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105 lines
3.1 KiB
Python
105 lines
3.1 KiB
Python
2 years ago
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import configparser
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from mininet.net import Mininet
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from mininet.topo import Topo
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from mininet.node import Node
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from mininet.cli import CLI
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from mininet.link import TCLink
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from mininet.log import setLogLevel
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class MyRouter (Node):
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def config(self, **params):
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super(MyRouter, self).config(**params)
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self.cmd('sysctl net.ipv4.ip_forward=1') #Enable forwarding on the router
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def terminate(self):
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self.cmd('sysctl net.ipv4.ip_forward=0') #Disable forwarding on the router
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super(MyRouter, self).terminate
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def build_topology(config_file):
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topo = Topo()
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with open(config_file, 'r') as file:
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for line in file:
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line = line.strip()
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if line.startswith('#'): #Skip comment
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continue
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parts = line.split(" ") #Parse the topology file using spaces
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if parts[0] == 'host': #Parse hosts
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host_name = parts[1]
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host_ip = parts[2]
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host_nexthop = 'via ' + parts[3]
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topo.addHost(host_name, ip=host_ip, defaultRoute=host_nexthop)
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elif parts[0] == 'router': #Parse routers
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router_name = parts[1]
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router_ip = parts[2]
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topo.addNode(router_name, cls=MyRouter, ip=router_ip)
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elif parts[0] == 'switch': #Parse switches
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switch_name = parts[1]
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topo.addSwitch(switch_name)
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elif parts[0] == 'linkSH': #Parse links switches to hosts
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node1 = parts[1]
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node2 = parts[2]
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topo.addLink(node1, node2)
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elif parts[0] == 'linkSS': #Parse links switches to switches
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node1 = parts[1]
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node2 = parts[2]
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topo.addLink(node1, node2)
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elif parts[0] == 'linkHR': #Parse links hosts to routers
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node1 = parts[1]
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node2 = parts[2]
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intf_name2 = parts[3]
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n2_ip = parts[4]
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topo.addLink(node1, node2, intfName2=intf_name2, params2={'ip' : n2_ip})
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elif parts[0] == 'linkRR': #Parse links routers to routers
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node1 = parts[1]
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node2 = parts[2]
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intf_name1 = parts[3]
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intf_name2 = parts[4]
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ip1 = parts[5]
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ip2 = parts[6]
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topo.addLink(node1, node2, intfName1=intf_name1, intfName2=intf_name2, params1={'ip' : ip1}, params2={'ip' : ip2})
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# elif parts[0] == 'route': #Parse routing tables
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# name = parts[1]
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# for node in topo.nodes():
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# if node == name:
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# (node).cmd('ip route add 0.0.0.0/0 via 10.0.0.1 dev r1-eth2')
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# break
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# (topo.getNodeByName('r1')).cmd('ip route add 0.0.0.0/0 via 10.0.0.1 dev r1-eth2')
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return topo
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def run_topology(config_file):
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setLogLevel('info') #Different logging levels are 'info' 'warning' 'error' 'debug'
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topo = build_topology(config_file)
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net = Mininet(topo=topo, link=TCLink)
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net.start() #Starting the network
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with open(config_file, 'r') as file: #Search in the configuration file for routing table
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for line in file:
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line = line.strip()
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if line.startswith('#'): #Skip comment
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continue
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parts = line.split(" ")
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if parts[0] == 'route': #Parse routing tables
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name = parts[1]
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pck_src = parts[2]
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pck_nexthop = parts[3]
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interf = parts[4]
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cmd = 'ip route add ' + pck_src + ' via ' + pck_nexthop + ' dev ' + interf
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(net.getNodeByName(name)).cmd(cmd)
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net.pingAll()
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# CLI(net)
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net.stop() #Stopping the network
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if __name__ == '__main__':
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run_topology('MininetTopo.conf')
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