diff options
Diffstat (limited to 'lib/snmp/src/agent/snmpa_mib_data.erl')
| -rw-r--r-- | lib/snmp/src/agent/snmpa_mib_data.erl | 1374 |
1 files changed, 64 insertions, 1310 deletions
diff --git a/lib/snmp/src/agent/snmpa_mib_data.erl b/lib/snmp/src/agent/snmpa_mib_data.erl index b80d85d2ee..4d8a12b6c6 100644 --- a/lib/snmp/src/agent/snmpa_mib_data.erl +++ b/lib/snmp/src/agent/snmpa_mib_data.erl @@ -1,7 +1,7 @@ %% %% %CopyrightBegin% %% -%% Copyright Ericsson AB 1996-2009. All Rights Reserved. +%% Copyright Ericsson AB 1996-2013. All Rights Reserved. %% %% The contents of this file are subject to the Erlang Public License, %% Version 1.1, (the "License"); you may not use this file except in @@ -18,1338 +18,92 @@ %% -module(snmpa_mib_data). -%%%----------------------------------------------------------------- -%%% This module implements the MIB internal data structures. -%%% An MIB Data Structure consists of three items; an ets-table, -%%% a tree and a list of registered subagents. -%%% The subagent information is consequently duplicated. It resides -%%% both in the tree and in the list. -%%% The ets-table contains all data associated with each variable, -%%% table, tableentry and tablecolumn in the MIB. -%%% The tree contains information of the Oids in the MIB. -%%% -%%% When a mib is loaded, the tree is built from the plain list -%%% in the binary file. -%%%----------------------------------------------------------------- --include("snmp_types.hrl"). --include("snmp_debug.hrl"). - --define(VMODULE,"MDATA"). --include("snmp_verbosity.hrl"). - --define(MIB_DATA,snmpa_mib_data). --define(MIB_NODE,snmpa_mib_node). --define(MIB_TREE,snmpa_mib_tree). --define(DUMMY_TREE_GENERATION,1). --define(DEFAULT_TREE,{tree,{undefined_node},internal}). -%%-define(DUMMY_TREE_DB,dummy_tree_db). -%%-define(DUMMY_TREE_DB_INIT,{?DUMMY_TREE_DB,?DEFAULT_TREE}). - +-include_lib("snmp/include/snmp_types.hrl"). %%%----------------------------------------------------------------- -%%% Table of contents -%%% ================= -%%% 1. Interface -%%% 2. Implementation of tree access -%%% 3. Tree building functions -%%% 4. Tree merging -%%% 5. Tree deletion routines -%%% 6. Functions for subagent handling -%%% 7. Misc functions +%%% This is the behaviour for the MIB server backend internal +%%% data storage. %%%----------------------------------------------------------------- +%% These types should really be defined elsewhere... +-export_type([ + mib_view/0, + mib_view_elem/0, + mib_view_mask/0, + mib_view_inclusion/0 + ]). -%%---------------------------------------------------------------------- -%% data_db is an database containing loaded mibs as: -%% {MibName = atom(), Symbolic = ?, FullFileName = string()} -%% it is either ets or mnesia -%% tree_db is a database containing _one_ record with the tree! -%% (the reason for this is part to get replication and part out of convenience) -%% ref_tree is the root node, without any subagent. -%% tree is the root node (same as ref_tree but with the subagents added). -%% subagents is a list of {SAPid, Oid} -%%---------------------------------------------------------------------- --record(mib_data, {mib_db, % table of #mib_info - node_db, % table of #node_info - tree_db, % table of #tree - tree, % The actual tree - subagents = []}). - --record(mib_info, {name, symbolic, file_name}). --record(node_info, {oid, mib_name, me}). - - -%% API --export([new/0, new/1, sync/1, close/1, - load_mib/4, unload_mib/4, which_mibs/1, whereis_mib/2, - info/1, info/2, - dump/1, dump/2, - backup/2, - lookup/2, next/3, which_mib/2, - register_subagent/3, unregister_subagent/2]). - -%% Internal exports --export([code_change/2]). - - -%%----------------------------------------------------------------- -%% A tree is represented as a N-tuple, where each element is a -%% node. A node is: -%% 1) {tree, Tree, Info} where Info can be {table, Id}, {table_entry, Id} -%% or perhaps 'internal' -%% 2) undefined_node (memory optimization (instead of {node, undefined})) -%% 3) {node, Info} where Info can be {subagent, Pid}, {variable, Id}, -%% {table_column, Id} -%% Id is {MibName, MibEntry} -%% The over all root is represented as {tree, Tree, internal}. -%% -%% tree() = {tree, nodes(), tree_info()} -%% nodes() = {tree() | node() | undefined_node, ...} -%% node() = {node, node_info()} -%% tree_info() = {table, Id} | {table_entry, Id} | internal -%% node_info() = {subagent, Pid} | {variable, Id} | {table_colum, Id} -%%----------------------------------------------------------------- - -%% This record is what is stored in the database. The 'tree' part -%% is described above... --record(tree,{generation = ?DUMMY_TREE_GENERATION, root = ?DEFAULT_TREE}). - - -%%%====================================================================== -%%% 1. Interface -%%%====================================================================== - -%%----------------------------------------------------------------- -%% Func: new/0, new/1 -%% Returns: A representation of mib data. -%%----------------------------------------------------------------- -new() -> - new(ets). - -%% Where -> A list of nodes where the tables will be created -new(Storage) -> - %% First we must check if there is already something to read - %% If a database already exists, then the tree structure has to be read - ?vtrace("open (mib) database",[]), - MibDb = snmpa_general_db:open(Storage, ?MIB_DATA, - mib_info, - record_info(fields,mib_info), set), - ?vtrace("open (mib) node database",[]), - NodeDb = snmpa_general_db:open(Storage, ?MIB_NODE, - node_info, - record_info(fields,node_info), set), - ?vtrace("open (mib) tree database",[]), - TreeDb = snmpa_general_db:open(Storage, ?MIB_TREE, - tree, - record_info(fields,tree), set), - Tree = - case snmpa_general_db:read(TreeDb, ?DUMMY_TREE_GENERATION) of - false -> - T = #tree{}, - snmpa_general_db:write(TreeDb, T), - T; - {value, T} -> - T - end, - install_mibs(MibDb, NodeDb), - #mib_data{mib_db = MibDb, - node_db = NodeDb, - tree_db = TreeDb, - tree = Tree}. - - -%%---------------------------------------------------------------------- -%% Returns: new mib data | {error, Reason} -%%---------------------------------------------------------------------- -load_mib(MibData,FileName,MeOverride,TeOverride) - when is_record(MibData,mib_data) andalso is_list(FileName) -> - ?vlog("load mib file: ~p",[FileName]), - ActualFileName = filename:rootname(FileName, ".bin") ++ ".bin", - MibName = list_to_atom(filename:basename(FileName, ".bin")), - (catch do_load_mib(MibData, ActualFileName, MibName, - MeOverride, TeOverride)). - -do_load_mib(MibData, ActualFileName, MibName, MeOverride, TeOverride) -> - ?vtrace("do_load_mib -> entry with" - "~n ActualFileName: ~s" - "~n MibName: ~p",[ActualFileName, MibName]), - #mib_data{mib_db = MibDb, - node_db = NodeDb, - %% tree_db = TreeDb, - tree = Tree} = MibData, - verify_not_loaded(MibDb, MibName), - ?vtrace("do_load_mib -> already loaded mibs:" - "~n ~p",[loaded(MibDb)]), - Mib = do_read_mib(ActualFileName), - ?vtrace("do_load_mib -> read mib ~s",[Mib#mib.name]), - NonInternalMes = - lists:filter(fun(ME) -> maybe_drop_me(ME) end, Mib#mib.mes), - OldRoot = Tree#tree.root, - T = build_tree(NonInternalMes, MibName), - ?d("load_mib -> " - "~n OldRoot: ~p" - "~n T: ~p", [OldRoot, T]), - case (catch merge_nodes(T, OldRoot)) of - {error_merge_nodes, Node1, Node2} -> - ?vlog("error merging nodes:" - "~n~p~nand~n~p", [Node1,Node2]), - {error, oid_conflict}; - NewRoot when is_tuple(NewRoot) andalso (element(1,NewRoot) =:= tree) -> - ?d("load_mib -> " - "~n NewRoot: ~p", [NewRoot]), - Symbolic = not lists:member(no_symbolic_info, Mib#mib.misc), - case (catch check_notif_and_mes(TeOverride, MeOverride, Symbolic, - Mib#mib.traps, NonInternalMes)) of - true -> - install_mes(NodeDb, MibName, NonInternalMes), - install_mib(MibDb, Symbolic, Mib, - MibName, ActualFileName, NonInternalMes), - ?vtrace("installed mib ~s", [Mib#mib.name]), - Tree2 = Tree#tree{root = NewRoot}, - %% snmpa_general_db:write(TreeDb, Tree2), %% Store later? - {ok, MibData#mib_data{tree = Tree2}}; - Else -> - Else - end - end. - - -verify_not_loaded(Db, Name) -> - case snmpa_general_db:read(Db, Name) of - {value, #mib_info{name = Name}} -> - throw({error, 'already loaded'}); - false -> - ok - end. - -do_read_mib(ActualFileName) -> - case snmp_misc:read_mib(ActualFileName) of - {error, Reason} -> - ?vlog("Failed reading mib file ~p with reason: ~p", - [ActualFileName,Reason]), - throw({error, Reason}); - {ok, Mib} -> - Mib - end. - -%% The Tree DB is handled in a special way since it can be very large. -sync(#mib_data{mib_db = M, - node_db = N, - tree_db = T, tree = Tree, subagents = []}) -> - snmpa_general_db:sync(M), - snmpa_general_db:sync(N), - snmpa_general_db:write(T, Tree), - snmpa_general_db:sync(T); -sync(#mib_data{mib_db = M, - node_db = N, - tree_db = T, tree = Tree, subagents = SAs}) -> - - snmpa_general_db:sync(M), - snmpa_general_db:sync(N), - - %% Ouch. Since the subagent info is dynamic we do not - %% want to store the tree containing subagent info. So, we - %% have to create a tmp tree without those and store it. - - case delete_subagents(Tree, SAs) of - {ok, TreeWithoutSAs} -> - snmpa_general_db:write(T, TreeWithoutSAs), - snmpa_general_db:sync(T); - Error -> - Error - end. - -delete_subagents(Tree, []) -> - {ok, Tree}; -delete_subagents(Tree0, [{_, Oid}|SAs]) -> - case (catch delete_subagent(Tree0, Oid)) of - {tree, _Tree, _Info} = Tree1 -> - delete_subagents(Tree1, SAs); - _Error -> - {error, {'invalid oid', Oid}} - end. - -%%---------------------------------------------------------------------- -%% (OTP-3601) -%%---------------------------------------------------------------------- -check_notif_and_mes(TeOverride,MeOverride,Symbolic,Traps,MEs) -> - ?vtrace("check notifications and mib entries",[]), - check_notifications(TeOverride,Symbolic,Traps), - check_mes(MeOverride,MEs). - -check_notifications(true, _Symbolic, _Traps) -> - ?vtrace("trapentry override = true => skip check",[]), - true; -check_notifications(_, Symbolic, Traps) -> - check_notifications(Symbolic, Traps). - -check_notifications(true, Traps) -> - check_notifications(Traps); -check_notifications(_, _) -> true. - -check_notifications([]) -> true; -check_notifications([#trap{trapname = Key} = Trap | Traps]) -> - ?vtrace("check notification [trap] with Key: ~p",[Key]), - case snmpa_symbolic_store:get_notification(Key) of - {value, Trap} -> check_notifications(Traps); - {value, _} -> throw({error, {'trap already defined', Key}}); - undefined -> check_notifications(Traps) - end; -check_notifications([#notification{trapname = Key} = Notif | Traps]) -> - ?vtrace("check notification [notification] with Key: ~p",[Key]), - case snmpa_symbolic_store:get_notification(Key) of - {value, Notif} -> - check_notifications(Traps); - {value, _} -> - throw({error, {'notification already defined', Key}}); - undefined -> - check_notifications(Traps) - end; -check_notifications([Crap | Traps]) -> - ?vlog("skipped check of: ~n~p",[Crap]), - check_notifications(Traps). - -check_mes(true,_) -> - ?vtrace("mibentry override = true => skip check",[]), - true; -check_mes(_,MEs) -> - check_mes(MEs). - -check_mes([]) -> true; -check_mes([#me{aliasname = Name, oid = Oid1} | MEs]) -> - ?vtrace("check mib entries with aliasname: ~p",[Name]), - case snmpa_symbolic_store:aliasname_to_oid(Name) of - {value, Oid1} -> - check_mes(MEs); - {value, Oid2} -> - ?vinfo("~n expecting '~p'~n but found '~p'",[Oid1, Oid2]), - throw({error, {'mibentry already defined', Name}}); - false -> - check_mes(MEs) - end; -check_mes([Crap | MEs]) -> - ?vlog("skipped check of: ~n~p",[Crap]), - check_mes(MEs). - - - -%%---------------------------------------------------------------------- -%% Returns: new mib data | {error, Reason} -%%---------------------------------------------------------------------- -unload_mib(MibData, FileName, _, _) when is_list(FileName) -> - MibName = list_to_atom(filename:basename(FileName, ".bin")), - (catch do_unload_mib(MibData, MibName)). - -do_unload_mib(MibData, MibName) -> - ?vtrace("do_unload_mib -> entry with" - "~n MibName: ~p", [MibName]), - #mib_data{mib_db = MibDb, - node_db = NodeDb, - %% tree_db = TreeDb, - tree = Tree} = MibData, - #mib_info{symbolic = Symbolic} = verify_loaded(MibDb, MibName), - NewRoot = delete_mib_from_tree(MibName, Tree#tree.root), - MEs = uninstall_mes(NodeDb, MibName), - uninstall_mib(MibDb, Symbolic, MibName, MEs), - NewMibData = MibData#mib_data{tree = Tree#tree{root = NewRoot}}, - {ok, NewMibData}. - -verify_loaded(Db, Name) -> - case snmpa_general_db:read(Db, Name) of - {value, MibInfo} -> - MibInfo; - false -> - throw({error, 'not loaded'}) - end. - - -close(#mib_data{mib_db = MibDb, node_db = NodeDb, tree_db = TreeDb}) -> - snmpa_general_db:close(MibDb), - snmpa_general_db:close(NodeDb), - snmpa_general_db:close(TreeDb), - ok. - -register_subagent(#mib_data{tree = T} = MibData, Oid, Pid) -> - case insert_subagent(Oid, T#tree.root) of - {error, Reason} -> - {error, Reason}; - NewRootTree -> - SAs = [{Pid, Oid} | MibData#mib_data.subagents], - T2 = T#tree{root = NewRootTree}, - MibData#mib_data{tree = T2, subagents = SAs} - end. - - -%%---------------------------------------------------------------------- -%% Purpose: Get a list of all loaded mibs -%% Returns: [{Name, File}] -%%---------------------------------------------------------------------- - -which_mibs(#mib_data{mib_db = Db}) -> - Mibs = snmpa_general_db:tab2list(Db), - [{Name, File} || #mib_info{name = Name, file_name = File} <- Mibs]. - - -%%---------------------------------------------------------------------- -%% Purpose: Get a list of all loaded mibs -%% Returns: [{Name, File}] -%%---------------------------------------------------------------------- - -whereis_mib(#mib_data{mib_db = Db}, Name) -> - case snmpa_general_db:read(Db, Name) of - {value, #mib_info{file_name = File}} -> - {ok, File}; - false -> - {error, not_found} - end. - - -%%---------------------------------------------------------------------- -%% Purpose: Deletes SA with Pid from all subtrees it handles. -%% Returns: NewMibData. -%%---------------------------------------------------------------------- -unregister_subagent(MibData, Pid) when is_pid(Pid) -> - SAs = MibData#mib_data.subagents, - case lists:keysearch(Pid, 1, SAs) of - false -> MibData; - {value, {Pid, Oid}} -> - % we should never get an error since Oid is found in MibData. - {ok, NewMibData, _DeletedSA} = unregister_subagent(MibData, Oid), - % continue if the same Pid handles other mib subtrees. - unregister_subagent(NewMibData, Pid) - end; - -%%---------------------------------------------------------------------- -%% Purpose: Deletes one unique subagent. -%% Returns: {error, Reason} | {ok, NewMibData, DeletedSubagentPid} -%%---------------------------------------------------------------------- -unregister_subagent(#mib_data{tree = T} = MibData, Oid) when is_list(Oid) -> - case catch delete_subagent(T#tree.root, Oid) of - {tree, Tree, Info} -> - OldSAs = MibData#mib_data.subagents, - {value, {Pid, _Oid}} = lists:keysearch(Oid, 2, OldSAs), - SAs = lists:keydelete(Oid, 2, OldSAs), - T2 = T#tree{root = {tree, Tree, Info}}, - {ok, - MibData#mib_data{tree = T2, subagents = SAs}, - Pid}; - _ -> - {error, {'invalid oid', Oid}} - end. - -%%---------------------------------------------------------------------- -%% Purpose: To inpect memory usage, loaded mibs, registered subagents -%%---------------------------------------------------------------------- -info(MibData) -> - ?vtrace("retrieve info",[]), - #mib_data{mib_db = MibDb, node_db = NodeDb, tree_db = TreeDb, - tree = Tree, subagents = SAs} = MibData, - LoadedMibs = old_format(snmpa_general_db:tab2list(MibDb)), - TreeSize = snmp_misc:mem_size(Tree), - {memory, ProcSize} = erlang:process_info(self(),memory), - MibDbSize = snmpa_general_db:info(MibDb, memory), - NodeDbSize = snmpa_general_db:info(NodeDb, memory), - TreeDbSize = snmpa_general_db:info(TreeDb, memory), - [{loaded_mibs, LoadedMibs}, {subagents, SAs}, {tree_size_bytes, TreeSize}, - {process_memory, ProcSize}, - {db_memory, [{mib,MibDbSize},{node,NodeDbSize},{tree,TreeDbSize}]}]. - -info(#mib_data{mib_db = MibDb}, loaded_mibs) -> - Mibs = snmpa_general_db:tab2list(MibDb), - [filename:rootname(FN, ".bin") || #mib_info{file_name = FN} <- Mibs]; -info(#mib_data{tree = Tree}, tree_size_bytes) -> - snmp_misc:mem_size(Tree); -info(_, process_memory) -> - {memory, ProcSize} = erlang:process_info(self(),memory), - ProcSize; -info(#mib_data{mib_db = MibDb, node_db = NodeDb, tree_db = TreeDb}, - db_memory) -> - MibDbSize = snmpa_general_db:info(MibDb, memory), - NodeDbSize = snmpa_general_db:info(NodeDb, memory), - TreeDbSize = snmpa_general_db:info(TreeDb, memory), - [{mib,MibDbSize},{node,NodeDbSize},{tree,TreeDbSize}]; -info(#mib_data{subagents = SAs}, subagents) -> - SAs. - -old_format(LoadedMibs) -> - ?vtrace("convert mib info to old format",[]), - [{N,S,F} || #mib_info{name=N,symbolic=S,file_name=F} <- LoadedMibs]. - - -%%---------------------------------------------------------------------- -%% A total dump for debugging. -%%---------------------------------------------------------------------- -dump(#mib_data{mib_db = MibDb, node_db = NodeDb, tree = Tree}) -> - (catch io:format("MIB-tables:~n~p~n~n", - [snmpa_general_db:tab2list(MibDb)])), - (catch io:format("MIB-entries:~n~p~n~n", - [snmpa_general_db:tab2list(NodeDb)])), - (catch io:format("Tree:~n~p~n", [Tree])), % good luck reading it! - ok. - -dump(#mib_data{mib_db = MibDb, node_db = NodeDb, tree = Tree}, File) -> - case file:open(File,[write]) of - {ok, Fd} -> - io:format(Fd,"~s~n", - [snmp:date_and_time_to_string(snmp:date_and_time())]), - (catch io:format(Fd,"MIB-tables:~n~p~n~n", - [snmpa_general_db:tab2list(MibDb)])), - (catch io:format(Fd, "MIB-entries:~n~p~n~n", - [snmpa_general_db:tab2list(NodeDb)])), - io:format(Fd,"Tree:~n~p~n", [Tree]), % good luck reading it! - file:close(Fd), - ok; - {error,Reason} -> - ?vinfo("~n Failed opening file '~s' for reason ~p", - [File,Reason]), - {error,Reason} - end. - - -backup(#mib_data{mib_db = M, node_db = N, tree_db = T}, BackupDir) -> - MRes = snmpa_general_db:backup(M, BackupDir), - NRes = snmpa_general_db:backup(N, BackupDir), - TRes = snmpa_general_db:backup(T, BackupDir), - handle_backup_res([{mib_db, MRes}, {node_db, NRes}, {tree_db, TRes}]). - -handle_backup_res(Res) -> - handle_backup_res(Res, []). - -handle_backup_res([], []) -> - ok; -handle_backup_res([], Err) -> - {error, lists:reverse(Err)}; -handle_backup_res([{_, ok}|Res], Err) -> - handle_backup_res(Res, Err); -handle_backup_res([{Tag, {error, Reason}}|Res], Err) -> - handle_backup_res(Res, [{Tag, Reason}|Err]); -handle_backup_res([{Tag, Error}|Res], Err) -> - handle_backup_res(Res, [{Tag, Error}|Err]). - - -%%%====================================================================== -%%% 2. Implementation of tree access -%%% lookup and next. -%%%====================================================================== - - -which_mib(#mib_data{tree = T} = D, Oid) -> - ?vtrace("which_mib -> entry with" - "~n Oid: ~p",[Oid]), - case (catch find_node(D, T#tree.root, Oid, [])) of - {variable, _ME, Mib} -> - ?vtrace("which_mib -> variable:" - "~n Mib: ~p", [Mib]), - {ok, Mib}; - {table, _EntryME, _, Mib} -> - ?vtrace("which_mib -> table:" - "~n Mib: ~p", [Mib]), - {ok, Mib}; - {subagent, SubAgentPid, _SANextOid} -> - ?vtrace("which_mib -> subagent:" - "~n SubAgentPid: ~p", [SubAgentPid]), - {error, {subagent, SubAgentPid}}; - {false, ErrorCode} -> - ?vtrace("which_mib -> false:" - "~n ErrorCode: ~p",[ErrorCode]), - {error, ErrorCode}; - false -> - ?vtrace("which_mib -> false",[]), - {error, noSuchObject}; - {'EXIT', R} -> - ?vtrace("which_mib -> exit:" - "~n R: ~p",[R]), - {error, noSuchObject} - end. - - -%%----------------------------------------------------------------- -%% Func: lookup/2 -%% Purpose: Finds the mib entry corresponding to the Oid. If it is a -%% variable, the Oid must be <Oid for var>.0 and if it is -%% a table, Oid must be <table>.<entry>.<col>.<any> -%% Returns: {variable, MibEntry} | -%% {table_column, MibEntry, TableEntryOid} | -%% {subagent, SubAgentPid, SAOid} | -%% {false, Reason} -%%----------------------------------------------------------------- -lookup(#mib_data{tree = T} = D, Oid) -> - ?vtrace("lookup -> entry with" - "~n Oid: ~p",[Oid]), - case (catch find_node(D, T#tree.root, Oid, [])) of - {variable, ME, _Mib} when is_record(ME, me) -> - ?vtrace("lookup -> variable:" - "~n ME: ~p",[ME]), - {variable, ME}; - {table, EntryME, {ColME, TableEntryOid}, _Mib} -> - ?vtrace("lookup -> table:" - "~n EntryME: ~p" - "~n ColME: ~p" - "~n RevTableEntryOid: ~p", - [EntryME, ColME, TableEntryOid]), - MFA = EntryME#me.mfa, - RetME = ColME#me{mfa = MFA}, - {table_column, RetME, TableEntryOid}; - {subagent, SubAgentPid, SANextOid} -> - ?vtrace("lookup -> subagent:" - "~n SubAgentPid: ~p" - "~n SANextOid: ~p", [SubAgentPid, SANextOid]), - {subagent, SubAgentPid, SANextOid}; - {false, ErrorCode} -> - ?vtrace("lookup -> false:" - "~n ErrorCode: ~p",[ErrorCode]), - {false, ErrorCode}; - false -> - ?vtrace("lookup -> false",[]), - {false, noSuchObject}; - {'EXIT', R} -> - ?vtrace("lookup -> exit:" - "~n R: ~p",[R]), - {false, noSuchObject} - end. - - -find_node(D, {tree, Tree, {table, _}}, RestOfOid, RevOid) -> - ?vtrace("find_node(tree,table) -> entry with" - "~n RestOfOid: ~p" - "~n RevOid: ~p",[RestOfOid, RevOid]), - find_node(D, {tree, Tree, internal}, RestOfOid, RevOid); -find_node(D, {tree, Tree, {table_entry, _}}, RestOfOid, RevOid) -> - ?vtrace("find_node(tree,table_entry) -> entry with" - "~n RestOfOid: ~p" - "~n RevOid: ~p",[RestOfOid, RevOid]), - #mib_data{node_db = Db} = D, - Oid = lists:reverse(RevOid), - case snmpa_general_db:read(Db, Oid) of - {value, #node_info{me = ME, mib_name = Mib}} -> - case find_node(D, {tree, Tree, internal}, RestOfOid, RevOid) of - {false, ErrorCode} -> {false, ErrorCode}; - Val -> {table, ME, Val, Mib} - end; - false -> - ?vinfo("find_node -> could not find table_entry ME with" - "~n RevOid: ~p" - "~n when" - "~n RestOfOid: ~p", - [RevOid, RestOfOid]), - false - end; -find_node(D, {tree, Tree, _Internal}, [Int | RestOfOid], RevOid) -> - ?vtrace("find_node(tree) -> entry with" - "~n Int: ~p" - "~n RestOfOid: ~p" - "~n RevOid: ~p",[Int, RestOfOid, RevOid]), - find_node(D, element(Int+1, Tree), RestOfOid, [Int | RevOid]); -find_node(D, {node, {table_column, _}}, RestOfOid, [ColInt | RevOid]) -> - ?vtrace("find_node(tree,table_column) -> entry with" - "~n RestOfOid: ~p" - "~n ColInt: ~p" - "~n RevOid: ~p",[RestOfOid, ColInt, RevOid]), - #mib_data{node_db = Db} = D, - Oid = lists:reverse([ColInt | RevOid]), - case snmpa_general_db:read(Db, Oid) of - {value, #node_info{me = ME}} -> - {ME, lists:reverse(RevOid)}; - false -> - X = snmpa_general_db:read(Db, lists:reverse([ColInt | RevOid])), - ?vinfo("find_node -> could not find table_column ME with" - "~n RevOid: ~p" - "~n trying [~p|~p]" - "~n X: ~p", - [RevOid, [ColInt | RevOid], X]), - false - end; -find_node(D, {node, {variable, _MibName}}, [0], RevOid) -> - ?vtrace("find_node(tree,variable,[0]) -> entry with" - "~n RevOid: ~p",[RevOid]), - #mib_data{node_db = Db} = D, - Oid = lists:reverse(RevOid), - %% {value, #node_info{me = ME}} = snmpa_general_db:read(Db, Oid), - case snmpa_general_db:read(Db, Oid) of - {value, #node_info{me = ME, mib_name = Mib}} -> - {variable, ME, Mib}; - false -> - ?vinfo("find_node -> could not find variable ME with" - "~n RevOid: ~p", [RevOid]), - false - end; -find_node(_D, {node, {variable, _MibName}}, [], _RevOid) -> - ?vtrace("find_node(tree,variable,[]) -> entry",[]), - {false, noSuchObject}; -find_node(_D, {node, {variable, _MibName}}, _, _RevOid) -> - ?vtrace("find_node(tree,variable) -> entry",[]), - {false, noSuchInstance}; -find_node(D, {node, subagent}, _RestOfOid, SARevOid) -> - ?vtrace("find_node(tree,subagent) -> entry with" - "~n SARevOid: ~p",[SARevOid]), - #mib_data{subagents = SAs} = D, - SAOid = lists:reverse(SARevOid), - case lists:keysearch(SAOid, 2, SAs) of - {value, {SubAgentPid, SAOid}} -> - {subagent, SubAgentPid, SAOid}; - false -> - ?vinfo("find_node -> could not find subagent with" - "~n SAOid: ~p" - "~n SAs: ~p", [SAOid, SAs]), - false - end; -find_node(_D, Node, _RestOfOid, _RevOid) -> - ?vtrace("find_node -> failed:~n~p",[Node]), - {false, noSuchObject}. - - -%%----------------------------------------------------------------- -%% Func: next/3 -%% Purpose: Finds the lexicographically next oid. -%% Returns: endOfMibView | -%% {subagent, SubAgentPid, SAOid} | -%% {variable, MibEntry, VarOid} | -%% {table, TableOid, TableRestOid, MibEntry} -%% If a variable is returnes, it is in the MibView. -%% If a table or subagent is returned, it *may* be in the MibView. -%%----------------------------------------------------------------- -next(#mib_data{tree = T} = D, Oid, MibView) -> - case catch next_node(D, T#tree.root, Oid, [], MibView) of - false -> endOfMibView; - Else -> Else - end. - -%%----------------------------------------------------------------- -%% This function is used as long as we have any Oid left. Take -%% one integer at a time from the Oid, and traverse the tree -%% accordingly. When the Oid is empty, call find_next. -%% Returns: {subagent, SubAgentPid, SAOid} | -%% false | -%% {variable, MibEntry, VarOid} | -%% {table, TableOid, TableRestOid, MibEntry} -%%----------------------------------------------------------------- -next_node(_D, undefined_node, _Oid, _RevOidSoFar, _MibView) -> - ?vtrace("next_node(undefined_node) -> entry", []), - false; - -next_node(_D, {tree, Tree, {table_entry, _Id}}, [Int | _Oid], - _RevOidSoFar, _MibView) - when Int+1 > size(Tree) -> - ?vtrace("next_node(tree,table_entry) -> entry when not found whith" - "~n Int: ~p" - "~n size(Tree): ~p", [Int, size(Tree)]), - false; -next_node(D, {tree, Tree, {table_entry, _MibName}}, - Oid, RevOidSoFar, MibView) -> - ?vtrace("next_node(tree,table_entry) -> entry when" - "~n size(Tree): ~p" - "~n Oid: ~p" - "~n RevOidSoFar: ~p" - "~n MibView: ~p", [size(Tree), Oid, RevOidSoFar, MibView]), - OidSoFar = lists:reverse(RevOidSoFar), - case snmpa_acm:is_definitely_not_in_mib_view(OidSoFar, MibView) of - true -> - ?vdebug("next_node(tree,table_entry) -> not in mib view",[]), - false; - _ -> - #mib_data{node_db = Db} = D, - case snmpa_general_db:read(Db, OidSoFar) of - false -> - ?vinfo("next_node -> could not find table_entry with" - "~n OidSoFar: ~p", [OidSoFar]), - false; - {value, #node_info{me = ME}} -> - ?vtrace("next_node(tree,table_entry) -> found: ~n ~p", - [ME]), - {table, OidSoFar, Oid, ME} - end - end; - -next_node(D, {tree, Tree, _Info}, [Int | RestOfOid], RevOidSoFar, MibView) - when (Int < size(Tree)) andalso (Int >= 0) -> - ?vtrace("next_node(tree) -> entry when" - "~n size(Tree): ~p" - "~n Int: ~p" - "~n RestOfOid: ~p" - "~n RevOidSoFar: ~p" - "~n MibView: ~p", - [size(Tree), Int, RestOfOid, RevOidSoFar, MibView]), - case next_node(D, element(Int+1,Tree), - RestOfOid, [Int|RevOidSoFar], MibView) of - false -> - find_next(D, {tree, Tree, _Info}, Int+1, RevOidSoFar, MibView); - Else -> - Else - end; -%% no solution -next_node(D, {tree, Tree, _Info}, [], RevOidSoFar, MibView) -> - ?vtrace("next_node(tree,[]) -> entry when" - "~n size(Tree): ~p" - "~n RevOidSoFar: ~p" - "~n MibView: ~p", - [size(Tree), RevOidSoFar, MibView]), - find_next(D, {tree, Tree, _Info}, 0, RevOidSoFar, MibView); -next_node(_D, {tree, Tree, _Info}, _RestOfOid, _RevOidSoFar, _MibView) -> - ?vtrace("next_node(tree) -> entry when" - "~n size(Tree): ~p", [size(Tree)]), - false; - -next_node(D, {node, subagent}, Oid, RevOidSoFar, MibView) -> - ?vtrace("next_node(node,subagent) -> entry when" - "~n Oid: ~p" - "~n RevOidSoFar: ~p" - "~n MibView: ~p", - [Oid, RevOidSoFar, MibView]), - OidSoFar = lists:reverse(RevOidSoFar), - case snmpa_acm:is_definitely_not_in_mib_view(OidSoFar, MibView) of - true -> - false; - _ -> - #mib_data{subagents = SAs} = D, - case lists:keysearch(OidSoFar, 2, SAs) of - {value, {SubAgentPid, OidSoFar}} -> - {subagent, SubAgentPid, OidSoFar}; - _ -> - ?vinfo("next_node -> could not find subagent with" - "~n OidSoFar: ~p" - "~n SAs: ~p", [OidSoFar, SAs]), - false - end - end; - -next_node(D, {node, {variable, _MibName}}, [], RevOidSoFar, MibView) -> - ?vtrace("next_node(node,variable,[]) -> entry when" - "~n RevOidSoFar: ~p" - "~n MibView: ~p", - [RevOidSoFar, MibView]), - OidSoFar = lists:reverse([0 | RevOidSoFar]), - case snmpa_acm:validate_mib_view(OidSoFar, MibView) of - true -> - #mib_data{node_db = Db} = D, - case snmpa_general_db:read(Db, lists:reverse(RevOidSoFar)) of - false -> - ?vinfo("next_node -> could not find variable with" - "~n RevOidSoFar: ~p", [RevOidSoFar]), - false; - {value, #node_info{me = ME}} -> - {variable, ME, OidSoFar} - end; - _ -> - false - end; - -next_node(_D, {node, {variable, _MibName}}, _Oid, _RevOidSoFar, _MibView) -> - ?vtrace("next_node(node,variable) -> entry", []), - false. - -%%----------------------------------------------------------------- -%% This function is used to find the first leaf from where we -%% are. -%% Returns: {subagent, SubAgentPid, SAOid} | -%% false | -%% {variable, MibEntry, VarOid} | -%% {table, TableOid, TableRestOid, MibEntry} -%% PRE: This function must always be called with a {internal, Tree} -%% node. -%%----------------------------------------------------------------- -find_next(D, {tree, Tree, internal}, Idx, RevOidSoFar, MibView) - when Idx < size(Tree) -> - case find_next(D, element(Idx+1, Tree), 0, [Idx| RevOidSoFar], MibView) of - false -> - find_next(D, {tree, Tree, internal}, Idx+1, RevOidSoFar, MibView); - Other -> - Other - end; -find_next(_D, {tree, _Tree, internal}, _Idx, _RevOidSoFar, _MibView) -> - false; -find_next(_D, undefined_node, _Idx, _RevOidSoFar, _MibView) -> - false; -find_next(D, {tree, Tree, {table, _MibName}}, Idx, RevOidSoFar, MibView) -> - find_next(D, {tree, Tree, internal}, Idx, RevOidSoFar, MibView); -find_next(D, {tree, _Tree, {table_entry, _MibName}}, _Index, - RevOidSoFar, MibView) -> - OidSoFar = lists:reverse(RevOidSoFar), - case snmpa_acm:is_definitely_not_in_mib_view(OidSoFar, MibView) of - true -> - false; - _ -> - #mib_data{node_db = Db} = D, - case snmpa_general_db:read(Db, OidSoFar) of - false -> - ?vinfo("find_next -> could not find table_entry ME with" - "~n OidSoFar: ~p", [OidSoFar]), - false; - {value, #node_info{me = ME}} -> - {table, OidSoFar, [], ME} - end - end; -find_next(D, {node, {variable, _MibName}}, _Idx, RevOidSoFar, MibView) -> - OidSoFar = lists:reverse([0 | RevOidSoFar]), - case snmpa_acm:validate_mib_view(OidSoFar, MibView) of - true -> - #mib_data{node_db = Db} = D, - case snmpa_general_db:read(Db, lists:reverse(RevOidSoFar)) of - false -> - ?vinfo("find_next -> could not find variable with" - "~n RevOidSoFar: ~p", [RevOidSoFar]), - false; - {value, #node_info{me = ME}} -> - {variable, ME, OidSoFar} - end; - _ -> - false - end; -find_next(D, {node, subagent}, _Idx, RevOidSoFar, MibView) -> - OidSoFar = lists:reverse(RevOidSoFar), - case snmpa_acm:is_definitely_not_in_mib_view(OidSoFar, MibView) of - true -> - false; - _ -> - #mib_data{subagents = SAs} = D, - case lists:keysearch(OidSoFar, 2, SAs) of - {value, {SubAgentPid, OidSoFar}} -> - {subagent, SubAgentPid, OidSoFar}; - false -> - ?vinfo("find_node -> could not find subagent with" - "~n OidSoFar: ~p" - "~n SAs: ~p", [OidSoFar, SAs]), - false - end - end. - -%%%====================================================================== -%%% 3. Tree building functions -%%% Used when loading mibs. -%%%====================================================================== - -build_tree(Mes, MibName) -> - ?d("build_tree -> " - "~n Mes: ~p", [Mes]), - {ListTree, []} = build_subtree([], Mes, MibName), - {tree, convert_tree(ListTree), internal}. - -%%---------------------------------------------------------------------- -%% Purpose: Builds the tree where all oids have prefix equal to LevelPrefix. -%% Returns: {Tree, RestMes} -%% RestMes are Mes that should not be in this subtree. -%% The Tree is a temporary and simplified data structure that is easy to -%% convert to the final tuple tree used by the MIB process. -%% A Node is represented as in the final tree. -%% The tree is not represented as a N-tuple, but as an Index-list. -%% Example: Temporary: [{1, Node1}, {3, Node3}] -%% Final: {Node1, undefined_node, Node3} -%% Pre: Mes are sorted on oid. -%%---------------------------------------------------------------------- -build_subtree(LevelPrefix, [Me | Mes], MibName) -> - ?vtrace("build subtree -> ~n" - " oid: ~p~n" - " LevelPrefix: ~p~n" - " MibName: ~p", [Me#me.oid, LevelPrefix, MibName]), - EType = Me#me.entrytype, - ?vtrace("build subtree -> EType = ~p",[EType]), - case in_subtree(LevelPrefix, Me) of - above -> - ?vtrace("build subtree -> above",[]), - {[], [Me|Mes]}; - {node, Index} -> - ?vtrace("build subtree -> node at ~p",[Index]), - {Tree, RestMes} = build_subtree(LevelPrefix, Mes, MibName), - {[{Index, {node, {EType, MibName}}} | Tree], RestMes}; - {subtree, Index, NewLevelPrefix} -> - ?vtrace("build subtree -> subtree at" - "~n ~w with ~w", - [Index, NewLevelPrefix]), - {BelowTree, RestMes} = - build_subtree(NewLevelPrefix, Mes, MibName), - {CurTree, RestMes2} = - build_subtree(LevelPrefix, RestMes, MibName), - {[{Index, {tree, BelowTree, {EType,MibName}}}| CurTree], RestMes2}; - {internal_subtree, Index, NewLevelPrefix} -> - ?vtrace("build subtree -> internal_subtree at" - "~n ~w with ~w", - [Index,NewLevelPrefix]), - {BelowTree, RestMes} = - build_subtree(NewLevelPrefix, [Me | Mes], MibName), - {CurTree, RestMes2} = - build_subtree(LevelPrefix, RestMes, MibName), - {[{Index, {tree, BelowTree, internal}} | CurTree], RestMes2} - end; - -build_subtree(_LevelPrefix, [], _MibName) -> - ?vtrace("build subtree -> done", []), - {[], []}. - -%%-------------------------------------------------- -%% Purpose: Determine how/if/where Me should be inserted in subtree -%% with LevelPrefix. This function does not build any tree, only -%% determinses what should be done (by build subtree). -%% Returns: -%% above - Indicating that this ME should _not_ be in this subtree. -%% {node, Index} - yes, construct a node with index Index on this level -%% {internal_subtree, Index, NewLevelPrefix} - yes, there should be an -%% internal subtree at this index. -%% {subtree, Index, NewLevelPrefix} - yes, construct a subtree with -%% NewLevelPrefix and insert this on current level in position Index. -%%-------------------------------------------------- -in_subtree(LevelPrefix, Me) -> - case lists:prefix(LevelPrefix, Me#me.oid) of - true when length(Me#me.oid) > length(LevelPrefix) -> - classify_how_in_subtree(LevelPrefix, Me); - _ -> - above - end. - -%%-------------------------------------------------- -%% See comment about in_subtree/2. This function takes care of all cases -%% where the ME really should be in _this_ subtree (not above). -%%-------------------------------------------------- -classify_how_in_subtree(LevelPrefix, Me) - when (length(Me#me.oid) =:= (length(LevelPrefix) + 1)) -> - Oid = Me#me.oid, - case node_or_subtree(Me#me.entrytype) of - subtree -> - {subtree, lists:last(Oid), Oid}; - node -> - {node, lists:last(Oid)} - end; - -classify_how_in_subtree(LevelPrefix, Me) - when (length(Me#me.oid) > (length(LevelPrefix) + 1)) -> - L1 = length(LevelPrefix) + 1, - Oid = Me#me.oid, - {internal_subtree, lists:nth(L1, Oid), lists:sublist(Oid, 1, L1)}. - -%%-------------------------------------------------- -%% Determines how to treat different kinds om MEs in the tree building process. -%% Pre: all internal nodes have been removed. -%%-------------------------------------------------- -node_or_subtree(table) -> subtree; -node_or_subtree(table_entry) -> subtree; -node_or_subtree(variable) -> node; -node_or_subtree(table_column) -> node. - -%%-------------------------------------------------- -%% Purpose: (Recursively) Converts a temporary tree (see above) to a final tree. -%% If input is a ListTree, output is a TupleTree. -%% If input is a Node, output is the same Node. -%% Pre: All Indexes are >= 0. -%%-------------------------------------------------- -convert_tree({Index, {tree, Tree, Info}}) when Index >= 0 -> - L = lists:map(fun convert_tree/1, Tree), - {Index, {tree, dict_list_to_tuple(L), Info}}; -convert_tree({Index, {node, Info}}) when Index >= 0 -> - {Index, {node, Info}}; -convert_tree(Tree) when is_list(Tree) -> - L = lists:map(fun convert_tree/1, Tree), - dict_list_to_tuple(L). - -%%---------------------------------------------------------------------- -%% Purpose: Converts a single level (that is non-recursively) from -%% the temporary indexlist to the N-tuple. -%% Input: A list of {Index, Data}. -%% Output: A tuple where element Index is Data. -%%---------------------------------------------------------------------- -dict_list_to_tuple(L) -> - L2 = lists:keysort(1, L), - list_to_tuple(integrate_indexes(0, L2)). - -%%---------------------------------------------------------------------- -%% Purpose: Helper function for dict_list_to_tuple/1. -%% Converts an indexlist to a N-list. -%% Input: A list of {Index, Data}. -%% Output: A (usually longer, never shorter) list where element Index is Data. -%% Example: [{1,hej}, {3, sven}] will give output -%% [undefined_node, hej, undefined_node, sven]. -%% Initially CurIndex should be 0. -%%---------------------------------------------------------------------- -integrate_indexes(CurIndex, [{CurIndex, Data} | T]) -> - [Data | integrate_indexes(CurIndex + 1, T)]; -integrate_indexes(_Index, []) -> - []; -integrate_indexes(CurIndex, L) -> - [undefined_node | integrate_indexes(CurIndex + 1, L)]. - -%%%====================================================================== -%%% 4. Tree merging -%%% Used by: load mib, insert subagent. -%%%====================================================================== - -%%---------------------------------------------------------------------- -%% Arg: Two root nodes (that is to be merged). -%% Returns: A new root node where the nodes have been merger to one. -%%---------------------------------------------------------------------- -merge_nodes(Same, Same) -> - Same; -merge_nodes(Node, undefined_node) -> - Node; -merge_nodes(undefined_node, Node) -> - Node; -merge_nodes({tree, Tree1, internal}, {tree, Tree2, internal}) -> - {tree, merge_levels(tuple_to_list(Tree1),tuple_to_list(Tree2)), internal}; -merge_nodes(Node1, Node2) -> - throw({error_merge_nodes, Node1, Node2}). - -%%---------------------------------------------------------------------- -%% Arg: Two levels to be merged. -%% Here, a level is represented as a list of nodes. A list is easier -%% to extend than a tuple. -%% Returns: The resulting, merged level tuple. -%%---------------------------------------------------------------------- -merge_levels(Level1, Level2) when length(Level1) =:= length(Level2) -> - MergeNodes = fun(N1, N2) -> merge_nodes(N1, N2) end, - list_to_tuple(snmp_misc:multi_map(MergeNodes, [Level1, Level2])); -merge_levels(Level1, Level2) when length(Level1) > length(Level2) -> - merge_levels(Level1, Level2 ++ - undefined_nodes_list(length(Level1) - length(Level2))); -merge_levels(Level1, Level2) when length(Level1) < length(Level2) -> - merge_levels(Level2, Level1). - -undefined_nodes_list(N) -> lists:duplicate(N, undefined_node). - - -%%%====================================================================== -%%% 5. Tree deletion routines -%%% (for unload mib) -%%%====================================================================== - -%%---------------------------------------------------------------------- -%% Purpose: Actually kicks of the tree reconstruction. -%% Returns: {list of removed MEs, NewTree} -%%---------------------------------------------------------------------- -delete_mib_from_tree(MibName, {tree, Tree, internal}) -> - case delete_tree(Tree, MibName) of - [] -> - {tree, {undefined_node}, internal}; % reduce - LevelList -> - {tree, list_to_tuple(LevelList), internal} - end. - -%%---------------------------------------------------------------------- -%% Purpose: Deletes all nodes associated to MibName from this level and -%% all levels below. -%% If the new level does not contain information (that is, no -%% other mibs use it) anymore the empty list is returned. -%% Returns: {MEs, The new level represented as a list} -%%---------------------------------------------------------------------- -delete_tree(Tree, MibName) when is_tuple(Tree) -> - NewLevel = delete_nodes(tuple_to_list(Tree), MibName, []), - case lists:filter(fun drop_undefined_nodes/1,NewLevel) of - [] -> []; - _A_perhaps_shorted_list -> - NewLevel % some other mib needs this level - end. - -%%---------------------------------------------------------------------- -%% Purpose: Nodes belonging to MibName are removed from the tree. -%% Recursively deletes sub trees to this node. -%% Returns: {MEs, NewNodesList} -%%---------------------------------------------------------------------- -delete_nodes([], _MibName, AccNodes) -> - lists:reverse(AccNodes); - -delete_nodes([{node, {variable, MibName}}|T], MibName, AccNodes) -> - delete_nodes(T, MibName, [undefined_node | AccNodes]); - -delete_nodes([{node, {table_column, MibName}}|T], MibName, AccNodes) -> - delete_nodes(T, MibName, [undefined_node | AccNodes]); - -delete_nodes([{tree, _Tree, {table, MibName}}|T], MibName, AccNodes) -> - delete_nodes(T, MibName, [undefined_node | AccNodes]); - -delete_nodes([{tree, _Tree, {table_entry, MibName}}|T], MibName, AccNodes) -> - delete_nodes(T, MibName, [undefined_node | AccNodes]); - -delete_nodes([{tree, Tree, Info}|T], MibName, AccNodes) -> - case delete_tree(Tree, MibName) of - [] -> % tree completely deleted - delete_nodes(T, MibName, [undefined_node | AccNodes]); - LevelList -> - delete_nodes(T, MibName, - [{tree, list_to_tuple(LevelList), Info} | AccNodes]) - end; - -delete_nodes([NodeToKeep|T], MibName, AccNodes) -> - delete_nodes(T, MibName, [NodeToKeep | AccNodes]). - -drop_undefined_nodes(undefined_node) -> false; -drop_undefined_nodes(_) -> true. - - -%%%====================================================================== -%%% 6. Functions for subagent handling -%%%====================================================================== - -%%---------------------------------------------------------------------- -%% Returns: A new Root|{error, reason} -%%---------------------------------------------------------------------- -insert_subagent(Oid, OldRoot) -> - ListTree = build_tree_for_subagent(Oid), - case catch convert_tree(ListTree) of - {'EXIT', _Reason} -> - {error, 'cannot construct tree from oid'}; - Level when is_tuple(Level) -> - T = {tree, Level, internal}, - case catch merge_nodes(T, OldRoot) of - {error_merge_nodes, _Node1, _Node2} -> - {error, oid_conflict}; - NewRoot when is_tuple(NewRoot) andalso - (element(1, NewRoot) =:= tree) -> - NewRoot - end - end. - -build_tree_for_subagent([Index]) -> - [{Index, {node, subagent}}]; - -build_tree_for_subagent([Index | T]) -> - [{Index, {tree, build_tree_for_subagent(T), internal}}]. +-type mib_view() :: [mib_view_elem()]. +-type mib_view_elem() :: {SubTree :: snmp:oid(), + Mask :: [non_neg_integer()], + Inclusion :: mib_view_inclusion()}. +-type mib_view_mask() :: [non_neg_integer()]. +-type mib_view_inclusion() :: 1 | 2. % 1 = included, 2 = excluded -%%---------------------------------------------------------------------- -%% Returns: A new tree where the subagent at Oid (2nd arg) has been deleted. -%%---------------------------------------------------------------------- -delete_subagent({tree, Tree, Info}, [Index]) -> - {node, subagent} = element(Index+1, Tree), - {tree, setelement(Index+1, Tree, undefined_node), Info}; -delete_subagent({tree, Tree, Info}, [Index | TI]) -> - {tree, setelement(Index+1, Tree, - delete_subagent(element(Index+1, Tree), TI)), Info}. +-type filename() :: file:filename(). -%%%====================================================================== -%%% 7. Misc functions -%%%====================================================================== -%%---------------------------------------------------------------------- -%% Installs the mibs found in the database when starting the agent. -%% Basically calls the instrumentation functions for all non-internal -%% mib-entries -%%---------------------------------------------------------------------- -install_mibs(MibDb, NodeDb) -> - MibNames = loaded(MibDb), - ?vtrace("install_mibs -> found following mibs in database: ~n" - "~p", [MibNames]), - install_mibs2(NodeDb, MibNames). +-callback new(MibStorage :: snmpa:mib_storage()) -> State :: term(). -install_mibs2(_, []) -> - ok; -install_mibs2(NodeDb, [MibName|MibNames]) -> - Pattern = #node_info{oid = '_', mib_name = MibName, me = '_'}, - Nodes = snmpa_general_db:match_object(NodeDb, Pattern), - MEs = [ME || #node_info{me = ME} <- Nodes], - ?vtrace("install_mibs2 -> installing ~p MEs for mib ~p", - [length(MEs),MibName]), - NewF = fun(ME) -> call_instrumentation(ME, new) end, - lists:foreach(NewF, MEs), - install_mibs2(NodeDb, MibNames). - - -%%---------------------------------------------------------------------- -%% Does all side effect stuff during load_mib. -%%---------------------------------------------------------------------- -install_mib(Db, Symbolic, Mib, MibName, FileName, NonInternalMes) -> - ?vdebug("install_mib -> entry with" - "~n Symbolic: ~p" - "~n MibName: ~p" - "~n FileName: ~p", [Symbolic, MibName, FileName]), - Rec = #mib_info{name = MibName, symbolic = Symbolic, file_name = FileName}, - snmpa_general_db:write(Db, Rec), - install_mib2(Symbolic, MibName, Mib), - NewF = fun(ME) -> call_instrumentation(ME, new) end, - lists:foreach(NewF, NonInternalMes). +-callback close(State :: term()) -> ok. -install_mib2(true, MibName, Mib) -> - #mib{table_infos = TabInfos, - variable_infos = VarInfos, - mes = MEs, - asn1_types = ASN1Types, - traps = Traps} = Mib, - snmpa_symbolic_store:add_table_infos(MibName, TabInfos), - snmpa_symbolic_store:add_variable_infos(MibName, VarInfos), - snmpa_symbolic_store:add_aliasnames(MibName, MEs), - snmpa_symbolic_store:add_types(MibName, ASN1Types), - SetF = fun(Trap) -> - snmpa_symbolic_store:set_notification(Trap, MibName) - end, - lists:foreach(SetF, Traps); -install_mib2(_, _, _) -> - ok. +-callback sync(State :: term()) -> ok. -install_mes(_Db, _MibName, []) -> - ok; -install_mes(Db, MibName, [ME|MEs]) -> - Node = #node_info{oid = ME#me.oid, mib_name = MibName, me = ME}, - snmpa_general_db:write(Db, Node), - install_mes(Db, MibName, MEs). +-callback load_mib(State :: term(), FileName :: string(), + MeOverride :: boolean(), + TeOverride :: boolean()) -> + {ok, NewState :: term()} | {error, Reason :: already_loaded | term()}. +-callback unload_mib(State :: term(), FileName :: string(), + MeOverride :: boolean(), + TeOverride :: boolean()) -> + {ok, NewState :: term()} | {error, Reason :: not_loaded | term()}. -%%---------------------------------------------------------------------- -%% Does all side effect stuff during unload_mib. -%%---------------------------------------------------------------------- -uninstall_mib(Db, Symbolic, MibName, MEs) -> - ?vtrace("uninstall_mib -> entry with" - "~n Db: ~p" - "~n Symbolic: ~p" - "~n MibName: ~p", [Db, Symbolic, MibName]), - Res = snmpa_general_db:delete(Db, MibName), - ?vtrace("uninstall_mib -> (mib) db delete result: ~p", [Res]), - uninstall_mib2(Symbolic, MibName), - DelF = fun(ME) -> call_instrumentation(ME, delete) end, - lists:foreach(DelF, MEs). +-callback lookup(State :: term(), Oid :: snmp:oid()) -> + {false, Reason :: term()} | + {variable, MibEntry :: snmpa:me()} | + {table_column, MibEntry :: snmpa:me(), TableEntryOid :: snmp:oid()} | + {subagent, SubAgentPid :: pid(), SAOid :: snmp:oid()}. -uninstall_mib2(true, MibName) -> - snmpa_symbolic_store:delete_table_infos(MibName), - snmpa_symbolic_store:delete_variable_infos(MibName), - snmpa_symbolic_store:delete_aliasnames(MibName), - snmpa_symbolic_store:delete_types(MibName), - snmpa_symbolic_store:delete_notifications(MibName); -uninstall_mib2(_, _) -> - ok. +-callback next(State :: term(), Oid :: snmp:oid(), MibView :: mib_view()) -> + endOfView | false | + {subagent, SubAgentPid :: pid(), SAOid :: snmp:oid()} | + {variable, MibEntry :: snmpa:me(), VarOid :: snmp:oid()} | + {table, TableOid :: snmp:oid(), TableRestOid :: snmp:oid(), MibEntry :: snmpa:me()}. -uninstall_mes(Db, MibName) -> - Pattern = #node_info{oid = '_', mib_name = MibName, me = '_'}, - snmpa_general_db:match_delete(Db, Pattern). +-callback register_subagent(State :: term(), + Oid :: snmp:oid(), + Pid :: pid()) -> + {ok, NewState :: term()} | {error, Reason :: term()}. +-callback unregister_subagent(State :: term(), + PidOrOid :: pid() | snmp:oid()) -> + {ok, NewState :: term()} | % When second arg was a pid() + {ok, NewState :: term(), Pid :: pid()} | % When second arg was a oid() + {error, Reason :: term()}. -%%---------------------------------------------------------------------- -%% Create a list of the names of all the loaded mibs -%%---------------------------------------------------------------------- -loaded(Db) -> - [N || #mib_info{name = N} <- snmpa_general_db:tab2list(Db)]. - +-callback dump(State :: term(), Destination :: io | filename()) -> + ok | {error, Reason :: term()}. -%%---------------------------------------------------------------------- -%% Calls MFA-instrumentation with 'new' or 'delete' operation. -%%---------------------------------------------------------------------- -call_instrumentation(#me{entrytype = variable, mfa={M,F,A}}, Operation) -> - ?vtrace("call instrumentation with" - "~n entrytype: variable" - "~n MFA: {~p,~p,~p}" - "~n Operation: ~p", - [M,F,A,Operation]), - catch apply(M, F, [Operation | A]); -call_instrumentation(#me{entrytype = table_entry, mfa={M,F,A}}, Operation) -> - ?vtrace("call instrumentation with" - "~n entrytype: table_entry" - "~n MFA: {~p,~p,~p}" - "~n Operation: ~p", - [M,F,A,Operation]), - catch apply(M, F, [Operation | A]); -call_instrumentation(_ShitME, _Operation) -> - done. +-callback which_mib(State :: term(), Oid :: snmp:oid()) -> + {ok, Mib :: string()} | {error, Reason :: term()}. +-callback which_mibs(State :: term()) -> + [{MibName :: atom(), Filename :: string()}]. -maybe_drop_me(#me{entrytype = internal}) -> false; -maybe_drop_me(#me{entrytype = group}) -> false; -maybe_drop_me(#me{imported = true}) -> false; -maybe_drop_me(_) -> true. +-callback whereis_mib(State :: term(), MibName :: atom()) -> + {ok, Filename :: string()} | {error, Reason :: term()}. +-callback info(State :: term()) -> list(). -%%---------------------------------------------------------------------- -%% Code change functions -%%---------------------------------------------------------------------- +-callback backup(State :: term(), BackupDir :: string()) -> + ok | {error, Reason :: term()}. -code_change(down, State) -> - ?d("code_change(down) -> entry",[]), - State; +-callback code_change(Direction :: up | down, + Vsn :: term(), + Extra :: term(), + State :: term()) -> + NewState :: term(). -code_change(up, State) -> - ?d("code_change(up)",[]), - State; -code_change(_Vsn, State) -> - State. |