mininet-wifi examples 官方例子详解(二）

谁借莪１个温暖的怀抱￠ 2022-03-18 05:45 185阅读 0赞

本博客总结了examples文件下面的例子的用法，需要注意的事项以及今后编码需要用到的技巧。有些例子经过了自己的改动。

## 例4 associationControl ##

这个例子是让接入点进行移动，然后在移动的过程中使用ssf选择信号最强的接入  
![在这里插入图片描述][20190219113143570.png]

#!/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首先从无信号的地方进入到ap3的范围，这个时候，sta3从无连接转入到连接sta3.  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zNjM3Mjg3OQ_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][20190219114329726.png]  
sta3继续移动，可以看到，当进入ap2范围后，随着ap2的信号越来越大，从ap3的连接转入到ap2的连接。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zNjM3Mjg3OQ_size_16_color_FFFFFF_t_70 1]

1.  注意随机移动函数的写法。
2.  如何在终端输入接入点信息。

--------------------

## 例5 authentication：wifi密码验证 ##

#!/usr/bin/python
    
    'This example shows how to work with authentication'
    #wifi密码验证实例
    
    
    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有一个加密，然后sta通过密码连接上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()

这个是通过range来确定通信范围的，可以看到移动之后，sta1从没连接到连接到ap1，最后从ap1转换到ap2  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zNjM3Mjg3OQ_size_16_color_FFFFFF_t_70 2]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zNjM3Mjg3OQ_size_16_color_FFFFFF_t_70 3]

[20190219113143570.png]: /images/20220318/c9c5a234a0374a0bb6f51383d1b4b032.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zNjM3Mjg3OQ_size_16_color_FFFFFF_t_70]: /images/20220318/fdf8dfebbcb64b31a6608e5304855208.png
[20190219114329726.png]: /images/20220318/0a4e77fba4534d87ad245cff26b5105b.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zNjM3Mjg3OQ_size_16_color_FFFFFF_t_70 1]: /images/20220318/eed614f7f6ef4c14ba585084c8dc7204.png
[handover.py]: http://handover.py
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zNjM3Mjg3OQ_size_16_color_FFFFFF_t_70 2]: /images/20220318/47ca3182be704b7e819276dded96640b.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zNjM3Mjg3OQ_size_16_color_FFFFFF_t_70 3]: /images/20220318/b3a018d19c304c618c9dfb74687f185f.png