Re: unregister_mib fails

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 <[email protected]>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 <[email protected]> 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 <[email protected]>
> >         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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>
>

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