Potential fix for 0-length usb packets seen on OSX

[proxmark3-svn] / client / scripts / ndef_dump.lua

diff --git a/client/scripts/ndef_dump.lua b/client/scripts/ndef_dump.lua
index 1c48d19a9b71a4850e5e7e22aff03f769e10c7c6..3b27cac37b31b9e174e7a784ad51950e9694a76c 100644 (file)
--- a/client/scripts/ndef_dump.lua
+++ b/client/scripts/ndef_dump.lua
@@ -7,6 +7,14 @@ local taglib = require('taglib')
 local desc = 
 [[This script will automatically recognize and dump full content of a NFC NDEF Initialized tag; non-initialized tags will be ignored.
 
+It also write the dump to an eml-file <uid>.eml.
+
+(The difference between an .eml-file and a .bin-file is that the eml file contains
+ASCII representation of the hex-data, with linebreaks between 'rows'. A .bin-file contains the 
+raw data, but when saving into that for, we lose the infromation about how the memory is structured. 
+For example: 24 bytes could be 6 blocks of 4 bytes, or vice versa. 
+Therefore, the .eml is better to use file when saving dumps.)
+
 Arguments:
        -d                              debug logging on
        -h                              this help
@@ -14,16 +22,52 @@ Arguments:
 ]]
 local example = "script run xxx"
 local author = "Martin Holst Swende & Asper"
-
-
-
-
 ---
 -- PrintAndLog
 function prlog(...)
        -- TODO; replace this with a call to the proper PrintAndLog
        print(...)
 end
+--- 
+-- This is only meant to be used when errors occur
+function oops(err)
+       prlog("ERROR: ",err)
+       return nil,err
+end
+
+
+-- Perhaps this will be moved to a separate library at one point
+local utils = {
+       --- Writes an eml-file.
+       -- @param uid - the uid of the tag. Used in filename
+       -- @param blockData. Assumed to be on the format {'\0\1\2\3,'\b\e\e\f' ..., 
+       -- that is, blockData[row] contains a string with the actual data, not ascii hex representation 
+       -- return filename if all went well, 
+       -- @reurn nil, error message if unsuccessfull
+       writeDumpFile = function(uid, blockData)
+               local destination = string.format("%s.eml", uid)
+               local file = io.open(destination, "w")
+               if file == nil then 
+                       return nil, string.format("Could not write to file %s", destination)
+               end
+               local rowlen = string.len(blockData[1])
+
+               for i,block in ipairs(blockData) do
+                       if rowlen ~= string.len(block) then
+                               prlog(string.format("WARNING: Dumpdata seems corrupted, line %d was not the same length as line 1",i))
+                       end
+
+                       local formatString = string.format("H%d", string.len(block))
+                       local _,hex = bin.unpack(formatString,block)
+                       file:write(hex.."\n")
+               end
+               file:close()    
+               return destination
+       end,
+}
+
+
+
 --- 
 -- Usage help
 function help()
@@ -38,12 +82,6 @@ function debug(...)
        end
 end
 
---- 
--- This is only meant to be used when errors occur
-function oops(err)
-       prlog("ERROR: ",err)
-       return nil,err
-end
 
 local function show(data)
        if DEBUG then
@@ -167,7 +205,7 @@ local function main( args)
 
        -- NDEF compliant?
        if b3chars[1] ~= 0xE1 then 
-               return oops("This tag is not NDEF-Complian")
+               return oops("This tag is not NDEF-Compliant")
        end 
 
        local ndefVersion = b3chars[2]  
@@ -201,5 +239,10 @@ local function main( args)
        for k,v in ipairs(blockData) do
                prlog(string.format("Block %02x: %02x %02x %02x %02x",k-1, string.byte(v, 1,4)))
        end
+       local filename, err = utils.writeDumpFile(uidHexstr, blockData)
+       if err then return oops(err) end
+
+       prlog(string.format("Dumped data into %s", filename))
+
 end
 main(args)
\ No newline at end of file