How to get ipRouteTable from Cisco router?

[gvozdikov]

On 29 апр, 19:12, gvozdikov <t1k0v.s... at gmail.com> wrote:
> 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?