netmode/netmode at main · azph0byte/netmode · GitHub

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#!/bin/bash

# error handling func
function error_exit {
	echo "$1" >&2
	exit 1
}

function show_help {
	echo "Usage monmode {man|mon|i|w|m|-h|--help}"
	echo ""
	echo "This script allows you to switch your wireless card interface mode between:"
	echo "managed, monitor, IBSS (Ad-hoc), mesh, or WDS (Wireless Distribution System)."
	echo "If no wireless interface is specified, it will attempt to detect one automatically."
	echo "You can specify which wireless interface you want to use by modifying this script in $INTERFACE part."
	echo "Options:"
	echo "	man 		Set the interface to managed mode (normal operation)"
	echo "	mon 		Set the interface to monitor mode (package sniffing)"
	echo "	i 		Set the interface to IBSS (Ad-hoc) mode"
	echo "	m 		Set the interface to mesh mode"
	echo "	w 		Set the interface to WDS mode"
	echo "	--help | -h	Show this help message"
}

#check for su/sudo privilege
if [ "$EUID" -ne 0 ]; then
	error_exit "Error: This command must be run as a root"
fi

#detect wireless automatically (modify this if needed for specific reasons)
INTERFACE=$(iw dev | awk '$1=="Interface"{print $2}' | head -n 1 )

#check if any interface is found or not
if [ -z "$INTERFACE" ]; then
	error_exit "Error: No wirelesss interface found"
fi

#switch modes using iw command
#switch to managed
managed_mode() {
	echo "Switch to managed/normal mode on $INTERFACE..."
	if ! ip link show "$INTERFACE" > /dev/null 2>&1; then
		error_exit "Error: Interface $INTERFACE does not exist."
	fi
	sudo ip link set "$INTERFACE" down || error_exit "Failed to bring down $INTERFACE."
	sudo iw dev "$INTERFACE" set type managed || error_exit "Failed to set $INTERFACE to managed mode."
	sudo ip link set "$INTERFACE" up || error_exit "Failed to bring up $INTERFACE."

	echo "Successfuly switch to managed mode on $INTERFACE."
}

#switch to monitor
monitor_mode() {
	echo "Switch to monitor mode on $INTERFACE..."
	if ! ip link show "$INTERFACE" > /dev/null 2>&1; then
		error_exit "Error: Interface $INTERFACE does not exist."
	fi
	sudo ip link set "$INTERFACE" down || error_exit "Failed to bring down $INTERFACE."
	sudo iw dev "$INTERFACE" set type monitor || error_exit "Failed to set $INTERFACE to monitor mode."
	sudo ip link set "$INTERFACE" up || error_exit "Failed to bring up $INTERFACE."

	echo "Successfuly switch to monitor on $INTERFACE."
}

#switch to ibss
ibss_mode() {
	echo "Switch to ibss mode on $INTERFACE..."
	if ! ip link show "$INTERFACE" > /dev/null 2>&1; then
		error_exit "Error: Interface $INTERFACE does not exist."
	fi
	sudo ip link set "$INTERFACE" down || error_exit "Failed to bring down $INTERFACE."
	sudo iw dev "$INTERFACE" set type ibss || error_exit "Failed to set $INTERFACE to ibss mode."
	sudo ip link set "$INTERFACE" up || error_exit "Failed to bring up $INTERFACE."

	echo "Successfuly switch to ibss mode on $INTERFACE."
}

#switch to monitor
mesh_mode() {
	echo "Switch to mesh mode on $INTERFACE..."
	if ! ip link show "$INTERFACE" > /dev/null 2>&1; then
		error_exit "Error: Interface $INTERFACE does not exist."
	fi
	sudo ip link set "$INTERFACE" down || error_exit "Failed to bring down $INTERFACE."
	sudo iw dev "$INTERFACE" set type mesh || error_exit "Failed to set $INTERFACE to mesh mode."
	sudo ip link set "$INTERFACE" up || error_exit "Failed to bring up $INTERFACE."

	echo "Successfuly switch to mesh mode on $INTERFACE."
}

#switch to monitor
wds_mode() {
	echo "Switch to wds mode on $INTERFACE..."
	if ! ip link show "$INTERFACE" > /dev/null 2>&1; then
		error_exit "Error: Interface $INTERFACE does not exist."
	fi
	sudo ip link set "$INTERFACE" down || error_exit "Failed to bring down $INTERFACE."
	sudo iw dev "$INTERFACE" set type wds || error_exit "Failed to set $INTERFACE to wds mode."
	sudo ip link set "$INTERFACE" up || error_exit "Failed to bring up $INTERFACE."

	echo "Successfuly switch to wds mode on $INTERFACE."
}
#control flow

case "$1" in
	man)
		managed_mode
		;;
	mon)
		monitor_mode
		;;
	i)
		ibss_mode
		;;
	m)
		mesh_mode
		;;
	w)
		wds_mode
		;;
	--help|-h)
		show_help
		;;
	*)
		error_exit "Invalid argument. -h or --help for usage information."
		;;
esac