diff options
Diffstat (limited to 'lib/diameter/include')
| -rw-r--r-- | lib/diameter/include/diameter_gen.hrl | 92 |
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}. %% --------------------------------------------------------------------------- |