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119 lines
2.9 KiB
Lua
119 lines
2.9 KiB
Lua
local math = require "math"
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local nmap = require "nmap"
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local shortport = require "shortport"
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local snmp = require "snmp"
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local string = require "string"
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description = [[
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Attempts to extract system information from an SNMP version 1 service.
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]]
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---
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-- @usage
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-- nmap -sU -p 161 --script snmp-sysdescr <target>
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--
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-- @output
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-- | snmp-sysdescr: HP ETHERNET MULTI-ENVIRONMENT,ROM A.25.80,JETDIRECT,JD117,EEPROM V.28.22,CIDATE 08/09/2006
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-- |_ System uptime: 28 days, 17:18:59 (248153900 timeticks)
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author = "Thomas Buchanan"
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license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
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categories = {"default", "discovery", "safe"}
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dependencies = {"snmp-brute"}
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portrule = shortport.portnumber(161, "udp", {"open", "open|filtered"})
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---
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-- Sends SNMP packets to host and reads responses
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action = function(host, port)
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-- create the socket used for our connection
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local socket = nmap.new_socket()
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-- set a reasonable timeout value
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socket:set_timeout(5000)
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-- do some exception handling / cleanup
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local catch = function()
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socket:close()
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end
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local try = nmap.new_try(catch)
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-- connect to the potential SNMP system
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try(socket:connect(host, port))
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local payload
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-- build a SNMP v1 packet
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-- copied from packet capture of snmpget exchange
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-- get value: 1.3.6.1.2.1.1.1.0 (SNMPv2-MIB::sysDescr.0)
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local options = {}
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options.reqId = 28428 -- unnecessary?
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payload = snmp.encode(snmp.buildPacket(snmp.buildGetRequest(options, "1.3.6.1.2.1.1.1.0")))
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try(socket:send(payload))
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local status
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local response
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-- read in any response we might get
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status, response = socket:receive_bytes(1)
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if (not status) or (response == "TIMEOUT") then
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return
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end
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-- since we got something back, the port is definitely open
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nmap.set_port_state(host, port, "open")
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local result
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result = snmp.fetchFirst(response)
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-- build a SNMP v1 packet
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-- copied from packet capture of snmpget exchange
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-- get value: 1.3.6.1.2.1.1.3.0 (SNMPv2-MIB::sysUpTime.0)
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local options = {}
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options.reqId = 28428
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payload = snmp.encode(snmp.buildPacket(snmp.buildGetRequest(options, "1.3.6.1.2.1.1.3.0")))
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try(socket:send(payload))
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-- read in any response we might get
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status, response = socket:receive_bytes(1)
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if (not status) or (response == "TIMEOUT") then
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return result
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end
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try(socket:close())
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local uptime = snmp.fetchFirst(response)
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local days, hours, minutes, seconds, htime, mtime, stime
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days = math.floor(uptime / 8640000)
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htime = math.fmod(uptime, 8640000)
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hours = math.floor(htime / 360000)
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mtime = math.fmod(htime, 360000)
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minutes = math.floor(mtime / 6000)
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stime = math.fmod(mtime, 6000)
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seconds = stime / 100
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local dayLabel
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if days == 1 then
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dayLabel = "day"
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else
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dayLabel = "days"
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end
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result = result .. "\n" .. string.format(" System uptime: %d %s, %d:%02d:%05.2f (%s timeticks)", days, dayLabel, hours, minutes, seconds, tostring(uptime))
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return result
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end
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