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#!/usr/bin/python2
import logging, subprocess,re
from multiprocessing import Pool
from genericore import Configurable
from arping import arpingy
log = logging.getLogger('snmp_users')
DEFAULT_CONFIG= {
"snmp" : {
"server" : "10.42.0.1",
"community" : "shammunity",
"tree" : "1.3.6.1.2.1.3.1.1.2"
},
"arping" : {
"active" : True,
"dev" : "eth0"
}
}
def arping_helper(dic):
return arpingy(**dic)
class snmp_users(Configurable):
mac_list = {}
def __init__(self,config={}):
Configurable.__init__(self,DEFAULT_CONFIG)
self.load_conf(config)
def call_external(self):
"""returns an array of lines produced by snmpwalk """
conf = self.config['snmp']
out = subprocess.Popen(
['snmpwalk',
'-v2c',
'-c',conf['community'],
conf['server'],
conf['tree']],
stdout=subprocess.PIPE).communicate()[0]
return out.split('\n')
def parse_output(self,output):
""" parses output lines produced by snmpwalk """
data = []
for i in output:
if i == '':
continue
data.append(re.sub(r'.*\.(\d+\.\d+\.\d+\.\d+) = Hex-STRING: ([ 0-9A-F]*) ', r'\1 : \2',i).split(' : '))
data = [ [ip,':'.join(mac.split()).lower()] for ip,mac in data] #sanitize
return data
def update_results(self,new):
""" Verifies ip and mac via ARP Scan
in addition it adds the correct ip to the mac_list """
macl = self.mac_list
for ip,mac in new: # fill the mac_list
if not macl.get(mac,None):
macl[mac] = []
macl[mac].append(ip)
return True
def verify(self,snmp_data):
""" verifies retrieved data where data is an array of arrays where
[0] is the ip and [1] is the mac (space-delimited)"""
arp_data = self.arping_parallel(snmp_data)
self.update_results(arp_data)
def arping_parallel(self,data):
conf = self.config['arping']
if conf['active']:
p = Pool(10)
tmp = [ {'iprange':dat[0],'iface':conf['dev']} for dat in data]
try:
return filter(lambda x:x , p.map(arping_helper, tmp))
except Exception as e:
log.warning("Something happened,falling back to original data: "+ str(e))
return data
def collect(self):
output = self.call_external()
data = self.parse_output(output)
macs = self.verify(data)
self.print_results(self.mac_list)
def print_results(self,macs):
log.debug('printing results:')
print '\n'.join([ mac + " => %s" %
str(ips) for mac,ips in macs.items() ])
print '%d *unique* nodes in network' % len(macs)
if __name__ == "__main__":
logging.basicConfig(level=logging.INFO)
a = snmp_users()
a.collect()
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