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[Samba.git] / source / smbd / nttrans.c

/*
   Unix SMB/Netbios implementation.
   Version 1.9.
   SMB NT transaction handling
   Copyright (C) Jeremy Allison 1994-1998

   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.
*/

#include "includes.h"
#include "nterr.h"
#include "sids.h"

extern int DEBUGLEVEL;
extern int Protocol;
extern int smb_read_error;
extern int global_oplock_break;
extern BOOL case_sensitive;
extern BOOL case_preserve;
extern BOOL short_case_preserve;

static void remove_pending_change_notify_requests_by_mid(int mid);

static char *known_nt_pipes[] = {
  "\\LANMAN",
  "\\srvsvc",
  "\\samr",
  "\\wkssvc",
  "\\NETLOGON",
  "\\ntlsa",
  "\\ntsvcs",
  "\\lsass",
  "\\lsarpc",
  "\\winreg",
  "\\spoolss",
  NULL
};

/****************************************************************************
 Send the required number of replies back.
 We assume all fields other than the data fields are
 set correctly for the type of call.
 HACK ! Always assumes smb_setup field is zero.
****************************************************************************/

static int send_nt_replies(char *inbuf, char *outbuf, int bufsize, uint32 nt_error, char *params,
                           int paramsize, char *pdata, int datasize)
{
  extern int max_send;
  int data_to_send = datasize;
  int params_to_send = paramsize;
  int useable_space;
  char *pp = params;
  char *pd = pdata;
  int params_sent_thistime, data_sent_thistime, total_sent_thistime;
  int alignment_offset = 3;
  int data_alignment_offset = 0;

  /*
   * Initially set the wcnt area to be 18 - this is true for all
   * transNT replies.
   */

  set_message(outbuf,18,0,True);

  if(nt_error != 0) {
    /* NT Error. */
    SSVAL(outbuf,smb_flg2, SVAL(outbuf,smb_flg2) | FLAGS2_32_BIT_ERROR_CODES);

    ERROR(0,nt_error);
  }

  /* 
   * If there genuinely are no parameters or data to send just send
   * the empty packet.
   */

  if(params_to_send == 0 && data_to_send == 0) {
    send_smb(smbd_server_fd(),outbuf);
    return 0;
  }

  /*
   * When sending params and data ensure that both are nicely aligned.
   * Only do this alignment when there is also data to send - else
   * can cause NT redirector problems.
   */

  if (((params_to_send % 4) != 0) && (data_to_send != 0))
    data_alignment_offset = 4 - (params_to_send % 4);

  /* 
   * Space is bufsize minus Netbios over TCP header minus SMB header.
   * The alignment_offset is to align the param bytes on a four byte
   * boundary (2 bytes for data len, one byte pad). 
   * NT needs this to work correctly.
   */

  useable_space = bufsize - ((smb_buf(outbuf)+
                    alignment_offset+data_alignment_offset) -
                    outbuf);

  /*
   * useable_space can never be more than max_send minus the
   * alignment offset.
   */

  useable_space = MIN(useable_space,
                      max_send - (alignment_offset+data_alignment_offset));


  while (params_to_send || data_to_send) {

    /*
     * Calculate whether we will totally or partially fill this packet.
     */

    total_sent_thistime = params_to_send + data_to_send +
                            alignment_offset + data_alignment_offset;

    /* 
     * We can never send more than useable_space.
     */

    total_sent_thistime = MIN(total_sent_thistime, useable_space);

    set_message(outbuf, 18, total_sent_thistime, True);

    /*
     * Set total params and data to be sent.
     */

    SIVAL(outbuf,smb_ntr_TotalParameterCount,paramsize);
    SIVAL(outbuf,smb_ntr_TotalDataCount,datasize);

    /* 
     * Calculate how many parameters and data we can fit into
     * this packet. Parameters get precedence.
     */

    params_sent_thistime = MIN(params_to_send,useable_space);
    data_sent_thistime = useable_space - params_sent_thistime;
    data_sent_thistime = MIN(data_sent_thistime,data_to_send);

    SIVAL(outbuf,smb_ntr_ParameterCount,params_sent_thistime);

    if(params_sent_thistime == 0) {
      SIVAL(outbuf,smb_ntr_ParameterOffset,0);
      SIVAL(outbuf,smb_ntr_ParameterDisplacement,0);
    } else {
      /*
       * smb_ntr_ParameterOffset is the offset from the start of the SMB header to the
       * parameter bytes, however the first 4 bytes of outbuf are
       * the Netbios over TCP header. Thus use smb_base() to subtract
       * them from the calculation.
       */

      SIVAL(outbuf,smb_ntr_ParameterOffset,
            ((smb_buf(outbuf)+alignment_offset) - smb_base(outbuf)));
      /* 
       * Absolute displacement of param bytes sent in this packet.
       */

      SIVAL(outbuf,smb_ntr_ParameterDisplacement,pp - params);
    }

    /*
     * Deal with the data portion.
     */

    SIVAL(outbuf,smb_ntr_DataCount, data_sent_thistime);

    if(data_sent_thistime == 0) {
      SIVAL(outbuf,smb_ntr_DataOffset,0);
      SIVAL(outbuf,smb_ntr_DataDisplacement, 0);
    } else {
      /*
       * The offset of the data bytes is the offset of the
       * parameter bytes plus the number of parameters being sent this time.
       */

      SIVAL(outbuf,smb_ntr_DataOffset,((smb_buf(outbuf)+alignment_offset) -
            smb_base(outbuf)) + params_sent_thistime + data_alignment_offset);
      SIVAL(outbuf,smb_ntr_DataDisplacement, pd - pdata);
    }

    /* 
     * Copy the param bytes into the packet.
     */

    if(params_sent_thistime)
      memcpy((smb_buf(outbuf)+alignment_offset),pp,params_sent_thistime);

    /*
     * Copy in the data bytes
     */

    if(data_sent_thistime)
      memcpy(smb_buf(outbuf)+alignment_offset+params_sent_thistime+
             data_alignment_offset,pd,data_sent_thistime);
    
    DEBUG(9,("nt_rep: params_sent_thistime = %d, data_sent_thistime = %d, useable_space = %d\n",
          params_sent_thistime, data_sent_thistime, useable_space));
    DEBUG(9,("nt_rep: params_to_send = %d, data_to_send = %d, paramsize = %d, datasize = %d\n",
          params_to_send, data_to_send, paramsize, datasize));
    
    /* Send the packet */
    send_smb(smbd_server_fd(),outbuf);
    
    pp += params_sent_thistime;
    pd += data_sent_thistime;
    
    params_to_send -= params_sent_thistime;
    data_to_send -= data_sent_thistime;

    /*
     * Sanity check
     */

    if(params_to_send < 0 || data_to_send < 0) {
      DEBUG(0,("send_nt_replies failed sanity check pts = %d, dts = %d\n!!!",
            params_to_send, data_to_send));
      return -1;
    }
  } 

  return 0;
}

/****************************************************************************
 (Hopefully) temporary call to fix bugs in NT5.0beta2. This OS sends unicode
 strings in NT calls AND DOESN'T SET THE UNICODE BIT !!!!!!!
****************************************************************************/

static void get_filename( char *fname, char *inbuf, int data_offset, int data_len, int fname_len)
{
  /*
   * We need various heuristics here to detect a unicode string... JRA.
   */

  DEBUG(10,("get_filename: data_offset = %d, data_len = %d, fname_len = %d\n",
           data_offset, data_len, fname_len ));

  if(data_len - fname_len > 1) {
    /*
     * NT 5.0 Beta 2 has kindly sent us a UNICODE string
     * without bothering to set the unicode bit. How kind.
     *
     * Firstly - ensure that the data offset is aligned
     * on a 2 byte boundary - add one if not.
     */
    fname_len = fname_len/2;
    if(data_offset & 1)
      data_offset++;
    pstrcpy(fname, dos_unistrn2((uint16 *)(inbuf+data_offset), fname_len));
  } else {
    StrnCpy(fname,inbuf+data_offset,fname_len);
    fname[fname_len] = '\0';
  }
}

/****************************************************************************
 Fix bugs in Win2000 final release. In trans calls this OS sends unicode
 strings AND DOESN'T SET THE UNICODE BIT !!!!!!!
****************************************************************************/

static void get_filename_transact( char *fname, char *inbuf, int data_offset, int data_len, int fname_len)
{
  /*
   * We need various heuristics here to detect a unicode string... JRA.
   */

  DEBUG(10,("get_filename_transact: data_offset = %d, data_len = %d, fname_len = %d\n",
           data_offset, data_len, fname_len ));

  /*
   * Win2K sends a unicode filename plus one extra alingment byte.
   * WinNT4.x send an ascii string with multiple garbage bytes on
   * the end here.
   */

  if((data_len - fname_len == 1) || (inbuf[data_offset] == '\0')) {
    /*
     * Ensure that the data offset is aligned
     * on a 2 byte boundary - add one if not.
     */
    fname_len = fname_len/2;
    if(data_offset & 1)
      data_offset++;
    pstrcpy(fname, dos_unistrn2((uint16 *)(inbuf+data_offset), fname_len));
  } else {
    StrnCpy(fname,inbuf+data_offset,fname_len);
    fname[fname_len] = '\0';
  }
}

/****************************************************************************
 Save case statics.
****************************************************************************/

static BOOL saved_case_sensitive;
static BOOL saved_case_preserve;
static BOOL saved_short_case_preserve;

/****************************************************************************
 Save case semantics.
****************************************************************************/

static void set_posix_case_semantics(uint32 file_attributes)
{
  if(!(file_attributes & FILE_FLAG_POSIX_SEMANTICS))
    return;

  saved_case_sensitive = case_sensitive;
  saved_case_preserve = case_preserve;
  saved_short_case_preserve = short_case_preserve;

  /* Set to POSIX. */
  case_sensitive = True;
  case_preserve = True;
  short_case_preserve = True;
}

/****************************************************************************
 Restore case semantics.
****************************************************************************/

static void restore_case_semantics(uint32 file_attributes)
{
  if(!(file_attributes & FILE_FLAG_POSIX_SEMANTICS))
    return;

  case_sensitive = saved_case_sensitive;
  case_preserve = saved_case_preserve;
  short_case_preserve = saved_short_case_preserve;
}

/****************************************************************************
 Utility function to map create disposition.
****************************************************************************/

static int map_create_disposition( uint32 create_disposition)
{
  int ret;

  switch( create_disposition ) {
  case FILE_CREATE:
    /* create if not exist, fail if exist */
    ret = (FILE_CREATE_IF_NOT_EXIST|FILE_EXISTS_FAIL);
    break;
  case FILE_SUPERSEDE:
  case FILE_OVERWRITE_IF:
    /* create if not exist, trunc if exist */
    ret = (FILE_CREATE_IF_NOT_EXIST|FILE_EXISTS_TRUNCATE);
    break;
  case FILE_OPEN:
    /* fail if not exist, open if exists */
    ret = (FILE_FAIL_IF_NOT_EXIST|FILE_EXISTS_OPEN);
    break;
  case FILE_OPEN_IF:
    /* create if not exist, open if exists */
    ret = (FILE_CREATE_IF_NOT_EXIST|FILE_EXISTS_OPEN);
    break;
  case FILE_OVERWRITE:
    /* fail if not exist, truncate if exists */
    ret = (FILE_FAIL_IF_NOT_EXIST|FILE_EXISTS_TRUNCATE);
    break;
  default:
    DEBUG(0,("map_create_disposition: Incorrect value for create_disposition = %d\n",
             create_disposition ));
    return -1;
  }

  DEBUG(10,("map_create_disposition: Mapped create_disposition %lx to %x\n",
        (unsigned long)create_disposition, ret ));

  return ret;
}

/****************************************************************************
 Utility function to map share modes.
****************************************************************************/

static int map_share_mode( BOOL *pstat_open_only, char *fname,
                                                        uint32 desired_access, uint32 share_access, uint32 file_attributes)
{
  int smb_open_mode = -1;

  *pstat_open_only = False;

  switch( desired_access & (FILE_READ_DATA|FILE_WRITE_DATA|FILE_APPEND_DATA) ) {
  case FILE_READ_DATA:
    smb_open_mode = DOS_OPEN_RDONLY;
    break;
  case FILE_WRITE_DATA:
  case FILE_APPEND_DATA:
  case FILE_WRITE_DATA|FILE_APPEND_DATA:
    smb_open_mode = DOS_OPEN_WRONLY;
    break;
  case FILE_READ_DATA|FILE_WRITE_DATA:
  case FILE_READ_DATA|FILE_WRITE_DATA|FILE_APPEND_DATA:
  case FILE_READ_DATA|FILE_APPEND_DATA:
    smb_open_mode = DOS_OPEN_RDWR;
    break;
  }

  /*
   * NB. For DELETE_ACCESS we should really check the
   * directory permissions, as that is what controls
   * delete, and for WRITE_DAC_ACCESS we should really
   * check the ownership, as that is what controls the
   * chmod. Note that this is *NOT* a security hole (this
   * note is for you, Andrew) as we are not *allowing*
   * the access at this point, the actual unlink or
   * chown or chmod call would do this. We are just helping
   * clients out by telling them if they have a hope
   * of any of this succeeding. POSIX acls may still
   * deny the real call. JRA.
   */

  if (smb_open_mode == -1) {
        if(desired_access == WRITE_DAC_ACCESS || desired_access == READ_CONTROL_ACCESS)
                *pstat_open_only = True;

    if(desired_access & (DELETE_ACCESS|WRITE_DAC_ACCESS|WRITE_OWNER_ACCESS|
                              FILE_EXECUTE|FILE_READ_ATTRIBUTES|
                              FILE_READ_EA|FILE_WRITE_EA|SYSTEM_SECURITY_ACCESS|
                              FILE_WRITE_ATTRIBUTES|READ_CONTROL_ACCESS))
      smb_open_mode = DOS_OPEN_RDONLY;
    else {
      DEBUG(0,("map_share_mode: Incorrect value %lx for desired_access to file %s\n",
             (unsigned long)desired_access, fname));
      return -1;
    }
  }

  /*
   * Set the special bit that means allow share delete.
   * This is held outside the normal share mode bits at 1<<15.
   * JRA.
   */

  if(share_access & FILE_SHARE_DELETE)
    smb_open_mode |= ALLOW_SHARE_DELETE;

  /* Add in the requested share mode. */
  switch( share_access & (FILE_SHARE_READ|FILE_SHARE_WRITE)) {
  case FILE_SHARE_READ:
    smb_open_mode |= SET_DENY_MODE(DENY_WRITE);
    break;
  case FILE_SHARE_WRITE:
    smb_open_mode |= SET_DENY_MODE(DENY_READ);
    break;
  case (FILE_SHARE_READ|FILE_SHARE_WRITE):
    smb_open_mode |= SET_DENY_MODE(DENY_NONE);
    break;
  case FILE_SHARE_NONE:
    smb_open_mode |= SET_DENY_MODE(DENY_ALL);
    break;
  }

  /*
   * Handle an O_SYNC request.
   */

  if(file_attributes & FILE_FLAG_WRITE_THROUGH)
    smb_open_mode |= FILE_SYNC_OPENMODE;

  DEBUG(10,("map_share_mode: Mapped desired access %lx, share access %lx, file attributes %lx \
to open_mode %x\n", (unsigned long)desired_access, (unsigned long)share_access,
                    (unsigned long)file_attributes, smb_open_mode ));
 
  return smb_open_mode;
}


/****************************************************************************
 Reply to an NT create and X call on a pipe.
****************************************************************************/
static int nt_open_pipe(char *fname, connection_struct *conn,
                        char *inbuf, char *outbuf, int *ppnum)
{
        pipes_struct *p = NULL;
        vuser_key key;
        uint16 vuid = SVAL(inbuf, smb_uid);
        int i;

        DEBUG(4,("nt_open_pipe: Opening pipe %s.\n", fname));
    
        /* See if it is one we want to handle. */
        for( i = 0; known_nt_pipes[i]; i++ )
                if( strequal(fname,known_nt_pipes[i]))
                        break;
    
        if ( known_nt_pipes[i] == NULL )
                return(ERROR(ERRSRV,ERRaccess));
    
        /* Strip \\ off the name. */
        fname++;
    
        DEBUG(3,("nt_open_pipe: Known pipe %s opening.\n", fname));

        key.pid = getpid();
        key.vuid = vuid;
        p = open_rpc_pipe_p(fname, &key, NULL);
        if (!p)
                return(ERROR(ERRSRV,ERRnofids));

        *ppnum = p->pnum;

        return 0;
}

/****************************************************************************
 Reply to an NT create and X call.
****************************************************************************/

int reply_ntcreate_and_X(connection_struct *conn,
                         char *inbuf,char *outbuf,int length,int bufsize)
{  
        pstring fname;
        uint32 flags = IVAL(inbuf,smb_ntcreate_Flags);
        uint32 desired_access = IVAL(inbuf,smb_ntcreate_DesiredAccess);
        uint32 file_attributes = IVAL(inbuf,smb_ntcreate_FileAttributes);
        uint32 share_access = IVAL(inbuf,smb_ntcreate_ShareAccess);
        uint32 create_disposition = IVAL(inbuf,smb_ntcreate_CreateDisposition);
        uint32 create_options = IVAL(inbuf,smb_ntcreate_CreateOptions);
        uint32 fname_len = MIN(((uint32)SVAL(inbuf,smb_ntcreate_NameLength)),
                               ((uint32)sizeof(fname)-1));
        uint16 root_dir_fid = (uint16)IVAL(inbuf,smb_ntcreate_RootDirectoryFid);
        int smb_ofun;
        int smb_open_mode;
        int smb_attr = (file_attributes & SAMBA_ATTRIBUTES_MASK);
        /* Breakout the oplock request bits so we can set the
           reply bits separately. */
        int oplock_request = 0;
        mode_t unixmode;
        int pnum = -1;
        int fmode=0,rmode=0;
        SMB_OFF_T file_len = 0;
        SMB_STRUCT_STAT sbuf;
        int smb_action = 0;
        BOOL bad_path = False;
        files_struct *fsp=NULL;
        char *p = NULL;
        BOOL stat_open_only = False;

        /* 
         * We need to construct the open_and_X ofun value from the
         * NT values, as that's what our code is structured to accept.
         */    
        
        if((smb_ofun = map_create_disposition( create_disposition )) == -1)
                return(ERROR(ERRDOS,ERRbadaccess));

        /*
         * Get the file name.
         */

    if(root_dir_fid != 0) {
      /*
       * This filename is relative to a directory fid.
       */
      files_struct *dir_fsp = file_fsp(inbuf,smb_ntcreate_RootDirectoryFid);
      size_t dir_name_len;

      if(!dir_fsp)
        return(ERROR(ERRDOS,ERRbadfid));

      if(!dir_fsp->is_directory) {
        /* 
         * Check to see if this is a mac fork of some kind.
         */

        get_filename(&fname[0], inbuf, smb_buf(inbuf)-inbuf, 
                   smb_buflen(inbuf),fname_len);

        if( fname[0] == ':') {
          SSVAL(outbuf, smb_flg2, FLAGS2_32_BIT_ERROR_CODES);
          return(ERROR(0, 0xc0000000|NT_STATUS_OBJECT_PATH_NOT_FOUND));
        }
        return(ERROR(ERRDOS,ERRbadfid));
      }

      /*
       * Copy in the base directory name.
       */

      pstrcpy( fname, dir_fsp->fsp_name );
      dir_name_len = strlen(fname);

      /*
       * Ensure it ends in a '\'.
       */

      if(fname[dir_name_len-1] != '\\' && fname[dir_name_len-1] != '/') {
        pstrcat(fname, "\\");
        dir_name_len++;
      }

      /*
       * This next calculation can refuse a correct filename if we're dealing
       * with the Win2k unicode bug, but that would be rare. JRA.
       */

      if(fname_len + dir_name_len >= sizeof(pstring))
        return(ERROR(ERRSRV,ERRfilespecs));

      get_filename(&fname[dir_name_len], inbuf, smb_buf(inbuf)-inbuf, 
                   smb_buflen(inbuf),fname_len);

    } else {
      
      get_filename(fname, inbuf, smb_buf(inbuf)-inbuf, 
                   smb_buflen(inbuf),fname_len);
    }
        
        /* If it's an IPC, use the pipe handler. */

        if (IS_IPC(conn) && lp_nt_pipe_support()) {

                int ret = nt_open_pipe(fname, conn, inbuf, outbuf, &pnum);
                if(ret != 0)
                        return ret;

                /*
                 * Deal with pipe return.
                 */  

                set_message(outbuf,34,0,True);
        
                p = outbuf + smb_vwv2;
                p++;
                SSVAL(p,0,pnum);
                p += 2;
                SIVAL(p,0,FILE_WAS_OPENED);
                p += 4;
                p += 32;
                SIVAL(p,0,FILE_ATTRIBUTE_NORMAL); /* File Attributes. */
                p += 20;
                /* File type. */
                SSVAL(p,0,FILE_TYPE_MESSAGE_MODE_PIPE);
                /* Device state. */
                SSVAL(p,2, 0x5FF); /* ? */

                DEBUG(5,("reply_ntcreate_and_X: open pipe = %s\n", fname));

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

        /*
         * Now contruct the smb_open_mode value from the filename, 
     * desired access and the share access.
         */
        RESOLVE_DFSPATH(fname, conn, inbuf, outbuf);

        if((smb_open_mode = map_share_mode(&stat_open_only, fname, desired_access, 
                                           share_access, 
                                           file_attributes)) == -1)
                return(ERROR(ERRDOS,ERRbadaccess));

        oplock_request = (flags & REQUEST_OPLOCK) ? EXCLUSIVE_OPLOCK : 0;
        oplock_request |= (flags & REQUEST_BATCH_OPLOCK) ? BATCH_OPLOCK : 0;

        /*
         * Ordinary file or directory.
         */
                
        /*
         * Check if POSIX semantics are wanted.
         */
                
        set_posix_case_semantics(file_attributes);
                
        unix_convert(fname,conn,0,&bad_path,NULL);
                
        unixmode = unix_mode(conn,smb_attr | aARCH, fname);
    
        /* 
         * If it's a request for a directory open, deal with it separately.
         */

        if(create_options & FILE_DIRECTORY_FILE) {
                oplock_request = 0;
                
                fsp = open_directory(conn, fname, smb_ofun, unixmode, &smb_action);
                        
                restore_case_semantics(file_attributes);

                if(!fsp) {
                        return(UNIXERROR(ERRDOS,ERRnoaccess));
                }
        } else {
                /*
                 * Ordinary file case.
                 */

                /* NB. We have a potential bug here. If we
                 * cause an oplock break to ourselves, then we
                 * could end up processing filename related
                 * SMB requests whilst we await the oplock
                 * break response. As we may have changed the
                 * filename case semantics to be POSIX-like,
                 * this could mean a filename request could
                 * fail when it should succeed. This is a rare
                 * condition, but eventually we must arrange
                 * to restore the correct case semantics
                 * before issuing an oplock break request to
                 * our client. JRA.  */

                fsp = open_file_shared(conn,fname,smb_open_mode,
                                 smb_ofun,unixmode, oplock_request,&rmode,&smb_action);

                if (!fsp) { 
                        /* We cheat here. There are two cases we
                         * care about. One is a directory rename,
                         * where the NT client will attempt to
                         * open the source directory for
                         * DELETE access. Note that when the
                         * NT client does this it does *not*
                         * set the directory bit in the
                         * request packet. This is translated
                         * into a read/write open
                         * request. POSIX states that any open
                         * for write request on a directory
                         * will generate an EISDIR error, so
                         * we can catch this here and open a
                         * pseudo handle that is flagged as a
                         * directory. The second is an open
                         * for a permissions read only, which
                         * we handle in the open_file_stat case. JRA.
                         */

                        if(errno == EISDIR) {

                                /*
                                 * Fail the open if it was explicitly a non-directory file.
                                 */

                                if (create_options & FILE_NON_DIRECTORY_FILE) {
                                        restore_case_semantics(file_attributes);
                                        SSVAL(outbuf, smb_flg2, FLAGS2_32_BIT_ERROR_CODES);
                                        return(ERROR(0, 0xc0000000|NT_STATUS_FILE_IS_A_DIRECTORY));
                                }
        
                                oplock_request = 0;
                                fsp = open_directory(conn, fname, smb_ofun, unixmode, &smb_action);
                                
                                if(!fsp) {
                                        restore_case_semantics(file_attributes);
                                        return(UNIXERROR(ERRDOS,ERRnoaccess));
                                }
#ifdef EROFS
                        } else if (((errno == EACCES) || (errno == EROFS)) && stat_open_only) {
#else /* !EROFS */
                        } else if (errno == EACCES && stat_open_only) {
#endif
                                /*
                                 * We couldn't open normally and all we want
                                 * are the permissions. Try and do a stat open.
                                 */

                                oplock_request = 0;

                                fsp = open_file_stat(conn,fname,smb_open_mode,&sbuf,&smb_action);

                                if(!fsp) {
                                        restore_case_semantics(file_attributes);
                                        return(UNIXERROR(ERRDOS,ERRnoaccess));
                                }

                        } else {

                                if((errno == ENOENT) && bad_path) {
                                        unix_ERR_class = ERRDOS;
                                        unix_ERR_code = ERRbadpath;
                                }
                                
                                restore_case_semantics(file_attributes);
                                
                                return(UNIXERROR(ERRDOS,ERRnoaccess));
                        }
                } 
        }
                
        if(fsp->is_directory) {
                if(conn->vfs_ops.stat(dos_to_unix(fsp->fsp_name, False), &sbuf) != 0) {
                        close_file(fsp,True);
                        restore_case_semantics(file_attributes);
                        return(ERROR(ERRDOS,ERRnoaccess));
                }
        } else {
                if (conn->vfs_ops.fstat(fsp->fd,&sbuf) != 0) {
                        close_file(fsp,False);
                        restore_case_semantics(file_attributes);
                        return(ERROR(ERRDOS,ERRnoaccess));
                } 
        }
                
        restore_case_semantics(file_attributes);
                
        file_len = sbuf.st_size;
        fmode = dos_mode(conn,fname,&sbuf);
        if(fmode == 0)
                fmode = FILE_ATTRIBUTE_NORMAL;
        if (!fsp->is_directory && (fmode & aDIR)) {
                close_file(fsp,False);
                return(ERROR(ERRDOS,ERRnoaccess));
        } 
        
        /* 
         * If the caller set the extended oplock request bit
         * and we granted one (by whatever means) - set the
         * correct bit for extended oplock reply.
         */
        
        if (oplock_request && lp_fake_oplocks(SNUM(conn)))
                smb_action |= EXTENDED_OPLOCK_GRANTED;
        
        if(oplock_request && EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type))
                smb_action |= EXTENDED_OPLOCK_GRANTED;

        set_message(outbuf,34,0,True);
        
        p = outbuf + smb_vwv2;
        
        /*
         * Currently as we don't support level II oplocks we just report
         * exclusive & batch here.
         */

    if (smb_action & EXTENDED_OPLOCK_GRANTED)   
                SCVAL(p,0, BATCH_OPLOCK_RETURN);
        else if (LEVEL_II_OPLOCK_TYPE(fsp->oplock_type))
        SCVAL(p,0, LEVEL_II_OPLOCK_RETURN);
        else
                SCVAL(p,0,NO_OPLOCK_RETURN);
        
        p++;
        SSVAL(p,0,fsp->fnum);
        p += 2;
        SIVAL(p,0,smb_action);
        p += 4;
        
        /* Create time. */  
        put_long_date(p,get_create_time(&sbuf,lp_fake_dir_create_times(SNUM(conn))));
        p += 8;
        put_long_date(p,sbuf.st_atime); /* access time */
        p += 8;
        put_long_date(p,sbuf.st_mtime); /* write time */
        p += 8;
        put_long_date(p,sbuf.st_mtime); /* change time */
        p += 8;
        SIVAL(p,0,fmode); /* File Attributes. */
        p += 4;
        SOFF_T(p, 0, file_len);
        p += 8;
        SOFF_T(p,0,file_len);
        p += 12;
        SCVAL(p,0,fsp->is_directory ? 1 : 0);
        
        DEBUG(5,("reply_ntcreate_and_X: fnum = %d, open name = %s\n", fsp->fnum, fsp->fsp_name));

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

/****************************************************************************
 Reply to a NT_TRANSACT_CREATE call (needs to process SD's).
****************************************************************************/

static int call_nt_transact_create(connection_struct *conn,
                                        char *inbuf, char *outbuf, int length, 
                                        int bufsize, char **ppsetup, char **ppparams, 
                                        char **ppdata)
{
  pstring fname;
  char *params = *ppparams;
  int total_parameter_count = (int)IVAL(inbuf, smb_nt_TotalParameterCount);
  /* Breakout the oplock request bits so we can set the
     reply bits separately. */
  int oplock_request = 0;
  mode_t unixmode;
  int pnum = -1;
  int fmode=0,rmode=0;
  SMB_OFF_T file_len = 0;
  SMB_STRUCT_STAT sbuf;
  int smb_action = 0;
  BOOL bad_path = False;
  files_struct *fsp = NULL;
  char *p = NULL;
  BOOL stat_open_only = False;
  uint32 flags;
  uint32 desired_access;
  uint32 file_attributes;
  uint32 share_access;
  uint32 create_disposition;
  uint32 create_options;
  uint32 fname_len;
  uint16 root_dir_fid;
  int smb_ofun;
  int smb_open_mode;
  int smb_attr;

  DEBUG(5,("call_nt_transact_create\n"));

  /*
   * Ensure minimum number of parameters sent.
   */

  if(total_parameter_count < 54) {
    DEBUG(0,("call_nt_transact_create - insufficient parameters (%u)\n", (unsigned int)total_parameter_count));
    return(ERROR(ERRDOS,ERRbadaccess));
  }

  flags = IVAL(params,0);
  desired_access = IVAL(params,8);
  file_attributes = IVAL(params,20);
  share_access = IVAL(params,24);
  create_disposition = IVAL(params,28);
  create_options = IVAL(params,32);
  fname_len = MIN(((uint32)IVAL(params,44)),((uint32)sizeof(fname)-1));
  root_dir_fid = (uint16)IVAL(params,4);
  smb_attr = (file_attributes & SAMBA_ATTRIBUTES_MASK);

  /* 
   * We need to construct the open_and_X ofun value from the
   * NT values, as that's what our code is structured to accept.
   */    

  if((smb_ofun = map_create_disposition( create_disposition )) == -1)
    return(ERROR(ERRDOS,ERRbadmem));

  /*
   * Get the file name.
   */

  if(root_dir_fid != 0) {
    /*
     * This filename is relative to a directory fid.
     */

    files_struct *dir_fsp = file_fsp(params,4);
    size_t dir_name_len;

    if(!dir_fsp)
        return(ERROR(ERRDOS,ERRbadfid));

    if(!dir_fsp->is_directory) {
      /*
       * Check to see if this is a mac fork of some kind.
       */

      get_filename_transact(&fname[0], params, 53,
                            total_parameter_count - 53 - fname_len, fname_len);

      if( fname[0] == ':') {
          SSVAL(outbuf, smb_flg2, FLAGS2_32_BIT_ERROR_CODES);
          return(ERROR(0, 0xc0000000|NT_STATUS_OBJECT_PATH_NOT_FOUND));
      }

      return(ERROR(ERRDOS,ERRbadfid));
    }

    /*
     * Copy in the base directory name.
     */

    pstrcpy( fname, dir_fsp->fsp_name );
    dir_name_len = strlen(fname);

    /*
     * Ensure it ends in a '\'.
     */

    if((fname[dir_name_len-1] != '\\') && (fname[dir_name_len-1] != '/')) {
      pstrcat(fname, "\\");
      dir_name_len++;
    }

    /*
     * This next calculation can refuse a correct filename if we're dealing
     * with the Win2k unicode bug, but that would be rare. JRA.
     */

    if(fname_len + dir_name_len >= sizeof(pstring))
      return(ERROR(ERRSRV,ERRfilespecs));

    get_filename_transact(&fname[dir_name_len], params, 53,
                 total_parameter_count - 53 - fname_len, fname_len);

  } else {
    get_filename_transact(&fname[0], params, 53,
                 total_parameter_count - 53 - fname_len, fname_len);
  }

  /* If it's an IPC, use the pipe handler. */
  if (IS_IPC(conn)) {
    int ret = nt_open_pipe(fname, conn, inbuf, outbuf, &pnum);
    if(ret != 0)
      return ret;
    smb_action = FILE_WAS_OPENED;
  } else {

    /*
     * Now contruct the smb_open_mode value from the desired access
     * and the share access.
     */

    if((smb_open_mode = map_share_mode( &stat_open_only, fname, desired_access,
                                        share_access, file_attributes)) == -1)
      return(ERROR(ERRDOS,ERRbadaccess));

    oplock_request = (flags & REQUEST_OPLOCK) ? EXCLUSIVE_OPLOCK : 0;
    oplock_request |= (flags & REQUEST_BATCH_OPLOCK) ? BATCH_OPLOCK : 0;

    /*
     * Check if POSIX semantics are wanted.
     */

    set_posix_case_semantics(file_attributes);
    
    RESOLVE_DFSPATH(fname, conn, inbuf, outbuf);

    unix_convert(fname,conn,0,&bad_path,NULL);
    
    unixmode = unix_mode(conn,smb_attr | aARCH, fname);
    
    /*
     * If it's a request for a directory open, deal with it separately.
     */

    if(create_options & FILE_DIRECTORY_FILE) {

      oplock_request = 0;

      /*
       * We will get a create directory here if the Win32
       * app specified a security descriptor in the 
       * CreateDirectory() call.
       */

      fsp = open_directory(conn, fname, smb_ofun, unixmode, &smb_action);

      if(!fsp) {
        restore_case_semantics(file_attributes);
        return(UNIXERROR(ERRDOS,ERRnoaccess));
      }

      if(conn->vfs_ops.stat(dos_to_unix(fsp->fsp_name, False),
                             &sbuf) != 0) {
        close_file(fsp,True);
        restore_case_semantics(file_attributes);
        return(ERROR(ERRDOS,ERRnoaccess));
      }

    } else {

      /*
       * Ordinary file case.
       */

      fsp = open_file_shared(conn,fname,smb_open_mode,smb_ofun,unixmode,
                       oplock_request,&rmode,&smb_action);

      if (!fsp) { 

                if(errno == EISDIR) {

                        /*
                         * Fail the open if it was explicitly a non-directory file.
                         */

                        if (create_options & FILE_NON_DIRECTORY_FILE) {
                                restore_case_semantics(file_attributes);
                                SSVAL(outbuf, smb_flg2, FLAGS2_32_BIT_ERROR_CODES);
                                return(ERROR(0, 0xc0000000|NT_STATUS_FILE_IS_A_DIRECTORY));
                        }
        
                        oplock_request = 0;
                        fsp = open_directory(conn, fname, smb_ofun, unixmode, &smb_action);
                                
                        if(!fsp) {
                                restore_case_semantics(file_attributes);
                                return(UNIXERROR(ERRDOS,ERRnoaccess));
                        }
#ifdef EROFS
                } else if (((errno == EACCES) || (errno == EROFS)) && stat_open_only) {
#else /* !EROFS */
                } else if (errno == EACCES && stat_open_only) {
#endif

                        /*
                         * We couldn't open normally and all we want
                         * are the permissions. Try and do a stat open.
                         */

                        oplock_request = 0;

                        fsp = open_file_stat(conn,fname,smb_open_mode,&sbuf,&smb_action);

                        if(!fsp) {
                                restore_case_semantics(file_attributes);
                                return(UNIXERROR(ERRDOS,ERRnoaccess));
                        }
                } else {

                        if((errno == ENOENT) && bad_path) {
                                unix_ERR_class = ERRDOS;
                                unix_ERR_code = ERRbadpath;
                        }

                        restore_case_semantics(file_attributes);

                        return(UNIXERROR(ERRDOS,ERRnoaccess));
                }
      } 
  
      if(fsp->is_directory) {
          if(conn->vfs_ops.stat(dos_to_unix(fsp->fsp_name,False), &sbuf) != 0) {
              close_file(fsp,True);
              restore_case_semantics(file_attributes);
              return(ERROR(ERRDOS,ERRnoaccess));
          }
      } else {
          if (!fsp->stat_open && conn->vfs_ops.fstat(fsp->fd,&sbuf) != 0) {
              close_file(fsp,False);
              restore_case_semantics(file_attributes);
              return(ERROR(ERRDOS,ERRnoaccess));
          } 
      }
 
      file_len = sbuf.st_size;
      fmode = dos_mode(conn,fname,&sbuf);
      if(fmode == 0)
        fmode = FILE_ATTRIBUTE_NORMAL;

      if (fmode & aDIR) {
        close_file(fsp,False);
        restore_case_semantics(file_attributes);
        return(ERROR(ERRDOS,ERRnoaccess));
      } 

      /* 
       * If the caller set the extended oplock request bit
       * and we granted one (by whatever means) - set the
       * correct bit for extended oplock reply.
       */
    
      if (oplock_request && lp_fake_oplocks(SNUM(conn)))
        smb_action |= EXTENDED_OPLOCK_GRANTED;
  
      if(oplock_request && EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type))
        smb_action |= EXTENDED_OPLOCK_GRANTED;
    }
  }

  restore_case_semantics(file_attributes);

  /* Realloc the size of parameters and data we will return */
  params = *ppparams = Realloc(*ppparams, 69);
  if(params == NULL)
    return(ERROR(ERRDOS,ERRnomem));

  memset((char *)params,'\0',69);

  p = params;
  if (smb_action & EXTENDED_OPLOCK_GRANTED)     
        SCVAL(p,0, BATCH_OPLOCK_RETURN);
  else if (LEVEL_II_OPLOCK_TYPE(fsp->oplock_type))
    SCVAL(p,0, LEVEL_II_OPLOCK_RETURN);
  else
        SCVAL(p,0,NO_OPLOCK_RETURN);
        
  p += 2;
  if (IS_IPC(conn)) {
          SSVAL(p,0,pnum);
  } else {
          SSVAL(p,0,fsp->fnum);
  }
  p += 2;
  SIVAL(p,0,smb_action);
  p += 8;

  if (IS_IPC(conn)) {
    /*
     * Deal with pipe return.
     */  
    p += 32;
    SIVAL(p,0,FILE_ATTRIBUTE_NORMAL); /* File Attributes. */
    p += 20;
    /* File type. */
    SSVAL(p,0,FILE_TYPE_MESSAGE_MODE_PIPE);
    /* Device state. */
    SSVAL(p,2, 0x5FF); /* ? */
  } else {
    /*
     * Deal with file return.
     */
    /* Create time. */
    put_long_date(p,get_create_time(&sbuf,lp_fake_dir_create_times(SNUM(conn))));
    p += 8;
    put_long_date(p,sbuf.st_atime); /* access time */
    p += 8;
    put_long_date(p,sbuf.st_mtime); /* write time */
    p += 8;
    put_long_date(p,sbuf.st_mtime); /* change time */
    p += 8;
    SIVAL(p,0,fmode); /* File Attributes. */
    p += 4;
    SOFF_T(p,0,file_len);
    p += 8;
    SOFF_T(p,0,file_len);
  }

  DEBUG(5,("call_nt_transact_create: open name = %s\n", fname));

  /* Send the required number of replies */
  send_nt_replies(inbuf, outbuf, bufsize, 0, params, 69, *ppdata, 0);

  return -1;
}

/****************************************************************************
 Reply to a NT CANCEL request.
****************************************************************************/
int reply_ntcancel(connection_struct *conn,
                   char *inbuf,char *outbuf,int length,int bufsize)
{
        /*
         * Go through and cancel any pending change notifies.
         */
        
        int mid = SVAL(inbuf,smb_mid);
        remove_pending_change_notify_requests_by_mid(mid);
        remove_pending_lock_requests_by_mid(mid);
        
        DEBUG(3,("reply_ntcancel: cancel called on mid = %d.\n", mid));

        return(-1);
}

/****************************************************************************
 Reply to an unsolicited SMBNTtranss - just ignore it!
****************************************************************************/
int reply_nttranss(connection_struct *conn,
                   char *inbuf,char *outbuf,int length,int bufsize)
{
        DEBUG(4,("Ignoring nttranss of length %d\n",length));
        return(-1);
}

/****************************************************************************
 Reply to an NT transact rename command.
****************************************************************************/

static int call_nt_transact_rename(connection_struct *conn,
                                   char *inbuf, char *outbuf, int length, 
                                   int bufsize,
                                   char **ppsetup, char **ppparams, char **ppdata)
{
  char *params = *ppparams;
  pstring new_name;
  files_struct *fsp = file_fsp(params, 0);
  BOOL replace_if_exists = (SVAL(params,2) & RENAME_REPLACE_IF_EXISTS) ? True : False;
  uint32 fname_len = MIN((((uint32)IVAL(inbuf,smb_nt_TotalParameterCount)-4)),
                         ((uint32)sizeof(new_name)-1));
  int outsize = 0;

  CHECK_FSP(fsp, conn);
  StrnCpy(new_name,params+4,fname_len);
  new_name[fname_len] = '\0';

  outsize = rename_internals(conn, inbuf, outbuf, fsp->fsp_name,
                             new_name, replace_if_exists);
  if(outsize == 0) {
    /*
     * Rename was successful.
     */
    send_nt_replies(inbuf, outbuf, bufsize, 0, NULL, 0, NULL, 0);

    DEBUG(3,("nt transact rename from = %s, to = %s succeeded.\n", 
          fsp->fsp_name, new_name));

    outsize = -1;
  }

  return(outsize);
}
   
/****************************************************************************
 This is the structure to keep the information needed to
 determine if a directory has changed.
*****************************************************************************/

typedef struct {
  time_t modify_time; /* Info from the directory we're monitoring. */ 
  time_t status_time; /* Info from the directory we're monitoring. */
  time_t total_time; /* Total time of all directory entries - don't care if it wraps. */
  unsigned int num_entries; /* Zero or the number of files in the directory. */
} change_hash_data;

/****************************************************************************
 This is the structure to queue to implement NT change
 notify. It consists of smb_size bytes stored from the
 transact command (to keep the mid, tid etc around).
 Plus the fid to examine and the time to check next.
*****************************************************************************/

typedef struct {
  ubi_slNode msg_next;
  files_struct *fsp;
  connection_struct *conn;
  uint32 flags;
  time_t next_check_time;
  change_hash_data change_data;
  char request_buf[smb_size];
} change_notify_buf;

static ubi_slList change_notify_queue = { NULL, (ubi_slNodePtr)&change_notify_queue, 0};

/****************************************************************************
 Setup the common parts of the return packet and send it.
*****************************************************************************/

static void change_notify_reply_packet(char *inbuf, int error_class, uint32 error_code)
{
  char outbuf[smb_size+38];

  memset(outbuf, '\0', sizeof(outbuf));
  construct_reply_common(inbuf, outbuf);

  /*
   * If we're returning a 'too much in the directory changed' we need to
   * set this is an NT error status flags. If we don't then the (probably
   * untested) code in the NT redirector has a bug in that it doesn't re-issue
   * the change notify.... Ah - I *love* it when I get so deeply into this I
   * can even determine how MS failed to test stuff and why.... :-). JRA.
   */

  if(error_class == 0) /* NT Error. */
    SSVAL(outbuf,smb_flg2, SVAL(outbuf,smb_flg2) | FLAGS2_32_BIT_ERROR_CODES);

  ERROR(error_class,error_code);

  /*
   * Seems NT needs a transact command with an error code
   * in it. This is a longer packet than a simple error.
   */
  set_message(outbuf,18,0,False);

  send_smb(smbd_server_fd(),outbuf);
}

/****************************************************************************
 Create the hash we will use to determine if the contents changed.
*****************************************************************************/

static BOOL create_directory_notify_hash( change_notify_buf *cnbp, change_hash_data *change_data)
{
  SMB_STRUCT_STAT st;
  files_struct *fsp = cnbp->fsp;

  memset((char *)change_data, '\0', sizeof(change_data));

  /* 
   * Store the current timestamp on the directory we are monitoring.
   */

  if(dos_stat(fsp->fsp_name, &st) < 0) {
    DEBUG(0,("create_directory_notify_hash: Unable to stat name = %s. \
Error was %s\n", fsp->fsp_name, strerror(errno) ));
    return False;
  }
 
  change_data->modify_time = st.st_mtime;
  change_data->status_time = st.st_ctime;

  /*
   * If we are to watch for changes that are only stored
   * in inodes of files, not in the directory inode, we must
   * scan the directory and produce a unique identifier with
   * which we can determine if anything changed. We use the
   * modify and change times from all the files in the
   * directory, added together (ignoring wrapping if it's
   * larger than the max time_t value).
   */

  if(cnbp->flags & (FILE_NOTIFY_CHANGE_SIZE|FILE_NOTIFY_CHANGE_LAST_WRITE)) {
    pstring full_name;
    char *p;
    char *fname;
    size_t remaining_len;
    size_t fullname_len;
    void *dp = OpenDir(cnbp->conn, fsp->fsp_name, True);

    if(dp == NULL) {
      DEBUG(0,("create_directory_notify_hash: Unable to open directory = %s. \
Error was %s\n", fsp->fsp_name, strerror(errno) ));
      return False;
    }

    change_data->num_entries = 0;

    pstrcpy(full_name, fsp->fsp_name);
    pstrcat(full_name, "/");

    fullname_len = strlen(full_name);
    remaining_len = sizeof(full_name) - fullname_len - 1;
    p = &full_name[fullname_len];

    while ((fname = ReadDirName(dp))) {
      if(strequal(fname, ".") || strequal(fname, ".."))
        continue;

      change_data->num_entries++;
      safe_strcpy( p, fname, remaining_len);

      memset(&st, '\0', sizeof(st));

      /*
       * Do the stat - but ignore errors.
       */

      if(dos_stat(full_name, &st) < 0) {
        DEBUG(5,("create_directory_notify_hash: Unable to stat content file = %s. \
Error was %s\n", fsp->fsp_name, strerror(errno) ));
      }
      change_data->total_time += (st.st_mtime + st.st_ctime);
    }

    CloseDir(dp);
  }

  return True;
}

/****************************************************************************
 Delete entries by fnum from the change notify pending queue.
*****************************************************************************/

void remove_pending_change_notify_requests_by_fid(files_struct *fsp)
{
  change_notify_buf *cnbp = (change_notify_buf *)ubi_slFirst( &change_notify_queue );
  change_notify_buf *prev = NULL;

  while(cnbp != NULL) {
    if(cnbp->fsp->fnum == fsp->fnum) {
      free((char *)ubi_slRemNext( &change_notify_queue, prev));
      cnbp = (change_notify_buf *)(prev ? ubi_slNext(prev) : ubi_slFirst(&change_notify_queue));
      continue;
    }

    prev = cnbp;
    cnbp = (change_notify_buf *)ubi_slNext(cnbp);
  }
}

/****************************************************************************
 Delete entries by mid from the change notify pending queue. Always send reply.
*****************************************************************************/

static void remove_pending_change_notify_requests_by_mid(int mid)
{
  change_notify_buf *cnbp = (change_notify_buf *)ubi_slFirst( &change_notify_queue );
  change_notify_buf *prev = NULL;

  while(cnbp != NULL) {
    if(SVAL(cnbp->request_buf,smb_mid) == mid) {
      change_notify_reply_packet(cnbp->request_buf,0,NT_STATUS_CANCELLED);
      free((char *)ubi_slRemNext( &change_notify_queue, prev));
      cnbp = (change_notify_buf *)(prev ? ubi_slNext(prev) : ubi_slFirst(&change_notify_queue));
      continue;
    }

    prev = cnbp;
    cnbp = (change_notify_buf *)ubi_slNext(cnbp);
  }
}

/****************************************************************************
 Delete entries by filename and cnum from the change notify pending queue.
 Always send reply.
*****************************************************************************/

void remove_pending_change_notify_requests_by_filename(files_struct *fsp)
{
  change_notify_buf *cnbp = (change_notify_buf *)ubi_slFirst( &change_notify_queue );
  change_notify_buf *prev = NULL;

  while(cnbp != NULL) {
    /*
     * We know it refers to the same directory if the connection number and
     * the filename are identical.
     */
    if((cnbp->fsp->conn == fsp->conn) && strequal(cnbp->fsp->fsp_name,fsp->fsp_name)) {
      change_notify_reply_packet(cnbp->request_buf,0,NT_STATUS_CANCELLED);
      free((char *)ubi_slRemNext( &change_notify_queue, prev));
      cnbp = (change_notify_buf *)(prev ? ubi_slNext(prev) : ubi_slFirst(&change_notify_queue));
      continue;
    }

    prev = cnbp;
    cnbp = (change_notify_buf *)ubi_slNext(cnbp);
  }
}

/****************************************************************************
 Process the change notify queue. Note that this is only called as root.
 Returns True if there are still outstanding change notify requests on the
 queue.
*****************************************************************************/

BOOL process_pending_change_notify_queue(time_t t)
{
  change_notify_buf *cnbp = (change_notify_buf *)ubi_slFirst( &change_notify_queue );
  change_notify_buf *prev = NULL;

  if(cnbp == NULL)
    return False;

  if(cnbp->next_check_time >= t)
    return True;

  /*
   * It's time to check. Go through the queue and see if
   * the timestamps changed.
   */

  while((cnbp != NULL) && (cnbp->next_check_time <= t)) {
    change_hash_data change_data;
    connection_struct *conn = cnbp->conn;
    uint16 vuid = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID : 
                  SVAL(cnbp->request_buf,smb_uid);

    ZERO_STRUCT(change_data);

    /*
     * Ensure we don't have any old chain_fsp values
     * sitting around....
     */
    chain_size = 0;
    file_chain_reset();

    if(!become_user(conn,vuid)) {
      DEBUG(0,("process_pending_change_notify_queue: Unable to become user vuid=%d.\n",
            vuid ));
      /*
       * Remove the entry and return an error to the client.
       */
      change_notify_reply_packet(cnbp->request_buf,ERRSRV,ERRaccess);
      free((char *)ubi_slRemNext( &change_notify_queue, prev));
      cnbp = (change_notify_buf *)(prev ? ubi_slNext(prev) : ubi_slFirst(&change_notify_queue));
      continue;
    }

    if(!become_service(conn,True)) {
            DEBUG(0,("process_pending_change_notify_queue: Unable to become service Error was %s.\n", strerror(errno) ));
      /*
       * Remove the entry and return an error to the client.
       */
      change_notify_reply_packet(cnbp->request_buf,ERRSRV,ERRaccess);
      free((char *)ubi_slRemNext( &change_notify_queue, prev));
      cnbp = (change_notify_buf *)(prev ? ubi_slNext(prev) : ubi_slFirst(&change_notify_queue));
      unbecome_user();
      continue;
    }

    if(!create_directory_notify_hash( cnbp, &change_data)) {
      DEBUG(0,("process_pending_change_notify_queue: Unable to create change data for \
directory %s\n", cnbp->fsp->fsp_name ));
      /*
       * Remove the entry and return an error to the client.
       */
      change_notify_reply_packet(cnbp->request_buf,ERRSRV,ERRaccess);
      free((char *)ubi_slRemNext( &change_notify_queue, prev));
      cnbp = (change_notify_buf *)(prev ? ubi_slNext(prev) : ubi_slFirst(&change_notify_queue));
      unbecome_user();
      continue;
    }

    if(memcmp( (char *)&cnbp->change_data, (char *)&change_data, sizeof(change_data))) {
      /*
       * Remove the entry and return a change notify to the client.
       */
      DEBUG(5,("process_pending_change_notify_queue: directory name = %s changed.\n",
            cnbp->fsp->fsp_name ));
      change_notify_reply_packet(cnbp->request_buf,0,NT_STATUS_NOTIFY_ENUM_DIR);
      free((char *)ubi_slRemNext( &change_notify_queue, prev));
      cnbp = (change_notify_buf *)(prev ? ubi_slNext(prev) : ubi_slFirst(&change_notify_queue));
      unbecome_user();
      continue;
    }

    unbecome_user();

    /*
     * Move to the next in the list.
     */
    prev = cnbp;
    cnbp = (change_notify_buf *)ubi_slNext(cnbp);
  }

  return (cnbp != NULL);
}

/****************************************************************************
 Return true if there are pending change notifies.
****************************************************************************/

BOOL change_notifies_pending(void)
{
  change_notify_buf *cnbp = (change_notify_buf *)ubi_slFirst( &change_notify_queue );
  return (cnbp != NULL);
}

/****************************************************************************
 Reply to a notify change - queue the request and 
 don't allow a directory to be opened.
****************************************************************************/

static int call_nt_transact_notify_change(connection_struct *conn,
                                          char *inbuf, char *outbuf, int length,
                                          int bufsize, 
                                          char **ppsetup, 
                                          char **ppparams, char **ppdata)
{
  char *setup = *ppsetup;
  files_struct *fsp;
  change_notify_buf *cnbp;

  fsp = file_fsp(setup,4);

  DEBUG(3,("call_nt_transact_notify_change\n"));

  if(!fsp)
    return(ERROR(ERRDOS,ERRbadfid));

  if((!fsp->is_directory) || (conn != fsp->conn))
    return(ERROR(ERRDOS,ERRbadfid));

  /*
   * Now queue an entry on the notify change stack. We timestamp
   * the entry we are adding so that we know when to scan next.
   * We only need to save smb_size bytes from this incoming packet
   * as we will always by returning a 'read the directory yourself'
   * error.
   */

  if((cnbp = (change_notify_buf *)malloc(sizeof(change_notify_buf))) == NULL) {
    DEBUG(0,("call_nt_transact_notify_change: malloc fail !\n" ));
    return -1;
  }

  memset((char *)cnbp, '\0', sizeof(change_notify_buf));

  memcpy(cnbp->request_buf, inbuf, smb_size);
  cnbp->fsp = fsp;
  cnbp->conn = conn;
  cnbp->next_check_time = time(NULL) + lp_change_notify_timeout();
  cnbp->flags = IVAL(setup, 0);

  if(!create_directory_notify_hash( cnbp, &cnbp->change_data )) {
    free((char *)cnbp);
    return(UNIXERROR(ERRDOS,ERRbadfid));
  }

  /*
   * Adding to the tail enables us to check only
   * the head when scanning for change, as this entry
   * is forced to have the first timeout expiration.
   */

  ubi_slAddTail(&change_notify_queue, cnbp);

  DEBUG(3,("call_nt_transact_notify_change: notify change called on directory \
name = %s\n", fsp->fsp_name ));

  return -1;
}

/****************************************************************************
 Map unix perms to NT.
****************************************************************************/

static SEC_ACCESS map_unix_perms( int *pacl_type, mode_t perm, int r_mask, int w_mask, int x_mask, BOOL is_directory)
{
        SEC_ACCESS sa;
        uint32 nt_mask = 0;

        *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;

        if((perm & (r_mask|w_mask|x_mask)) == (r_mask|w_mask|x_mask)) {
                nt_mask = UNIX_ACCESS_RWX;
        } else if((perm & (r_mask|w_mask|x_mask)) == 0) {
                nt_mask = UNIX_ACCESS_NONE;
        } else {
                nt_mask |= (perm & r_mask) ? UNIX_ACCESS_R : 0;
                if(is_directory)
                        nt_mask |= (perm & w_mask) ? UNIX_ACCESS_W : 0;
                else
                        nt_mask |= (perm & w_mask) ? UNIX_ACCESS_W : 0;
                nt_mask |= (perm & x_mask) ? UNIX_ACCESS_X : 0;
        }
        make_sec_access(&sa,nt_mask);
        return sa;
}

/****************************************************************************
 Function to create owner and group SIDs from a SMB_STRUCT_STAT.
****************************************************************************/

static BOOL create_file_sids(SMB_STRUCT_STAT *psbuf, DOM_SID *powner_sid, DOM_SID *pgroup_sid)
{
        POSIX_ID id;

        ZERO_STRUCTP(powner_sid);
        ZERO_STRUCTP(pgroup_sid);
        DEBUG(0,("TODO: create_file_sids: not ok to assume gid is NT group\n"));

        id.type = SURS_POSIX_UID_AS_USR;
        id.id = (uint32)psbuf->st_uid;

        if (!surs_unixid_to_sam_sid(&id, powner_sid, False))
        {
                DEBUG(3,("create_file_sids: map uid %d failed\n",
                                        (int)psbuf->st_uid));
                return False;
        }

        id.type = SURS_POSIX_GID_AS_GRP;
        id.id = (uint32)psbuf->st_gid;

        if (!surs_unixid_to_sam_sid(&id, pgroup_sid, False))
        {
                DEBUG(3,("create_file_sids: map gid %d to group failed\n",
                                        (int)psbuf->st_gid));

                id.type = SURS_POSIX_GID_AS_ALS;
                id.id = (uint32)psbuf->st_gid;

                if (surs_unixid_to_sam_sid(&id, pgroup_sid, False))
                {
                        return True;
                }
                DEBUG(3,("create_file_sids: map gid %d to alias failed\n",
                                                (int)psbuf->st_gid));
                return False;
        }
        return True;
}

/****************************************************************************
 Reply to query a security descriptor from an fsp. If it succeeds it allocates
 the space for the return elements and returns True.
****************************************************************************/

static size_t get_nt_acl(files_struct *fsp, SEC_DESC **ppdesc)
{
  SMB_STRUCT_STAT sbuf;
  SEC_ACE *ace_list = NULL;
  DOM_SID owner_sid;
  DOM_SID group_sid;
  size_t sec_desc_size;
  SEC_ACL *psa = NULL;
  SEC_ACCESS owner_access;
  int owner_acl_type;
  SEC_ACCESS group_access;
  int grp_acl_type;
  SEC_ACCESS other_access;
  int other_acl_type;
  int num_acls = 0;
 
  (*ppdesc) = NULL;

  if(!lp_nt_acl_support()) {
    sid_copy( &owner_sid, global_sid_everyone);
    sid_copy( &group_sid, global_sid_everyone);
  } else {

    if(fsp->is_directory || fsp->fd == -1) {
      if(dos_stat(fsp->fsp_name, &sbuf) != 0) {
        return 0;
      }
    } else {
      if(fsp->conn->vfs_ops.fstat(fsp->fd,&sbuf) != 0) {
        return 0;
      }
    }

    /*
     * Get the owner, group and world SIDs.
     */

    if (!create_file_sids(&sbuf, &owner_sid, &group_sid))
    {
            DEBUG(3,("create_file_sids: uid or gid not mapped to SIDS\n"));
                return 0;
    }

    /*
     * Create the generic 3 element UNIX acl.
     */

    owner_access = map_unix_perms(&owner_acl_type, sbuf.st_mode,
                                                        S_IRUSR, S_IWUSR, S_IXUSR, fsp->is_directory);
    group_access = map_unix_perms(&grp_acl_type, sbuf.st_mode,
                                                        S_IRGRP, S_IWGRP, S_IXGRP, fsp->is_directory);
    other_access = map_unix_perms(&other_acl_type, sbuf.st_mode,
                                                        S_IROTH, S_IWOTH, S_IXOTH, fsp->is_directory);

    if(owner_access.mask)
    {
            ace_list = g_renew(SEC_ACE, ace_list, num_acls+1);
        if (ace_list == NULL)
        {
                return 0;
        }
      make_sec_ace(&ace_list[num_acls++], &owner_sid, owner_acl_type,
                   owner_access, 0);
    }

    if(group_access.mask)
    {
            ace_list = g_renew(SEC_ACE, ace_list, num_acls+1);
        if (ace_list == NULL)
        {
                return 0;
        }

      make_sec_ace(&ace_list[num_acls++], &group_sid, grp_acl_type,
                   group_access, 0);
    }

    if(other_access.mask)
    {
            ace_list = g_renew(SEC_ACE, ace_list, num_acls+1);
        if (ace_list == NULL)
        {
                return 0;
        }

      make_sec_ace(&ace_list[num_acls++], global_sid_everyone, other_acl_type,
                   other_access, 0);
    }

    if(fsp->is_directory) {
      /*
       * For directory ACLs we also add in the inherited permissions
       * ACE entries. These are the permissions a file would get when
       * being created in the directory.
       */
      mode_t mode = unix_mode( fsp->conn, FILE_ATTRIBUTE_ARCHIVE, fsp->fsp_name);

      owner_access = map_unix_perms(&owner_acl_type, mode,
                            S_IRUSR, S_IWUSR, S_IXUSR, fsp->is_directory);
      group_access = map_unix_perms(&grp_acl_type, mode,
                            S_IRGRP, S_IWGRP, S_IXGRP, fsp->is_directory);
      other_access = map_unix_perms(&other_acl_type, mode,
                            S_IROTH, S_IWOTH, S_IXOTH, fsp->is_directory);

      if(owner_access.mask)
    {
            ace_list = g_renew(SEC_ACE, ace_list, num_acls+1);
        if (ace_list == NULL)
        {
                return 0;
        }

        make_sec_ace(&ace_list[num_acls++], &owner_sid, owner_acl_type,
                     owner_access, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_INHERIT_ONLY);
    }

      if(group_access.mask)
    {
            ace_list = g_renew(SEC_ACE, ace_list, num_acls+1);
        if (ace_list == NULL)
        {
                return 0;
        }

        make_sec_ace(&ace_list[num_acls++], &group_sid, grp_acl_type,
                     group_access, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_INHERIT_ONLY);
    }

      if(other_access.mask)
    {
            ace_list = g_renew(SEC_ACE, ace_list, num_acls+1);
        if (ace_list == NULL)
        {
                return 0;
        }

        make_sec_ace(&ace_list[num_acls++], global_sid_everyone, other_acl_type,
                     other_access, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_INHERIT_ONLY);
    }
    }

    if(num_acls)
    {
      psa = g_new(SEC_ACL, 1);
      if (psa == NULL)
      {
              safe_free(ace_list);
      }
      if (!make_sec_acl( psa, 3, num_acls, ace_list))
      {
        DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
        safe_free(ace_list);
        safe_free(psa);
        return 0;
      }
    }
  }

  (*ppdesc) = g_new(SEC_DESC, 1);

  if((*ppdesc) == NULL)
  {
    DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
    sec_desc_size = 0;
    free_sec_acl(psa);
    safe_free(psa);
              return 0;
  }

  sec_desc_size = make_sec_desc( (*ppdesc), 1,
                                 SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
                                 sid_dup(&owner_sid),
                                 sid_dup(&group_sid),
                                 NULL, psa);

  return sec_desc_size;
}

/****************************************************************************
 Reply to query a security descriptor - currently this is not implemented (it
 is planned to be though). Right now it just returns the same thing NT would
 when queried on a FAT filesystem. JRA.
****************************************************************************/

static int call_nt_transact_query_security_desc(connection_struct *conn,
                                                char *inbuf, char *outbuf, 
                                                int length, int bufsize, 
                                                char **ppsetup, char **ppparams, char **ppdata)
{
  uint32 max_data_count = IVAL(inbuf,smb_nt_MaxDataCount);
  char *params = *ppparams;
  char *data = *ppdata;
  prs_struct pd;
  SEC_DESC *psd = NULL;
  size_t sec_desc_size;

  files_struct *fsp = file_fsp(params,0);

  if(!fsp)
    return(ERROR(ERRDOS,ERRbadfid));

  DEBUG(3,("call_nt_transact_query_security_desc: file = %s\n", fsp->fsp_name ));

  params = *ppparams = Realloc(*ppparams, 4);
  if(params == NULL)
    return(ERROR(ERRDOS,ERRnomem));

  /*
   * Get the permissions to return.
   */

  if((sec_desc_size = get_nt_acl(fsp, &psd)) == 0)
    return(UNIXERROR(ERRDOS,ERRnoaccess));

  DEBUG(3,("call_nt_transact_query_security_desc: sec_desc_size = %d.\n",(int)sec_desc_size));

  SIVAL(params,0,(uint32)sec_desc_size);

  if(max_data_count < sec_desc_size) {

    free_sec_desc(psd);
    safe_free(psd);

    send_nt_replies(inbuf, outbuf, bufsize, NT_STATUS_BUFFER_TOO_SMALL,
                    params, 4, *ppdata, 0);
    return -1;
  }

  /*
   * Allocate the data we will point this at.
   */

  data = *ppdata = Realloc(*ppdata, sec_desc_size);
  if(data == NULL) {
    free_sec_desc(psd);
    safe_free(psd);
    return(ERROR(ERRDOS,ERRnomem));
  }

  memset(data, '\0', sec_desc_size);

  /*
   * Init the parse struct we will marshall into.
   */

  prs_init(&pd, sec_desc_size, 4, MARSHALL);

  /*
   * Finally, linearize into the outgoing buffer.
   */

  if(!sec_io_desc( "sd data", psd, &pd, 1))
  {
    free_sec_desc(psd);
    safe_free(psd);
    prs_mem_free(&pd);
    DEBUG(0,("call_nt_transact_query_security_desc: Error in marshalling \
security descriptor.\n"));
    /*
     * Return access denied for want of a better error message..
     */ 
    return(UNIXERROR(ERRDOS,ERRnoaccess));
  }

  /*
   * copy the data out of the marshalled structure
   */

  prs_link(NULL, &pd, NULL);
  prs_buf_copy(data, &pd, 0, sec_desc_size);

  /*
   * Now we can delete the security descriptor.
   */

  prs_mem_free(&pd);
  free_sec_desc(psd);
  safe_free(psd);

  send_nt_replies(inbuf, outbuf, bufsize, 0, params, 4, data, (int)sec_desc_size);
  return -1;
}

/****************************************************************************
 Map NT perms to UNIX.
****************************************************************************/

#define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
#define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
#define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)

static mode_t map_nt_perms( SEC_ACCESS sec_access, int type)
{
  mode_t mode = 0;

  switch(type) {
  case S_IRUSR:
    if(sec_access.mask & GENERIC_ALL_ACCESS)
      mode = S_IRUSR|S_IWUSR|S_IXUSR;
    else {
      mode |= (sec_access.mask & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
      mode |= (sec_access.mask & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
      mode |= (sec_access.mask & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
    }
    break;
  case S_IRGRP:
    if(sec_access.mask & GENERIC_ALL_ACCESS)
      mode = S_IRGRP|S_IWGRP|S_IXGRP;
    else {
      mode |= (sec_access.mask & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
      mode |= (sec_access.mask & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
      mode |= (sec_access.mask & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
    }
    break;
  case S_IROTH:
    if(sec_access.mask & GENERIC_ALL_ACCESS)
      mode = S_IROTH|S_IWOTH|S_IXOTH;
    else {
      mode |= (sec_access.mask & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
      mode |= (sec_access.mask & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
      mode |= (sec_access.mask & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
    }
    break;
  }

  return mode;
}

/****************************************************************************
 Unpack a SEC_DESC into a owner, group and set of UNIX permissions.
****************************************************************************/

static BOOL unpack_nt_permissions(SMB_STRUCT_STAT *psbuf, uid_t *puser, gid_t *pgrp, mode_t *pmode,
                                  uint32 security_info_sent, SEC_DESC *psd, BOOL is_directory)
{
  DOM_SID file_owner_sid;
  DOM_SID file_grp_sid;
  SEC_ACL *dacl = psd->dacl;
  BOOL all_aces_are_inherit_only = (is_directory ? True : False);
  int i;
  POSIX_ID id;

  *pmode = 0;
  *puser = (uid_t)-1;
  *pgrp = (gid_t)-1;

  if(security_info_sent == 0) {
    DEBUG(0,("unpack_nt_permissions: no security info sent !\n"));
    return False;
  }

  /*
   * Windows 2000 sends the owner and group SIDs as the logged in
   * user, not the connected user. But it still sends the file
   * owner SIDs on an ACL set. So we need to check for the file
   * owner and group SIDs as well as the owner SIDs. JRA.
   */
 
    if (!create_file_sids(psbuf, &file_owner_sid, &file_grp_sid))
    {
            DEBUG(3,("create_file_sids: uid or gid not mapped to SIDS\n"));
                return 0;
    }

  /*
   * Don't immediately fail if the owner sid cannot be validated.
   * This may be a group chown only set.
   */

  DEBUG(0,("TODO: LsaLookupSids to find type of owner_sid\n"));

  if (security_info_sent & OWNER_SECURITY_INFORMATION &&
     surs_sam_sid_to_unixid( psd->owner_sid, &id, False) &&
     id.type == SURS_POSIX_UID_AS_USR)
  {
    *puser = (uid_t)id.id;
  }

  /*
   * Don't immediately fail if the group sid cannot be validated.
   * This may be an owner chown only set.
   */

  /*
   * assume support for RID_TYPE_ALIAS and RID_TYPE_GROUP only.
   * also assume that calls to sur_sam_sid_to_unixid are exclusive
   * and one will fail where the other succeeds
   */
   
  if (security_info_sent & GROUP_SECURITY_INFORMATION &&
      surs_sam_sid_to_unixid( psd->grp_sid, &id, False) &&
      (id.type == SURS_POSIX_GID_AS_GRP || id.type == SURS_POSIX_GID_AS_ALS))
  {
    *pgrp = (gid_t)id.id;
  }

  /*
   * If no DACL then this is a chown only security descriptor.
   */

  if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !dacl) {
    *pmode = 0;
    return True;
  }

  /*
   * Now go through the DACL and ensure that
   * any owner/group sids match.
   */

  for(i = 0; i < dacl->num_aces; i++) {
    DOM_SID ace_sid;
    SEC_ACE *psa = &dacl->ace[i];

    if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) &&
       (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
      DEBUG(3,("unpack_nt_permissions: unable to set anything but an ALLOW or DENY ACE.\n"));
      return False;
    }

    /*
     * Ignore or remove bits we don't care about on a directory ACE.
     */

    if(is_directory) {
      if(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
        DEBUG(3,("unpack_nt_permissions: ignoring inherit only ACE.\n"));
        continue;
      }

      /*
       * At least one of the ACE entries wasn't inherit only.
       * Flag this so we know the returned mode is valid.
       */

      all_aces_are_inherit_only = False;
    }

    /*
     * Windows 2000 sets these flags even on *file* ACE's. This is wrong
     * but we can ignore them for now. Revisit this when we go to POSIX
     * ACLs on directories.
     */

    psa->flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT);

    if(psa->flags != 0) {
      DEBUG(1,("unpack_nt_permissions: unable to set ACE flags (%x).\n", 
            (unsigned int)psa->flags));
      return False;
    }

    /*
     * The security mask may be UNIX_ACCESS_NONE which should map into
     * no permissions (we overload the WRITE_OWNER bit for this) or it
     * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
     * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
     */

    psa->info.mask &= (GENERIC_ALL_ACCESS|GENERIC_EXECUTE_ACCESS|GENERIC_WRITE_ACCESS|
                     GENERIC_READ_ACCESS|UNIX_ACCESS_NONE|FILE_ALL_ATTRIBUTES);

    if(psa->info.mask != UNIX_ACCESS_NONE)
      psa->info.mask &= ~UNIX_ACCESS_NONE;

    sid_copy(&ace_sid, &psa->sid);

    if(sid_equal(&ace_sid, &file_owner_sid)) {
      /*
       * Map the desired permissions into owner perms.
       */

      if(psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED)
        *pmode |= map_nt_perms( psa->info, S_IRUSR);
      else
        *pmode &= ~(map_nt_perms( psa->info, S_IRUSR));

    } else if( sid_equal(&ace_sid, &file_grp_sid)) {
      /*
       * Map the desired permissions into group perms.
       */

      if(psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED)
        *pmode |= map_nt_perms( psa->info, S_IRGRP);
      else
        *pmode &= ~(map_nt_perms( psa->info, S_IRGRP));

    } else if( sid_equal(&ace_sid, global_sid_everyone)) {
      /*
       * Map the desired permissions into other perms.
       */

      if(psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED)
        *pmode |= map_nt_perms( psa->info, S_IROTH);
      else
        *pmode &= ~(map_nt_perms( psa->info, S_IROTH));

    } else {
      DEBUG(0,("unpack_nt_permissions: unknown SID used in ACL.\n"));
      return False;
    }
  }

  if (is_directory && all_aces_are_inherit_only) {
    /*
     * Windows 2000 is doing one of these weird 'inherit acl'
     * traverses to conserve NTFS ACL resources. Just pretend
     * there was no DACL sent. JRA.
     */

    DEBUG(10,("unpack_nt_permissions: Win2k inherit acl traverse. Ignoring DACL.\n"));
    free_sec_acl(psd->dacl);
    safe_free(psd->dacl);
    psd->dacl = NULL;
  }

  return True;
}

/****************************************************************************
 Reply to set a security descriptor. Map to UNIX perms.
****************************************************************************/

static int call_nt_transact_set_security_desc(connection_struct *conn,
                                                                        char *inbuf, char *outbuf, int length,
                                                                        int bufsize, char **ppsetup, 
                                                                        char **ppparams, char **ppdata)
{
  uint32 total_parameter_count = IVAL(inbuf, smb_nts_TotalParameterCount);
  char *params= *ppparams;
  char *data = *ppdata;
  prs_struct pd;
  SEC_DESC psd;
  uint32 total_data_count = (uint32)IVAL(inbuf, smb_nts_TotalDataCount);
  uid_t user = (uid_t)-1;
  gid_t grp = (gid_t)-1;
  mode_t perms = 0;
  SMB_STRUCT_STAT sbuf;
  files_struct *fsp = NULL;
  uint32 security_info_sent = 0;
  BOOL got_dacl = False;

  if(!lp_nt_acl_support())
    return(UNIXERROR(ERRDOS,ERRnoaccess));

  if(total_parameter_count < 8)
    return(ERROR(ERRDOS,ERRbadfunc));

  if((fsp = file_fsp(params,0)) == NULL)
    return(ERROR(ERRDOS,ERRbadfid));

  security_info_sent = IVAL(params,4);

  DEBUG(3,("call_nt_transact_set_security_desc: file = %s, sent 0x%x\n", fsp->fsp_name,
       (unsigned int)security_info_sent ));

  /*
   * Init the parse struct we will unmarshall from.
   */

  prs_init(&pd, 0, 4, UNMARSHALL);

  /*
   * Setup the prs_struct with a copy of the memory we just
   * allocated.  unmarshall from the beginning.
   */
        
  prs_append_data(&pd, data, total_data_count);

  /*
   * Finally, unmarshall from the data buffer.
   */

  if(!sec_io_desc( "sd data", &psd, &pd, 1))
  {
    free_sec_desc(&psd);
    prs_mem_free(&pd);
    DEBUG(0,("call_nt_transact_set_security_desc: Error in unmarshalling \
security descriptor.\n"));
    /*
     * Return access denied for want of a better error message..
     */ 
    return(UNIXERROR(ERRDOS,ERRnoaccess));
  }

  /*
   * finished with the marshalling structure, already
   */

  prs_mem_free(&pd);

  /*
   * Get the current state of the file.
   */

  if(fsp->is_directory) {
    if(dos_stat(fsp->fsp_name, &sbuf) != 0) {
      free_sec_desc(&psd);
      return(UNIXERROR(ERRDOS,ERRnoaccess));
    }
  } else {

    int ret;

    if(fsp->fd == -1)
      ret = conn->vfs_ops.stat(dos_to_unix(fsp->fsp_name,False), &sbuf);
    else
      ret = conn->vfs_ops.fstat(fsp->fd,&sbuf);

    if(ret != 0) {
      free_sec_desc(&psd);
      return(UNIXERROR(ERRDOS,ERRnoaccess));
    }
  }

  /*
   * Unpack the user/group/world id's and permissions.
   */

  if(!unpack_nt_permissions( &sbuf, &user, &grp, &perms, security_info_sent, &psd, fsp->is_directory)) {
    free_sec_desc(&psd);
    return(UNIXERROR(ERRDOS,ERRnoaccess));
  }

  if (psd.dacl != NULL)
    got_dacl = True;

  free_sec_desc(&psd);

  /*
   * Do we need to chown ?
   */

  if((user != (uid_t)-1 || grp != (uid_t)-1) && (sbuf.st_uid != user || sbuf.st_gid != grp)) {

    DEBUG(3,("call_nt_transact_set_security_desc: chown %s. uid = %u, gid = %u.\n",
          fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));

    if(dos_chown( fsp->fsp_name, user, grp) == -1) {
      DEBUG(3,("call_nt_transact_set_security_desc: chown %s, %u, %u failed. Error = %s.\n",
            fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
      return(UNIXERROR(ERRDOS,ERRnoaccess));
    }

    /*
     * Recheck the current state of the file, which may have changed.
     * (suid/sgid bits, for instance)
     */

    if(fsp->is_directory) {
      if(dos_stat(fsp->fsp_name, &sbuf) != 0) {
        return(UNIXERROR(ERRDOS,ERRnoaccess));
      }
    } else {

      int ret;
    
      if(fsp->fd == -1)
        ret = conn->vfs_ops.stat(dos_to_unix(fsp->fsp_name,False), &sbuf);
      else
        ret = conn->vfs_ops.fstat(fsp->fd,&sbuf);
  
      if(ret != 0)
        return(UNIXERROR(ERRDOS,ERRnoaccess));
    }
  }

  /*
   * Only change security if we got a DACL.
   */

  if((security_info_sent & DACL_SECURITY_INFORMATION) && got_dacl) {

    /*
     * Check to see if we need to change anything.
     * Enforce limits on modified bits *only*. Don't enforce masks
         * on bits not changed by the user.
     */

    if(fsp->is_directory) {

      perms &= (lp_dir_security_mask(SNUM(conn)) | sbuf.st_mode);
      perms |= (lp_force_dir_security_mode(SNUM(conn)) & ( perms ^ sbuf.st_mode ));

    } else {

      perms &= (lp_security_mask(SNUM(conn)) | sbuf.st_mode); 
      perms |= (lp_force_security_mode(SNUM(conn)) & ( perms ^ sbuf.st_mode ));

    }

    /*
     * Preserve special bits.
     */

    perms |= (sbuf.st_mode & ~0777);

    /*
     * Do we need to chmod ?
     */

    if(sbuf.st_mode != perms) {

      DEBUG(3,("call_nt_transact_set_security_desc: chmod %s. perms = 0%o.\n",
            fsp->fsp_name, (unsigned int)perms ));

      if(conn->vfs_ops.chmod(dos_to_unix(fsp->fsp_name, False), perms) == -1) {
        DEBUG(3,("call_nt_transact_set_security_desc: chmod %s, 0%o failed. Error = %s.\n",
              fsp->fsp_name, (unsigned int)perms, strerror(errno) ));
        return(UNIXERROR(ERRDOS,ERRnoaccess));
      }
    }
  }

  send_nt_replies(inbuf, outbuf, bufsize, 0, NULL, 0, NULL, 0);
  return -1;
}
   
/****************************************************************************
 Reply to IOCTL - not implemented - no plans.
****************************************************************************/
static int call_nt_transact_ioctl(connection_struct *conn,
                                  char *inbuf, char *outbuf, int length,
                                  int bufsize, 
                                  char **ppsetup, char **ppparams, char **ppdata)
{
  static BOOL logged_message = False;

  if(!logged_message) {
    DEBUG(0,("call_nt_transact_ioctl: Currently not implemented.\n"));
    logged_message = True; /* Only print this once... */
  }
  return(ERROR(ERRSRV,ERRnosupport));
}
   
/****************************************************************************
 Reply to a SMBNTtrans.
****************************************************************************/
int reply_nttrans(connection_struct *conn,
                  char *inbuf,char *outbuf,int length,int bufsize)
{
  int  outsize = 0;
#if 0 /* Not used. */
  uint16 max_setup_count = CVAL(inbuf, smb_nt_MaxSetupCount);
  uint32 max_parameter_count = IVAL(inbuf, smb_nt_MaxParameterCount);
  uint32 max_data_count = IVAL(inbuf,smb_nt_MaxDataCount);
#endif /* Not used. */
  uint32 total_parameter_count = IVAL(inbuf, smb_nt_TotalParameterCount);
  uint32 total_data_count = IVAL(inbuf, smb_nt_TotalDataCount);
  uint32 parameter_count = IVAL(inbuf,smb_nt_ParameterCount);
  uint32 parameter_offset = IVAL(inbuf,smb_nt_ParameterOffset);
  uint32 data_count = IVAL(inbuf,smb_nt_DataCount);
  uint32 data_offset = IVAL(inbuf,smb_nt_DataOffset);
  uint16 setup_count = 2*CVAL(inbuf,smb_nt_SetupCount); /* setup count is in *words* */
  uint16 function_code = SVAL( inbuf, smb_nt_Function);
  char *params = NULL, *data = NULL, *setup = NULL;
  uint32 num_params_sofar, num_data_sofar;

  if(global_oplock_break && (function_code == NT_TRANSACT_CREATE)) {
    /*
     * Queue this open message as we are the process of an oplock break.
     */

    DEBUG(2,("reply_nttrans: queueing message NT_TRANSACT_CREATE \
due to being in oplock break state.\n" ));

    push_oplock_pending_smb_message( inbuf, length);
    return -1;
  }

  outsize = set_message(outbuf,0,0,True);

  /* 
   * All nttrans messages we handle have smb_wct == 19 + setup_count.
   * Ensure this is so as a sanity check.
   */

  if(CVAL(inbuf, smb_wct) != 19 + (setup_count/2)) {
    DEBUG(2,("Invalid smb_wct %d in nttrans call (should be %d)\n",
          CVAL(inbuf, smb_wct), 19 + (setup_count/2)));
    return(ERROR(ERRSRV,ERRerror));
  }
    
  /* Allocate the space for the setup, the maximum needed parameters and data */

  if(setup_count > 0)
    setup = (char *)malloc(setup_count);
  if (total_parameter_count > 0)
    params = (char *)malloc(total_parameter_count);
  if (total_data_count > 0)
    data = (char *)malloc(total_data_count);
 
  if ((total_parameter_count && !params)  || (total_data_count && !data) ||
      (setup_count && !setup)) {
    DEBUG(0,("reply_nttrans : Out of memory\n"));
    return(ERROR(ERRDOS,ERRnomem));
  }

  /* Copy the param and data bytes sent with this request into
     the params buffer */
  num_params_sofar = parameter_count;
  num_data_sofar = data_count;

  if (parameter_count > total_parameter_count || data_count > total_data_count)
    exit_server("reply_nttrans: invalid sizes in packet.\n");

  if(setup) {
    memcpy( setup, &inbuf[smb_nt_SetupStart], setup_count);
    DEBUG(10,("reply_nttrans: setup_count = %d\n", setup_count));
    dump_data(10, setup, setup_count);
  }
  if(params) {
    memcpy( params, smb_base(inbuf) + parameter_offset, parameter_count);
    DEBUG(10,("reply_nttrans: parameter_count = %d\n", parameter_count));
    dump_data(10, params, parameter_count);
  }
  if(data) {
    memcpy( data, smb_base(inbuf) + data_offset, data_count);
    DEBUG(10,("reply_nttrans: data_count = %d\n",data_count));
    dump_data(10, data, data_count);
  }

  if(num_data_sofar < total_data_count || num_params_sofar < total_parameter_count) {
    /* We need to send an interim response then receive the rest
       of the parameter/data bytes */
    outsize = set_message(outbuf,0,0,True);
    send_smb(smbd_server_fd(),outbuf);

    while( num_data_sofar < total_data_count || num_params_sofar < total_parameter_count) {
      BOOL ret;

      ret = receive_next_smb(inbuf,bufsize,SMB_SECONDARY_WAIT);

      if((ret && (CVAL(inbuf, smb_com) != SMBnttranss)) || !ret) {
        outsize = set_message(outbuf,0,0,True);
        if(ret) {
                DEBUG(0,("reply_nttrans: Invalid secondary nttrans packet\n"));
        } else {
                DEBUG(0,("reply_nttrans: %s in getting secondary nttrans response.\n",
                         (smb_read_error == READ_ERROR) ? "error" : "timeout" ));
        }
        if(params)
          free(params);
        if(data)
          free(data);
        if(setup)
          free(setup);
        return(ERROR(ERRSRV,ERRerror));
      }
      
      /* Revise total_params and total_data in case they have changed downwards */
      total_parameter_count = IVAL(inbuf, smb_nts_TotalParameterCount);
      total_data_count = IVAL(inbuf, smb_nts_TotalDataCount);
      num_params_sofar += (parameter_count = IVAL(inbuf,smb_nts_ParameterCount));
      num_data_sofar += ( data_count = IVAL(inbuf, smb_nts_DataCount));
      if (num_params_sofar > total_parameter_count || num_data_sofar > total_data_count)
        exit_server("reply_nttrans2: data overflow in secondary nttrans packet\n");

      memcpy( &params[ IVAL(inbuf, smb_nts_ParameterDisplacement)], 
              smb_base(inbuf) + IVAL(inbuf, smb_nts_ParameterOffset), parameter_count);
      memcpy( &data[IVAL(inbuf, smb_nts_DataDisplacement)],
              smb_base(inbuf)+ IVAL(inbuf, smb_nts_DataOffset), data_count);
    }
  }

  if (Protocol >= PROTOCOL_NT1) {
    uint16 flg2 = SVAL(outbuf,smb_flg2);
    SSVAL(outbuf,smb_flg2,flg2 | 0x40); /* IS_LONG_NAME */
  }

  /* Now we must call the relevant NT_TRANS function */
  switch(function_code) {
    case NT_TRANSACT_CREATE:
      outsize = call_nt_transact_create(conn, inbuf, outbuf, length, bufsize, 
                                        &setup, &params, &data);
      break;
    case NT_TRANSACT_IOCTL:
      outsize = call_nt_transact_ioctl(conn, 
                                       inbuf, outbuf, length, bufsize, 
                                       &setup, &params, &data);
      break;
    case NT_TRANSACT_SET_SECURITY_DESC:
      outsize = call_nt_transact_set_security_desc(conn, inbuf, outbuf, 
                                                   length, bufsize, 
                                                   &setup, &params, &data);
      break;
    case NT_TRANSACT_NOTIFY_CHANGE:
      outsize = call_nt_transact_notify_change(conn, inbuf, outbuf, 
                                               length, bufsize, 
                                               &setup, &params, &data);
      break;
    case NT_TRANSACT_RENAME:
      outsize = call_nt_transact_rename(conn, inbuf, outbuf, length, 
                                        bufsize, 
                                        &setup, &params, &data);
      break;

    case NT_TRANSACT_QUERY_SECURITY_DESC:
      outsize = call_nt_transact_query_security_desc(conn, inbuf, outbuf, 
                                                     length, bufsize, 
                                                     &setup, &params, &data);
      break;
  default:
          /* Error in request */
          DEBUG(0,("reply_nttrans: Unknown request %d in nttrans call\n", function_code));
          if(setup)
                  free(setup);
          if(params)
                  free(params);
          if(data)
                  free(data);
          return (ERROR(ERRSRV,ERRerror));
  }

  /* As we do not know how many data packets will need to be
     returned here the various call_nt_transact_xxxx calls
     must send their own. Thus a call_nt_transact_xxxx routine only
     returns a value other than -1 when it wants to send
     an error packet. 
  */

  if(setup)
    free(setup);
  if(params)
    free(params);
  if(data)
    free(data);
  return outsize; /* If a correct response was needed the call_nt_transact_xxxx 
                     calls have already sent it. If outsize != -1 then it is
                     returning an error packet. */
}