IoT CTF Aliases

iot_ctf_aliases.sh

hex2ascii() {
    tr -d "'" | xxd -r -p; printf "\n"
}

gattval() {
    cut -d":" -f2 | tr -d "'" | xxd -r -p; printf "\n"
}

gatt_read() {
    if [ $# -lt 1 ]; then
        echo "Usage: gatt_read <handle>"
        return 1
    fi
    if [ -z "$BDADDR" ]; then
        echo "Error: BDADDR environment variable is not set."
        return 1
    fi

    local handle="$1"
    
    # Write the hex value to the given handle
    gatttool -b "$BDADDR" --char-read -a "$handle" | gattval
}

gatt_write() {
    if [ $# -lt 2 ]; then
        echo "Usage: gatt_write <handle> <value>"
        return 1
    fi
    if [ -z "$BDADDR" ]; then
        echo "Error: BDADDR environment variable is not set."
        return 1
    fi

    local handle="$1"
    local value="$2"
    local hex_value

    # Convert the ASCII value to a hex string
    hex_value=$(echo -n "$value" | xxd -ps)
    
    # Write the hex value to the given handle
    gatttool -b "$BDADDR" --char-write-req -a "$handle" -n "$hex_value"
}


iotctf_scoreboard() {
    if [ -z "$BDADDR" ]; then
        echo "Error: BDADDR environment variable is not set."
        return 1
    fi

    gatt_read 0x002a
}

submit_flag() {
    if [ $# -lt 1 ]; then
        echo "Usage: submit_flag <flag>"
        return 1
    fi

    gatt_write 0x002c "$1"
}