python操作 linux连接wifi，查看wifi连接状态方法

 
Python连接Ubuntu 环境 wifi流程
 
 

1、获取网络接口列表

通过wifi_net.py 的query_net_cards方法获取终端物理网络接口列表及IP信息：
获取物理网络接口列表：

ls -d /sys/class/net/*/device | cut -d/ -f5

或者：

find /sys/class/net -type l -not -lname '*virtual*' -printf '%f\n'
iwifconfig

代码示例：

# 查询所有物理网卡
    def _query_net_card_info(if_name):
        net_card_info = {
            "mac": "",
            "type": "eth",
            "ip": "",
            "netmask": "",
        }
        try:
            net_info = netifaces.ifaddresses(if_name)
        except ValueError:
            logger.error("No such interface: %s" % if_name)
            return net_card_info
        # 如果为无线网卡，将修改网卡类型为wlan
        if if_name in common.cmd_excute("iw dev | awk '$1==\"Interface\" {print $2}'"):
            net_card_info["type"] = "wlan"
 
        net_card_info["mac"] = net_info[netifaces.AF_LINK][0]["addr"].upper()
        ipv4_info = net_info.get(netifaces.AF_INET)
        if ipv4_info:
            net_card_info["ip"] = ipv4_info[0]["addr"]
            net_card_info["netmask"] = ipv4_info[0]["netmask"]
        return net_card_info
 
    @staticmethod
    def query_net_cards():
        """
        {
        "enp2s0":       // 接口名称
            {
                "mac": "98:FA:9B:99:E5:6A",      // MAC地址
                "type": "eth",                  // 接口类型，eth-有线网卡, wlan-无线网卡
                "ip": "192.168.2.90",           // 接口当前IP
                "netmask": "255.255.255.0",     // 接口掩码
                "dns":"192.168.2.1",            // dns服务器ip
                "gateway": "192.168.2.1"         // 网管地址
            },
        "wlan0":
            {
                "mac": "98:FA:9B:99:E5:6A",      // MAC地址
                "type": "wlan",                 // 接口类型，eth-有线网卡, wlan-无线网卡
                "ip": "",                       // 接口当前IP
                "netmask": "",                  // 接口掩码
                "dns":"192.168.2.1",            // dns服务器ip
                "gateway": "192.168.2.1"        // 网管地址
            }
        }
        """
        net_cards = dict()
        # 获取所有物理网卡名称
        command = "ls -d /sys/class/net/*/device | cut -d/ -f5"
        interfaces = common.cmd_excute(command)
 
        # 获取dns服务器ip
        dns_path = '/etc/resolv.conf'
        dns_list = []
        if os.path.exists(dns_path):
            dns_list = common.cmd_excute("cat %s|grep ^nameserver|awk '{print $2}'" % dns_path, b_print=False)
        # 获取网管地址
        gateways = netifaces.gateways().get('default').get(netifaces.AF_INET)
 
        for interface in interfaces:
            net_card = Network._query_net_card_info(if_name=interface)
            net_card["dns"] = dns_list if dns_list else ""
            net_card["gateway"] = gateways[0] if gateways else ""
            net_cards[interface] = net_card
        return net_cards

2、获取无线网络列表
通过wifi_net.py 的query_wifi_ssids方法获取扫描到的无线网络列表：

扫描无线网络:
通过iwlist 命令获取，需要解析命令行输出：

iwlist wlan0 scan

或，通过python库 wifi解析：

        def query_wifi_ssids(wifi_if):
        import wifi
        import codecs
        ssid_list = []
        try:
            common.cmd_excute("ifconfig %s up" % wifi_if)
            cell_list = wifi.Cell.all(wifi_if)
        except wifi.exceptions.InterfaceError as e:
            # 可能非Wifi接口
            logger.error("_get_wireless_ssid_list exception: %s" % traceback.format_exc())
            return ssid_list
 
        for cell in cell_list:
            ssid_list.append(
                {
                    "ssid": codecs.utf_8_decode(cell.ssid)[0].encode('utf-8'),
                    "mac": cell.address,
                    "encrypted": cell.encrypted,
                    "quality": cell.quality,
                    # "signal": cell.signal,
                }
            )
 
        return ssid_list

返回数据示例：

[
        {
            "ssid": "leifeng_2",             // 无线网络SSID
            "mac": "58:D9:D5:D3:FB:01",    // 无线接入点MAC
            "enctypted": True，              // 是否加密
             "quality": cell.quality     //信号强度
        },
        {
            "ssid": "leifeng_2_5G",
            "mac": "58:D9:D5:D3:FB:05",
            "enctypted": True，
             "quality": cell.quality
        }
    ]

3、连接无线网络，检查连接结果
connect_wifi方法连接无线网络：

# 配置无线网络:
wpa_passphrase "leifeng_2" "radeon123" > /etc/wpa_supplicant/wpa_supplicant.conf
# leifeng_2网络名称   radeon123 wifi密码
# 连接无线网络:
wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf &
# -B后台执行

    # 代码示例
    def connect_wifi(net_card, ssid, password, static_ip=""):
        """连接wifi"""
        wifi_conf_command = 'wpa_passphrase "%s" "%s" > /etc/wpa_supplicant/wpa_supplicant.conf' % (ssid, password)
        common.cmd_excute(wifi_conf_command)
 
        wifi_conn_command = 'wpa_supplicant -i %s -c /etc/wpa_supplicant/wpa_supplicant.conf -B > /tmp/wifi_conn.txt' % net_card
        logger.debug("Start wifi connection: %s " % wifi_conn_command)
        common.cmd_excute(wifi_conn_command)
        if not static_ip:
            # flush
            flush_command = "ip addr flush dev %s" % net_card
            common.cmd_excute(flush_command)
            # 自动分配ip地址
            auto_command = "dhclient %s" % net_card
            common.cmd_excute(auto_command)
        else:
            # 配置静态ip
            manual_common = "ifconfig %s %s" %(net_card,static_ip)
            common.cmd_excute(manual_common)
        for i in range(10):
            wifi_status_command = "cat /sys/class/net/{}/operstate".format(net_card)
            wifi_status_process = subprocess.Popen(wifi_status_command, stdin=subprocess.PIPE, stdout=subprocess.PIPE, shell=True)
            if wifi_status_process.stdout.readline() == "up":
                logger.debug("wifi %s connection success") % ssid
                break
            time.sleep(1)
        else:
            wifi_result_command = "cat /tmp/wifi_conn.txt | grep reason=WRONG_KEY"
            wifi_result_process = subprocess.Popen(wifi_result_command, stdin=subprocess.PIPE, stdout=subprocess.PIPE,
                                             shell=True)
            if wifi_result_process.stdout.readline():
                logger.debug("wifi %s connection fail,password error") % ssid
                return False,"password error"
            logger.debug("wifi %s connection timeout") % ssid
            return False,"connect timeout"
        return True,"success"

4、封装cmd命令

定义common.py文件，

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2020/11/11 下午3:21
import subprocess
 
def shell_excute(rsyncStr, shell=False, b_print=True):
    p = subprocess.Popen(rsyncStr, shell=shell,
                         stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    output = "".join(p.communicate())
    return output
 
def cmd_excute(command, b_trip=True, b_print=True):
    ret_list = []
    cmd_ret = shell_excute(command, shell=True, b_print=b_print).splitlines()
    if b_trip:
        for sline in cmd_ret:
            if len(sline.strip()) != 0:
                ret_list.append(sline.strip())
    else:
        ret_list = cmd_ret
    return ret_list