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#!/usr/local/bin/python -O
"""
Retrieve a SNMP table of Object IDs starting from user specifed SNMP
Object ID(s) from arbitrary SNMP agent using SNMP v.2 GETBULK PDU.
Since MIB parser is not yet implemented in Python, this script takes and
reports Object IDs in dotted numeric representation only.
Written by Ilya Etingof <ilya@glas.net>, 2000-2002
"""
import sys
import getopt
# Import PySNMP modules
from pysnmp import asn1, v2c
from pysnmp import role
# Initialize help messages
options = 'Options:\n'
options = options + ' -p <port> port to communicate with at the agent. Default is 161.\n'
options = options + ' -r <retries> number of retries to be used in requests. Default is 5.\n'
options = options + ' -t <timeout> timeout between retries. Default is 1.\n'
usage = 'Usage: %s [options] <snmp-agent> <community> <obj-id [[obj-id] ... ]\n' % sys.argv[0]
usage = usage + options
# Initialize defaults
port = 161
retries = 5
timeout = 1
# Parse possible options
try:
(opts, args) = getopt.getopt(sys.argv[1:], 'hp:r:t:',\
['help', 'port=', 'retries=',\
'timeout='])
except getopt.error, why:
print 'getopt error: %s\n%s' % (why, usage)
sys.exit(-1)
try:
for opt in opts:
if opt[0] == '-h' or opt[0] == '--help':
print usage
sys.exit(0)
if opt[0] == '-p' or opt[0] == '--port':
port = int(opt[1])
if opt[0] == '-r' or opt[0] == '--retries':
retries = int(opt[1])
if opt[0] == '-t' or opt[0] == '--timeout':
timeout = int(opt[1])
except ValueError, why:
print 'Bad parameter \'%s\' for option %s: %s\n%s' \
% (opt[1], opt[0], why, usage)
sys.exit(-1)
if len(args) < 3:
print 'Insufficient number of arguments supplied\n%s' % usage
sys.exit(-1)
# Create SNMP manager object
client = role.manager((args[0], port))
# Pass it a few options
client.timeout = timeout
client.retries = retries
# Create a SNMP request&response objects
req = v2c.GETBULKREQUEST(community=args[1], \
non_repeaters=0, max_repetitions=256)
rsp = v2c.RESPONSE()
# Store table headers
head_oid = asn1.OBJECTID(args[2])
# BER encode initial SNMP Object IDs to query
encoded_oids = [ head_oid.encode() ]
# Traverse agent MIB
while 1:
# Encode SNMP request message and try to send it to SNMP agent
# and receive a response
(answer, src) = client.send_and_receive(\
req.encode(encoded_oids=encoded_oids))
# Attempt to decode SNMP response
rsp.decode(answer)
# Make sure response matches request (request IDs, communities, etc)
if req != rsp:
raise 'Unmatched response: %s vs %s' % (str(req), str(rsp))
# Decode BER encoded Object IDs.
oids = map(lambda x: x[0], map(asn1.OBJECTID().decode, \
rsp['encoded_oids']))
# Decode BER encoded values associated with Object IDs.
vals = map(lambda x: x[0](), map(asn1.decode, rsp['encoded_vals']))
# Check for remote SNMP agent failure
if rsp['error_status']:
# SNMP agent reports 'no such name' when walk is over XXX
if rsp['error_status'] == 2:
# One of the tables exceeded
for l in oids, vals, head_oids:
del l[rsp['error_index']-1]
else:
raise 'SNMP error #' + str(rsp['error_status']) + ' for OID #' \
+ str(rsp['error_index'])
# Cut OID list by fisrt non-prefix OID
for idx in range(len(oids)):
if not head_oid.isaprefix(oids[idx]):
oids = oids[:idx]
vals = vals[:idx]
break
if not oids:
sys.exit(0)
# Print out results
for (oid, val) in map(None, oids, vals):
print oid + ' ---> ' + str(val)
# BER encode next SNMP Object IDs to query
encoded_oids = map(asn1.OBJECTID().encode, oids[-1:])
# Update request object
req['request_id'] = req['request_id'] + 1
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