Enumerates SCADA Modbus slave ids (sids) and collects their device information. Modbus is one of the popular SCADA protocols. This script does Modbus device information disclosure. It tries to find legal sids (slave ids) of Modbus devices and to get additional information about the vendor and firmware. This script is improvement of modscan python utility written by Mark Bristow. Information about MODBUS protocol and security issues: * MODBUS application protocol specification: http://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b.pdf * Defcon 16 Modscan presentation: https://www.defcon.org/images/defcon-16/dc16-presentations/defcon-16-bristow.pdf * Modscan utility is hosted at google code: http://code.google.com/p/modscan/ SYNTAX: aggressive: - boolean value defines find all or just first sid