local datetime = require "datetime" local nmap = require "nmap" local shortport = require "shortport" local snmp = require "snmp" local string = require "string" description = [[ Attempts to extract system information from an SNMP service. ]] --- -- @usage -- nmap -sU -p 161 --script snmp-sysdescr -- -- @output -- | snmp-sysdescr: HP ETHERNET MULTI-ENVIRONMENT,ROM A.25.80,JETDIRECT,JD117,EEPROM V.28.22,CIDATE 08/09/2006 -- |_ System uptime: 28 days, 17:18:59 (248153900 timeticks) author = "Thomas Buchanan" license = "Same as Nmap--See https://nmap.org/book/man-legal.html" categories = {"default", "discovery", "safe"} dependencies = {"snmp-brute"} portrule = shortport.port_or_service(161, "snmp", "udp", {"open", "open|filtered"}) --- -- Sends SNMP packets to host and reads responses action = function(host, port) local snmpHelper = snmp.Helper:new(host, port) snmpHelper:connect() -- build a SNMP v1 packet -- copied from packet capture of snmpget exchange -- get value: 1.3.6.1.2.1.1.1.0 (SNMPv2-MIB::sysDescr.0) local status, response = snmpHelper:get({reqId=28428}, "1.3.6.1.2.1.1.1.0") if not status then return end -- since we got something back, the port is definitely open nmap.set_port_state(host, port, "open") local result = response and response[1] and response[1][1] -- build a SNMP v1 packet -- copied from packet capture of snmpget exchange -- get value: 1.3.6.1.2.1.1.3.0 (SNMPv2-MIB::sysUpTime.0) status, response = snmpHelper:get({reqId=28428}, "1.3.6.1.2.1.1.3.0") if not status then return result end local uptime = response and response[1] and response[1][1] if not uptime then return end result = result .. "\n" .. string.format(" System uptime: %s (%s timeticks)", datetime.format_time(uptime, 100), tostring(uptime)) return result end