The problem I mentioned was noticed even with UCD-DLMOD registration and
unregistration code (agent/mibgroup/ucd-snmp/dlmod.c).
Here is the example code I compiled and was able to reproduce on my Linux
2.6.32 (64bit).
I am using net-snmp-5.7.2.
/*
* example_oid:
*/
oid example_oid[] = { 1,3,6,1,4,1,8076,1,5,2 };
struct variable2 example_variables[] = {
/* magic number , variable type , ro/rw , callback fn , L,
oidsuffix */
#define exampleTableId 1
{exampleTableId, ASN_INTEGER, RONLY, get_exampleTable, 2, { 1,1 }},
#define exampleTableROps 2
{exampleTableROps, ASN_COUNTER, RONLY, get_exampleTable, 2, { 1,2 }},
#define exampleTableWops 3
{exampleTableWops, ASN_COUNTER, RONLY, get_exampleTable, 2, { 1,3 }},
};
void
init_example_table(void)
{
/* register ourselves with the agent to handle our mib tree */
REGISTER_MIB("exampleTable", example_variables, variable2,
example_oid);
}
void deinit_example_table(void) {
int result;
result = unregister_mib(example_oid,
sizeof(example_oid)/sizeof(oid));
if (result != MIB_UNREGISTERED_OK) {
snmp_log(LOG_ERR, "%s: unregistering failed:%d\n", __FUNCTION__,
result);
}
}
On Mon, Mar 18, 2013 at 10:45 PM, Magnus Fromreide <ma...@lysator.liu.se>wrote:
> On Fri, 2013-03-08 at 12:45 -0800, Pal Saint wrote:
> > unregister_mib fails even for standard UCD-DLMOD MIB.
> > While registering all the columns are explicitly registered. But
> > during unregistering, unregister_mib tries to do an exact match with
> > the root oid to the subtree children that were registered. This seems
> > to fail.
> > Checking if unregister_mib_range might help.
> > Could someone comment if you have experience in this area? Thanks
> >
> >
> > On Fri, Mar 8, 2013 at 12:09 PM, Pal Saint <pals...@gmail.com> wrote:
> > I added additional debugging to 'agent_registry.c' file and
> > recompiled. During unregistering the MIB, the agent complaints
> > about not finding the child and
> > returns MIB_NO_SUCH_REGISTRATION.
> >
> >
> > My subagents registers MIB using default context ("") and
> > default priority. Any idea why the registering succeeds but
> > not unregistering MIB? I appreciate your insights and
> > pointers.
>
>
> What is the code you use for unregistration?
> Normally unregistration is done as a mirror of registration, so to
> mirror the registration you got done you need to mirror REGISTER_MIB,
> like this:
>
> /* generated code */
>
> void
> init_foo(void)
> {
> DEBUGMSGTL(("foo", "Initializing\n"));
>
> /* register ourselves with the agent to handle our mib tree */
> REGISTER_MIB("foo", foo_variables, variable4,foo_variables_oid);
>
> /* place any other initialization junk you need here */
> }
>
> /* New code you need to add */
> void
> shutdown_foo(void)
> {
> DEBUGMSGTL(("foo", "Shutting down\n"));
>
> /* unregister ourselves with the agent */
> unregister_mib(foo_variables_oid, OID_LENGTH(foo_variables_oid));
> }
>
> You also failed to say which version of Net-SNMP you are working with.
>
> Also, if reporting things like this then a working minimal example of
> the problem is appreciated - right now I have tried to guess what your
> problem is and I might have guessed wrong.
>
> /MF
> >
> > 1695 while(unregistering){
> > 1696 DEBUGMSGTL(("register_mib", "unregistering "));
> > 1697 DEBUGMSGOIDRANGE(("register_mib", name, len,
> > range_subid, range_ubound));
> > 1698 DEBUGMSG(("register_mib", "\n"));
> > 1699
> > 1700 list = netsnmp_subtree_find(name, len,
> > netsnmp_subtree_find_first(context),
> > 1701 context);
> > 1702 if (list == NULL) {
> > 1703 DEBUGMSGTL(("register_mib", "pal:failed to
> > find subtree"));
> > 1704 return MIB_NO_SUCH_REGISTRATION;
> > 1705 }
> > 1706
> > 1707 for (child = list, prev = NULL; child != NULL;
> > 1708 prev = child, child = child->children) {
> > 1709 if (netsnmp_oid_equals(child->name_a,
> > child->namelen, name, len) == 0 &&
> > 1710 child->priority == priority) {
> > 1711 break; /* found it */
> > 1712 }
> > 1713 }
> > 1714
> > 1715 if (child == NULL) {
> > 1716 DEBUGMSGTL(("register_mib", "pal:failed null
> > child")); <<<<<<<<<<<< Returns from here
> > 1717 return MIB_NO_SUCH_REGISTRATION;
> > 1718 }
> >
> >
> >
> >
> > On Thu, Mar 7, 2013 at 1:22 AM, Pal Saint <pals...@gmail.com>
> > wrote:
> > All,
> >
> >
> > We use REGISTER_MIB() to register our MIB tables, and
> > use unregister_mib() for unregistering them. However,
> > when SIGHUP is sent to snmpd, it fails to unregister
> > the MIB variables. It fails with
> > "MIB_NO_SUCH_REGISTRATION". Registering and
> > unregistering code is actually created by
> > mib2c.old_api code generation configuration. Let me
> > know if you need more information.
> >
> >
> > Here is snmpd debug info...
> >
> >
> > dlmod: dlmod_create_module
> > dlmod: dlmod_load_module
> > exampleTable: /usr/lib/snmp/dlmod/exampleTable.so
> > ................. Registering exampleTable
> > register_mib: registering "exampleTable" at
> > SNMPv2-SMI::enterprises.8075.1.3.2.1.1 with context ""
> > register_mib: registering "exampleTable" at
> > SNMPv2-SMI::enterprises.8075.1.3.2.1.2 with context ""
> > register_mib: registering "exampleTable" at
> > SNMPv2-SMI::enterprises.8075.1.3.2.1.3 with context ""
> > register_mib: registering "exampleTable" at
> > SNMPv2-SMI::enterprises.8075.1.3.2.1.4 with context ""
> > register_mib: registering "exampleTable" at
> > SNMPv2-SMI::enterprises.8075.1.3.2.1.5 with context ""
> > register_mib: registering "exampleTable" at
> > SNMPv2-SMI::enterprises.8075.1.3.2.1.6 with context ""
> > register_mib: registering "exampleTable" at
> > SNMPv2-SMI::enterprises.8075.1.3.2.1.7 with context ""
> >
> >
> > ...
> > dlmod: Calling deinit_exampleTable()
> > deinit_exampleTable: unregistering exampleTable...
> > register_mib: unregistering
> > SNMPv2-SMI::enterprises.8075.1.3.2
> > deinit_exampleTable: unregistering exampleTable
> > failed:-1
> > dlmod: Module exampleTable unloaded
> >
> >
> >
> >
> >
> >
> >
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