Remove nearly all bit.lua use

scripts/allseeingeye-info.nse

@@ -3,7 +3,6 @@ local nmap = require "nmap"
 local shortport = require "shortport"
 local string = require "string"
 local bin = require "bin"
-local bit = require "bit"
 local stdnse = require "stdnse"
 
 description = [[
@@ -181,22 +180,22 @@ action = function(host, port)
     pos = pos + 1
 
     local player = stdnse.output_table()
-    if bit.band(flags, 1) ~= 0 then
+    if (flags & 1) ~= 0 then
       pos, player.name = bin.unpack("p", data, pos)
     end
-    if bit.band(flags, 2) ~= 0 then
+    if (flags & 2) ~= 0 then
       pos, player.team = bin.unpack("p", data, pos)
     end
-    if bit.band(flags, 4) ~= 0 then
+    if (flags & 4) ~= 0 then
       pos, player.skin = bin.unpack("p", data, pos)
     end
-    if bit.band(flags, 8) ~= 0 then
+    if (flags & 8) ~= 0 then
       pos, player.score = bin.unpack("p", data, pos)
     end
-    if bit.band(flags, 16) ~= 0 then
+    if (flags & 16) ~= 0 then
       pos, player.ping = bin.unpack("p", data, pos)
     end
-    if bit.band(flags, 32) ~= 0 then
+    if (flags & 32) ~= 0 then
       pos, player.time = bin.unpack("p", data, pos)
     end
 

scripts/backorifice-brute.nse

@@ -1,5 +1,5 @@
-local bin = require "bin"
 local bit = require "bit"
+local bin = require "bin"
 local brute = require "brute"
 local creds = require "creds"
 local nmap = require "nmap"
@@ -175,7 +175,7 @@ local backorifice =
   -- @return seed number containing next seed
   gen_next_seed = function(self, seed)
     seed = seed*214013 + 2531011
-    seed = bit.band(seed,0xffffff)
+    seed = seed & 0xffffff
     return seed
   end,
 
@@ -198,9 +198,9 @@ local backorifice =
       --calculate next seed
       seed = self:gen_next_seed(seed)
       --calculate encryption key based on seed
-      local key = bit.band(bit.arshift(seed,16), 0xff)
+      local key = bit.arshift(seed,16) & 0xff
 
-      crypto_byte = bit.bxor(data_byte,key)
+      crypto_byte = data_byte ~ key
       output = bin.pack("AC",output,crypto_byte)
       --ARGSIZE limitation from BackOrifice server
       if i == 256 then break end

scripts/backorifice-info.nse

@@ -1,5 +1,5 @@
-local bin = require "bin"
 local bit = require "bit"
+local bin = require "bin"
 local nmap = require "nmap"
 local shortport = require "shortport"
 local stdnse = require "stdnse"
@@ -149,7 +149,7 @@ local cmds = {
 
 local function gen_next_seed(seed)
   seed = seed*214013 + 2531011
-  seed = bit.band(seed,0xffffff)
+  seed = seed & 0xffffff
   return seed
 end
 
@@ -202,9 +202,9 @@ local function BOcrypt(data, password, initial_seed )
     --calculate next seed
     seed = gen_next_seed(seed)
     --calculate encryption key based on seed
-    local key = bit.band(bit.arshift(seed,16), 0xff)
+    local key = bit.arshift(seed,16) & 0xff
 
-    crypto_byte = bit.bxor(data_byte,key)
+    crypto_byte = data_byte ~ key
     output = bin.pack("AC",output,crypto_byte)
     if i == 256 then break end --ARGSIZE limitation
   end
@@ -302,16 +302,16 @@ action = function( host, port )
         end
 
         --singular
-        if bit.band(p_type,TYPE.PARTIAL_PACKET)==0x00
+        if (p_type & TYPE.PARTIAL_PACKET)==0x00
-          and bit.band(p_type,TYPE.CONTINUED_PACKET)==0x00 then break end
+          and (p_type & TYPE.CONTINUED_PACKET)==0x00 then break end
 
         --first
-        if bit.band(p_type,TYPE.CONTINUED_PACKET)==0x00 then
+        if (p_type & TYPE.CONTINUED_PACKET)==0x00 then
           multi_flag = true
         end
 
         --last
-        if bit.band(p_type,TYPE.PARTIAL_PACKET)==0x00 then break end
+        if (p_type & TYPE.PARTIAL_PACKET)==0x00 then break end
       end
 
     end

scripts/broadcast-ataoe-discover.nse

@@ -1,5 +1,4 @@
 local bin = require "bin"
-local bit = require "bit"
 local math = require "math"
 local nmap = require "nmap"
 local packet = require "packet"
@@ -67,15 +66,15 @@ ATAoE = {
       pos, verflags, header.error,
         header.major, header.minor,
         header.cmd, header.tag = bin.unpack(">CCSCCI", data)
-      header.version = bit.rshift(verflags, 4)
+      header.version = verflags >> 4
-      header.flags = bit.band(verflags, 0x0F)
+      header.flags = verflags & 0x0F
       return header
     end,
 
     -- return configuration info request as string
     __tostring = function(self)
       assert(self.tag, "No tag was specified in Config Info Request")
-      local verflags = bit.lshift(self.version, 4)
+      local verflags = self.version << 4
       return bin.pack(">CCSCCI", verflags, self.error, self.major, self.minor, self.cmd, self.tag)
     end,
   },

scripts/broadcast-netbios-master-browser.nse

@@ -1,4 +1,3 @@
-local bit = require "bit"
 local netbios = require "netbios"
 local nmap = require "nmap"
 local stdnse = require "stdnse"
@@ -28,7 +27,7 @@ categories = {"broadcast", "safe"}
 
 prerule = function() return true end
 
-local function isGroup(flags) return ( bit.band(flags, 0x8000) == 0x8000 ) end
+local function isGroup(flags) return ( (flags & 0x8000) == 0x8000 ) end
 
 action = function()
 

scripts/broadcast-sybase-asa-discover.nse

@@ -1,5 +1,4 @@
 local bin = require "bin"
-local bit = require "bit"
 local nmap = require "nmap"
 local os = require "os"
 local stdnse = require "stdnse"
@@ -70,7 +69,7 @@ Ping = {
     parse = function(self)
       -- do a very basic length check
       local pos, len = bin.unpack(">I", self.data)
-      len = bit.band(len, 0x0000FFFF)
+      len = len & 0x0000FFFF
 
       if ( len ~= #self.data ) then
         stdnse.debug2("The packet length was reported as %d, expected %d", len, #self.data)

scripts/dns-random-srcport.nse

@@ -1,4 +1,3 @@
-local bit = require "bit"
 local comm = require "comm"
 local nmap = require "nmap"
 local shortport = require "shortport"
@@ -98,13 +97,13 @@ action = function(host, port)
   end
 
   -- Check response flag and recursion
-  if not (bit.band(string.byte(result, 3), 0x80) == 0x80
+  if not ((string.byte(result, 3) & 0x80) == 0x80
-      and bit.band(string.byte(result, 4), 0x80) == 0x80) then
+      and (string.byte(result, 4) & 0x80) == 0x80) then
     return fail("Server refused recursion")
   end
 
   -- Check error flag
-  if (bit.band(string.byte(result, 4), 0x0F) ~= 0x00) then
+  if (string.byte(result, 4) & 0x0F) ~= 0x00 then
     return fail("Server failure")
   end
 

scripts/dns-random-txid.nse

@@ -1,4 +1,3 @@
-local bit = require "bit"
 local comm = require "comm"
 local nmap = require "nmap"
 local shortport = require "shortport"
@@ -98,13 +97,13 @@ action = function(host, port)
   end
 
   -- Check response flag and recursion
-  if not (bit.band(string.byte(result, 3), 0x80) == 0x80
+  if not ((string.byte(result, 3) & 0x80) == 0x80
-      and bit.band(string.byte(result, 4), 0x80) == 0x80) then
+      and (string.byte(result, 4) & 0x80) == 0x80) then
     return fail("Server refused recursion")
   end
 
   -- Check error flag
-  if (bit.band(string.byte(result, 4), 0x0F) ~= 0x00) then
+  if (string.byte(result, 4) & 0x0F) ~= 0x00 then
     return fail("Server failure")
   end
 

scripts/dns-zone-transfer.nse

@@ -1,5 +1,4 @@
 local bin = require "bin"
-local bit = require "bit"
 local dns = require "dns"
 local ipOps = require "ipOps"
 local listop = require "listop"
@@ -295,7 +294,7 @@ local RD = {
     for i=0, len-1 do
       local n = string.byte(data, offset + i)
       for _, v in ipairs(bits) do
-        if bit.band(v, n) > 0 then table.insert(svcs, p) end
+        if (v & n) > 0 then table.insert(svcs, p) end
         p = p + 1
       end
     end
@@ -368,11 +367,11 @@ local RD = {
       return offset, ''
     end
     siz = string.byte(data, offset+1)
-    siz = bit.rshift(siz,4) * 10 ^ bit.band(siz, 0x0f) / 100
+    siz = (siz >> 4) * 10 ^ (siz & 0x0f) / 100
     hp = string.byte(data, offset+2)
-    hp = bit.rshift(hp,4) * 10 ^ bit.band(hp, 0x0f) / 100
+    hp = (hp >> 4) * 10 ^ (hp & 0x0f) / 100
     vp = string.byte(data, offset+3)
-    vp = bit.rshift(vp,4) * 10 ^ bit.band(vp, 0x0f) / 100
+    vp = (vp >> 4) * 10 ^ (vp & 0x0f) / 100
     offset = offset + 4
     offset, lat, lon, alt = bin.unpack(">III", data, offset)
     lat = (lat-2^31)/3600000 --degrees
@@ -420,7 +419,7 @@ local RD = {
   A6 = function(data, offset) -- obsoleted by AAAA
     local prefix, addr, name
     prefix = string.byte(data, offset)
-    local pbytes = bit.rshift(prefix,3)
+    local pbytes = prefix >> 3
     addr = ipOps.str_to_ip(string.rep("\000", pbytes) .. data:sub(offset+1, 16-pbytes))
     offset, name = parse_domain(data, offset + 17 - pbytes)
     return offset, string.format("%d %s %s", prefix, addr, name)
@@ -761,7 +760,7 @@ action = function(host, port)
 
   -- check server response code
   if length < 6 or
-    not (bit.band(string.byte(response_str, 6), 15) == 0) then
+    not ((string.byte(response_str, 6) & 15) == 0) then
     return nil
   end
 

scripts/firewall-bypass.nse

@@ -1,6 +1,5 @@
 local nmap = require "nmap"
 local stdnse = require "stdnse"
-local bit = require "bit"
 local string = require "string"
 local packet = require "packet"
 
@@ -75,8 +74,8 @@ ftp_helper = {
       -- IPv4 payload
       payload = "227 Entering Passive Mode (" ..
       string.gsub(host.ip,"%.",",") .. "," ..
-      bit.band(bit.rshift(targetport, 8), 0xff) ..
+      ((targetport >> 8) & 0xff) ..
-      "," .. bit.band(targetport, 0xff) ..
+      "," .. (targetport & 0xff) ..
       ")\r\n"
       ethertype = "\x08\0" -- Ethernet Type: IPv4
 

scripts/http-exif-spider.nse

@@ -31,7 +31,6 @@ local stdnse = require 'stdnse'
 local httpspider = require 'httpspider'
 local string = require 'string'
 local bin = require 'bin'
-local bit = require 'bit'
 local table = require 'table'
 
 -- These definitions are copied/pasted/reformatted from the jhead-2.96 sourcecode
@@ -369,10 +368,10 @@ local function process_gps(data, pos, endian, result)
       end
     elseif(tag == GPS_TAG_LATITUDEREF) then
       -- Get the first byte in the latitude reference as a character
-      latitude_ref = string.char(bit.rshift(value, 24))
+      latitude_ref = string.char(value >> 24)
     elseif(tag == GPS_TAG_LONGITUDEREF) then
       -- Get the first byte in the longitude reference as a character
-      longitude_ref = string.char(bit.rshift(value, 24))
+      longitude_ref = string.char(value >> 24)
     end
   end
 

scripts/http-vuln-cve2014-3704.nse

@@ -1,4 +1,3 @@
-local bit = require "bit"
 local http = require "http"
 local shortport = require "shortport"
 local stdnse = require "stdnse"
@@ -131,12 +130,12 @@ local function phpass_encode64(input)
   while cur < count do
     local value = string.byte(input, cur)
     cur = cur + 1
-    table.insert(out, itoa64(bit.band(value, 0x3f)))
+    table.insert(out, itoa64(value & 0x3f))
 
     if cur < count then
-      value = bit.bor(value, bit.lshift(string.byte(input, cur), 8))
+      value = value | (string.byte(input, cur) << 8)
     end
-    table.insert(out, itoa64(bit.band(bit.rshift(value, 6), 0x3f)))
+    table.insert(out, itoa64((value >> 6) & 0x3f))
 
     if cur >= count then
       break
@@ -144,16 +143,16 @@ local function phpass_encode64(input)
     cur = cur + 1
 
     if cur < count then
-      value = bit.bor(value, bit.lshift(string.byte(input, cur), 16))
+      value = value | (string.byte(input, cur) << 16)
     end
-    table.insert(out, itoa64(bit.band(bit.rshift(value, 12), 0x3f)))
+    table.insert(out, itoa64((value >> 12) & 0x3f))
 
     if cur >= count then
       break
     end
     cur = cur + 1
 
-    table.insert(out, itoa64(bit.band(bit.rshift(value, 18), 0x3f)))
+    table.insert(out, itoa64((value >> 18) & 0x3f))
   end
 
   return table.concat(out)

scripts/ip-geolocation-maxmind.nse

@@ -1,4 +1,3 @@
-local bit = require "bit"
 local geoip = require "geoip"
 local io = require "io"
 local ipOps = require "ipOps"
@@ -474,7 +473,7 @@ local GeoIP = {
           -- the original representation in the MaxMind API is ANSI C integer
           -- which should not overflow the greatest value Lua can offer ;)
           for j=0,(MaxmindDef.SEGMENT_RECORD_LENGTH-1) do
-            o._databaseSegments = o._databaseSegments + bit.lshift( buf:byte(j+1), j*8)
+            o._databaseSegments = o._databaseSegments + ( buf:byte(j+1) << j*8)
           end
 
           if o._databaseType == MaxmindDef.ORG_EDITION or o._databaseType == MaxmindDef.ISP_EDITION then
@@ -548,16 +547,16 @@ local GeoIP = {
     start_pos = end_pos + 1
 
     local c1,c2,c3=record_buf:byte(start_pos,start_pos+3)
-    record.latitude = (( bit.lshift(c1,0*8) + bit.lshift(c2,1*8) + bit.lshift(c3,2*8) )/10000) - 180
+    record.latitude = (( (c1 << 0*8) + (c2 << 1*8) + (c3 << 2*8) )/10000) - 180
     start_pos = start_pos +3
 
     c1,c2,c3=record_buf:byte(start_pos,start_pos+3)
-    record.longitude = (( bit.lshift(c1,0*8) + bit.lshift(c2,1*8) + bit.lshift(c3,2*8) )/10000) - 180
+    record.longitude = (( (c1 << 0*8) + (c2 << 1*8) + (c3 << 2*8) )/10000) - 180
     start_pos = start_pos +3
 
     if self._databaseType == MaxmindDef.CITY_EDITION_REV1 and record.country_code=='US' then
       c1,c2,c3=record_buf:byte(start_pos,start_pos+3)
-      local dmaarea_combo= bit.lshift(c1,0*8) + bit.lshift(c2,1*8) + bit.lshift(c3,2*8)
+      local dmaarea_combo= (c1 << 0*8) + (c2 << 1*8) + (c3 << 2*8)
       record.dma_code = math.floor(dmaarea_combo/1000)
       record.area_code = dmaarea_combo % 1000
     else
@@ -585,11 +584,11 @@ local GeoIP = {
 
       for i=0,1 do
         for j=0,(self._recordLength-1) do
-          x[i] = x[i] + bit.lshift(buf:byte((self._recordLength * i + j) +1 ), j*8)
+          x[i] = x[i] + (buf:byte((self._recordLength * i + j) +1 ) << j*8)
         end
       end
       -- Gotta test this out thoroughly because of the ipnum
-      if bit.band(ipnum, bit.lshift(1,depth)) ~= 0 then
+      if (ipnum & (1 << depth)) ~= 0 then
         if x[1] >= self._databaseSegments then
           return x[1]
         end

scripts/knx-gateway-discover.nse

@@ -3,7 +3,6 @@ local coroutine = require "coroutine"
 local stdnse = require "stdnse"
 local table = require "table"
 local bin = require "bin"
-local bit = require "bit"
 local packet = require "packet"
 local ipOps = require "ipOps"
 local string = require "string"
@@ -120,9 +119,9 @@ end
 -- Parse a KNX address from raw bytes
 -- @param addr Unpacked 2 bytes
 local parseKnxAddress = function(addr)
-  local a = bit.rshift(bit.band(addr, 0xf000),12)
+  local a = (addr & 0xf000) >> 12
-  local b = bit.rshift(bit.band(addr, 0x0f00), 8)
+  local b = (addr & 0x0f00) >> 8
-  local c = bit.band(addr, 0xff)
+  local c = addr & 0xff
   return a..'.'..b..'.'..c
 end
 

scripts/llmnr-resolve.nse

@@ -2,7 +2,6 @@ local nmap = require "nmap"
 local stdnse = require "stdnse"
 local table = require "table"
 local bin = require "bin"
-local bit = require "bit"
 local packet = require "packet"
 local ipOps = require "ipOps"
 local target = require "target"
@@ -111,7 +110,7 @@ local llmnrListen = function(interface, timeout, result)
       -- Make verifications
       -- Message == Response bit
       -- and 1 Question (hostname we requested) and
-      if (bit.rshift(flags, 15) == 1) and questions == 0x01 then
+      if ((flags >> 15) == 1) and questions == 0x01 then
         stdnse.debug1("got response from %s", p.ip_src)
         -- Skip header's 12 bytes
         -- extract host length

scripts/ntp-monlist.nse

@@ -1,5 +1,4 @@
 local bin = require "bin"
-local bit = require "bit"
 local ipOps = require "ipOps"
 local math = require "math"
 local nmap = require "nmap"
@@ -320,14 +319,14 @@ function check(status, response, track)
   end
 
   -- response bit set
-  if bit.rshift(pkt:u8(off), 7) ~= 1 then
+  if (pkt:u8(off) >> 7) ~= 1 then
     track.errcond = true
     track.evil_pkts = track.evil_pkts+1
     stdnse.debug1('Bad response from %s - did not have response bit set.', track.target)
     return nil
   end
   -- version is as expected
-  val = bit.band(bit.rshift(pkt:u8(off), 3), 0x07)
+  val = (pkt:u8(off) >> 3) & 0x07
   if val ~= track.v then
     track.errcond = true
     track.evil_pkts = track.evil_pkts+1
@@ -335,7 +334,7 @@ function check(status, response, track)
     return nil
   end
   -- mode is as expected
-  val = bit.band(pkt:u8(off), 0x07)
+  val = pkt:u8(off) & 0x07
   if val ~= track.m then
     track.errcond = true
     track.evil_pkts = track.evil_pkts+1
@@ -360,7 +359,7 @@ function check(status, response, track)
   end
   -- NTP error conditions - defined codes are not evil (bogus codes are).
   local fail, msg = false
-  local err = bit.band(bit.rshift(pkt:u8(off+4), 4), 0x0f)
+  local err = (pkt:u8(off+4) >> 4) & 0x0f
   if err == 0 then
     -- NoOp
   elseif err == 1 then
@@ -397,9 +396,9 @@ function check(status, response, track)
   -- implementation and request type.
 
   -- Err 4 bits, Number of Data Items 12 bits
-  local icount = bit.band(pkt:u16(off+4), 0xFFF)
+  local icount = pkt:u16(off+4) & 0xFFF
   -- MBZ 4 bits, Size of Data Items: 12 bits
-  local isize  = bit.band(pkt:u16(off+6), 0xFFF)
+  local isize  = pkt:u16(off+6) & 0xFFF
   if icount < 1 then
     track.errcond = true
     track.evil_pkts = track.evil_pkts+1
@@ -436,7 +435,7 @@ function check(status, response, track)
   end
 
   -- is the response out of sequence, a duplicate or is it peachy
-  local seq = bit.band(pkt:u8(off+1), 0x7f)
+  local seq = pkt:u8(off+1) & 0x7f
   if seq == track.hseq+1 then -- all good
     track.hseq = track.hseq+1
   elseif track.mseq:match(('|%d|'):format(seq)) then -- one of our missing seq#
@@ -464,7 +463,7 @@ function check(status, response, track)
 
   -- if the more bit is set or if we have missing sequence numbers then we'll
   -- want to receive more packets after parsing this one.
-  local more = bit.band(bit.rshift(pkt:u8(off), 6), 0x01)
+  local more = (pkt:u8(off) >> 6) & 0x01
   if more == 1 then
     track.rcv_again = true
   elseif track.mseq:len() > 1 then
@@ -554,8 +553,8 @@ end
 function parse_monlist_1(pkt, recs)
 
   local off = pkt.udp_offset + 8 -- beginning of NTP
-  local icount = bit.band(pkt:u16(off+4), 0xFFF)
+  local icount = pkt:u16(off+4) & 0xFFF
-  local isize  = bit.band(pkt:u16(off+6), 0xFFF)
+  local isize  = pkt:u16(off+6) & 0xFFF
   local remaining = icount
 
   off = off+8 -- beginning of data section
@@ -593,7 +592,7 @@ function parse_monlist_1(pkt, recs)
     -- Some implementations are not doing htonl for this field?
     if t.flags > 0xFFFFFF then
       -- only concerned with the high order byte
-      t.flags = bit.rshift(t.flags, 24)
+      t.flags = t.flags >> 24
     end
     t.mode    = pkt:u8(pos+30)
     t.version = pkt:u8(pos+31)
@@ -622,8 +621,8 @@ end
 function parse_peerlist(pkt, recs)
 
   local off = pkt.udp_offset + 8 -- beginning of NTP
-  local icount = bit.band(pkt:u16(off+4), 0xFFF)
+  local icount = pkt:u16(off+4) & 0xFFF
-  local isize  = bit.band(pkt:u16(off+6), 0xFFF)
+  local isize  = pkt:u16(off+6) & 0xFFF
   local remaining = icount
 
   off = off+8 -- beginning of data section
@@ -814,7 +813,7 @@ function interpret(recs, targetip)
   -- busy the server is.
   if t.have_peerlist then
     for _, peer in ipairs(recs.peerlist) do
-      if bit.band(peer.flags, 0x2) == 0x2 then
+      if (peer.flags & 0x2) == 0x2 then
         t.sync = peer.saddr
         if peer.saddr:match('^127') then -- always IPv4, never IPv6!
           t.sync = t.sync .. ' (reference clock)'

scripts/pcanywhere-brute.nse

@@ -4,7 +4,6 @@ local nmap = require "nmap"
 local shortport = require "shortport"
 local stdnse = require "stdnse"
 local string = require "string"
-local bit = require "bit"
 local bin = require "bin"
 local table = require "table"
 description = [[
@@ -48,9 +47,9 @@ local function encrypt(data)
   local xor_key = 0xab
   local k = 0
   if data then
-    result[1] = bit.bxor(string.byte(data),xor_key)
+    result[1] = string.byte(data) ~ xor_key
     for i = 2,string.len(data) do
-      result[i] = bit.bxor(result[i-1],string.byte(data,i),i-2)
+      result[i] = result[i-1] ~ string.byte(data,i) ~ i-2
     end
   end
   return string.char(table.unpack(result))

scripts/smb-brute.nse

@@ -1,4 +1,3 @@
-local bit = require "bit"
 local msrpc = require "msrpc"
 local nmap = require "nmap"
 local smb = require "smb"
@@ -405,10 +404,10 @@ local function count_ones(num)
   local count = 0
 
   while num ~= 0 do
-    if(bit.band(num, 1) == 1) then
+    if((num & 1) == 1) then
       count = count + 1
     end
-    num = bit.rshift(num, 1)
+    num = num >> 1
   end
 
   return count
@@ -431,7 +430,7 @@ local function convert_case(str, num)
 
   while(num ~= 0) do
     -- Check if the bit we're at is '1'
-    if(bit.band(num, 1) == 1) then
+    if((num & 1) == 1) then
       -- Check if we're at the beginning or end (or both) of the string -- those are special cases
       if(pos == #str and pos == 1) then
         str = string.upper(string.sub(str, pos, pos))
@@ -444,7 +443,7 @@ local function convert_case(str, num)
       end
     end
 
-    num = bit.rshift(num, 1)
+    num = num >> 1
 
     pos = pos - 1
   end

scripts/smb-ls.nse

@@ -1,4 +1,3 @@
-local bit    = require 'bit'
 local smb    = require 'smb'
 local string = require 'string'
 local stdnse = require 'stdnse'
@@ -124,7 +123,7 @@ end
 
 -- checks whether the file entry is a directory
 local function is_dir(fe)
-  return ( bit.band(fe.attrs, 16) == 16 )
+  return ( (fe.attrs & 16) == 16 )
 end
 
 local function list_files(host, share, smbstate, path, options, output, maxdepth, basedir)

scripts/smb-mbenum.nse

@@ -1,4 +1,3 @@
-local bit = require "bit"
 local msrpc = require "msrpc"
 local smb = require "smb"
 local stdnse = require "stdnse"
@@ -203,7 +202,7 @@ action = function(host, port)
   local results, output = {}, {}
   for k, _ in pairs(ServerTypes) do
     for _, server in ipairs(entries) do
-      if ( TypeNames[k] and bit.band(server.type,ServerTypes[k]) == ServerTypes[k] ) then
+      if ( TypeNames[k] and (server.type & ServerTypes[k]) == ServerTypes[k] ) then
         results[TypeNames[k].long] = results[TypeNames[k].long] or {}
         if ( format == OutputFormat.BY_TYPE_V_DETAILED ) then
           table.insert(results[TypeNames[k].long], server)

scripts/smb-psexec.nse

@@ -1,5 +1,4 @@
 local _G = require "_G"
-local bit = require "bit"
 local io = require "io"
 local math = require "math"
 local msrpc = require "msrpc"
@@ -1047,7 +1046,7 @@ local function cipher(str, config)
 
   for i = 1, #str, 1 do
     local c = string.byte(str, i)
-    c = string.char(bit.bxor(c, string.byte(config.key, config.key_index + 1)))
+    c = string.char(c ~ string.byte(config.key, config.key_index + 1))
 
     config.key_index = config.key_index + 1
     config.key_index = config.key_index % #config.key
@@ -1066,7 +1065,7 @@ local function get_overrides()
   -- 0x00000800 = Compressed file
   -- 0x00000002 = Hidden file
   -- 0x00000004 = System file
-  local attr = bit.bor(0x00000004,0x00000002,0x00000800,0x00000100,0x00002000,0x00004000)
+  local attr = 0x00000004 | 0x00000002 | 0x00000800 | 0x00000100 | 0x00002000 | 0x00004000
 
   -- Let the user override this behaviour
   if(stdnse.get_script_args( "nohide" )) then