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Fix an error in crc32 function in nrpe-enum. Fixes #1199

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dmiller
2018-05-03 16:52:39 +00:00
parent d35714e354
commit 99b9735715
1 changed files with 3 additions and 9 deletions
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12
scripts/nrpe-enum.nse
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@@ -1,5 +1,4 @@
local bin = require "bin"
local bit = require "bit"
local nmap = require "nmap"
local shortport = require "shortport"
local stdnse = require "stdnse"
@@ -108,17 +107,12 @@ local CRC32_CONSTANTS = {
local crc32 = function(s)
local crc = 0xFFFFFFFF
for i = 1, #s do
local p1 = s:byte(i)
local p2 = bit.bxor(crc, p1)
local p3 = bit.band(p2, 0xFF)
local p4 = bit.band(p3)
local p4 = (crc ~ s:byte(i)) & 0xff
local p5 = CRC32_CONSTANTS[p4 + 1]
local p6 = bit.rshift(crc, 8)
crc = bit.bxor(p6, p5)
crc = p5 ~ (crc >> 8)
end
return bit.bxor(crc, 0xFFFFFFFF)
return crc ~ 0xFFFFFFFF
end
local nrpe_open = function(host, port)