Packet reassemble - FTP-DATA Dissector - FTP - Export Object

["leonardocito () libero it" <leonardocito () libero it>]

I already posted this question to Ask.Wireshark.org; as I have a very tight schedule and realise the mailing list is 
more appropriate, I am posting it here as well. Please advice me if I need to remove the other post.



                                
I am implementing object export for the FTP protocol ( File-> Export Object -> FTP...).

I have got to the point of getting the list of files in the 
ExportObjectDialog window. However in such window I get an entry for 
each TCP packet used for the trasmission of each FTP packet. If save 
each entry and then join the resulting files in the correct order I get 
the file I am sopposed to. So I am on the right track but am not doing 
ftp packet reassembly correctly.

I have tried two approaches:


The one explainded in section 2.7.2
    of README.dissector.  You can find
    the code at
    pastebin.com/nkxDUhkv. In order
    to make reading easier, I have added
    left several blank lines before and
    after the reassemble section. I am
    preatty sure this is the way to go, if this is the case you can skip to the end of the question.
    However since this approach has not been
    successful, I am providing details
    of the second one.


I have followed
    the instructions given at
    https://www.wireshark.org/docs/wsdg_html_chunked/ChDissectReassemble.html#TcpDissectPdus
    and added some extra code I think
    necessary, based on implementations
    I have seen of other dissectors.

Please note that I think line



ftpdatafragmented_handle =
create_dissector_handle(dissect_ftpdatafragmented,
proto_ftpdatafragmented);

should go at the end of 

void proto_reg_handoff_ftp(void);

However for some reason such
function is not being called.
Therefore I have moved the

ftpdatafragmented_handle to 

dissect_ftpdata(tvbuff_t tvb,
packet_info pinfo, proto_tree
*tree).

Please find the relevant code at
pastebin.com/wHR2Q1LY. I have
upload the whole mofidied FTP
dissector code at
pastebin.com/jxLUxewm.


Also note that I haven't dealt with conversation and transaction data
 yet. I will deal with that as soon as I fix packet reassemble.

What am I doing wrong with packet disassemble? Could somebody please help me?

Thank you in advance for your time.

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