diff --git a/nselib/eigrp.lua b/nselib/eigrp.lua
index 93b43a8ff..a4d6b9d46 100644
--- a/nselib/eigrp.lua
+++ b/nselib/eigrp.lua
@@ -5,10 +5,10 @@
 -- Version 0.1
 --  19/07/2012 - First version.
 
-local bin = require "bin"
 local table = require "table"
 local stdnse = require "stdnse"
 local strbuf = require "strbuf"
+local string = require "string"
 local ipOps = require "ipOps"
 local packet = require "packet"
 _ENV = stdnse.module("eigrp", stdnse.seeall)
@@ -104,53 +104,53 @@ EIGRP = {
     local tlv
     local eigrp_packet = {}
     local index = 1
-    index, eigrp_packet.ver = bin.unpack(">C", eigrp_raw, index)
-    index, eigrp_packet.opcode = bin.unpack(">C", eigrp_raw, index)
-    index, eigrp_packet.checksum = bin.unpack(">S", eigrp_raw, index)
-    index, eigrp_packet.flags = bin.unpack(">I", eigrp_raw, index)
-    index, eigrp_packet.seq = bin.unpack(">I", eigrp_raw, index)
-    index, eigrp_packet.ack = bin.unpack(">I", eigrp_raw, index)
-    index, eigrp_packet.routerid = bin.unpack(">S", eigrp_raw, index)
-    index, eigrp_packet.as = bin.unpack(">S", eigrp_raw, index)
+    eigrp_packet.ver,
+    eigrp_packet.opcode,
+    eigrp_packet.checksum,
+    eigrp_packet.flags,
+    eigrp_packet.seq,
+    eigrp_packet.ack,
+    eigrp_packet.routerid,
+    eigrp_packet.as, index = string.unpack(">BBI2I4I4I4I2I2", eigrp_raw, index)
     eigrp_packet.tlvs = {}
     while index < #eigrp_raw do
       tlv = {}
-      index, tlv.type = bin.unpack(">S", eigrp_raw, index)
-      index, tlv.length = bin.unpack(">S", eigrp_raw, index)
+      tlv.type, tlv.length, index = string.unpack(">I2I2", eigrp_raw, index)
       if tlv.length == 0x00 then
         -- In case someone wants to DoS us :)
         stdnse.debug1("eigrp.lua: stopped parsing due to null TLV length.")
         break
       end
+      -- TODO: These padding calculations seem suspect, especially the ones
+      -- that assume a static length for a variable-length field like TLV.SEQ
       if tlv.type == TLV.PARAM then
         -- Parameters
         local k = {}
-        index, k[1], k[2], k[3], k[4], k[5], k[6]  = bin.unpack(">CCCCCC", eigrp_raw, index)
-        index, tlv.htime = bin.unpack(">S", eigrp_raw, index)
+        k[1], k[2], k[3], k[4], k[5], k[6], tlv.htime, index = string.unpack(">BBBBBBI2", eigrp_raw, index)
+        tlv.k = k
         index = index + tlv.length - 12
       elseif tlv.type == TLV.AUTH then
-        index, tlv.authtype = bin.unpack(">S", eigrp_raw, index)
-        index, tlv.authlen = bin.unpack(">S", eigrp_raw, index)
-        index, tlv.keyid = bin.unpack(">I", eigrp_raw, index)
-        index, tlv.keyseq = bin.unpack(">I", eigrp_raw, index)
+        tlv.authtype,
+        tlv.authlen,
+        tlv.keyid,
+        tlv.keyseq, index = string.unpack(">I2I2I4I4", eigrp_raw, index)
         -- Null pad == tlv.length - What was already parsed - authlen
-        index, tlv.digest = bin.unpack(">S", eigrp_raw, index + (tlv.length - tlv.authlen - index + 1))
+        tlv.digest, index = string.unpack(">I2", eigrp_raw, index + (tlv.length - tlv.authlen - index + 1))
       elseif tlv.type == TLV.SEQ then
         -- Sequence
-        index, tlv.addlen = bin.unpack(">S", eigrp_raw, index)
-        index, tlv.address = bin.unpack("A".. tlv.addlen, eigrp_raw, index)
+        tlv.address, index = string.unpack(">s2", eigrp_raw, index)
         tlv.address = ipOps.str_to_ip(tlv.address)
         index = index + tlv.length - 7
       elseif tlv.type == TLV.SWVER then
         -- Software version
-        index, tlv.majv = bin.unpack(">C", eigrp_raw, index)
-        index, tlv.minv = bin.unpack(">C", eigrp_raw, index)
-        index, tlv.majtlv = bin.unpack(">C", eigrp_raw, index)
-        index, tlv.mintlv = bin.unpack(">C", eigrp_raw, index)
+        tlv.majv,
+        tlv.minv,
+        tlv.majtlv,
+        tlv.mintlv, index = string.unpack(">BBBB", eigrp_raw, index)
         index = index + tlv.length - 8
       elseif tlv.type == TLV.MSEQ then
         -- Next Multicast Sequence
-        index, tlv.mseq = bin.unpack(">I", eigrp_raw, index)
+        tlv.mseq, index = string.unpack(">I4", eigrp_raw, index)
         index = index + tlv.length - 8
       elseif tlv.type == TLV.STUB then
         -- TODO
@@ -170,50 +170,44 @@ EIGRP = {
         index = index + tlv.length - 4
       elseif tlv.type == TLV.INT then
         -- Internal Route
-        index, tlv.nexth = bin.unpack(">I", eigrp_raw, index)
+        tlv.nexth, index = string.unpack(">I4", eigrp_raw, index)
         tlv.nexth = ipOps.fromdword(tlv.nexth)
-        index, tlv.mask = bin.unpack(">S", eigrp_raw, index + 15)
+        tlv.mask, index = string.unpack(">I2", eigrp_raw, index + 15)
         -- Destination varies in length
         -- e.g trailing 0's are omitted
         -- if length = 29 => destination is 4 bytes
         -- if length = 28 => destination is 3 bytes
         -- if length = 27 => destination is 2 bytes
         -- if length = 26 => destination is 1 byte
-        local dst = {}
-        index, dst[1], dst[2], dst[3], dst[4] = bin.unpack(">C" .. 4 + tlv.length - 29, eigrp_raw, index)
-        for i=2,4 do
-          if not dst[i] then
-            dst[i] = '0'
-          end
+        local dst = {0,0,0,0}
+        for i = 1, (4 + tlv.length - 29) do
+          dst[i], index = string.unpack("B", eigrp_raw, index)
         end
-        tlv.dst = dst[1] .. '.' .. dst[2] .. '.' .. dst[3] .. '.' .. dst[4]
+        tlv.dst = table.concat(dst, '.')
       elseif tlv.type == TLV.EXT then
         -- External Route
-        index, tlv.nexth = bin.unpack(">I", eigrp_raw, index)
-        tlv.nexth = ipOps.fromdword(tlv.nexth)
-        index, tlv.orouterid = bin.unpack(">I", eigrp_raw, index)
-        tlv.orouterid = ipOps.fromdword(tlv.orouterid)
-        index, tlv.oas = bin.unpack(">I", eigrp_raw, index)
-        index, tlv.tag = bin.unpack(">I", eigrp_raw, index)
-        index, tlv.emetric = bin.unpack(">I", eigrp_raw, index)
+        tlv.nexth,
+        tlv.orouterid,
+        tlv.oas,
+        tlv.tag,
+        tlv.emetric,
         -- Skip 2 reserved bytes
-        index, tlv.eproto = bin.unpack(">C", eigrp_raw, index + 2)
-        index, tlv.eflags = bin.unpack(">C", eigrp_raw, index)
-        index, tlv.lmetrics = bin.unpack(">L"..2, eigrp_raw, index)
-        index, tlv.mask = bin.unpack(">C", eigrp_raw, index)
+        tlv.eproto,
+        tlv.eflags,
+        tlv.lmetrics,
+        tlv.mask, index = string.unpack(">I4I4I4I4I4xxBBc16B", eigrp_raw, index)
+        tlv.nexth = ipOps.fromdword(tlv.nexth)
+        tlv.orouterid = ipOps.fromdword(tlv.orouterid)
         -- Destination varies in length
         -- if length = 49 => destination is 4 bytes
         -- if length = 48 => destination is 3 bytes
         -- if length = 47 => destination is 2 bytes
         -- if length = 46 => destination is 1 byte
-        local dst = {}
-        index, dst[1], dst[2], dst[3], dst[4] = bin.unpack(">C" .. 4 + tlv.length - 49, eigrp_raw, index)
-        for i=2,4 do
-          if not dst[i] then
-            dst[i] = '0'
-          end
+        local dst = {0,0,0,0}
+        for i = 1, (4 + tlv.length - 49) do
+          dst[i], index = string.unpack("B", eigrp_raw, index)
         end
-        tlv.dst = dst[1] .. '.' .. dst[2] .. '.' .. dst[3] .. '.' .. dst[4]
+        tlv.dst = table.concat(dst, '.')
       elseif tlv.type == TLV.COM then
         -- TODO
         stdnse.debug1("eigrp.lua: TLV type %d skipped due to no parser.", tlv.type)
@@ -310,28 +304,23 @@ EIGRP = {
     -- @return data string containing the complete request to send over the socket
     __tostring = function(self)
       local data = strbuf.new()
-      data = data .. bin.pack(">C", self.ver) -- Version 2
-      data = data .. bin.pack(">C", self.opcode) -- Opcode: Hello
+      data = data .. string.pack(">BBI2I4I4I4I2I2",
+        self.ver, -- Version 2
+        self.opcode, -- Opcode: Hello
+        self.checksum or 0, -- Calculated later.
+        self.flags, -- Flags
+        self.seq, -- Sequence 0
+        self.ack, -- Acknowledge 0
+        self.routerid, -- Virtual Router ID 0
+        self.as) -- Autonomous system
 
-      -- If checksum not manually.
-      -- set to 0, then calculate it later
-      if self.checksum then
-        data = data .. bin.pack(">S", self.checksum)
-      else
-        data = data .. bin.pack(">S", 0x0000) -- Calculated later.
-      end
-      data = data .. bin.pack(">I", self.flags) -- Flags
-      data = data .. bin.pack(">I", self.seq) -- Sequence 0
-      data = data .. bin.pack(">I", self.ack) -- Acknowledge 0
-      data = data .. bin.pack(">S", self.routerid) -- Virtual Router ID 0
-      data = data .. bin.pack(">S", self.as) -- Autonomous system
       for _, tlv in pairs(self.tlvs) do
         if tlv.type == TLV.PARAM then
-          data = data .. bin.pack(">S", TLV.PARAM)
-          data = data .. bin.pack(">S", 0x000c) -- Length: 12
-          data = data .. bin.pack(">CCCCCC", tlv.k[1],tlv.k[2],tlv.k[3],
-          tlv.k[4],tlv.k[5],tlv.k[6])
-          data = data .. bin.pack(">S", tlv.htime)
+          data = data .. string.pack(">I2I2 BBBBBB I2",
+            TLV.PARAM,
+            12, -- Length
+            tlv.k[1], tlv.k[2], tlv.k[3], tlv.k[4], tlv.k[5], tlv.k[6],
+            tlv.htime)
         elseif tlv.type == TLV.AUTH then
           -- TODO
           stdnse.debug1("eigrp.lua: TLV type %d skipped due to no parser.", tlv.type)
@@ -339,10 +328,11 @@ EIGRP = {
           -- TODO
           stdnse.debug1("eigrp.lua: TLV type %d skipped due to no parser.", tlv.type)
         elseif tlv.type == TLV.SWVER then
-          data = data .. bin.pack(">S", TLV.SWVER)
-          data = data .. bin.pack(">S", 0x0008)
-          data = data .. bin.pack(">CC", tonumber(tlv.majv), tonumber(tlv.minv))
-          data = data .. bin.pack(">CC", tonumber(tlv.majtlv), tonumber(tlv.mintlv))
+          data = data .. string.pack(">I2I2 BB BB",
+            TLV.SWVER,
+            0x0008,
+            tonumber(tlv.majv), tonumber(tlv.minv),
+            tonumber(tlv.majtlv), tonumber(tlv.mintlv))
         elseif tlv.type == TLV.MSEQ then
           -- TODO
           stdnse.debug1("eigrp.lua: TLV type %d skipped due to no parser.", tlv.type)
@@ -383,7 +373,7 @@ EIGRP = {
       data = strbuf.dump(data)
       -- In the end, correct the checksum if not manually set
       if not self.checksum then
-        data = data:sub(1,2) .. bin.pack(">S", packet.in_cksum(data)) .. data:sub(5)
+        data = data:sub(1,2) .. string.pack(">I2", packet.in_cksum(data)) .. data:sub(5)
       end
       return data
     end,
diff --git a/nselib/mongodb.lua b/nselib/mongodb.lua
index ee9060032..65187ba32 100644
--- a/nselib/mongodb.lua
+++ b/nselib/mongodb.lua
@@ -9,7 +9,6 @@
 -- Created 01/13/2010 - v0.1 - created by Martin Holst Swende <martin@swende.se>
 -- Revised 01/03/2012 - v0.2 - added authentication support <patrik@cqure.net>
 
-local bin = require "bin"
 local nmap = require "nmap"
 local stdnse = require "stdnse"
 local string = require "string"
@@ -51,7 +50,6 @@ local err =stdnse.debug1
 
 -- Created 01/13/2010 - v0.1 - created by Martin Holst Swende <martin@swende.se>
 --module("bson", package.seeall)
---require("bin")
 local function dbg_err(str,...)
   stdnse.debug1("Bson-ERR:"..str, ...)
 end
@@ -75,10 +73,10 @@ local function _element_to_bson(key, value)
     return false, ("key %r must not contain '.'"):format(tostring(key))
   end
 
-  local name =bin.pack("z",key) -- null-terminated string
+  local name = string.pack("z", key) -- null-terminated string
   if type(value) == 'string' then
-    local cstring = bin.pack("z",value) -- null-terminated string
-    local length = bin.pack("<i", cstring:len())
+    local cstring = string.pack("z", value) -- null-terminated string
+    local length = string.pack("<i4", cstring:len())
     local op = "\x02"
     return true, op .. name .. length .. cstring
   elseif type(value) =='table' then
@@ -86,9 +84,7 @@ local function _element_to_bson(key, value)
   elseif type(value)== 'boolean' then
     return true, "\x08" .. name .. (value and '\x01' or '\0')
   elseif type(value) == 'number' then
-    --return "\x10" .. name .. bin.pack("<i", value)
-    -- Use 01 - double for - works better than 10
-    return true, '\x01' .. name .. bin.pack("<d", value)
+    return true, '\x01' .. name .. string.pack("<d", value)
   end
 
   local _ = ("cannot convert value of type %s to bson"):format(type(value))
@@ -131,7 +127,7 @@ function toBson(dict)
   end
   dbg("Packet length is %d",length)
   --Final pack
-  return true, bin.pack("<I", length) .. elements .. "\0"
+  return true, string.pack("<I4z", length, elements)
 end
 
 -- Reads a null-terminated string. If length is supplied, it is just cut
@@ -162,10 +158,11 @@ end
 -- @return error string if error occurred
 local function parse(code,data)
   if 1 == code  then -- double
-    return bin.unpack("<d", data)
+    local v, pos = string.unpack("<d", data)
+    return pos, v
   elseif 2 == code then -- string
     -- data length = first four bytes
-    local _,len = bin.unpack("<i",data)
+    local len = string.unpack("<i4",data)
     -- string data = data[5] -->
     local value = get_c_string(data:sub(5), len)
     -- Count position as header (=4) + length of string (=len)+ null char (=1)
@@ -174,7 +171,7 @@ local function parse(code,data)
     local object, err
 
     -- Need to know the length, to return later
-    local _,obj_size = bin.unpack("<i", data)
+    local obj_size = string.unpack("<i4", data)
     -- Now, get the data object
     dbg("Recursing into bson array")
     object, data, err = fromBson(data)
@@ -186,7 +183,8 @@ local function parse(code,data)
   elseif 8 == code then -- Boolean
     return 2, data:byte(1) == 1
   elseif 9 == code then -- int64, UTC datetime
-    return bin.unpack("<l", data)
+    local v, pos = string.unpack("<i8", data)
+    return pos, v
   elseif 10 == code then -- nullvalue
     return 0,nil
     --11= _get_regex
@@ -195,10 +193,12 @@ local function parse(code,data)
     --14= _get_string, # symbol
     --15=  _get_code_w_scope
   elseif 16 == code then -- 4 byte integer
-    return bin.unpack("<i", data)
+    local v, pos = string.unpack("<i4", data)
+    return pos, v
     --17= _get_timestamp
   elseif 18 == code then -- long
-    return bin.unpack("<l", data)
+    local v, pos = string.unpack("<i8", data)
+    return pos, v
   end
   local err = ("Getter for %d not implemented"):format(code)
   return 0, data, err
@@ -257,7 +257,7 @@ function isPacketComplete(data)
     return false
   end
 
-  local _,obj_size = bin.unpack("<i", data)
+  local obj_size = string.unpack("<i4", data)
 
   dbg("BSon packet size is %s", obj_size)
 
@@ -376,12 +376,12 @@ MongoData ={
 --Adds unsigned int32 to the message body
 --@param value the value to add
 function MongoData:addUnsignedInt32(value)
-  self.valueString = self.valueString..bin.pack("<I",value)
+  self.valueString = self.valueString..string.pack("<I4",value)
 end
 -- Adds a string to the message body
 --@param value the string to add
 function MongoData:addString(value)
-  self.valueString = self.valueString..bin.pack('z',value)
+  self.valueString = self.valueString..string.pack('z',value)
 end
 -- Add a table as a BSon object to the body
 --@param dict the table to be converted to BSon
@@ -478,11 +478,11 @@ end
 --@return int32 value
 --@return data unread
 local function parseInt32(data)
-  local pos,val = bin.unpack("<i",data)
+  local val, pos = string.unpack("<i4", data)
   return val, data:sub(pos)
 end
 local function parseInt64(data)
-  local pos,val =  bin.unpack("<l",data)
+  local val, pos =  string.unpack("<i8", data)
   return val, data:sub(pos)
 end
 -- Parses response header
@@ -529,7 +529,7 @@ function isPacketComplete(data)
     return false
   end
 
-  local _,obj_size = bin.unpack("<i", data)
+  local obj_size = string.unpack("<i4", data)
 
   dbg("MongoDb Packet size is %s, (got %d)", obj_size,data:len())
 
diff --git a/nselib/srvloc.lua b/nselib/srvloc.lua
index 10fa39a09..c9d969f09 100644
--- a/nselib/srvloc.lua
+++ b/nselib/srvloc.lua
@@ -31,9 +31,9 @@
 -- Version 0.1
 -- Created 24/04/2011 - v0.1 - created by Patrik Karlsson <patrik@cqure.net>
 
-local bin = require "bin"
 local nmap = require "nmap"
 local stdnse = require "stdnse"
+local string = require "string"
 local table = require "table"
 _ENV = stdnse.module("srvloc", stdnse.seeall)
 
@@ -62,28 +62,17 @@ Reply = {
     -- @param data string containing the raw reply as read from the socket
     parse = function(self, data)
       local pos
-      local len_hi, len_lo
 
-      pos, self.version, self.func, len_hi, len_lo = bin.unpack(">CCCS", data)
-      self.len = (len_hi << 16) + len_lo
-      pos, self.flags = bin.unpack(">S", data, pos)
+      self.version, self.func, self.len, self.flags, pos = string.unpack(">BBI3I2", data)
 
-      local neo_hi, neo_lo
-      pos, neo_hi, neo_lo = bin.unpack(">CS", data, pos)
-      self.next_extension_offset = (neo_hi << 16) + neo_lo
-
-      local lang_tag_len
-      pos, self.xid, lang_tag_len = bin.unpack(">SS", data, pos)
-      pos, self.lang_tag = bin.unpack("A" .. lang_tag_len, data, pos)
+      self.next_extension_offset, self.xid, self.lang_tag, pos = string.unpack(">I3I2s2", data, pos)
 
       local no_urls, reserved, url_len
-      pos, self.error_code, no_urls = bin.unpack(">SS", data, pos)
+      self.error_code, no_urls, pos = string.unpack(">I2I2", data, pos)
 
       if ( no_urls > 0 ) then
-        pos, reserved, self.url_lifetime, url_len = bin.unpack(">CSS", data, pos)
-
         local num_auths
-        pos, self.url, num_auths = bin.unpack("A" .. url_len .. "C", data, pos)
+        self.url_lifetime, self.url, num_auths, pos = string.unpack(">xI2s2C", data, pos)
       end
     end,
 
@@ -118,27 +107,12 @@ Reply = {
     -- @param data string containing the raw reply as read from the socket
     parse = function(self, data)
       local pos
-      local len_hi, len_lo
 
-      pos, self.version, self.func, len_hi, len_lo = bin.unpack(">CCCS", data)
-      self.len = (len_hi << 16) + len_lo
-      pos, self.flags = bin.unpack(">S", data, pos)
-
-      local neo_hi, neo_lo
-      pos, neo_hi, neo_lo = bin.unpack(">CS", data, pos)
-      self.next_extension_offset = (neo_hi << 16) + neo_lo
-
-      local lang_tag_len
-      pos, self.xid, lang_tag_len = bin.unpack(">SS", data, pos)
-      pos, self.lang_tag = bin.unpack("A" .. lang_tag_len, data, pos)
-
-      local attrib_list_len
-      pos, self.error_code, attrib_list_len = bin.unpack(">SS", data, pos)
-
-      pos, self.attrib_list = bin.unpack("A"..attrib_list_len, data, pos)
+      self.version, self.func, self.len, pos = string.unpack(">BBI3", data)
+      self.next_extension_offset, self.xid, self.lang_tag, pos = string.unpack(">I3I2s2", data, pos)
 
       local num_auths
-      pos, num_auths = bin.unpack("C", data, pos)
+      self.error_code, self.attrib_list, num_auths, pos = string.unpack(">I2s2B", data, pos)
     end,
 
     --- Attempts to create an instance by reading data off the socket
@@ -212,15 +186,11 @@ Request = {
       local len = BASE_LEN + #self.lang_tag + self.prev_resp_list_len +
       self.slp_spi_len + #self.service_type + #self.url +
       #self.tag_list + #self.scope
-      local len_hi = ((len >> 16) & 0x00FF)
-      local len_lo = (len & 0xFFFF)
-      local neo_hi = ((self.next_extension_offset >> 16) & 0x00FF)
-      local neo_lo = (self.next_extension_offset & 0xFFFF)
 
-      local data = bin.pack(">CCCSSCSSSASSASASAS", self.version, self.func,
-        len_hi, len_lo, self.flags, neo_hi, neo_lo, self.xid, #self.lang_tag, self.lang_tag,
-        self.prev_resp_list_len, #self.url, self.url, #self.scope, self.scope,
-        #self.tag_list, self.tag_list, self.slp_spi_len)
+      local data = string.pack(">BBI3I2I3I2s2I2s2s2s2I2", self.version, self.func,
+        len, self.flags, self.next_extension_offset, self.xid, self.lang_tag,
+        self.prev_resp_list_len, self.url, self.scope,
+        self.tag_list, self.slp_spi_len)
 
       return data
     end
@@ -280,9 +250,9 @@ Request = {
       local neo_hi = ((self.next_extension_offset >> 16) & 0x00FF)
       local neo_lo = (self.next_extension_offset & 0xFFFF)
 
-      local data = bin.pack(">CCCSSCSSSASSASASS", self.version, self.func,
-        len_hi, len_lo, self.flags, neo_hi, neo_lo, self.xid, #self.lang_tag, self.lang_tag,
-        self.prev_resp_list_len, #self.service_type, self.service_type, #self.scope,
+      local data = string.pack(">BBI3I2I3I2s2I2s2s2I2I2", self.version, self.func,
+        len, self.flags, self.next_extension_offset, self.xid, self.lang_tag,
+        self.prev_resp_list_len, self.service_type,
         self.scope, self.predicate_len, self.slp_spi_len)
 
       return data