Windows Search Protocol for samba share

Jean-Daniel FISCHER jeandaniel.fischer at
Wed Mar 20 14:43:17 MDT 2013

Hi Gregor and Jeremy,

First of all, thanks for helping me :)

@Gregor: It's seems promising and I will definitevely use it and give you
feedback as soon as I start to code the server. For now, I will focus on
declaring the named pipe in samba and forward it to external daemon.

@Jeremy: I am looking into the samba code. So far, I found the nt_open_pipe
which is the function call when a client try to open a named pipe. It calls
open_np_file, that calls np_open. At the end, this function calls
make_external_rpc_pipe_p if the pipe_mode is set

Correct me if I am wrong but that mean I need to add rpc_server:msftewds =
external into smb.conf.

In the function code, I have spotted:
socket_dir = lp_parm_const_string(
GLOBAL_SECTION_SNUM, "external_rpc_pipe", "socket_dir",
So socket_dir = /var/run/samba/socket_dir in smb.conf should set this value.

Which should lead to a /var/run/samba/socket_dir/np/msftewds file to
appear, am I right ? Because the directory is not created ?
Is it my external daemon that have to create the unix domain socket
exchange file ?

I have done some fast wireshark capture. It seems taht the pipe is not
opened with NT Create And X. It is accessed with a SMB_COM_TRANSACTION
(0x25) containing the sub command TRANS_WAIT_NMPIPE (0x0053). Smbd responds
with STATUS_NOT_SUPPORTED that is not indicated as a correct STATUS return
code for this command in MS-CIFS specification. Do you have any idea where
such smb message is handled in samba code ? If it is implemented ?

Best regards,

Jean-Daniel FISCHER

2013/3/20 Gregor Beck <gb at>

> ---------- Message transféré ----------
> From: Gregor Beck <gbeck at>
> To: samba-technical at
> Cc: Jean-Daniel FISCHER <jeandaniel.fischer at>
> Date: Wed, 20 Mar 2013 15:32:58 +0100
> Subject: Re: Windows Search Protocol for samba share
> Hi Jean-Daniel,
> I've started hacking a wireshark dissector for MS-WSP. It is far from
> complete
> but might be of some help.
> Check out:
> Any feedback is welcome ;-)
> Gregor
> Am Dienstag, 19. März 2013, 20:14:30 schrieb Jean-Daniel FISCHER:
> > Hi everyone,
> >
> > I wish to develop Windows Search Protocol (MS-WSP) support for samba
> share.
> > I have gone through the specification and I am confident it can be done.
> >
> > The protocol works on top of SMB using the named pipe MSFTEWDS according
> to
> > the specification MS provides.
> >
> > I am looking for a way to declare this named pipe into samba and make all
> > requests made on that named pipe forward to an external program.
> >
> > I have  looked over samba source code, wiki and mailing list archives
> > during the last month, I can’t find a way to do it. Is there any way to
> do
> > this ?
> >
> > Best regards,
> >
> > Jean-Daniel FISCHER

More information about the samba-technical mailing list