Add access-point.sh

This commit is contained in:
Zakary Timson 2024-07-26 21:52:58 -04:00
commit 83c662d60f

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access-point.sh Normal file
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#!/bin/bash
# Configuration =======================================================================================================
SSID="$(hostname)" # Access point SSID name
PASSWORD="guesswhatitis" # Access point password
DHCP_IP="10.10.10.1" # Device IP on access point
DHCP_START="10.10.10.2" # Start of DHCP IP pool
DHCP_END="10.10.10.254" # End of DHCP IP pool
# End of Configuration ================================================================================================
SCRIPT="$(basename $0)"
FORCE=false
QUIET=false
show_help() {
echo "Usage: $(basename $0) [OPTIONS]"
echo ""
echo "Options:"
echo " -f, --force Create AP regardless of WiFi status"
echo " -h, --help Show this help message"
echo " -q, --quiet Run without output"
echo " --enable Enable automatic fallback AP"
echo " --disable Disable automatic fallback AP"
}
enable_ap() {
rw > /dev/null
log_message "Enabling AP..."
systemctl stop dhcpcd
systemctl stop wpa_supplicant
systemctl stop systemd-resolved
ip link set wlan0 down
ip link set wlan0 up
ip addr add "$DHCP_IP/24" dev wlan0
# Configure and start hostapd
cat <<EOF > /etc/hostapd/hostapd.conf
interface=wlan0
ssid=$SSID
hw_mode=g
channel=7
wpa=2
wpa_passphrase=$PASSWORD
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP
EOF
systemctl unmask hostapd
systemctl start hostapd
# Configure and start dnsmasq
cat <<EOF > /etc/dnsmasq.conf
interface=wlan0
dhcp-range=$DHCP_START,$DHCP_END,255.255.255.0,24h
EOF
systemctl start dnsmasq
}
disable_ap() {
log_message "Disabling AP..."
ip addr del "$DHCP_IP/24" dev wlan0
systemctl stop hostapd
systemctl stop dnsmasq
systemctl start systemd-resolved
systemctl restart dhcpcd
}
enable_cron() {
if [ -z "$(which crontab)" ]; then
echo "Error: Please install crontab"
exit 1
fi
sed -i "/$SCRIPT/d" /etc/crontab
echo "* * * * * root $(realpath $0) -q" >> /etc/crontab
echo "Automatic fallback AP enabled"
}
disable_cron() {
sed -i "/$SCRIPT/d" /etc/crontab
echo "Automatic fallback AP disabled"
}
log_message() {
if [ "$QUIET" != "true" ]; then
echo "$1"
fi
}
# Parse command line arguments
while [[ "$#" -gt 0 ]]; do
case $1 in
-f|--force) FORCE=true ;;
-h|--help) show_help && exit ;;
-q|--quiet) QUIET=true ;;
--enable) enable_cron && exit ;;
--disable) disable_cron && disable_ap && exit ;;
*)
if [ -z "$SSID" ]; then
SSID="$1"
elif [ -z "$PASSWORD" ]; then
PASSWORD="$1"
else
echo "Unknown option: $1"
show_help
exit 1
fi
;;
esac
shift
done
# Check for permissions
if [ "$UID" != "0" ]; then
echo "Error: Please run as root"
exit 1
fi
# Check if connected to WiFi
if [ "$FORCE" == "false" ] && [ -n "$(iwgetid -r)" ] ; then
log_message "Already connected to WiFi"
# Disable the access point if it's running
if [ "$(systemctl is-active hostapd)" == "active" ]; then
disable_ap
fi
elif [ "$(systemctl is-active hostapd)" != "active" ]; then
if [ "$FORCE" == "true" ]; then disable_cron; fi
enable_ap
fi