source: branches/samba-3.3.x/source/smbd/pipes.c

/* 
   Unix SMB/CIFS implementation.
   Pipe SMB reply routines
   Copyright (C) Andrew Tridgell 1992-1998
   Copyright (C) Luke Kenneth Casson Leighton 1996-1998
   Copyright (C) Paul Ashton  1997-1998.
   Copyright (C) Jeremy Allison 2005.
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
/*
   This file handles reply_ calls on named pipes that the server
   makes to handle specific protocols
*/


#include "includes.h"

#define PIPE            "\\PIPE\\"
#define PIPELEN         strlen(PIPE)

#define MAX_PIPE_NAME_LEN       24

/* PIPE/<name>/<pid>/<pnum> */
#define PIPEDB_KEY_FORMAT "PIPE/%s/%u/%d"

struct pipe_dbrec {
        struct server_id pid;
        int pnum;
        uid_t uid;

        char name[MAX_PIPE_NAME_LEN];
        fstring user;
};

/****************************************************************************
 Reply to an open and X on a named pipe.
 This code is basically stolen from reply_open_and_X with some
 wrinkles to handle pipes.
****************************************************************************/

void reply_open_pipe_and_X(connection_struct *conn, struct smb_request *req)
{
        const char *fname = NULL;
        char *pipe_name = NULL;
        smb_np_struct *p;
        int size=0,fmode=0,mtime=0,rmode=0;
        TALLOC_CTX *ctx = talloc_tos();

        /* XXXX we need to handle passed times, sattr and flags */
        srvstr_pull_buf_talloc(ctx, req->inbuf, req->flags2, &pipe_name,
                        smb_buf(req->inbuf), STR_TERMINATE);
        if (!pipe_name) {
                reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
                                ERRDOS, ERRbadpipe);
                return;
        }

        /* If the name doesn't start \PIPE\ then this is directed */
        /* at a mailslot or something we really, really don't understand, */
        /* not just something we really don't understand. */
        if ( strncmp(pipe_name,PIPE,PIPELEN) != 0 ) {
                reply_doserror(req, ERRSRV, ERRaccess);
                return;
        }

        DEBUG(4,("Opening pipe %s.\n", pipe_name));

        /* See if it is one we want to handle. */
        if (!is_known_pipename(pipe_name)) {
                reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
                                ERRDOS, ERRbadpipe);
                return;
        }

        /* Strip \PIPE\ off the name. */
        fname = pipe_name + PIPELEN;

#if 0
        /*
         * Hack for NT printers... JRA.
         */
        if(should_fail_next_srvsvc_open(fname)) {
                reply_doserror(req, ERRSRV, ERRaccess);
                return;
        }
#endif

        /* Known pipes arrive with DIR attribs. Remove it so a regular file */
        /* can be opened and add it in after the open. */
        DEBUG(3,("Known pipe %s opening.\n",fname));

        p = open_rpc_pipe_p(fname, conn, req->vuid);
        if (!p) {
                reply_doserror(req, ERRSRV, ERRnofids);
                return;
        }

        /* Prepare the reply */
        reply_outbuf(req, 15, 0);

        /* Mark the opened file as an existing named pipe in message mode. */
        SSVAL(req->outbuf,smb_vwv9,2);
        SSVAL(req->outbuf,smb_vwv10,0xc700);

        if (rmode == 2) {
                DEBUG(4,("Resetting open result to open from create.\n"));
                rmode = 1;
        }

        SSVAL(req->outbuf,smb_vwv2, p->pnum);
        SSVAL(req->outbuf,smb_vwv3,fmode);
        srv_put_dos_date3((char *)req->outbuf,smb_vwv4,mtime);
        SIVAL(req->outbuf,smb_vwv6,size);
        SSVAL(req->outbuf,smb_vwv8,rmode);
        SSVAL(req->outbuf,smb_vwv11,0x0001);

        chain_reply(req);
        return;
}

/****************************************************************************
 Reply to a write on a pipe.
****************************************************************************/

void reply_pipe_write(struct smb_request *req)
{
        smb_np_struct *p = get_rpc_pipe_p(SVAL(req->inbuf,smb_vwv0));
        size_t numtowrite = SVAL(req->inbuf,smb_vwv1);
        int nwritten;
        char *data;

        if (!p) {
                reply_doserror(req, ERRDOS, ERRbadfid);
                return;
        }

        if (p->vuid != req->vuid) {
                reply_nterror(req, NT_STATUS_INVALID_HANDLE);
                return;
        }

        data = smb_buf(req->inbuf) + 3;

        if (numtowrite == 0) {
                nwritten = 0;
        } else {
                nwritten = write_to_pipe(p, data, numtowrite);
        }

        if ((nwritten == 0 && numtowrite != 0) || (nwritten < 0)) {
                reply_unixerror(req, ERRDOS, ERRnoaccess);
                return;
        }

        reply_outbuf(req, 1, 0);

        SSVAL(req->outbuf,smb_vwv0,nwritten);
  
        DEBUG(3,("write-IPC pnum=%04x nwritten=%d\n", p->pnum, nwritten));

        return;
}

/****************************************************************************
 Reply to a write and X.

 This code is basically stolen from reply_write_and_X with some
 wrinkles to handle pipes.
****************************************************************************/

void reply_pipe_write_and_X(struct smb_request *req)
{
        smb_np_struct *p = get_rpc_pipe_p(SVAL(req->inbuf,smb_vwv2));
        size_t numtowrite = SVAL(req->inbuf,smb_vwv10);
        int nwritten = -1;
        int smb_doff = SVAL(req->inbuf, smb_vwv11);
        bool pipe_start_message_raw =
                ((SVAL(req->inbuf, smb_vwv7)
                  & (PIPE_START_MESSAGE|PIPE_RAW_MODE))
                 == (PIPE_START_MESSAGE|PIPE_RAW_MODE));
        char *data;

        if (!p) {
                reply_doserror(req, ERRDOS, ERRbadfid);
                return;
        }

        if (p->vuid != req->vuid) {
                reply_nterror(req, NT_STATUS_INVALID_HANDLE);
                return;
        }

        data = smb_base(req->inbuf) + smb_doff;

        if (numtowrite == 0) {
                nwritten = 0;
        } else {
                if(pipe_start_message_raw) {
                        /*
                         * For the start of a message in named pipe byte mode,
                         * the first two bytes are a length-of-pdu field. Ignore
                         * them (we don't trust the client). JRA.
                         */
                       if(numtowrite < 2) {
                                DEBUG(0,("reply_pipe_write_and_X: start of "
                                         "message set and not enough data "
                                         "sent.(%u)\n",
                                         (unsigned int)numtowrite ));
                                reply_unixerror(req, ERRDOS, ERRnoaccess);
                                return;
                        }

                        data += 2;
                        numtowrite -= 2;
                }                        
                nwritten = write_to_pipe(p, data, numtowrite);
        }

        if ((nwritten == 0 && numtowrite != 0) || (nwritten < 0)) {
                reply_unixerror(req, ERRDOS,ERRnoaccess);
                return;
        }

        reply_outbuf(req, 6, 0);

        nwritten = (pipe_start_message_raw ? nwritten + 2 : nwritten);
        SSVAL(req->outbuf,smb_vwv2,nwritten);
  
        DEBUG(3,("writeX-IPC pnum=%04x nwritten=%d\n", p->pnum, nwritten));

        chain_reply(req);
}

/****************************************************************************
 Reply to a read and X.
 This code is basically stolen from reply_read_and_X with some
 wrinkles to handle pipes.
****************************************************************************/

void reply_pipe_read_and_X(struct smb_request *req)
{
        smb_np_struct *p = get_rpc_pipe_p(SVAL(req->inbuf,smb_vwv2));
        int smb_maxcnt = SVAL(req->inbuf,smb_vwv5);
        int smb_mincnt = SVAL(req->inbuf,smb_vwv6);
        int nread = -1;
        char *data;
        bool unused;

        /* we don't use the offset given to use for pipe reads. This
           is deliberate, instead we always return the next lump of
           data on the pipe */
#if 0
        uint32 smb_offs = IVAL(req->inbuf,smb_vwv3);
#endif

        if (!p) {
                reply_doserror(req, ERRDOS, ERRbadfid);
                return;
        }

        reply_outbuf(req, 12, smb_maxcnt);

        data = smb_buf(req->outbuf);

        nread = read_from_pipe(p, data, smb_maxcnt, &unused);

        if (nread < 0) {
                reply_doserror(req, ERRDOS, ERRnoaccess);
                return;
        }

        srv_set_message((char *)req->outbuf, 12, nread, False);
  
        SSVAL(req->outbuf,smb_vwv5,nread);
        SSVAL(req->outbuf,smb_vwv6,smb_offset(data,req->outbuf));
        SSVAL(smb_buf(req->outbuf),-2,nread);
  
        DEBUG(3,("readX-IPC pnum=%04x min=%d max=%d nread=%d\n",
                 p->pnum, smb_mincnt, smb_maxcnt, nread));

        chain_reply(req);
}

/****************************************************************************
 Reply to a close.
****************************************************************************/

void reply_pipe_close(connection_struct *conn, struct smb_request *req)
{
        smb_np_struct *p = get_rpc_pipe_p(SVAL(req->inbuf,smb_vwv0));

        if (!p) {
                reply_doserror(req, ERRDOS, ERRbadfid);
                return;
        }

        DEBUG(5,("reply_pipe_close: pnum:%x\n", p->pnum));

        if (!close_rpc_pipe_hnd(p)) {
                reply_doserror(req, ERRDOS, ERRbadfid);
                return;
        }
        
        /* TODO: REMOVE PIPE FROM DB */

        reply_outbuf(req, 0, 0);
        return;
}