For the benefit of all :
- I was using the "mfd" method to generate the template "C" code
- I was using the dlmod method to extend the agent.
- The problem was with my make file I had used to build the shared object.
- I had missed the step of running net-snmp-config --cflags and --ldflags
- Run net-snmp-config ( You can pass a number of flags ) to obtain a lot of
build related information for building your shared object.
- Add the results of net-snmp-config --cflags --ldflags to your make file's
cflags and ldflags options
- This results in a correctly built shared object
- MORAL OF THE STORY : For build related information "NET-SNMP-CONFIG" is
your friend.
- I particularly was hosed because i had missed a compile time "inline
flag" that was needed.
On Wed, Jun 2, 2010 at 10:55 PM, ashwin kumar <ashwin....@gmail.com> wrote:
> Dear Swaroop,
>
> When you do a mib2c compilation over the MIB it will generate two files, .c
> and .h files.
> theres is no much need to modify .h file but the .c files contain 'XXX' the
> places where it is
> required to add the code. if these parts of code are not modified then the
> compilation itself wont be possible. Unreferenced lists would be generated
> unless you modify the code with at least static scalar values.
> check out the net-snmp tutorial section for the failure of dlmod function.
> good luck.
>
> On Wed, Jun 2, 2010 at 7:55 AM, Swaroop Sham <swaroop....@gmail.com>wrote:
>
>> Hi ,
>>
>> I am trying to extend the snmp agent by doing the following
>>
>> - I built a minimal agent by using the configure script ./configure
>> --enable-mini-agent
>> - I compiled "ONLY" the ifTable using mib2c with the following options:
>> - Netsnmp-style-code
>> - Tables where the list of rows is external to the agent.
>> - An API layer that attempts to reduce the amount of SNMP specific
>> knowledge required to implement the module.
>> -* All other table options where set to defaults*
>> - I used the "dlmod" shared object method of trying to extend the agent by
>> placing the shared object name and /path/to/object in the snmpd.conf file
>> - I did not modify any section of the code yet. I want to try and load the
>> shared object as is.
>> - When i try to start the agent , the dlopen fails :
>>
>> could not open /proc/net/if_inet6
>> cache has existing timer id.
>> dlopen failed: /usr/lib/ifTable.so: undefined symbol:
>> netsnmp_container_table_row_extract
>> NET-SNMP version 5.2.3
>>
>> - I did a nm -u on the shared objects and a number of un defined
>> references were listed
>> U malloc@@GLIBC_2.0
>> U memcpy@@GLIBC_2.0
>> U memset@@GLIBC_2.0
>> U netsnmp_baby_steps_access_multiplexer_get
>> U netsnmp_baby_steps_handler_get
>> U netsnmp_cache_create
>> U netsnmp_cache_handler_get
>> U netsnmp_check_requests_error
>> U netsnmp_check_vb_type_and_size
>> U netsnmp_container_find
>> U netsnmp_container_table_handler_get
>> U netsnmp_container_table_row_extract
>> U netsnmp_create_data_list
>> U netsnmp_extract_table_info
>> U netsnmp_get_row_merge_handler
>> U netsnmp_handler_registration_create
>> U netsnmp_inject_handler
>> U netsnmp_register_table
>> U netsnmp_request_set_error
>> U netsnmp_request_set_error_all
>> U netsnmp_set_request_error
>> U netsnmp_table_helper_add_indexes
>>
>> - Could any one help me with this ?
>>
>>
>> thanks
>> Swaroop
>>
>>
>>
>>
>> ------------------------------------------------------------------------------
>>
>>
>> _______________________________________________
>> Net-snmp-users mailing list
>> Net-snmp-users@lists.sourceforge.net
>> Please see the following page to unsubscribe or change other options:
>> https://lists.sourceforge.net/lists/listinfo/net-snmp-users
>>
>>
>
>
> --
> Ashwin.
> 9742738409
>
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