Re: Newly built 5.8 on QNX 7

Hi Ian,

Everything seems to be fine. Not sure why "tabreq" is getting NULL in
netsnmp_get_table_handler.

I have a suggestion. I see the same implementation with slight modification
in init_icmp() function in agent/mibgroup/mibII/icmp.c. There I can see the
table is using a different function "netsnmp_register_table_iterator2" to
register the table. Maybe this function might help you.

I'm not sure whether this will solve the issue. Just a suggestion so that
you can try.

Thanks,
Aferjes Blesswin Redeemson M

On Fri, Aug 7, 2020 at 12:21 AM Ian C via Net-snmp-coders <
[email protected]> wrote:

> I took Wes' advice and ran with -DALL, along with some extra DEBUGMSGTLs
> in suspect areas (-DALL output follows):
> void
> initialize_table_chAsinHwSbcNtpTable(void)
> {
>     syslog( LOG_ERR, "initialize_table_chAsinHwSbcNtpTable()");
>     const oid chAsinHwSbcNtpTable_oid[] = {1,3,6,1,4,1,25228,3,3,1,9,6,6};
>     const size_t chAsinHwSbcNtpTable_oid_len   =
> OID_LENGTH(chAsinHwSbcNtpTable_oid);
>     netsnmp_handler_registration    *reg;
>     netsnmp_iterator_info           *iinfo;
>     netsnmp_table_registration_info *table_info;
>
>     DEBUGMSGTL(("chAsinHwSbcNtpTable", "initializing table
> chAsinHwSbcNtpTable\n"));
>
>     reg = netsnmp_create_handler_registration(
>               "chAsinHwSbcNtpTable",     chAsinHwSbcNtpTable_handler,
>               chAsinHwSbcNtpTable_oid, chAsinHwSbcNtpTable_oid_len,
>               HANDLER_CAN_RONLY
>               );
>
>     table_info = SNMP_MALLOC_TYPEDEF( netsnmp_table_registration_info );
>     if(table_info == NULL) {
>         DEBUGMSGTL(("chAsinHwSbcNtpTable", "after SNMP_MALLOC_TYPEDEF( )
> table_info is _N_U_L_L!\n"));
>     }
>     else {
>         DEBUGMSGTL(("chAsinHwSbcNtpTable", "after SNMP_MALLOC_TYPEDEF( )
> table_info _NOT_ null\n"));
>     }
>     netsnmp_table_helper_add_indexes(table_info,
>                            ASN_OCTET_STR,  /* index: chAsinHwSbcNtpSbcName
> */
>                            0);
>     if(table_info == NULL) {
>         DEBUGMSGTL(("chAsinHwSbcNtpTable", "after
> netsnmp_table_helper_add_indexes( ) table_info is _N_U_L_L!\n"));
>     }
>     else {
>         DEBUGMSGTL(("chAsinHwSbcNtpTable", "after
> netsnmp_table_helper_add_indexes( ) table_info _NOT_ null\n"));
>     }
>     table_info->min_column = COLUMN_CHASINHWSBCNTPSBCNAME;
>     table_info->max_column = COLUMN_CHASINHWSBCNTPSTATUSSTRING;
>
>     iinfo = SNMP_MALLOC_TYPEDEF( netsnmp_iterator_info );
>     iinfo->get_first_data_point = chAsinHwSbcNtpTable_get_first_data_point;
>     iinfo->get_next_data_point  = chAsinHwSbcNtpTable_get_next_data_point;
>     iinfo->table_reginfo        = table_info;
>     iinfo->free_loop_context_at_end = nsModuleTable_loop_free;
>     iinfo->free_data_context = freeTableEntry;
>
>     if(iinfo->table_reginfo == NULL) {
>         DEBUGMSGTL(("chAsinHwSbcNtpTable", "before
> netsnmp_register_table_iterator( ) iinfo->table_reginfo is _N_U_L_L!\n"));
>     }
>     else {
>         DEBUGMSGTL(("chAsinHwSbcNtpTable", "before
> netsnmp_register_table_iterator( ) iinfo->table_reginfo  _NOT_ null\n"));
>     }
>     netsnmp_register_table_iterator( reg, iinfo );
>
>     /* Initialise the contents of the table here */
> }
>
>
> Now a snippet from the -DALL logging, but nothing stands out to me,
> perhaps someone on the list may have some idea:
>
> 9:callback:lock: locked (LIB,POST_READ_CONFIG)
> trace: netsnmp_register_callback(): callback.c, 296:
> callback: registered (0,0) at 806c818 with priority 0
> trace: _callback_unlock(): callback.c, 170:
> 9:callback:lock: unlocked (LIB,POST_READ_CONFIG)
> trace: subagent_init(): mibgroup/agentx/subagent.c, 162:
> agentx/subagent: initializing....  DONE
> trace: internal_register_config_handler(): read_config.c, 219:
> 9:read_config:register_handler: registering ./icSNMPntpSubAgentChA.exe
> com2sec
> trace: internal_register_config_handler(): read_config.c, 219:
> 9:read_config:register_handler: registering ./icSNMPntpSubAgentChA.exe
> com2sec6
> trace: internal_register_config_handler(): read_config.c, 219:
> 9:read_config:register_handler: registering ./icSNMPntpSubAgentChA.exe
> com2secunix
> trace: initialize_table_chAsinHwSbcNtpTable():
> C:/Users/clougia/workspace/SIN_4/SIN_QNX7/seg_src/SNMP/sinHwSbcNTPtable/channelA/chAsinHwSbcNtpTable.cpp,
> 60:
> chAsinHwSbcNtpTable: initializing table chAsinHwSbcNtpTable
> trace: initialize_table_chAsinHwSbcNtpTable():
> C:/Users/clougia/workspace/SIN_4/SIN_QNX7/seg_src/SNMP/sinHwSbcNTPtable/channelA/chAsinHwSbcNtpTable.cpp,
> 73:
> chAsinHwSbcNtpTable: after SNMP_MALLOC_TYPEDEF( ) table_info _NOT_ null
> trace: initialize_table_chAsinHwSbcNtpTable():
> C:/Users/clougia/workspace/SIN_4/SIN_QNX7/seg_src/SNMP/sinHwSbcNTPtable/channelA/chAsinHwSbcNtpTable.cpp,
> 82:
> chAsinHwSbcNtpTable: after netsnmp_table_helper_add_indexes( ) table_info
> _NOT_ null
> trace: initialize_table_chAsinHwSbcNtpTable():
> C:/Users/clougia/workspace/SIN_4/SIN_QNX7/seg_src/SNMP/sinHwSbcNTPtable/channelA/chAsinHwSbcNtpTable.cpp,
> 98:
> chAsinHwSbcNtpTable: before netsnmp_register_table_iterator( )
> iinfo->table_reginfo  _NOT_ null
> trace: netsnmp_inject_handler_before(): agent_handler.c, 444:
> handler:inject: injecting table_iterator before chAsinHwSbcNtpTable
> netsnmp_get_table_handler(NULL) called
> could not create table handler
>
> Thanks again Wes, and everyone else reading this!
>
> Ian
>
>
>
>
> On Thursday, August 6, 2020, 9:56:00 a.m. EDT, Ian C <[email protected]>
> wrote:
>
>
> Thanks Wes, will try this soon.
>
> On Wednesday, August 5, 2020, 1:47:24 p.m. EDT, Wes Hardaker <
> [email protected]> wrote:
>
>
> Ian C via Net-snmp-coders <[email protected]>
>
> writes:
>
> > Hi,
> >
> > We previously had net-snmp 5.6 running on QNX 6.5 (from pkgsrc), and had
> various
> > sub-agents retrieving data and working well. However we've recently
> migrated our OS
> > to QNX 7.0 and since there are no pkgsrc packages available for that OS
> we've
> > upgraded and compiled net-snmp 5.8 ourselves.
> >
> > Most of the system has ported well, GETs for scalars are fine; snmp
> table queries
> > for system OIDs such as ifTable & atTable also work, however any table
> query for our
> > own table-based subagents fail. While digging into this I noticed that
> upon start-up
> > our subagent reports:
> >
> > Qnx7->SubAgentChA.exe -Lo -d
> > netsnmp_get_table_handler(NULL) called
> > could not create table handler
>
>
> I'd run with -DALL in order to get a *lot* of debug output (assuming you
> didn't turn off debugging output).  Specifically, look for the same
> error message to figure out where in the code the problem is triggered
> from in the output trace.  Because this is where the code is:
>
>     netsnmp_mib_handler *
>     netsnmp_get_table_handler(netsnmp_table_registration_info *tabreq)
>     {
>         netsnmp_mib_handler *ret = NULL;
>
>         if (!tabreq) {
>             snmp_log(LOG_INFO, "netsnmp_get_table_handler(NULL) called\n");
>             return NULL;
>         }
>
> Which means that the function is getting called with a NULL input, which
> certainly shouldn't happen.  But *where* is calling it?
>
> -DALL should help identify that
> --
> Wes Hardaker
> Please mail all replies to [email protected]
>
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>

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