aboutsummaryrefslogblamecommitdiffstats
path: root/lib/snmp/src/manager/snmpm_server.erl
blob: 374ecbd561547477e3b2eb97ca5d8e4a1a0482f3 (plain) (tree)
1
2
3
4
5
6
7
8
9
10
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926

                   
  
                                                        
  




                                                                      
  



                                                                         
  

















                                                                        







                            














                                                                             













                                                               



















                                                                        
                                                          




                                                               




                                                                
 

                                             
                                    
                                                               
                                         
                                                                    
                                         



                                                                    







                                                                     
 
                                                                            






































                                                                        

                





































































                                                                              


                                                              

                                               


                                                             
 
                    

                                                
                                        

                                                       
                                                                              





                                                                



                                                                        
 
 

                    

                                                


                                                                  

                    

                                                 
                                                               

                                                       
                                                                              





                                                                

                                                                          

                     
 
 

                        

                                                    

                                                                      
 

                    
                                                   

                                                                  

                                                            

                                                              





                                                                     

                                                                            
                    
 

 

                         

                                                     
                                                      
                                                                       

 

                                                      
                                                                         

                                                            

                                                              





                                                                     

                                                                          

 


                        

                                                                    
                                                                     







                                                               


                                                     


                                                                   
                                                                  



                                                                            
                                                








                                                                          

                                                                            
 


                         

                                                                     




                                                                      


                                                                    
                                                                         



                                                                            
                                                








                                                                          

                                                                          

 



                                                                            

                                                      



                                                                        

                                                       
                                                             


                                                              
                                           





                                                                       

                                                                            

 


                    

                                                       



                                                                         

                                                        
                                                               


                                                              
                                           





                                                                       

                                                                          







































































































































































































































                                                                                 

                                                                 

                                                   









                                                                    
                                                                  

                                                                          
                           

                                                          







                                                                    
                     

 


                                                                      
                                                     











                                                                         




                                                                          







                                                                         
                     


                                         

                                                                       
                           

                                                        











                                                                               

                                                                 

                                                          








                                                                         
                     

 
















                                                                           


                                                        

                                                                 







                                                                          
                     

 











                                                                        


                                                 

                                                          


                                                                            










                                                                             

 

                                                                  


                                                      

                                                              


                                                                           
                     


                                         













                                                                         


                                                                

                                                            




                                                                      
                     

 












                                                                               


                                                       

                                                                 


                                                                            
                     













































































































































































































































                                                                                 



                            
                             



                                                                          



                                           
                                 
                                 
                                   

                                                             
                                                          
                                                                   

                                                           

                                                           
                                                             
                                                  
                                                   

                                                              
                                                               



                                                      
                                                  






                                                   








                                                               

                                                                      









                                                                               



                                                
                                 
                                 
                                   
                                                             
                                            
                                                          
                                                                        

                                                                

                                                                
                                                                  



                                                              
                                                                    



                                                      
                                                  






                                                    













                                                               










                                                                              



                                                


                                 
                                 
                                   
                                                                             
                                            
                                                          
                                                                        
                                            

                                                                
                                                                          
                                                                  



                                                              
                                                                    



                                                      
                                                  






                                                    












                                                                        









                                                                               



                                           
                                  
                                  
                                    
                                                          
                                            
                                                          
                                                                   

                                                                  

                                                           
                                                             



                                                              
                                                               



                                                      
                                                  






                                                   












                                                                            








                                                                     



                                            
                                 

                                                       
                                            
                                                          
                                                                    
                                           

                                                          
                                                    
                                                              
                                                   



                                                     
                                                 



















                                                                      








                                                                          



                                                 
                                 

                                                       
                                            
                                                          
                                                                         
                                           
                                                               

                                                               
                                                                   
                                                        



                                                     
                                                 




















                                                               












                                                                              



                                                 


                                 

                                                                       
                                            
                                                          
                                                                         
                                           

                                                               
                                                                         
                                                                   
                                                        



                                                     
                                                 


















                                                                        








                                                                            



                                            
                                  

                                                              
                                            
                                                          
                                                                    
                                           
                                                                 

                                                          
                                                              
                                                   



                                                     
                                                 










































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































                                                                                  
                                                                    









                                                   
                              
                              





                                                                 

                       
                                                                         



                                                   
                                                                          

                       
                                                              




                                                          
                                                                          

                       
                                                                           



                                              
                                                                          

































































































































































































                                                                               
                                   

                                                    
                                                      





                                                                       
                        
                                                                       


                                                                        
                        
                                                                   
                                                                

                                                                   
                                                                

                                                                   
                                                                






                                                                         
                        
                                                                 
                                                                

                                                                 
                                                                



                                                                   
                                                      


                                                      
                                                                         




                              





                                                   




















































































































































                                                                        





                                                                        



















































































































                                                                        
%% 
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2004-2011. 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_server).

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

%% User interface
-export([start_link/0, stop/0, 
	 is_started/0, 

	 load_mib/1, unload_mib/1, 

	 register_user/4, register_user_monitor/4, unregister_user/1, 

	 sync_get2/4, 
	 async_get2/4, 
	 sync_get_next2/4, 
	 async_get_next2/4, 
	 sync_get_bulk2/6, 
	 async_get_bulk2/6, 
	 sync_set2/4, 
	 async_set2/4, 
	 cancel_async_request/2,

	 %% discovery/2, discovery/3, discovery/4, discovery/5, discovery/6, 

	 %% system_info_updated/2, 
	 get_log_type/0,      set_log_type/1, 

	 reconfigure/0,

	 info/0, 
	 verbosity/1, verbosity/2 

	]).


%% <BACKWARD-COMPAT>
-export([sync_get/4,       sync_get/5,       sync_get/6, 
	 async_get/4,      async_get/5,      async_get/6, 
	 sync_get_next/4,  sync_get_next/5,  sync_get_next/6, 
	 async_get_next/4, async_get_next/5, async_get_next/6, 
	 sync_get_bulk/6,  sync_get_bulk/7,  sync_get_bulk/8, 
	 async_get_bulk/6, async_get_bulk/7, async_get_bulk/8, 
	 sync_set/4,       sync_set/5,       sync_set/6, 
	 async_set/4,      async_set/5,      async_set/6
	]).
%% </BACKWARD-COMPAT>



%% Internal exports
-export([init/1, handle_call/3, handle_cast/2, handle_info/2, 
	 code_change/3, terminate/2]).

%% GCT exports
-export([gct_init/1, gct/2]).


-include("snmpm_internal.hrl").
-include("snmp_debug.hrl").
-include("snmp_types.hrl").
-include("STANDARD-MIB.hrl").
-include("SNMP-FRAMEWORK-MIB.hrl").
-include("snmp_verbosity.hrl").


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

-define(SERVER, ?MODULE).

-define(DEFAULT_SYNC_TIMEOUT,           timer:seconds(5)).
-define(DEFAULT_SYNC_GET_TIMEOUT,       ?DEFAULT_SYNC_TIMEOUT).
-define(DEFAULT_SYNC_GET_NEXT_TIMEOUT,  ?DEFAULT_SYNC_TIMEOUT).
-define(DEFAULT_SYNC_GET_BULK_TIMEOUT,  ?DEFAULT_SYNC_TIMEOUT).
-define(DEFAULT_SYNC_SET_TIMEOUT,       ?DEFAULT_SYNC_TIMEOUT).

-define(DEFAULT_ASYNC_TIMEOUT,          timer:seconds(5)).
-define(DEFAULT_ASYNC_GET_TIMEOUT,      ?DEFAULT_ASYNC_TIMEOUT).
-define(DEFAULT_ASYNC_GET_NEXT_TIMEOUT, ?DEFAULT_ASYNC_TIMEOUT).
-define(DEFAULT_ASYNC_GET_BULK_TIMEOUT, ?DEFAULT_ASYNC_TIMEOUT).
-define(DEFAULT_ASYNC_SET_TIMEOUT,      ?DEFAULT_ASYNC_TIMEOUT).

-define(SNMP_AGENT_PORT,                161).

-define(SYNC_GET_TIMEOUT(SendOpts), 
	get_opt(timeout, ?DEFAULT_SYNC_GET_TIMEOUT, SendOpts)).
-define(SYNC_GET_NEXT_TIMEOUT(SendOpts), 
	get_opt(timeout, ?DEFAULT_SYNC_GET_NEXT_TIMEOUT, SendOpts)).
-define(SYNC_GET_BULK_TIMEOUT(SendOpts), 
	get_opt(timeout, ?DEFAULT_SYNC_GET_BULK_TIMEOUT, SendOpts)).
-define(SYNC_SET_TIMEOUT(SendOpts), 
	get_opt(timeout, ?DEFAULT_SYNC_SET_TIMEOUT, SendOpts)).

-define(ASYNC_GET_TIMEOUT(SendOpts), 
	get_opt(timeout, ?DEFAULT_ASYNC_GET_TIMEOUT, SendOpts)).
-define(ASYNC_GET_NEXT_TIMEOUT(SendOpts), 
	get_opt(timeout, ?DEFAULT_ASYNC_GET_NEXT_TIMEOUT, SendOpts)).
-define(ASYNC_GET_BULK_TIMEOUT(SendOpts), 
	get_opt(timeout, ?DEFAULT_ASYNC_GET_BULK_TIMEOUT, SendOpts)).
-define(ASYNC_SET_TIMEOUT(SendOpts), 
	get_opt(timeout, ?DEFAULT_ASYNC_SET_TIMEOUT, SendOpts)).

-define(GET_EXTRA(SendOpts), get_opt(extra, ?DEFAULT_EXTRA_INFO, SendOpts)).

-ifdef(snmp_debug).
-define(GS_START_LINK(Args),
	gen_server:start_link({local, ?SERVER}, ?MODULE, Args, 
			      [{debug,[trace]}])).
-else.
-define(GS_START_LINK(Args),
	gen_server:start_link({local, ?SERVER}, ?MODULE, Args, [])).
-endif.



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

-record(state,
	{parent,
	 gct,
	 note_store,
	 note_store_ref,
	 net_if,
	 net_if_mod,
	 net_if_ref,
	 req,  %%  ???? Last request id in outgoing message
	 oid,  %%  ???? Last oid in request outgoing message
	 mini_mib
	}
       ).

%% The active state is to ensure that nothing unpleasant happens
%% during (after) a code_change. At the initial start of the
%% application, this process (GCT) will make one run and then
%% deactivate (unless some async request has been issued in the
%% meantime).
-record(gct, {parent, state = active, timeout}).

-record(request, 
	{id, 
	 user_id,
	 reg_type,
	 target,
	 domain,
	 addr, 
	 port, 
	 type, 
	 data, 
	 ref, 
	 mon, 
	 from,
	 discovery = false, 
	 expire = infinity % When shall the request expire (time in ms)
	}
       ). 

-record(monitor,
	{id, 
	 mon,
	 proc
	}
       ).


%%%-------------------------------------------------------------------
%%% API
%%%-------------------------------------------------------------------

start_link() ->
    ?d("start_link -> entry", []),
    Args = [],
    ?GS_START_LINK(Args).

stop() ->
    call(stop).

is_started() ->
    case (catch call(is_started, 1000)) of
	Bool when ((Bool =:= true) orelse (Bool =:= false)) ->
	    Bool;
	_ ->
	    false
    end.

load_mib(MibFile) when is_list(MibFile) ->
    call({load_mib, MibFile}).

unload_mib(Mib) when is_list(Mib) ->
    call({unload_mib, Mib}).


register_user(UserId, UserMod, UserData, DefaultAgentConfig) ->
    snmpm_config:register_user(UserId, UserMod, UserData, DefaultAgentConfig).

register_user_monitor(Id, Module, Data, DefaultAgentConfig) ->
    case register_user(Id, Module, Data, DefaultAgentConfig) of
	ok ->
	    case call({monitor_user, Id, self()}) of
		ok ->
		    ok;
		Error ->
		    unregister_user(Id),
		    Error
	    end;
	Error ->
	    Error
    end.

unregister_user(UserId) ->
    call({unregister_user, UserId}).


%% -- [sync] get --

%% The reason why we have a sync_get2 is to simplify backward 
%% compatibillity. 

%% sync_get2(UserId, TargetName, Oids) ->
%%     sync_get2(UserId, TargetName, Oids, []).
sync_get2(UserId, TargetName, Oids, Opts) ->
    call({sync_get, self(), UserId, TargetName, Oids, Opts}).


%% <BACKWARD-COMPAT>
sync_get(UserId, TargetName, CtxName, Oids) ->
    sync_get(UserId, TargetName, CtxName, Oids, 
	     ?DEFAULT_SYNC_GET_TIMEOUT).

sync_get(UserId, TargetName, CtxName, Oids, Timeout) ->
    sync_get(UserId, TargetName, CtxName, Oids, Timeout, ?DEFAULT_EXTRA_INFO).

sync_get(UserId, TargetName, CtxName, Oids, Timeout, ExtraInfo) 
  when is_list(TargetName) andalso 
       is_list(CtxName) andalso 
       is_list(Oids) andalso 
       is_integer(Timeout) ->
    Opts = [{context, CtxName}, {timeout, Timeout}, {extra, ExtraInfo}],
    sync_get2(UserId, TargetName, Oids, Opts).
%% </BACKWARD-COMPAT>



%% -- [async] get --

%% async_get2(UserId, TargetName, Oids) ->
%%     async_get2(UserId, TargetName, Oids, []).
async_get2(UserId, TargetName, Oids, SendOpts) ->
    call({async_get, self(), UserId, TargetName, Oids, SendOpts}).


%% <BACKWARD-COMPAT>
async_get(UserId, TargetName, CtxName, Oids) ->
    async_get(UserId, TargetName, CtxName, Oids, 
	      ?DEFAULT_ASYNC_GET_TIMEOUT, ?DEFAULT_EXTRA_INFO).

async_get(UserId, TargetName, CtxName, Oids, Expire) ->
    async_get(UserId, TargetName, CtxName, Oids, Expire, ?DEFAULT_EXTRA_INFO).

async_get(UserId, TargetName, CtxName, Oids, Expire, ExtraInfo) 
  when (is_list(TargetName) andalso 
	is_list(CtxName) andalso 
	is_list(Oids) andalso 
	is_integer(Expire) andalso (Expire >= 0)) ->
    SendOpts = [{context, CtxName}, {expire, Expire}, {extra, ExtraInfo}],
    async_get2(UserId, TargetName, Oids, SendOpts).
%% </BACKWARD-COMPAT>



%% -- [sync] get-next --

%% sync_get_next2(UserId, TargetName, Oids) ->
%%     sync_get_next2(UserId, TargetName, Oids, []).
sync_get_next2(UserId, TargetName, Oids, SendOpts) ->
    call({sync_get_next, self(), UserId, TargetName, Oids, SendOpts}).


%% <BACKWARD-COMPAT>
sync_get_next(UserId, TargetName, CtxName, Oids) ->
    sync_get_next(UserId, TargetName, CtxName, Oids, 
		  ?DEFAULT_SYNC_GET_TIMEOUT, ?DEFAULT_EXTRA_INFO).

sync_get_next(UserId, TargetName, CtxName, Oids, Timeout) ->
    sync_get_next(UserId, TargetName, CtxName, Oids, Timeout, 
		  ?DEFAULT_EXTRA_INFO).

sync_get_next(UserId, TargetName, CtxName, Oids, Timeout, ExtraInfo) 
  when is_list(TargetName) andalso 
       is_list(CtxName) andalso 
       is_list(Oids) andalso 
       is_integer(Timeout) ->
    SendOpts = [{context, CtxName}, {timeout, Timeout}, {extra, ExtraInfo}],
    sync_get_next2(UserId, TargetName, Oids, SendOpts).
%% <BACKWARD-COMPAT>



%% -- [async] get-next --

%% async_get_next2(UserId, TargetName, Oids) ->
%%     async_get_next2(UserId, TargetName, Oids, []).
async_get_next2(UserId, TargetName, Oids, SendOpts) ->
    call({async_get_next, self(), UserId, TargetName, Oids, SendOpts}).


async_get_next(UserId, TargetName, CtxName, Oids) ->
    async_get_next(UserId, TargetName, CtxName, Oids, 
		   ?DEFAULT_ASYNC_GET_NEXT_TIMEOUT, ?DEFAULT_EXTRA_INFO).

async_get_next(UserId, TargetName, CtxName, Oids, Expire) ->
    async_get_next(UserId, TargetName, CtxName, Oids, Expire, 
		   ?DEFAULT_EXTRA_INFO).

async_get_next(UserId, TargetName, CtxName, Oids, Expire, ExtraInfo) 
  when (is_list(TargetName) andalso 
	is_list(CtxName) andalso 
	is_list(Oids) andalso 
	is_integer(Expire) andalso (Expire >= 0)) ->
    SendOpts = [{context, CtxName}, {expire, Expire}, {extra, ExtraInfo}],
    async_get_next2(UserId, TargetName, Oids, SendOpts).



%% -- [sync] get-bulk --

%% sync_get_bulk2(UserId, TargetName, NonRep, MaxRep, Oids) ->
%%     sync_get_bulk2(UserId, TargetName, NonRep, MaxRep, Oids, []).
sync_get_bulk2(UserId, TargetName, NonRep, MaxRep, Oids, SendOpts) ->
    %% p("sync_get_bulk2 -> entry with"
    %%   "~n   UserId:     ~p"
    %%   "~n   TargetName: ~p"
    %%   "~n   NonRep:     ~p"
    %%   "~n   MaxRep:     ~p"
    %%   "~n   Oids:       ~p"
    %%   "~n   SendOpts:   ~p", 
    %%   [UserId, TargetName, NonRep, MaxRep, Oids, SendOpts]),
    call({sync_get_bulk, self(), UserId, TargetName, 
	  NonRep, MaxRep, Oids, SendOpts}).

sync_get_bulk(UserId, TargetName, NonRep, MaxRep, CtxName, Oids) ->
    sync_get_bulk(UserId, TargetName, 
		  NonRep, MaxRep, CtxName, Oids, 
		  ?DEFAULT_SYNC_GET_TIMEOUT, ?DEFAULT_EXTRA_INFO).

sync_get_bulk(UserId, TargetName, NonRep, MaxRep, CtxName, Oids, Timeout) ->
    sync_get_bulk(UserId, TargetName, 
		  NonRep, MaxRep, CtxName, Oids, 
		  Timeout, ?DEFAULT_EXTRA_INFO).

sync_get_bulk(UserId, TargetName, NonRep, MaxRep, CtxName, Oids, Timeout, 
	      ExtraInfo) 
  when is_list(TargetName) andalso 
       is_integer(NonRep) andalso 
       is_integer(MaxRep) andalso 
       is_list(CtxName) andalso 
       is_list(Oids) andalso 
       is_integer(Timeout) ->
    SendOpts = [{context, CtxName}, {timeout, Timeout}, {extra, ExtraInfo}],
    sync_get_bulk2(UserId, TargetName, NonRep, MaxRep, Oids, SendOpts).


%% -- [async] get-bulk --

%% async_get_bulk2(UserId, TargetName, NonRep, MaxRep, Oids) ->
%%     async_get_bulk2(UserId, TargetName, NonRep, MaxRep, Oids, []).
async_get_bulk2(UserId, TargetName, NonRep, MaxRep, Oids, SendOpts) ->
    call({async_get_bulk, self(), UserId, TargetName, NonRep, MaxRep, 
	  Oids, SendOpts}).


async_get_bulk(UserId, TargetName, NonRep, MaxRep, CtxName, Oids) ->
    async_get_bulk(UserId, TargetName, 
		   NonRep, MaxRep, CtxName, Oids, 
		   ?DEFAULT_ASYNC_GET_BULK_TIMEOUT, ?DEFAULT_EXTRA_INFO).

async_get_bulk(UserId, TargetName, NonRep, MaxRep, CtxName, Oids, Expire) ->
    async_get_bulk(UserId, TargetName, 
		   NonRep, MaxRep, CtxName, Oids, 
		   Expire, ?DEFAULT_EXTRA_INFO).

async_get_bulk(UserId, TargetName, NonRep, MaxRep, CtxName, Oids, Expire, 
	       ExtraInfo) 
  when is_list(TargetName) andalso 
       is_integer(NonRep) andalso 
       is_integer(MaxRep) andalso 
       is_list(CtxName) andalso 
       is_list(Oids) andalso 
       is_integer(Expire) ->
    SendOpts = [{context, CtxName}, {expire, Expire}, {extra, ExtraInfo}],
    async_get_bulk2(UserId, TargetName, NonRep, MaxRep, Oids, SendOpts).



%% -- [sync] set --

%% VarsAndValues is: {PlainOid, o|s|i, Value} (unknown mibs) | {Oid, Value} 
%% sync_set2(UserId, TargetName, VarsAndVals) ->
%%     sync_set2(UserId, TargetName, VarsAndVals, []).
sync_set2(UserId, TargetName, VarsAndVals, SendOpts) ->
    call({sync_set, self(), UserId, TargetName, VarsAndVals, SendOpts}).


sync_set(UserId, TargetName, CtxName, VarsAndVals) ->
    sync_set(UserId, TargetName, CtxName, VarsAndVals, 
	     ?DEFAULT_SYNC_SET_TIMEOUT, ?DEFAULT_EXTRA_INFO).

sync_set(UserId, TargetName, CtxName, VarsAndVals, Timeout) ->
    sync_set(UserId, TargetName, CtxName, VarsAndVals, 
	     Timeout, ?DEFAULT_EXTRA_INFO).

sync_set(UserId, TargetName, CtxName, VarsAndVals, Timeout, ExtraInfo) 
  when is_list(TargetName) andalso 
       is_list(CtxName) andalso 
       is_list(VarsAndVals) andalso 
       is_integer(Timeout) ->
    SendOpts = [{context, CtxName}, {timeout, Timeout}, {extra, ExtraInfo}],
    sync_set2(UserId, TargetName, VarsAndVals, SendOpts).



%% -- [async] set --

%% async_set2(UserId, TargetName, VarsAndVals) ->
%%     async_set2(UserId, TargetName, VarsAndVals, []).
async_set2(UserId, TargetName, VarsAndVals, SendOpts) ->
    call({async_set, self(), UserId, TargetName, VarsAndVals, SendOpts}).


async_set(UserId, TargetName, CtxName, VarsAndVals) ->
    async_set(UserId, TargetName, CtxName, VarsAndVals, 
	      ?DEFAULT_ASYNC_SET_TIMEOUT, ?DEFAULT_EXTRA_INFO).

async_set(UserId, TargetName, CtxName, VarsAndVals, Expire) ->
    async_set(UserId, TargetName, CtxName, VarsAndVals, 
	      Expire, ?DEFAULT_EXTRA_INFO).

async_set(UserId, TargetName, CtxName, VarsAndVals, Expire, ExtraInfo) 
  when (is_list(TargetName) andalso 
	is_list(CtxName) andalso 
	is_list(VarsAndVals) andalso 
	is_integer(Expire) andalso (Expire >= 0)) ->
    SendOpts = [{context, CtxName}, {expire, Expire}, {extra, ExtraInfo}],
    async_set2(UserId, TargetName, VarsAndVals, SendOpts).


cancel_async_request(UserId, ReqId) ->
    call({cancel_async_request, UserId, ReqId}).


%% discovery(UserId, BAddr) ->
%%     discovery(UserId, BAddr, ?SNMP_AGENT_PORT, [], 
%% 	      ?DEFAULT_ASYNC_EXPIRE, ?EXTRA_INFO).

%% discovery(UserId, BAddr, Config) when is_list(Config) ->
%%     discovery(UserId, BAddr, ?SNMP_AGENT_PORT, Config, 
%% 	      ?DEFAULT_ASYNC_EXPIRE, ?EXTRA_INFO);

%% discovery(UserId, BAddr, Expire) when is_integer(Expire) ->
%%     discovery(UserId, BAddr, ?SNMP_AGENT_PORT, [], Expire, ?EXTRA_INFO).

%% discovery(UserId, BAddr, Config, Expire) ->
%%     discovery(UserId, BAddr, ?SNMP_AGENT_PORT, Config, Expire, ?EXTRA_INFO).

%% discovery(UserId, BAddr, Port, Config, Expire) ->
%%     discovery(UserId, BAddr, Port, Config, Expire, ?EXTRA_INFO).

%% discovery(UserId, BAddr, Port, Config, Expire, ExtraInfo) ->
%%     call({discovery, self(), UserId, BAddr, Port, Config, Expire, ExtraInfo}).

    
verbosity(Verbosity) ->
    case ?vvalidate(Verbosity) of
	Verbosity ->
	    call({verbosity, Verbosity});
	_ ->
	    {error, {invalid_verbosity, Verbosity}}
    end.

info() ->
    call(info).

verbosity(net_if = Ref, Verbosity) ->
    verbosity2(Ref, Verbosity);
verbosity(note_store = Ref, Verbosity) ->
    verbosity2(Ref, Verbosity).

verbosity2(Ref, Verbosity) ->
    case ?vvalidate(Verbosity) of
	Verbosity ->
	    call({verbosity, Ref, Verbosity});
	_ ->
	    {error, {invalid_verbosity, Verbosity}}
    end.

%% Target -> all | server | net_if
%% system_info_updated(Target, What) ->
%%     call({system_info_updated, Target, What}).

get_log_type() ->
    call(get_log_type).

set_log_type(NewType) ->
    call({set_log_type, NewType}).

reconfigure() ->
    call(reconfigure).


%%----------------------------------------------------------------------
%% Options: List of
%%  {community, String ("public" is default} 
%%  {mibs, List of Filenames}
%%  {trap_udp, integer() (default 5000)}
%%  {conf_dir, string()}
%%  {log_dir,  string()}
%%  {db_dir,   string()}
%%  {db_repair, true | false}
%%----------------------------------------------------------------------
init(_) ->
    ?d("init -> entry", []),
    case (catch do_init()) of
	{ok, State} ->
	    {ok, State};
	{error, Reason} ->
	    {stop, Reason}
    end.


%% Put all config stuff in a snmpm_config module/process.
%% Tables should be protected so that it is cheap to 
%% read. Writing has to go through the interface...

do_init() ->
    process_flag(trap_exit, true),
    {ok, Prio} = snmpm_config:system_info(prio),
    process_flag(priority, Prio),

    {ok, Verbosity} = snmpm_config:system_info(server_verbosity),
    put(sname, mse),
    put(verbosity, Verbosity),
    ?vlog("starting", []),

    %% Start the garbage collector timer process
    {ok, Timeout} = snmpm_config:system_info(server_timeout),
    {ok, GCT} = gct_start(Timeout),

    %% -- Create request table --
    ets:new(snmpm_request_table, 
	    [set, protected, named_table, {keypos, #request.id}]),

    %% -- Create monitor table --
    ets:new(snmpm_monitor_table, 
	    [set, protected, named_table, {keypos, #monitor.id}]),

    %% -- Start the note-store and net-if processes --
    {NoteStore, NoteStoreRef} = do_init_note_store(Prio),
    {NetIf, NetIfModule, NetIfRef} = do_init_net_if(NoteStore),

    MiniMIB = snmpm_config:make_mini_mib(),
    State = #state{mini_mib       = MiniMIB,
		   gct            = GCT,
		   note_store     = NoteStore,
		   note_store_ref = NoteStoreRef,
		   net_if         = NetIf,
		   net_if_mod     = NetIfModule,
		   net_if_ref     = NetIfRef},
    ?vlog("started", []),
    {ok, State}.


do_init_note_store(Prio) ->
    ?vdebug("try start note store", []),
    {ok, Verbosity} = snmpm_config:system_info(note_store_verbosity),
    {ok, Timeout}   = snmpm_config:system_info(note_store_timeout),
    Opts = [{sname,     mns}, 
	    {verbosity, Verbosity}, 
	    {timeout,   Timeout}],
    case snmpm_misc_sup:start_note_store(Prio, Opts) of
	{ok, Pid} ->
	    ?vtrace("do_init_note_store -> Pid: ~p", [Pid]),
	    Ref = erlang:monitor(process, Pid),
	    {Pid, Ref};
	{error, Reason} ->
	    ?vlog("failed starting note-store - Reason: "
		  "~n   Reason: ~p"
		  "~n", [Reason]),
	    throw({error, {failed_starting_note_store, Reason}})
    end.

do_init_net_if(NoteStore) ->
    ?vdebug("try start net if", []),
    {ok, NetIfModule} = snmpm_config:system_info(net_if_module),
    case snmpm_misc_sup:start_net_if(NetIfModule, NoteStore) of
	{ok, Pid} ->
	    ?vtrace("do_init_net_if -> Pid: ~p", [Pid]),
	    Ref = erlang:monitor(process, Pid),
	    {Pid, NetIfModule, Ref};
	{error, Reason} ->
	    ?vlog("failed starting net-if - Reason: "
		  "~n   Reason: ~p"
		  "~n", [Reason]),
	    throw({error, {failed_starting_net_if, Reason}})
    end.

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

handle_call({monitor_user, Id, Pid}, _From, State) when is_pid(Pid) ->
    ?vlog("received monitor_user request for ~w [~w]", [Id, Pid]),
    Reply = 
	case ets:lookup(snmpm_monitor_table, Id) of
	    [#monitor{proc = Pid}] ->
		?vdebug("already monitored", []),
		ok;

	    [#monitor{proc = OtherPid}] ->
		?vinfo("already registered to ~w", [OtherPid]),
		{error, {already_monitored, OtherPid}};

	    [] ->
		Ref = erlang:monitor(process, Pid),
		?vtrace("monitor ref: ~w", [Ref]),
		Mon = #monitor{id = Id, mon = Ref, proc = Pid},
		ets:insert(snmpm_monitor_table, Mon),
		ok
	end,
    {reply, Reply, State};

handle_call({unregister_user, UserId}, _From, State) ->
    ?vlog("received request to unregister user ~p", [UserId]),

    %% 1) If this user is monitored, then demonitor
    ?vtrace("handle_call(unregister_user) -> maybe demonitor", []),
    case ets:lookup(snmpm_monitor_table, UserId) of
	[] ->
	    ok;
	[#monitor{mon = M}] ->
	    maybe_demonitor(M), % This is really overkill (meybe_), but...
	    ok
    end,

    %% 2) Delete all outstanding requests from this user
    ?vtrace("handle_call(unregister_user) -> "
	    "delete all outstanding requests for user", []),
    Pat = #request{user_id = UserId, 
		   id = '$1', ref = '$2', mon = '$3', _ = '_'},
    Match = ets:match(snmpm_request_table, Pat),
    ?vtrace("handle_call(unregister_user) -> Match: ~p", [Match]),
    F1 = fun([ReqId, Ref, MonRef]) -> 
		 ets:delete(snmpm_request_table, ReqId),
		 cancel_timer(Ref),
		 maybe_demonitor(MonRef),
		 ok
	end,
    lists:foreach(F1, Match),
    
    %% 3) Unregister all agents registered by this user
    ?vdebug("handle_call(unregister_user) -> "
	    "unregister all agents registered by user", []),
    Agents = snmpm_config:which_agents(UserId),
    ?vtrace("handle_call(unregister_user) -> Agents: ~p", [Agents]),
    F2 = fun(TargetName) ->
		 snmpm_config:unregister_agent(UserId, TargetName)
	 end,
    lists:foreach(F2, Agents),

    %% 4) Unregister the user
    ?vdebug("handle_call(unregister_user) -> unregister user", []),
    Reply = snmpm_config:unregister_user(UserId),
    ?vtrace("handle_call(unregister_user) -> Reply: ~p", [Reply]),
    {reply, Reply, State};


%% We will reply to this request later, when the reply comes in from the
%% agent, or when the timeout hits (unless we get an error now).
handle_call({sync_get, Pid, UserId, TargetName, Oids, SendOpts}, 
	    From, State) ->
    ?vlog("[~p,~p] received sync_get request for: "
	  "~n   ~p", [UserId, TargetName, Oids]),
    case (catch handle_sync_get(Pid, 
				UserId, TargetName, Oids, SendOpts, 
				From, State)) of
	ok ->
	    {noreply, State};
	Error ->
	    {reply, Error, State}
    end;

%% <BACKWARD-COMPAT>
%% The only case where this would be called is during code upgrade
handle_call({sync_get, 
	     Pid, UserId, TargetName, CtxName, Oids, Timeout, ExtraInfo}, 
	    From, State) ->
    ?vlog("[~p,~p,~p] received sync_get request for: "
	  "~n   ~p", [UserId, TargetName, CtxName, Oids]),
    case (catch handle_sync_get(Pid, 
				UserId, TargetName, CtxName, Oids, 
				Timeout, ExtraInfo, From, State)) of
	ok ->
	    {noreply, State};
	Error ->
	    {reply, Error, State}
    end;
%% </BACKWARD-COMPAT>


handle_call({sync_get_next, Pid, UserId, TargetName, Oids, SendOpts}, 
	    From, State) ->
    ?vlog("[~p,~p] received sync_get_next request for: "
	  "~n   ~p", [UserId, TargetName, SendOpts]),
    case (catch handle_sync_get_next(Pid, 
				     UserId, TargetName, Oids, SendOpts, 
				     From, State)) of
	ok ->
	    {noreply, State};
	Error ->
	    {reply, Error, State}
    end;


%% <BACKWARD-COMPAT>
%% The only case where this would be called is during code upgrade
handle_call({sync_get_next, 
	     Pid, UserId, TargetName, CtxName, Oids, Timeout, ExtraInfo}, 
	    From, State) ->
    ?vlog("[~p,~p,~p] received sync_get_next request for"
	  "~n   ~p", [UserId, TargetName, CtxName, Oids]),
    case (catch handle_sync_get_next(Pid, 
				     UserId, TargetName, CtxName, Oids, 
				     Timeout, ExtraInfo, From, State)) of
	ok ->
	    {noreply, State};
	Error ->
	    {reply, Error, State}
    end;
%% </BACKWARD-COMPAT>


%% Check agent version? This op not in v1
handle_call({sync_get_bulk, 
	     Pid, UserId, TargetName, NonRep, MaxRep, Oids, SendOpts}, 
	    From, State) ->
    ?vlog("[~p,~p] received sync_get_bulk request for: "
	  "~n   ~p", [UserId, TargetName, Oids]),
    case (catch handle_sync_get_bulk(Pid, 
				     UserId, TargetName, NonRep, MaxRep, Oids, 
				     SendOpts, From, State)) of
	ok ->
	    {noreply, State};
	Error ->
	    {reply, Error, State}
    end;

%% <BACKWARD-COMPAT>
%% The only case where this would be called is during code upgrade
handle_call({sync_get_bulk, Pid, UserId, TargetName, 
	     NonRep, MaxRep, CtxName, Oids, Timeout, ExtraInfo}, 
	    From, State) ->
    ?vlog("[~p,~p] received sync_get_bulk request for: ~p"
	  "~n   ~p", [UserId, TargetName, CtxName, Oids]),
    case (catch handle_sync_get_bulk(Pid, 
				     UserId, TargetName, CtxName, 
				     NonRep, MaxRep, Oids, 
				     Timeout, ExtraInfo, From, State)) of
	ok ->
	    {noreply, State};
	Error ->
	    {reply, Error, State}
    end;
%% </BACKWARD-COMPAT>


handle_call({sync_set, 
	     Pid, UserId, TargetName, VarsAndVals, SendOpts}, 
	    From, State) ->
    ?vlog("[~p,~p] received sync_set request for: "
	  "~n   ~p", [UserId, TargetName, VarsAndVals]),
    case (catch handle_sync_set(Pid, 
				UserId, TargetName, VarsAndVals, SendOpts, 
				From, State)) of
	ok ->
	    {noreply, State};
	Error ->
	    {reply, Error, State}
    end;


%% <BACKWARD-COMPAT>
%% The only case where this would be called is during code upgrade
handle_call({sync_set, Pid, UserId, TargetName, 
	     CtxName, VarsAndVals, Timeout, ExtraInfo}, 
	    From, State) ->
    ?vlog("[~p,~p,~p] received sync_set request for: "
	  "~n   ~p", [UserId, TargetName, CtxName, VarsAndVals]),
    case (catch handle_sync_set(Pid, 
				UserId, TargetName, CtxName, VarsAndVals, 
				Timeout, ExtraInfo, From, State)) of
	ok ->
	    {noreply, State};
	Error ->
	    {reply, Error, State}
    end;
%% </BACKWARD-COMPAT>


handle_call({async_get, Pid, UserId, TargetName, Oids, SendOpts}, 
	    _From, State) ->
    ?vlog("[~p,~p] received async_get request for: "
	  "~n   ~p", [UserId, TargetName, Oids]),
    Reply = (catch handle_async_get(Pid, 
				    UserId, TargetName, Oids, SendOpts, 
				    State)),
    {reply, Reply, State};


%% <BACKWARD-COMPAT>
%% The only case where this would be called is during code upgrade
handle_call({async_get, Pid, UserId, TargetName, 
	     CtxName, Oids, Expire, ExtraInfo}, 
	    _From, State) ->
    ?vlog("[~p,~p,~p] received async_get request for: "
	  "~n   ~p", [UserId, TargetName, CtxName, Oids]),
    Reply = (catch handle_async_get(Pid, UserId, TargetName, CtxName, Oids, 
				    Expire, ExtraInfo, State)),
    {reply, Reply, State};
%% </BACKWARD-COMPAT>


handle_call({async_get_next, Pid, UserId, TargetName, Oids, SendOpts}, 
	    _From, State) ->
    ?vlog("[~p,~p] received async_get_next request for: "
	  "~n   ~p", [UserId, TargetName, Oids]),
    Reply = (catch handle_async_get_next(Pid, 
					 UserId, TargetName, Oids, SendOpts, 
					 State)),
    {reply, Reply, State};


%% <BACKWARD-COMPAT>
%% The only case where this would be called is during code upgrade
handle_call({async_get_next, Pid, UserId, TargetName, 
	     CtxName, Oids, Expire, ExtraInfo}, 
	    _From, State) ->
    ?vlog("[~p,~p,~p] received async_get_next request for: ", 
	  [UserId, TargetName, CtxName, Oids]),
    Reply = (catch handle_async_get_next(Pid, UserId, TargetName, CtxName, 
					 Oids, Expire, ExtraInfo, State)),
    {reply, Reply, State};
%% </BACKWARD-COMPAT>


%% Check agent version? This op not in v1
handle_call({async_get_bulk, 
	     Pid, UserId, TargetName, NonRep, MaxRep, Oids, SendOpts}, 
	    _From, State) ->
    ?vlog("[~p,~p] received async_get_bulk request for: "
	  "~n   ~p", [UserId, TargetName, Oids]),
    Reply = (catch handle_async_get_bulk(Pid, 
					 UserId, TargetName, 
					 NonRep, MaxRep, Oids, SendOpts, 
					 State)),
    {reply, Reply, State};


%% <BACKWARD-COMPAT>
%% The only case where this would be called is during code upgrade
handle_call({async_get_bulk, Pid, UserId, TargetName, 
	     NonRep, MaxRep, CtxName, Oids, Expire, ExtraInfo}, 
	    _From, State) ->
    ?vlog("[~p,~p,~p] received async_get_bulk request for: "
	  "~n   ~p", [UserId, TargetName, CtxName, Oids]),
    Reply = (catch handle_async_get_bulk(Pid, 
					 UserId, TargetName, CtxName, 
					 NonRep, MaxRep, Oids, 
					 Expire, ExtraInfo, State)),
    {reply, Reply, State};
%% </BACKWARD-COMPAT>


handle_call({async_set, 
	     Pid, UserId, TargetName, VarsAndVals, SendOpts}, 
	    _From, State) ->
    ?vlog("[~p,~p] received async_set request for: "
	  "~n   ~p", [UserId, TargetName, VarsAndVals]),
    Reply = (catch handle_async_set(Pid, 
				    UserId, TargetName, VarsAndVals, SendOpts, 
				    State)),
    {reply, Reply, State};


%% <BACKWARD-COMPAT>
%% The only case where this would be called is during code upgrade
handle_call({async_set, Pid, UserId, TargetName, 
	     CtxName, VarsAndVals, Expire, ExtraInfo}, 
	    _From, State) ->
    ?vlog("[~p,~p,~p] received async_set request for: "
	  "~n   ~p", [UserId, TargetName, CtxName, VarsAndVals]),
    Reply = (catch handle_async_set(Pid, UserId, TargetName, CtxName, 
				    VarsAndVals, Expire, ExtraInfo, State)),
    {reply, Reply, State};
%% </BACKWARD-COMPAT>


handle_call({cancel_async_request, UserId, ReqId}, _From, State) ->
    ?vlog("received cancel_async_request request", []),
    Reply = (catch handle_cancel_async_request(UserId, ReqId, State)),
    {reply, Reply, State};


%% handle_call({discovery, Pid, UserId, BAddr, Port, Config, Expire, ExtraInfo}, 
%% 	    _From, State) ->
%%     ?vlog("received discovery request", []),
%%     Reply = (catch handle_discovery(Pid, UserId, BAddr, Port, Config, 
%% 				    Expire, ExtraInfo, State)),
%%     {reply, Reply, State};


handle_call({load_mib, Mib}, _From, State) ->
    ?vlog("received load_mib request", []),
    case snmpm_config:load_mib(Mib) of
	ok ->
	    MiniMIB = snmpm_config:make_mini_mib(),
	    {reply, ok, State#state{mini_mib = MiniMIB}};
	Error ->
	    {reply, Error, State}
    end;


handle_call({unload_mib, Mib}, _From, State) ->
    ?vlog("received unload_mib request", []),
    case snmpm_config:unload_mib(Mib) of
	ok ->
	    MiniMIB = snmpm_config:make_mini_mib(),
	    {reply, ok, State#state{mini_mib = MiniMIB}};
	Error ->
	    {reply, Error, State}
    end;

handle_call({verbosity, Verbosity}, _From, State) ->
    ?vlog("received verbosity request", []),
    put(verbosity, Verbosity),
    {reply, ok, State};

handle_call({verbosity, net_if, Verbosity}, _From, 
	    #state{net_if = Pid, net_if_mod = Mod} = State) ->
    ?vlog("received net_if verbosity request", []),
    Mod:verbosity(Pid, Verbosity),
    {reply, ok, State};

handle_call({verbosity, note_store, Verbosity}, _From, 
	    #state{note_store = Pid} = State) ->
    ?vlog("received note_store verbosity request", []),
    snmp_note_store:verbosity(Pid, Verbosity),
    {reply, ok, State};

handle_call(reconfigure, _From, State) ->
    ?vlog("received reconfigure request", []),
    Reply = {error, not_implemented},
    {reply, Reply, State};

handle_call(info, _From, State) ->
    ?vlog("received info request", []),
    Reply = get_info(State), 
    {reply, Reply, State};

handle_call(is_started, _From, State) ->
    ?vlog("received is_started request", []),
    IsStarted = is_started(State), 
    {reply, IsStarted, State};

%% handle_call({system_info_updated, Target, What}, _From, State) ->
%%     ?vlog("received system_info_updated request: "
%% 	  "~n   Target: ~p"
%% 	  "~n   What:   ~p", [Target, What]),
%%     Reply = handle_system_info_updated(State, Target, What), 
%%     {reply, Reply, State};

handle_call(get_log_type, _From, State) ->
    ?vlog("received get_log_type request", []),
    Reply = handle_get_log_type(State), 
    {reply, Reply, State};

handle_call({set_log_type, NewType}, _From, State) ->
    ?vlog("received set_log_type request: "
	  "~n   NewType: ~p", [NewType]),
    Reply = handle_set_log_type(State, NewType), 
    {reply, Reply, State};

handle_call(stop, _From, State) ->
    ?vlog("received stop request", []),
    {stop, normal, ok, State};


handle_call(Req, _From, State) ->
    warning_msg("received unknown request: ~n~p", [Req]),
    {reply, {error, unknown_request}, State}.


handle_cast(Msg, State) ->
    warning_msg("received unknown message: ~n~p", [Msg]),
    {noreply, State}.


handle_info({sync_timeout, ReqId, From}, State) ->
    ?vlog("received sync_timeout [~w] message", [ReqId]),
    handle_sync_timeout(ReqId, From, State),
    {noreply, State};


handle_info({snmp_error, Pdu, Reason}, State) ->
    ?vlog("received snmp_error message", []),
    handle_snmp_error(Pdu, Reason, State),
    {noreply, State};

handle_info({snmp_error, Reason, Addr, Port}, State) ->
    ?vlog("received snmp_error message", []),
    handle_snmp_error(Addr, Port, -1, Reason, State),
    {noreply, State};

handle_info({snmp_error, ReqId, Reason, Addr, Port}, State) ->
    ?vlog("received snmp_error message", []),
    handle_snmp_error(Addr, Port, ReqId, Reason, State),
    {noreply, State};

%% handle_info({snmp_error, ReqId, Pdu, Reason, Addr, Port}, State) ->
%%     ?vlog("received snmp_error message", []),
%%     handle_snmp_error(Pdu, ReqId, Reason, Addr, Port, State),
%%     {noreply, State};


handle_info({snmp_pdu, Pdu, Addr, Port}, State) ->
    ?vlog("received snmp_pdu message", []),
    handle_snmp_pdu(Pdu, Addr, Port, State),
    {noreply, State};


handle_info({snmp_trap, Trap, Addr, Port}, State) ->
    ?vlog("received snmp_trap message", []),
    handle_snmp_trap(Trap, Addr, Port, State),
    {noreply, State};


handle_info({snmp_inform, Ref, Pdu, Addr, Port}, State) ->
    ?vlog("received snmp_inform message", []),
    handle_snmp_inform(Ref, Pdu, Addr, Port, State),
    {noreply, State};


handle_info({snmp_report, {ok, Pdu}, Addr, Port}, State) ->
    handle_snmp_report(Pdu, Addr, Port, State),
    {noreply, State};

handle_info({snmp_report, {error, ReqId, Info, Pdu}, Addr, Port}, State) ->
    handle_snmp_report(ReqId, Pdu, Info, Addr, Port, State),
    {noreply, State};


handle_info(gc_timeout, #state{gct = GCT} = State) ->
    ?vlog("received gc_timeout message", []),
    handle_gc(GCT),
    {noreply, State};


handle_info({'DOWN', _MonRef, process, Pid, _Reason}, 
	    #state{note_store = NoteStore, 
		   net_if     = Pid} = State) ->
    ?vlog("received 'DOWN' message regarding net_if", []),
    {NetIf, _, Ref} = do_init_net_if(NoteStore),
    {noreply, State#state{net_if = NetIf, net_if_ref = Ref}};


handle_info({'DOWN', _MonRef, process, Pid, _Reason}, 
	    #state{note_store = Pid, 
		   net_if     = NetIf,
		   net_if_mod = Mod} = State) ->
    ?vlog("received 'DOWN' message regarding note_store", []),
    {ok, Prio} = snmpm_config:system_info(prio),
    {NoteStore, Ref} = do_init_note_store(Prio),
    Mod:note_store(NetIf, NoteStore),
    {noreply, State#state{note_store = NoteStore, note_store_ref = Ref}};


handle_info({'DOWN', MonRef, process, Pid, Reason}, State) ->
    ?vlog("received 'DOWN' message (~w) from ~w "
	  "~n   Reason: ~p", [MonRef, Pid, Reason]),
    handle_down(MonRef),
    {noreply, State};


handle_info({'EXIT', Pid, Reason}, #state{gct = Pid} = State) ->
    ?vlog("received 'EXIT' message from the GCT (~w) process: "
	  "~n   ~p", [Pid, Reason]),
    {ok, Timeout} = snmpm_config:system_info(server_timeout),
    {ok, GCT} = gct_start(Timeout),
    {noreply, State#state{gct = GCT}};


handle_info(Info, State) ->
    warning_msg("received unknown info: ~n~p", [Info]),
    {noreply, State}.


%%----------------------------------------------------------
%% Code change
%%----------------------------------------------------------
                                                                              
% downgrade
code_change({down, _Vsn}, #state{gct = Pid} = State, _Extra) ->
    ?d("code_change(down) -> entry", []),
    gct_code_change(Pid),
    {ok, State};
 
% upgrade
code_change(_Vsn, #state{gct = Pid} = State0, _Extra) ->
    ?d("code_change(up) -> entry", []),
    gct_code_change(Pid),
    MiniMIB = snmpm_config:make_mini_mib(),
    State = State0#state{mini_mib = MiniMIB},
    {ok, State}.

 
%%----------------------------------------------------------
%% Terminate
%%----------------------------------------------------------
                                                                              
terminate(Reason, #state{gct = GCT}) ->
    ?vdebug("terminate: ~p",[Reason]),
    gct_stop(GCT),
    snmpm_misc_sup:stop_note_store(),
    snmpm_misc_sup:stop_net_if(),
    ok.


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

handle_sync_get(Pid, UserId, TargetName, CtxName, Oids, Timeout, ExtraInfo, 
		From, State) ->    
    SendOpts = 
	[
	 {context, CtxName},
	 {timeout, Timeout},
	 {extra,   ExtraInfo}
	],
    handle_sync_get(Pid, UserId, TargetName, Oids, SendOpts, From, State).

handle_sync_get(Pid, UserId, TargetName, Oids, SendOpts, From, State) -> 
    ?vtrace("handle_sync_get -> entry with"
	    "~n   Pid:        ~p"
	    "~n   UserId:     ~p"
	    "~n   TargetName: ~p"
	    "~n   Oids:       ~p"
	    "~n   SendOpts:   ~p"
	    "~n   From:       ~p", 
	    [Pid, UserId, TargetName, Oids, SendOpts, From]),
    case agent_data(TargetName, SendOpts) of
	{ok, RegType, Domain, Addr, Port, Vsn, MsgData} ->
	    ?vtrace("handle_sync_get -> send a ~p message", [Vsn]),
	    Extra   = ?GET_EXTRA(SendOpts), 
	    ReqId   = send_get_request(Oids, Vsn, MsgData, 
				       Domain, Addr, Port, 
				       Extra, State),
	    ?vdebug("handle_sync_get -> ReqId: ~p", [ReqId]),
	    Msg     = {sync_timeout, ReqId, From},
	    Timeout = ?SYNC_GET_TIMEOUT(SendOpts), 
	    Ref     = erlang:send_after(Timeout, self(), Msg),
	    MonRef  = erlang:monitor(process, Pid),
	    ?vtrace("handle_sync_get -> MonRef: ~p", [MonRef]),
	    Req     = #request{id       = ReqId,
			       user_id  = UserId, 
			       reg_type = RegType, 
			       target   = TargetName, 
			       domain   = Domain, 
			       addr     = Addr,
			       port     = Port,
			       type     = get, 
			       data     = MsgData, 
			       ref      = Ref, 
			       mon      = MonRef, 
			       from     = From},
	    ets:insert(snmpm_request_table, Req),
	    ok;
	Error ->
	    ?vinfo("failed retrieving agent data for get:"
		   "~n   TargetName: ~p"
		   "~n   Error:      ~p", [TargetName, Error]),
	    Error
    end.
    
handle_sync_get_next(Pid, UserId, TargetName, CtxName, Oids, Timeout, 
		     ExtraInfo, From, State) ->
    SendOpts = 
	[
	 {context, CtxName},
	 {timeout, Timeout},
	 {extra,   ExtraInfo}
	],
    handle_sync_get_next(Pid, UserId, TargetName, Oids, SendOpts, From, State).

handle_sync_get_next(Pid, UserId, TargetName, Oids, SendOpts, 
		     From, State) ->
    ?vtrace("handle_sync_get_next -> entry with"
	    "~n   Pid:        ~p"
	    "~n   UserId:     ~p"
	    "~n   TargetName: ~p"
	    "~n   Oids:       ~p"
	    "~n   SendOpts:   ~p"
	    "~n   From:       ~p", 
	    [Pid, UserId, TargetName, Oids, SendOpts, From]),
    case agent_data(TargetName, SendOpts) of
	{ok, RegType, Domain, Addr, Port, Vsn, MsgData} ->
	    ?vtrace("handle_sync_get_next -> send a ~p message", [Vsn]),
	    Extra   = ?GET_EXTRA(SendOpts), 
	    ReqId   = send_get_next_request(Oids, Vsn, MsgData, 
					    Domain, Addr, Port, 
					    Extra, State),
	    ?vdebug("handle_sync_get_next -> ReqId: ~p", [ReqId]),
	    Msg     = {sync_timeout, ReqId, From},
	    Timeout = ?SYNC_GET_NEXT_TIMEOUT(SendOpts), 
	    Ref     = erlang:send_after(Timeout, self(), Msg),
	    MonRef  = erlang:monitor(process, Pid),
	    ?vtrace("handle_sync_get_next -> MonRef: ~p", [MonRef]),
	    Req     = #request{id       = ReqId,
			       user_id  = UserId, 
			       reg_type = RegType, 
			       target   = TargetName, 
			       domain   = Domain, 
			       addr     = Addr,
			       port     = Port,
			       type     = get_next, 
			       data     = MsgData, 
			       ref      = Ref, 
			       mon      = MonRef, 
			       from     = From},
	    ets:insert(snmpm_request_table, Req),
	    ok;

	Error ->
	    ?vinfo("failed retrieving agent data for get-next:"
		   "~n   TargetName: ~p"
		   "~n   Error:      ~p", [TargetName, Error]),
	    Error
    end.


handle_sync_get_bulk(Pid, UserId, TargetName, CtxName, 
		     NonRep, MaxRep, Oids, Timeout, 
		     ExtraInfo, From, State) ->
    SendOpts = 
	[
	 {context, CtxName},
	 {timeout, Timeout},
	 {extra,   ExtraInfo}
	],
    handle_sync_get_bulk(Pid, UserId, TargetName, NonRep, MaxRep, Oids, 
			 SendOpts, From, State).

handle_sync_get_bulk(Pid, UserId, TargetName, NonRep, MaxRep, Oids, SendOpts, 
		     From, State) ->
    ?vtrace("handle_sync_get_bulk -> entry with"
	    "~n   Pid:        ~p"
	    "~n   UserId:     ~p"
	    "~n   TargetName: ~p"
	    "~n   NonRep:     ~p"
	    "~n   MaxRep:     ~p"
	    "~n   Oids:       ~p"
	    "~n   SendOpts:   ~p"
	    "~n   From:       ~p", 
	    [Pid, UserId, TargetName, NonRep, MaxRep, Oids, SendOpts, From]),
    case agent_data(TargetName, SendOpts) of
	{ok, RegType, Domain, Addr, Port, Vsn, MsgData} ->
	    ?vtrace("handle_sync_get_bulk -> send a ~p message", [Vsn]),
	    Extra   = ?GET_EXTRA(SendOpts), 
	    ReqId   = send_get_bulk_request(Oids, Vsn, MsgData, 
					    Domain, Addr, Port, 
					    NonRep, MaxRep, Extra, State),
	    ?vdebug("handle_sync_get_bulk -> ReqId: ~p", [ReqId]),
	    Msg     = {sync_timeout, ReqId, From},
	    Timeout = ?SYNC_GET_BULK_TIMEOUT(SendOpts), 
	    Ref     = erlang:send_after(Timeout, self(), Msg),
	    MonRef  = erlang:monitor(process, Pid),
	    ?vtrace("handle_sync_get_bulk -> MonRef: ~p", [MonRef]),
	    Req     = #request{id       = ReqId,
			       user_id  = UserId, 
			       reg_type = RegType, 
			       target   = TargetName, 
			       domain   = Domain, 
			       addr     = Addr,
			       port     = Port,
			       type     = get_bulk, 
			       data     = MsgData, 
			       ref      = Ref, 
			       mon      = MonRef, 
			       from     = From},
	    ets:insert(snmpm_request_table, Req),
	    ok;

	Error ->
	    ?vinfo("failed retrieving agent data for get-bulk:"
		   "~n   TargetName: ~p"
		   "~n   Error:      ~p", [TargetName, Error]),
	    Error
    end.


handle_sync_set(Pid, UserId, TargetName, CtxName, VarsAndVals, Timeout, 
		ExtraInfo, From, State) ->
    SendOpts = 
	[
	 {context, CtxName},
	 {timeout, Timeout},
	 {extra,   ExtraInfo}
	],
    handle_sync_set(Pid, UserId, TargetName, VarsAndVals, SendOpts, 
		    From, State).

handle_sync_set(Pid, UserId, TargetName, VarsAndVals, SendOpts, From, State) ->
    ?vtrace("handle_sync_set -> entry with"
	    "~n   Pid:         ~p"
	    "~n   UserId:      ~p"
	    "~n   TargetName:  ~p"
	    "~n   VarsAndVals: ~p"
	    "~n   SendOpts:    ~p"
	    "~n   From:        ~p", 
	    [Pid, UserId, TargetName, VarsAndVals, From]),
    case agent_data(TargetName, SendOpts) of
	{ok, RegType, Domain, Addr, Port, Vsn, MsgData} ->
	    ?vtrace("handle_sync_set -> send a ~p message", [Vsn]),
	    Extra   = ?GET_EXTRA(SendOpts), 
	    ReqId   = send_set_request(VarsAndVals, Vsn, MsgData, 
				       Domain, Addr, Port, 
				       Extra, State),
	    ?vdebug("handle_sync_set -> ReqId: ~p", [ReqId]),
	    Msg     = {sync_timeout, ReqId, From},
	    Timeout = ?SYNC_SET_TIMEOUT(SendOpts), 
	    Ref     = erlang:send_after(Timeout, self(), Msg),
            MonRef  = erlang:monitor(process, Pid),
	    ?vtrace("handle_sync_set -> MonRef: ~p", [MonRef]),
	    Req     = #request{id       = ReqId,
			       user_id  = UserId, 
			       reg_type = RegType, 
			       target   = TargetName, 
			       domain   = Domain, 
			       addr     = Addr,
			       port     = Port,
			       type     = set, 
			       data     = MsgData, 
			       ref      = Ref, 
			       mon      = MonRef, 
			       from     = From},
	    ets:insert(snmpm_request_table, Req),
	    ok;

	Error ->
	    ?vinfo("failed retrieving agent data for set:"
		   "~n   TargetName: ~p"
		   "~n   Error:      ~p", [TargetName, Error]),
	    Error
    end.

 
handle_async_get(Pid, UserId, TargetName, CtxName, Oids, Expire, ExtraInfo, 
		 State) ->
    SendOpts = 
	[
	 {context, CtxName},
	 {timeout, Expire},
	 {extra,   ExtraInfo}
	],
    handle_async_get(Pid, UserId, TargetName, Oids, SendOpts, State).

handle_async_get(Pid, UserId, TargetName, Oids, SendOpts, State) ->
    ?vtrace("handle_async_get -> entry with"
	    "~n   Pid:        ~p"
	    "~n   UserId:     ~p"
	    "~n   TargetName: ~p"
	    "~n   Oids:       ~p"
	    "~n   SendOpts:   ~p",
	    [Pid, UserId, TargetName, Oids, SendOpts]),
    case agent_data(TargetName, SendOpts) of
	{ok, RegType, Domain, Addr, Port, Vsn, MsgData} ->
	    ?vtrace("handle_async_get -> send a ~p message", [Vsn]),
	    Extra  = ?GET_EXTRA(SendOpts), 
	    ReqId  = send_get_request(Oids, Vsn, MsgData, 
				      Domain, Addr, Port, 
				      Extra, State),
	    ?vdebug("handle_async_get -> ReqId: ~p", [ReqId]),
	    Expire = ?ASYNC_GET_TIMEOUT(SendOpts), 
	    Req    = #request{id       = ReqId,
			      user_id  = UserId, 
			      reg_type = RegType, 
			      target   = TargetName, 
			      domain   = Domain, 
			      addr     = Addr,
			      port     = Port,
			      type     = get, 
			      data     = MsgData, 
			      expire   = t() + Expire},

	    ets:insert(snmpm_request_table, Req),
	    gct_activate(State#state.gct),
	    {ok, ReqId};

	Error ->
	    ?vinfo("failed retrieving agent data for get:"
		   "~n   TargetName: ~p"
		   "~n   Error:      ~p", [TargetName, Error]),
	    Error
    end.


handle_async_get_next(Pid, UserId, TargetName, CtxName, Oids, Expire, 
		      ExtraInfo, State) ->
    SendOpts = 
	[
	 {context, CtxName},
	 {timeout, Expire},
	 {extra,   ExtraInfo}
	],
    handle_async_get_next(Pid, UserId, TargetName, Oids, SendOpts, State).

handle_async_get_next(Pid, UserId, TargetName, Oids, SendOpts, State) ->
    ?vtrace("handle_async_get_next -> entry with"
	    "~n   Pid:        ~p"
	    "~n   UserId:     ~p"
	    "~n   TargetName: ~p"
	    "~n   Oids:       ~p"
	    "~n   SendOpts:   ~p",
	    [Pid, UserId, TargetName, Oids, SendOpts]),
    case agent_data(TargetName, SendOpts) of
	{ok, RegType, Domain, Addr, Port, Vsn, MsgData} ->
	    ?vtrace("handle_async_get_next -> send a ~p message", [Vsn]),
	    Extra  = ?GET_EXTRA(SendOpts), 
	    ReqId  = send_get_next_request(Oids, Vsn, MsgData, 
					   Domain, Addr, Port, 
					   Extra, State),
	    ?vdebug("handle_async_get_next -> ReqId: ~p", [ReqId]),
	    Expire = ?ASYNC_GET_NEXT_TIMEOUT(SendOpts), 
	    Req    = #request{id       = ReqId,
			      user_id  = UserId, 
			      reg_type = RegType, 
			      target   = TargetName, 
			      domain   = Domain, 
			      addr     = Addr,
			      port     = Port,
			      type     = get_next, 
			      data     = MsgData, 
			      expire   = t() + Expire},

	    ets:insert(snmpm_request_table, Req),
	    gct_activate(State#state.gct),
	    {ok, ReqId};

	Error ->
	    ?vinfo("failed retrieving agent data for get-next:"
		   "~n   TargetName: ~p"
		   "~n   Error:      ~p", [TargetName, Error]),
	    Error
    end.


handle_async_get_bulk(Pid, UserId, TargetName, CtxName, 
		      NonRep, MaxRep, Oids, Expire, 
		      ExtraInfo, State) ->
    SendOpts = 
	[
	 {context, CtxName},
	 {timeout, Expire},
	 {extra,   ExtraInfo}
	],
    handle_async_get_bulk(Pid, 
			  UserId, TargetName, NonRep, MaxRep, Oids, SendOpts, 
			  State).

handle_async_get_bulk(Pid, 
		      UserId, TargetName, NonRep, MaxRep, Oids, SendOpts, 
		      State) ->
    ?vtrace("handle_async_get_bulk -> entry with"
	    "~n   Pid:        ~p"
	    "~n   UserId:     ~p"
	    "~n   TargetName: ~p"
	    "~n   NonRep:     ~p"
	    "~n   MaxRep:     ~p"
	    "~n   Oids:       ~p"
	    "~n   SendOpts:   ~p", 
	    [Pid, UserId, TargetName, NonRep, MaxRep, Oids, SendOpts]),
    case agent_data(TargetName, SendOpts) of
	{ok, RegType, Domain, Addr, Port, Vsn, MsgData} ->
	    ?vtrace("handle_async_get_bulk -> send a ~p message", [Vsn]),
	    Extra  = ?GET_EXTRA(SendOpts), 
	    ReqId  = send_get_bulk_request(Oids, Vsn, MsgData, 
					   Domain, Addr, Port, 
					   NonRep, MaxRep, Extra, State),
	    ?vdebug("handle_async_get_bulk -> ReqId: ~p", [ReqId]),
	    Expire = ?ASYNC_GET_BULK_TIMEOUT(SendOpts), 
	    Req    = #request{id       = ReqId,
			      user_id  = UserId, 
			      reg_type = RegType, 
			      target   = TargetName, 
			      domain   = Domain, 
			      addr     = Addr,
			      port     = Port,
			      type     = get_bulk, 
			      data     = MsgData, 
			      expire   = t() + Expire},
	    ets:insert(snmpm_request_table, Req),
	    gct_activate(State#state.gct),
	    {ok, ReqId};

	Error ->
	    ?vinfo("failed retrieving agent data for get-bulk:"
		   "~n   TargetName: ~p"
		   "~n   Error:      ~p", [TargetName, Error]),
	    Error
    end.


handle_async_set(Pid, UserId, TargetName, CtxName, VarsAndVals, Expire, 
		 ExtraInfo, State) ->
    SendOpts = 
	[
	 {context, CtxName},
	 {timeout, Expire},
	 {extra,   ExtraInfo}
	],
    handle_async_set(Pid, UserId, TargetName, VarsAndVals, SendOpts, State).

handle_async_set(Pid, UserId, TargetName, VarsAndVals, SendOpts, State) ->
    ?vtrace("handle_async_set -> entry with"
	    "~n   Pid:         ~p"
	    "~n   UserId:      ~p"
	    "~n   TargetName:  ~p"
	    "~n   VarsAndVals: ~p"
	    "~n   SendOpts:    ~p",
	    [Pid, UserId, TargetName, VarsAndVals, SendOpts]),
    case agent_data(TargetName, SendOpts) of
	{ok, RegType, Domain, Addr, Port, Vsn, MsgData} ->
	    ?vtrace("handle_async_set -> send a ~p message", [Vsn]),
	    Extra  = ?GET_EXTRA(SendOpts), 
	    ReqId  = send_set_request(VarsAndVals, Vsn, MsgData, 
				      Domain, Addr, Port, 
				      Extra, State),
	    ?vdebug("handle_async_set -> ReqId: ~p", [ReqId]),
	    Expire = ?ASYNC_SET_TIMEOUT(SendOpts), 
	    Req    = #request{id       = ReqId,
			      user_id  = UserId, 
			      reg_type = RegType, 
			      target   = TargetName, 
			      domain   = Domain, 
			      addr     = Addr,
			      port     = Port,
			      type     = set, 
			      data     = MsgData, 
			      expire   = t() + Expire},

	    ets:insert(snmpm_request_table, Req),
	    gct_activate(State#state.gct),
	    {ok, ReqId};

	Error ->
	    ?vinfo("failed retrieving agent data for set:"
		   "~n   TargetName: ~p"
		   "~n   Error:      ~p", [TargetName, Error]),
	    Error
    end.


handle_cancel_async_request(UserId, ReqId, _State) ->
    ?vtrace("handle_cancel_async_request -> entry with"
	    "~n   UserId: ~p"
	    "~n   ReqId:  ~p", [UserId, ReqId]),
    case ets:lookup(snmpm_request_table, ReqId) of
	[#request{user_id = UserId,
		  ref     = Ref}] ->
	    ?vdebug("handle_cancel_async_request -> demonitor and cancel timer"
		    "~n   Ref: ~p", [Ref]),
	    cancel_timer(Ref),
	    ets:delete(snmpm_request_table, ReqId),
	    ok;
	
	[#request{user_id = OtherUserId}] ->
	    ?vinfo("handle_cancel_async_request -> Not request owner"
		    "~n   OtherUserId: ~p", [OtherUserId]),
	    {error, {not_owner, OtherUserId}};
	
	[] ->
	    ?vlog("handle_cancel_async_request -> not found", []),
	    {error, not_found}
    end.
    

%% handle_system_info_updated(#state{net_if = Pid, net_if_mod = Mod} = _State,
%% 			   net_if = _Target, What) ->
%%     case (catch Mod:system_info_updated(Pid, What)) of
%% 	{'EXIT', _} ->
%% 	    {error, not_supported};
%% 	Else ->
%% 	    Else
%%     end;
%% handle_system_info_updated(_State, Target, What) ->
%%     {error, {bad_target, Target, What}}.

handle_get_log_type(#state{net_if = Pid, net_if_mod = Mod}) ->
    case (catch Mod:get_log_type(Pid)) of
	{'EXIT', _} ->
	    {error, not_supported};
	Else ->
	    Else
    end.

handle_set_log_type(#state{net_if = Pid, net_if_mod = Mod}, NewType) ->
    case (catch Mod:set_log_type(Pid, NewType)) of
	{'EXIT', _} ->
	    {error, not_supported};
	Else ->
	    Else
    end.


%% handle_discovery(Pid, UserId, BAddr, Port, Config, Expire, ExtraInfo, State) ->
%%     ?vtrace("handle_discovery -> entry with"
%% 	    "~n   Pid:         ~p"
%% 	    "~n   UserId:      ~p"
%% 	    "~n   BAddr:       ~p"
%% 	    "~n   Port:        ~p"
%% 	    "~n   Config:      ~p"
%% 	    "~n   Expire:      ~p",
%% 	    [Pid, UserId, BAddr, Port, Config, Expire]),
%%     case agent_data(default, default, "", Config) of
%% 	{ok, Addr, Port, Vsn, MsgData} ->
%% 	    ?vtrace("handle_discovery -> send a ~p disco message", [Vsn]),
%% 	    ReqId  = send_discovery(Vsn, MsgData, BAddr, Port, ExtraInfo, 
%% 				    State),
%% 	    ?vdebug("handle_discovery -> ReqId: ~p", [ReqId]),
%% 	    MonRef = erlang:monitor(process, Pid),
%% 	    ?vtrace("handle_discovery -> MonRef: ~p", [MonRef]),
%% 	    Req    = #request{id        = ReqId,
%% 			      user_id   = UserId, 
%%			      target    = TargetName, 
%% 			      addr      = BAddr, 
%% 			      port      = Port,
%% 			      type      = get, 
%% 			      data      = MsgData, 
%% 			      mon       = MonRef,
%% 			      discovery = true, 
%% 			      expire    = t() + Expire},
%% 	    ets:insert(snmpm_request_table, Req),
%% 	    gct_activate(State#state.gct),
%% 	    {ok, ReqId};

%% 	Error ->
%% 	    ?vinfo("failed retrieving agent data for discovery (get):"
%% 		   "~n   BAddr: ~p"
%% 		   "~n   Port:  ~p"
%% 		   "~n   Error: ~p", [BAddr, Port, Error]),
%% 	    Error
%%     end.


handle_sync_timeout(ReqId, From, State) ->
    ?vtrace("handle_sync_timeout -> entry with"
	    "~n   ReqId: ~p"
	    "~n   From:  ~p", [ReqId, From]),
    case ets:lookup(snmpm_request_table, ReqId) of
	[#request{mon = MonRef, from = From} = Req0] ->
	    ?vdebug("handle_sync_timeout -> "
		    "deliver reply (timeout) and demonitor: "
		    "~n   Monref: ~p"
		    "~n   From:   ~p", [MonRef, From]),
	    gen_server:reply(From, {error, {timeout, ReqId}}),
	    maybe_demonitor(MonRef),
	    
	    %% 
	    %% Instead of deleting the request record now,
	    %% we leave it to the gc. But for that to work 
	    %% we must update the expire value (which for
	    %% sync requests is infinity).
	    %% 

	    Req = Req0#request{ref    = undefined, 
			       mon    = undefined, 
			       from   = undefined, 
			       expire = t()},
	    ets:insert(snmpm_request_table, Req),
	    gct_activate(State#state.gct),
	    ok;
	_ ->
	    ok
    end.

    
handle_snmp_error(#pdu{request_id = ReqId} = Pdu, Reason, State) ->

    ?vtrace("handle_snmp_error -> entry with"
	    "~n   Reason: ~p"
	    "~n   Pdu:    ~p", [Reason, Pdu]),

    case ets:lookup(snmpm_request_table, ReqId) of

	%% Failed async request
	[#request{user_id   = UserId, 
		  from      = undefined, 
		  ref       = undefined, 
		  mon       = MonRef,
		  discovery = Disco}] ->

	    ?vdebug("handle_snmp_error -> "
		    "found corresponding request: "
		    "~n   failed async request"
		    "~n   UserId: ~p"
		    "~n   ModRef: ~p"
		    "~n   Disco:  ~p", [UserId, MonRef, Disco]),

	    maybe_demonitor(MonRef),
	    case snmpm_config:user_info(UserId) of
		{ok, UserMod, UserData} ->
		    handle_error(UserId, UserMod, Reason, ReqId, 
				 UserData, State),
		    maybe_delete(Disco, ReqId);
		_ ->
		    %% reply to outstanding request, for which there is no
		    %% longer any owner (the user has unregistered).
		    %% Therefor send it to the default user
		    case snmpm_config:user_info() of
			{ok, DefUserId, DefMod, DefData} ->
			    handle_error(DefUserId, DefMod, Reason, ReqId, 
					 DefData, State),
			    maybe_delete(Disco, ReqId);
			_ ->
			    error_msg("failed retreiving the default user "
				      "info handling error [~w]: "
				      "~n~w", [ReqId, Reason])
		    end
	    end;


	%% Failed sync request
	%%
	[#request{ref = Ref, mon = MonRef, from = From}] -> 

	    ?vdebug("handle_snmp_error -> "
		    "found corresponding request: "
		    "~n   failed sync request"
		    "~n   Ref:    ~p"
		    "~n   ModRef: ~p"
		    "~n   From:   ~p", [Ref, MonRef, From]),

	    Remaining = 
		case (catch cancel_timer(Ref)) of
		    Rem when is_integer(Rem) ->
			Rem;
		    _ ->
			0
		end,

	    ?vtrace("handle_snmp_error -> Remaining: ~p", [Remaining]),

	    maybe_demonitor(MonRef),
	    Reply = {error, {send_failed, ReqId, Reason}},
	    ?vtrace("handle_snmp_error -> deliver (error-) reply",[]), 
	    gen_server:reply(From, Reply),
	    ets:delete(snmpm_request_table, ReqId),
	    ok;


	%% A very old reply, see if this agent is handled by
	%% a user. In that case send it there, else to the 
	%% default user.
	_ ->

	    ?vdebug("handle_snmp_error -> no request?", []), 

	    case snmpm_config:user_info() of
		{ok, DefUserId, DefMod, DefData} ->
		    handle_error(DefUserId, DefMod, Reason, 
				 ReqId, DefData, State);
		_ ->
		    error_msg("failed retreiving the default "
			      "user info handling error [~w]: "
			      "~n~w",[ReqId, Reason])
	    end
    end;

handle_snmp_error(CrapError, Reason, _State) ->
    error_msg("received crap (snmp) error =>"
	      "~n~p~n~p", [CrapError, Reason]),
    ok.

handle_snmp_error(Addr, Port, ReqId, Reason, State) ->

    ?vtrace("handle_snmp_error -> entry with"
	    "~n   Addr:   ~p"
	    "~n   Port:   ~p"
	    "~n   ReqId:  ~p"
	    "~n   Reason: ~p", [Addr, Port, ReqId, Reason]),

    case snmpm_config:get_agent_user_id(Addr, Port) of
	{ok, UserId} ->
	    case snmpm_config:user_info(UserId) of
		{ok, UserMod, UserData} ->
		    handle_error(UserId, UserMod, Reason, ReqId, 
				 UserData, State);
		_Error ->
		    case snmpm_config:user_info() of
			{ok, DefUserId, DefMod, DefData} ->
			    handle_error(DefUserId, DefMod, Reason, 
					 ReqId, DefData, State);
			_Error ->
			    error_msg("failed retreiving the default user "
				      "info handling snmp error "
				      "<~p,~p>: ~n~w~n~w",
				      [Addr, Port, ReqId, Reason])
		    end
	    end;
	_Error ->
	    case snmpm_config:user_info() of
		{ok, DefUserId, DefMod, DefData} ->
		    handle_error(DefUserId, DefMod, Reason, 
				 ReqId, DefData, State);
		_Error ->
		    error_msg("failed retreiving the default user "
			      "info handling snmp error "
			      "<~p,~p>: ~n~w~n~w",
			      [Addr, Port, ReqId, Reason])
	    end
    end.


handle_error(_UserId, Mod, Reason, ReqId, Data, _State) ->
    ?vtrace("handle_error -> entry when"
	    "~n   Mod: ~p", [Mod]),
    F = fun() -> (catch Mod:handle_error(ReqId, Reason, Data)) end,
    handle_callback(F),
    ok.


handle_snmp_pdu(#pdu{type = 'get-response', request_id = ReqId} = Pdu, 
		Addr, Port, State) ->

    ?vtrace("handle_snmp_pdu(get-response) -> entry with"
	    "~n   Addr: ~p"
	    "~n   Port: ~p"
	    "~n   Pdu:  ~p", [Addr, Port, Pdu]),

    case ets:lookup(snmpm_request_table, ReqId) of

	%% Reply to a async request or 
	%% possibly a late reply to a sync request
	%% (ref is also undefined)
	[#request{user_id   = UserId, 
		  reg_type  = RegType, 
		  target    = Target, 
		  from      = undefined, 
		  ref       = undefined, 
		  mon       = MonRef,
		  discovery = Disco}] ->

	    ?vdebug("handle_snmp_pdu(get-response) -> "
		    "found corresponding request: "
		    "~n   reply to async request or late reply to sync request"
		    "~n   UserId: ~p"
		    "~n   ModRef: ~p"
		    "~n   Disco:  ~p", [UserId, MonRef, Disco]),

	    maybe_demonitor(MonRef),
	    #pdu{error_status = EStatus, 
		 error_index  = EIndex, 
		 varbinds     = Varbinds} = Pdu,
	    Varbinds2 = fix_vbs_BITS(Varbinds), 
	    SnmpResponse = {EStatus, EIndex, Varbinds2},
	    case snmpm_config:user_info(UserId) of
		{ok, UserMod, UserData} ->
		    handle_pdu(UserId, UserMod, 
			       RegType, Target, Addr, Port, 
			       ReqId, SnmpResponse, UserData, State),
		    maybe_delete(Disco, ReqId);
		_Error ->
		    %% reply to outstanding request, for which there is no
		    %% longer any owner (the user has unregistered).
		    %% Therefor send it to the default user
		    case snmpm_config:user_info() of
			{ok, DefUserId, DefMod, DefData} ->
			    handle_pdu(DefUserId, DefMod, 
				       RegType, Target, Addr, Port, 
				       ReqId, SnmpResponse, DefData, State),
			    maybe_delete(Disco, ReqId);
			Error ->
			    error_msg("failed retreiving the default user "
				      "info handling pdu from "
				      "~p <~p,~p>: ~n~w~n~w",
				      [Target, Addr, Port, Error, Pdu])
		    end
	    end;


	%% Reply to a sync request
	%%
	[#request{ref = Ref, mon = MonRef, from = From}] -> 

	    ?vdebug("handle_snmp_pdu(get-response) -> "
		    "found corresponding request: "
		    "~n   reply to sync request"
		    "~n   Ref:    ~p"
		    "~n   ModRef: ~p"
		    "~n   From:   ~p", [Ref, MonRef, From]),

	    Remaining = 
		case (catch cancel_timer(Ref)) of
		    Rem when is_integer(Rem) ->
			Rem;
		    _ ->
			0
		end,

	    ?vtrace("handle_snmp_pdu(get-response) -> Remaining: ~p", 
		    [Remaining]),

	    maybe_demonitor(MonRef),
	    #pdu{error_status = EStatus, 
		 error_index  = EIndex, 
		 varbinds     = Varbinds} = Pdu,
	    Varbinds2 = fix_vbs_BITS(Varbinds), 
	    SnmpReply = {EStatus, EIndex, Varbinds2},
	    Reply = {ok, SnmpReply, Remaining},
	    ?vtrace("handle_snmp_pdu(get-response) -> deliver reply",[]), 
	    gen_server:reply(From, Reply),
	    ets:delete(snmpm_request_table, ReqId),
	    ok;
		

	%% A very old reply, see if this agent is handled by
	%% a user. In that case send it there, else to the 
	%% default user.
	_ ->

	    ?vdebug("handle_snmp_pdu(get-response) -> "
		    "no corresponding request: "
		    "~n   a very old reply", []),

	    #pdu{error_status = EStatus, 
		 error_index  = EIndex, 
		 varbinds     = Varbinds} = Pdu,
	    Varbinds2 = fix_vbs_BITS(Varbinds), 
	    SnmpInfo = {EStatus, EIndex, Varbinds2},
	    case snmpm_config:get_agent_user_id(Addr, Port) of
		{ok, UserId} ->
		    %% A very late reply or a reply to a request
		    %% that has been cancelled.
		    %% 
		    ?vtrace("handle_snmp_pdu(get-response) -> "
			    "a very late reply:"
			    "~n   UserId: ~p",[UserId]), 
		    case snmpm_config:user_info(UserId) of
			{ok, UserMod, UserData} ->
			    Reason = {unexpected_pdu, SnmpInfo},
			    handle_error(UserId, UserMod, Reason, ReqId, 
					 UserData, State);
			_Error ->
			    %% Ouch, found an agent but not it's user!!
			    case snmpm_config:user_info() of
				{ok, DefUserId, DefMod, DefData} ->
				    Reason = {unexpected_pdu, SnmpInfo}, 
				    handle_error(DefUserId, DefMod, Reason, 
						 ReqId, DefData, State);
				Error ->
				    error_msg("failed retreiving the default "
					      "user info handling (old) "
					      "pdu from "
					      "<~p,~p>: ~n~w~n~w",
					      [Addr, Port, Error, Pdu])
			    end
		    end;

		{error, _} -> 
		    %% No agent, so either this agent has been 
		    %% unregistered, or this is a very late reply 
		    %% to a request (possibly a discovery), which 
		    %% has since been cancelled (either because of
		    %% a timeout or that the user has unregistered 
		    %% itself (and with it all it's requests)). 
		    %% No way to know which.
		    %% 
		    ?vtrace("handle_snmp_pdu(get-response) -> "
			    "no agent info found", []),
		    case snmpm_config:user_info() of
			{ok, DefUserId, DefMod, DefData} ->
			    handle_agent(DefUserId, DefMod, 
					 Addr, Port, 
					 pdu, ignore, 
					 SnmpInfo, DefData, State);
			Error ->
			    error_msg("failed retreiving the default user "
				      "info handling (old) pdu when no user "
				      "found from "
				      "<~p,~p>: ~n~w~n~w",
				      [Addr, Port, Error, Pdu])
		    end
	    end
    end;

handle_snmp_pdu(CrapPdu, Addr, Port, _State) ->
    error_msg("received crap (snmp) Pdu from ~w:~w =>"
	      "~p", [Addr, Port, CrapPdu]),
    ok.


handle_pdu(_UserId, Mod, target_name = _RegType, TargetName, _Addr, _Port, 
	   ReqId, SnmpResponse, Data, _State) ->
    ?vtrace("handle_pdu(target_name) -> entry when"
	    "~n   Mod: ~p", [Mod]),
    F = fun() ->
		(catch Mod:handle_pdu(TargetName, ReqId, SnmpResponse, Data))
	end,
    handle_callback(F),
    ok;
handle_pdu(_UserId, Mod, addr_port = _RegType, _TargetName, Addr, Port, 
	   ReqId, SnmpResponse, Data, _State) ->
    ?vtrace("handle_pdu(addr_port) -> entry when"
	    "~n   Mod: ~p", [Mod]),
    F = fun() ->
		(catch Mod:handle_pdu(Addr, Port, ReqId, SnmpResponse, Data))
	end,
    handle_callback(F),
    ok.


handle_agent(UserId, Mod, Addr, Port, Type, Ref, SnmpInfo, Data, State) ->
    ?vtrace("handle_agent -> entry when"
	    "~n   UserId: ~p"
	    "~n   Type:   ~p"
	    "~n   Mod:    ~p", [UserId, Type, Mod]),
    F = fun() ->
		do_handle_agent(UserId, Mod, Addr, Port, 
				Type, Ref, SnmpInfo, Data, State)
	end,
    handle_callback(F),
    ok.

do_handle_agent(DefUserId, DefMod, 
		Addr, Port, 
		Type, Ref, 
		SnmpInfo, DefData, State) ->
    ?vdebug("do_handle_agent -> entry when"
	    "~n   DefUserId: ~p", [DefUserId]),
    case (catch DefMod:handle_agent(Addr, Port, Type, SnmpInfo, DefData)) of
	{'EXIT', {undef, _}} when Type =:= pdu ->
	    %% Maybe, still on the old API
	    ?vdebug("do_handle_agent -> maybe still on the old api", []),
	    case (catch DefMod:handle_agent(Addr, Port, SnmpInfo, DefData)) of
		{register, UserId2, Config} ->  
		    ?vtrace("do_handle_agent -> register: "
			    "~n   UserId2: ~p"
			    "~n   Config:  ~p", [UserId2, Config]),
		    TargetName = mk_target_name(Addr, Port, Config),
		    Config2    = [{reg_type, addr_port}, 
				  {address,  Addr}, 
				  {port,     Port} | Config], 
		    case snmpm_config:register_agent(UserId2, 
						     TargetName, Config2) of
			ok ->
			    ok;
			{error, Reason} ->
			    error_msg("failed registering agent - "
				      "handling agent "
				      "~p <~p,~p>: ~n~w", 
				      [TargetName, Addr, Port, Reason]),
			    ok
		    end;
		{register, UserId2, TargetName, Config} ->  
		    ?vtrace("do_handle_agent -> register: "
			    "~n   UserId2:    ~p"
			    "~n   TargetName: ~p"
			    "~n   Config:     ~p", 
			    [UserId2, TargetName, Config]),
		    Config2 = ensure_present([{address, Addr}, {port, Port}], 
					     Config),
		    Config3 = [{reg_type, target_name} | Config2], 
		    case snmpm_config:register_agent(UserId2, 
						     TargetName, Config3) of
			ok ->
			    ok;
			{error, Reason} ->
			    error_msg("failed registering agent - "
				      "handling agent "
				      "~p <~p,~p>: ~n~w", 
				      [TargetName, Addr, Port, Reason]),
			    ok
		    end;
		_Ignore ->
		    ?vdebug("do_handle_agent -> ignore", []),
		    ok
	    end;

	{'EXIT', {undef, _}} ->
	    %% If the user does not implement the new API (but the
	    %% old), then this clause catches all non-pdu handle_agent 
	    %% calls. These calls was previously never made,so we make 
	    %% a best-effert call (using reg-type target_name) to the 
	    %% various callback functions, and leave it to the user to
	    %% figure out

	    %% Backward compatibillity crap
	    RegType = target_name,
	    Target  = mk_target_name(Addr, Port, default_agent_config()),
	    case Type of
		report ->
		    SnmpInform = SnmpInfo, 
		    handle_report(DefUserId, DefMod, 
				  RegType, Target, Addr, Port, 
				  SnmpInform, DefData, State);

		inform ->
		    SnmpInform = SnmpInfo, 
		    handle_inform(DefUserId, DefMod, Ref, 
				  RegType, Target, Addr, Port, 
				  SnmpInform, DefData, State);

		trap ->
		    SnmpTrapInfo = SnmpInfo, 
		    handle_trap(DefUserId, DefMod, 
				RegType, Target, Addr, Port, 
				SnmpTrapInfo, DefData, State);

		_ ->
		    error_msg("failed delivering ~w info to default user - "
			      "regarding agent "
			      "<~p,~p>: ~n~w", [Type, Addr, Port, SnmpInfo])
	    end;

	{register, UserId2, TargetName, Config} ->  
	    ?vtrace("do_handle_agent -> register: "
		    "~n   UserId2:    ~p"
		    "~n   TargetName: ~p"
		    "~n   Config:     ~p", 
		    [UserId2, TargetName, Config]),
	    Config2 = ensure_present([{address, Addr}, {port, Port}], Config),
	    Config3 = [{reg_type, target_name} | Config2], 
	    case snmpm_config:register_agent(UserId2, 
					     TargetName, Config3) of
		ok ->
		    ok;
		{error, Reason} ->
		    error_msg("failed registering agent - "
			      "handling agent "
			      "~p <~p,~p>: ~n~w", 
			      [TargetName, Addr, Port, Reason]),
		    ok
	    end;
	
	_Ignore ->
	    ?vdebug("do_handle_agent -> ignore", []),
	    ok

    end.

ensure_present([], Config) ->
    Config;
ensure_present([{Key, _Val} = Elem|Ensure], Config) ->
    case lists:keymember(Key, 1, Config) of
	false ->
	    ensure_present(Ensure, [Elem|Config]);
	true ->
	    ensure_present(Ensure, Config)
    end.
    
    
%% Retrieve user info for this agent.
%% If this is an unknown agent, then use the default user
handle_snmp_trap(#trappdu{enterprise    = Enteprise, 
			  generic_trap  = Generic, 
			  specific_trap = Spec,
			  time_stamp    = Timestamp, 
			  varbinds      = Varbinds} = Trap, 
		 Addr, Port, State) ->

    ?vtrace("handle_snmp_trap [trappdu] -> entry with"
	    "~n   Addr: ~p"
	    "~n   Port: ~p"
	    "~n   Trap: ~p", [Addr, Port, Trap]),

    Varbinds2 = fix_vbs_BITS(Varbinds), 
    SnmpTrapInfo = {Enteprise, Generic, Spec, Timestamp, Varbinds2},
    do_handle_snmp_trap(SnmpTrapInfo, Addr, Port, State);

handle_snmp_trap(#pdu{error_status = EStatus, 
		      error_index  = EIndex, 
		      varbinds     = Varbinds} = Trap, 
		 Addr, Port, State) ->

    ?vtrace("handle_snmp_trap [pdu] -> entry with"
	    "~n   Addr: ~p"
	    "~n   Port: ~p"
	    "~n   Trap: ~p", [Addr, Port, Trap]),

    Varbinds2 = fix_vbs_BITS(Varbinds), 
    SnmpTrapInfo = {EStatus, EIndex, Varbinds2},
    do_handle_snmp_trap(SnmpTrapInfo, Addr, Port, State);

handle_snmp_trap(CrapTrap, Addr, Port, _State) ->
    error_msg("received crap (snmp) trap from ~w:~w =>"
	      "~p", [Addr, Port, CrapTrap]),
    ok.

do_handle_snmp_trap(SnmpTrapInfo, Addr, Port, State) ->
    case snmpm_config:get_agent_user_info(Addr, Port) of
	{ok, UserId, Target, RegType} ->
	    ?vtrace("handle_snmp_trap -> found user: ~p", [UserId]), 
	    case snmpm_config:user_info(UserId) of
		{ok, Mod, Data} ->
		    handle_trap(UserId, Mod, 
				RegType, Target, Addr, Port, 
				SnmpTrapInfo, Data, State);
		
		Error1 ->
		    %% User no longer exists, unregister agent
		    ?vlog("[trap] failed retreiving user info for "
			  "user ~p: "
			  "~n   ~p", [UserId, Error1]),
		    case snmpm_config:unregister_agent(UserId, Target) of
			ok ->
			    %% Try use the default user
			    case snmpm_config:user_info() of
				{ok, DefUserId, DefMod, DefData} ->
				    handle_agent(DefUserId, DefMod, 
						 Addr, Port, 
						 trap, ignore, 
						 SnmpTrapInfo, DefData, State);
				Error2 ->
				    error_msg("failed retreiving the default "
					      "user info handling report from "
					      "~p <~p,~p>: ~n~w~n~w",
					      [Target, Addr, Port, 
					       Error2, SnmpTrapInfo])
			    end;
			Error3 ->
			    %% Failed unregister agent, 
			    %% now its getting messy...
			    warning_msg("failed unregister agent ~p <~p,~p> "
					"belonging to non-existing "
					"user ~p, handling trap: "
					"~n   Error:     ~w"
					"~n   Trap info: ~w",
					[Target, Addr, Port, UserId, 
					 Error3, SnmpTrapInfo])
		    end
	    end;
	
	Error4 ->
	    %% Unknown agent, pass it on to the default user
	    ?vlog("[trap] failed retreiving user id for agent <~p,~p>: "
		  "~n   ~p", [Addr, Port, Error4]),
	    case snmpm_config:user_info() of
		{ok, DefUserId, DefMod, DefData} ->
		    handle_agent(DefUserId, DefMod, 
				 Addr, Port, 
				 trap, ignore, 
				 SnmpTrapInfo, DefData, State);
		Error5 ->
		    error_msg("failed retreiving "
			      "the default user info handling trap from "
			      "<~p,~p>: ~n~w~n~w",
			      [Addr, Port, Error5, SnmpTrapInfo])
	    end
    end,
    ok.


handle_trap(UserId, Mod, 
	    RegType, Target, Addr, Port, SnmpTrapInfo, Data, State) ->
    ?vtrace("handle_trap -> entry with"
	    "~n   UserId: ~p"
	    "~n   Mod:    ~p", [UserId, Mod]),
    F = fun() ->
		do_handle_trap(UserId, Mod, 
			       RegType, Target, Addr, Port, 
			       SnmpTrapInfo, Data, State)
	end,
    handle_callback(F),
    ok.
    

do_handle_trap(UserId, Mod, 
	       RegType, Target, Addr, Port, SnmpTrapInfo, Data, _State) ->
    ?vdebug("do_handle_trap -> entry with"
	    "~n   UserId: ~p", [UserId]),
    HandleTrap = 
	case RegType of
	    target_name ->
		fun() -> Mod:handle_trap(Target, SnmpTrapInfo, Data) end;
	    addr_port ->
		fun() -> Mod:handle_trap(Addr, Port, SnmpTrapInfo, Data) end
	end,

    case (catch HandleTrap()) of
	{register, UserId2, Config} -> 
	    ?vtrace("do_handle_trap -> register: "
		    "~n   UserId2: ~p"
		    "~n   Config:  ~p", [UserId2, Config]),
	    Target2 = mk_target_name(Addr, Port, Config),
	    Config2 = [{reg_type, target_name}, 
		       {address, Addr}, {port, Port} | Config], 
	    case snmpm_config:register_agent(UserId2, Target2, Config2) of
		ok ->
		    ok;
		{error, Reason} ->
		    error_msg("failed registering agent "
			      "handling trap "
			      "<~p,~p>: ~n~w", 
			      [Addr, Port, Reason]),
		    ok
	    end;
	{register, UserId2, Target2, Config} -> 
	    ?vtrace("do_handle_trap -> register: "
		    "~n   UserId2: ~p"
		    "~n   Target2: ~p"
		    "~n   Config:  ~p", [UserId2, Target2, Config]),
	    %% The only user which would do this is the
	    %% default user
	    Config2 = [{reg_type, target_name} | Config], 
	    case snmpm_config:register_agent(UserId2, Target2, Config2) of
		ok ->
		    reply;
		{error, Reason} ->
		    error_msg("failed registering agent "
			      "handling trap "
			      "~p <~p,~p>: ~n~w", 
			      [Target2, Addr, Port, Reason]),
		    reply
	    end;
	unregister ->
	    ?vtrace("do_handle_trap -> unregister", []),
	    case snmpm_config:unregister_agent(UserId, 
					       Addr, Port) of
		ok ->
		    ok;
		{error, Reason} ->
		    error_msg("failed unregistering agent "
			      "handling trap "
			      "<~p,~p>: ~n~w", 
			      [Addr, Port, Reason]),
		    ok
	    end;	    
	_Ignore ->
	    ?vtrace("do_handle_trap -> ignore", []),
	    ok
    end.


handle_snmp_inform(Ref, 
		   #pdu{error_status = EStatus, 
			error_index  = EIndex, 
			varbinds     = Varbinds} = Pdu, Addr, Port, State) ->
 
    ?vtrace("handle_snmp_inform -> entry with"
	    "~n   Addr: ~p"
	    "~n   Port: ~p"
	    "~n   Pdu:  ~p", [Addr, Port, Pdu]),

    Varbinds2 = fix_vbs_BITS(Varbinds), 
    SnmpInform = {EStatus, EIndex, Varbinds2},
    case snmpm_config:get_agent_user_info(Addr, Port) of
	{ok, UserId, Target, RegType} ->
	    case snmpm_config:user_info(UserId) of
		{ok, Mod, Data} ->
		    ?vdebug("[inform] callback handle_inform with: "
			    "~n   UserId: ~p"
			    "~n   Mod:    ~p", [UserId, Mod]),
		    handle_inform(UserId, Mod, Ref, 
				  RegType, Target, Addr, Port, 
				  SnmpInform, Data, State);
		Error1 ->
		    %% User no longer exists, unregister agent
		    case snmpm_config:unregister_agent(UserId, Target) of
			ok ->
			    %% Try use the default user
			    ?vlog("[inform] failed retreiving user "
				  "info for user ~p:"
				  "~n   ~p", [UserId, Error1]),
			    case snmpm_config:user_info() of
				{ok, DefUserId, DefMod, DefData} ->
				    handle_agent(DefUserId, DefMod, 
						 Addr, Port,
						 inform, Ref, 
						 SnmpInform, DefData, State);
				Error2 ->
				    error_msg("failed retreiving the default "
					      "user info handling inform from "
					      "~p <~p,~p>: ~n~w~n~w",
					      [Target, Addr, Port, 
					       Error2, Pdu])
			    end;
			Error3 ->
			    %% Failed unregister agent, 
			    %% now its getting messy...
			    warning_msg("failed unregister agent ~p <~p,~p> "
					"~n   belonging to non-existing "
					"user ~p, handling inform: "
					"~n   Error: ~w"
					"~n   Pdu:   ~w",
					[Target, Addr, Port, UserId, 
					 Error3, Pdu])
		    end
	    end;

	Error4 ->
	    %% Unknown agent, pass it on to the default user
	    ?vlog("[inform] failed retreiving user id for agent <~p,~p>: "
		  "~n   ~p", [Addr, Port, Error4]),
	    case snmpm_config:user_info() of
		{ok, DefUserId, DefMod, DefData} ->
		    handle_agent(DefUserId, DefMod, 
				 Addr, Port, 
				 inform, Ref, 
				 SnmpInform, DefData, State);
		Error5 ->
		    error_msg("failed retreiving "
			      "the default user info handling inform from "
			      "<~p,~p>: ~n~w~n~w",
			      [Addr, Port, Error5, Pdu])
	    end
    end,
    ok;

handle_snmp_inform(_Ref, CrapInform, Addr, Port, _State) ->
    error_msg("received crap (snmp) inform from ~w:~w =>"
	      "~p", [Addr, Port, CrapInform]),
    ok.

handle_inform(UserId, Mod, Ref, 
	      RegType, Target, Addr, Port, SnmpInform, Data, State) ->
    ?vtrace("handle_inform -> entry with"
	    "~n   UserId: ~p"
	    "~n   Mod:    ~p", [UserId, Mod]),
    F = fun() ->
		do_handle_inform(UserId, Mod, Ref, 
				 RegType, Target, Addr, Port, SnmpInform, 
				 Data, State)
	end,
    handle_callback(F),
    ok.

do_handle_inform(UserId, Mod, Ref, 
		 RegType, Target, Addr, Port, SnmpInform, Data, State) ->
    ?vdebug("do_handle_inform -> entry with"
	    "~n   UserId: ~p", [UserId]),
    HandleInform = 
	case RegType of
	    target_name ->
		fun() -> Mod:handle_inform(Target, SnmpInform, Data) end;
	    addr_port ->
		fun() -> Mod:handle_inform(Addr, Port, SnmpInform, Data) end
	end,

     Rep = 
	case (catch HandleInform()) of
	    {register, UserId2, Config} -> 
		?vtrace("do_handle_inform -> register: "
			"~n   UserId2: ~p"
			"~n   Config:  ~p", [UserId2, Config]),
		%% The only user which would do this is the
		%% default user
		Target2 = mk_target_name(Addr, Port, Config),
		Config2 = [{reg_type, target_name}, 
			   {address, Addr}, {port, Port} | Config], 
		case snmpm_config:register_agent(UserId2, Target2, Config2) of
		    ok ->
			reply;
		    {error, Reason} ->
			error_msg("failed registering agent "
				  "handling inform "
				  "~p <~p,~p>: ~n~w", 
				  [Target2, Addr, Port, Reason]),
			reply
		end;
	    {register, UserId2, Target2, Config} -> 
		?vtrace("do_handle_inform -> register: "
			"~n   UserId2: ~p"
			"~n   Target2: ~p"
			"~n   Config:  ~p", [UserId2, Target2, Config]),
		%% The only user which would do this is the
		%% default user
		Config2 = [{reg_type, target_name} | Config], 
		case snmpm_config:register_agent(UserId2, Target2, Config2) of
		    ok ->
			reply;
		    {error, Reason} ->
			error_msg("failed registering agent "
				  "handling inform "
				  "~p <~p,~p>: ~n~w", 
				  [Target2, Addr, Port, Reason]),
			reply
		end;
	    unregister ->
		?vtrace("do_handle_inform -> unregister", []),
		case snmpm_config:unregister_agent(UserId, 
						   Addr, Port) of
		    ok ->
			reply;
		    {error, Reason} ->
			error_msg("failed unregistering agent "
				  "handling inform "
				  "<~p,~p>: ~n~w", 
				  [Addr, Port, Reason]),
			reply
		end;	    
	    no_reply ->
		?vtrace("do_handle_inform -> no_reply", []),
		no_reply;
	    _Ignore ->
		?vtrace("do_handle_inform -> ignore", []),
		reply
	end,
    handle_inform_response(Rep, Ref, Addr, Port, State),
    ok.


handle_inform_response(_, ignore, _Addr, _Port, _State) ->
    ignore;
handle_inform_response(no_reply, _Ref, _Addr, _Port, _State) ->
    no_reply;
handle_inform_response(_, Ref, Addr, Port, 
		       #state{net_if = Pid, net_if_mod = Mod}) ->
    ?vdebug("handle_inform -> response", []),
    (catch Mod:inform_response(Pid, Ref, Addr, Port)).
    
handle_snmp_report(#pdu{error_status = EStatus, 
			error_index  = EIndex, 
			varbinds     = Varbinds} = Pdu, Addr, Port, State) ->

    ?vtrace("handle_snmp_report -> entry with"
	    "~n   Addr: ~p"
	    "~n   Port: ~p"
	    "~n   Pdu:  ~p", [Addr, Port, Pdu]),

    Varbinds2  = fix_vbs_BITS(Varbinds), 
    SnmpReport = {EStatus, EIndex, Varbinds2},
    case snmpm_config:get_agent_user_info(Addr, Port) of
 	{ok, UserId, Target, RegType} ->
 	    case snmpm_config:user_info(UserId) of
 		{ok, Mod, Data} ->
 		    ?vdebug("[report] callback handle_report with: "
 			    "~n   ~p"
 			    "~n   ~p"
 			    "~n   ~p"
 			    "~n   ~p", [UserId, Mod, Target, SnmpReport]),
 		    handle_report(UserId, Mod, 
				  RegType, Target, Addr, Port, 
				  SnmpReport, Data, State);
 		Error1 ->
		    %% User no longer exists, unregister agent
		    ?vlog("[report] failed retreiving user info "
			  "for user ~p:"
			  " ~n   ~p", [UserId, Error1]),
		    case snmpm_config:unregister_agent(UserId, Target) of
			ok ->
			    %% Try use the default user
			    case snmpm_config:user_info() of
				{ok, DefUserId, DefMod, DefData} ->
				    handle_agent(DefUserId, DefMod, 
						 Addr, Port, 
						 report, ignore, 
						 SnmpReport, DefData, State);
				
				Error2 ->
				    error_msg("failed retreiving the default "
					      "user info handling report from "
					      "~p <~p,~p>: ~n~w~n~w",
					      [Target, Addr, Port, 
					       Error2, Pdu])
			    end;
			Error3 ->
			    %% Failed unregister agent, 
			    %% now its getting messy...
			    warning_msg("failed unregister agent ~p <~p,~p> "
					"belonging to non-existing "
					"user ~p, handling report: "
					"~n   Error:  ~w"
					"~n   Report: ~w",
					[Target, Addr, Port, UserId, 
					 Error3, Pdu])
		    end
	    end;
		
	Error4 ->
	    %% Unknown agent, pass it on to the default user
	    ?vlog("[report] failed retreiving user id for agent <~p,~p>: "
		  "~n   ~p", [Addr, Port, Error4]),
	    case snmpm_config:user_info() of
		{ok, DefUserId, DefMod, DefData} ->
		    handle_agent(DefUserId, DefMod, 
				 Addr, Port, 
				 report, ignore, 
				 SnmpReport, DefData, State);
		Error5 ->
		    error_msg("failed retreiving "
			      "the default user info handling report from "
			      "<~p,~p>: ~n~w~n~w",
			      [Addr, Port, Error5, Pdu])
	    end
    end,
    ok;

handle_snmp_report(CrapReport, Addr, Port, _State) ->
    error_msg("received crap (snmp) report from ~w:~w =>"
	      "~p", [Addr, Port, CrapReport]),
    ok.

%% This could be from a failed get-request, so we might have a user
%% waiting for a reply here. If there is, we handle this as an failed
%% get-response (except for tha data which is different). Otherwise,
%% we handle it as an error (reported via the handle_error callback
%% function).
handle_snmp_report(ReqId, 
		   #pdu{error_status = EStatus, 
			error_index  = EIndex, 
			varbinds     = Varbinds} = Pdu, 
		   {ReportReason, Info} = Rep, 
		   Addr, Port, State) 
  when is_integer(ReqId) ->

    ?vtrace("handle_snmp_report -> entry with"
	    "~n   Addr:   ~p"
	    "~n   Port:   ~p"
	    "~n   ReqId:  ~p"
	    "~n   Rep:    ~p"
	    "~n   Pdu:    ~p", [Addr, Port, ReqId, Rep, Pdu]),

    Varbinds2 = fix_vbs_BITS(Varbinds), 
    SnmpReport = {EStatus, EIndex, Varbinds2},
    Reason     = {ReportReason, Info, SnmpReport},
    
    %% Check if there is someone waiting for this request

    case ets:lookup(snmpm_request_table, ReqId) of

	[#request{from     = From, 
		  ref      = Ref, 
		  mon      = MonRef}] when (From =/= undefined) andalso 
					   (Ref  =/= undefined) ->

	    ?vdebug("handle_snmp_report -> "
		    "found corresponding request: "
		    "~n   reply to sync request"
		    "~n   Ref:    ~p"
		    "~n   ModRef: ~p"
		    "~n   From:   ~p", [Ref, MonRef, From]),

	    Remaining = 
		case (catch cancel_timer(Ref)) of
		    Rem when is_integer(Rem) ->
			Rem;
		    _ ->
			0
		end,

	    ?vtrace("handle_snmp_pdu(get-response) -> Remaining: ~p", 
		    [Remaining]),

	    maybe_demonitor(MonRef),

	    Reply = {error, Reason},
	    ?vtrace("handle_snmp_report -> deliver reply",[]), 
	    gen_server:reply(From, Reply),
	    ets:delete(snmpm_request_table, ReqId),
	    ok;
	
	_ ->
	    %% Either not a sync request or no such request. Either
	    %% way, this is error info, so handle it as such.

	    case snmpm_config:get_agent_user_id(Addr, Port) of
		{ok, UserId} ->
		    case snmpm_config:user_info(UserId) of
			{ok, Mod, Data} ->
			    ?vdebug("[report] callback handle_error with: "
				    "~n   ~p"
				    "~n   ~p"
				    "~n   ~p", [UserId, Mod, Reason]),
			    handle_error(UserId, Mod, Reason, ReqId, 
					 Data, State);
			Error ->
			    %% Oh crap, use the default user
			    ?vlog("[report] failed retreiving user info for "
				  "user ~p:"
				  " ~n   ~p", [UserId, Error]),
			    case snmpm_config:user_info() of
				{ok, DefUserId, DefMod, DefData} ->
				    handle_error(DefUserId, DefMod, Reason, 
						 ReqId, DefData, State);
				Error ->
				    error_msg("failed retreiving the "
					      "default user "
					      "info handling report from "
					      "<~p,~p>: ~n~w~n~w~n~w",
					      [Addr, Port, Error, 
					       ReqId, Reason])
			    end
		    end;
		Error ->
		    %% Unknown agent, pass it on to the default user
		    ?vlog("[report] failed retreiving user id for "
			  "agent <~p,~p>: "
			  "~n   ~p", [Addr, Port, Error]),
		    case snmpm_config:user_info() of
			{ok, DefUserId, DefMod, DefData} ->
			    handle_error(DefUserId, DefMod, Reason, ReqId, 
					 DefData, State);
			Error ->
			    error_msg("failed retreiving "
				      "the default user info handling "
				      "report from "
				      "<~p,~p>: ~n~w~n~w~n~w",
				      [Addr, Port, Error, ReqId, Reason])
		    end
	    end
    end,
    ok;

handle_snmp_report(CrapReqId, CrapReport, CrapInfo, Addr, Port, _State) ->
    error_msg("received crap (snmp) report from ~w:~w =>"
	      "~n~p~n~p~n~p", [Addr, Port, CrapReqId, CrapReport, CrapInfo]),
    ok.
   

handle_report(UserId, Mod, RegType, Target, Addr, Port, 
	      SnmpReport, Data, State) ->
    ?vtrace("handle_report -> entry with"
	    "~n   UserId: ~p"
	    "~n   Mod:    ~p", [UserId, Mod]),
    F = fun() ->
		do_handle_report(UserId, Mod, RegType, Target, Addr, Port, 
				 SnmpReport, Data, State)
	end,
    handle_callback(F),
    ok.

do_handle_report(UserId, Mod, 
		 RegType, Target, Addr, Port, SnmpReport, Data, _State) ->
    ?vdebug("do_handle_report -> entry with"
	    "~n   UserId: ~p", [UserId]),
    HandleReport = 
	case RegType of
	    target_name ->
		fun() -> Mod:handle_report(Target, SnmpReport, Data) end;
	    addr_port ->
		fun() -> Mod:handle_report(Addr, Port, SnmpReport, Data) end
	end,

    case (catch HandleReport()) of
	{register, UserId2, Config} -> 
	    ?vtrace("do_handle_report -> register: "
		    "~n   UserId2: ~p"
		    "~n   Config:  ~p", [UserId2, Config]),
	    %% The only user which would do this is the
	    %% default user
	    Target2 = mk_target_name(Addr, Port, Config),
	    Config2 = [{reg_type, target_name}, 
		       {address, Addr}, {port, Port} | Config], 
	    case snmpm_config:register_agent(UserId2, Target2, Config2) of
		ok ->
		    ok;
		{error, Reason} ->
		    error_msg("failed registering agent "
			      "handling report "
			      "<~p,~p>: ~n~w", 
			      [Addr, Port, Reason]),
		    ok
	    end;
	{register, UserId2, Target2, Config} -> 
	    ?vtrace("do_handle_report -> register: "
		    "~n   UserId2: ~p"
		    "~n   Target2: ~p"
		    "~n   Config:  ~p", [UserId2, Target2, Config]),
	    %% The only user which would do this is the
	    %% default user
	    Config2 = [{reg_type, target_name} | Config], 
	    case snmpm_config:register_agent(UserId2, Target2, Config2) of
		ok ->
		    reply;
		{error, Reason} ->
		    error_msg("failed registering agent "
			      "handling report "
			      "~p <~p,~p>: ~n~w", 
			      [Target2, Addr, Port, Reason]),
		    reply
	    end;
	unregister ->
	    ?vtrace("do_handle_trap -> unregister", []),
	    case snmpm_config:unregister_agent(UserId, 
					       Addr, Port) of
		ok ->
		    ok;
		{error, Reason} ->
		    error_msg("failed unregistering agent "
			      "handling report "
			      "<~p,~p>: ~n~w", 
			      [Addr, Port, Reason]),
		    ok
	    end;	    
	_Ignore ->
	    ?vtrace("do_handle_report -> ignore", []),
	    ok
    end.


handle_callback(F) ->
    V = get(verbosity),
    erlang:spawn(
      fun() -> 
	      put(sname, msew), 
	      put(verbosity, V), 
	      F() 
      end).

    
handle_down(MonRef) ->
    (catch do_handle_down(MonRef)).

do_handle_down(MonRef) ->
    %% Clear out all requests from this client
    handle_down_requests_cleanup(MonRef),

    %% 
    %% Check also if this was a monitored user, and if so
    %% unregister all agents registered by this user, and
    %% finally unregister the user itself
    %% 
    handle_down_user_cleanup(MonRef),
    
    ok.


handle_down_requests_cleanup(MonRef) ->
    Pat = #request{id = '$1', ref = '$2', mon = MonRef, _ = '_'},
    Match = ets:match(snmpm_request_table, Pat),
    Fun = fun([Id, Ref]) -> 
		  ?vtrace("delete request: ~p", [Id]),
		  ets:delete(snmpm_request_table, Id),
		  cancel_timer(Ref),
		  ok
	  end,
    lists:foreach(Fun, Match).

handle_down_user_cleanup(MonRef) ->
    Pat = #monitor{id = '$1', mon = MonRef, _ = '_'},
    Match = ets:match(snmpm_monitor_table, Pat),
    Fun = fun([Id]) -> 
		  Agents = snmpm_config:which_agents(Id),
		  lists:foreach(
		    fun({Addr,Port}) -> 
			    %% ** Previous format **
			    %% Just in case this happens during code upgrade
			    ?vtrace("unregister agent of monitored user "
				    "~w: <~w,~w>", [Id,Addr,Port]),
			    snmpm_config:unregister_agent(Id, Addr, Port);
		       (TargetName) ->
			    ?vtrace("unregister agent of monitored user "
				    "~w: ~p", [Id,TargetName]),
			    snmpm_config:unregister_agent(Id, TargetName)
		    end,
		    Agents),
		  ?vtrace("unregister monitored user: ~w", [Id]),
		  ets:delete(snmpm_monitor_table, Id),
		  snmpm_config:unregister_user(Id),
		  ok
	     end,
    lists:foreach(Fun, Match).
    
cancel_timer(undefined) ->
    ok;
cancel_timer(Ref) ->
    (catch erlang:cancel_timer(Ref)).

handle_gc(GCT) ->
    ets:safe_fixtable(snmpm_request_table, true),
    case do_gc(ets:first(snmpm_request_table), t()) of
	0 ->
	    gct_deactivate(GCT);
	_ ->
	    ok
    end,
    ets:safe_fixtable(snmpm_request_table, false).



%% We are deleting at the same time as we are traversing the table!!!
do_gc('$end_of_table', _) ->
    ets:info(snmpm_request_table, size);
do_gc(Key, Now) ->
    Next = ets:next(snmpm_request_table, Key),
    case ets:lookup(snmpm_request_table, Key) of
	[#request{expire = BestBefore}] when (BestBefore < Now) ->
	    ets:delete(snmpm_request_table, Key);
	_ ->
	    ok
    end,
    do_gc(Next, Now).
	    


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

send_get_request(Oids, Vsn, MsgData, Domain, Addr, Port, ExtraInfo, 
		 #state{net_if     = NetIf, 
			net_if_mod = Mod,
			mini_mib   = MiniMIB}) ->
    Pdu = make_pdu(get, Oids, MiniMIB),
    ?vtrace("send_get_request -> send get-request:"
	    "~n   Mod:     ~p"
	    "~n   NetIf:   ~p"
	    "~n   Pdu:     ~p"
	    "~n   Vsn:     ~p"
	    "~n   MsgData: ~p"
	    "~n   Domain:  ~p"
	    "~n   Addr:    ~p"
	    "~n   Port:    ~p", 
	    [Mod, NetIf, Pdu, Vsn, MsgData, Domain, Addr, Port]),
    Res = (catch Mod:send_pdu(NetIf, Pdu, Vsn, MsgData, 
			      Domain, Addr, Port, ExtraInfo)),
    ?vtrace("send_get_request -> send result:"
	    "~n   ~p", [Res]),
    Pdu#pdu.request_id.

send_get_next_request(Oids, Vsn, MsgData, Domain, Addr, Port, ExtraInfo, 
		      #state{mini_mib   = MiniMIB, 
			     net_if     = NetIf, 
			     net_if_mod = Mod}) ->
    Pdu = make_pdu(get_next, Oids, MiniMIB),
    Mod:send_pdu(NetIf, Pdu, Vsn, MsgData, Domain, Addr, Port, ExtraInfo),
    Pdu#pdu.request_id.

send_get_bulk_request(Oids, Vsn, MsgData, Domain, Addr, Port, 
		      NonRep, MaxRep, ExtraInfo, 
		      #state{mini_mib   = MiniMIB, 
			     net_if     = NetIf, 
			     net_if_mod = Mod}) ->
    Pdu = make_pdu(bulk, {NonRep, MaxRep, Oids}, MiniMIB),
    Mod:send_pdu(NetIf, Pdu, Vsn, MsgData, Domain, Addr, Port, ExtraInfo),
    Pdu#pdu.request_id.

send_set_request(VarsAndVals, Vsn, MsgData, Domain, Addr, Port, ExtraInfo, 
		 #state{mini_mib   = MiniMIB,
			net_if     = NetIf, 
			net_if_mod = Mod}) ->
    Pdu = make_pdu(set, VarsAndVals, MiniMIB),
    Mod:send_pdu(NetIf, Pdu, Vsn, MsgData, Domain, Addr, Port, ExtraInfo),
    Pdu#pdu.request_id.

%% send_discovery(Vsn, MsgData, Addr, Port, ExtraInfo, 
%% 	       #state{net_if     = NetIf, 
%% 		      net_if_mod = Mod}) ->
%%     Pdu = make_discovery_pdu(),
%%     Mod:send_pdu(NetIf, Pdu, Vsn, MsgData, Addr, Port, ExtraInfo),
%%     Pdu#pdu.request_id.
							  


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

%% make_discovery_pdu() ->
%%     Oids = [?sysObjectID_instance, ?sysDescr_instance, ?sysUpTime_instance],
%%     make_pdu_impl(get, Oids).

make_pdu(set, VarsAndVals, MiniMIB) ->
    VBs = [var_and_value_to_varbind(VAV, MiniMIB) || VAV <- VarsAndVals],
    make_pdu_impl(set, VBs);

make_pdu(bulk, {NonRepeaters, MaxRepetitions, Oids}, MiniMIB) ->
    Foids = [flatten_oid(Oid, MiniMIB) || Oid <- Oids],
    #pdu{type         = 'get-bulk-request', 
	 request_id   = request_id(),
	 error_status = NonRepeaters, 
	 error_index  = MaxRepetitions,
	 varbinds     = [make_vb(Foid) || Foid <- Foids]};

make_pdu(Op, Oids, MiniMIB) ->
    Foids = [flatten_oid(Oid, MiniMIB) || Oid <- Oids],
    make_pdu_impl(Op, Foids).


make_pdu_impl(get, Oids) ->
    #pdu{type         = 'get-request',
	 request_id   = request_id(),
	 error_status = noError, 
	 error_index  = 0,
	 varbinds     = [make_vb(Oid) || Oid <- Oids]};

make_pdu_impl(get_next, Oids) ->
    #pdu{type         = 'get-next-request', 
	 request_id   = request_id(), 
	 error_status = noError, 
	 error_index  = 0,
	 varbinds     = [make_vb(Oid) || Oid <- Oids]};

make_pdu_impl(set, Varbinds) ->
    #pdu{type         = 'set-request', 
	 request_id   = request_id(),
	 error_status = noError, 
	 error_index  = 0, 
	 varbinds     = Varbinds}.


fix_vbs_BITS(Varbinds) ->
    [fix_vb_BITS(Varbind) || Varbind <- Varbinds].

fix_vb_BITS(#varbind{oid          = Oid,
		     variabletype = 'OCTET STRING' = _Type,
		     value        = Value} = Varbind) ->
    %% BITS are encoded as OCTET STRING, so this could be a BITS
    %% check with the MiniMIB
    case type_of_oid(Oid) of
	{error, _} ->
	    Varbind;
	{ok, NewType = 'BITS'} ->
	    NewValue = snmp_pdus:octet_str_to_bits(Value),
	    Varbind#varbind{variabletype = NewType,
			    value        = NewValue};
	_ ->
	    Varbind
    end;
fix_vb_BITS(Vb) ->
    Vb.

type_of_oid(Oid) ->
    Oid2 = case lists:reverse(Oid) of
	       [0|T] ->
		   lists:reverse(T);
	       _ ->
		   Oid
	   end,
    snmpm_config:oid_to_type(Oid2).


%%----------------------------------------------------------------------
%% Purpose: Unnesting of oids like [myTable, 3, 4, "hej", 45] to
%%          [1,2,3,3,4,104,101,106,45]
%%----------------------------------------------------------------------

flatten_oid([A|T], MiniMIB) when is_atom(A) ->
    Oid = [alias2oid(A, MiniMIB)|T],
    check_is_pure_oid(lists:flatten(Oid));
flatten_oid(Oid, _) when is_list(Oid) ->
    check_is_pure_oid(lists:flatten(Oid));
flatten_oid(Shit, _) ->
    throw({error, {invalid_oid, Shit}}).
	       
check_is_pure_oid([]) -> [];
check_is_pure_oid([X | T]) when is_integer(X) andalso (X >= 0) ->
    [X | check_is_pure_oid(T)];
check_is_pure_oid([X | _T]) ->
    throw({error, {invalid_oid, X}}).


var_and_value_to_varbind({Oid, Type, Value}, MiniMIB) ->
    Oid2 = flatten_oid(Oid, MiniMIB), 
    #varbind{oid          = Oid2, 
	     variabletype = char_to_type(Type), 
	     value        = Value};
var_and_value_to_varbind({Oid, Value}, MiniMIB) ->
    Oid2 = flatten_oid(Oid, MiniMIB), 
    #varbind{oid          = Oid2, 
	     variabletype = oid2type(Oid2, MiniMIB),
	     value        = Value}.

char_to_type(i) ->
    'INTEGER';
char_to_type(u) ->
    'Unsigned32';
char_to_type(g) -> % Gauge, Gauge32
    'Unsigned32';
char_to_type(b) -> 
    'BITS';
char_to_type(ip) -> 
    'IpAddress';
char_to_type(ia) -> 
    'IpAddress';
char_to_type(op) -> 
    'Opaque';
char_to_type(c32) -> 
    'Counter32';
char_to_type(c64) -> 
    'Counter64';
char_to_type(tt) -> 
    'TimeTicks';
char_to_type(o) ->
    'OBJECT IDENTIFIER';
char_to_type(s) ->
    'OCTET STRING';
char_to_type(C) ->
    throw({error, {invalid_value_type, C}}).


alias2oid(AliasName, MiniMIB) when is_atom(AliasName) ->
    case lists:keysearch(AliasName, 2, MiniMIB) of
	{value, {Oid, _Aliasname, _Type}} -> 
 	    Oid;
	false -> 
 	    throw({error, {unknown_aliasname, AliasName}})
    end.

oid2type(Oid, MiniMIB) ->
    Oid2 = case lists:reverse(Oid) of
	       [0|T] ->
		   lists:reverse(T);
	       _ ->
		   Oid
	   end,
    oid2type(Oid2, MiniMIB, utter_nonsense).

oid2type(_Oid, [], utter_nonsense) ->
    throw({error, no_type});
oid2type(_Oid, [], Type) ->
    Type;
oid2type(Oid, [{Oid2, _, Type}|MiniMIB], Res) when (Oid2 =< Oid) ->
    case lists:prefix(Oid2, Oid) of
        true ->
            oid2type(Oid, MiniMIB, Type); % A better guess
        false ->
            oid2type(Oid, MiniMIB, Res)
    end;
oid2type(_Oid, _MiniMIB, utter_nonsense) ->
    throw({error, no_type});
oid2type(_Oid, _MiniMIB, Type) ->
    Type.
    

make_vb(Oid) ->
    #varbind{oid = Oid, variabletype = 'NULL', value = 'NULL'}.


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

request_id() ->
    snmpm_mpd:next_req_id().


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

agent_data(TargetName, SendOpts) ->
    case snmpm_config:agent_info(TargetName, all) of
	{ok, Info} ->
	    Version = agent_data_item(version, Info), 
	    MsgData = 
		case Version of
		    v3 ->
			DefSecModel = agent_data_item(sec_model, Info),
			DefSecName  = agent_data_item(sec_name,  Info),
			DefSecLevel = agent_data_item(sec_level, Info),
			
			EngineId    = agent_data_item(engine_id, Info),
			CtxName     = agent_data_item(context, 
						      SendOpts, 
						      ?DEFAULT_CONTEXT),
			
			SecModel    = agent_data_item(sec_model,   
						      SendOpts, 
						      DefSecModel),
			SecName     = agent_data_item(sec_name,    
						      SendOpts, 
						      DefSecName),
			SecLevel    = agent_data_item(sec_level,   
						      SendOpts, 
						      DefSecLevel),
			
			{SecModel, SecName, mk_sec_level_flag(SecLevel), 
			 EngineId, CtxName, TargetName};
		    _ ->
			DefComm     = agent_data_item(community, Info),
			DefSecModel = agent_data_item(sec_model, Info),
			
			Comm        = agent_data_item(community, 
						      SendOpts, 
						      DefComm),
			SecModel    = agent_data_item(sec_model, 
						      SendOpts, 
						      DefSecModel),
			
			{Comm, SecModel}
		end,
	    Domain  = agent_data_item(domain,   Info),
	    Addr    = agent_data_item(address,  Info),
	    Port    = agent_data_item(port,     Info),
	    RegType = agent_data_item(reg_type, Info),
	    {ok, RegType, Domain, Addr, Port, version(Version), MsgData};
	Error ->
	    Error
    end.

agent_data_item(Item, Info) ->
    case lists:keysearch(Item, 1, Info) of
	{value, {_, Val}} ->
	    Val;
	false ->
	    throw({error, {not_found, Item, Info}})
    end.

agent_data_item(Item, Info, Default) ->
    case lists:keysearch(Item, 1, Info) of
	{value, {_, Val}} ->
	    Val;
	false ->
	    Default
    end.


version(v1) ->
    'version-1';
version(v2) ->
    'version-2';
version(v3) ->
    'version-3'.


%%-----------------------------------------------------------------
%% Convert the SecurityLevel into a flag value used by snmpm_mpd
%%-----------------------------------------------------------------
mk_sec_level_flag(?'SnmpSecurityLevel_noAuthNoPriv') -> 0;
mk_sec_level_flag(?'SnmpSecurityLevel_authNoPriv') -> 1;
mk_sec_level_flag(?'SnmpSecurityLevel_authPriv') -> 3.


%%----------------------------------------------------------------------
%% Request Garbage Collector timer
%%----------------------------------------------------------------------

gct_start(Timeout) ->
    ?vdebug("start gc timer process (~p)", [Timeout]),    
    State = #gct{parent = self(), timeout = Timeout},
    proc_lib:start_link(?MODULE, gct_init, [State]).

gct_stop(GCT) ->
    GCT ! {stop, self()}.

gct_activate(GCT) ->
    GCT ! {activate, self()}.

gct_deactivate(GCT) ->
    GCT ! {deactivate, self()}.

gct_code_change(GCT) ->
    GCT ! {code_change, self()}.

gct_init(#gct{parent = Parent, timeout = Timeout} = State) ->
    proc_lib:init_ack(Parent, {ok, self()}),
    gct(State, Timeout).

gct(#gct{parent = Parent, state = active} = State, Timeout) ->
    T = t(),
    receive
	{stop, Parent} ->
	    ok;

	%% This happens when a new request is received.
	{activate, Parent}  ->
	    ?MODULE:gct(State, new_timeout(Timeout, T)); 

	{deactivate, Parent} ->
	    %% Timeout is of no consequence in the idle state, 
	    %% but just to be sure
	    NewTimeout = State#gct.timeout,
	    ?MODULE:gct(State#gct{state = idle}, NewTimeout);

	{code_change, Parent} ->
	    %% Let the server take care of this
	    exit(normal);

	{'EXIT', Parent, _Reason} ->
	    ok;

	_ -> % Crap
	    ?MODULE:gct(State, Timeout)

    after Timeout ->
	    Parent ! gc_timeout,
	    NewTimeout = State#gct.timeout,
	    ?MODULE:gct(State, NewTimeout)
    end;

gct(#gct{parent = Parent, state = idle} = State, Timeout) ->
    receive
	{stop, Parent} ->
	    ok;

	{deactivate, Parent} ->
	    ?MODULE:gct(State, Timeout);

	{activate, Parent} ->
	    NewTimeout = State#gct.timeout,
	    ?MODULE:gct(State#gct{state = active}, NewTimeout);

	{code_change, Parent} ->
	    %% Let the server take care of this
	    exit(normal);

	{'EXIT', Parent, _Reason} ->
	    ok;

	_ -> % Crap
	    ?MODULE:gct(State, Timeout)

    after Timeout ->
	    ?MODULE:gct(State, Timeout)
    end.

new_timeout(T1, T2) ->
    case T1 - (t() - T2) of
	T when (T > 0) ->
	    T;
	_ ->
	    0
    end.


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

maybe_delete(false, ReqId) ->
    ets:delete(snmpm_request_table, ReqId);
maybe_delete(true, _) ->
    ok.
    
maybe_demonitor(undefined) ->
    ok;
maybe_demonitor(MonRef) ->
    erlang:demonitor(MonRef).

%% Time in milli seconds
t() ->
    {A,B,C} = erlang:now(),
    A*1000000000+B*1000+(C div 1000).
    
mk_target_name(Addr, Port, Config) ->
    snmpm_config:mk_target_name(Addr, Port, Config).

default_agent_config() ->
    case snmpm_config:agent_info() of
	{ok, Config} ->
	    Config;
	_ ->
	    []
    end.


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

get_opt(Key, Default, Opts) ->
    proplists:get_value(Key, Opts, Default).


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

is_started(#state{net_if = _Pid, net_if_mod = _Mod}) ->
    %% Mod:is_started(Pid) and snmpm_config:is_started().
    case snmpm_config:is_started() of
	true ->
	    true;
	_ ->
	    false
    end.


%%----------------------------------------------------------------------
	
call(Req) ->
    call(Req, infinity).

call(Req, To) ->
    gen_server:call(?SERVER, Req, To).

%% cast(Msg) ->
%%     gen_server:cast(?SERVER, Msg).

%% info_msg(F, A) ->
%%     ?snmpm_info("Server: " ++ F, A).

warning_msg(F, A) ->
    ?snmpm_warning("Server: " ++ F, A).

error_msg(F, A) ->
    ?snmpm_error("Server: " ++ F, A).
 

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

get_info(#state{gct = GCT, 
		net_if = NI, net_if_mod = NIMod, 
		note_store = NS}) ->
    Info = [{server,         server_info(GCT)},
	    {config,         config_info()},
	    {net_if,         net_if_info(NI, NIMod)},
	    {note_store,     note_store_info(NS)},
	    {stats_counters, get_stats_counters()}],
    Info.

server_info(GCT) ->
    ProcSize = proc_mem(self()),
    GCTSz    = proc_mem(GCT),
    RTSz     = tab_size(snmpm_request_table),
    MTSz     = tab_size(snmpm_monitor_table),
    [{process_memory, [{server, ProcSize}, {gct, GCTSz}]},
     {db_memory, [{request, RTSz}, {monitor, MTSz}]}].

proc_mem(P) when is_pid(P) ->
    case (catch erlang:process_info(P, memory)) of
	{memory, Sz} when is_integer(Sz) ->
	    Sz;
	_ ->
	    undefined
    end;
proc_mem(_) ->
    undefined.

tab_size(T) ->
    case (catch ets:info(T, memory)) of
	Sz when is_integer(Sz) ->
	    Sz;
	_ ->
	    undefined
    end.

config_info() ->
    case (catch snmpm_config:info()) of
	Info when is_list(Info) ->
	    Info;
	E ->
	    [{error, E}]
    end.

get_stats_counters() ->
    lists:sort(snmpm_config:get_stats_counters()).
    

net_if_info(Pid, Mod) ->
    case (catch Mod:info(Pid)) of
	Info when is_list(Info) ->
	    Info;
	E ->
	    [{error, E}]
    end.

note_store_info(Pid) ->
    case (catch snmp_note_store:info(Pid)) of
	Info when is_list(Info) ->
	    Info;
	E ->
	    [{error, E}]
    end.


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


%%----------------------------------------------------------------------
%% Debug
%%----------------------------------------------------------------------

% sz(L) when is_list(L) ->
%     length(lists:flatten(L));
% sz(B) when is_binary(B) ->
%     size(B).

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

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