树莓派4B配置wifi热点，可访问http协议

首先需要更换源

1、备份sources.list
sudo mv /etc/apt/sources.list /etc/apt/sources.list.bak
sudo touch /etc/apt/sources.list
2、将下面的代码写入sources.list文件中
sudo echo "deb http://mirrors.aliyun.com/raspbian/raspbian/ buster main contrib non-free rpi" | sudo tee -a /etc/apt/sources.list
sudo echo "deb-src http://mirrors.aliyun.com/raspbian/raspbian/ buster main contrib non-free rpi" | sudo tee -a /etc/apt/sources.list
3、备份raspi.list文件
sudo mv /etc/apt/sources.list.d/raspi.list /etc/apt/sources.list.d/raspi.list.bak
sudo touch /etc/apt/sources.list.d/raspi.list
sudo echo "deb http://mirrors.aliyun.com/raspbian/raspbian/ buster main contrib non-free rpi" | sudo tee -a /etc/apt/sources.list.d/raspi.list
sudo echo "deb-src http://mirrors.aliyun.com/raspbian/raspbian/ buster main contrib non-free rpi" | sudo tee -a /etc/apt/sources.list.d/raspi.list

一、安装必要的软件包

sudo apt install hostapd dnsmasq -y && sudo systemctl stop hostapd && sudo systemctl stop dnsmasq

二、配置网络接口

sudo echo "interface wlan0" >> /etc/dhcpcd.conf && sudo echo "static ip_address=192.168.4.1/24" >> /etc/dhcpcd.conf && sudo echo "nohook wpa_supplicant" >> /etc/dhcpcd.conf

sudo systemctl restart dhcpcd

三、配置dhcp和dns服务

sudo mv /etc/dnsmasq.conf /etc/dnsmasq.conf.back && sudo touch /etc/dnsmasq.conf
sudo echo "interface=wlan0" | sudo tee -a /etc/dnsmasq.conf && sudo echo "dhcp-range=192.168.4.2,192.168.4.100,255.255.255.0,24h" | sudo tee -a /etc/dnsmasq.conf && sudo echo "dhcp-option=3,192.168.4.1" | sudo tee -a /etc/dnsmasq.conf && sudo echo "dhcp-option=6,8.8.8.8" | sudo tee -a /etc/dnsmasq.conf && sudo echo "server=8.8.8.8" | sudo tee -a /etc/dnsmasq.conf && sudo echo "log-queries" | sudo tee -a /etc/dnsmasq.conf && sudo echo "log-dhcp" | sudo tee -a /etc/dnsmasq.conf 

四、配置wifi热点(先判断文件是否存在)

sudo touch /etc/hostapd/hostapd.conf
sudo echo "country_code=CN" | sudo tee -a /etc/hostapd/hostapd.conf && sudo echo "interface=wlan0" | sudo tee -a /etc/hostapd/hostapd.conf && sudo echo "ssid=zhiRaspbeery" | sudo tee -a /etc/hostapd/hostapd.conf && sudo echo "hw_mode=g" | sudo tee -a /etc/hostapd/hostapd.conf && sudo echo "channel=6" | sudo tee -a /etc/hostapd/hostapd.conf && sudo echo "macaddr_acl=0" | sudo tee -a /etc/hostapd/hostapd.conf && sudo echo "auth_algs=1" | sudo tee -a /etc/hostapd/hostapd.conf && sudo echo "ignore_broadcast_ssid=0" | sudo tee -a /etc/hostapd/hostapd.conf && sudo echo "wpa=2" | sudo tee -a /etc/hostapd/hostapd.conf && sudo echo "wpa_passphrase=12345678" | sudo tee -a /etc/hostapd/hostapd.conf && sudo echo "wpa_key_mgmt=WPA-PSK" | sudo tee -a /etc/hostapd/hostapd.conf && sudo echo "wpa_pairwise=TKIP" | sudo tee -a /etc/hostapd/hostapd.conf && sudo echo "rsn_pairwise=CCMP" | sudo tee -a /etc/hostapd/hostapd.conf 

echo "DAEMON_CONF=\"/etc/hostapd/hostapd.conf\"" | sudo tee -a /etc/default/hostapd # 将上面的文件挂在到hostapd文件中

sudo systemctl unmask hostapd && sudo rfkill list && sudo rfkill unblock wlan && sudo systemctl restart networking && sudo systemctl restart hostapd

五、启用IP转发和防火墙规则

1、启用IP转发（将wifi网卡指向有线网卡）

sudo echo "net.ipv4.ip_forward=1" | sudo tee -a /etc/sysctl.conf
sudo sysctl -p

2、防火墙规则

sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
sudo iptables -A FORWARD -i eth0 -o wlan0 -m state --state RELATED,ESTABLISHED -j ACCEPT
sudo iptables -A FORWARD -i wlan0 -o eth0 -j ACCEPT
sudo sh -c "iptables-save > /etc/iptables.ipv4.nat"
# 编辑 /etc/rc.local 文件，在 exit 0 之前添加以下行，以在系统启动时恢复防火墙规则：
sudo echo "iptables-restore < /etc/iptables.ipv4.nat" | sudo tee -a /etc/rc.local

六、启动

sudo systemctl start hostapd
sudo systemctl start dnsmasq
sudo systemctl enable hostapd
sudo systemctl enable dnsmasq