lucca
80 lines
2.2 KiB
Bash
Executable File
80 lines
2.2 KiB
Bash
Executable File
#!/bin/sh
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# Local-only hotspot using Android's built-in SoftAP (wlan1)
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# SSID & password are set in Android Settings → Hotspot
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# This script only takes control of the interface afterwards
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IFACE="wlan1"
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AP_IP="192.168.43.1"
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NET="192.168.43.0/24"
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DHCP_RANGE="192.168.43.10,192.168.43.50,12h"
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[ "$(id -u)" -ne 0 ] && { echo "Need root"; exit 1; }
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echo "[*] Waiting for Android hotspot interface ($IFACE)..."
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# Give you time to turn the hotspot on
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for i in $(seq 1 15); do
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if ip link show "$IFACE" >/dev/null 2>&1; then
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echo " Found $IFACE"
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break
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fi
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sleep 1
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done
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if ! ip link show "$IFACE" >/dev/null 2>&1; then
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echo "Interface $IFACE not found."
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echo "Turn on the normal Android Wi-Fi Hotspot first, then run this script again."
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exit 1
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fi
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echo "[*] Taking control of $IFACE..."
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# Kill any existing DHCP / hostapd from Android or previous runs
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killall dnsmasq hostapd 2>/dev/null
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sleep 1
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# Disable reverse path filter
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echo 0 > /proc/sys/net/ipv4/conf/all/rp_filter
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echo 0 > /proc/sys/net/ipv4/conf/"$IFACE"/rp_filter 2>/dev/null
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# Flush old addresses and routes
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ip addr flush dev "$IFACE" 2>/dev/null
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ip route flush dev "$IFACE" 2>/dev/null
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# Assign our fixed gateway IP
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ip addr add "$AP_IP/24" broadcast 192.168.43.255 dev "$IFACE"
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ip link set "$IFACE" up
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ip route add "$NET" dev "$IFACE" src "$AP_IP" 2>/dev/null
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# Allow traffic
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iptables -I INPUT -i "$IFACE" -j ACCEPT
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iptables -I OUTPUT -o "$IFACE" -j ACCEPT
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iptables -I FORWARD -i "$IFACE" -j ACCEPT
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iptables -I FORWARD -o "$IFACE" -j ACCEPT
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# Start our own DHCP (local only – no internet)
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echo "[*] Starting local DHCP server..."
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dnsmasq \
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--interface="$IFACE" \
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--bind-interfaces \
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--dhcp-range="$DHCP_RANGE" \
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--dhcp-option=3,"$AP_IP" \
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--dhcp-option=6,"$AP_IP" \
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--port=0 \
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--no-resolv \
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--pid-file=/tmp/dnsmasq-"$IFACE".pid \
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--log-dhcp &
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sleep 2
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echo
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echo "=== Local-only Hotspot ready ==="
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echo "Interface : $IFACE"
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echo "Gateway : $AP_IP"
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echo "DHCP : 192.168.43.10 – 192.168.43.50"
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echo
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echo "SSID and password are whatever you set in Android Hotspot settings."
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echo "Connect your PC and try: ping 192.168.43.1"
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echo
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ip -4 addr show "$IFACE"
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