Welcome on the ML!
I don't know exactly what has been implemented in SC so far, but for sure
somebody will be able to answer this question ;).
Concerning the file transfer for MSN, AFAIK, there are 2 versions of it. At
least it was like this when I worked on this 3 years, so it might have changed
I've worked on the implementation (for another IM client) of the file transfer
which uses an external TCP connexion to transfer the data. We refered to this
file transfer as the "old file transfer" (even if I'm not sure whether or not it
was really much older than the second one). In this file transfer, an invitation
message is first sent on the switchboard (with content type: x-msmsgsinvite,
application name key set to "File Transfer" and some other fields like cookie,
filename, filesize, etc if I remember well). The two clients then agree on who
will initiate the connection (a bit like the active/passive FTP system), and the
transfer starts in a separate TCP connection (after a quick handshake in this
stream too, to avoid sending the wrong file to the wrong buddy). The blocks are
then organized in a special way I can't remember.
The other file transfer transmits the file directly on the switchboard and uses
the so-called MSNP2P protocol. It was quite messy and I must admit that I don't
remember much about it since I only helped a friend which was in charge of its
implementation. If you need more information about it, I can put you in relation
It was quite tricky to find useful information about the file transfer protocol
3 years ago, so we worked a lot by doing reverse-engineering on packet captures.
Still, there were some sources on the net which were more or less complete:
. There should be a very old draft paper from microsoft giving very little
detail on the MSN protocol.
. Refer to www.hypothetic.org . It was quite incomplete 3 years ago, but I just
took a look at it, and there seems to be much more information now.
. Maybe google a bit and try to find a website called MSN Fanatics or something
If you have any question about the MSN FT (especially the one I refer as "the
old one"), feel free to contact me.
Hope this helps :).
Selon Lamber Patrick <Patrick.Lamber@unibz.it>:
my name is Patrick Lamber. I'm a Computer Science student at the Free
University of Bolzano (Italy). I'm visiting a Programming course with
some other colleagues and form a project group where we are supposed
to take an open source project and add some functionalities to it. Our
group have chosen as open source project the Sip Communicator and as a
feature to add the file transfer between two MSN clients. Today, I saw
that you already have implemented some file transfer functionalities
for the SIP-Communicator some months ago. Now I would like to ask you,
if you could give us some advices or help how to implement the file
transfer feature for the MSN protocol.
Have a nice day
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