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Diffstat (limited to 'lib/snmp/src/agent/snmpa_get.erl')
| -rw-r--r-- | lib/snmp/src/agent/snmpa_get.erl | 1175 |
1 files changed, 1175 insertions, 0 deletions
diff --git a/lib/snmp/src/agent/snmpa_get.erl b/lib/snmp/src/agent/snmpa_get.erl new file mode 100644 index 0000000000..8b16016d84 --- /dev/null +++ b/lib/snmp/src/agent/snmpa_get.erl @@ -0,0 +1,1175 @@ +%% +%% %CopyrightBegin% +%% +%% Copyright Ericsson AB 2019-2019. All Rights Reserved. +%% +%% Licensed under the Apache License, Version 2.0 (the "License"); +%% you may not use this file except in compliance with the License. +%% You may obtain a copy of the License at +%% +%% http://www.apache.org/licenses/LICENSE-2.0 +%% +%% Unless required by applicable law or agreed to in writing, software +%% distributed under the License is distributed on an "AS IS" BASIS, +%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +%% See the License for the specific language governing permissions and +%% limitations under the License. +%% +%% %CopyrightEnd% +%% + +-module(snmpa_get). + +-behaviour(snmpa_get_mechanism). + + +%%%----------------------------------------------------------------- +%%% snmpa_get_mechanism exports +%%%----------------------------------------------------------------- + +-export([ + do_get/3, do_get/4, + do_get_next/3, + do_get_bulk/7 + ]). + +-define(VMODULE,"GET"). +-include("snmpa_internal.hrl"). +-include("snmp_types.hrl"). +-include("snmp_debug.hrl"). +-include("snmp_verbosity.hrl"). + +-ifndef(default_verbosity). +-define(default_verbosity,silence). +-endif. + +-define(empty_pdu_size, 21). + +-ifdef(snmp_extended_verbosity). +-define(vt(F,A), ?vtrace(F, A)). +-else. +-define(vt(_F, _A), ok). +-endif. + + +-define(AGENT, snmpa_agent). +-define(LIB, snmpa_get_lib). + + + +%%%----------------------------------------------------------------- +%%% 3. GET REQUEST +%%% -------------- +%%% According to RFC1157, section 4.1.2 and RFC1905, section 4.2.1. +%%% In rfc1157:4.1.2 it isn't specified if noSuchName should be +%%% returned even if some other varbind generates a genErr. +%%% In rfc1905:4.2.1 this is not a problem since exceptions are +%%% used, and thus a genErr will be returned anyway. +%%%----------------------------------------------------------------- + +%%----------------------------------------------------------------- +%% Func: do_get/2 +%% Purpose: Handles all VBs in a request that is inside the +%% mibview (local). +%% Returns: {noError, 0, ListOfNewVarbinds} | +%% {ErrorStatus, ErrorIndex, []} +%%----------------------------------------------------------------- + +%% There is now to properly spec the behaviour of the ?AGENT:subagent_get/3 +%% function (it *can* exit). +-dialyzer({nowarn_function, do_get/3}). +do_get(UnsortedVarbinds, IsNotification, _Extra) -> + {MyVarbinds, SubagentVarbinds} = ?LIB:agent_sort_vbs(UnsortedVarbinds), + case do_get_local(MyVarbinds, IsNotification) of + {noError, 0, NewMyVarbinds} -> + case do_get_subagents(SubagentVarbinds, IsNotification) of + {noError, 0, NewSubagentVarbinds} -> + {noError, 0, NewMyVarbinds ++ NewSubagentVarbinds}; + {ErrorStatus, ErrorIndex, _} -> + {ErrorStatus, ErrorIndex, []} + end; + {ErrorStatus, ErrorIndex, _} -> + {ErrorStatus, ErrorIndex, []} + end. + + +%%----------------------------------------------------------------- +%% Func: do_get/3 +%% Purpose: do_get handles "getRequests". +%% Pre: incoming varbinds have type == 'NULL', value == unSpecified +%% Returns: {noError, 0, ListOfNewVarbinds} | +%% {ErrorStatus, ErrorIndex, []} +%%----------------------------------------------------------------- + +do_get(MibView, UnsortedVarbinds, IsNotification, Extra) -> + ?vtrace("do_get -> entry with" + "~n MibView: ~p" + "~n UnsortedVarbinds: ~p" + "~n IsNotification: ~p", + [MibView, UnsortedVarbinds, IsNotification]), + %% This is me, the master, so go ahead + {OutSideView, InSideView} = ?LIB:split_vbs_view(UnsortedVarbinds, MibView), + {Error, Index, NewVbs} = do_get(InSideView, IsNotification, Extra), + {Error, Index, NewVbs ++ OutSideView}. + + + +%%----------------------------------------------------------------- +%% Func: do_get_local/2,3 +%% Purpose: Loop the variablebindings list. We know that each varbind +%% in that list belongs to us. +%% Returns: {noError, 0, ListOfNewVarbinds} | +%% {ErrorStatus, ErrorIndex, []} +%%----------------------------------------------------------------- + +do_get_local(VBs, IsNotification) -> + do_get_local(VBs, [], IsNotification). + +-dialyzer({nowarn_function, do_get_local/3}). +do_get_local([Vb | Vbs], Res, IsNotification) -> + case try_get(Vb, IsNotification) of + NewVb when is_record(NewVb, varbind) -> + do_get_local(Vbs, [NewVb | Res], IsNotification); + ListOfNewVb when is_list(ListOfNewVb) -> + do_get_local(Vbs, lists:append(ListOfNewVb, Res), IsNotification); + {error, Error, OrgIndex} -> + {Error, OrgIndex, []} + end; +do_get_local([], Res, _IsNotification) -> + {noError, 0, Res}. + + + +%%----------------------------------------------------------------- +%% Func: do_get_subagents/2 +%% Purpose: Loop the list of varbinds for different subagents. +%% For each of them, call sub_agent_get to retreive +%% the values for them. +%% Returns: {noError, 0, ListOfNewVarbinds} | +%% {ErrorStatus, ErrorIndex, []} +%%----------------------------------------------------------------- + +%% There is now to properly spec the behaviour of the ?AGENT:subagent_get/3 +%% function (it *can* exit). +-dialyzer({nowarn_function, do_get_subagents/3}). +do_get_subagents(SubagentVarbinds, IsNotification) -> + do_get_subagents(SubagentVarbinds, [], IsNotification). + +do_get_subagents([{SubAgentPid, SAVbs} | Tail], Res, IsNotification) -> + {_SAOids, Vbs} = ?LIB:sa_split(SAVbs), + case (catch ?AGENT:subagent_get(SubAgentPid, Vbs, IsNotification)) of + {noError, 0, NewVbs} -> + do_get_subagents(Tail, lists:append(NewVbs, Res), IsNotification); + {ErrorStatus, ErrorIndex, _} -> + {ErrorStatus, ErrorIndex, []}; + {'EXIT', Reason} -> + ?LIB:user_err("Lost contact with subagent (get) ~w. Using genErr", + [Reason]), + {genErr, 0, []} + end; +do_get_subagents([], Res, _IsNotification) -> + {noError, 0, Res}. + + +%%----------------------------------------------------------------- +%% Func: try_get/2 +%% Returns: {error, ErrorStatus, OrgIndex} | +%% #varbind | +%% List of #varbind +%%----------------------------------------------------------------- + +-dialyzer({nowarn_function, try_get/2}). +try_get(IVb, IsNotification) when is_record(IVb, ivarbind) -> + ?vtrace("try_get(ivarbind) -> entry with" + "~n IVb: ~p", [IVb]), + get_var_value_from_ivb(IVb, IsNotification); +try_get({TableOid, TableVbs}, IsNotification) -> + ?vtrace("try_get(table) -> entry with" + "~n TableOid: ~p" + "~n TableVbs: ~p", [TableOid, TableVbs]), + [#ivarbind{mibentry = MibEntry}|_] = TableVbs, + {NoAccessVbs, AccessVbs} = + check_all_table_vbs(TableVbs, IsNotification, [], []), + case get_tab_value_from_mib(MibEntry, TableOid, AccessVbs) of + {error, ErrorStatus, OrgIndex} -> + {error, ErrorStatus, OrgIndex}; + NVbs -> + NVbs ++ NoAccessVbs + end. + + +%%----------------------------------------------------------------- +%% Make sure all requested columns are accessible. +%%----------------------------------------------------------------- + +-dialyzer({nowarn_function, check_all_table_vbs/4}). +check_all_table_vbs([IVb| IVbs], IsNotification, NoA, A) -> + #ivarbind{mibentry = Me, varbind = Vb} = IVb, + case Me#me.access of + 'not-accessible' -> + NNoA = [Vb#varbind{value = noSuchInstance} | NoA], + check_all_table_vbs(IVbs, IsNotification, NNoA, A); + 'accessible-for-notify' when IsNotification =:= false -> + NNoA = [Vb#varbind{value = noSuchInstance} | NoA], + check_all_table_vbs(IVbs, IsNotification, NNoA, A); + 'write-only' -> + NNoA = [Vb#varbind{value = noSuchInstance} | NoA], + check_all_table_vbs(IVbs, IsNotification, NNoA, A); + _ -> + check_all_table_vbs(IVbs, IsNotification, NoA, [IVb | A]) + end; +check_all_table_vbs([], _IsNotification, NoA, A) -> {NoA, A}. + +%%----------------------------------------------------------------- +%% Returns: {error, ErrorStatus, OrgIndex} | +%% #varbind +%%----------------------------------------------------------------- +-dialyzer({nowarn_function, get_var_value_from_ivb/2}). +get_var_value_from_ivb(IVb, IsNotification) + when IVb#ivarbind.status =:= noError -> + ?vtrace("get_var_value_from_ivb(noError) -> entry", []), + #ivarbind{mibentry = Me, varbind = Vb} = IVb, + #varbind{org_index = OrgIndex, oid = Oid} = Vb, + case Me#me.access of + 'not-accessible' -> + Vb#varbind{value = noSuchInstance}; + 'accessible-for-notify' when IsNotification =:= false -> + Vb#varbind{value = noSuchInstance}; + 'write-only' -> + Vb#varbind{value = noSuchInstance}; + _ -> + case get_var_value_from_mib(Me, Oid) of + {value, Type, Value} -> + Vb#varbind{variabletype = Type, value = Value}; + {error, ErrorStatus} -> + {error, ErrorStatus, OrgIndex} + end + end; +get_var_value_from_ivb(#ivarbind{status = Status, varbind = Vb}, _) -> + ?vtrace("get_var_value_from_ivb(~p) -> entry", [Status]), + Vb#varbind{value = Status}. + +%%----------------------------------------------------------------- +%% Func: get_var_value_from_mib/1 +%% Purpose: +%% Returns: {error, ErrorStatus} | +%% {value, Type, Value} +%%----------------------------------------------------------------- +%% Pre: Oid is a correct instance Oid (lookup checked that). +%% Returns: A correct return value (see ?AGENT:make_value_a_correct_value) +-dialyzer({nowarn_function, get_var_value_from_mib/2}). +get_var_value_from_mib(#me{entrytype = variable, + asn1_type = ASN1Type, + mfa = {Mod, Func, Args}}, + _Oid) -> + ?vtrace("get_var_value_from_mib(variable) -> entry when" + "~n Mod: ~p" + "~n Func: ~p" + "~n Args: ~p", [Mod, Func, Args]), + Result = (catch ?LIB:dbg_apply(Mod, Func, [get | Args])), + %% mib shall return {value, <a-nice-value-within-range>} | + %% {noValue, noSuchName} (v1) | + %% {noValue, noSuchObject | noSuchInstance} (v2, v1) + %% everything else (including 'genErr') will generate 'genErr'. + ?AGENT:make_value_a_correct_value(Result, ASN1Type, {Mod, Func, Args}); + +get_var_value_from_mib(#me{entrytype = table_column, + oid = MeOid, + asn1_type = ASN1Type, + mfa = {Mod, Func, Args}}, + Oid) -> + ?vtrace("get_var_value_from_mib(table_column) -> entry when" + "~n MeOid: ~p" + "~n Mod: ~p" + "~n Func: ~p" + "~n Args: ~p" + "~n Oid: ~p", [MeOid, Mod, Func, Args, Oid]), + Col = lists:last(MeOid), + Indexes = snmp_misc:diff(Oid, MeOid), + [Result] = (catch ?LIB:dbg_apply(Mod, Func, [get, Indexes, [Col] | Args])), + ?AGENT:make_value_a_correct_value(Result, ASN1Type, + {Mod, Func, Args, Indexes, Col}). + + +%% For table operations we need to pass RestOid down to the table-function. +%% Its up to the table-function to check for noSuchInstance (ex: a +%% non-existing row). +%% Returns: {error, ErrorStatus, OrgIndex} | +%% {value, Type, Value} +-dialyzer({nowarn_function, get_tab_value_from_mib/3}). +get_tab_value_from_mib(#me{mfa = {Mod, Func, Args}}, TableOid, TableVbs) -> + ?vtrace("get_tab_value_from_mib -> entry when" + "~n Mod: ~p" + "~n Func: ~p" + "~n Args: ~p", [Mod, Func, Args]), + TableOpsWithShortOids = ?LIB:delete_prefixes(TableOid, TableVbs), + SortedVBsRows = snmpa_svbl:sort_varbinds_rows(TableOpsWithShortOids), + case get_value_all_rows(SortedVBsRows, Mod, Func, Args, []) of + {Error, Index} -> + #ivarbind{varbind = Vb} = lists:nth(Index, TableVbs), + {error, Error, Vb#varbind.org_index}; + ListOfValues -> + merge_varbinds_and_value(TableVbs, ListOfValues) + end. + +%%----------------------------------------------------------------- +%% Values is a scrambled list of {CorrectValue, Index}, where Index +%% is index into the #ivarbind list. So for each Value, we must +%% find the corresponding #ivarbind, and merge them into a new +%% #varbind. +%% The Values list comes from validate_tab_res. +%%----------------------------------------------------------------- +-dialyzer({nowarn_function, merge_varbinds_and_value/2}). +merge_varbinds_and_value(IVbs, [{{value, Type, Value}, Index} | Values]) -> + #ivarbind{varbind = Vb} = lists:nth(Index, IVbs), + [Vb#varbind{variabletype = Type, value = Value} | + merge_varbinds_and_value(IVbs, Values)]; +merge_varbinds_and_value(_, []) -> []. + +-dialyzer({nowarn_function, get_value_all_rows/5}). +get_value_all_rows([{[], OrgCols} | Rows], Mod, Func, Args, Res) -> + ?vtrace("get_value_all_rows -> entry when" + "~n OrgCols: ~p", [OrgCols]), + Cols = [{{value, noValue, noSuchInstance}, Index} || + {_Col, _ASN1Type, Index} <- OrgCols], + NewRes = lists:append(Cols, Res), + get_value_all_rows(Rows, Mod, Func, Args, NewRes); +get_value_all_rows([{RowIndex, OrgCols} | Rows], Mod, Func, Args, Res) -> + ?vtrace("get_value_all_rows -> entry when" + "~n RowIndex: ~p" + "~n OrgCols: ~p", [RowIndex, OrgCols]), + {DOrgCols, Dup} = remove_duplicates(OrgCols), + Cols = delete_index(DOrgCols), + Result = (catch ?LIB:dbg_apply(Mod, Func, [get, RowIndex, Cols | Args])), + case validate_tab_res(Result, DOrgCols, {Mod, Func, Args}) of + Values when is_list(Values) -> + NVals = restore_duplicates(Dup, Values), + NewRes = lists:append(NVals, Res), + get_value_all_rows(Rows, Mod, Func, Args, NewRes); + {error, ErrorStatus, Index} -> + ?AGENT:validate_err(row_set, {ErrorStatus, Index}, {Mod, Func, Args}) + end; +get_value_all_rows([], _Mod, _Func, _Args, Res) -> + ?vtrace("get_value_all_rows -> entry when done" + "~n Res: ~p", [Res]), + Res. + +%%----------------------------------------------------------------- +%% Args: {RowIndex, list of {ShortOid, ASN1Type}} +%% Returns: list of Col +%%----------------------------------------------------------------- +delete_index([{Col, _Val, _OrgIndex} | T]) -> + [Col | delete_index(T)]; +delete_index([]) -> []. + +%%----------------------------------------------------------------- +%% This function is called before 'get' on a table, and removes +%% any duplicate columns. It returns {Cols, DupInfo}. The Cols +%% are the unique columns. The instrumentation function is +%% called to get the values. These values, together with the +%% DupInfo, is later passed to restore_duplicates, which uses +%% the retrieved values to reconstruct the original column list, +%% but with the retrieved value for each column. +%%----------------------------------------------------------------- + +-dialyzer({nowarn_function, remove_duplicates/1}). +remove_duplicates(Cols) -> + remove_duplicates(Cols, [], []). + + +-dialyzer({nowarn_function, remove_duplicates/3}). +remove_duplicates([{Col, V1, OrgIdx1}, {Col, V2, OrgIdx2} | T], NCols, Dup) -> + remove_duplicates([{Col, V1, OrgIdx1} | T], NCols, + [{Col, V2, OrgIdx2} | Dup]); +remove_duplicates([Col | T], NCols, Dup) -> + remove_duplicates(T, [Col | NCols], Dup); +remove_duplicates([], NCols, Dup) -> + {lists:reverse(NCols), lists:reverse(Dup)}. + +-dialyzer({nowarn_function, restore_duplicates/2}). +restore_duplicates([], Cols) -> + [{Val, OrgIndex} || {_Col, Val, OrgIndex} <- Cols]; +restore_duplicates([{Col, _Val2, OrgIndex2} | Dup], + [{Col, NVal, OrgIndex1} | Cols]) -> + [{NVal, OrgIndex2} | + restore_duplicates(Dup, [{Col, NVal, OrgIndex1} | Cols])]; +restore_duplicates(Dup, [{_Col, Val, OrgIndex} | T]) -> + [{Val, OrgIndex} | restore_duplicates(Dup, T)]. + + + +%%----------------------------------------------------------------- +%% Three cases: +%% 1) All values ok +%% 2) table_func returned {Error, ...} +%% 3) Some value in Values list is erroneous. +%% Args: Value is a list of values from table_func(get..) +%% OrgCols is a list with {Col, ASN1Type, OrgIndex} +%% each element in Values and OrgCols correspond to each +%% other. +%%----------------------------------------------------------------- +-dialyzer({nowarn_function, validate_tab_res/3}). +validate_tab_res(Values, OrgCols, Mfa) when is_list(Values) -> + {_Col, _ASN1Type, OneIdx} = hd(OrgCols), + validate_tab_res(Values, OrgCols, Mfa, [], OneIdx); +validate_tab_res({noValue, Error}, OrgCols, Mfa) -> + Values = lists:duplicate(length(OrgCols), {noValue, Error}), + validate_tab_res(Values, OrgCols, Mfa); +validate_tab_res({genErr, Col}, OrgCols, Mfa) -> + case lists:keysearch(Col, 1, OrgCols) of + {value, {_Col, _ASN1Type, Index}} -> + {error, genErr, Index}; + _ -> + ?LIB:user_err("Invalid column in {genErr, ~w} from ~w (get)", + [Col, Mfa]), + [{_Col, _ASN1Type, Index} | _] = OrgCols, + {error, genErr, Index} + end; +validate_tab_res(genErr, [{_Col, __ASN1Type, Index} | _OrgCols], _Mfa) -> + {error, genErr, Index}; +validate_tab_res(Error, [{_Col, _ASN1Type, Index} | _OrgCols], Mfa) -> + ?LIB:user_err("Invalid return value ~w from ~w (get)",[Error, Mfa]), + {error, genErr, Index}. + +-dialyzer({nowarn_function, validate_tab_res/5}). +validate_tab_res([Value | Values], + [{Col, ASN1Type, Index} | OrgCols], + Mfa, Res, I) -> + %% This one makes it possible to return a list of genErr, which + %% is not allowed according to the manual. But that's ok, as + %% everything else will generate a genErr! (the only problem is + %% that it won't generate a user_error). + case ?AGENT:make_value_a_correct_value(Value, ASN1Type, Mfa) of + {error, ErrorStatus} -> + {error, ErrorStatus, Index}; + CorrectValue -> + NewRes = [{Col, CorrectValue, Index} | Res], + validate_tab_res(Values, OrgCols, Mfa, NewRes, I) + end; +validate_tab_res([], [], _Mfa, Res, _I) -> + lists:reverse(Res); +validate_tab_res([], [{_Col, _ASN1Type, Index}|_], Mfa, _Res, _I) -> + ?LIB:user_err("Too few values returned from ~w (get)", [Mfa]), + {error, genErr, Index}; +validate_tab_res(_TooMany, [], Mfa, _Res, I) -> + ?LIB:user_err("Too many values returned from ~w (get)", [Mfa]), + {error, genErr, I}. + + + +%%%----------------------------------------------------------------- +%%% 4. GET-NEXT REQUEST +%%% -------------- +%%% According to RFC1157, section 4.1.3 and RFC1905, section 4.2.2. +%%%----------------------------------------------------------------- +%%----------------------------------------------------------------- +%% Func: do_get_next/3 +%% Purpose: do_get_next handles "getNextRequests". +%% Note: Even if it is SNMPv1, a varbind's value can be +%% endOfMibView. This is converted to noSuchName in process_pdu. +%% Returns: {noError, 0, ListOfNewVarbinds} | +%% {ErrorStatus, ErrorIndex, []} +%% Note2: ListOfNewVarbinds is not sorted in any order!!! +%% Alg: First, the variables are sorted in OID order. +%% +%% Second, next in the MIB is performed for each OID, and +%% the result is collected as: if next oid is a variable, +%% perform a get to retrieve its value; if next oid is in a +%% table, save this value and continue until we get an oid +%% outside this table. Then perform get_next on the table, +%% and continue with all endOfTables and the oid outside the +%% table; if next oid is an subagent, save this value and +%% continue as in the table case. +%% +%% Third, each response is checked for endOfMibView, or (for +%% subagents) that the Oid returned has the correct prefix. +%% (This is necessary since an SA can be registered under many +%% separated subtrees, and if the last variable in the first +%% subtree is requested in a next, the SA will return the first +%% variable in the second subtree. This might be working, since +%% there may be a variable in between these subtrees.) For each +%% of these, a new get-next is performed, one at a time. +%% This alg. might be optimised in several ways. The most +%% striking one is that the same SA might be called several +%% times, when one time should be enough. But it isn't clear +%% that this really matters, since many nexts across the same +%% subagent must be considered to be very rare. +%%----------------------------------------------------------------- + +do_get_next(MibView, UnsortedVBs, _Extra) -> + do_get_next2(MibView, UnsortedVBs, infinity). + +%% The third argument is only used if we are called as result +%% of a get-bulk request. +do_get_next2(_MibView, UnsortedVarbinds, GbMaxVBs) + when (is_integer(GbMaxVBs) andalso (length(UnsortedVarbinds) > GbMaxVBs)) -> + {tooBig, 0, []}; % What is the correct index in this case? +do_get_next2(MibView, UnsortedVBs, GbMaxVBs) -> + ?vt("do_get_next2 -> entry when" + "~n MibView: ~p" + "~n UnsortedVBs: ~p", [MibView, UnsortedVBs]), + SortedVBs = ?LIB:oid_sort_vbs(UnsortedVBs), + ?vt("do_get_next -> " + "~n SortedVBs: ~p", [SortedVBs]), + next_loop_varbinds([], SortedVBs, MibView, [], [], GbMaxVBs). + +next_loop_varbinds(_, Vbs, _MibView, Res, _LAVb, GbMaxVBs) + when (is_integer(GbMaxVBs) andalso + ((length(Vbs) + length(Res)) > GbMaxVBs)) -> + {tooBig, 0, []}; % What is the correct index in this case? + +%% LAVb is Last Accessible Vb +next_loop_varbinds([], [Vb | Vbs], MibView, Res, LAVb, GbMaxVBs) -> + ?vt("next_loop_varbinds -> entry when" + "~n Vb: ~p" + "~n MibView: ~p", [Vb, MibView]), + case varbind_next(Vb, MibView) of + endOfMibView -> + ?vt("next_loop_varbind -> endOfMibView", []), + RVb = if LAVb =:= [] -> Vb; + true -> LAVb + end, + NewVb = RVb#varbind{variabletype = 'NULL', value = endOfMibView}, + next_loop_varbinds([], Vbs, MibView, [NewVb | Res], [], GbMaxVBs); + + {variable, ME, VarOid} when ((ME#me.access =/= 'not-accessible') andalso + (ME#me.access =/= 'write-only') andalso + (ME#me.access =/= 'accessible-for-notify')) -> + ?vt("next_loop_varbind -> variable: " + "~n ME: ~p" + "~n VarOid: ~p", [ME, VarOid]), + case try_get_instance(Vb, ME) of + {value, noValue, _NoSuchSomething} -> + ?vt("next_loop_varbind -> noValue", []), + %% Try next one + NewVb = Vb#varbind{oid = VarOid, + value = 'NULL'}, + next_loop_varbinds([], [NewVb | Vbs], MibView, Res, [], + GbMaxVBs); + {value, Type, Value} -> + ?vt("next_loop_varbind -> value" + "~n Type: ~p" + "~n Value: ~p", [Type, Value]), + NewVb = Vb#varbind{oid = VarOid, + variabletype = Type, + value = Value}, + next_loop_varbinds([], Vbs, MibView, [NewVb | Res], [], + GbMaxVBs); + {error, ErrorStatus} -> + ?vdebug("next loop varbinds:" + "~n ErrorStatus: ~p",[ErrorStatus]), + {ErrorStatus, Vb#varbind.org_index, []} + end; + {variable, _ME, VarOid} -> + ?vt("next_loop_varbind -> variable: " + "~n VarOid: ~p", [VarOid]), + RVb = if LAVb =:= [] -> Vb; + true -> LAVb + end, + NewVb = Vb#varbind{oid = VarOid, value = 'NULL'}, + next_loop_varbinds([], [NewVb | Vbs], MibView, Res, RVb, GbMaxVBs); + {table, TableOid, TableRestOid, ME} -> + ?vt("next_loop_varbind -> table: " + "~n TableOid: ~p" + "~n TableRestOid: ~p" + "~n ME: ~p", [TableOid, TableRestOid, ME]), + next_loop_varbinds({table, TableOid, ME, + [{tab_oid(TableRestOid), Vb}]}, + Vbs, MibView, Res, [], GbMaxVBs); + {subagent, SubAgentPid, SAOid} -> + ?vt("next_loop_varbind -> subagent: " + "~n SubAgentPid: ~p" + "~n SAOid: ~p", [SubAgentPid, SAOid]), + NewVb = Vb#varbind{variabletype = 'NULL', value = 'NULL'}, + next_loop_varbinds({subagent, SubAgentPid, SAOid, [NewVb]}, + Vbs, MibView, Res, [], GbMaxVBs) + end; +next_loop_varbinds({table, TableOid, ME, TabOids}, + [Vb | Vbs], MibView, Res, _LAVb, GbMaxVBs) -> + ?vt("next_loop_varbinds(table) -> entry with" + "~n TableOid: ~p" + "~n Vb: ~p", [TableOid, Vb]), + case varbind_next(Vb, MibView) of + {table, TableOid, TableRestOid, _ME} -> + next_loop_varbinds({table, TableOid, ME, + [{tab_oid(TableRestOid), Vb} | TabOids]}, + Vbs, MibView, Res, [], GbMaxVBs); + _ -> + case get_next_table(ME, TableOid, TabOids, MibView) of + {ok, TabRes, TabEndOfTabVbs} -> + NewVbs = lists:append(TabEndOfTabVbs, [Vb | Vbs]), + NewRes = lists:append(TabRes, Res), + next_loop_varbinds([], NewVbs, MibView, NewRes, [], + GbMaxVBs); + {ErrorStatus, OrgIndex} -> + ?vdebug("next loop varbinds: next varbind" + "~n ErrorStatus: ~p" + "~n OrgIndex: ~p", + [ErrorStatus,OrgIndex]), + {ErrorStatus, OrgIndex, []} + end + end; +next_loop_varbinds({table, TableOid, ME, TabOids}, + [], MibView, Res, _LAVb, GbMaxVBs) -> + ?vt("next_loop_varbinds(table) -> entry with" + "~n TableOid: ~p", [TableOid]), + case get_next_table(ME, TableOid, TabOids, MibView) of + {ok, TabRes, TabEndOfTabVbs} -> + ?vt("next_loop_varbinds(table) -> get_next_table result:" + "~n TabRes: ~p" + "~n TabEndOfTabVbs: ~p", [TabRes, TabEndOfTabVbs]), + NewRes = lists:append(TabRes, Res), + next_loop_varbinds([], TabEndOfTabVbs, MibView, NewRes, [], + GbMaxVBs); + {ErrorStatus, OrgIndex} -> + ?vdebug("next loop varbinds: next table" + "~n ErrorStatus: ~p" + "~n OrgIndex: ~p", + [ErrorStatus,OrgIndex]), + {ErrorStatus, OrgIndex, []} + end; +next_loop_varbinds({subagent, SAPid, SAOid, SAVbs}, + [Vb | Vbs], MibView, Res, _LAVb, GbMaxVBs) -> + ?vt("next_loop_varbinds(subagent) -> entry with" + "~n SAPid: ~p" + "~n SAOid: ~p" + "~n Vb: ~p", [SAPid, SAOid, Vb]), + case varbind_next(Vb, MibView) of + {subagent, _SubAgentPid, SAOid} -> + next_loop_varbinds({subagent, SAPid, SAOid, + [Vb | SAVbs]}, + Vbs, MibView, Res, [], GbMaxVBs); + _ -> + case get_next_sa(SAPid, SAOid, SAVbs, MibView) of + {ok, SARes, SAEndOfMibViewVbs} -> + NewVbs = lists:append(SAEndOfMibViewVbs, [Vb | Vbs]), + NewRes = lists:append(SARes, Res), + next_loop_varbinds([], NewVbs, MibView, NewRes, [], + GbMaxVBs); + {noSuchName, OrgIndex} -> + %% v1 reply, treat this Vb as endOfMibView, and try again + %% for the others. + case lists:keysearch(OrgIndex, #varbind.org_index, SAVbs) of + {value, EVb} -> + NextOid = next_oid(SAOid), + EndOfVb = + EVb#varbind{oid = NextOid, + value = {endOfMibView, NextOid}}, + case lists:delete(EVb, SAVbs) of + [] -> + next_loop_varbinds([], [EndOfVb, Vb | Vbs], + MibView, Res, [], + GbMaxVBs); + TryAgainVbs -> + next_loop_varbinds({subagent, SAPid, SAOid, + TryAgainVbs}, + [EndOfVb, Vb | Vbs], + MibView, Res, [], + GbMaxVBs) + end; + false -> + %% bad index from subagent + {genErr, (hd(SAVbs))#varbind.org_index, []} + end; + {ErrorStatus, OrgIndex} -> + ?vdebug("next loop varbinds: next subagent" + "~n Vb: ~p" + "~n ErrorStatus: ~p" + "~n OrgIndex: ~p", + [Vb,ErrorStatus,OrgIndex]), + {ErrorStatus, OrgIndex, []} + end + end; +next_loop_varbinds({subagent, SAPid, SAOid, SAVbs}, + [], MibView, Res, _LAVb, GbMaxVBs) -> + ?vt("next_loop_varbinds(subagent) -> entry with" + "~n SAPid: ~p" + "~n SAOid: ~p", [SAPid, SAOid]), + case get_next_sa(SAPid, SAOid, SAVbs, MibView) of + {ok, SARes, SAEndOfMibViewVbs} -> + NewRes = lists:append(SARes, Res), + next_loop_varbinds([], SAEndOfMibViewVbs, MibView, NewRes, [], + GbMaxVBs); + {noSuchName, OrgIndex} -> + %% v1 reply, treat this Vb as endOfMibView, and try again for + %% the others. + case lists:keysearch(OrgIndex, #varbind.org_index, SAVbs) of + {value, EVb} -> + NextOid = next_oid(SAOid), + EndOfVb = EVb#varbind{oid = NextOid, + value = {endOfMibView, NextOid}}, + case lists:delete(EVb, SAVbs) of + [] -> + next_loop_varbinds([], [EndOfVb], MibView, Res, [], + GbMaxVBs); + TryAgainVbs -> + next_loop_varbinds({subagent, SAPid, SAOid, + TryAgainVbs}, + [EndOfVb], MibView, Res, [], + GbMaxVBs) + end; + false -> + %% bad index from subagent + {genErr, (hd(SAVbs))#varbind.org_index, []} + end; + {ErrorStatus, OrgIndex} -> + ?vdebug("next loop varbinds: next subagent" + "~n ErrorStatus: ~p" + "~n OrgIndex: ~p", + [ErrorStatus,OrgIndex]), + {ErrorStatus, OrgIndex, []} + end; +next_loop_varbinds([], [], _MibView, Res, _LAVb, _GbMaxVBs) -> + ?vt("next_loop_varbinds -> entry when done", []), + {noError, 0, Res}. + +try_get_instance(_Vb, #me{mfa = {M, F, A}, asn1_type = ASN1Type}) -> + ?vtrace("try_get_instance -> entry with" + "~n M: ~p" + "~n F: ~p" + "~n A: ~p", [M,F,A]), + Result = (catch ?LIB:dbg_apply(M, F, [get | A])), + % mib shall return {value, <a-nice-value-within-range>} | + % {noValue, noSuchName} (v1) | + % {noValue, noSuchObject | noSuchInstance} (v2, v1) + % everything else (including 'genErr') will generate 'genErr'. + ?AGENT:make_value_a_correct_value(Result, ASN1Type, {M, F, A}). + +tab_oid([]) -> [0]; +tab_oid(X) -> X. + + +%%----------------------------------------------------------------- +%% Perform a next, using the varbinds Oid if value is simple +%% value. If value is {endOf<something>, NextOid}, use NextOid. +%% This case happens when a table has returned endOfTable, or +%% a subagent has returned endOfMibView. +%%----------------------------------------------------------------- +varbind_next(#varbind{value = Value, oid = Oid}, MibView) -> + ?vt("varbind_next -> entry with" + "~n Value: ~p" + "~n Oid: ~p" + "~n MibView: ~p", [Value, Oid, MibView]), + case Value of + {endOfTable, NextOid} -> + snmpa_mib:next(get(mibserver), NextOid, MibView); + {endOfMibView, NextOid} -> + snmpa_mib:next(get(mibserver), NextOid, MibView); + _ -> + snmpa_mib:next(get(mibserver), Oid, MibView) + end. + +get_next_table(#me{mfa = {M, F, A}}, TableOid, TableOids, MibView) -> + % We know that all TableOids have at least a column number as oid + ?vt("get_next_table -> entry with" + "~n M: ~p" + "~n F: ~p" + "~n A: ~p" + "~n TableOid: ~p" + "~n TableOids: ~p" + "~n MibView: ~p", [M, F, A, TableOid, TableOids, MibView]), + Sorted = snmpa_svbl:sort_varbinds_rows(TableOids), + case get_next_values_all_rows(Sorted, M,F,A, [], TableOid) of + NewVbs when is_list(NewVbs) -> + ?vt("get_next_table -> " + "~n NewVbs: ~p", [NewVbs]), + % We must now check each Vb for endOfTable and that it is + % in the MibView. If not, it becomes a endOfTable. We + % collect all of these together. + transform_tab_next_result(NewVbs, {[], []}, MibView); + {ErrorStatus, OrgIndex} -> + {ErrorStatus, OrgIndex} + end. + +get_next_values_all_rows([Row | Rows], M, F, A, Res, TabOid) -> + {RowIndex, TableOids} = Row, + Cols = delete_index(TableOids), + ?vt("get_next_values_all_rows -> " + "~n Cols: ~p", [Cols]), + Result = (catch ?LIB:dbg_apply(M, F, [get_next, RowIndex, Cols | A])), + ?vt("get_next_values_all_rows -> " + "~n Result: ~p", [Result]), + case validate_tab_next_res(Result, TableOids, {M, F, A}, TabOid) of + Values when is_list(Values) -> + ?vt("get_next_values_all_rows -> " + "~n Values: ~p", [Values]), + NewRes = lists:append(Values, Res), + get_next_values_all_rows(Rows, M, F, A, NewRes, TabOid); + {ErrorStatus, OrgIndex} -> + {ErrorStatus, OrgIndex} + end; +get_next_values_all_rows([], _M, _F, _A, Res, _TabOid) -> + Res. + +transform_tab_next_result([Vb | Vbs], {Res, EndOfs}, MibView) -> + case Vb#varbind.value of + {endOfTable, _} -> + {ResVBs, EndOfVBs} = ?LIB:split_vbs(Vbs, Res, [Vb | EndOfs]), + {ok, ResVBs, EndOfVBs}; + _ -> + case snmpa_acm:validate_mib_view(Vb#varbind.oid, MibView) of + true -> + transform_tab_next_result(Vbs, {[Vb|Res], EndOfs},MibView); + _ -> + Oid = Vb#varbind.oid, + NewEndOf = Vb#varbind{value = {endOfTable, Oid}}, + transform_tab_next_result(Vbs, {Res, [NewEndOf | EndOfs]}, + MibView) + end + end; +transform_tab_next_result([], {Res, EndOfs}, _MibView) -> + ?vt("transform_tab_next_result -> entry with: " + "~n Res: ~p" + "~n EndIfs: ~p",[Res, EndOfs]), + {ok, Res, EndOfs}. + + + +%%----------------------------------------------------------------- +%% Three cases: +%% 1) All values ok +%% 2) table_func returned {Error, ...} +%% 3) Some value in Values list is erroneous. +%% Args: Value is a list of values from table_func(get_next, ...) +%% TableOids is a list of {TabRestOid, OrgVb} +%% each element in Values and TableOids correspond to each +%% other. +%% Returns: List of NewVarbinds | +%% {ErrorStatus, OrgIndex} +%% (In the NewVarbinds list, the value may be endOfTable) +%%----------------------------------------------------------------- +validate_tab_next_res(Values, TableOids, Mfa, TabOid) -> + ?vt("validate_tab_next_res -> entry with: " + "~n Values: ~p" + "~n TableOids: ~p" + "~n Mfa: ~p" + "~n TabOid: ~p", [Values, TableOids, Mfa, TabOid]), + {_Col, _ASN1Type, OneIdx} = hd(TableOids), + validate_tab_next_res(Values, TableOids, Mfa, [], TabOid, + next_oid(TabOid), OneIdx). +validate_tab_next_res([{NextOid, Value} | Values], + [{_ColNo, OrgVb, _Index} | TableOids], + Mfa, Res, TabOid, TabNextOid, I) -> + ?vt("validate_tab_next_res -> entry with: " + "~n NextOid: ~p" + "~n Value: ~p" + "~n Values: ~p" + "~n TableOids: ~p" + "~n Mfa: ~p" + "~n TabOid: ~p", + [NextOid, Value, Values, TableOids, Mfa, TabOid]), + #varbind{org_index = OrgIndex} = OrgVb, + ?vt("validate_tab_next_res -> OrgIndex: ~p", [OrgIndex]), + NextCompleteOid = lists:append(TabOid, NextOid), + case snmpa_mib:lookup(get(mibserver), NextCompleteOid) of + {table_column, #me{asn1_type = ASN1Type}, _TableEntryOid} -> + ?vt("validate_tab_next_res -> ASN1Type: ~p", [ASN1Type]), + case ?AGENT:make_value_a_correct_value({value, Value}, ASN1Type, Mfa) of + {error, ErrorStatus} -> + ?vt("validate_tab_next_res -> " + "~n ErrorStatus: ~p", [ErrorStatus]), + {ErrorStatus, OrgIndex}; + {value, Type, NValue} -> + ?vt("validate_tab_next_res -> " + "~n Type: ~p" + "~n NValue: ~p", [Type, NValue]), + NewVb = OrgVb#varbind{oid = NextCompleteOid, + variabletype = Type, value = NValue}, + validate_tab_next_res(Values, TableOids, Mfa, + [NewVb | Res], TabOid, TabNextOid, I) + end; + Error -> + ?LIB:user_err("Invalid oid ~w from ~w (get_next). Using genErr => ~p", + [NextOid, Mfa, Error]), + {genErr, OrgIndex} + end; +validate_tab_next_res([endOfTable | Values], + [{_ColNo, OrgVb, _Index} | TableOids], + Mfa, Res, TabOid, TabNextOid, I) -> + ?vt("validate_tab_next_res(endOfTable) -> entry with: " + "~n Values: ~p" + "~n OrgVb: ~p" + "~n TableOids: ~p" + "~n Mfa: ~p" + "~n Res: ~p" + "~n TabOid: ~p" + "~n TabNextOid: ~p" + "~n I: ~p", + [Values, OrgVb, TableOids, Mfa, Res, TabOid, TabNextOid, I]), + NewVb = OrgVb#varbind{value = {endOfTable, TabNextOid}}, + validate_tab_next_res(Values, TableOids, Mfa, [NewVb | Res], + TabOid, TabNextOid, I); +validate_tab_next_res([], [], _Mfa, Res, _TabOid, _TabNextOid, _I) -> + Res; +validate_tab_next_res([], [{_Col, _OrgVb, Index}|_], Mfa, _Res, _, _, _I) -> + ?LIB:user_err("Too few values returned from ~w (get_next)", [Mfa]), + {genErr, Index}; +validate_tab_next_res({genErr, ColNumber}, OrgCols, + Mfa, _Res, _TabOid, _TabNextOid, _I) -> + OrgIndex = snmpa_svbl:col_to_orgindex(ColNumber, OrgCols), + ?AGENT:validate_err(table_next, {genErr, OrgIndex}, Mfa); +validate_tab_next_res({error, Reason}, [{_ColNo, OrgVb, _Index} | _TableOids], + Mfa, _Res, _TabOid, _TabNextOid, _I) -> + #varbind{org_index = OrgIndex} = OrgVb, + ?LIB:user_err("Erroneous return value ~w from ~w (get_next)", + [Reason, Mfa]), + {genErr, OrgIndex}; +validate_tab_next_res(Error, [{_ColNo, OrgVb, _Index} | _TableOids], + Mfa, _Res, _TabOid, _TabNextOid, _I) -> + #varbind{org_index = OrgIndex} = OrgVb, + ?LIB:user_err("Invalid return value ~w from ~w (get_next)", + [Error, Mfa]), + {genErr, OrgIndex}; +validate_tab_next_res(TooMany, [], Mfa, _Res, _, _, I) -> + ?LIB:user_err("Too many values ~w returned from ~w (get_next)", + [TooMany, Mfa]), + {genErr, I}. + +%%----------------------------------------------------------------- +%% Func: get_next_sa/4 +%% Purpose: Loop the list of varbinds for the subagent. +%% Call subagent_get_next to retreive +%% the next varbinds. +%% Returns: {ok, ListOfNewVbs, ListOfEndOfMibViewsVbs} | +%% {ErrorStatus, ErrorIndex} +%%----------------------------------------------------------------- +get_next_sa(SAPid, SAOid, SAVbs, MibView) -> + case catch ?AGENT:subagent_get_next(SAPid, MibView, SAVbs) of + {noError, 0, NewVbs} -> + NewerVbs = transform_sa_next_result(NewVbs,SAOid,next_oid(SAOid)), + {ResVBs, EndOfVBs} = ?LIB:split_vbs(NewerVbs), + {ok, ResVBs, EndOfVBs}; + {ErrorStatus, ErrorIndex, _} -> + {ErrorStatus, ErrorIndex}; + {'EXIT', Reason} -> + ?LIB:user_err("Lost contact with subagent (next) ~w. Using genErr", + [Reason]), + {genErr, 0} + end. + +%%----------------------------------------------------------------- +%% Check for wrong prefix returned or endOfMibView, and convert +%% into {endOfMibView, SANextOid}. +%%----------------------------------------------------------------- +transform_sa_next_result([Vb | Vbs], SAOid, SANextOid) + when Vb#varbind.value =:= endOfMibView -> + [Vb#varbind{value = {endOfMibView, SANextOid}} | + transform_sa_next_result(Vbs, SAOid, SANextOid)]; +transform_sa_next_result([Vb | Vbs], SAOid, SANextOid) -> + case lists:prefix(SAOid, Vb#varbind.oid) of + true -> + [Vb | transform_sa_next_result(Vbs, SAOid, SANextOid)]; + _ -> + [Vb#varbind{oid = SANextOid, value = {endOfMibView, SANextOid}} | + transform_sa_next_result(Vbs, SAOid, SANextOid)] + end; +transform_sa_next_result([], _SAOid, _SANextOid) -> + []. + + +next_oid(Oid) -> + case lists:reverse(Oid) of + [H | T] -> lists:reverse([H+1 | T]); + [] -> [] + end. + + + +%%%----------------------------------------------------------------- +%%% 5. GET-BULK REQUEST +%%% +%%% In order to prevent excesses in reply sizes there are two +%%% preventive methods in place. One is to check that the encode +%%% size does not exceed Max PDU size (this is mentioned in the +%%% standard). The other is a simple VBs limit. That is, the +%%% resulting response cannot contain more then this number of VBs. +%%%----------------------------------------------------------------- + +do_get_bulk(MibView, NonRepeaters, MaxRepetitions, + PduMS, Varbinds, GbMaxVBs, _Extra) -> + ?vtrace("do_get_bulk -> entry with" + "~n MibView: ~p" + "~n NonRepeaters: ~p" + "~n MaxRepetitions: ~p" + "~n PduMS: ~p" + "~n Varbinds: ~p" + "~n GbMaxVBs: ~p", + [MibView, NonRepeaters, MaxRepetitions, PduMS, Varbinds, GbMaxVBs]), + {NonRepVbs, RestVbs} = ?LIB:split_vbs_gb(NonRepeaters, Varbinds), + ?vt("do_get_bulk -> split: " + "~n NonRepVbs: ~p" + "~n RestVbs: ~p", [NonRepVbs, RestVbs]), + case do_get_next2(MibView, NonRepVbs, GbMaxVBs) of + {noError, 0, UResNonRepVbs} -> + ?vt("do_get_bulk -> next noError: " + "~n UResNonRepVbs: ~p", [UResNonRepVbs]), + ResNonRepVbs = lists:keysort(#varbind.org_index, UResNonRepVbs), + %% Decode the first varbinds, produce a reversed list of + %% listOfBytes. + case (catch enc_vbs(PduMS - ?empty_pdu_size, ResNonRepVbs)) of + {error, Idx, Reason} -> + ?LIB:user_err("failed encoding varbind ~w:~n~p", [Idx, Reason]), + {genErr, Idx, []}; + {SizeLeft, Res} when is_integer(SizeLeft) and is_list(Res) -> + ?vtrace("do_get_bulk -> encoded: " + "~n SizeLeft: ~p" + "~n Res: ~w", [SizeLeft, Res]), + case (catch do_get_rep(SizeLeft, MibView, MaxRepetitions, + RestVbs, Res, + length(UResNonRepVbs), GbMaxVBs)) of + {error, Idx, Reason} -> + ?LIB:user_err("failed encoding varbind ~w:~n~p", + [Idx, Reason]), + {genErr, Idx, []}; + Res when is_list(Res) -> + ?vtrace("do get bulk -> Res: " + "~n ~w", [Res]), + {noError, 0, conv_res(Res)}; + {noError, 0, Data} = OK -> + ?vtrace("do get bulk -> OK: " + "~n length(Data): ~w", [length(Data)]), + OK; + Else -> + ?vtrace("do get bulk -> Else: " + "~n ~w", [Else]), + Else + end; + Res when is_list(Res) -> + {noError, 0, conv_res(Res)} + end; + + {ErrorStatus, Index, _} -> + ?vdebug("do get bulk: " + "~n ErrorStatus: ~p" + "~n Index: ~p",[ErrorStatus, Index]), + {ErrorStatus, Index, []} + end. + +enc_vbs(SizeLeft, Vbs) -> + ?vt("enc_vbs -> entry with" + "~n SizeLeft: ~w", [SizeLeft]), + Fun = fun(Vb, {Sz, Res}) when Sz > 0 -> + ?vt("enc_vbs -> (fun) entry with" + "~n Vb: ~p" + "~n Sz: ~p" + "~n Res: ~w", [Vb, Sz, Res]), + case (catch snmp_pdus:enc_varbind(Vb)) of + {'EXIT', Reason} -> + ?vtrace("enc_vbs -> encode failed: " + "~n Reason: ~p", [Reason]), + throw({error, Vb#varbind.org_index, Reason}); + X -> + ?vt("enc_vbs -> X: ~w", [X]), + Lx = length(X), + ?vt("enc_vbs -> Lx: ~w", [Lx]), + if + Lx < Sz -> + {Sz - length(X), [X | Res]}; + true -> + throw(Res) + end + end; + (_Vb, {_Sz, [_H | T]}) -> + ?vt("enc_vbs -> (fun) entry with" + "~n T: ~p", [T]), + throw(T); + (_Vb, {_Sz, []}) -> + ?vt("enc_vbs -> (fun) entry", []), + throw([]) + end, + lists:foldl(Fun, {SizeLeft, []}, Vbs). + +do_get_rep(Sz, MibView, MaxRepetitions, Varbinds, Res, GbNumVBs, GbMaxVBs) + when MaxRepetitions >= 0 -> + do_get_rep(Sz, MibView, 0, MaxRepetitions, Varbinds, Res, + GbNumVBs, GbMaxVBs); +do_get_rep(Sz, MibView, _MaxRepetitions, Varbinds, Res, GbNumVBs, GbMaxVBs) -> + do_get_rep(Sz, MibView, 0, 0, Varbinds, Res, GbNumVBs, GbMaxVBs). + +conv_res(ResVarbinds) -> + conv_res(ResVarbinds, []). +conv_res([VbListOfBytes | T], Bytes) -> + conv_res(T, VbListOfBytes ++ Bytes); +conv_res([], Bytes) -> + Bytes. + +%% The only other value, then a positive integer, is infinity. +do_get_rep(_Sz, _MibView, Count, Max, _, _Res, GbNumVBs, GbMaxVBs) + when (is_integer(GbMaxVBs) andalso (GbNumVBs > GbMaxVBs)) -> + ?vinfo("Max Get-BULK VBs limit (~w) exceeded (~w) when:" + "~n Count: ~p" + "~n Max: ~p", [GbMaxVBs, GbNumVBs, Count, Max]), + {tooBig, 0, []}; +do_get_rep(_Sz, _MibView, Max, Max, _, Res, _GbNumVBs, _GbMaxVBs) -> + ?vt("do_get_rep -> done when: " + "~n Res: ~p", [Res]), + {noError, 0, conv_res(Res)}; +do_get_rep(Sz, MibView, Count, Max, Varbinds, Res, GbNumVBs, GbMaxVBs) -> + ?vt("do_get_rep -> entry when: " + "~n Sz: ~p" + "~n Count: ~p" + "~n Res: ~w", [Sz, Count, Res]), + case try_get_bulk(Sz, MibView, Varbinds, GbMaxVBs) of + {noError, NextVarbinds, SizeLeft, Res2} -> + ?vt("do_get_rep -> noError: " + "~n SizeLeft: ~p" + "~n Res2: ~p", [SizeLeft, Res2]), + do_get_rep(SizeLeft, MibView, Count+1, Max, NextVarbinds, + Res2 ++ Res, + GbNumVBs + length(Varbinds), GbMaxVBs); + {endOfMibView, _NextVarbinds, _SizeLeft, Res2} -> + ?vt("do_get_rep -> endOfMibView: " + "~n Res2: ~p", [Res2]), + {noError, 0, conv_res(Res2 ++ Res)}; + {ErrorStatus, Index} -> + ?vtrace("do_get_rep -> done when error: " + "~n ErrorStatus: ~p" + "~n Index: ~p", [ErrorStatus, Index]), + {ErrorStatus, Index, []} + end. + +try_get_bulk(Sz, MibView, Varbinds, GbMaxVBs) -> + ?vt("try_get_bulk -> entry with" + "~n Sz: ~w" + "~n MibView: ~w" + "~n Varbinds: ~w", [Sz, MibView, Varbinds]), + case do_get_next2(MibView, Varbinds, GbMaxVBs) of + {noError, 0, UNextVarbinds} -> + ?vt("try_get_bulk -> noError: " + "~n UNextVarbinds: ~p", [UNextVarbinds]), + NextVarbinds = ?LIB:org_index_sort_vbs(UNextVarbinds), + case (catch enc_vbs(Sz, NextVarbinds)) of + {error, Idx, Reason} -> + ?LIB:user_err("failed encoding varbind ~w:~n~p", [Idx, Reason]), + ?vtrace("try_get_bulk -> encode error: " + "~n Idx: ~p" + "~n Reason: ~p", [Idx, Reason]), + {genErr, Idx}; + {SizeLeft, Res} when is_integer(SizeLeft) andalso + is_list(Res) -> + ?vt("try get bulk -> encode ok: " + "~n SizeLeft: ~w" + "~n Res: ~w", [SizeLeft, Res]), + {check_end_of_mibview(NextVarbinds), + NextVarbinds, SizeLeft, Res}; + Res when is_list(Res) -> + ?vt("try get bulk -> Res: " + "~n ~w", [Res]), + {endOfMibView, [], 0, Res} + end; + {ErrorStatus, Index, _} -> + ?vt("try_get_bulk -> error: " + "~n ErrorStatus: ~p" + "~n Index: ~p", [ErrorStatus, Index]), + {ErrorStatus, Index} + end. + +%% If all variables in this pass are endOfMibView, +%% there is no reason to continue. +check_end_of_mibview([#varbind{value = endOfMibView} | T]) -> + check_end_of_mibview(T); +check_end_of_mibview([]) -> endOfMibView; +check_end_of_mibview(_) -> noError. + + + |