an unexpected mandatory Session-Timeout.
+%% Expect 5001, and check that the value in Failed-AVP was decoded.
+send_unexpected_mandatory_decode(Config) ->
+ Req = ['ASR', {'AVP', [#diameter_avp{code = 27, %% Session-Timeout
+ is_mandatory = true,
+ data = <<12:32>>}]}],
+ ['ASA', _SessionId, {'Result-Code', ?AVP_UNSUPPORTED} | Avps]
+ = call(Config, Req),
+ [#'diameter_base_Failed-AVP'{'AVP' = As}]
+ = proplists:get_value('Failed-AVP', Avps),
+ [#diameter_avp{code = 27,
+ is_mandatory = true,
+ value = 12,
+ data = <<12:32>>}]
+ = As.
+
%% Send an STR that the server ignores.
send_noreply(Config) ->
Req = ['STR', {'Termination-Cause', ?BAD_ANSWER}],
@@ -554,9 +572,9 @@ send_invalid_reject(Config) ->
?answer_message(?TOO_BUSY)
= call(Config, Req).
-%% Send an STR containing a known AVP, but one that's not allowed and
-%% sets the M-bit.
-send_unrecognized_mandatory(Config) ->
+%% Send an STR containing a known AVP, but one that's not expected and
+%% that sets the M-bit.
+send_unexpected_mandatory(Config) ->
Req = ['STR', {'Termination-Cause', ?LOGOUT}],
['STA', _SessionId, {'Result-Code', ?AVP_UNSUPPORTED} | _]
@@ -923,8 +941,8 @@ prepare(Pkt, Caps, N, #group{client_dict0 = Dict0} = Group)
<<V, L:24, H/binary>> = H0, %% assert
E#diameter_packet{bin = <<V, (L+4):24, H/binary, 16:24, 0:32, T/binary>>};
-prepare(Pkt, Caps, send_unrecognized_mandatory, #group{client_dict0 = Dict0}
- = Group) ->
+prepare(Pkt, Caps, send_unexpected_mandatory, #group{client_dict0 = Dict0}
+ = Group) ->
Req = prepare(Pkt, Caps, Group),
#diameter_packet{bin = <<V, Len:24, T/binary>>}
= E
@@ -1045,7 +1063,8 @@ answer(Rec, [_|_], N)
N == send_zero_avp_length;
N == send_invalid_avp_length;
N == send_invalid_reject;
- N == send_unknown_short_mandatory ->
+ N == send_unknown_short_mandatory;
+ N == send_unexpected_mandatory_decode ->
Rec;
answer(Rec, [], _) ->
Rec.
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 20:13:48 +0000