Loading uncompiled MIB files.

I’m stumped on what I would think would be a simple task. The sample script “SNMP MIB browser” gives every indication that compiler.addMibCompiler(mibBuilder, sources=['/usr/share/snmp/mibs']) adds a MIB compiler to load uncompiled MIBs and that mibBuilder.addMibSources(builder.DirMibSource('/opt/pysnmp_mibs')) is to add a source containing pre-compiled MIBs.

#!/usr/bin/env python
from pysnmp import debug
from pysnmp.smi import builder, view, compiler, rfc1902, error

def main():
#    debug.setLogger(debug.Debug('all'))
    mibBuilder = builder.MibBuilder()
    compiler.addMibCompiler(mibBuilder, sources = ['file:///home/user/python-udp/MIBs', ])
    mibBuilder.loadModules('SNMPv2-SMI')
    mibBuilder.loadModules('SNMPv2-TC')
    mibBuilder.loadModules('INET-ADDRESS-MIB')
    mibBuilder.loadModules('IANAifType-MIB')
    mibViewController = view.MibViewController(mibBuilder)
    modName = mibViewController.getFirstModuleName()
    while 1:
        if modName: print(modName)
        try:
            modName = mibViewController.getNextModuleName(modName)
        except error.SmiError:
            break
    return

if __name__ == '__main__':
    main()

The loadModules() all work until the one to load IANAifType-MIB which is the first one which isn’t included in pysnmp itself. At no point does it give any indication that it’s looking in the directory I specified. I’ve tried numerous variations on the theme but cannot find anything which works. Is there a concise code snippet for loading uncompiled MIBs? Thanks in advance.

Traceback (most recent call last):
  File "./loadmib.py", line 24, in <module>
    main()
  File "./loadmib.py", line 12, in main
    mibBuilder.loadModules('IANAifType-MIB')
  File "/home/user/python-udp/venv/lib/python2.7/site-packages/pysnmp/smi/builder.py", line 388, in loadModules
    raise error.MibNotFoundError('%s compilation error(s): %s' % (modName, errs))
pysnmp.smi.error.MibNotFoundError: IANAifType-MIB compilation error(s): missingcaused by <class 'pysnmp.smi.error.MibNotFoundError'>: MIB file "IANAifType-MIB.py[co]" not found in search path (DirMibSource('/home/user/python-udp/venv/lib/python2.7/site-packages/pysnmp/smi/mibs'), DirMibSource('/home/user/python-udp/venv/lib/python2.7/site-packages/pysnmp/smi/mibs/instances'), DirMibSource('pysnmp_mibs'), DirMibSource('/home/user/.pysnmp/mibs'))caused by <type 'exceptions.IOError'>: [Errno 2] No suitable module found: 'IANAifType-MIB'

[etingof]

Your code seems correct and it works for me. Try adding some pysmi debugging:

from pysmi import debug as pysmi_debug
pysmi_debug.setLogger(pysmi_debug.Debug('compiler'))

To see the search process:

2019-01-19 09:18:24,569 pysmi: trying source FileReader{"/home/user/python-udp/MIBs"}
2019-01-19 09:18:25,362 pysmi: no IANAifType-MIB found at FileReader{"/home/user/python-udp/MIBs"}
2019-01-19 09:18:25,362 pysmi: no IANAifType-MIB found everywhere
2019-01-19 09:18:25,362 pysmi: MIBs analyzed 0, MIBs failed 1

BTW, if you add this URL to the MIBs repo, all your MIBs would be resolved:

    compiler.addMibCompiler(mibBuilder, sources = [
        'file:///home/user/python-udp/MIBs',
        'http://mibs.snmplabs.com/asn1/'])

[etingof]

Do you also have the SNMPv2-SMI MIB in your local collection?

Generally, to compile a MIB you have to have all the MIBs it imports (and the MIBs they import and so forth). In other words, you have to have all the MIBs in the dependency chain in uncompiled form.