aboutsummaryrefslogblamecommitdiffstats
path: root/lib/snmp/src/manager/snmpm.erl
blob: 9cab8f29c23641a271ca35b9b0caa55722615dd7 (plain) (tree)
1
2
3
4
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474


                   
                                                        





















                                                                         

                                                                               

































































                                                                                 


























                                    




                                    









                                    












































































































































































































































































































                                                                              



                                                                  

                                   





























































                                                                              


                                                                 


                                                                       


                                                                  


                                                                      




                                                                      


                                                                             


                                                                          



                                                   



                                                                         

                                   






                                                                            



                                                                            


                                                                 

                                   





                                                                 

                                   















































































































































































































































































































































































































































































































































































































































































































































































































































































































































                                                                                   
%% 
%% %CopyrightBegin%
%% 
%% Copyright Ericsson AB 2004-2010. 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
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%% 
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%% 
%% %CopyrightEnd%
%% 

-module(snmpm).

%%----------------------------------------------------------------------
%% This module implements a simple SNMP manager for Erlang.
%%----------------------------------------------------------------------

%% User interface
%% Avoid warning for local function demonitor/1 clashing with autoimported BIF.
-compile({no_auto_import,[demonitor/1]}).
-export([
	 %% 
	 %% Management API
	 start/0, start/1, 
	 start_link/0, start_link/1, 
	 stop/0, 

	 monitor/0, demonitor/1, 
	 notify_started/1, cancel_notify_started/1, 

	 backup/1, 

	 load_mib/1, unload_mib/1, 
	 which_mibs/0, 
	 name_to_oid/1, oid_to_name/1, oid_to_type/1, 

	 register_user/3, register_user/4, 
	 register_user_monitor/3, register_user_monitor/4, 
	 unregister_user/1, 
	 which_users/0, 

	 register_agent/2, register_agent/3, register_agent/4, 
	 unregister_agent/2, unregister_agent/3,
	 which_agents/0, which_agents/1, 
	 agent_info/2, update_agent_info/4, 
	 
	 register_usm_user/3, unregister_usm_user/2, 
	 which_usm_users/0, which_usm_users/1, 
	 usm_user_info/3, update_usm_user_info/4, 
	 
	 %% 
	 %% Basic SNMP API
	 sync_get/3, sync_get/4, sync_get/5, sync_get/6, 
	 async_get/3, async_get/4, async_get/5, async_get/6, 
	 sync_get_next/3, sync_get_next/4, sync_get_next/5, sync_get_next/6, 
	 async_get_next/3, async_get_next/4, async_get_next/5, async_get_next/6, 
	 sync_set/3, sync_set/4, sync_set/5, sync_set/6, 
	 async_set/3, async_set/4, async_set/5, async_set/6, 
	 sync_get_bulk/5, sync_get_bulk/6, sync_get_bulk/7, sync_get_bulk/8, 
	 async_get_bulk/5, async_get_bulk/6, async_get_bulk/7, async_get_bulk/8, 
	 cancel_async_request/2, 
	 
	 %% 
	 %% Extended SNMP API
	 %% discovery/2, discovery/3, discovery/4, discovery/5, discovery/6, 

	 %% 
	 %% Logging
	 log_to_txt/2, log_to_txt/3, log_to_txt/4,
	 log_to_txt/5, log_to_txt/6, log_to_txt/7, 
	 change_log_size/1,
	 get_log_type/0,
	 set_log_type/1,

	 reconfigure/0,

	 system_start_time/0,
	 sys_up_time/0,

	 info/0, 
	 verbosity/2 
	]).

-export([format_reason/1, format_reason/2]).

%% Backward compatibillity exports
-deprecated({agent_info,        3}).
-deprecated({update_agent_info, 5}).
-deprecated({g,                 3}).
-deprecated({g,                 4}).
-deprecated({g,                 5}).
-deprecated({g,                 6}).
-deprecated({g,                 7}).
-deprecated({ag,                3}).
-deprecated({ag,                4}).
-deprecated({ag,                5}).
-deprecated({ag,                6}).
-deprecated({ag,                7}).
-deprecated({gn,                3}).
-deprecated({gn,                4}).
-deprecated({gn,                5}).
-deprecated({gn,                6}).
-deprecated({gn,                7}).
-deprecated({agn,               3}).
-deprecated({agn,               4}).
-deprecated({agn,               5}).
-deprecated({agn,               6}).
-deprecated({agn,               7}).
-deprecated({gb,                5}).
-deprecated({gb,                6}).
-deprecated({gb,                7}).
-deprecated({gb,                8}).
-deprecated({gb,                9}).
-deprecated({agb,               5}).
-deprecated({agb,               6}).
-deprecated({agb,               7}).
-deprecated({agb,               8}).
-deprecated({agb,               9}).
-deprecated({s,                 3}).
-deprecated({s,                 4}).
-deprecated({s,                 5}).
-deprecated({s,                 6}).
-deprecated({s,                 7}).
-deprecated({as,                3}).
-deprecated({as,                4}).
-deprecated({as,                5}).
-deprecated({as,                6}).
-deprecated({as,                7}).
-export([
	 agent_info/3, update_agent_info/5, 
	 g/3, g/4, g/5, g/6, g/7, 
	 ag/3, ag/4, ag/5, ag/6, ag/7, 
	 gn/3, gn/4, gn/5, gn/6, gn/7, 
	 agn/3, agn/4, agn/5, agn/6, agn/7, 
	 gb/5, gb/6, gb/7, gb/8, gb/9, 
	 agb/5, agb/6, agb/7, agb/8, agb/9, 
	 s/3, s/4, s/5, s/6, s/7, 
	 as/3, as/4, as/5, as/6, as/7
	]).

%% Application internal export
-export([start_link/3, snmpm_start_verify/2, snmpm_start_verify/3]).


-include("snmp_debug.hrl").
-include("snmpm_atl.hrl").
-include("snmp_types.hrl").

-define(DEFAULT_AGENT_PORT, 161).
-define(DEFAULT_CONTEXT,    "").


%% This function is called when the snmp application
%% starts. 
start_link(Opts, normal, []) ->
    start_link(Opts).


simple_conf() ->
    Vsns      = [v1, v2, v3],
    {ok, Cwd} = file:get_cwd(),
    %% Check if the manager config file exist, if not create it
    MgrConf = filename:join(Cwd, "manager.conf"),
    case file:read_file_info(MgrConf) of
	{ok, _} ->
	    ok;
	_ ->
	    ok = snmp_config:write_manager_config(Cwd, "", 
						  [{port, 5000},
						   {engine_id, "mgrEngine"},
						   {max_message_size, 484}])
    end,
    Conf = [{dir, Cwd}, {db_dir, Cwd}],
    [{versions, Vsns}, {config, Conf}].
    
%% Simple start. Start a manager with default values.
start_link() ->
    start_link(simple_conf()).

%% This function is normally not used. Instead the manager is
%% started as a consequence of a call to application:start(snmp)
%% when {snmp, [{manager, Options}]} is present in the
%% node config file.
start_link(Opts) ->
    %% This start the manager top supervisor, which in turn
    %% starts the other processes.
    {ok, _} = snmpm_supervisor:start_link(normal, Opts),
    ok.

%% Simple start. Start a manager with default values.
start() ->
    start(simple_conf()).
    
start(Opts) ->
    %% This start the manager top supervisor, which in turn
    %% starts the other processes.
    {ok, Pid} = snmpm_supervisor:start_link(normal, Opts),
    unlink(Pid),
    ok.

stop() ->
    snmpm_supervisor:stop().


monitor() ->
    erlang:monitor(process, snmpm_supervisor).

demonitor(Ref) ->
    erlang:demonitor(Ref).
	

-define(NOTIFY_START_TICK_TIME, 500).

notify_started(To) when is_integer(To) andalso (To > 0) ->
    spawn_link(?MODULE, snmpm_start_verify, [self(), To]).

cancel_notify_started(Pid) ->
    Pid ! {cancel, self()},
    ok.

snmpm_start_verify(Parent, To) ->
    ?d("starting", []),
    snmpm_start_verify(Parent, monitor(), To).

snmpm_start_verify(Parent, _Ref, To) when (To =< 0) ->
    ?d("timeout", []),
    unlink(Parent),
    Parent ! {snmpm_start_timeout, self()};
snmpm_start_verify(Parent, Ref, To) ->
    T0 = t(),
    receive
	{cancel, Parent} ->
	    ?d("cancel", []),
	    demonitor(Ref),
	    unlink(Parent),
	    exit(normal);
	{'EXIT', Parent, _} ->
	    exit(normal);
	{'DOWN', Ref, process, _Object, _Info} ->
	    ?d("down", []),
	    sleep(?NOTIFY_START_TICK_TIME),
	    ?MODULE:snmpm_start_verify(Parent, monitor(), t(T0, To))
    after ?NOTIFY_START_TICK_TIME ->
	    ?d("down timeout", []),
	    demonitor(Ref),
	    case snmpm_server:is_started() of
		true ->
		    unlink(Parent),
		    Parent ! {snmpm_started, self()};
		_ ->
		    ?MODULE:snmpm_start_verify(Parent, monitor(), t(T0, To))
	    end
    end.

t(T0, T)  -> T - (t() - T0).
t()       -> snmp_misc:now(ms).
sleep(To) -> snmp_misc:sleep(To).


%% -- Misc --

backup(BackupDir) ->
    snmpm_config:backup(BackupDir).


%% -- Mibs --

%% Load a mib into the manager
load_mib(MibFile) ->
    snmpm_server:load_mib(MibFile).

%% Unload a mib from the manager
unload_mib(Mib) ->
    snmpm_server:unload_mib(Mib).

%% Which mib's are loaded
which_mibs() ->
    snmpm_config:which_mibs().

%% Get all the possible oid's for the aliasname
name_to_oid(Name) ->
    snmpm_config:name_to_oid(Name).

%% Get the aliasname for an oid
oid_to_name(Oid) ->
    snmpm_config:oid_to_name(Oid).

%% Get the type for an oid
oid_to_type(Oid) ->
    snmpm_config:oid_to_type(Oid).


%% -- Info -- 

info() ->
    snmpm_server:info().


%% -- Verbosity -- 

%% Change the verbosity of a process in the manager
verbosity(config, V) ->
    snmpm_config:verbosity(V);
verbosity(server, V) ->
    snmpm_server:verbosity(V);
verbosity(net_if, V) ->
    snmpm_server:verbosity(net_if, V);
verbosity(note_store, V) ->
    snmpm_server:verbosity(note_store, V);
verbosity(all, V) ->
    snmpm_config:verbosity(V),
    snmpm_server:verbosity(V),
    snmpm_server:verbosity(net_if, V),
    snmpm_server:verbosity(note_store, V).


%% -- Users --

%% Register the 'user'. 
%% The manager entity responsible for a specific agent. 
%% Module is the callback module (snmpm_user behaviour) which 
%% will be called whenever something happens (detected 
%% agent, incomming reply or incomming trap/notification).
%% Note that this could have already been done as a 
%% consequence of the node config.
register_user(Id, Module, Data) ->
    register_user(Id, Module, Data, []).

%% Default config for agents registered by this user
register_user(Id, Module, Data, DefaultAgentConfig) ->
    snmpm_server:register_user(Id, Module, Data, DefaultAgentConfig).

register_user_monitor(Id, Module, Data) ->
    register_user_monitor(Id, Module, Data, []).

register_user_monitor(Id, Module, Data, DefaultAgentConfig) ->
    snmpm_server:register_user_monitor(Id, Module, Data, DefaultAgentConfig).

unregister_user(Id) ->
    snmpm_server:unregister_user(Id).

which_users() ->
    snmpm_config:which_users().


%% -- Agents --

%% Explicitly instruct the manager to handle this agent.
%% Called to instruct the manager that this agent 
%% shall be handled. These functions is used when
%% the user know's in advance which agents the
%% manager shall handle.
%% Note that there is an alternate way to do the same thing:
%% Add the agent to the manager config files.
%% 
%% UserId     -> Id of the user responsible for this agent: term()
%% TargetName -> Unique name for the agent: (string())
%% Config     -> Agent configuration: [config()]

do_register_agent(UserId, TargetName, Config) ->
    snmpm_config:register_agent(UserId, TargetName, Config).

register_agent(UserId, TargetName, Config) 
  when (is_list(TargetName) andalso 
	(length(TargetName) > 0) andalso 
	is_list(Config)) ->
    do_register_agent(UserId, TargetName, [{reg_type, target_name} | Config]);

%% Backward compatibillity 
%% Note that the agent engine id is a mandatory config option,
%% so this function *will* fail!
register_agent(UserId, Addr, Port) when is_integer(Port) ->
    register_agent(UserId, Addr, Port, []);

%% Backward compatibillity 
register_agent(UserId, Addr, Config) when is_list(Config) ->
    register_agent(UserId, Addr, ?DEFAULT_AGENT_PORT, Config).

%% Backward compatibillity 
%% Note that the agent engine id is a mandatory config option,
%% so this function *will* fail!
register_agent(UserId, Addr) ->
    register_agent(UserId, Addr, ?DEFAULT_AGENT_PORT, []).

%% Backward compatibillity 
register_agent(UserId, Addr, Port, Config0) ->
    case lists:keymember(target_name, 1, Config0) of
	false ->
	    TargetName = mk_target_name(Addr, Port, Config0), 
	    Config     = [{reg_type, addr_port}, 
			  {address, Addr}, {port, Port} | Config0], 
	    do_register_agent(UserId, TargetName, ensure_engine_id(Config));
	true ->
	    {value, {_, TargetName}} = 
		lists:keysearch(target_name, 1, Config0),
	    Config1 = lists:keydelete(target_name, 1, Config0),
	    Config2 = [{reg_type, addr_port}, 
		       {address, Addr}, {port, Port} | Config1], 
	    register_agent(UserId, TargetName, ensure_engine_id(Config2))
    end.

unregister_agent(UserId, TargetName) when is_list(TargetName) ->
    snmpm_config:unregister_agent(UserId, TargetName);

%% Backward compatibillity functions
unregister_agent(UserId, Addr) ->
    unregister_agent(UserId, Addr, ?DEFAULT_AGENT_PORT).

unregister_agent(UserId, Addr, Port) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    unregister_agent(UserId, TargetName);
	Error ->
	    Error
    end.

agent_info(TargetName, Item) ->
    snmpm_config:agent_info(TargetName, Item).

%% Backward compatibillity
agent_info(Addr, Port, Item) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    agent_info(TargetName, Item);
	Error ->
	    Error
    end.

update_agent_info(UserId, TargetName, Item, Val) ->
    snmpm_config:update_agent_info(UserId, TargetName, Item, Val).

%% Backward compatibillity functions
update_agent_info(UserId, Addr, Port, Item, Val) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    update_agent_info(UserId, TargetName, Item, Val);
	Error ->
	    Error
    end.

which_agents() ->
    snmpm_config:which_agents().

which_agents(UserId) ->
    snmpm_config:which_agents(UserId).


%% -- USM users --

register_usm_user(EngineID, UserName, Conf) 
  when is_list(EngineID) andalso is_list(UserName) andalso is_list(Conf) ->
    snmpm_config:register_usm_user(EngineID, UserName, Conf).

unregister_usm_user(EngineID, UserName) 
  when is_list(EngineID) andalso is_list(UserName) ->
    snmpm_config:unregister_usm_user(EngineID, UserName).

usm_user_info(EngineID, UserName, Item) 
  when is_list(EngineID) andalso is_list(UserName) andalso is_atom(Item) ->
    snmpm_config:usm_user_info(EngineID, UserName, Item).

update_usm_user_info(EngineID, UserName, Item, Val) 
  when is_list(EngineID) andalso is_list(UserName) andalso is_atom(Item) ->
    snmpm_config:update_usm_user_info(EngineID, UserName, Item, Val).

which_usm_users() ->
    snmpm_config:which_usm_users().

which_usm_users(EngineID) when is_list(EngineID) ->
    snmpm_config:which_usm_users(EngineID).


%% -- Discovery --

%% Start a discovery process
%% discovery(UserId, BAddr) ->
%%     snmpm_server:discovery(UserId, BAddr).

%% discovery(UserId, BAddr, ExpireOrConfig) ->
%%     snmpm_server:discovery(UserId, BAddr, ExpireOrConfig).

%% discovery(UserId, BAddr, Config, Expire) ->
%%     snmpm_server:discovery(UserId, BAddr, Config, Expire).

%% discovery(UserId, BAddr, Port, Config, Expire) ->
%%     snmpm_server:discovery(UserId, BAddr, Port, Config, Expire).

%% discovery(UserId, BAddr, Port, Config, Expire, ExtraInfo) ->
%%     snmpm_server:discovery(UserId, BAddr, Port, Config, Expire, ExtraInfo).


%% -- Requests --

%% --- synchroneous get-request ---
%% 

sync_get(UserId, TargetName, Oids) ->
    sync_get(UserId, TargetName, ?DEFAULT_CONTEXT, Oids).

sync_get(UserId, TargetName, Context, Oids) when is_list(Oids) ->
    snmpm_server:sync_get(UserId, TargetName, Context, Oids);

sync_get(UserId, TargetName, Oids, Timeout) when is_integer(Timeout) ->
    sync_get(UserId, TargetName, ?DEFAULT_CONTEXT, Oids, Timeout).

sync_get(UserId, TargetName, Context, Oids, Timeout) ->
    snmpm_server:sync_get(UserId, TargetName, Context, Oids, Timeout).

sync_get(UserId, TargetName, Context, Oids, Timeout, ExtraInfo) ->
    snmpm_server:sync_get(UserId, TargetName, Context, Oids, Timeout, 
			  ExtraInfo).


g(UserId, Addr, Oids) ->
    g(UserId, Addr, ?DEFAULT_AGENT_PORT, Oids).

g(UserId, Addr, CtxName, Oids) when is_list(CtxName) andalso is_list(Oids) ->
    g(UserId, Addr, ?DEFAULT_AGENT_PORT, CtxName, Oids);

g(UserId, Addr, Port, Oids) when is_integer(Port) andalso is_list(Oids) ->
    g(UserId, Addr, Port, ?DEFAULT_CONTEXT, Oids);

g(UserId, Addr, Oids, Timeout) 
  when is_list(Oids) andalso is_integer(Timeout) ->
    g(UserId, Addr, ?DEFAULT_AGENT_PORT, Oids, Timeout).

g(UserId, Addr, Port, CtxName, Oids) 
  when is_integer(Port) andalso is_list(CtxName) andalso is_list(Oids) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    sync_get(UserId, TargetName, CtxName, Oids);
	Error ->
	    Error
    end;    
    
g(UserId, Addr, Port, Oids, Timeout) 
  when is_integer(Port) andalso is_list(Oids) andalso is_integer(Timeout) ->
    g(UserId, Addr, Port, ?DEFAULT_CONTEXT, Oids, Timeout);

g(UserId, Addr, CtxName, Oids, Timeout) 
  when is_list(CtxName) andalso is_list(Oids) andalso is_integer(Timeout) ->
    g(UserId, Addr, ?DEFAULT_AGENT_PORT, CtxName, Oids, Timeout).

g(UserId, Addr, Port, CtxName, Oids, Timeout) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    sync_get(UserId, TargetName, CtxName, Oids, Timeout);
	Error ->
	    Error
    end.

g(UserId, Addr, Port, CtxName, Oids, Timeout, ExtraInfo) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    sync_get(UserId, TargetName, CtxName, Oids, Timeout, ExtraInfo);
	Error ->
	    Error
    end.



%% --- asynchroneous get-request ---
%% 
%% The reply will be delivered to the user
%% through a call to handle_pdu/5
%% 

async_get(UserId, TargetName, Oids) ->
    async_get(UserId, TargetName, ?DEFAULT_CONTEXT, Oids).

async_get(UserId, TargetName, Context, Oids) when is_list(Oids) ->
    snmpm_server:async_get(UserId, TargetName, Context, Oids);

async_get(UserId, TargetName, Oids, Expire) when is_integer(Expire) ->
    async_get(UserId, TargetName, ?DEFAULT_CONTEXT, Oids, Expire).

async_get(UserId, TargetName, Context, Oids, Expire) ->
    snmpm_server:async_get(UserId, TargetName, Context, Oids, Expire).

async_get(UserId, TargetName, Context, Oids, Expire, ExtraInfo) ->
    snmpm_server:async_get(UserId, TargetName, Context, Oids, Expire, 
			   ExtraInfo).


ag(UserId, Addr, Oids) ->
    ag(UserId, Addr, ?DEFAULT_AGENT_PORT, Oids).

ag(UserId, Addr, Port, Oids) when is_integer(Port) andalso is_list(Oids) ->
    ag(UserId, Addr, Port, ?DEFAULT_CONTEXT, Oids);

ag(UserId, Addr, CtxName, Oids) when is_list(CtxName) andalso is_list(Oids) ->
    ag(UserId, Addr, ?DEFAULT_AGENT_PORT, CtxName, Oids);

ag(UserId, Addr, Oids, Expire) when is_list(Oids) andalso is_integer(Expire) ->
    ag(UserId, Addr, ?DEFAULT_AGENT_PORT, ?DEFAULT_CONTEXT, Oids, Expire).

ag(UserId, Addr, Port, CtxName, Oids) 
  when is_integer(Port) andalso is_list(CtxName) andalso is_list(Oids) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    async_get(UserId, TargetName, CtxName, Oids);
	Error ->
	    Error
    end;

ag(UserId, Addr, Port, Oids, Expire) 
  when is_integer(Port) andalso is_list(Oids) andalso is_integer(Expire) ->
    ag(UserId, Addr, Port, ?DEFAULT_CONTEXT, Oids, Expire);

ag(UserId, Addr, CtxName, Oids, Expire) 
  when is_list(CtxName) andalso is_list(Oids) andalso is_integer(Expire) ->
    ag(UserId, Addr, ?DEFAULT_AGENT_PORT, CtxName, Oids, Expire).

ag(UserId, Addr, Port, CtxName, Oids, Expire) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    async_get(UserId, TargetName, CtxName, Oids, Expire);
	Error ->
	    Error
    end.

ag(UserId, Addr, Port, CtxName, Oids, Expire, ExtraInfo) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    async_get(UserId, TargetName, CtxName, Oids, Expire, ExtraInfo);
	Error ->
	    Error
    end.



%% --- synchroneous get_next-request ---
%% 

sync_get_next(UserId, TargetName, Oids) ->
    sync_get_next(UserId, TargetName, ?DEFAULT_CONTEXT, Oids).

sync_get_next(UserId, TargetName, Context, Oids) 
  when is_list(Context) andalso is_list(Oids) ->
    snmpm_server:sync_get_next(UserId, TargetName, Context, Oids);

sync_get_next(UserId, TargetName, Oids, Timeout) 
  when is_list(Oids) andalso is_integer(Timeout) ->
    sync_get_next(UserId, TargetName, ?DEFAULT_CONTEXT, Oids, Timeout).

sync_get_next(UserId, TargetName, Context, Oids, Timeout) ->
    snmpm_server:sync_get_next(UserId, TargetName, Context, Oids, Timeout).

sync_get_next(UserId, TargetName, Context, Oids, Timeout, ExtraInfo) ->
    snmpm_server:sync_get_next(UserId, TargetName, Context, Oids, Timeout, 
			       ExtraInfo).


gn(UserId, Addr, Oids) ->
    gn(UserId, Addr, ?DEFAULT_AGENT_PORT, Oids).

gn(UserId, Addr, CtxName, Oids) when is_list(CtxName) andalso is_list(Oids) ->
    gn(UserId, Addr, ?DEFAULT_AGENT_PORT, CtxName, Oids);

gn(UserId, Addr, Port, Oids) when is_integer(Port) andalso is_list(Oids) ->
    gn(UserId, Addr, Port, ?DEFAULT_CONTEXT, Oids);

gn(UserId, Addr, Oids, Timeout) 
  when is_list(Oids) andalso is_integer(Timeout) ->
    gn(UserId, Addr, ?DEFAULT_AGENT_PORT, Oids, Timeout).

gn(UserId, Addr, Port, CtxName, Oids) 
  when is_integer(Port) andalso is_list(CtxName) andalso is_list(Oids) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    sync_get_next(UserId, TargetName, CtxName, Oids);
	Error ->
	    Error
    end;    
	
gn(UserId, Addr, Port, Oids, Timeout) 
  when is_integer(Port) andalso is_list(Oids) andalso is_integer(Timeout) ->
    gn(UserId, Addr, Port, ?DEFAULT_CONTEXT, Oids, Timeout);
gn(UserId, Addr, CtxName, Oids, Timeout) 
  when is_list(CtxName) andalso is_list(Oids) andalso is_integer(Timeout) ->
    gn(UserId, Addr, ?DEFAULT_AGENT_PORT, CtxName, Oids, Timeout).

gn(UserId, Addr, Port, CtxName, Oids, Timeout) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    sync_get_next(UserId, TargetName, CtxName, Oids, Timeout);
	Error ->
	    Error
    end.

gn(UserId, Addr, Port, CtxName, Oids, Timeout, ExtraInfo) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    sync_get_next(UserId, TargetName, CtxName, Oids, Timeout, ExtraInfo);
	Error ->
	    Error
    end.



%% --- asynchroneous get_next-request ---
%% 

async_get_next(UserId, TargetName, Oids) ->
    async_get_next(UserId, TargetName, ?DEFAULT_CONTEXT, Oids).

async_get_next(UserId, TargetName, Context, Oids) 
  when is_list(Context) andalso is_list(Oids) ->
    snmpm_server:async_get_next(UserId, TargetName, Context, Oids);

async_get_next(UserId, TargetName, Oids, Timeout) 
  when is_list(Oids) andalso is_integer(Timeout) ->
    async_get_next(UserId, TargetName, ?DEFAULT_CONTEXT, Oids, Timeout).

async_get_next(UserId, TargetName, Context, Oids, Timeout) ->
    snmpm_server:async_get_next(UserId, TargetName, Context, Oids, Timeout).

async_get_next(UserId, TargetName, Context, Oids, Timeout, ExtraInfo) ->
    snmpm_server:async_get_next(UserId, TargetName, Context, Oids, Timeout, 
				ExtraInfo).

agn(UserId, Addr, Oids) ->
    agn(UserId, Addr, ?DEFAULT_AGENT_PORT, Oids).

agn(UserId, Addr, CtxName, Oids) when is_list(CtxName) andalso is_list(Oids) ->
    agn(UserId, Addr, ?DEFAULT_AGENT_PORT, CtxName, Oids);

agn(UserId, Addr, Port, Oids) when is_integer(Port) andalso is_list(Oids) ->
    agn(UserId, Addr, Port, ?DEFAULT_CONTEXT, Oids);

agn(UserId, Addr, Oids, Expire) 
  when is_list(Oids) andalso is_integer(Expire) ->
    agn(UserId, Addr, ?DEFAULT_AGENT_PORT, Oids, Expire).

agn(UserId, Addr, Port, CtxName, Oids) 
  when is_integer(Port) andalso is_list(CtxName) andalso is_list(Oids) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    async_get_next(UserId, TargetName, CtxName, Oids);
	Error ->
	    Error
    end;    
	
agn(UserId, Addr, Port, Oids, Expire) 
  when is_integer(Port) andalso is_list(Oids) andalso is_integer(Expire) ->
    agn(UserId, Addr, Port, ?DEFAULT_CONTEXT, Oids, Expire);
agn(UserId, Addr, CtxName, Oids, Expire) 
  when is_list(CtxName) andalso is_list(CtxName) andalso is_integer(Expire) ->
    agn(UserId, Addr, ?DEFAULT_AGENT_PORT, CtxName, Oids, Expire).

agn(UserId, Addr, Port, CtxName, Oids, Expire) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    async_get_next(UserId, TargetName, CtxName, Oids, Expire);
	Error ->
	    Error
    end.

agn(UserId, Addr, Port, CtxName, Oids, Expire, ExtraInfo) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    async_get_next(UserId, TargetName, CtxName, Oids, Expire, 
			   ExtraInfo);
	Error ->
	    Error
    end.



%% --- synchroneous set-request ---
%% 

sync_set(UserId, TargetName, VarsAndVals) ->
    sync_set(UserId, TargetName, ?DEFAULT_CONTEXT, VarsAndVals).

sync_set(UserId, TargetName, Context, VarsAndVals) 
  when is_list(Context) andalso is_list(VarsAndVals) ->
    snmpm_server:sync_set(UserId, TargetName, Context, VarsAndVals);

sync_set(UserId, TargetName, VarsAndVals, Timeout) 
  when is_list(VarsAndVals) andalso is_integer(Timeout) ->
    sync_set(UserId, TargetName, ?DEFAULT_CONTEXT, VarsAndVals, Timeout).

sync_set(UserId, TargetName, Context, VarsAndVals, Timeout) ->
    snmpm_server:sync_set(UserId, TargetName, Context, VarsAndVals, Timeout).

sync_set(UserId, TargetName, Context, VarsAndVals, Timeout, ExtraInfo) ->
    snmpm_server:sync_set(UserId, TargetName, Context, VarsAndVals, Timeout, 
			  ExtraInfo).


s(UserId, Addr, VarsAndVals) ->
    s(UserId, Addr, ?DEFAULT_AGENT_PORT, VarsAndVals).

s(UserId, Addr, Port, VarsAndVals) 
  when is_integer(Port) andalso is_list(VarsAndVals) ->
    s(UserId, Addr, Port, ?DEFAULT_CONTEXT, VarsAndVals);

s(UserId, Addr, CtxName, VarsAndVals) 
  when is_list(CtxName) andalso is_list(VarsAndVals) ->
    s(UserId, Addr, ?DEFAULT_AGENT_PORT, CtxName, VarsAndVals);

s(UserId, Addr, VarsAndVals, Timeout) 
  when is_list(VarsAndVals) andalso is_integer(Timeout) ->
    s(UserId, Addr, ?DEFAULT_AGENT_PORT, VarsAndVals, Timeout).

s(UserId, Addr, Port, CtxName, VarsAndVals) 
  when is_integer(Port) andalso 
       is_list(CtxName) andalso 
       is_list(VarsAndVals) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    sync_set(UserId, TargetName, CtxName, VarsAndVals);
	Error ->
	    Error
    end;

s(UserId, Addr, Port, VarsAndVals, Timeout) 
  when is_integer(Port) andalso 
       is_list(VarsAndVals) andalso 
       is_integer(Timeout) ->
    s(UserId, Addr, Port, ?DEFAULT_CONTEXT, VarsAndVals, Timeout);

s(UserId, Addr, CtxName, VarsAndVals, Timeout) 
  when is_list(CtxName) andalso 
       is_list(VarsAndVals) andalso 
       is_integer(Timeout) ->
    s(UserId, Addr, ?DEFAULT_AGENT_PORT, CtxName, VarsAndVals, Timeout).

s(UserId, Addr, Port, CtxName, VarsAndVals, Timeout) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    sync_set(UserId, TargetName, CtxName, VarsAndVals, Timeout);
	Error ->
	    Error
    end.

s(UserId, Addr, Port, CtxName, VarsAndVals, Timeout, ExtraInfo) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    sync_set(UserId, TargetName, CtxName, VarsAndVals, Timeout, ExtraInfo);
	Error ->
	    Error
    end.



%% --- asynchroneous set-request --- 
%% 

async_set(UserId, TargetName, VarsAndVals) ->
    async_set(UserId, TargetName, ?DEFAULT_CONTEXT, VarsAndVals).

async_set(UserId, TargetName, Context, VarsAndVals) 
  when is_list(Context) andalso is_list(VarsAndVals) ->
    snmpm_server:async_set(UserId, TargetName, Context, VarsAndVals);

async_set(UserId, TargetName, VarsAndVals, Expire) 
  when is_list(VarsAndVals) andalso is_integer(Expire) ->
    async_set(UserId, TargetName, ?DEFAULT_CONTEXT, VarsAndVals, Expire).

async_set(UserId, TargetName, Context, VarsAndVals, Expire) ->
    snmpm_server:async_set(UserId, TargetName, Context, VarsAndVals, Expire).

async_set(UserId, TargetName, Context, VarsAndVals, Expire, ExtraInfo) ->
    snmpm_server:async_set(UserId, TargetName, Context, VarsAndVals, Expire, 
			   ExtraInfo).


as(UserId, Addr, VarsAndVals) ->
    as(UserId, Addr, ?DEFAULT_AGENT_PORT, VarsAndVals).

as(UserId, Addr, Port, VarsAndVals) 
  when is_integer(Port) andalso is_list(VarsAndVals) ->
    as(UserId, Addr, Port, ?DEFAULT_CONTEXT, VarsAndVals);

as(UserId, Addr, CtxName, VarsAndVals) 
  when is_list(CtxName) andalso is_list(VarsAndVals) ->
    as(UserId, Addr, ?DEFAULT_AGENT_PORT, CtxName, VarsAndVals);

as(UserId, Addr, VarsAndVals, Expire) 
  when is_list(VarsAndVals) andalso is_integer(Expire) ->
    as(UserId, Addr, ?DEFAULT_AGENT_PORT, VarsAndVals, Expire).

as(UserId, Addr, Port, CtxName, VarsAndVals) 
  when is_integer(Port) andalso 
       is_list(CtxName) andalso 
       is_list(VarsAndVals) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    async_set(UserId, TargetName, CtxName, VarsAndVals);
	Error ->
	    Error
    end;
	
as(UserId, Addr, Port, VarsAndVals, Expire) 
  when is_integer(Port) andalso 
       is_list(VarsAndVals) andalso 
       is_integer(Expire) ->
    as(UserId, Addr, Port, ?DEFAULT_CONTEXT, VarsAndVals, Expire);

as(UserId, Addr, CtxName, VarsAndVals, Expire) 
  when is_list(CtxName) andalso 
       is_list(VarsAndVals) andalso 
       is_integer(Expire) ->
    as(UserId, Addr, ?DEFAULT_AGENT_PORT, CtxName, VarsAndVals, Expire).

as(UserId, Addr, Port, CtxName, VarsAndVals, Expire) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    async_set(UserId, TargetName, CtxName, VarsAndVals, Expire);
	Error ->
	    Error
    end.

as(UserId, Addr, Port, CtxName, VarsAndVals, Expire, ExtraInfo) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    async_set(UserId, TargetName, CtxName, VarsAndVals, Expire, ExtraInfo);
	Error ->
	    Error
    end.




%% --- synchroneous get-bulk ---
%% 

sync_get_bulk(UserId, TargetName, NonRep, MaxRep, Oids) ->
    sync_get_bulk(UserId, TargetName, NonRep, MaxRep, ?DEFAULT_CONTEXT, Oids).

sync_get_bulk(UserId, TargetName, NonRep, MaxRep, Context, Oids) 
  when is_integer(NonRep) andalso 
       is_integer(MaxRep) andalso 
       is_list(Context) andalso 
       is_list(Oids) ->
    snmpm_server:sync_get_bulk(UserId, TargetName, 
			       NonRep, MaxRep, 
			       Context, Oids);

sync_get_bulk(UserId, TargetName, NonRep, MaxRep, Oids, Timeout) 
  when is_integer(NonRep) andalso 
       is_integer(MaxRep) andalso 
       is_list(Oids) andalso 
       is_integer(Timeout) ->
    sync_get_bulk(UserId, TargetName, NonRep, MaxRep, 
		  ?DEFAULT_CONTEXT, Oids, Timeout).

sync_get_bulk(UserId, TargetName, NonRep, MaxRep, Context, Oids, Timeout) ->
    snmpm_server:sync_get_bulk(UserId, TargetName, NonRep, MaxRep, 
			       Context, Oids, Timeout).

sync_get_bulk(UserId, TargetName, NonRep, MaxRep, Context, Oids, Timeout, 
	      ExtraInfo) ->
    snmpm_server:sync_get_bulk(UserId, TargetName, NonRep, MaxRep, 
			       Context, Oids, Timeout, ExtraInfo).


gb(UserId, Addr, NonRep, MaxRep, Oids) ->
    gb(UserId, Addr, ?DEFAULT_AGENT_PORT, NonRep, MaxRep, Oids).

gb(UserId, Addr, Port, NonRep, MaxRep, Oids) 
  when is_integer(Port) andalso 
       is_integer(NonRep) andalso 
       is_integer(MaxRep) andalso 
       is_list(Oids) ->
    gb(UserId, Addr, Port, NonRep, MaxRep, ?DEFAULT_CONTEXT, Oids);

gb(UserId, Addr, NonRep, MaxRep, CtxName, Oids) 
  when is_integer(NonRep) andalso 
       is_integer(MaxRep) andalso 
       is_list(CtxName) andalso 
       is_list(Oids) ->
    gb(UserId, Addr, ?DEFAULT_AGENT_PORT, NonRep, MaxRep, CtxName, Oids);

gb(UserId, Addr, NonRep, MaxRep, Oids, Timeout) 
  when is_integer(NonRep) andalso 
       is_integer(MaxRep) andalso 
       is_list(Oids) andalso 
       is_integer(Timeout) ->
    gb(UserId, Addr, ?DEFAULT_AGENT_PORT, NonRep, MaxRep, Oids, Timeout).

gb(UserId, Addr, Port, NonRep, MaxRep, CtxName, Oids) 
  when is_integer(Port) andalso 
       is_integer(NonRep) andalso 
       is_integer(MaxRep) andalso 
       is_list(CtxName) andalso 
       is_list(Oids) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    sync_get_bulk(UserId, TargetName, NonRep, MaxRep, CtxName, Oids);
	Error ->
	    Error
    end;

gb(UserId, Addr, Port, NonRep, MaxRep, Oids, Timeout) 
  when is_integer(Port) andalso 
       is_integer(NonRep) andalso 
       is_integer(MaxRep) andalso 
       is_list(Oids) andalso 
       is_integer(Timeout) ->
    gb(UserId, Addr, Port, NonRep, MaxRep, ?DEFAULT_CONTEXT, Oids, Timeout);

gb(UserId, Addr, NonRep, MaxRep, CtxName, Oids, Timeout) 
  when is_integer(NonRep) andalso 
       is_integer(MaxRep) andalso 
       is_list(CtxName) andalso 
       is_list(Oids) andalso 
       is_integer(Timeout) ->
    gb(UserId, Addr, ?DEFAULT_AGENT_PORT, NonRep, MaxRep, CtxName, Oids, 
       Timeout).

gb(UserId, Addr, Port, NonRep, MaxRep, CtxName, Oids, Timeout) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    sync_get_bulk(UserId, TargetName, 
			  NonRep, MaxRep, CtxName, Oids, Timeout);
	Error ->
	    Error
    end.

gb(UserId, Addr, Port, NonRep, MaxRep, CtxName, Oids, Timeout, ExtraInfo) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    sync_get_bulk(UserId, TargetName, 
			  NonRep, MaxRep, CtxName, Oids, Timeout, ExtraInfo);
	Error ->
	    Error
    end.



%% --- asynchroneous get-bulk ---
%% 

async_get_bulk(UserId, TargetName, NonRep, MaxRep, Oids) ->
    async_get_bulk(UserId, TargetName, NonRep, MaxRep, ?DEFAULT_CONTEXT, Oids).

async_get_bulk(UserId, TargetName, NonRep, MaxRep, Context, Oids) 
  when is_integer(NonRep) andalso 
       is_integer(MaxRep) andalso 
       is_list(Context) andalso 
       is_list(Oids) ->
    snmpm_server:async_get_bulk(UserId, TargetName, 
				NonRep, MaxRep, Context, Oids);

async_get_bulk(UserId, TargetName, NonRep, MaxRep, Oids, Expire) 
  when is_integer(NonRep) andalso 
       is_integer(MaxRep) andalso 
       is_list(Oids) andalso 
       is_integer(Expire) ->
    async_get_bulk(UserId, TargetName, 
		   NonRep, MaxRep, ?DEFAULT_CONTEXT, Oids, Expire).

async_get_bulk(UserId, TargetName, NonRep, MaxRep, Context, Oids, Expire) ->
    snmpm_server:async_get_bulk(UserId, TargetName, 
				NonRep, MaxRep, Context, Oids, Expire).

async_get_bulk(UserId, TargetName, NonRep, MaxRep, Context, Oids, Expire, 
	       ExtraInfo) ->
    snmpm_server:async_get_bulk(UserId, TargetName, 
				NonRep, MaxRep, 
				Context, Oids, Expire, ExtraInfo).


agb(UserId, Addr, NonRep, MaxRep, Oids) ->
    agb(UserId, Addr, ?DEFAULT_AGENT_PORT, NonRep, MaxRep, Oids).

agb(UserId, Addr, Port, NonRep, MaxRep, Oids) 
  when is_integer(Port) andalso 
       is_integer(NonRep) andalso 
       is_integer(MaxRep) andalso 
       is_list(Oids) ->
    agb(UserId, Addr, Port, NonRep, MaxRep, ?DEFAULT_CONTEXT, Oids);

agb(UserId, Addr, NonRep, MaxRep, CtxName, Oids) 
  when is_integer(NonRep) andalso 
       is_integer(MaxRep) andalso 
       is_list(CtxName) andalso 
       is_list(Oids) ->
    agb(UserId, Addr, ?DEFAULT_AGENT_PORT, NonRep, MaxRep, CtxName, Oids);

agb(UserId, Addr, NonRep, MaxRep, Oids, Expire) 
  when is_integer(NonRep) andalso 
       is_integer(MaxRep) andalso 
       is_list(Oids) andalso 
       is_integer(Expire) ->
    agb(UserId, Addr, ?DEFAULT_AGENT_PORT, NonRep, MaxRep, Oids, Expire).

agb(UserId, Addr, Port, NonRep, MaxRep, CtxName, Oids) 
  when is_integer(Port) andalso 
       is_integer(NonRep) andalso 
       is_integer(MaxRep), 
       is_list(CtxName) andalso 
       is_list(Oids) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    async_get_bulk(UserId, TargetName, 
			   NonRep, MaxRep, CtxName, Oids);
	Error ->
	    Error
    end;

agb(UserId, Addr, Port, NonRep, MaxRep, Oids, Expire) 
  when is_integer(Port) andalso 
       is_integer(NonRep) andalso 
       is_integer(MaxRep) andalso 
       is_list(Oids) andalso 
       is_integer(Expire) ->
    agb(UserId, Addr, Port, NonRep, MaxRep, ?DEFAULT_CONTEXT, Oids, Expire);

agb(UserId, Addr, NonRep, MaxRep, CtxName, Oids, Expire) 
  when is_integer(NonRep) andalso 
       is_integer(MaxRep) andalso 
       is_list(CtxName) andalso 
       is_list(Oids) andalso 
       is_integer(Expire) ->
    agb(UserId, Addr, ?DEFAULT_AGENT_PORT, NonRep, MaxRep, CtxName, Oids).

agb(UserId, Addr, Port, NonRep, MaxRep, CtxName, Oids, Expire) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    async_get_bulk(UserId, TargetName, 
			   NonRep, MaxRep, CtxName, Oids, Expire);
	Error ->
	    Error
    end.

agb(UserId, Addr, Port, NonRep, MaxRep, CtxName, Oids, Expire, ExtraInfo) ->
    case target_name(Addr, Port) of
	{ok, TargetName} ->
	    async_get_bulk(UserId, TargetName, 
			   NonRep, MaxRep, CtxName, Oids, Expire,
			   ExtraInfo);
	Error ->
	    Error
    end.


cancel_async_request(UserId, ReqId) ->
    snmpm_server:cancel_async_request(UserId, ReqId).


%%%-----------------------------------------------------------------
%%% Audit Trail Log functions (for backward compatibillity)
%%%-----------------------------------------------------------------
log_to_txt(LogDir, Mibs) ->
    OutFile = "snmpm_log.txt",       
    LogName = ?audit_trail_log_name, 
    LogFile = ?audit_trail_log_file, 
    snmp:log_to_txt(LogDir, Mibs, OutFile, LogName, LogFile).
log_to_txt(LogDir, Mibs, OutFile) ->
    LogName = ?audit_trail_log_name, 
    LogFile = ?audit_trail_log_file, 
    snmp:log_to_txt(LogDir, Mibs, OutFile, LogName, LogFile).
log_to_txt(LogDir, Mibs, OutFile, LogName) ->
    LogFile = ?audit_trail_log_file, 
    snmp:log_to_txt(LogDir, Mibs, OutFile, LogName, LogFile).
log_to_txt(LogDir, Mibs, OutFile, LogName, LogFile) -> 
    snmp:log_to_txt(LogDir, Mibs, OutFile, LogName, LogFile).
log_to_txt(LogDir, Mibs, OutFile, LogName, LogFile, Start) -> 
    snmp:log_to_txt(LogDir, Mibs, OutFile, LogName, LogFile, Start).
log_to_txt(LogDir, Mibs, OutFile, LogName, LogFile, Start, Stop) -> 
    snmp:log_to_txt(LogDir, Mibs, OutFile, LogName, LogFile, Start, Stop).


change_log_size(NewSize) ->
    LogName = ?audit_trail_log_name, 
    snmp:change_log_size(LogName, NewSize).


get_log_type() ->
    snmpm_server:get_log_type().

%% NewType -> atl_type()
set_log_type(NewType) ->
    snmpm_server:set_log_type(NewType).


reconfigure() ->
    snmpm_server:reconfigure().


%%%-----------------------------------------------------------------

system_start_time() ->
    {ok, Time} = snmpm_config:system_start_time(),
    Time.

sys_up_time() ->
    % time in 0.01 seconds.
    StartTime = system_start_time(),
    (snmp_misc:now(cs) - StartTime) rem (2 bsl 31).


%%%-----------------------------------------------------------------
%%% This is just some simple utility functions to create a pretty-
%%% printable string of the error reason received from either:
%%% 
%%%    * If any of the sync/async get/get-next/set/get-bulk
%%%      returnes {error, Reason} 
%%%    * The Reason parameter in the handle_error user callback 
%%%      function
%%% 
%%%-----------------------------------------------------------------

format_reason(Reason) ->
    format_reason("", Reason).

format_reason(Prefix, Reason) when is_integer(Prefix) and (Prefix >= 0) ->
    format_reason(lists:duplicate(Prefix, $ ), Reason);
format_reason(Prefix, Reason) when is_list(Prefix) ->
    case (catch do_format_reason(Prefix, Reason)) of
	FL when is_list(FL) ->
	    FL;
	_ ->
	    %% Crap, try it without any fancy formatting
	    case (catch io_lib:format("~sInternal manager error: ~n"
				      "~s   ~p~n", 
				      [Prefix, Prefix, Reason])) of
		L1 when is_list(L1) ->
		    lists:flatten(L1);
		_ ->
		    %% Really crap, try it without the prefix
		    case (catch io_lib:format("Internal manager error: ~n"
					      "   ~p~n", 
					      [Reason])) of
			L2 when is_list(L2) ->
			    lists:flatten(L2);
			_ ->
			    %% Ok, I give up
			    "Illegal input. Unable to format error reason"
		    end
	    end
    end.
		    

do_format_reason(Prefix, {failed_generating_response, {RePdu, Reason}}) ->
    FmtPdu = format_pdu(Prefix ++ "   ", RePdu),
    lists:flatten(io_lib:format("~sFailed generating response: ~n"
				"~s"
				"~s   ~p~n", 
				[Prefix, FmtPdu, Prefix, Reason]));
do_format_reason(Prefix, {failed_processing_message, Reason})  ->
    lists:flatten(io_lib:format("~sFailed processing message: ~n"
				"~s   ~p~n", 
				[Prefix, Prefix, Reason]));
do_format_reason(Prefix, {unexpected_pdu, SnmpInfo})  ->
    FmtSnmpInfo = format_snmp_info(Prefix ++ "   ", SnmpInfo),
    lists:flatten(io_lib:format("~sUnexpected PDU: ~n~s", 
				[Prefix, FmtSnmpInfo]));
do_format_reason(Prefix, {send_failed, ReqId, Reason})  ->
    lists:flatten(io_lib:format("~sSend failed: ~n"
				"~s   Request id: ~w~n"
				"~s   Reason:     ~p~n", 
				[Prefix, Prefix, ReqId, Prefix, Reason]));
do_format_reason(Prefix, {invalid_sec_info, SecInfo, SnmpInfo})  ->
    FmtSecInfo  = format_sec_info(Prefix ++ "   ", SecInfo),
    FmtSnmpInfo = format_snmp_info(Prefix ++ "   ", SnmpInfo),
    lists:flatten(io_lib:format("~sInvalid security info: ~n"
				"~s"
				"~s", 
				[Prefix, FmtSecInfo, FmtSnmpInfo]));
do_format_reason(Prefix, Reason)  ->
    lists:flatten(io_lib:format("~sInternal manager error: ~n"
				"~s   ~p~n", [Prefix, Prefix, Reason])).

format_pdu(Prefix, #pdu{type         = Type,
			request_id   = ReqId,
			error_status = ES,
			error_index  = EI,
			varbinds     = VBs}) ->
    FmtPdyType   = format_pdu_type(Type),
    FmtErrStatus = format_error_status(ES),
    FmtErrIdx    = format_error_index(EI),
    FmtVBs       = format_varbinds(Prefix ++ "   ", VBs),
    lists:flatten(io_lib:format("~s~s: ~n"
				"~s   Request-id:   ~w~n"
				"~s   Error-status: ~s~n"
				"~s   Error-index:  ~s~n"
				"~s",
				[Prefix, FmtPdyType,
				 Prefix, ReqId, 
				 Prefix, FmtErrStatus, 
				 Prefix, FmtErrIdx, 
				 FmtVBs]));
format_pdu(Prefix, #trappdu{enterprise    = E,
			    agent_addr    = AA,
			    generic_trap  = GT,
			    specific_trap = ST,
			    time_stamp    = TS,
			    varbinds      = VBs}) ->
    FmtVBs = format_varbinds(Prefix ++ "   ", VBs),
    lists:flatten(io_lib:format("~sTrap PDU: ~n"
				"~s   Enterprise:    ~p~n"
				"~s   Agent address: ~p~n"
				"~s   Generic trap:  ~p~n"
				"~s   Specific trap: ~p~n"
				"~s   Time stamp:    ~p~n"
				"~s",
				[Prefix, 
				 Prefix, E,
				 Prefix, AA, 
				 Prefix, GT, 
				 Prefix, ST, 
				 Prefix, TS, 
				 FmtVBs]));
format_pdu(Prefix, PDU) ->
    lists:flatten(io_lib:format("~s~p~n", [Prefix, PDU])).

format_pdu_type('get-request') ->
    "GetRequest-PDU";
format_pdu_type('get-next-request') ->
    "GetNextRequest-PDU";
format_pdu_type('get-response') ->
    "Response-PDU";
format_pdu_type('set-request') ->
    "SetRequest-PDU";
format_pdu_type('get-bulk-request') ->
    "GetBulkRequest-PDU";
format_pdu_type('inform-request') ->
    "InformRequest-PDU";
format_pdu_type('snmpv2-trap') ->
    "SNMPv2-Trap-PDU";
format_pdu_type(report) ->
    "Report-PDU";
format_pdu_type(T) ->
    lists:flatten(io_lib:format("~p", [T])).
    
format_snmp_info(Prefix, {ES, EI, VBs}) ->
    lists:flatten(io_lib:format("~sSNMP info: ~n"
				"~s   Error-status: ~s~n"
				"~s   Error-index:  ~s~n"
				"~s",
				[Prefix, 
				 Prefix, format_error_status(ES),
				 Prefix, format_error_index(EI),
				 format_varbinds(Prefix ++ "   ", VBs)]));
format_snmp_info(Prefix, JunkSnmpInfo) ->
    lists:flatten(io_lib:format("~sJunk SNMP info: ~n"
				"~s   ~p~n",
				[Prefix, Prefix, JunkSnmpInfo])).

format_error_status(ES) ->
    lists:flatten(io_lib:format("~p", [ES])).

format_error_index(EI) ->
    lists:flatten(io_lib:format("~p", [EI])).

format_sec_info(Prefix, Info) ->
    FmtSecInfo = do_format_sec_info(Prefix ++ "   ", Info),
    lists:flatten(io_lib:format("~sSecurity info: ~n~s", 
				[Prefix, FmtSecInfo])).

do_format_sec_info(_Prefix, []) ->
    "";
do_format_sec_info(Prefix, [{Tag, ExpVal, Val}|T]) ->
    format_sec_info(Prefix, Tag, ExpVal, Val) ++
	do_format_sec_info(Prefix, T).


format_sec_info(_Prefix, _Tag, Val, Val) ->
    "";
format_sec_info(Prefix, Tag, ExpVal, Val) ->
    lists:flatten(io_lib:format("~s~s:~n"
				"~s   Expected value: ~p~n"
				"~s   Actual value:   ~p~n",
				[Prefix, format_sec_info_tag(Tag),
				 Prefix, ExpVal,
				 Prefix, Val])).

format_sec_info_tag(sec_engine_id) ->
    "Sec engine id";
format_sec_info_tag(msg_sec_model) ->
    "Msg sec model";
format_sec_info_tag(sec_name) ->
    "Sec name";
format_sec_info_tag(sec_level) ->
    "Sec level";
format_sec_info_tag(ctx_engine_id) ->
    "Context engine id";
format_sec_info_tag(ctx_name) ->
    "Context name";
format_sec_info_tag(request_id) ->
    "Request id";
format_sec_info_tag(T) ->
    lists:flatten(io_lib:format("~p", [T])).

format_varbinds(Prefix, []) ->
    lists:flatten(io_lib:format("~sVarbinds:    []~n", [Prefix])); 
format_varbinds(Prefix, VBs) when is_list(VBs) ->
    lists:flatten(io_lib:format("~sVarbinds: ~n~s", 
				[Prefix, format_vbs(Prefix ++ "   ", VBs)]));
format_varbinds(Prefix, VBs) ->
    lists:flatten(io_lib:format("~sInvalid varbinds: ~n"
				"~s   ~p~n", 
				[Prefix, Prefix, VBs])).

format_vbs(_Prefix, []) ->
    "";
format_vbs(Prefix, [VB|VBs]) ->
    format_vb(Prefix, VB) ++ format_vbs(Prefix, VBs).
    
format_vb(Prefix, #varbind{oid          = Oid0,
			   variabletype = Type,
			   value        = Val,
			   org_index    = Idx}) ->
    Oid = 
	case snmpm:oid_to_name(Oid0) of
	    {ok, O} ->
		O;
	    _ ->
		Oid0
	end,
    FmtVT  = format_vb_variabletype(Prefix ++ "   ", Type),
    FmtVal = format_vb_value(Prefix ++ "   ", Type, Val),
    lists:flatten(io_lib:format("~s~w:~n"
				"~s"
				"~s"
				"~s   Org-index:     ~p~n", 
				[Prefix, Oid, 
				 FmtVT, 
				 FmtVal, 
				 Prefix, Idx]));
format_vb(Prefix, JunkVB) ->
    lists:flatten(io_lib:format("~sJunk varbind:~n"
				"~s   ~p~n", [Prefix, Prefix, JunkVB])).

format_vb_variabletype(Prefix, Type) when is_atom(Type) ->
    lists:flatten(io_lib:format("~sVariable-type: ~s~n", 
				[Prefix, atom_to_list(Type)]));
format_vb_variabletype(Prefix, Type) ->
    lists:flatten(io_lib:format("~sVariable-type: ~p~n", [Prefix, Type])).

format_vb_value(Prefix, _Type, Val) ->
    lists:flatten(io_lib:format("~sValue:         ~p~n", [Prefix, Val])).


%% ---------------------------------------------------------------------------
%% 
%% --- Internal utility functions ---
%% 

target_name(Addr, Port) ->
    snmpm_config:agent_info(Addr, Port, target_name).

mk_target_name(Addr, Port, Config) ->
    snmpm_config:mk_target_name(Addr, Port, Config).

ensure_engine_id(Config) ->
    case lists:keymember(engine_id, 1, Config) of
	true ->
	    Config;
	false ->
	    DefaultEngineId = "agentEngine-default", 
	    [{engine_id, DefaultEngineId} | Config]
    end.



%% p(F) ->
%%     p(F, []).

%% p(F, A) ->
%%     io:format("~w:" ++ F ++ "~n", [?MODULE | A]).