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-rw-r--r--lib/diameter/include/diameter_gen.hrl102
-rw-r--r--lib/diameter/src/base/diameter_codec.erl3
2 files changed, 69 insertions, 36 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});