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ldif.c

/* ldif.c - the ldif backend */
/* $OpenLDAP: pkg/ldap/servers/slapd/back-ldif/ldif.c,v 1.48.2.14 2008/04/21 18:53:52 quanah Exp $ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 2005-2008 The OpenLDAP Foundation.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted only as authorized by the OpenLDAP
 * Public License.
 *
 * A copy of this license is available in the file LICENSE in the
 * top-level directory of the distribution or, alternatively, at
 * <http://www.OpenLDAP.org/license.html>.
 */
/* ACKNOWLEDGEMENTS:
 * This work was originally developed by Eric Stokes for inclusion
 * in OpenLDAP Software.
 */

#include "portable.h"
#include <stdio.h>
#include <ac/string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <ac/dirent.h>
#include <fcntl.h>
#include <ac/errno.h>
#include <ac/unistd.h>
#include "slap.h"
#include "lutil.h"
#include "config.h"

typedef struct enumCookie {
      Operation *op;
      SlapReply *rs;
      Entry **entries;
      int elen;
      int eind;
} enumCookie;

struct ldif_info {
      struct berval li_base_path;
      enumCookie li_tool_cookie;
      ID li_tool_current;
      ldap_pvt_thread_rdwr_t  li_rdwr;
};

#ifdef _WIN32
#define mkdir(a,b)      mkdir(a)
#endif


#define LDIF      ".ldif"
#define LDIF_FILETYPE_SEP     '.'               /* LDIF[0] */

/*
 * Unsafe/translated characters in the filesystem.
 *
 * LDIF_UNSAFE_CHAR(c) returns true if the character c is not to be used
 * in relative filenames, except it should accept '\\' even if unsafe and
 * need not reject '{' and '}'.  The value should be a constant expression.
 *
 * If '\\' is unsafe, #define LDIF_ESCAPE_CHAR as a safe character.
 *
 * If '{' and '}' are unsafe, #define IX_FSL/IX_FSR as safe characters.
 * (Not digits, '-' or '+'.  IX_FSL == IX_FSR is allowed.)
 *
 * Characters are escaped as LDIF_ESCAPE_CHAR followed by two hex digits,
 * except '\\' is replaced with LDIF_ESCAPE_CHAR and {} with IX_FS[LR].
 * Also some LDIF special chars are hex-escaped.
 *
 * Thus an LDIF filename is a valid normalized RDN (or suffix DN)
 * followed by ".ldif", except with '\\' replaced with LDIF_ESCAPE_CHAR.
 */

#ifndef _WIN32

/*
 * Unix/MacOSX version.  ':' vs '/' can cause confusion on MacOSX so we
 * escape both.  We escape them on Unix so both OS variants get the same
 * filenames.
 */
#define LDIF_ESCAPE_CHAR      '\\'
#define LDIF_UNSAFE_CHAR(c)   ((c) == '/' || (c) == ':')

#else /* _WIN32 */

/* Windows version - Microsoft's list of unsafe characters, except '\\' */
#define LDIF_ESCAPE_CHAR      '^'
#define LDIF_UNSAFE_CHAR(c)   \
      ((c) == '/' || (c) == ':' || \
       (c) == '<' || (c) == '>' || (c) == '"' || \
       (c) == '|' || (c) == '?' || (c) == '*')

#endif /* !_WIN32 */

/*
 * Left and Right "{num}" prefix to ordered RDNs ("olcDatabase={1}bdb").
 * IX_DN* are for LDAP RDNs, IX_FS* for their .ldif filenames.
 */
#define IX_DNL    '{'
#define     IX_DNR      '}'
#ifndef IX_FSL
#define     IX_FSL      IX_DNL
#define IX_FSR    IX_DNR
#endif

/*
 * Test for unsafe chars, as well as chars handled specially by back-ldif:
 * - If the escape char is not '\\', it must itself be escaped.  Otherwise
 *   '\\' and the escape char would map to the same character.
 * - Escape the '.' in ".ldif", so the directory for an RDN that actually
 *   ends with ".ldif" can not conflict with a file of the same name.  And
 *   since some OSes/programs choke on multiple '.'s, escape all of them.
 * - If '{' and '}' are translated to some other characters, those
 *   characters must in turn be escaped when they occur in an RDN.
 */
#ifndef LDIF_NEED_ESCAPE
#define     LDIF_NEED_ESCAPE(c) \
      ((LDIF_UNSAFE_CHAR(c)) || \
       LDIF_MAYBE_UNSAFE(c, LDIF_ESCAPE_CHAR) || \
       LDIF_MAYBE_UNSAFE(c, LDIF_FILETYPE_SEP) || \
       LDIF_MAYBE_UNSAFE(c, IX_FSL) || \
       (IX_FSR != IX_FSL && LDIF_MAYBE_UNSAFE(c, IX_FSR)))
#endif
/*
 * Helper macro for LDIF_NEED_ESCAPE(): Treat character x as unsafe if
 * back-ldif does not already treat is specially.
 */
#define LDIF_MAYBE_UNSAFE(c, x) \
      (!(LDIF_UNSAFE_CHAR(x) || (x) == '\\' || (x) == IX_DNL || (x) == IX_DNR) \
       && (c) == (x))


#define ENTRY_BUFF_INCREMENT 500

static ConfigTable ldifcfg[] = {
      { "directory", "dir", 2, 2, 0, ARG_BERVAL|ARG_OFFSET,
            (void *)offsetof(struct ldif_info, li_base_path),
            "( OLcfgDbAt:0.1 NAME 'olcDbDirectory' "
                  "DESC 'Directory for database content' "
                  "EQUALITY caseIgnoreMatch "
                  "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
      { NULL, NULL, 0, 0, 0, ARG_IGNORED,
            NULL, NULL, NULL, NULL }
};

static ConfigOCs ldifocs[] = {
      { "( OLcfgDbOc:2.1 "
            "NAME 'olcLdifConfig' "
            "DESC 'LDIF backend configuration' "
            "SUP olcDatabaseConfig "
            "MUST ( olcDbDirectory ) )", Cft_Database, ldifcfg },
      { NULL, 0, NULL }
};


/* Set *res = LDIF filename path for the normalized DN */
static void
dn2path( BackendDB *be, struct berval *dn, struct berval *res )
{
      struct ldif_info *li = (struct ldif_info *) be->be_private;
      struct berval *suffixdn = &be->be_nsuffix[0];
      const char *start, *end, *next, *p;
      char ch, *ptr;
      ber_len_t len;
      static const char hex[] = "0123456789ABCDEF";

      assert( dn != NULL );
      assert( !BER_BVISNULL( dn ) );
      assert( suffixdn != NULL );
      assert( !BER_BVISNULL( suffixdn ) );
      assert( dnIsSuffix( dn, suffixdn ) );

      start = dn->bv_val;
      end = start + dn->bv_len;

      /* Room for dir, dirsep, dn, LDIF, "\hexpair"-escaping of unsafe chars */
      len = li->li_base_path.bv_len + dn->bv_len + (1 + STRLENOF( LDIF ));
      for ( p = start; p < end; ) {
            ch = *p++;
            if ( LDIF_NEED_ESCAPE( ch ) )
                  len += 2;
      }
      res->bv_val = ch_malloc( len + 1 );

      ptr = lutil_strcopy( res->bv_val, li->li_base_path.bv_val );
      for ( next = end - suffixdn->bv_len; end > start; end = next ) {
            /* Set p = start of DN component, next = &',' or start of DN */
            while ( (p = next) > start ) {
                  --next;
                  if ( DN_SEPARATOR( *next ) )
                        break;
            }
            /* Append <dirsep> <p..end-1: RDN or database-suffix> */
            for ( *ptr++ = LDAP_DIRSEP[0]; p < end; *ptr++ = ch ) {
                  ch = *p++;
                  if ( LDIF_ESCAPE_CHAR != '\\' && ch == '\\' ) {
                        ch = LDIF_ESCAPE_CHAR;
                  } else if ( IX_FSL != IX_DNL && ch == IX_DNL ) {
                        ch = IX_FSL;
                  } else if ( IX_FSR != IX_DNR && ch == IX_DNR ) {
                        ch = IX_FSR;
                  } else if ( LDIF_NEED_ESCAPE( ch ) ) {
                        *ptr++ = LDIF_ESCAPE_CHAR;
                        *ptr++ = hex[(ch & 0xFFU) >> 4];
                        ch = hex[ch & 0x0FU];
                  }
            }
      }
      ptr = lutil_strcopy( ptr, LDIF );
      res->bv_len = ptr - res->bv_val;

      assert( res->bv_len <= len );
}

static char * slurp_file(int fd) {
      int read_chars_total = 0;
      int read_chars = 0;
      int entry_size;
      char * entry;
      char * entry_pos;
      struct stat st;

      fstat(fd, &st);
      entry_size = st.st_size;
      entry = ch_malloc( entry_size+1 );
      entry_pos = entry;
      
      while(1) {
            read_chars = read(fd, (void *) entry_pos, entry_size - read_chars_total);
            if(read_chars == -1) {
                  SLAP_FREE(entry);
                  return NULL;
            }
            if(read_chars == 0) {
                  entry[read_chars_total] = '\0';
                  break;
            }
            else {
                  read_chars_total += read_chars;
                  entry_pos += read_chars;
            }
      }
      return entry;
}

/*
 * return nonnegative for success or -1 for error
 * do not return numbers less than -1
 */
static int spew_file(int fd, char * spew, int len) {
      int writeres = 0;
      
      while(len > 0) {
            writeres = write(fd, spew, len);
            if(writeres == -1) {
                  return -1;
            }
            else {
                  spew += writeres;
                  len -= writeres;
            }
      }
      return writeres;
}

static int
spew_entry( Entry * e, struct berval * path, int dolock, int *save_errnop )
{
      int rs, save_errno = 0;
      int openres;
      int res, spew_res;
      int entry_length;
      char * entry_as_string;
      char *tmpfname = NULL;

      tmpfname = ch_malloc( path->bv_len + STRLENOF( "XXXXXX" ) + 1 );
      AC_MEMCPY( tmpfname, path->bv_val, path->bv_len );
      AC_MEMCPY( &tmpfname[ path->bv_len ], "XXXXXX", STRLENOF( "XXXXXX" ) + 1 );

      openres = mkstemp( tmpfname );
      if ( openres == -1 ) {
            save_errno = errno;
            rs = LDAP_UNWILLING_TO_PERFORM;
            Debug( LDAP_DEBUG_ANY, "could not create tmpfile \"%s\": %s\n",
                  tmpfname, STRERROR( save_errno ), 0 );

      } else {
            struct berval rdn;
            int tmp;

            /* Only save the RDN onto disk */
            dnRdn( &e->e_name, &rdn );
            if ( rdn.bv_len != e->e_name.bv_len ) {
                  e->e_name.bv_val[rdn.bv_len] = '\0';
                  tmp = e->e_name.bv_len;
                  e->e_name.bv_len = rdn.bv_len;
                  rdn.bv_len = tmp;
            }

            spew_res = -2;
            if ( dolock ) {
                  ldap_pvt_thread_mutex_lock(&entry2str_mutex);
            }

            entry_as_string = entry2str(e, &entry_length);
            if ( entry_as_string != NULL ) {
                  spew_res = spew_file( openres,
                        entry_as_string, entry_length );
                  if ( spew_res == -1 ) {
                        save_errno = errno;
                  }
            }

            if ( dolock ) {
                  ldap_pvt_thread_mutex_unlock(&entry2str_mutex);
            }

            /* Restore full DN */
            if ( rdn.bv_len != e->e_name.bv_len ) {
                  e->e_name.bv_val[e->e_name.bv_len] = ',';
                  e->e_name.bv_len = rdn.bv_len;
            }

            res = close( openres );
            rs = LDAP_UNWILLING_TO_PERFORM;

            if ( spew_res > -2 ) {
                  if ( res == -1 || spew_res == -1 ) {
                        if ( save_errno == 0 ) {
                              save_errno = errno;
                        }
                        Debug( LDAP_DEBUG_ANY, "write error to tmpfile \"%s\": %s\n",
                              tmpfname, STRERROR( save_errno ), 0 );

                  } else {
                        res = rename( tmpfname, path->bv_val );
                        if ( res == 0 ) {
                              rs = LDAP_SUCCESS;

                        } else {
                              save_errno = errno;
                              switch ( save_errno ) {
                              case ENOENT:
                                    rs = LDAP_NO_SUCH_OBJECT;
                                    break;

                              default:
                                    break;
                              }
                        }
                  }
            }

            if ( rs != LDAP_SUCCESS ) {
                  unlink( tmpfname );
            }
      }

      ch_free( tmpfname );

      if ( rs != LDAP_SUCCESS && save_errnop != NULL ) {
            *save_errnop = save_errno;
      }

      return rs;
}

static Entry * get_entry_for_fd(int fd,
      struct berval *pdn,
      struct berval *pndn)
{
      char * entry = (char *) slurp_file(fd);
      Entry * ldentry = NULL;
      
      /* error reading file */
      if(entry == NULL) {
            goto return_value;
      }

      ldentry = str2entry(entry);
      if ( ldentry ) {
            struct berval rdn;
            rdn = ldentry->e_name;
            build_new_dn( &ldentry->e_name, pdn, &rdn, NULL );
            ch_free( rdn.bv_val );
            rdn = ldentry->e_nname;
            build_new_dn( &ldentry->e_nname, pndn, &rdn, NULL );
            ch_free( rdn.bv_val );
      }

 return_value:
      if(fd != -1) {
            if(close(fd) != 0) {
                  /* log error */
            }
      }
      if(entry != NULL)
            SLAP_FREE(entry);
      return ldentry;
}

static int
get_entry(
      Operation *op,
      Entry **entryp,
      struct berval *pathp )
{
      int rc;
      struct berval path, pdn, pndn;
      int fd;

      dnParent(&op->o_req_dn, &pdn);
      dnParent(&op->o_req_ndn, &pndn);
      dn2path( op->o_bd, &op->o_req_ndn, &path );
      fd = open(path.bv_val, O_RDONLY);
      /* error opening file (mebbe should log error) */
      if ( fd == -1 && ( errno != ENOENT || op->o_tag != LDAP_REQ_ADD ) ) {
            Debug( LDAP_DEBUG_ANY, "failed to open file \"%s\": %s\n",
                  path.bv_val, STRERROR(errno), 0 );
      }
      *entryp = fd < 0 ? NULL : get_entry_for_fd( fd, &pdn, &pndn );
      rc = *entryp ? LDAP_SUCCESS : LDAP_NO_SUCH_OBJECT;

      if ( rc == LDAP_SUCCESS && pathp != NULL ) {
            *pathp = path;
      } else {
            SLAP_FREE(path.bv_val);
      }
      return rc;
}

static void fullpath(struct berval *base, struct berval *name, struct berval *res) {
      char *ptr;
      res->bv_len = name->bv_len + base->bv_len + 1;
      res->bv_val = ch_malloc( res->bv_len + 1 );
      strcpy(res->bv_val, base->bv_val);
      ptr = res->bv_val + base->bv_len;
      *ptr++ = LDAP_DIRSEP[0];
      strcpy(ptr, name->bv_val);
}

typedef struct bvlist {
      struct bvlist *next;
      struct berval bv;
      struct berval num;
      int inum;
      int off;
} bvlist;


static int r_enum_tree(enumCookie *ck, struct berval *path, int base,
      struct berval *pdn, struct berval *pndn)
{
      Entry *e = NULL;
      int fd = 0, rc = LDAP_SUCCESS;

      if ( !base ) {
            fd = open( path->bv_val, O_RDONLY );
            if ( fd < 0 ) {
                  Debug( LDAP_DEBUG_TRACE,
                        "=> ldif_enum_tree: failed to open %s: %s\n",
                        path->bv_val, STRERROR(errno), 0 );
                  return LDAP_NO_SUCH_OBJECT;
            }

            e = get_entry_for_fd(fd, pdn, pndn);
            if ( !e ) {
                  Debug( LDAP_DEBUG_ANY,
                        "=> ldif_enum_tree: failed to read entry for %s\n",
                        path->bv_val, 0, 0 );
                  return LDAP_BUSY;
            }

            if ( ck->op->ors_scope == LDAP_SCOPE_BASE ||
                  ck->op->ors_scope == LDAP_SCOPE_SUBTREE ) {
                  /* Send right away? */
                  if ( ck->rs ) {
                        /*
                         * if it's a referral, add it to the list of referrals. only do
                         * this for non-base searches, and don't check the filter
                         * explicitly here since it's only a candidate anyway.
                         */
                        if ( !get_manageDSAit( ck->op )
                                    && ck->op->ors_scope != LDAP_SCOPE_BASE
                                    && is_entry_referral( e ) )
                        {
                              BerVarray erefs = get_entry_referrals( ck->op, e );
                              ck->rs->sr_ref = referral_rewrite( erefs,
                                          &e->e_name, NULL,
                                          ck->op->oq_search.rs_scope == LDAP_SCOPE_ONELEVEL
                                                ? LDAP_SCOPE_BASE : LDAP_SCOPE_SUBTREE );
      
                              ck->rs->sr_entry = e;
                              rc = send_search_reference( ck->op, ck->rs );
                              ber_bvarray_free( ck->rs->sr_ref );
                              ber_bvarray_free( erefs );
                              ck->rs->sr_ref = NULL;
                              ck->rs->sr_entry = NULL;
      
                        } else if ( test_filter( ck->op, e, ck->op->ors_filter ) == LDAP_COMPARE_TRUE )
                        {
                              ck->rs->sr_entry = e;
                              ck->rs->sr_attrs = ck->op->ors_attrs;
                              ck->rs->sr_flags = REP_ENTRY_MODIFIABLE;
                              rc = send_search_entry(ck->op, ck->rs);
                              ck->rs->sr_entry = NULL;
                        }
                        fd = 1;
                        if ( rc )
                              goto done;
                  } else {
                  /* Queueing up for tool mode */
                        if(ck->entries == NULL) {
                              ck->entries = (Entry **) ch_malloc(sizeof(Entry *) * ENTRY_BUFF_INCREMENT);
                              ck->elen = ENTRY_BUFF_INCREMENT;
                        }
                        if(ck->eind >= ck->elen) { /* grow entries if necessary */  
                              ck->entries = (Entry **) ch_realloc(ck->entries, sizeof(Entry *) * (ck->elen) * 2);
                              ck->elen *= 2;
                        }
      
                        ck->entries[ck->eind++] = e;
                        fd = 0;
                  }
            } else {
                  fd = 1;
            }
      }

      if ( ck->op->ors_scope != LDAP_SCOPE_BASE ) {
            DIR * dir_of_path;
            bvlist *list = NULL, *ptr;

            path->bv_len -= STRLENOF( LDIF );
            path->bv_val[path->bv_len] = '\0';

            dir_of_path = opendir(path->bv_val);
            if(dir_of_path == NULL) { /* can't open directory */
                  if ( errno != ENOENT ) {
                        /* it shouldn't be treated as an error
                         * only if the directory doesn't exist */
                        rc = LDAP_BUSY;
                        Debug( LDAP_DEBUG_ANY,
                              "=> ldif_enum_tree: failed to opendir %s (%d)\n",
                              path->bv_val, errno, 0 );
                  }
                  goto done;
            }
      
            while(1) {
                  struct berval fname, itmp;
                  struct dirent * dir;
                  bvlist *bvl, **prev;

                  dir = readdir(dir_of_path);
                  if(dir == NULL) break; /* end of the directory */
                  fname.bv_len = strlen( dir->d_name );
                  if ( fname.bv_len <= STRLENOF( LDIF ))
                        continue;
                  if ( strcmp( dir->d_name + (fname.bv_len - STRLENOF(LDIF)), LDIF))
                        continue;
                  fname.bv_val = dir->d_name;

                  bvl = ch_malloc( sizeof(bvlist) );
                  ber_dupbv( &bvl->bv, &fname );
                  BER_BVZERO( &bvl->num );
                  itmp.bv_val = ber_bvchr( &bvl->bv, IX_FSL );
                  if ( itmp.bv_val ) {
                        char *ptr;
                        itmp.bv_val++;
                        itmp.bv_len = bvl->bv.bv_len
                              - ( itmp.bv_val - bvl->bv.bv_val );
                        ptr = ber_bvchr( &itmp, IX_FSR );
                        if ( ptr ) {
                              itmp.bv_len = ptr - itmp.bv_val;
                              ber_dupbv( &bvl->num, &itmp );
                              bvl->inum = strtol( itmp.bv_val, NULL, 0 );
                              itmp.bv_val[0] = '\0';
                              bvl->off = itmp.bv_val - bvl->bv.bv_val;
                        }
                  }

                  for (prev = &list; (ptr = *prev) != NULL; prev = &ptr->next) {
                        int cmp = strcmp( bvl->bv.bv_val, ptr->bv.bv_val );
                        if ( !cmp && bvl->num.bv_val )
                              cmp = bvl->inum - ptr->inum;
                        if ( cmp < 0 )
                              break;
                  }
                  *prev = bvl;
                  bvl->next = ptr;
                        
            }
            closedir(dir_of_path);

            if (ck->op->ors_scope == LDAP_SCOPE_ONELEVEL)
                  ck->op->ors_scope = LDAP_SCOPE_BASE;
            else if ( ck->op->ors_scope == LDAP_SCOPE_SUBORDINATE)
                  ck->op->ors_scope = LDAP_SCOPE_SUBTREE;

            while ( ( ptr = list ) ) {
                  struct berval fpath;

                  list = ptr->next;

                  if ( rc == LDAP_SUCCESS ) {
                        if ( ptr->num.bv_val )
                              AC_MEMCPY( ptr->bv.bv_val + ptr->off, ptr->num.bv_val,
                                    ptr->num.bv_len );
                        fullpath( path, &ptr->bv, &fpath );
                        rc = r_enum_tree(ck, &fpath, 0,
                              e != NULL ? &e->e_name : pdn,
                              e != NULL ? &e->e_nname : pndn );
                        free(fpath.bv_val);
                  }
                  if ( ptr->num.bv_val )
                        free( ptr->num.bv_val );
                  free(ptr->bv.bv_val);
                  free(ptr);
            }
      }
done:
      if ( fd ) entry_free( e );
      return rc;
}

static int
enum_tree(
      enumCookie *ck
)
{
      struct berval path;
      struct berval pdn, pndn;
      int rc;

      dnParent( &ck->op->o_req_dn, &pdn );
      dnParent( &ck->op->o_req_ndn, &pndn );
      dn2path( ck->op->o_bd, &ck->op->o_req_ndn, &path );
      rc = r_enum_tree(ck, &path, BER_BVISEMPTY( &ck->op->o_req_ndn ) ? 1 : 0, &pdn, &pndn);
      ch_free( path.bv_val );
      return rc;
}


/* Get the parent directory path, plus the LDIF suffix overwritten by a \0 */
static void
get_parent_path( struct berval *dnpath, struct berval *res )
{
      int dnpathlen = dnpath->bv_len;
      int i;
      
      for(i = dnpathlen;i>0;i--) /* find the first path seperator */
            if(dnpath->bv_val[i] == LDAP_DIRSEP[0])
                  break;
      res->bv_len = i;
      res->bv_val = ch_malloc( res->bv_len + 1 + STRLENOF(LDIF) );
      strncpy(res->bv_val, dnpath->bv_val, i);
      strcpy(res->bv_val+i, LDIF);
      res->bv_val[i] = '\0';
}

static int apply_modify_to_entry(Entry * entry,
                        Modifications * modlist,
                        Operation * op,
                        SlapReply * rs)
{
      char textbuf[SLAP_TEXT_BUFLEN];
      int rc = modlist ? LDAP_UNWILLING_TO_PERFORM : LDAP_SUCCESS;
      int is_oc = 0;
      Modification *mods;

      if (!acl_check_modlist(op, entry, modlist)) {
            return LDAP_INSUFFICIENT_ACCESS;
      }

      for (; modlist != NULL; modlist = modlist->sml_next) {
            mods = &modlist->sml_mod;

            if ( mods->sm_desc == slap_schema.si_ad_objectClass ) {
                  is_oc = 1;
            }
            switch (mods->sm_op) {
            case LDAP_MOD_ADD:
                  rc = modify_add_values(entry, mods,
                           get_permissiveModify(op),
                           &rs->sr_text, textbuf,
                           sizeof( textbuf ) );
                  break;
                        
            case LDAP_MOD_DELETE:
                  rc = modify_delete_values(entry, mods,
                        get_permissiveModify(op),
                        &rs->sr_text, textbuf,
                        sizeof( textbuf ) );
                  break;
                        
            case LDAP_MOD_REPLACE:
                  rc = modify_replace_values(entry, mods,
                         get_permissiveModify(op),
                         &rs->sr_text, textbuf,
                         sizeof( textbuf ) );
                  break;

            case LDAP_MOD_INCREMENT:
                  rc = modify_increment_values( entry,
                        mods, get_permissiveModify(op),
                        &rs->sr_text, textbuf,
                        sizeof( textbuf ) );
                  break;

            case SLAP_MOD_SOFTADD:
                  mods->sm_op = LDAP_MOD_ADD;
                  rc = modify_add_values(entry, mods,
                           get_permissiveModify(op),
                           &rs->sr_text, textbuf,
                           sizeof( textbuf ) );
                  mods->sm_op = SLAP_MOD_SOFTADD;
                  if (rc == LDAP_TYPE_OR_VALUE_EXISTS) {
                        rc = LDAP_SUCCESS;
                  }
                  break;
            }
            if(rc != LDAP_SUCCESS) break;
      }

      if(rc == LDAP_SUCCESS) {
            if ( is_oc ) {
                  entry->e_ocflags = 0;
            }
            /* check that the entry still obeys the schema */
            rc = entry_schema_check( op, entry, NULL, 0, 0,
                    &rs->sr_text, textbuf, sizeof( textbuf ) );
      }

      return rc;
}

int
ldif_back_referrals( Operation *op, SlapReply *rs )
{
      struct ldif_info  *li = NULL;
      Entry             *entry;
      int               rc = LDAP_SUCCESS;

#if 0
      if ( op->o_tag == LDAP_REQ_SEARCH ) {
            /* let search take care of itself */
            return rc;
      }
#endif

      if ( get_manageDSAit( op ) ) {
            /* let op take care of DSA management */
            return rc;
      }

      if ( BER_BVISEMPTY( &op->o_req_ndn ) ) {
            /* the empty DN cannot be a referral */
            return rc;
      }

      li = (struct ldif_info *)op->o_bd->be_private;
      ldap_pvt_thread_rdwr_rlock( &li->li_rdwr );
      get_entry( op, &entry, NULL );

      /* no object is found for them */
      if ( entry == NULL ) {
            struct berval     odn = op->o_req_dn;
            struct berval     ondn = op->o_req_ndn;
            struct berval     pndn = ondn;
            ber_len_t         min_dnlen = op->o_bd->be_nsuffix[0].bv_len;

            if ( min_dnlen == 0 )
                  min_dnlen = 1;       /* catch empty DN */

            for ( ; entry == NULL; ) {
                  dnParent( &pndn, &pndn );
                  if ( pndn.bv_len < min_dnlen ) {
                        break;
                  }

                  op->o_req_dn = pndn;
                  op->o_req_ndn = pndn;

                  get_entry( op, &entry, NULL );
            }

            ldap_pvt_thread_rdwr_runlock( &li->li_rdwr );

            op->o_req_dn = odn;
            op->o_req_ndn = ondn;

            rc = LDAP_SUCCESS;
            rs->sr_matched = NULL;
            if ( entry != NULL ) {
                  Debug( LDAP_DEBUG_TRACE,
                        "ldif_back_referrals: tag=%lu target=\"%s\" matched=\"%s\"\n",
                        (unsigned long) op->o_tag, op->o_req_dn.bv_val, entry->e_name.bv_val );

                  if ( is_entry_referral( entry ) ) {
                        rc = LDAP_OTHER;
                        rs->sr_ref = get_entry_referrals( op, entry );
                        if ( rs->sr_ref ) {
                              rs->sr_matched = ber_strdup_x(
                              entry->e_name.bv_val, op->o_tmpmemctx );
                        }
                  }

                  entry_free(entry);

            } else if ( default_referral != NULL ) {
                  rc = LDAP_OTHER;
                  rs->sr_ref = referral_rewrite( default_referral,
                        NULL, &op->o_req_dn, LDAP_SCOPE_DEFAULT );
            }

            if ( rs->sr_ref != NULL ) {
                  /* send referrals */
                  rc = rs->sr_err = LDAP_REFERRAL;
                  send_ldap_result( op, rs );
                  ber_bvarray_free( rs->sr_ref );
                  rs->sr_ref = NULL;

            } else if ( rc != LDAP_SUCCESS ) {
                  rs->sr_text = rs->sr_matched ? "bad referral object" : NULL;
            }

            if ( rs->sr_matched ) {
                  op->o_tmpfree( (char *)rs->sr_matched, op->o_tmpmemctx );
                  rs->sr_matched = NULL;
            }

            return rc;
      }

      ldap_pvt_thread_rdwr_runlock( &li->li_rdwr );

      if ( is_entry_referral( entry ) ) {
            /* entry is a referral */
            BerVarray refs = get_entry_referrals( op, entry );
            rs->sr_ref = referral_rewrite(
                  refs, &entry->e_name, &op->o_req_dn, LDAP_SCOPE_DEFAULT );

            Debug( LDAP_DEBUG_TRACE,
                  "ldif_back_referrals: tag=%lu target=\"%s\" matched=\"%s\"\n",
                  (unsigned long) op->o_tag, op->o_req_dn.bv_val, entry->e_name.bv_val );

            rs->sr_matched = entry->e_name.bv_val;
            if ( rs->sr_ref != NULL ) {
                  rc = rs->sr_err = LDAP_REFERRAL;
                  send_ldap_result( op, rs );
                  ber_bvarray_free( rs->sr_ref );
                  rs->sr_ref = NULL;

            } else {
                  rc = LDAP_OTHER;
                  rs->sr_text = "bad referral object";
            }

            rs->sr_matched = NULL;
            ber_bvarray_free( refs );
      }

      entry_free( entry );

      return rc;
}


/* LDAP operations */

static int
ldif_back_bind( Operation *op, SlapReply *rs )
{
      struct ldif_info *li;
      Attribute *a;
      AttributeDescription *password = slap_schema.si_ad_userPassword;
      int return_val;
      Entry *entry;

      switch ( be_rootdn_bind( op, rs ) ) {
      case SLAP_CB_CONTINUE:
            break;

      default:
            /* in case of success, front end will send result;
             * otherwise, be_rootdn_bind() did */
            return rs->sr_err;
      }

      li = (struct ldif_info *) op->o_bd->be_private;
      ldap_pvt_thread_rdwr_rlock(&li->li_rdwr);
      return_val = get_entry(op, &entry, NULL);

      /* no object is found for them */
      if(return_val != LDAP_SUCCESS) {
            rs->sr_err = return_val = LDAP_INVALID_CREDENTIALS;
            goto return_result;
      }

      /* they don't have userpassword */
      if((a = attr_find(entry->e_attrs, password)) == NULL) {
            rs->sr_err = LDAP_INAPPROPRIATE_AUTH;
            return_val = 1;
            goto return_result;
      }

      /* authentication actually failed */
      if(slap_passwd_check(op, entry, a, &op->oq_bind.rb_cred,
                       &rs->sr_text) != 0) {
            rs->sr_err = LDAP_INVALID_CREDENTIALS;
            return_val = 1;
            goto return_result;
      }

      /* let the front-end send success */
      return_val = 0;
      goto return_result;

 return_result:
      ldap_pvt_thread_rdwr_runlock(&li->li_rdwr);
      if(return_val != 0)
            send_ldap_result( op, rs );
      if(entry != NULL)
            entry_free(entry);
      return return_val;
}

static int ldif_back_search(Operation *op, SlapReply *rs)
{
      struct ldif_info *li = (struct ldif_info *) op->o_bd->be_private;
      enumCookie ck = { NULL, NULL, NULL, 0, 0 };

      ck.op = op;
      ck.rs = rs;
      ldap_pvt_thread_rdwr_rlock(&li->li_rdwr);
      rs->sr_err = enum_tree( &ck );
      ldap_pvt_thread_rdwr_runlock(&li->li_rdwr);
      send_ldap_result(op, rs);

      return rs->sr_err;
}

static int ldif_back_add(Operation *op, SlapReply *rs) {
      struct ldif_info *li = (struct ldif_info *) op->o_bd->be_private;
      Entry * e = op->ora_e;
      struct berval dn = e->e_nname;
      struct berval leaf_path = BER_BVNULL;
      struct stat stats;
      int statres;
      char textbuf[SLAP_TEXT_BUFLEN];

      Debug( LDAP_DEBUG_TRACE, "ldif_back_add: \"%s\"\n", dn.bv_val, 0, 0);

      rs->sr_err = entry_schema_check(op, e, NULL, 0, 1,
            &rs->sr_text, textbuf, sizeof( textbuf ) );
      if ( rs->sr_err != LDAP_SUCCESS ) goto send_res;

      rs->sr_err = slap_add_opattrs( op,
            &rs->sr_text, textbuf, sizeof( textbuf ), 1 );
      if ( rs->sr_err != LDAP_SUCCESS ) goto send_res;

      ldap_pvt_thread_rdwr_wlock(&li->li_rdwr);

      dn2path( op->o_bd, &dn, &leaf_path );

      if(leaf_path.bv_val != NULL) {
            struct berval base = BER_BVNULL;
            /* build path to container and ldif of container */
            get_parent_path(&leaf_path, &base);

            statres = stat(base.bv_val, &stats); /* check if container exists */
            if(statres == -1 && errno == ENOENT) { /* container missing */
                  base.bv_val[base.bv_len] = LDIF_FILETYPE_SEP;
                  statres = stat(base.bv_val, &stats); /* check for leaf node */
                  base.bv_val[base.bv_len] = '\0';
                  if(statres == -1 && errno == ENOENT) {
                        rs->sr_err = LDAP_NO_SUCH_OBJECT; /* parent doesn't exist */
                        rs->sr_text = "Parent does not exist";
                  }
                  else if(statres != -1) { /* create parent */
                        int mkdirres = mkdir(base.bv_val, 0750);
                        if(mkdirres == -1) {
                              rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
                              rs->sr_text = "Could not create parent folder";
                              Debug( LDAP_DEBUG_ANY, "could not create folder \"%s\": %s\n",
                                    base.bv_val, STRERROR( errno ), 0 );
                        }
                  }
                  else
                        rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
            }/* container was possibly created, move on to add the entry */
            if(rs->sr_err == LDAP_SUCCESS) {
                  statres = stat(leaf_path.bv_val, &stats);
                  if(statres == -1 && errno == ENOENT) {
                        rs->sr_err = spew_entry(e, &leaf_path, 1, NULL);
                  }
                  else if ( statres == -1 ) {
                        rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
                        Debug( LDAP_DEBUG_ANY, "could not stat file \"%s\": %s\n",
                              leaf_path.bv_val, STRERROR( errno ), 0 );
                  }
                  else /* it already exists */
                        rs->sr_err = LDAP_ALREADY_EXISTS;
            }
            SLAP_FREE(base.bv_val);
            SLAP_FREE(leaf_path.bv_val);
      }

      ldap_pvt_thread_rdwr_wunlock(&li->li_rdwr);

send_res:
      Debug( LDAP_DEBUG_TRACE, 
                  "ldif_back_add: err: %d text: %s\n", rs->sr_err, rs->sr_text ?
                        rs->sr_text : "", 0);
      send_ldap_result(op, rs);
      slap_graduate_commit_csn( op );
      return rs->sr_err;
}

static int ldif_back_modify(Operation *op, SlapReply *rs) {
      struct ldif_info *li = (struct ldif_info *) op->o_bd->be_private;
      Modifications * modlst = op->orm_modlist;
      struct berval path;
      Entry *entry;
      int spew_res;

      slap_mods_opattrs( op, &op->orm_modlist, 1 );

      ldap_pvt_thread_rdwr_wlock(&li->li_rdwr);

      rs->sr_err = get_entry( op, &entry, &path );
      if(entry != NULL) {
            rs->sr_err = apply_modify_to_entry(entry, modlst, op, rs);
            if(rs->sr_err == LDAP_SUCCESS) {
                  int save_errno;
                  spew_res = spew_entry(entry, &path, 1, &save_errno);
                  if(spew_res == -1) {
                        Debug( LDAP_DEBUG_ANY,
                              "%s ldif_back_modify: could not output entry \"%s\": %s\n",
                              op->o_log_prefix, entry->e_name.bv_val, STRERROR( save_errno ) );
                        rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
                  }
            }

            entry_free( entry );
            SLAP_FREE( path.bv_val );
      }

      rs->sr_text = NULL;
      ldap_pvt_thread_rdwr_wunlock(&li->li_rdwr);
      send_ldap_result(op, rs);
      slap_graduate_commit_csn( op );
      return rs->sr_err;
}

static int ldif_back_delete(Operation *op, SlapReply *rs) {
      struct ldif_info *li = (struct ldif_info *) op->o_bd->be_private;
      struct berval path;
      int res = 0;

      if ( BER_BVISEMPTY( &op->o_csn )) {
            struct berval csn;
            char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];

            csn.bv_val = csnbuf;
            csn.bv_len = sizeof( csnbuf );
            slap_get_csn( op, &csn, 1 );
      }

      ldap_pvt_thread_rdwr_wlock(&li->li_rdwr);

      dn2path( op->o_bd, &op->o_req_ndn, &path );
      path.bv_val[path.bv_len - STRLENOF(LDIF)] = '\0';
      res = rmdir(path.bv_val);
      path.bv_val[path.bv_len - STRLENOF(LDIF)] = LDIF_FILETYPE_SEP;
      rs->sr_err = LDAP_SUCCESS;
      if ( res ) {
            switch ( errno ) {
            case ENOTEMPTY:
                  rs->sr_err = LDAP_NOT_ALLOWED_ON_NONLEAF;
                  break;

            case ENOENT:
                  /* is leaf, go on */
                  res = 0;
                  break;

            default:
                  rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
                  break;
            }
      }

      if ( !res ) {
            res = unlink(path.bv_val);
            if ( res == -1 ) {
                  switch ( errno ) {
                  case ENOENT:
                        rs->sr_err = LDAP_NO_SUCH_OBJECT;
                        break;

                  default:
                        rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
                        break;
                  }
            }
      }

      SLAP_FREE(path.bv_val);
      ldap_pvt_thread_rdwr_wunlock(&li->li_rdwr);
      send_ldap_result(op, rs);
      slap_graduate_commit_csn( op );
      return rs->sr_err;
}


static int
ldif_move_entry(
      Operation *op,
      Entry *entry,
      struct berval *oldpath )
{
      int res;
      int exists_res;
      struct berval newpath;

      dn2path( op->o_bd, &entry->e_nname, &newpath );

      if((entry == NULL || oldpath->bv_val == NULL) || newpath.bv_val == NULL) {
            /* some object doesn't exist */
            res = LDAP_NO_SUCH_OBJECT;
      }
      else { /* do the modrdn */
            exists_res = open(newpath.bv_val, O_RDONLY);
            if(exists_res == -1 && errno == ENOENT) {
                  ldap_pvt_thread_mutex_lock( &entry2str_mutex );
                  res = spew_entry(entry, &newpath, 0, NULL);
                  if(res != -1) {
                        /* if this fails we should log something bad */
                        res = unlink( oldpath->bv_val );
                        oldpath->bv_val[oldpath->bv_len - STRLENOF(".ldif")] = '\0';
                        newpath.bv_val[newpath.bv_len - STRLENOF(".ldif")] = '\0';
                        res = rename( oldpath->bv_val, newpath.bv_val );
                        res = LDAP_SUCCESS;
                  }
                  else {
                        if(errno == ENOENT)
                              res = LDAP_NO_SUCH_OBJECT;
                        else
                              res = LDAP_UNWILLING_TO_PERFORM;
                        unlink(newpath.bv_val); /* in case file was created */
                  }
                  ldap_pvt_thread_mutex_unlock( &entry2str_mutex );
            }
            else if(exists_res) {
                  int close_res = close(exists_res);
                  res = LDAP_ALREADY_EXISTS;
                  if(close_res == -1) {
                  /* log heinous error */
                  }
            }
            else {
                  res = LDAP_UNWILLING_TO_PERFORM;
            }
      }

      if(newpath.bv_val != NULL)
            SLAP_FREE(newpath.bv_val);
      return res;
}

static int
ldif_back_modrdn(Operation *op, SlapReply *rs)
{
      struct ldif_info *li = (struct ldif_info *) op->o_bd->be_private;
      struct berval new_dn = BER_BVNULL, new_ndn = BER_BVNULL;
      struct berval p_dn, old_path;
      Entry *entry;
      int rc;

      slap_mods_opattrs( op, &op->orr_modlist, 1 );

      ldap_pvt_thread_rdwr_wlock( &li->li_rdwr );

      rc = get_entry( op, &entry, &old_path );
      if ( rc == LDAP_SUCCESS ) {
            /* build new dn, and new ndn for the entry */
            if ( op->oq_modrdn.rs_newSup != NULL ) {
                  struct berval     op_dn = op->o_req_dn,
                              op_ndn = op->o_req_ndn;
                  Entry       *np;

                  /* new superior */
                  p_dn = *op->oq_modrdn.rs_newSup;
                  op->o_req_dn = *op->oq_modrdn.rs_newSup;
                  op->o_req_ndn = *op->oq_modrdn.rs_nnewSup;
                  rc = get_entry( op, &np, NULL );
                  op->o_req_dn = op_dn;
                  op->o_req_ndn = op_ndn;
                  if ( rc != LDAP_SUCCESS ) {
                        goto no_such_object;
                  }
                  entry_free( np );
            } else {
                  dnParent( &entry->e_name, &p_dn );
            }
            build_new_dn( &new_dn, &p_dn, &op->oq_modrdn.rs_newrdn, NULL ); 
            dnNormalize( 0, NULL, NULL, &new_dn, &new_ndn, NULL );
            ber_memfree_x( entry->e_name.bv_val, NULL );
            ber_memfree_x( entry->e_nname.bv_val, NULL );
            entry->e_name = new_dn;
            entry->e_nname = new_ndn;

            /* perform the modifications */
            rc = apply_modify_to_entry( entry, op->orr_modlist, op, rs );
            if ( rc == LDAP_SUCCESS )
                  rc = ldif_move_entry( op, entry, &old_path );

no_such_object:;
            entry_free( entry );
            SLAP_FREE( old_path.bv_val );
      }

      rs->sr_text = "";
      ldap_pvt_thread_rdwr_wunlock( &li->li_rdwr );
      rs->sr_err = rc;
      send_ldap_result( op, rs );
      slap_graduate_commit_csn( op );
      return rs->sr_err;
}


/* Return LDAP_SUCCESS IFF we retrieve the specified entry. */
static int
ldif_back_entry_get(
      Operation *op,
      struct berval *ndn,
      ObjectClass *oc,
      AttributeDescription *at,
      int rw,
      Entry **e )
{
      struct ldif_info *li = (struct ldif_info *) op->o_bd->be_private;
      struct berval op_dn = op->o_req_dn, op_ndn = op->o_req_ndn;
      int rc;

      assert( ndn != NULL );
      assert( !BER_BVISNULL( ndn ) );

      ldap_pvt_thread_rdwr_rlock( &li->li_rdwr );
      op->o_req_dn = *ndn;
      op->o_req_ndn = *ndn;
      rc = get_entry( op, e, NULL );
      op->o_req_dn = op_dn;
      op->o_req_ndn = op_ndn;
      ldap_pvt_thread_rdwr_runlock( &li->li_rdwr );

      if ( rc == LDAP_SUCCESS && oc && !is_entry_objectclass_or_sub( *e, oc ) ) {
            rc = LDAP_NO_SUCH_ATTRIBUTE;
            entry_free( *e );
            *e = NULL;
      }

      return rc;
}


/* Slap tools */

static int ldif_tool_entry_open(BackendDB *be, int mode) {
      struct ldif_info *li = (struct ldif_info *) be->be_private;
      li->li_tool_current = 0;
      return 0;
}                             

static int ldif_tool_entry_close(BackendDB * be) {
      struct ldif_info *li = (struct ldif_info *) be->be_private;

      SLAP_FREE(li->li_tool_cookie.entries);
      return 0;
}

static ID ldif_tool_entry_next(BackendDB *be)
{
      struct ldif_info *li = (struct ldif_info *) be->be_private;
      if(li->li_tool_current >= li->li_tool_cookie.eind)
            return NOID;
      else
            return ++li->li_tool_current;
}

static ID
ldif_tool_entry_first(BackendDB *be)
{
      struct ldif_info *li = (struct ldif_info *) be->be_private;

      if(li->li_tool_cookie.entries == NULL) {
            Operation op = {0};

            op.o_bd = be;
            op.o_req_dn = *be->be_suffix;
            op.o_req_ndn = *be->be_nsuffix;
            op.ors_scope = LDAP_SCOPE_SUBTREE;
            li->li_tool_cookie.op = &op;
            (void)enum_tree( &li->li_tool_cookie );
            li->li_tool_cookie.op = NULL;
      }
      return ldif_tool_entry_next( be );
}

static Entry * ldif_tool_entry_get(BackendDB * be, ID id) {
      struct ldif_info *li = (struct ldif_info *) be->be_private;
      Entry * e;

      if(id > li->li_tool_cookie.eind || id < 1)
            return NULL;
      else {
            e = li->li_tool_cookie.entries[id - 1];
            li->li_tool_cookie.entries[id - 1] = NULL;
            return e;
      }
}

static ID ldif_tool_entry_put(BackendDB * be, Entry * e, struct berval *text) {
      struct berval leaf_path = BER_BVNULL;
      struct stat stats;
      int statres;
      int res = LDAP_SUCCESS;

      dn2path( be, &e->e_nname, &leaf_path );

      if(leaf_path.bv_val != NULL) {
            struct berval base = BER_BVNULL;
            /* build path to container, and path to ldif of container */
            get_parent_path(&leaf_path, &base);

            statres = stat(base.bv_val, &stats); /* check if container exists */
            if(statres == -1 && errno == ENOENT) { /* container missing */
                  base.bv_val[base.bv_len] = LDIF_FILETYPE_SEP;
                  statres = stat(base.bv_val, &stats); /* check for leaf node */
                  base.bv_val[base.bv_len] = '\0';
                  if(statres == -1 && errno == ENOENT) {
                        res = LDAP_NO_SUCH_OBJECT; /* parent doesn't exist */
                  }
                  else if(statres != -1) { /* create parent */
                        int mkdirres = mkdir(base.bv_val, 0750);
                        if(mkdirres == -1) {
                              res = LDAP_UNWILLING_TO_PERFORM;
                        }
                  }
                  else
                        res = LDAP_UNWILLING_TO_PERFORM;
            }/* container was possibly created, move on to add the entry */
            if(res == LDAP_SUCCESS) {
                  statres = stat(leaf_path.bv_val, &stats);
                  if(statres == -1 && errno == ENOENT) {
                        res = spew_entry(e, &leaf_path, 0, NULL);
                  }
                  else /* it already exists */
                        res = LDAP_ALREADY_EXISTS;
            }
            SLAP_FREE(base.bv_val);
            SLAP_FREE(leaf_path.bv_val);
      }

      if(res == LDAP_SUCCESS) {
            return 1;
      }
      else
            return NOID;
}


/* Setup */

static int
ldif_back_db_init( BackendDB *be, ConfigReply *cr )
{
      struct ldif_info *li;

      li = ch_calloc( 1, sizeof(struct ldif_info) );
      be->be_private = li;
      be->be_cf_ocs = ldifocs;
      ldap_pvt_thread_rdwr_init(&li->li_rdwr);
      SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_ONE_SUFFIX;
      return 0;
}

static int
ldif_back_db_destroy( Backend *be, ConfigReply *cr )
{
      struct ldif_info *li = be->be_private;

      ch_free(li->li_base_path.bv_val);
      ldap_pvt_thread_rdwr_destroy(&li->li_rdwr);
      free( be->be_private );
      return 0;
}

static int
ldif_back_db_open( Backend *be, ConfigReply *cr)
{
      struct ldif_info *li = (struct ldif_info *) be->be_private;
      if( BER_BVISEMPTY(&li->li_base_path)) {/* missing base path */
            Debug( LDAP_DEBUG_ANY, "missing base path for back-ldif\n", 0, 0, 0);
            return 1;
      }
      return 0;
}

int
ldif_back_initialize(
                     BackendInfo    *bi
                     )
{
      static char *controls[] = {
            LDAP_CONTROL_MANAGEDSAIT,
            NULL
      };
      int rc;

      bi->bi_flags |=
            SLAP_BFLAG_INCREMENT |
            SLAP_BFLAG_REFERRALS;

      bi->bi_controls = controls;

      bi->bi_open = 0;
      bi->bi_close = 0;
      bi->bi_config = 0;
      bi->bi_destroy = 0;

      bi->bi_db_init = ldif_back_db_init;
      bi->bi_db_config = config_generic_wrapper;
      bi->bi_db_open = ldif_back_db_open;
      bi->bi_db_close = 0;
      bi->bi_db_destroy = ldif_back_db_destroy;

      bi->bi_op_bind = ldif_back_bind;
      bi->bi_op_unbind = 0;
      bi->bi_op_search = ldif_back_search;
      bi->bi_op_compare = 0;
      bi->bi_op_modify = ldif_back_modify;
      bi->bi_op_modrdn = ldif_back_modrdn;
      bi->bi_op_add = ldif_back_add;
      bi->bi_op_delete = ldif_back_delete;
      bi->bi_op_abandon = 0;

      bi->bi_extended = 0;

      bi->bi_chk_referrals = ldif_back_referrals;

      bi->bi_connection_init = 0;
      bi->bi_connection_destroy = 0;

      bi->bi_entry_get_rw = ldif_back_entry_get;

#if 0 /* NOTE: uncomment to completely disable access control */
      bi->bi_access_allowed = slap_access_always_allowed;
#endif

      bi->bi_tool_entry_open = ldif_tool_entry_open;
      bi->bi_tool_entry_close = ldif_tool_entry_close;
      bi->bi_tool_entry_first = ldif_tool_entry_first;
      bi->bi_tool_entry_next = ldif_tool_entry_next;
      bi->bi_tool_entry_get = ldif_tool_entry_get;
      bi->bi_tool_entry_put = ldif_tool_entry_put;
      bi->bi_tool_entry_reindex = 0;
      bi->bi_tool_sync = 0;
      
      bi->bi_tool_dn2id_get = 0;
      bi->bi_tool_entry_modify = 0;

      bi->bi_cf_ocs = ldifocs;

      rc = config_register_schema( ldifcfg, ldifocs );
      if ( rc ) return rc;
      return 0;
}

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