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pipes.c

/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   Pipe SMB reply routines
   Copyright (C) Andrew Tridgell 1992-1998
   Copyright (C) Luke Kenneth Casson Leighton 1996-1998
   Copyright (C) Paul Ashton  1997-1998.
   
   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 2 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, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
   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)

extern struct pipe_id_info pipe_names[];

/****************************************************************************
  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.
****************************************************************************/
int reply_open_pipe_and_X(connection_struct *conn,
                    char *inbuf,char *outbuf,int length,int bufsize)
{
      pstring fname;
      uint16 vuid = SVAL(inbuf, smb_uid);
      pipes_struct *p;
      int smb_ofun = SVAL(inbuf,smb_vwv8);
      int size=0,fmode=0,mtime=0,rmode=0;
      int i;

      /* XXXX we need to handle passed times, sattr and flags */
      pstrcpy(fname,smb_buf(inbuf));
      if ( strchr(fname,'?') )
            return(ERROR_DOS(ERRDOS,ERRinvalidname));

      /* 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(fname,PIPE,PIPELEN) != 0 )
            return(ERROR_DOS(ERRSRV,ERRaccess));

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

      /* See if it is one we want to handle. */
      for( i = 0; pipe_names[i].client_pipe ; i++ )
            if( strequal(fname,pipe_names[i].client_pipe) )
                  break;

      if (pipe_names[i].client_pipe == NULL)
            return(ERROR_BOTH(NT_STATUS_OBJECT_NAME_NOT_FOUND,ERRDOS,ERRbadpipe));

      /* Strip \PIPE\ off the name. */
      pstrcpy(fname,smb_buf(inbuf) + PIPELEN);

#if 0
      /*
       * Hack for NT printers... JRA.
       */
    if(should_fail_next_srvsvc_open(fname))
      return(ERROR_DOS(ERRSRV,ERRaccess));
#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));
      smb_ofun |= FILE_CREATE_IF_NOT_EXIST;

      p = open_rpc_pipe_p(fname, conn, vuid);
      if (!p) return(ERROR_DOS(ERRSRV,ERRnofids));

      /* Prepare the reply */
      set_message(outbuf,15,0,True);

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

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

      SSVAL(outbuf,smb_vwv2, p->pnum);
      SSVAL(outbuf,smb_vwv3,fmode);
      put_dos_date3(outbuf,smb_vwv4,mtime);
      SIVAL(outbuf,smb_vwv6,size);
      SSVAL(outbuf,smb_vwv8,rmode);
      SSVAL(outbuf,smb_vwv11,0x0001);

      return chain_reply(inbuf,outbuf,length,bufsize);
}

/****************************************************************************
  reply to a write on a pipe
****************************************************************************/
int reply_pipe_write(char *inbuf,char *outbuf,int length,int dum_bufsize)
{
      pipes_struct *p = get_rpc_pipe_p(inbuf,smb_vwv0);
      size_t numtowrite = SVAL(inbuf,smb_vwv1);
      int nwritten;
      int outsize;
      char *data;

      if (!p)
            return(ERROR_DOS(ERRDOS,ERRbadfid));

      data = smb_buf(inbuf) + 3;

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

      if ((nwritten == 0 && numtowrite != 0) || (nwritten < 0))
            return (UNIXERROR(ERRDOS,ERRnoaccess));
  
      outsize = set_message(outbuf,1,0,True);

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

      return(outsize);
}

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

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

int reply_pipe_write_and_X(char *inbuf,char *outbuf,int length,int bufsize)
{
      pipes_struct *p = get_rpc_pipe_p(inbuf,smb_vwv2);
      size_t numtowrite = SVAL(inbuf,smb_vwv10);
      int nwritten = -1;
      int smb_doff = SVAL(inbuf, smb_vwv11);
      BOOL pipe_start_message_raw = ((SVAL(inbuf, smb_vwv7) & (PIPE_START_MESSAGE|PIPE_RAW_MODE)) ==
                                                      (PIPE_START_MESSAGE|PIPE_RAW_MODE));
      char *data;

      if (!p)
            return(ERROR_DOS(ERRDOS,ERRbadfid));

      data = smb_base(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 ));
                        return (UNIXERROR(ERRDOS,ERRnoaccess));
                  }

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

      if ((nwritten == 0 && numtowrite != 0) || (nwritten < 0))
            return (UNIXERROR(ERRDOS,ERRnoaccess));
  
      set_message(outbuf,6,0,True);

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

      return chain_reply(inbuf,outbuf,length,bufsize);
}

/****************************************************************************
  reply to a read and X

  This code is basically stolen from reply_read_and_X with some
  wrinkles to handle pipes.
****************************************************************************/
int reply_pipe_read_and_X(char *inbuf,char *outbuf,int length,int bufsize)
{
      pipes_struct *p = get_rpc_pipe_p(inbuf,smb_vwv2);
      int smb_maxcnt = SVAL(inbuf,smb_vwv5);
      int smb_mincnt = SVAL(inbuf,smb_vwv6);
      int nread = -1;
      char *data;
      /* 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(inbuf,smb_vwv3);
#endif

      if (!p)
            return(ERROR_DOS(ERRDOS,ERRbadfid));

      set_message(outbuf,12,0,True);
      data = smb_buf(outbuf);

      nread = read_from_pipe(p, data, smb_maxcnt);

      if (nread < 0)
            return(UNIXERROR(ERRDOS,ERRnoaccess));
  
      SSVAL(outbuf,smb_vwv5,nread);
      SSVAL(outbuf,smb_vwv6,smb_offset(data,outbuf));
      SSVAL(smb_buf(outbuf),-2,nread);
  
      DEBUG(3,("readX-IPC pnum=%04x min=%d max=%d nread=%d\n",
             p->pnum, smb_mincnt, smb_maxcnt, nread));

      return chain_reply(inbuf,outbuf,length,bufsize);
}

/****************************************************************************
  reply to a close
****************************************************************************/
int reply_pipe_close(connection_struct *conn, char *inbuf,char *outbuf)
{
      pipes_struct *p = get_rpc_pipe_p(inbuf,smb_vwv0);
      int outsize = set_message(outbuf,0,0,True);

      if (!p)
            return(ERROR_DOS(ERRDOS,ERRbadfid));

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

      if (!close_rpc_pipe_hnd(p, conn))
            return(ERROR_DOS(ERRDOS,ERRbadfid));

      return(outsize);
}

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