FAQ:Coding 04

Mib2c complains about not having a "valid OID" - what does this mean?

This probably means that you gave it the name of a MIB file (or module), rather than the name of an object defined in that file. Mib2c expects the name of a 'root' object, and will generate a template for the sub-tree starting from there.

If you've got a file 'MY-MIB.txt', defining the MIB module 'MY-MIB' which contains a subtree based on the object 'myMib', then you should invoke mib2c as

   "mib2c .... myMib"

rather than

   "mib2c .... MY-MIB.txt"

or

   "mib2c .... MY-MIB"

Note that you'll probably also have to add your MIB to the list of MIBs that are loaded automatically, in order for mib2c to recognise the name of this object. So the command would typically be

   "MIBS=+MY-MIB mib2c .... myMib"

or

   "MIBS=ALL     mib2c .... myMib"

   FAQ:Coding
   

1. How do I write C code to integrate with the agent?
2. How does the agent fetch the value of a MIB variable from the system?
3. Mib2c complains about a missing "mib reference" - what does this mean?
4. Mib2c complains about not having a "valid OID" - what does this mean?
5. Why doesn't mib2c like the MIB file I'm giving it?
6. Mib2c ignores my MIB and generates a pair of 'mib-2' code files. Why?
7. What's the difference between the various mib2c configuration files?
8. Which mib2c configuration file should I use?
9. How can I have mib2c generate code for both scalars and tables?
10. Are there any examples, or documentation for generating MIB modules?
11. Where should I put the files produced by 'mib2c'?
12. Why doesn't my new MIB module report anything?
13. Why does the iterator call my get_{first,next} routines so often?
14. How can I get the agent to generate a trap (or inform)?
15. How can I get an AgentX sub-agent to generate a trap (or inform)?
16. How can I get the agent to send an SNMPv1 (or SNMPv2c) trap?
17. How can I get the agent to include varbinds with an SNMPv1 trap?
18. How can I get the agent to send an SNMPv1 enterprise-specific trap?
19. How can I get the agent to send an SNMPv3 trap (or inform)?
20. Why does calling 'send_v2trap' generate an SNMPv1 trap (or vice versa)?
21. How can I register a MIB module in a different (SNMPv3) context?