How to get ipRouteTable from Cisco router?

[gvozdikov]

Hello!

I want to get route tables from Cisco routers in the network. What i
have:

import re

from pysnmp.entity.rfc3413.oneliner import cmdgen

s = r'(%s)' % ('(??:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.)\
{3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)')
pattern = re.compile(s)
file = 'routers.txt'
s = open(file).read()
i = 0
router_list = []
while True:
match = pattern.search(s, i)
if match:
router_list.append(match.group(1))
i = match.end() + 1
else:
break

class router:
def __init__(self, who):
self.name = who

routetable = {}

router1 = router(router_list[0])

cmdGen = cmdgen.CommandGenerator()
errorIndication, errorStatus, errorIndex, varBindTable =
cmdGen.nextCmd(
cmdgen.CommunityData('test-agent', public, 0),
cmdgen.UdpTransportTarget((router1.name, 161)),
(1,3,6,1,2,1,4,21,1,1))

if errorIndication:
print errorIndication
else:
if errorStatus:
print '%s at %s\n' %
(errorStatus.prettyPrint(),varBindTable[-1][int(errorIndex)-1])
else:
for varBindTableRow in varBindTable:
for oid, val in varBindTableRow:
print varBindTableRow


Result:

Code: Select all
[(ObjectName('1.3.6.1.2.1.4.21.1.1.0.0.0.0'), IpAddress('0.0.0.0'))]
[(ObjectName('1.3.6.1.2.1.4.21.1.1.10.9.0.0'), IpAddress('10.9.0.0'))]
[(ObjectName('1.3.6.1.2.1.4.21.1.1.192.168.1.0'),
IpAddress('192.168.1.0'))]


How can i get IpAddress values from this list and put they in the
dictionary? Or may be there is much better solution?

 

[gvozdikov]

Hello!

I want to get route tables from Cisco routers in the network. What i
have:

import re

from pysnmp.entity.rfc3413.oneliner import cmdgen

s = r'(%s)' % ('(??:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.)\
{3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)')
pattern = re.compile(s)
file = 'routers.txt'
s = open(file).read()
i = 0
router_list = []
while True:
    match = pattern.search(s, i)
    if match:
        router_list.append(match.group(1))
        i = match.end() + 1
    else:
        break

class router:
    def __init__(self, who):
        self.name = who

    routetable = {}

router1 = router(router_list[0])

cmdGen = cmdgen.CommandGenerator()
errorIndication, errorStatus, errorIndex, varBindTable =
cmdGen.nextCmd(
    cmdgen.CommunityData('test-agent', public, 0),
    cmdgen.UdpTransportTarget((router1.name, 161)),
    (1,3,6,1,2,1,4,21,1,1))

if errorIndication:
        print errorIndication
else:
    if errorStatus:
            print '%s at %s\n' %
(errorStatus.prettyPrint(),varBindTable[-1][int(errorIndex)-1])
    else:
        for varBindTableRow in varBindTable:
            for oid, val in varBindTableRow:
                 print varBindTableRow

Result:

Code: Select all
[(ObjectName('1.3.6.1.2.1.4.21.1.1.0.0.0.0'), IpAddress('0.0.0.0'))]
[(ObjectName('1.3.6.1.2.1.4.21.1.1.10.9.0.0'), IpAddress('10.9.0.0'))]
[(ObjectName('1.3.6.1.2.1.4.21.1.1.192.168.1.0'),
IpAddress('192.168.1.0'))]

How can i get IpAddress values from this list and put they in the
dictionary? Or may be there is much better solution?

Solution is pretty simple:

RouteTable = {
"ipRouteDest": (1, 3, 6, 1, 2, 1, 4, 21, 1, 1),
"ipRouteIfIndex": (1, 3, 6, 1, 2, 1, 4, 21, 1, 2),
"ipRouteNextHop": (1, 3, 6, 1, 2, 1, 4, 21, 1, 7),
"ipRouteType": (1, 3, 6, 1, 2, 1, 4, 21, 1, 8),
"ipRouteMask": (1, 3, 6, 1, 2, 1, 4, 21, 1, 11),
}

def hex2dec(mack):
return int(mack, 16)

def convertIp(hexip):
ip = map(hex, map(ord, hexip))
ip = map(hex2dec, ip)
ip = re.sub("\,", ".",re.sub("\'|\[|\]|\s","", str(ip)))
return ip

def walk(host, community, oid):
cmdGen = cmdgen.CommandGenerator()
errorIndication, errorStatus, errorIndex, varBindTable =
cmdGen.nextCmd(
cmdgen.CommunityData('test-agent', community, 0),
cmdgen.UdpTransportTarget((host, 161)), oid)

if errorIndication:
print errorIndication
else:
if errorStatus:
print '%s at %s\n' %
(errorStatus.prettyPrint(),varBindTable[-1][int(errorIndex)-1])
else:
val = []
for varBindTableRow in varBindTable:
for oid in
varBindTableRow:
try:
val.append(convertIp(varBindTableRow[0][1]))
except:
val.append(str(varBindTableRow[0][1]))
return val
ipRouteDest = walk(router1.name, community, RouteTable["ipRouteDest"])
ipRouteIfIndex = walk(router1.name, community,
RouteTable["ipRouteIfIndex"])
ipRouteNextHop = walk(router1.name, community,
RouteTable["ipRouteNextHop"])
ipRouteType = walk(router1.name, community, RouteTable["ipRouteType"])
ipRouteMask = walk(router1.name, community, RouteTable["ipRouteMask"])

table = zip(ipRouteIfIndex, ipRouteNextHop, ipRouteType, ipRouteMask)
routetable = dict(zip(ipRouteDest, table))

print routetable

Result:

{'10.9.0.0': ('0', '192.168.1.1', '4', '255.255.0.0'), '0.0.0.0':
('0', '192.168.1.1', '4', '0.0.0.0'), '192.168.1.0': ('1',
'192.168.1.254', '3', '255.255.255.0')}

But how create class "router" with routetable as attribute?