mirror of
https://github.com/nmap/nmap.git
synced 2025-12-09 06:01:28 +00:00
142 lines
4.4 KiB
Lua
142 lines
4.4 KiB
Lua
-- -*- mode: lua -*-:
|
|
-- vim: set filetype=lua :
|
|
|
|
description = [[
|
|
Sniffs the local network for a configurable amount of time (10 seconds
|
|
by default) and prints discovered addresses. If the
|
|
<code>newtargets</code> script argument is set, discovered addresses
|
|
are added to the scan queue.
|
|
|
|
Requires root privileges. Either the <code>targets-sniffer.iface</code> script
|
|
argument or <code>-e</code> Nmap option to define which interface to use.
|
|
]]
|
|
|
|
---
|
|
-- @usage
|
|
-- nmap -sL --script=targets-sniffer --script-args=newtargets,targets-sniffer.timeout=5s,targets-sniffer.iface=eth0
|
|
-- @args targets-sniffer.timeout The amount of time to listen for packets. Default <code>10s</code>.
|
|
-- @args targets-sniffer.iface The interface to use for sniffing.
|
|
-- @args newtargets If true, add discovered targets to the scan queue.
|
|
-- @output
|
|
-- Pre-scan script results:
|
|
-- | targets-sniffer:
|
|
-- | 192.168.0.1
|
|
-- | 192.168.0.3
|
|
-- | 192.168.0.35
|
|
-- |_192.168.0.100
|
|
|
|
|
|
-- Thanks to everyone for the feedback and especially Henri Doreau for his detailed feedback and suggestions
|
|
|
|
author = "Nick Nikolaou"
|
|
categories = {"broadcast", "discovery", "safe"}
|
|
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
|
|
|
|
require("stdnse")
|
|
require("target")
|
|
require("nmap")
|
|
require("packet")
|
|
require("bin")
|
|
|
|
local interface_info
|
|
local all_addresses= {}
|
|
local unique_addresses = {}
|
|
|
|
--Make sure the IP is not a broadcast or the local address
|
|
local function check_if_valid(address)
|
|
local broadcast = interface_info.broadcast
|
|
local local_address = interface_info.address
|
|
|
|
if address == local_address or address == broadcast or address == "255.255.255.255" then
|
|
return false
|
|
else
|
|
return true end
|
|
end
|
|
|
|
local function get_ip_addresses(layer3)
|
|
local ip = packet.Packet:new(layer3, layer3:len())
|
|
return packet.toip(ip.ip_bin_src),packet.toip(ip.ip_bin_dst)
|
|
end
|
|
|
|
prerule = function()
|
|
return nmap.is_privileged() and
|
|
(stdnse.get_script_args("targets-sniffer.iface") or nmap.get_interface())
|
|
end
|
|
|
|
|
|
action = function()
|
|
|
|
local sock = nmap.new_socket()
|
|
local ip_src,ip_dst
|
|
local packet_counter = 0
|
|
local ip_counter = 0
|
|
local DEFAULT_TIMEOUT_SEC = 10 -- Default timeout value in seconds if the timeout argument is not specified
|
|
local timeoutstr = stdnse.get_script_args("targets-sniffer.timeout") or tostring(DEFAULT_TIMEOUT_SEC)
|
|
local timeout = (stdnse.parse_timespec(timeoutstr) * 1000)
|
|
local interface = stdnse.get_script_args("targets-sniffer.iface") or nmap.get_interface()
|
|
interface_info = nmap.get_interface_info(interface)
|
|
|
|
if interface_info==nil then -- Check if we have the interface information
|
|
stdnse.print_debug(1,"Error: Unable to get interface info. Did you specify the correct interface using 'targets-sniffer.iface=<interface>' or '-e <interface>'?")
|
|
return
|
|
end
|
|
|
|
|
|
if sock==nil then
|
|
stdnse.print_debug(1,"Error - unable to open socket using interface %s",interface)
|
|
return
|
|
else
|
|
sock:pcap_open(interface, 104, true, "ip")
|
|
stdnse.print_debug(1, "Will sniff for %s seconds on interface %s.", (timeout/1000),interface)
|
|
|
|
repeat
|
|
|
|
local start_time = nmap.clock_ms() -- Used for script timeout
|
|
sock:set_timeout(timeout)
|
|
local status, _, _, layer3 = sock:pcap_receive()
|
|
|
|
if status then
|
|
|
|
packet_counter=packet_counter+1
|
|
ip_src,ip_dst = get_ip_addresses(layer3)
|
|
stdnse.print_debug(1,"Got IP addresses %s and %s",ip_src,ip_dst)
|
|
|
|
if check_if_valid(ip_src) == true then
|
|
if not unique_addresses[ip_src] then
|
|
unique_addresses[ip_src] = true
|
|
table.insert(all_addresses,ip_src)
|
|
end
|
|
end
|
|
|
|
|
|
if check_if_valid(ip_dst) == true then
|
|
if not unique_addresses[ip_dst] then
|
|
unique_addresses[ip_dst] = true
|
|
table.insert(all_addresses,ip_dst)
|
|
end
|
|
end
|
|
|
|
end
|
|
-- Update timeout
|
|
timeout = timeout - (nmap.clock_ms() - start_time)
|
|
|
|
until timeout <= 0
|
|
|
|
sock:pcap_close()
|
|
end
|
|
|
|
if target.ALLOW_NEW_TARGETS == true then
|
|
for _,v in pairs(all_addresses) do
|
|
target.add(v)
|
|
end
|
|
else
|
|
stdnse.print_debug(1,"Not adding targets to newtargets. If you want to do that use the 'newtargets' script argument.")
|
|
end
|
|
|
|
if #all_addresses>0 then
|
|
stdnse.print_debug(1,"Added %s address(es) to newtargets", #all_addresses)
|
|
end
|
|
|
|
return string.format("Sniffed %s address(es). \n", #all_addresses) .. stdnse.strjoin("\n",all_addresses)
|
|
end
|