Hello,
I've been experimenting with the caching (netsnmp 5.3.1-14.el5 yeah
RedHat) and I've noticed something that I do not understand. First of
all here are the details:
mod ::= t 1.3.6.1.4.1.1139.16.10 -- top level module OID
sw ::== { modMIB 1 } //SW_OID
swTable ::= { sw 1} // SWTABLE_OID
I'm basically just filling a table of RPM packages in swTable.
Here is my init routine:
55 void init_software(void)
56 {
57 static oid swTable_oid[] = { SWTABLE_OID };
58 static oid sw_oid[] = { SW_OID };
59 netsnmp_table_registration_info *table;
60 netsnmp_handler_registration *handler;
61 netsnmp_iterator_info *iter;
62 int rc = 0;
63
64
65 table =
SNMP_MALLOC_TYPEDEF(netsnmp_table_registration_info);
66 iter = SNMP_MALLOC_TYPEDEF(netsnmp_iterator_info);
67
68 handler = netsnmp_create_handler_registration("swTable",
69
swTable_handler,
70 swTable_oid,
71
OID_LENGTH(swTable_oid),
72
HANDLER_CAN_RONLY);
73 if (!handler || !table || !iter)
74 {
75 snmp_log(LOG_ERR, "malloc failed in init_software");
76 return;
77 }
78
79 netsnmp_table_helper_add_indexes(table, ASN_INTEGER, 0);
80 table->min_column = SWTABLE_MIN_COLUMN;
81 table->max_column = SWTABLE_MAX_COLUMN;
82 iter->get_first_data_point = swTable_get_first_data_point;
83 iter->get_next_data_point = swTable_get_next_data_point;
84 iter->table_reginfo = table;
85 netsnmp_register_table_iterator(handler, iter);
86
87
88 rc =
netsnmp_register_cache_handler(netsnmp_create_handler_registration
89 ("swTableCache", NULL,
90 sw_oid,
OID_LENGTH(sw_oid), 0), // fails if I use swTable_oid
91 SWTABLE_CACHE_TIMEOUT,
92 swTable_load,
swTable_free);
93
94 DEBUGMSGTL(("sdp", "netsnmp_register... = %d\n", rc));
95 }
The code above does work.
What I have noticed is that if I call netsnmp_register_cache_handler
with the OID for the table (swTable_oid) the function returns -1 and the
snmp walk returns nothing. If I use an OID one level up, either sw_oid
(.16.10.1) or mod_oid (.16.10) the routine returns 0 and the snmp walk
works. I don't understand why using the same OID for the two calls
(lines 68, 88) fail. My intent is to build a module which has a number
of caches, each with different tables and load routines, that's why I
cannot use the higher level OIDs so I thought that I can just use the
same OID as the table. Is the cause of the problem due to the two calls
to netsnmp_create_handler_registration for the same OID? I also tried
using the same handler from the first call to
netsnmp_create_handler_registration (line 68) and that also did not
work. Can someone please explain. Thanks.
---
Don Khan
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