pysnmp convert (.my) to (.py) issue. Why always asks me to install the package?

Question

I am using Linux v.16

I installed pysnmp package succesfully. I am trying to convert the .my to .py but I am facing errors:

1. using this command: smidump -f python custom-mib.my | libsmi2pysnmp>custom-mib.py

The output was:

smidump: module 'custom-mib' contains errors, expect flawed output
smidump: aborting due to severe parsing errors
smidump: use the -k option to force continuation
The program 'libsmi2pysnmp' is currently not installed.
            You can install it by typing: apt install python-pysnmp4

( the package is already installed. To make sure, when I apply the command: apt install python-pysnmp4, the result is "python-pysnmp4 is already the newest version"

2. When I use the command: build-pysnmp-mib -o custom-mib.py custom-mib.my, I am facing the same error saying to install the same package.

Answer 1

What pysnmp version are you running? It it's past 4.3.x (inclusive), you do not really need to do any MIB conversion by hand -- it's all being done automatically by pysnmp/pysmi packages interplay. You just pass pysnmp MIB name in your query -- it should be able to do the rest.

If you can't upgrade to the latest pysnmp version, you can use the mibdump tool from the pysmi package instead of (long time obsolete) smidump/build-pysnmp-mib/libsmi2pysnmp toolset to convert .my into .py and pass those .py MIBs to your old pysnmp instance.

Here is an example mibdump.py tool invocation that converts the IF-MIB into pysnmp classes:

$ pip install pysmi
...
$ mibdump.py --mib-source /my/mib/dir \
             --mib-source http://mibs.snmplabs.com/asn1/@mib@ \
             --destination-format pysnmp \
             IF-MIB
Source MIB repositories: /my/mib/dir, http://mibs.snmplabs.com/asn1/@mib@
Borrow missing/failed MIBs from: http://mibs.snmplabs.com/pysnmp/notexts/@mib@
Existing/compiled MIB locations: pysnmp.smi.mibs, pysnmp_mibs
Compiled MIBs destination directory: /home/user/.pysnmp/mibs
MIBs excluded from code generation: INET-ADDRESS-MIB, PYSNMP-USM-MIB, RFC-1212, RFC-1215, RFC1065-SMI, RFC1155-SMI, RFC1158-MIB, RFC1213-MIB, SNMP-FRAMEWORK-MIB, SNMP-TARGET-MIB, SNMPv2-CONF, SNMPv2-SMI, SNMPv2-TC, SNMPv2-TM, TRANSPORT-ADDRESS-MIB
MIBs to compile: IF-MIB
Destination format: pysnmp
Parser grammar cache directory: not used
Also compile all relevant MIBs: yes
Rebuild MIBs regardless of age: no
Dry run mode: no
Create/update MIBs: yes
Byte-compile Python modules: yes (optimization level no)
Ignore compilation errors: no
Generate OID->MIB index: no
Generate texts in MIBs: no
Keep original texts layout: no
Try various file names while searching for MIB module: yes
Created/updated MIBs: IANAifType-MIB, IF-MIB
Pre-compiled MIBs borrowed: 
Up to date MIBs: SNMPv2-CONF, SNMPv2-MIB, SNMPv2-SMI, SNMPv2-TC
Missing source MIBs: 
Ignored MIBs: 
Failed MIBs: 

The compiled MIBs end up in ~/.pysnmp/mibs unless you change default destination directory.