0x00 環境

• Kali Linux （可以是樹莓派）
• 網絡卡晶片 RTL8188CUS

0x01 確保託管開啟

root@zrools:~# apt-get -y install rfkill
root@zrools:~# rfkill list
0: phy0: Wireless LAN
        Soft blocked: yes
        Hard blocked: no
root@zrools:~# rfkill unblock wlan   # 或者 rfkill unblock all
root@zrools:~# rfkill list
0: phy0: Wireless
 
 LAN
        Soft blocked: no
        Hard blocked: no
root@zrools:~#

0x02 DHCP與DNS

root@zrools:~# apt-get -y install dnsmasq

# 修改dnsmasq配置
root@zrools:~# vi /etc/dnsmasq.conf
interface=wlan0  # 網絡卡介面
listen-address=192.168.127.1
dhcp-range=192.168.127.2,192.168.127.254,12h  # 地址池與租期
dhcp-option=3
 
,192.168.127.1
dhcp-option=6,8.8.8.8  # DNS分配

0x03 Hostapd

某些版本的Hostapd不支援RTL8188CUS晶片，這裡用kali dev源直接安裝hostapd v2.3-2沒用問題

[email protected]:~# apt-get -y install hostapd

# 修改配置路徑
[email protected]:~# vi /etc/default/hostapd
DAEMON_CONF="/etc/hostapd/hostapd.conf"

# 修改配置
[email protected]
 
:~# vi /etc/hostapd/hostapd.conf
# Basic configuration 
channel=1
ssid=wifi
interface=wlan0

# Hardware configuration
hw_mode=g
driver=nl80211

#_Ap_
wpa=2
auth_algs=3

# WPA and WPA2 configuration
rsn_pairwise=CCMP
wpa_pairwise=TKIP
wpa_key_mgmt=WPA-PSK
wpa_passphrase=password  # WIFI密碼

ps: 測試配置可以直接 hostapd -d /etc/hostapd/hostapd.conf # -d debug

0x04 啟動/停止指令碼

[email protected]:~# vi /etc/init.d/my-wifi
#! /bin/bash
#
### BEGIN INIT INFO
# Provides:          my-wifi
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Should-Start:      $network $time
# Should-Stop:       $network $time
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Start and stop the wifi ap server
# Description:       Controls the main wifi ap server
### END INIT INFO
#
case $1 in
    "start")
       sleep 1
       ifconfig wlan0 192.168.127.1 netmask 255.255.255.0
       sleep 1
       echo "1" > /proc/sys/net/ipv4/ip_forward
       sleep 1
       iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
       sleep 1
       /etc/init.d/hostapd start
       sleep 1
       /etc/init.d/dnsmasq start
    ;;
    "stop")
       /etc/init.d/dnsmasq stop
       /etc/init.d/hostapd stop
       sleep 1
       iptables -t nat -D POSTROUTING -o eth0 -j MASQUERADE
       sleep 1
       echo "0" > /proc/sys/net/ipv4/ip_forward
       sleep 1
       ifconfig wlan0 down
       sleep 1
       ifconfig wlan0 up
    ;;
    *)
       echo "Usage $0 {start|stop}"
    ;;
    esac

# 給與執行許可權
[email protected]:~# chmod +x /etc/init.d/my-wifi

# 啟動
root@zrools:~# service my-wifi start  # 或者 root@zrools:~# /etc/init.d/my-wifi start
root@zrools:~# service my-wifi stop   # 或者 root@zrools:~# /etc/init.d/my-wifi stop 

# 開機啟動
root@zrools:~# systemctl enable my-wifi
# 取消自啟
root@zrools:~# systemctl disable my-wifi

ps 可以用樹莓派架設個無線路由