Hi,
Our MIB specification contains various tables and scalar entries that were
converted to C code using 'mib2c'.
The C files forming our MIB branch were compiled into a shared object that is
dynamically loaded using dlmod.
However, the initialization of each object in the module runs into NULL pointer
errors:
Module vsatSb2Ut loaded
netsnmp_get_table_handler(NULL) called
netsnmp_inject_handler() called illegally
netsnmp_assert handler != ((void *)0) failed agent_handler.c:418
netsnmp_inject_handler_before()
netsnmp_get_table_handler(NULL) called
netsnmp_inject_handler() called illegally
netsnmp_assert handler != ((void *)0) failed agent_handler.c:418
netsnmp_inject_handler_before()
handlerName = vsatSb2UtMacTablenetsnmp_get_table_handler(NULL) called
..... and so on.
Using gdb, I was able to find out the origin of the NULL pointer.
In any of our initialize_table_xxx() functions that are auto generated by the
mib2c tool, these structures are populated:
netsnmp_handler_registration *reg;
netsnmp_iterator_info *iinfo;
netsnmp_table_registration_info *table_info;
Finally, this libnetsnmp iterator function is called within the initialization
function:
netsnmp_register_table_iterator(reg, iinfo);
Both reg and iinfo are valid memory addresses in both our module and in the
libnetsnmp functions.
However, iinfo->table_reginfo which prints a valid address in our module
becomes address 0x0 as soon as it enters the netsnmp_register_table_iterator()
function.
This is the cause of the NULL pointer errors seen above.
If you have any comments, debug suggestions or more questions, kindly reply.
Thanks,
Sri
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