101 lines
3.7 KiB
Bash
Executable File
101 lines
3.7 KiB
Bash
Executable File
#!/usr/bin/env bash
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# patch_hotspot_apmode.sh
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# Make wlan0 persistent AP-mode and ensure hostapd can use it.
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# Run as root: sudo ./patch_hotspot_apmode.sh
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set -euo pipefail
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AP_IF="wlan0"
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NM_CONF="/etc/NetworkManager/conf.d/unmanaged-wlan0.conf"
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UDEV_RULE="/etc/udev/rules.d/90-wlan0-apmode.rules"
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IW_PATH="$(command -v iw || true)"
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if [ "$(id -u)" -ne 0 ]; then
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echo "Please run as root (sudo)."
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exit 2
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fi
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echo "== patch_hotspot_apmode: starting =="
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echo
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# 1) Tell NetworkManager to ignore wlan0 (idempotent)
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if [ -f "$NM_CONF" ] && grep -q "interface-name:${AP_IF}" "$NM_CONF"; then
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echo "[+] NetworkManager already configured to ignore $AP_IF ($NM_CONF)"
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else
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echo "[*] Writing NetworkManager unmanaged conf -> $NM_CONF"
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mkdir -p "$(dirname "$NM_CONF")"
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cat > "$NM_CONF" <<EOF
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[keyfile]
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unmanaged-devices=interface-name:$AP_IF
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EOF
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echo "[*] Restarting NetworkManager..."
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systemctl restart NetworkManager || true
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fi
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# 2) Create udev rule to set wlan0 to AP mode when added (idempotent)
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if [ -f "$UDEV_RULE" ] && grep -q "iw $AP_IF set type ap" "$UDEV_RULE"; then
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echo "[+] udev rule already exists -> $UDEV_RULE"
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else
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echo "[*] Writing udev rule -> $UDEV_RULE"
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cat > "$UDEV_RULE" <<EOF
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ACTION=="add", SUBSYSTEM=="net", KERNEL=="$AP_IF", RUN+="${IW_PATH:-/usr/sbin/iw} $AP_IF set type ap"
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EOF
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echo "[*] Reloading udev rules..."
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udevadm control --reload-rules || true
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udevadm trigger --action=add --subsystem-match=net || true
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fi
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# 3) Stop services/processes that may hold wlan0 right now
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echo "[*] Stopping services that might grab $AP_IF (NetworkManager, wpa_supplicant) for the moment..."
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systemctl stop NetworkManager || true
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# Try stopping wpa_supplicant systemd instance for the iface, but tolerate failure
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systemctl stop "wpa_supplicant@${AP_IF}.service" >/dev/null 2>&1 || true
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# Kill any lingering wpa_supplicant processes bound to the interface
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pkill -f "wpa_supplicant.*${AP_IF}" >/dev/null 2>&1 || true
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# 4) Force interface down -> ap mode -> up (immediate)
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if [ -z "$IW_PATH" ]; then
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echo "[!] 'iw' command not found. Please install 'iw' and re-run this script."
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exit 3
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fi
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echo "[*] Forcing $AP_IF to AP mode now..."
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ip link set "$AP_IF" down || true
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# set type ap (if already ap this is harmless)
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$IW_PATH "$AP_IF" set type ap || {
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echo "[!] Failed to set $AP_IF to AP via iw. Check driver support (iw list)."
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# continue so hostapd restart attempt still happens
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}
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ip link set "$AP_IF" up || true
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# 5) Restart hostapd + dnsmasq (so hostapd binds to AP-mode iface)
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echo "[*] Starting hostapd and dnsmasq (or restarting if already running)..."
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systemctl unmask hostapd >/dev/null 2>&1 || true
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systemctl restart hostapd || echo "[!] hostapd restart returned non-zero (check sudo journalctl -u hostapd)"
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systemctl restart dnsmasq || echo "[!] dnsmasq restart returned non-zero (check sudo journalctl -u dnsmasq)"
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# 6) Re-enable NetworkManager (but it will ignore wlan0 now)
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echo "[*] Re-enabling NetworkManager (it should ignore $AP_IF per conf)..."
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systemctl start NetworkManager || true
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# 7) Persist iptables if netfilter-persistent exists
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if command -v netfilter-persistent >/dev/null 2>&1; then
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echo "[*] Saving iptables rules via netfilter-persistent..."
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netfilter-persistent save || echo "[!] netfilter-persistent save failed (check rules)"
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else
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echo "[*] netfilter-persistent not installed; skipping iptables save."
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fi
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# 8) Final status + verification commands
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echo
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echo "== done =="
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echo "Quick checks you can run now:"
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echo " iw dev"
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echo " sudo systemctl status hostapd dnsmasq NetworkManager"
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echo " sudo journalctl -u hostapd -n 50"
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echo
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echo "If you reboot, udev will attempt to set $AP_IF to AP mode automatically and NetworkManager will ignore $AP_IF."
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echo "If anything goes wrong, paste the output of: sudo journalctl -u hostapd -n 100"
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echo
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