parameterize make hotspot script

scripts/make_hotspot.sh

@@ -10,6 +10,10 @@ USER_PROMPT=false
 WRITE_CONFIG_FILES=false
 WIFI_SSID="MyLittlePony"
 WIFI_PW="AardvarkBadgerHedgehog"
+AP_IP="192.168.4.1"
+CLIENT_IP_START="192.168.4.2"
+CLIENT_IP_END="192.168.4.20"
+SUBNET_MASK="255.255.255.0"
 
 if [ "$#" == "2" ]; then
 	AP_INTERFACE="$1"
@@ -47,17 +51,18 @@ fi
 # Set dhcp and dns config files
 
 if [[ $WRITE_CONFIG_FILES == true ]]; then
+
     cp /etc/dhcpcd.conf /etc/dhcpcd.conf.orig
     cat <<EOF > /etc/dhcpcd.conf
 interface $AP_INTERFACE 
-    static ip_address=192.168.4.1/24
+    static ip_address=$AP_IP/24
     nohook wpa_supplicant
 EOF
 
     cp /etc/dnsmasq.conf /etc/dnsmasq.conf.orig
     cat <<EOF > /etc/dnsmasq.conf
 interface=$AP_INTERFACE
-dhcp-range=192.168.4.2,192.168.4.20,255.255.255.0,24h
+dhcp-range=$CLIENT_IP_START,$CLIENT_IP_END,$SUBNET_MASK,24h
 EOF
 
     cp /etc/hostapd/hostapd.conf /etc/hostapd/hostapd.conf.orig
@@ -95,7 +100,8 @@ service dnsmasq start || service dnsmasq restart
 # Connect to existing wifi
 
 ifdown $GW_INTERFACE || ifconfig $GW_INTERFACE down
-rfkill unblock wifi && rfkill unblock wlan
+rfkill unblock wifi
+rfkill unblock wlan
 sleep 3
 ifup $GW_INTERFACE || ifconfig $GW_INTERFACE up
 
@@ -104,6 +110,15 @@ ifup $GW_INTERFACE || ifconfig $GW_INTERFACE up
 ifconfig $AP_INTERFACE down
 rfkill unblock wifi
 rfkill unblock wlan
-ifconfig $AP_INTERFACE 192.168.4.1/24 up
+ifconfig $AP_INTERFACE $AP_IP/24 up
 service dhcpcd start || service dhcpcd restart
 service hostapd start || service hostapd restart
+
+# iptables
+
+iptables -t nat -F
+iptables -F
+iptables -t nat -A POSTROUTING -o $GW_INTERFACE -j MASQUERADE
+iptables -A FORWARD -i $AP_INTERFACE -o $GW_INTERFACE -j ACCEPT
+echo '1' > /proc/sys/net/ipv4/ip_forward
+service hostapd restart