mirror of
https://github.com/nmap/nmap.git
synced 2025-12-14 11:49:01 +00:00
140 lines
3.3 KiB
Lua
140 lines
3.3 KiB
Lua
-- SNMP system detection script
|
|
-- rev 0.4 (6-11-2007)
|
|
|
|
id = "SNMPv1"
|
|
|
|
description = "Attempts to extract system information from SNMP service"
|
|
|
|
author = "Thomas Buchanan <tbuchanan@thecompassgrp.net>"
|
|
|
|
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
|
|
|
|
categories = {"discovery", "safe"}
|
|
|
|
require "shortport"
|
|
|
|
portrule = shortport.portnumber(161, "udp", {"open", "open|filtered"})
|
|
|
|
action = function(host, port)
|
|
|
|
-- create the socket used for our connection
|
|
local socket = nmap.new_socket()
|
|
|
|
-- set a reasonable timeout value
|
|
socket:set_timeout(5000)
|
|
|
|
-- do some exception handling / cleanup
|
|
local catch = function()
|
|
socket:close()
|
|
end
|
|
|
|
local try = nmap.new_try(catch)
|
|
|
|
-- connect to the potential SNMP system
|
|
try(socket:connect(host.ip, port.number, "udp"))
|
|
|
|
local payload
|
|
|
|
-- 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)
|
|
payload = "\048\039\002\001\000\004\006" .. "public" -- community string = public
|
|
payload = payload .. "\160\026\002\002\111\012\002\001"
|
|
payload = payload .. "\000\002\001\000\048\014\048\012"
|
|
payload = payload .. "\006\008\043\006\001\002\001\001"
|
|
payload = payload .. "\001\000\005\000"
|
|
|
|
try(socket:send(payload))
|
|
|
|
local status
|
|
local response
|
|
|
|
-- read in any response we might get
|
|
status, response = socket:receive_bytes(1)
|
|
|
|
if (not status) then
|
|
return
|
|
end
|
|
|
|
if (response == "TIMEOUT") then
|
|
return
|
|
end
|
|
|
|
-- since we got something back, the port is definitely open
|
|
nmap.set_port_state(host, port, "open")
|
|
|
|
local result
|
|
result = string.match(response, "\001\001%z\004.(.*)")
|
|
|
|
-- 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)
|
|
payload = "\048\039\002\001\000\004\006" .. "public" -- community string = public
|
|
payload = payload .. "\160\026\002\002\101\040\002\001"
|
|
payload = payload .. "\000\002\001\000\048\014\048\012"
|
|
payload = payload .. "\006\008\043\006\001\002\001\001"
|
|
payload = payload .. "\003\000\005\000"
|
|
|
|
try(socket:send(payload))
|
|
|
|
-- read in any response we might get
|
|
status, response = socket:receive_bytes(1)
|
|
|
|
if (not status) then
|
|
return result
|
|
end
|
|
|
|
if (response == "TIMEOUT") then
|
|
return result
|
|
end
|
|
|
|
try(socket:close())
|
|
|
|
local start, stop = response:find("\006\001\002\001\001\003\000")
|
|
|
|
if start == nil then
|
|
return result
|
|
end
|
|
|
|
local uplen,uptime,s1,s2,s3,s4
|
|
|
|
uplen = response:byte(stop + 2)
|
|
|
|
s1,s2,s3,s4 = response:byte(stop + 3, stop + 3 + uplen)
|
|
|
|
if uplen == 4 then
|
|
uptime = s1*(2^24) + s2*(2^16) + s3*(2^8) + s4
|
|
elseif uplen == 3 then
|
|
uptime = s1*(2^16) + s2*(2^8) + s3
|
|
elseif uplen == 2 then
|
|
uptime = s1*(2^8) + s2
|
|
elseif uplen == 1 then
|
|
uptime = s1
|
|
else
|
|
return result
|
|
end
|
|
|
|
local days, hours, minutes, seconds, htime, mtime, stime
|
|
days = math.floor(uptime / 8640000)
|
|
htime = math.fmod(uptime, 8640000)
|
|
hours = math.floor(htime / 360000)
|
|
mtime = math.fmod(htime, 360000)
|
|
minutes = math.floor(mtime / 6000)
|
|
stime = math.fmod(mtime, 6000)
|
|
seconds = stime / 100
|
|
|
|
local dayLabel
|
|
|
|
if days == 1 then
|
|
dayLabel = " day, "
|
|
else
|
|
dayLabel = " days, "
|
|
end
|
|
|
|
result = result .. "\n System uptime: " .. days .. dayLabel .. hours .. ":" .. minutes .. ":" .. seconds
|
|
result = result .. " (" .. tostring(uptime) .. " timeticks)"
|
|
|
|
return result
|
|
end
|
|
|