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-rw-r--r--lib/diameter/include/diameter_gen.hrl88
1 files changed, 68 insertions, 20 deletions
diff --git a/lib/diameter/include/diameter_gen.hrl b/lib/diameter/include/diameter_gen.hrl
index 7e91ce375f..bc25f7d472 100644
--- a/lib/diameter/include/diameter_gen.hrl
+++ b/lib/diameter/include/diameter_gen.hrl
@@ -311,19 +311,55 @@ d(Name, Avp, Acc) ->
Failed = relax(Name), %% Not AvpName or else a failed Failed-AVP
%% decode is packed into 'AVP'.
- try avp(decode, Data, AvpName) of
+ Mod = dict(Failed), %% Dictionary to decode in.
+
+ try Mod:avp(decode, Data, AvpName) of
V ->
{Avps, T} = Acc,
{H, A} = ungroup(V, Avp),
{[H | Avps], pack_avp(Name, A, T)}
catch
error: Reason ->
- d(undefined == Failed orelse is_failed(), Reason, Name, Avp, Acc)
+ d(undefined == Failed orelse is_failed(),
+ Reason,
+ Name,
+ trim(Avp),
+ Acc)
after
reset(?STRICT_KEY, Strict),
reset(?FAILED_KEY, Failed)
end.
+%% trim/1
+%%
+%% Remove any extra bit that was added in diameter_codec to induce a
+%% 5014 error.
+
+trim(#diameter_avp{data = <<0:1, Bin/binary>>} = Avp) ->
+ Avp#diameter_avp{data = Bin};
+
+trim(Avp) ->
+ Avp.
+
+%% dict/1
+%%
+%% Retrieve the dictionary for the best-effort decode of Failed-AVP,
+%% as put by diameter_codec:decode/2. See that function for the
+%% explanation.
+
+dict(true) ->
+ case get({diameter_codec, dictionary}) of
+ undefined ->
+ ?MODULE;
+ Mod ->
+ Mod
+ end;
+
+dict(_) ->
+ ?MODULE.
+
+%% d/5
+
%% Ignore a decode error within Failed-AVP ...
d(true, _, Name, Avp, Acc) ->
decode_AVP(Name, Avp, Acc);
@@ -341,6 +377,8 @@ d(false, Reason, Name, Avp, {Avps, Acc}) ->
{Rec, Failed} = Acc,
{[Avp|Avps], {Rec, [rc(Reason, Avp) | Failed]}}.
+%% relax/2
+
%% 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.
@@ -357,22 +395,23 @@ relax(_, _) ->
is_strict() ->
false /= getr(?STRICT_KEY).
+%% relax/1
+%%
%% 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;
+ is_failed() orelse putr(?FAILED_KEY, true);
+
relax(_) ->
is_failed().
is_failed() ->
true == getr(?FAILED_KEY).
+%% reset/2
+
reset(Key, undefined) ->
eraser(Key);
reset(_, _) ->
@@ -453,8 +492,8 @@ pack_AVP(_, #diameter_avp{data = <<0:1, Data/binary>>} = Avp, Acc) ->
{Rec, Failed} = Acc,
{Rec, [{5014, Avp#diameter_avp{data = Data}} | Failed]};
-pack_AVP(Name, #diameter_avp{is_mandatory = M} = Avp, Acc) ->
- case pack_arity(Name, M) of
+pack_AVP(Name, #diameter_avp{is_mandatory = M, name = AvpName} = Avp, Acc) ->
+ case pack_arity(Name, AvpName, M) of
0 ->
{Rec, Failed} = Acc,
{Rec, [{if M -> 5001; true -> 5008 end, Avp} | Failed]};
@@ -462,10 +501,13 @@ pack_AVP(Name, #diameter_avp{is_mandatory = M} = Avp, Acc) ->
pack(Arity, 'AVP', Avp, Acc)
end.
-%% Give Failed-AVP special treatment since it'll contain any
-%% unrecognized mandatory AVP's.
-pack_arity(Name, M) ->
- NF = Name /= 'Failed-AVP' andalso not is_failed(),
+%% Give Failed-AVP special treatment since (1) it'll contain any
+%% unrecognized mandatory AVP's and (2) the RFC 3588 grammar failed to
+%% allow for Failed-AVP in an answer-message.
+
+pack_arity(Name, AvpName, M) ->
+ IsFailed = Name == 'Failed-AVP' orelse 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
@@ -473,12 +515,18 @@ pack_arity(Name, M) ->
%% 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 ->
- avp_arity(Name, 'AVP')
- end.
+
+ pack_arity(IsFailed
+ orelse {Name, AvpName} == {'answer-message', 'Failed-AVP'}
+ orelse not M
+ orelse not is_strict(),
+ Name).
+
+pack_arity(true, Name) ->
+ avp_arity(Name, 'AVP');
+
+pack_arity(false, _) ->
+ 0.
%% 3588:
%%