mininet-wifi examples 官方例子詳解(二）

本部落格總結了examples檔案下面的例子的用法，需要注意的事項以及今後編碼需要用到的技巧。有些例子經過了自己的改動。

例4 associationControl

這個例子是讓接入點進行移動，然後在移動的過程中使用ssf選擇信号最強的接入

#!/usr/bin/python

'Setting mechanism to optimize the use of APs'

from mininet.node import Controller
from mininet.log import setLogLevel, info
from mn_wifi.cli import CLI_wifi
from mn_wifi.net import Mininet_wifi
from time import sleep


def topology():
    "Create a network."
    net = Mininet_wifi(controller=Controller)

    info("*** Creating nodes\n")
    net.addStation('sta1', mac='00:00:00:00:00:02', ip='10.0.0.2/8')
    net.addStation('sta2', mac='00:00:00:00:00:03', ip='10.0.0.3/8')
    sta3 = net.addStation('sta3', mac='00:00:00:00:00:04', ip='10.0.0.4/8')
    net.addStation('sta4', mac='00:00:00:00:00:05', ip='10.0.0.5/8')
    net.addStation('sta5', mac='00:00:00:00:00:06', ip='10.0.0.6/8')
    net.addStation('sta6', mac='00:00:00:00:00:07', ip='10.0.0.7/8')
    net.addStation('sta7', mac='00:00:00:00:00:08', ip='10.0.0.8/8')
    net.addStation('sta8', mac='00:00:00:00:00:09', ip='10.0.0.9/8')
    net.addStation('sta9', mac='00:00:00:00:00:10', ip='10.0.0.10/8')
    net.addStation('sta10', mac='00:00:00:00:00:11', ip='10.0.0.11/8')
    ap1 = net.addAccessPoint('ap1', ssid='ssid-ap1', mode='g', channel='1',
                             position='50,50,0')
    ap2 = net.addAccessPoint('ap2', ssid='ssid-ap2', mode='g', channel='6',
                             position='70,50,0', range=30)
    ap3 = net.addAccessPoint('ap3', ssid='ssid-ap3', mode='g', channel='11',
                             position='90,50,0')
    c1 = net.addController('c1')

    net.setPropagationModel(model="logDistance", exp=5)

    info("*** Configuring wifi nodes\n")
    net.configureWifiNodes()

    info("*** Associating and Creating links\n")
    net.addLink(ap1, ap2)
    net.addLink(ap2, ap3)

    net.plotGraph(max_x=120, max_y=120)

    net.setMobilityModel(time=0, model='RandomWayPoint', max_x=120, max_y=120,
                         min_v=0.3, max_v=0.5, seed=1, ac_method='ssf')

    info("*** Starting network\n")
    net.build()
    c1.start()
    ap1.start([c1])
    ap2.start([c1])
    ap3.start([c1])

    while True:
        info('%r\n' % sta3.cmd('iw dev sta3-wlan0 link'))
        sleep(2)

    info("*** Running CLI\n")
    CLI_wifi(net)

    info("*** Stopping network\n")
    net.stop()


if __name__ == '__main__':
    setLogLevel('info')
    topology()
           

可以看到，sta3首先從無信号的地方進入到ap3的範圍，這個時候，sta3從無連接配接轉入到連接配接sta3.

sta3繼續移動，可以看到，當進入ap2範圍後，随着ap2的信号越來越大，從ap3的連接配接轉入到ap2的連接配接。

1. 注意随機移動函數的寫法。
2. 如何在終端輸入接入點資訊。

例5 authentication：wifi密碼驗證

#!/usr/bin/python

'This example shows how to work with authentication'
#wifi密碼驗證執行個體


from mininet.log import setLogLevel, info
from mn_wifi.cli import CLI_wifi
from mn_wifi.net import Mininet_wifi


def topology():
    "Create a network."
    net = Mininet_wifi()

    info("*** Creating nodes\n")
    sta1 = net.addStation('sta1', passwd='123456789a', encrypt='wpa2')
    sta2 = net.addStation('sta2', passwd='123456789a', encrypt='wpa2')
    ap1 = net.addAccessPoint('ap1', ssid="simplewifi", mode="g", channel="1",
                             passwd='123456789a', encrypt='wpa2',
                             failMode="standalone", datapath='user')

    info("*** Configuring wifi nodes\n")
    net.configureWifiNodes()

    info("*** Associating Stations\n")
    net.addLink(sta1, ap1)
    net.addLink(sta2, ap1)

    info("*** Starting network\n")
    net.build()
    ap1.start([])

    info("*** Running CLI\n")
    CLI_wifi(net)

    info("*** Stopping network\n")
    net.stop()


if __name__ == '__main__':
    setLogLevel('info')
    topology()

           

可以看到，ap有一個加密，然後sta通過密碼連接配接上wifi

例6 handover

handover.py shows how to create a simple mobility scenario where a station moves past two access points, causing the station to hand off from one to the other.

#!/usr/bin/python

'Example for Handover'
'handover.py shows how to create a simple mobility scenario where a station moves past two access points,' \
' causing the station to hand off from one to the other.'

from mininet.node import Controller
from mininet.log import setLogLevel, info
from mn_wifi.cli import CLI_wifi
from mn_wifi.net import Mininet_wifi
from time import sleep


def topology():
    "Create a network."
    net = Mininet_wifi(controller=Controller)

    info("*** Creating nodes\n")
    sta1 = net.addStation('sta1', mac='00:00:00:00:00:02', ip='10.0.0.2/8',
                          range=50)
    sta2 = net.addStation('sta2', mac='00:00:00:00:00:03', ip='10.0.0.3/8',
                          range=20)
    ap1 = net.addAccessPoint('ap1', ssid='ssid-ap1', mode='g', channel='1',
                             position='15,30,0', range=30)
    ap2 = net.addAccessPoint('ap2', ssid='ssid-ap2', mode='g', channel='6',
                             position='55,30,0', range=30)
    c1 = net.addController('c1')

    net.setPropagationModel(model="logDistance", exp=5)

    info("*** Configuring wifi nodes\n")
    net.configureWifiNodes()

    info("*** Creating links\n")
    net.addLink(ap1, ap2)

    net.plotGraph(max_x=100, max_y=100)

    net.startMobility(time=0)
    net.mobility(sta1, 'start', time=1, position='10,30,0')
    net.mobility(sta2, 'start', time=2, position='10,40,0')
    net.mobility(sta1, 'stop', time=10, position='60,30,0')
    net.mobility(sta2, 'stop', time=10, position='25,40,0')
    net.stopMobility(time=11)

    info("*** Starting network\n")
    net.build()
    c1.start()
    ap1.start([c1])
    ap2.start([c1])

    time = 0
    while time <= 10:
        info('%r\n' % sta1.cmd('iw dev sta1-wlan0 link'))
        sleep(1)
        time += 1
    info("*** Running CLI\n")
    CLI_wifi(net)

    info("*** Stopping network\n")
    net.stop()


if __name__ == '__main__':
    setLogLevel('info')
    topology()

           

這個是通過range來确定通信範圍的，可以看到移動之後，sta1從沒連接配接到連接配接到ap1，最後從ap1轉換到ap2