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Add a default timeout of 5000 ms to the ntp-info script, and don't try

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sending the second probe if the first caused an error. This is based on
the results of a test by Richard Sammet showing that the default timeout
of 30 s is too long when scanning many open|filtered ports that are in
fact filtered.
This commit is contained in:
david
2009-12-21 20:24:45 +00:00
parent 735c767a71
commit c25165def2
1 changed files with 10 additions and 3 deletions
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13
scripts/ntp-info.nse
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@@ -38,6 +38,10 @@ require "shortport"
portrule = shortport.port_or_service(123, "ntp", {"udp", "tcp"})
-- This script run against open|filtered ports, so don't wait too long if
-- there's no response.
local TIMEOUT = 5000
-- Transform an array into a table where the array's values all map to true.
local function make_set(a)
local i, v, result
@@ -69,8 +73,11 @@ action = function(host, port)
local rlreq = string.char(0x16, 0x02, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00)
status, buftres = comm.exchange(host, port, treq, {proto=port.protocol})
if status then
status, buftres = comm.exchange(host, port, treq, {proto=port.protocol, timeout=TIMEOUT})
if not status then
-- Don't try the second probe if this one didn't work.
return nil
else
local _, sec, frac, tstamp
_, sec, frac = bin.unpack(">II", buftres, 33)
@@ -82,7 +89,7 @@ action = function(host, port)
table.insert(output, string.format("receive time stamp: %s", os.date("%c", tstamp)))
end
status, bufrlres = comm.exchange(host, port, rlreq, {proto=port.protocol})
status, bufrlres = comm.exchange(host, port, rlreq, {proto=port.protocol, timeout=TIMEOUT})
if status then
-- This only looks at the first fragment of what can possibly be several