Add access-point.sh

2024-07-26 21:52:58 -04:00 · 2024-07-26 21:52:58 -04:00 · 83c662d60f
commit 83c662d60f
1 changed files with 130 additions and 0 deletions
--- a/access-point.sh
+++ b/access-point.sh
@ -0,0 +1,130 @@
+#!/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