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-rw-r--r--lib/diameter/include/diameter_gen.hrl92
1 files changed, 68 insertions, 24 deletions
diff --git a/lib/diameter/include/diameter_gen.hrl b/lib/diameter/include/diameter_gen.hrl
index e8ffe7f92c..fb321054bd 100644
--- a/lib/diameter/include/diameter_gen.hrl
+++ b/lib/diameter/include/diameter_gen.hrl
@@ -333,16 +333,10 @@ d(Name, Avp, Acc) ->
{H, A} = ungroup(V, Avp),
{[H | Avps], pack_avp(Name, A, T)}
catch
- throw: {?TAG, {grouped, RC, ComponentAvps}} ->
- {Avps, {Rec, Errors}} = Acc,
- A = trim(Avp),
- {[[A | trim(ComponentAvps)] | Avps], {Rec, [{RC, A} | Errors]}};
+ throw: {?TAG, {grouped, Error, ComponentAvps}} ->
+ g(is_failed(), Error, Name, trim(Avp), Acc, ComponentAvps);
error: Reason ->
- d(undefined == Failed orelse is_failed(),
- Reason,
- Name,
- trim(Avp),
- Acc)
+ d(is_failed(), Reason, Name, trim(Avp), Acc)
after
reset(?STRICT_KEY, Strict),
reset(?FAILED_KEY, Failed)
@@ -380,6 +374,27 @@ dict(true) ->
dict(_) ->
?MODULE.
+%% g/5
+
+%% Ignore decode errors within Failed-AVP (best-effort) ...
+g(true, [_Error | Rec], Name, Avp, Acc, _ComponentAvps) ->
+ decode_AVP(Name, Avp#diameter_avp{value = Rec}, Acc);
+g(true, _Error, Name, Avp, Acc, _ComponentAvps) ->
+ decode_AVP(Name, Avp, Acc);
+
+%% ... or not.
+g(false, [Error | _Rec], _Name, Avp, Acc, ComponentAvps) ->
+ g(Error, Avp, Acc, ComponentAvps);
+g(false, Error, _Name, Avp, Acc, ComponentAvps) ->
+ g(Error, Avp, Acc, ComponentAvps).
+
+%% g/4
+
+g({RC, ErrorData}, Avp, Acc, ComponentAvps) ->
+ {Avps, {Rec, Errors}} = Acc,
+ E = Avp#diameter_avp{data = [ErrorData]},
+ {[[Avp | trim(ComponentAvps)] | Avps], {Rec, [{RC, E} | Errors]}}.
+
%% d/5
%% Ignore a decode error within Failed-AVP ...
@@ -424,14 +439,26 @@ is_strict() ->
%% Strictly, this doesn't need to be the case.
relax('Failed-AVP') ->
- is_failed() orelse putr(?FAILED_KEY, true);
+ putr(?FAILED_KEY, true);
relax(_) ->
is_failed().
-
+
+%% is_failed/0
+%%
+%% Is the AVP currently being decoded nested within Failed-AVP? Note
+%% that this is only true when Failed-AVP is the parent. In
+%% particular, it's not true when Failed-AVP itself is being decoded
+%% (unless nested).
+
is_failed() ->
true == getr(?FAILED_KEY).
+%% is_failed/1
+
+is_failed(Name) ->
+ 'Failed-AVP' == Name orelse is_failed().
+
%% reset/2
reset(Key, undefined) ->
@@ -451,8 +478,8 @@ decode_AVP(Name, Avp, {Avps, Acc}) ->
%% diameter_types will raise an error of this form to communicate
%% DIAMETER_INVALID_AVP_LENGTH (5014). A module specified to a
-%% @custom_types tag in a spec file can also raise an error of this
-%% form.
+%% @custom_types tag in a dictionary file can also raise an error of
+%% this form.
rc({'DIAMETER', 5014 = RC, _}, #diameter_avp{name = AvpName} = Avp) ->
{RC, Avp#diameter_avp{data = empty_value(AvpName)}};
@@ -528,17 +555,16 @@ pack_AVP(Name, #diameter_avp{is_mandatory = M, name = AvpName} = Avp, Acc) ->
%% 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
%% 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.
+ %% packed into a dedicated field defeats that point. Note
+ %% is_failed/1 since is_failed/0 will return false when packing
+ %% 'AVP' within Failed-AVP.
- pack_arity(IsFailed
+ pack_arity(is_failed(Name)
orelse {Name, AvpName} == {'answer-message', 'Failed-AVP'}
orelse not M
orelse not is_strict(),
@@ -610,9 +636,12 @@ value(_, Avp) ->
-> binary()
| no_return().
-%% Length error induced by diameter_codec:collect_avps/1.
+%% Length error induced by diameter_codec:collect_avps/1: the AVP
+%% length in the header was too short (insufficient for the extracted
+%% header) or too long (past the end of the message). An empty payload
+%% is sufficient according to the RFC text for 5014.
grouped_avp(decode, _Name, <<0:1, _/binary>>) ->
- throw({?TAG, {grouped, 5014, []}});
+ throw({?TAG, {grouped, {5014, []}, []}});
grouped_avp(decode, Name, Data) ->
grouped_decode(Name, diameter_codec:collect_avps(Data));
@@ -626,13 +655,28 @@ grouped_avp(encode, Name, Data) ->
%% decoded value, also returning the list of component diameter_avp
%% records.
+%% Length error in trailing component AVP.
grouped_decode(_Name, {Error, Acc}) ->
- {RC, Avp} = Error,
- throw({?TAG, {grouped, RC, [Avp | Acc]}});
-
+ {5014, Avp} = Error,
+ throw({?TAG, {grouped, Error, [Avp | Acc]}});
+
+%% 7.5. Failed-AVP AVP
+
+%% In the case where the offending AVP is embedded within a Grouped AVP,
+%% the Failed-AVP MAY contain the grouped AVP, which in turn contains
+%% the single offending AVP. The same method MAY be employed if the
+%% grouped AVP itself is embedded in yet another grouped AVP and so on.
+%% In this case, the Failed-AVP MAY contain the grouped AVP hierarchy up
+%% to the single offending AVP. This enables the recipient to detect
+%% the location of the offending AVP when embedded in a group.
+
+%% An error in decoding a component AVP throws the first fauly
+%% component, which the catch in d/3 wraps in the Grouped AVP in
+%% question. A partially decoded record is only used when ignoring
+%% errors in Failed-AVP.
grouped_decode(Name, ComponentAvps) ->
{Rec, Avps, Es} = decode_avps(Name, ComponentAvps),
- [] == Es orelse throw({?TAG, {grouped, 5004, Avps}}), %% decode failure
+ [] == Es orelse throw({?TAG, {grouped, [{_,_} = hd(Es) | Rec], Avps}}),
{Rec, Avps}.
%% ---------------------------------------------------------------------------