install-autoAP

#!/bin/bash
#
# Installs autoAP (Automatic Access Point if no WiFi connection)
#

function askyn() {
    local ans
    echo -n "$1" '[y/n]? ' ; read $2 ans
    case "$ans" in
        y*|Y*) return 0 ;;
        *) return 1 ;;
    esac
}

fdhcpcd=1
echo ""
echo "Install autoAP into the current running system"
if [ "$(systemctl is-active systemd-networkd)" != "active" ]
then
    echo ""
    echo "? This system is not configured to use systemd-networkd"
    echo "  You must switch to using systemd-networkd to use autoAP"
    echo "  You can use /usr/local/bin/rpi-networkconfig to reconfigure your networking"
    echo "  rpi-networkconfig will configure wlan0 and eth0 to be DHCP-enabled"
    echo "  This can be done after install-autoAP has completed."
    echo ""
    if ! askyn "Do you want to continue with autoAP installation"
    then
	exit
    fi
    fdhcpcd=0
fi

echo ""
echo -n "SSID for Access Point mode: "
apssid=$(read ans; echo $ans)
echo -n "Password for Access Point mode: "
appsk=$(read ans; echo $ans)
echo -n "IPV4 address for Access Point mode [192.168.16.1]: "
apip=$(read ans; echo $ans)
[ "$apip" == "" ] && apip="192.168.16.1"
apssid="${apssid//\"/}"   # Remove double quotes from SSID and password
appsk="${appsk//\"/}" 
#
# Get existing WiFi configuration
#
wpafn="/etc/wpa_supplicant/wpa_supplicant.conf"
[ ! -f "$wpafn" -a -f "/etc/wpa_supplicant/wpa_supplicant-wlan0.conf" ] && wpafn="/etc/wpa_supplicant/wpa_supplicant-wlan0.conf"
if [ -f "$wpafn" ]
then
    country=$(grep country= $wpafn | (IFS='='; read a b ; echo $b))
    ssid=$(grep ssid= $wpafn | (IFS='='; read a b ; echo $b))
    psk=$(grep psk= $wpafn | (IFS='='; read a b ; echo $b))
fi
if [ "$country" == "" -o "$ssid" == "" -o "$psk" == "" ]
then
    echo ""
    echo "% No appropriate wpa_supplicant configuration found, please provide..."
    echo ""
    echo -n "Your Country [US]: "
    country=$(read ans; echo $ans)
    [ "$country" == "" ] && country="US"
    echo -n "Your WiFi SSID: "
    ssid=$(read ans; echo $ans)
    echo -n "Your WiFi password: "
    psk=$(read ans; echo $ans)
fi
ssid="${ssid//\"/}"    # Remove double quotes
psk="${psk//\"/}"
echo ""
echo "        autoAP Configuration"
echo " Access Point SSID:     $apssid"
echo " Access Point password: $appsk"
echo " Access Point IP addr:  $apip"
echo " Your WiFi country:     $country"
echo " Your WiFi SSID:        $ssid"
echo " Your WiFi password:    $psk"
echo ""
if ! askyn "Are you ready to proceed"
then
    echo ""
    echo "% No changes have been made to your system"
    exit 0
fi

echo ""
echo "Renaming $wpafn"
echo " to ${wpafn}-orig to avoid future confusion..."
[ -f ${wpafn}-orig ] && rm -f ${wpafn}-orig.bak && mv ${wpafn}-orig ${wpafn}-orig.bak
mv $wpafn ${wpafn}-orig
wpafn="/etc/wpa_supplicant/wpa_supplicant-wlan0.conf"   # Always write to this config file
echo ""
echo "Creating $wpafn..."
cat > $wpafn <<EOF
country=$country
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
ap_scan=1

network={
    priority=10
    ssid="$ssid"
    psk="$psk"
}

### autoAP access point ###
network={
    ssid="$apssid"
    mode=2
    key_mgmt=WPA-PSK
    psk="$appsk"
    frequency=2462
}
EOF

echo ""
echo "Creating WiFi network files in /etc/systemd/network..."
[ -f /etc/systemd/network/11-wlan0.network ] && mv /etc/systemd/network/11-wlan0.network /etc/systemd/network/.11-wlan0.network.bak
[ -f /etc/systemd/network/11-wlan0.network~ ] && rm -f /etc/systemd/network/11-wlan0.network~
cat > /etc/systemd/network/11-wlan0.network <<EOF
[Match]
Name=wlan0

[Network]
DHCP=ipv4

[DHCP]
RouteMetric=20
UseDomains=yes

EOF
[ -f /etc/systemd/network/12-wlan0AP.network ] && mv /etc/systemd/network/12-wlan0AP.network /etc/systemd/network/.12-wlan0AP.network.bak
cat > /etc/systemd/network/12-wlan0AP.network <<EOF
[Match]
Name=wlan0

[Network]
DHCPServer=yes
Address=$apip/24

EOF

echo ""
echo "Creating /etc/systemd/system/wpa-autoap@wlan0.service configuration file..."
[ -f /etc/systemd/network/wpa-autoap@wlan0.service ] && mv /etc/systemd/network/wpa-autoap@wlan0.service /etc/systemd/network/.wpa-autoap@wlan0.service.bak
cat > /etc/systemd/system/wpa-autoap@wlan0.service <<EOF
[Unit]
Description=autoAP Automatic Access Point When No WiFi Connection (wpa-autoap@wlan0.service)
#After=network.target network-online.target wpa_supplicant@%i.service sys-subsystem-net-devices-%i.device
Before=wpa_supplicant@%i.service
BindsTo=wpa_supplicant@%i.service

[Service]
Type=simple
ExecStart=/usr/local/bin/autoAP.sh start %I
Restart=on-failure
TimeoutSec=1

[Install]
WantedBy=multi-user.target

EOF
#
# set up wpa-autoap-restore service
# Needed in the case that
#      * 11-wlan0.network is in the disabled state (there is a client connected)
#      * wpa-autoap@wlan0 service is not enabled at reboot
#      * system reboots
#      * 11-wlan0.network still in the disabled state, so no WiFi connection
# This service should always be enabled. VERY low cost!
#
echo "Creating /etc/systemd/system/wpa-autoap-restore.service configuration file..."
[ -f /etc/systemd/system/wpa-autoap-restore.service ] && mv -f /etc/systemd/system/wpa-autoap-restore.service /etc/systemd/system/wpa-autoap-restore.service.bak
cat > /etc/systemd/system/wpa-autoap-restore.service <<EOF
[Unit]
Description=Restore wpa-autoap configuration (wpa-autoap-restore.service)
DefaultDependencies=no
After=local-fs-pre.target

[Service]
Type=oneshot
ExecStart=/bin/bash -c '[ -x /usr/local/bin/autoAP.sh ] && /usr/local/bin/autoAP.sh reset'

[Install]
WantedBy=multi-user.target

EOF
systemctl enable wpa-autoap-restore

echo ""
echo "Creating /usr/local/bin/autoAP-local.sh..."
[ -f /usr/local/bin/autoAP-local.sh ] && mv /usr/local/bin/autoAP-local.sh /usr/local/bin/autoAP-local.sh.bak
cat > /usr/local/bin/autoAP-local.sh <<EOF
#!/bin/bash
# \$1 has either "Client" or "AccessPoint"

logmsg () {
    [ \$debug -eq 0 ] && logger --id=\$\$ "\$1"
}

[ -f /usr/local/bin/autoAP.conf ] && source /usr/local/bin/autoAP.conf || debug=0

case "\$1" in
    Client)
          logmsg "/usr/local/bin/autoAP-local: Client"
	  ## Add your code here that runs when the Client WiFi is enabled
	  ;;
    AccessPoint)
          logmsg "/usr/local/bin/autoAP-local: Access Point"
	  ## Add your code here that runs when the Access Point is enabled
	  ;;
esac
EOF
chmod 755 /usr/local/bin/autoAP-local.sh

echo ""
systemctl daemon-reload
echo "Modifying WPA services..."
echo "Enabling wpa_supplicant@wlan0..."
systemctl enable wpa_supplicant@wlan0
echo "Disabling (vanilla) wpa_supplicant..."
systemctl disable wpa_supplicant
echo ""
echo "Enabling wpa-autoap@wlan0 service"
echo "If you don't want it to be enabled, do: sudo systemctl disable wpa-autoap@wlan0"
systemctl enable wpa-autoap@wlan0

echo ""
echo "Creating /usr/local/bin/autoAP.conf..."
[ -f /usr/local/bin/autoAP.conf ] && mv /usr/local/bin/autoAP.conf /usr/local/bin/autoAP.conf.bak
cat > /usr/local/bin/autoAP.conf <<EOF
#
# enablewait
#  In AP mode, number of seconds to wait before retrying regular WiFi connection
#
enablewait=300
#
# disconnectwait
#  number of seconds to wait after last AP client disconnects before retrying regular WiFi connection
#
disconnectwait=20
#
# debug logging
#  0:debug logging on
#  1:debug logging off
#
debug=0
EOF

echo ""
echo "% Review the settings in /usr/local/bin/autoAP.conf"
if [ $fdhcpcd -eq 0 ]
then
    echo ""
    echo "** Reminder: Your system must use systemd-networkd to work with autoAP"
    echo "             Look at /usr/local/bin/rpi-networkconfig"
    echo "             Do this before rebooting your system"
    echo ""
fi
echo ""
echo "autoAP installation complete"
echo "Please reboot the system for the configuration changes to take effect"