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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 <target>
--
-- @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
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