rpi_3_bplus_wifiapclientbridge_configure.sh

sudo apt-get update && sudo apt-get install -y hostapd dnsmasq iptables-persistent

export DEBIAN_FRONTEND=noninteractive
export ID=$(cat /sys/class/net/wlan0/address | sed 's/://g')
export AP_NAME=AP_$(date +%s)
export AP_PASS=raspberry
export WIFI_NAME=wifi_name
export WIFI_PASS=wifi_password

sudo bash -c 'cat > /etc/network/interfaces.d/ap' << EOF
allow-hotplug uap0
auto uap0
iface uap0 inet static
    address 10.3.141.1
    netmask 255.255.255.0
EOF

sudo bash -c 'cat > /etc/udev/rules.d/90-wireless.rules' << EOF
ACTION=="add", SUBSYSTEM=="ieee80211", KERNEL=="phy0", \
    RUN+="/sbin/iw phy %k interface add uap0 type __ap"
EOF

sudo bash -c 'cat > /lib/dhcpcd/dhcpcd-hooks/10-wpa_supplicant' << 'EOF'
if [ -z "$wpa_supplicant_conf" ]; then
    for x in \
        /etc/wpa_supplicant/wpa_supplicant-"$interface".conf \
        /etc/wpa_supplicant/wpa_supplicant.conf \
        /etc/wpa_supplicant-"$interface".conf \
        /etc/wpa_supplicant.conf \
    ; do
        if [ -s "$x" ]; then
            wpa_supplicant_conf="$x"
            break
        fi
    done
fi
: ${wpa_supplicant_conf:=/etc/wpa_supplicant.conf}

if [ "$ifwireless" = "1" ] && \
    type wpa_supplicant >/dev/null 2>&1 && \
    type wpa_cli >/dev/null 2>&1
then
    if [ "$reason" = "IPV4LL" ]; then
        wpa_supplicant -B -iwlan0 -f/var/log/wpa_supplicant.log -c/etc/wpa_supplicant/wpa_supplicant.conf
    fi
fi
EOF

sudo bash -c 'cat > /etc/wpa_supplicant/wpa_supplicant.conf' << EOF
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
country=US

network={
    ssid="${WIFI_NAME}"
    psk="${WIFI_PASS}"
    key_mgmt=WPA-PSK
}
EOF

sudo bash -c 'cat > /etc/dnsmasq.conf' << EOF
interface=lo,uap0
no-dhcp-interface=lo,wlan0
bind-interfaces
server=8.8.8.8
dhcp-range=10.3.141.50,10.3.141.255,12h
EOF

sudo bash -c 'cat > /etc/hostapd/hostapd.conf' << EOF
interface=uap0
ssid=${AP_NAME}
hw_mode=g
channel=6
macaddr_acl=0
auth_algs=1
ignore_broadcast_ssid=0
wpa=2
wpa_passphrase=${AP_PASS}
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP
EOF

sudo bash -c 'cat > /etc/default/hostapd' << EOF
DAEMON_CONF="/etc/hostapd/hostapd.conf"
EOF

sudo bash -c 'echo "net.ipv4.ip_forward=1" >> /etc/sysctl.conf'
sudo bash -c 'echo 1 > /proc/sys/net/ipv4/ip_forward'
sudo bash -c 'iptables -t nat -A POSTROUTING -s 10.3.141.0/24 ! -d 10.3.141.0/24 -j MASQUERADE'
sudo bash -c 'iptables-save > /etc/iptables/rules.v4'