local bin = require "bin" local ipOps = require "ipOps" local nmap = require "nmap" local stdnse = require "stdnse" local tab = require "tab" local table = require "table" description=[[ Discovers hosts and routing information from devices running RIPv2 on the LAN. It does so by sending a RIPv2 Request command and collects the responses from all devices responding to the request. ]] --- -- @usage -- nmap --script broadcast-rip-discover -- -- @output -- Pre-scan script results: -- | broadcast-rip-discover: -- | Discovered RIPv2 devices -- | 10.0.200.107 -- | ip netmask nexthop metric -- | 10.46.100.0 255.255.255.0 0.0.0.0 1 -- | 10.46.110.0 255.255.255.0 0.0.0.0 1 -- | 10.46.120.0 255.255.255.0 0.0.0.0 1 -- | 10.46.123.0 255.255.255.0 10.0.200.123 1 -- | 10.46.124.0 255.255.255.0 10.0.200.124 1 -- | 10.46.125.0 255.255.255.0 10.0.200.125 1 -- | 10.0.200.101 -- | ip netmask nexthop metric -- |_ 0.0.0.0 0.0.0.0 10.0.200.1 1 -- -- @args broadcast-rip-discover.timeout timespec defining how long to wait for -- a response. (default 5s) -- -- Version 0.1 -- Created 29/10/2011 - v0.1 - created by Patrik Karlsson -- author = "Patrik Karlsson" license = "Same as Nmap--See https://nmap.org/book/man-legal.html" categories = {"broadcast", "safe"} prerule = function() return not( nmap.address_family() == "inet6") end RIPv2 = { Command = { Request = 1, Response = 2, }, AddressFamily = { IP = 2, }, -- The Request class contains functions to build a RIPv2 Request Request = { -- Creates a new Request instance -- -- @param command number containing the RIPv2 Command to use -- @return o instance of request new = function(self, command) local o = { version = 2, command = command, domain = 0, family = 0, tag = 0, address = 0, subnet = 0, nexthop = 0, metric = 16 } setmetatable(o, self) self.__index = self return o end, -- Converts the whole request to a string __tostring = function(self) assert(self.command, "No command was supplied") assert(self.metric, "No metric was supplied") assert(self.address, "No address was supplied") local RESERVED = 0 -- RIPv2 stuff, should be 0 for RIPv1 local tag, subnet, nexthop = 0, 0, 0 local data = bin.pack(">CCSSSIIII", self.command, self.version, self.domain, self.family, self.tag, self.address, self.subnet, self.nexthop, self.metric) return data end, }, -- The Response class contains code needed to parse a RIPv2 response Response = { -- Creates a new Response instance based on raw socket data -- -- @param data string containing the raw socket response -- @return o Response instance new = function(self, data) local o = { data = data } if ( not(data) or #data < 3 ) then return end local pos pos, o.command, o.version = bin.unpack(">CCS", data) if ( o.command ~= RIPv2 and o.version ~= 2 ) then return end local routes = tab.new(2) tab.addrow(routes, "ip", "netmask", "nexthop", "metric") while( #data - pos >= 20 ) do local family, address, metric, _, netmask, nexthop pos, family, _, address, netmask, nexthop, metric = bin.unpack(">SSI", data, pos) if ( family == RIPv2.AddressFamily.IP ) then local ip = ipOps.fromdword(address) netmask = ipOps.fromdword(netmask) nexthop = ipOps.fromdword(nexthop) tab.addrow(routes, ip, netmask, nexthop, metric) end end if ( #routes > 1 ) then o.routes = routes end setmetatable(o, self) self.__index = self return o end, } } action = function() local timeout = stdnse.parse_timespec(stdnse.get_script_args('broadcast-rip-discover.timeout')) timeout = (timeout or 5) * 1000 local socket = nmap.new_socket("udp") socket:set_timeout(timeout) local rip = RIPv2.Request:new(RIPv2.Command.Request) local status, err = socket:sendto("224.0.0.9", { number = 520, protocol = "udp" }, tostring(rip)) local result = {} repeat local data status, data = socket:receive() if ( status ) then local status, _, _, rhost, _ = socket:get_info() local response = RIPv2.Response:new(data) table.insert(result, rhost) if ( response and response.routes and #response.routes > 0 ) then --response.routes.name = "Routes" table.insert(result, { tab.dump(response.routes) } ) end end until( not(status) ) if ( #result > 0 ) then result.name = "Discovered RIPv2 devices" end return stdnse.format_output(true, result) end