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local http = require "http"
local io = require "io"
local ipOps = require "ipOps"
local stdnse = require "stdnse"
local string = require "string"
local stringaux = require "stringaux"
local table = require "table"
local target = require "target"
description = [[
Discovers hostnames that resolve to the target's IP address by querying the online database at http://www.bfk.de/bfk_dnslogger.html.
The script is in the "external" category because it sends target IPs to a third party in order to query their database.
This script was formerly (until April 2012) known as hostmap.nse.
]]
---
-- @args hostmap-bfk.prefix If set, saves the output for each host in a file
-- called "<prefix><target>". The file contains one entry per line.
-- @args newtargets If set, add the new hostnames to the scanning queue.
-- This the names presumably resolve to the same IP address as the
-- original target, this is only useful for services such as HTTP that
-- can change their behavior based on hostname.
--
-- @usage
-- nmap --script hostmap-bfk --script-args hostmap-bfk.prefix=hostmap- <targets>
--
-- @output
-- Host script results:
-- | hostmap-bfk:
-- | hosts:
-- | insecure.org
-- | 173.255.243.189
-- | images.insecure.org
-- | www.insecure.org
-- | nmap.org
-- | 189.243.255.173.in-addr.arpa
-- | mail.nmap.org
-- | svn.nmap.org
-- | www.nmap.org
-- | sectools.org
-- | seclists.org
-- |_ li253-189.members.linode.com
--
-- @xmloutput
-- <table key="hosts">
-- <elem>insecure.org</elem>
-- <elem>173.255.243.189</elem>
-- <elem>images.insecure.org</elem>
-- <elem>www.insecure.org</elem>
-- <elem>nmap.org</elem>
-- <elem>189.243.255.173.in-addr.arpa</elem>
-- <elem>mail.nmap.org</elem>
-- <elem>svn.nmap.org</elem>
-- <elem>www.nmap.org</elem>
-- <elem>sectools.org</elem>
-- <elem>seclists.org</elem>
-- <elem>li253-189.members.linode.com</elem>
-- </table>
---
author = "Ange Gutek"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"external", "discovery"}
local HOSTMAP_SERVER = "www.bfk.de"
local write_file
hostrule = function(host)
return not ipOps.isPrivate(host.ip)
end
action = function(host)
local query = "/bfk_dnslogger.html?query=" .. host.ip
local response
local output_tab = stdnse.output_table()
response = http.get(HOSTMAP_SERVER, 80, query, {any_af=true})
if not response.status then
stdnse.debug1("Error: could not GET http://%s%s", HOSTMAP_SERVER, query)
return nil
end
local hostnames = {}
local hosts_log = {}
for entry in string.gmatch(response.body, "#result\" rel=\"nofollow\">(.-)</a></tt>") do
if not hostnames[entry] then
if target.ALLOW_NEW_TARGETS then
local status, err = target.add(entry)
end
hostnames[entry] = true
hosts_log[#hosts_log + 1] = entry
end
end
if #hosts_log == 0 then
if not string.find(response.body, "<p>The server returned no hits.</p>") then
stdnse.debug1("Error: found no hostnames but not the marker for \"no hostnames found\" (pattern error?)")
end
return nil
end
output_tab.hosts = hosts_log
local hostnames_str = table.concat(hostnames, "\n")
local filename_prefix = stdnse.get_script_args("hostmap-bfk.prefix")
if filename_prefix then
local filename = filename_prefix .. stringaux.filename_escape(host.targetname or host.ip)
local status, err = write_file(filename, hostnames_str .. "\n")
if status then
output_tab.filename = filename
else
stdnse.debug1("Error saving to %s: %s\n", filename, err)
end
end
return output_tab
end
function write_file(filename, contents)
local f, err = io.open(filename, "w")
if not f then
return f, err
end
f:write(contents)
f:close()
return true
end
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