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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:35:32 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:35:32 +0000
commit5ea77a75dd2d2158401331879f3c8f47940a732c (patch)
treed89dc06e9f4850a900f161e25f84e922c4f86cc8 /servers/slapd/back-mdb/dn2id.c
parentInitial commit. (diff)
downloadopenldap-upstream.tar.xz
openldap-upstream.zip
Adding upstream version 2.5.13+dfsg.upstream/2.5.13+dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'servers/slapd/back-mdb/dn2id.c')
-rw-r--r--servers/slapd/back-mdb/dn2id.c981
1 files changed, 981 insertions, 0 deletions
diff --git a/servers/slapd/back-mdb/dn2id.c b/servers/slapd/back-mdb/dn2id.c
new file mode 100644
index 0000000..68000ca
--- /dev/null
+++ b/servers/slapd/back-mdb/dn2id.c
@@ -0,0 +1,981 @@
+/* dn2id.c - routines to deal with the dn2id index */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 2000-2022 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>.
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+#include <ac/string.h>
+
+#include "back-mdb.h"
+#include "idl.h"
+#include "lutil.h"
+
+/* Management routines for a hierarchically structured database.
+ *
+ * Instead of a ldbm-style dn2id database, we use a hierarchical one. Each
+ * entry in this database is a struct diskNode, keyed by entryID and with
+ * the data containing the RDN and entryID of the node's children. We use
+ * a B-Tree with sorted duplicates to store all the children of a node under
+ * the same key. Also, the first item under the key contains the entry's own
+ * rdn and the ID of the node's parent, to allow bottom-up tree traversal as
+ * well as top-down. To keep this info first in the list, the high bit of all
+ * subsequent nrdnlen's is always set. This means we can only accommodate
+ * RDNs up to length 32767, but that's fine since full DNs are already
+ * restricted to 8192.
+ *
+ * Also each child node contains a count of the number of entries in
+ * its subtree, appended after its entryID.
+ *
+ * The diskNode is a variable length structure. This definition is not
+ * directly usable for in-memory manipulation.
+ */
+typedef struct diskNode {
+ unsigned char nrdnlen[2];
+ char nrdn[1];
+ char rdn[1]; /* variable placement */
+ unsigned char entryID[sizeof(ID)]; /* variable placement */
+ /* unsigned char nsubs[sizeof(ID)]; in child nodes only */
+} diskNode;
+
+/* Sort function for the sorted duplicate data items of a dn2id key.
+ * Sorts based on normalized RDN, in length order.
+ */
+int
+mdb_dup_compare(
+ const MDB_val *usrkey,
+ const MDB_val *curkey
+)
+{
+ diskNode *un, *cn;
+ int rc, nrlen;
+
+ un = (diskNode *)usrkey->mv_data;
+ cn = (diskNode *)curkey->mv_data;
+
+ /* data is not aligned, cannot compare directly */
+ rc = un->nrdnlen[0] - cn->nrdnlen[0];
+ if ( rc ) return rc;
+ rc = un->nrdnlen[1] - cn->nrdnlen[1];
+ if ( rc ) return rc;
+
+ nrlen = ((un->nrdnlen[0] & 0x7f) << 8) | un->nrdnlen[1];
+ return strncmp( un->nrdn, cn->nrdn, nrlen );
+}
+
+/* We add two elements to the DN2ID database - a data item under the parent's
+ * entryID containing the child's RDN and entryID, and an item under the
+ * child's entryID containing the parent's entryID.
+ */
+int
+mdb_dn2id_add(
+ Operation *op,
+ MDB_cursor *mcp,
+ MDB_cursor *mcd,
+ ID pid,
+ ID nsubs,
+ int upsub,
+ Entry *e )
+{
+ struct mdb_info *mdb = (struct mdb_info *) op->o_bd->be_private;
+ MDB_val key, data;
+ ID nid;
+ int rc, rlen, nrlen;
+ diskNode *d;
+ char *ptr;
+
+ Debug( LDAP_DEBUG_TRACE, "=> mdb_dn2id_add 0x%lx: \"%s\"\n",
+ e->e_id, e->e_ndn ? e->e_ndn : "" );
+
+ nrlen = dn_rdnlen( op->o_bd, &e->e_nname );
+ if (nrlen) {
+ rlen = dn_rdnlen( op->o_bd, &e->e_name );
+ } else {
+ nrlen = e->e_nname.bv_len;
+ rlen = e->e_name.bv_len;
+ }
+
+ d = op->o_tmpalloc(sizeof(diskNode) + rlen + nrlen + sizeof(ID), op->o_tmpmemctx);
+ d->nrdnlen[1] = nrlen & 0xff;
+ d->nrdnlen[0] = (nrlen >> 8) | 0x80;
+ ptr = lutil_strncopy( d->nrdn, e->e_nname.bv_val, nrlen );
+ *ptr++ = '\0';
+ ptr = lutil_strncopy( ptr, e->e_name.bv_val, rlen );
+ *ptr++ = '\0';
+ memcpy( ptr, &e->e_id, sizeof( ID ));
+ ptr += sizeof( ID );
+ memcpy( ptr, &nsubs, sizeof( ID ));
+
+ key.mv_size = sizeof(ID);
+ key.mv_data = &nid;
+
+ nid = pid;
+
+ /* Need to make dummy root node once. Subsequent attempts
+ * will fail harmlessly.
+ */
+ if ( pid == 0 ) {
+ diskNode dummy = {{0, 0}, "", "", ""};
+ data.mv_data = &dummy;
+ data.mv_size = sizeof(diskNode);
+
+ mdb_cursor_put( mcp, &key, &data, MDB_NODUPDATA );
+ }
+
+ data.mv_data = d;
+ data.mv_size = sizeof(diskNode) + rlen + nrlen + sizeof( ID );
+
+ /* Add our child node under parent's key */
+ rc = mdb_cursor_put( mcp, &key, &data, MDB_NODUPDATA );
+
+ /* Add our own node */
+ if (rc == 0) {
+ int flag = MDB_NODUPDATA;
+ nid = e->e_id;
+ /* drop subtree count */
+ data.mv_size -= sizeof( ID );
+ ptr -= sizeof( ID );
+ memcpy( ptr, &pid, sizeof( ID ));
+ d->nrdnlen[0] ^= 0x80;
+
+ if ((slapMode & SLAP_TOOL_MODE) || (e->e_id == mdb->mi_nextid))
+ flag |= MDB_APPEND;
+ rc = mdb_cursor_put( mcd, &key, &data, flag );
+ }
+ op->o_tmpfree( d, op->o_tmpmemctx );
+
+ /* Add our subtree count to all superiors */
+ if ( rc == 0 && upsub && pid ) {
+ ID subs;
+ nid = pid;
+ do {
+ /* Get parent's RDN */
+ rc = mdb_cursor_get( mcp, &key, &data, MDB_SET );
+ if ( !rc ) {
+ char *p2;
+ ptr = (char *)data.mv_data + data.mv_size - sizeof( ID );
+ memcpy( &nid, ptr, sizeof( ID ));
+ /* Get parent's node under grandparent */
+ d = data.mv_data;
+ rlen = ( d->nrdnlen[0] << 8 ) | d->nrdnlen[1];
+ p2 = op->o_tmpalloc( rlen + 2, op->o_tmpmemctx );
+ memcpy( p2, data.mv_data, rlen+2 );
+ *p2 ^= 0x80;
+ data.mv_data = p2;
+ rc = mdb_cursor_get( mcp, &key, &data, MDB_GET_BOTH );
+ op->o_tmpfree( p2, op->o_tmpmemctx );
+ if ( !rc ) {
+ /* Get parent's subtree count */
+ ptr = (char *)data.mv_data + data.mv_size - sizeof( ID );
+ memcpy( &subs, ptr, sizeof( ID ));
+ subs += nsubs;
+ p2 = op->o_tmpalloc( data.mv_size, op->o_tmpmemctx );
+ memcpy( p2, data.mv_data, data.mv_size - sizeof( ID ));
+ memcpy( p2+data.mv_size - sizeof( ID ), &subs, sizeof( ID ));
+ data.mv_data = p2;
+ rc = mdb_cursor_put( mcp, &key, &data, MDB_CURRENT );
+ op->o_tmpfree( p2, op->o_tmpmemctx );
+ }
+ }
+ if ( rc )
+ break;
+ } while ( nid );
+ }
+
+ Debug( LDAP_DEBUG_TRACE, "<= mdb_dn2id_add 0x%lx: %d\n", e->e_id, rc );
+
+ return rc;
+}
+
+/* mc must have been set by mdb_dn2id */
+int
+mdb_dn2id_delete(
+ Operation *op,
+ MDB_cursor *mc,
+ ID id,
+ ID nsubs )
+{
+ ID nid;
+ char *ptr;
+ int rc;
+
+ Debug( LDAP_DEBUG_TRACE, "=> mdb_dn2id_delete 0x%lx\n",
+ id );
+
+ /* Delete our ID from the parent's list */
+ rc = mdb_cursor_del( mc, 0 );
+
+ /* Delete our ID from the tree. With sorted duplicates, this
+ * will leave any child nodes still hanging around. This is OK
+ * for modrdn, which will add our info back in later.
+ */
+ if ( rc == 0 ) {
+ MDB_val key, data;
+ if ( nsubs ) {
+ mdb_cursor_get( mc, &key, NULL, MDB_GET_CURRENT );
+ memcpy( &nid, key.mv_data, sizeof( ID ));
+ }
+ key.mv_size = sizeof(ID);
+ key.mv_data = &id;
+ rc = mdb_cursor_get( mc, &key, &data, MDB_SET );
+ if ( rc == 0 )
+ rc = mdb_cursor_del( mc, 0 );
+ }
+
+ /* Delete our subtree count from all superiors */
+ if ( rc == 0 && nsubs && nid ) {
+ MDB_val key, data;
+ ID subs;
+ key.mv_data = &nid;
+ key.mv_size = sizeof( ID );
+ do {
+ rc = mdb_cursor_get( mc, &key, &data, MDB_SET );
+ if ( !rc ) {
+ char *p2;
+ diskNode *d;
+ int rlen;
+ ptr = (char *)data.mv_data + data.mv_size - sizeof( ID );
+ memcpy( &nid, ptr, sizeof( ID ));
+ /* Get parent's node under grandparent */
+ d = data.mv_data;
+ rlen = ( d->nrdnlen[0] << 8 ) | d->nrdnlen[1];
+ p2 = op->o_tmpalloc( rlen + 2, op->o_tmpmemctx );
+ memcpy( p2, data.mv_data, rlen+2 );
+ *p2 ^= 0x80;
+ data.mv_data = p2;
+ rc = mdb_cursor_get( mc, &key, &data, MDB_GET_BOTH );
+ op->o_tmpfree( p2, op->o_tmpmemctx );
+ if ( !rc ) {
+ /* Get parent's subtree count */
+ ptr = (char *)data.mv_data + data.mv_size - sizeof( ID );
+ memcpy( &subs, ptr, sizeof( ID ));
+ subs -= nsubs;
+ p2 = op->o_tmpalloc( data.mv_size, op->o_tmpmemctx );
+ memcpy( p2, data.mv_data, data.mv_size - sizeof( ID ));
+ memcpy( p2+data.mv_size - sizeof( ID ), &subs, sizeof( ID ));
+ data.mv_data = p2;
+ rc = mdb_cursor_put( mc, &key, &data, MDB_CURRENT );
+ op->o_tmpfree( p2, op->o_tmpmemctx );
+ }
+
+ }
+ if ( rc )
+ break;
+ } while ( nid );
+ }
+
+ Debug( LDAP_DEBUG_TRACE, "<= mdb_dn2id_delete 0x%lx: %d\n", id, rc );
+ return rc;
+}
+
+/* return last found ID in *id if no match
+ * If mc is provided, it will be left pointing to the RDN's
+ * record under the parent's ID. If nsubs is provided, return
+ * the number of entries in this entry's subtree.
+ */
+int
+mdb_dn2id(
+ Operation *op,
+ MDB_txn *txn,
+ MDB_cursor *mc,
+ struct berval *in,
+ ID *id,
+ ID *nsubs,
+ struct berval *matched,
+ struct berval *nmatched )
+{
+ struct mdb_info *mdb = (struct mdb_info *) op->o_bd->be_private;
+ MDB_cursor *cursor;
+ MDB_dbi dbi = mdb->mi_dn2id;
+ MDB_val key, data;
+ int rc = 0, nrlen;
+ diskNode *d;
+ char *ptr;
+ char dn[SLAP_LDAPDN_MAXLEN];
+ ID pid, nid;
+ struct berval tmp;
+
+ Debug( LDAP_DEBUG_TRACE, "=> mdb_dn2id(\"%s\")\n", in->bv_val ? in->bv_val : "" );
+
+ if ( matched ) {
+ matched->bv_val = dn + sizeof(dn) - 1;
+ matched->bv_len = 0;
+ *matched->bv_val-- = '\0';
+ }
+ if ( nmatched ) {
+ nmatched->bv_len = 0;
+ nmatched->bv_val = 0;
+ }
+
+ if ( !in->bv_len ) {
+ *id = 0;
+ nid = 0;
+ goto done;
+ }
+
+ tmp = *in;
+
+ if ( op->o_bd->be_nsuffix[0].bv_len ) {
+ nrlen = tmp.bv_len - op->o_bd->be_nsuffix[0].bv_len;
+ tmp.bv_val += nrlen;
+ tmp.bv_len = op->o_bd->be_nsuffix[0].bv_len;
+ } else {
+ for ( ptr = tmp.bv_val + tmp.bv_len - 1; ptr >= tmp.bv_val; ptr-- )
+ if (DN_SEPARATOR(*ptr))
+ break;
+ ptr++;
+ tmp.bv_len -= ptr - tmp.bv_val;
+ tmp.bv_val = ptr;
+ }
+ nid = 0;
+ key.mv_size = sizeof(ID);
+
+ if ( mc ) {
+ cursor = mc;
+ } else {
+ rc = mdb_cursor_open( txn, dbi, &cursor );
+ if ( rc ) goto done;
+ }
+
+ for (;;) {
+ key.mv_data = &pid;
+ pid = nid;
+
+ data.mv_size = sizeof(diskNode) + tmp.bv_len;
+ d = op->o_tmpalloc( data.mv_size, op->o_tmpmemctx );
+ d->nrdnlen[1] = tmp.bv_len & 0xff;
+ d->nrdnlen[0] = (tmp.bv_len >> 8) | 0x80;
+ ptr = lutil_strncopy( d->nrdn, tmp.bv_val, tmp.bv_len );
+ *ptr = '\0';
+ data.mv_data = d;
+ rc = mdb_cursor_get( cursor, &key, &data, MDB_GET_BOTH );
+ op->o_tmpfree( d, op->o_tmpmemctx );
+ if ( rc )
+ break;
+ ptr = (char *) data.mv_data + data.mv_size - 2*sizeof(ID);
+ memcpy( &nid, ptr, sizeof(ID));
+
+ /* grab the non-normalized RDN */
+ if ( matched ) {
+ int rlen;
+ d = data.mv_data;
+ rlen = data.mv_size - sizeof(diskNode) - tmp.bv_len - sizeof(ID);
+ matched->bv_len += rlen;
+ matched->bv_val -= rlen + 1;
+ ptr = lutil_strcopy( matched->bv_val, d->rdn + tmp.bv_len );
+ if ( pid ) {
+ *ptr = ',';
+ matched->bv_len++;
+ }
+ }
+ if ( nmatched ) {
+ nmatched->bv_val = tmp.bv_val;
+ }
+
+ if ( tmp.bv_val > in->bv_val ) {
+ for (ptr = tmp.bv_val - 2; ptr > in->bv_val &&
+ !DN_SEPARATOR(*ptr); ptr--) /* empty */;
+ if ( ptr >= in->bv_val ) {
+ if (DN_SEPARATOR(*ptr)) ptr++;
+ tmp.bv_len = tmp.bv_val - ptr - 1;
+ tmp.bv_val = ptr;
+ }
+ } else {
+ break;
+ }
+ }
+ *id = nid;
+ /* return subtree count if requested */
+ if ( !rc && nsubs ) {
+ ptr = (char *)data.mv_data + data.mv_size - sizeof(ID);
+ memcpy( nsubs, ptr, sizeof( ID ));
+ }
+ if ( !mc )
+ mdb_cursor_close( cursor );
+done:
+ if ( matched ) {
+ if ( matched->bv_len ) {
+ ptr = op->o_tmpalloc( matched->bv_len+1, op->o_tmpmemctx );
+ strcpy( ptr, matched->bv_val );
+ matched->bv_val = ptr;
+ } else {
+ if ( BER_BVISEMPTY( &op->o_bd->be_nsuffix[0] ) && !nid ) {
+ ber_dupbv( matched, (struct berval *)&slap_empty_bv );
+ } else {
+ matched->bv_val = NULL;
+ }
+ }
+ }
+ if ( nmatched ) {
+ if ( nmatched->bv_val ) {
+ nmatched->bv_len = in->bv_len - (nmatched->bv_val - in->bv_val);
+ } else {
+ *nmatched = slap_empty_bv;
+ }
+ }
+
+ if( rc != 0 ) {
+ Debug( LDAP_DEBUG_TRACE, "<= mdb_dn2id: get failed: %s (%d)\n",
+ mdb_strerror( rc ), rc );
+ } else {
+ Debug( LDAP_DEBUG_TRACE, "<= mdb_dn2id: got id=0x%lx\n",
+ nid );
+ }
+
+ return rc;
+}
+
+/* return IDs from root to parent of DN */
+int
+mdb_dn2sups(
+ Operation *op,
+ MDB_txn *txn,
+ struct berval *in,
+ ID *ids )
+{
+ struct mdb_info *mdb = (struct mdb_info *) op->o_bd->be_private;
+ MDB_cursor *cursor;
+ MDB_dbi dbi = mdb->mi_dn2id;
+ MDB_val key, data;
+ int rc = 0, nrlen;
+ diskNode *d;
+ char *ptr;
+ ID pid, nid;
+ struct berval tmp;
+
+ Debug( LDAP_DEBUG_TRACE, "=> mdb_dn2sups(\"%s\")\n", in->bv_val );
+
+ if ( !in->bv_len ) {
+ goto done;
+ }
+
+ tmp = *in;
+
+ nrlen = tmp.bv_len - op->o_bd->be_nsuffix[0].bv_len;
+ tmp.bv_val += nrlen;
+ tmp.bv_len = op->o_bd->be_nsuffix[0].bv_len;
+ nid = 0;
+ key.mv_size = sizeof(ID);
+
+ rc = mdb_cursor_open( txn, dbi, &cursor );
+ if ( rc ) goto done;
+
+ for (;;) {
+ key.mv_data = &pid;
+ pid = nid;
+
+ data.mv_size = sizeof(diskNode) + tmp.bv_len;
+ d = op->o_tmpalloc( data.mv_size, op->o_tmpmemctx );
+ d->nrdnlen[1] = tmp.bv_len & 0xff;
+ d->nrdnlen[0] = (tmp.bv_len >> 8) | 0x80;
+ ptr = lutil_strncopy( d->nrdn, tmp.bv_val, tmp.bv_len );
+ *ptr = '\0';
+ data.mv_data = d;
+ rc = mdb_cursor_get( cursor, &key, &data, MDB_GET_BOTH );
+ op->o_tmpfree( d, op->o_tmpmemctx );
+ if ( rc )
+ break;
+ ptr = (char *) data.mv_data + data.mv_size - 2*sizeof(ID);
+ memcpy( &nid, ptr, sizeof(ID));
+
+ if ( pid )
+ mdb_idl_insert( ids, pid );
+
+ if ( tmp.bv_val > in->bv_val ) {
+ for (ptr = tmp.bv_val - 2; ptr > in->bv_val &&
+ !DN_SEPARATOR(*ptr); ptr--) /* empty */;
+ if ( ptr >= in->bv_val ) {
+ if (DN_SEPARATOR(*ptr)) ptr++;
+ tmp.bv_len = tmp.bv_val - ptr - 1;
+ tmp.bv_val = ptr;
+ }
+ } else {
+ break;
+ }
+ }
+ mdb_cursor_close( cursor );
+done:
+ if( rc != 0 ) {
+ Debug( LDAP_DEBUG_TRACE, "<= mdb_dn2sups: get failed: %s (%d)\n",
+ mdb_strerror( rc ), rc );
+ }
+
+ return rc;
+}
+
+int
+mdb_dn2id_children(
+ Operation *op,
+ MDB_txn *txn,
+ Entry *e )
+{
+ struct mdb_info *mdb = (struct mdb_info *) op->o_bd->be_private;
+ MDB_dbi dbi = mdb->mi_dn2id;
+ MDB_val key, data;
+ MDB_cursor *cursor;
+ int rc;
+ ID id;
+
+ key.mv_size = sizeof(ID);
+ key.mv_data = &id;
+ id = e->e_id;
+
+ rc = mdb_cursor_open( txn, dbi, &cursor );
+ if ( rc ) return rc;
+
+ rc = mdb_cursor_get( cursor, &key, &data, MDB_SET );
+ if ( rc == 0 ) {
+ size_t dkids;
+ rc = mdb_cursor_count( cursor, &dkids );
+ if ( rc == 0 ) {
+ if ( dkids < 2 ) rc = MDB_NOTFOUND;
+ }
+ }
+ mdb_cursor_close( cursor );
+ return rc;
+}
+
+int
+mdb_id2name(
+ Operation *op,
+ MDB_txn *txn,
+ MDB_cursor **cursp,
+ ID id,
+ struct berval *name,
+ struct berval *nname )
+{
+ struct mdb_info *mdb = (struct mdb_info *) op->o_bd->be_private;
+ MDB_dbi dbi = mdb->mi_dn2id;
+ MDB_val key, data;
+ MDB_cursor *cursor;
+ int rc, len, nlen;
+ char dn[SLAP_LDAPDN_MAXLEN], ndn[SLAP_LDAPDN_MAXLEN], *ptr;
+ char *dptr, *nptr;
+ diskNode *d;
+
+ key.mv_size = sizeof(ID);
+
+ if ( !*cursp ) {
+ rc = mdb_cursor_open( txn, dbi, cursp );
+ if ( rc ) return rc;
+ }
+ cursor = *cursp;
+
+ len = 0;
+ nlen = 0;
+ dptr = dn;
+ nptr = ndn;
+ while (id) {
+ unsigned int nrlen, rlen;
+ key.mv_data = &id;
+ data.mv_size = 0;
+ data.mv_data = "";
+ rc = mdb_cursor_get( cursor, &key, &data, MDB_SET );
+ if ( rc ) break;
+ ptr = data.mv_data;
+ ptr += data.mv_size - sizeof(ID);
+ memcpy( &id, ptr, sizeof(ID) );
+ d = data.mv_data;
+ nrlen = (d->nrdnlen[0] << 8) | d->nrdnlen[1];
+ rlen = data.mv_size - sizeof(diskNode) - nrlen;
+ assert( nrlen < 1024 && rlen < 1024 ); /* FIXME: Sanity check */
+ if (nptr > ndn) {
+ *nptr++ = ',';
+ *dptr++ = ',';
+ }
+ /* copy name and trailing NUL */
+ memcpy( nptr, d->nrdn, nrlen+1 );
+ memcpy( dptr, d->nrdn+nrlen+1, rlen+1 );
+ nptr += nrlen;
+ dptr += rlen;
+ }
+ if ( rc == 0 ) {
+ name->bv_len = dptr - dn;
+ nname->bv_len = nptr - ndn;
+ name->bv_val = op->o_tmpalloc( name->bv_len + 1, op->o_tmpmemctx );
+ nname->bv_val = op->o_tmpalloc( nname->bv_len + 1, op->o_tmpmemctx );
+ memcpy( name->bv_val, dn, name->bv_len );
+ name->bv_val[name->bv_len] = '\0';
+ memcpy( nname->bv_val, ndn, nname->bv_len );
+ nname->bv_val[nname->bv_len] = '\0';
+ }
+ return rc;
+}
+
+/* Find each id in ids that is a child of base and move it to res.
+ */
+int
+mdb_idscope(
+ Operation *op,
+ MDB_txn *txn,
+ ID base,
+ ID *ids,
+ ID *res )
+{
+ struct mdb_info *mdb = (struct mdb_info *) op->o_bd->be_private;
+ MDB_dbi dbi = mdb->mi_dn2id;
+ MDB_val key, data;
+ MDB_cursor *cursor;
+ ID ida, id, cid = 0, ci0 = 0, idc = 0;
+ char *ptr;
+ int rc, copy;
+
+ key.mv_size = sizeof(ID);
+
+ MDB_IDL_ZERO( res );
+
+ rc = mdb_cursor_open( txn, dbi, &cursor );
+ if ( rc ) return rc;
+
+ /* first see if base has any children at all */
+ key.mv_data = &base;
+ rc = mdb_cursor_get( cursor, &key, &data, MDB_SET );
+ if ( rc ) {
+ goto leave;
+ }
+ {
+ size_t dkids;
+ rc = mdb_cursor_count( cursor, &dkids );
+ if ( rc == 0 ) {
+ if ( dkids < 2 ) {
+ goto leave;
+ }
+ }
+ }
+
+ ida = mdb_idl_first( ids, &cid );
+
+ /* Don't bother moving out of ids if it's a range */
+ if (!MDB_IDL_IS_RANGE(ids)) {
+ idc = ids[0];
+ ci0 = cid;
+ }
+
+ while (ida != NOID) {
+ copy = 1;
+ id = ida;
+ while (id) {
+ key.mv_data = &id;
+ rc = mdb_cursor_get( cursor, &key, &data, MDB_SET );
+ if ( rc ) {
+ /* not found, drop this from ids */
+ copy = 0;
+ break;
+ }
+ ptr = data.mv_data;
+ ptr += data.mv_size - sizeof(ID);
+ memcpy( &id, ptr, sizeof(ID) );
+ if ( id == base ) {
+ if ( res[0] >= MDB_idl_db_max ) {
+ /* too many aliases in scope. Fallback to range */
+ MDB_IDL_RANGE( res, MDB_IDL_FIRST( ids ), MDB_IDL_LAST( ids ));
+ goto leave;
+ }
+ res[0]++;
+ res[res[0]] = ida;
+ copy = 0;
+ break;
+ }
+ if ( op->ors_scope == LDAP_SCOPE_ONELEVEL )
+ break;
+ }
+ if (idc) {
+ if (copy) {
+ if (ci0 != cid)
+ ids[ci0] = ids[cid];
+ ci0++;
+ } else
+ idc--;
+ }
+ ida = mdb_idl_next( ids, &cid );
+ }
+ if (!MDB_IDL_IS_RANGE( ids ))
+ ids[0] = idc;
+
+leave:
+ mdb_cursor_close( cursor );
+ return rc;
+}
+
+/* See if base is a child of any of the scopes
+ */
+int
+mdb_idscopes(
+ Operation *op,
+ IdScopes *isc )
+{
+ struct mdb_info *mdb = (struct mdb_info *) op->o_bd->be_private;
+ MDB_dbi dbi = mdb->mi_dn2id;
+ MDB_val key, data;
+ ID id, prev;
+ ID2 id2;
+ char *ptr;
+ int rc = 0;
+ unsigned int x;
+ unsigned int nrlen, rlen;
+ diskNode *d;
+
+ key.mv_size = sizeof(ID);
+
+ if ( !isc->mc ) {
+ rc = mdb_cursor_open( isc->mt, dbi, &isc->mc );
+ if ( rc ) return rc;
+ }
+
+ id = isc->id;
+
+ /* Catch entries from deref'd aliases */
+ x = mdb_id2l_search( isc->scopes, id );
+ if ( x <= isc->scopes[0].mid && isc->scopes[x].mid == id ) {
+ isc->nscope = x;
+ return MDB_SUCCESS;
+ }
+
+ isc->sctmp[0].mid = 0;
+ while (id) {
+ if ( !rc ) {
+ key.mv_data = &id;
+ rc = mdb_cursor_get( isc->mc, &key, &data, MDB_SET );
+ if ( rc )
+ return rc;
+
+ /* save RDN info */
+ }
+ d = data.mv_data;
+ nrlen = (d->nrdnlen[0] << 8) | d->nrdnlen[1];
+ rlen = data.mv_size - sizeof(diskNode) - nrlen;
+ isc->nrdns[isc->numrdns].bv_len = nrlen;
+ isc->nrdns[isc->numrdns].bv_val = d->nrdn;
+ isc->rdns[isc->numrdns].bv_len = rlen;
+ isc->rdns[isc->numrdns].bv_val = d->nrdn+nrlen+1;
+ isc->numrdns++;
+
+ if (!rc && id != isc->id) {
+ /* remember our chain of parents */
+ id2.mid = id;
+ id2.mval = data;
+ mdb_id2l_insert( isc->sctmp, &id2 );
+ }
+ ptr = data.mv_data;
+ ptr += data.mv_size - sizeof(ID);
+ prev = id;
+ memcpy( &id, ptr, sizeof(ID) );
+ /* If we didn't advance, some parent is missing */
+ if ( id == prev )
+ return MDB_NOTFOUND;
+
+ x = mdb_id2l_search( isc->scopes, id );
+ if ( x <= isc->scopes[0].mid && isc->scopes[x].mid == id ) {
+ if ( !isc->scopes[x].mval.mv_data ) {
+ /* This node is in scope, add parent chain to scope */
+ int i;
+ for ( i = 1; i <= isc->sctmp[0].mid; i++ ) {
+ rc = mdb_id2l_insert( isc->scopes, &isc->sctmp[i] );
+ if ( rc )
+ break;
+ }
+ /* check id again since inserts may have changed its position */
+ if ( isc->scopes[x].mid != id )
+ x = mdb_id2l_search( isc->scopes, id );
+ isc->nscope = x;
+ return MDB_SUCCESS;
+ }
+ data = isc->scopes[x].mval;
+ rc = 1;
+ }
+ if ( op->ors_scope == LDAP_SCOPE_ONELEVEL )
+ break;
+ }
+ return MDB_SUCCESS;
+}
+
+/* See if ID is a child of any of the scopes,
+ * return MDB_KEYEXIST if so.
+ */
+int
+mdb_idscopechk(
+ Operation *op,
+ IdScopes *isc )
+{
+ struct mdb_info *mdb = (struct mdb_info *) op->o_bd->be_private;
+ MDB_val key, data;
+ ID id, prev;
+ char *ptr;
+ int rc = 0;
+ unsigned int x;
+
+ key.mv_size = sizeof(ID);
+
+ if ( !isc->mc ) {
+ rc = mdb_cursor_open( isc->mt, mdb->mi_dn2id, &isc->mc );
+ if ( rc ) return rc;
+ }
+
+ id = isc->id;
+
+ while (id) {
+ if ( !rc ) {
+ key.mv_data = &id;
+ rc = mdb_cursor_get( isc->mc, &key, &data, MDB_SET );
+ if ( rc )
+ return rc;
+ }
+
+ ptr = data.mv_data;
+ ptr += data.mv_size - sizeof(ID);
+ prev = id;
+ memcpy( &id, ptr, sizeof(ID) );
+ /* If we didn't advance, some parent is missing */
+ if ( id == prev )
+ return MDB_NOTFOUND;
+
+ x = mdb_id2l_search( isc->scopes, id );
+ if ( x <= isc->scopes[0].mid && isc->scopes[x].mid == id )
+ return MDB_KEYEXIST;
+ }
+ return MDB_SUCCESS;
+}
+
+int
+mdb_dn2id_walk(
+ Operation *op,
+ IdScopes *isc
+)
+{
+ MDB_val key, data;
+ diskNode *d;
+ char *ptr;
+ int rc, n;
+ ID nsubs;
+
+ if ( !isc->numrdns ) {
+ key.mv_data = &isc->id;
+ key.mv_size = sizeof(ID);
+ rc = mdb_cursor_get( isc->mc, &key, &data, MDB_SET );
+ isc->scopes[0].mid = isc->id;
+ isc->numrdns++;
+ isc->nscope = 0;
+ /* skip base if not a subtree walk */
+ if ( isc->oscope == LDAP_SCOPE_SUBTREE ||
+ isc->oscope == LDAP_SCOPE_BASE )
+ return rc;
+ }
+ if ( isc->oscope == LDAP_SCOPE_BASE )
+ return MDB_NOTFOUND;
+
+ for (;;) {
+ /* Get next sibling */
+ rc = mdb_cursor_get( isc->mc, &key, &data, MDB_NEXT_DUP );
+ if ( !rc ) {
+ ptr = (char *)data.mv_data + data.mv_size - 2*sizeof(ID);
+ d = data.mv_data;
+ memcpy( &isc->id, ptr, sizeof(ID));
+
+ /* If we're pushing down, see if there's any children to find */
+ if ( isc->nscope ) {
+ ptr += sizeof(ID);
+ memcpy( &nsubs, ptr, sizeof(ID));
+ /* No children, go to next sibling */
+ if ( nsubs < 2 )
+ continue;
+ }
+ n = isc->numrdns;
+ isc->scopes[n].mid = isc->id;
+ n--;
+ isc->nrdns[n].bv_len = ((d->nrdnlen[0] & 0x7f) << 8) | d->nrdnlen[1];
+ isc->nrdns[n].bv_val = d->nrdn;
+ isc->rdns[n].bv_val = d->nrdn+isc->nrdns[n].bv_len+1;
+ isc->rdns[n].bv_len = data.mv_size - sizeof(diskNode) - isc->nrdns[n].bv_len - sizeof(ID);
+ /* return this ID to caller */
+ if ( !isc->nscope )
+ break;
+
+ /* push down to child */
+ key.mv_data = &isc->id;
+ mdb_cursor_get( isc->mc, &key, &data, MDB_SET );
+ isc->nscope = 0;
+ isc->numrdns++;
+ continue;
+
+ } else if ( rc == MDB_NOTFOUND ) {
+ if ( !isc->nscope && isc->oscope != LDAP_SCOPE_ONELEVEL ) {
+ /* reset to first dup */
+ mdb_cursor_get( isc->mc, &key, NULL, MDB_GET_CURRENT );
+ mdb_cursor_get( isc->mc, &key, &data, MDB_SET );
+ isc->nscope = 1;
+ continue;
+ } else {
+ isc->numrdns--;
+ /* stack is empty? */
+ if ( !isc->numrdns )
+ break;
+ /* pop up to prev node */
+ n = isc->numrdns - 1;
+ key.mv_data = &isc->scopes[n].mid;
+ key.mv_size = sizeof(ID);
+ data.mv_data = isc->nrdns[n].bv_val - 2;
+ data.mv_size = 1; /* just needs to be non-zero, mdb_dup_compare doesn't care */
+ mdb_cursor_get( isc->mc, &key, &data, MDB_GET_BOTH );
+ continue;
+ }
+ } else {
+ break;
+ }
+ }
+ return rc;
+}
+
+/* restore the nrdn/rdn pointers after a txn reset */
+void mdb_dn2id_wrestore (
+ Operation *op,
+ IdScopes *isc
+)
+{
+ MDB_val key, data;
+ diskNode *d;
+ int rc, n, nrlen;
+ char *ptr;
+
+ /* We only need to restore up to the n-1th element,
+ * the nth element will be replaced anyway
+ */
+ key.mv_size = sizeof(ID);
+ for ( n=0; n<isc->numrdns-1; n++ ) {
+ key.mv_data = &isc->scopes[n+1].mid;
+ rc = mdb_cursor_get( isc->mc, &key, &data, MDB_SET );
+ if ( rc )
+ continue;
+ /* we can't use this data directly since its nrlen
+ * is missing the high bit setting, so copy it and
+ * set it properly. we just copy enough to satisfy
+ * mdb_dup_compare.
+ */
+ d = data.mv_data;
+ nrlen = ((d->nrdnlen[0] & 0x7f) << 8) | d->nrdnlen[1];
+ ptr = op->o_tmpalloc( nrlen+2, op->o_tmpmemctx );
+ memcpy( ptr, data.mv_data, nrlen+2 );
+ key.mv_data = &isc->scopes[n].mid;
+ data.mv_data = ptr;
+ data.mv_size = 1;
+ *ptr |= 0x80;
+ mdb_cursor_get( isc->mc, &key, &data, MDB_GET_BOTH );
+ op->o_tmpfree( ptr, op->o_tmpmemctx );
+
+ /* now we're back to where we wanted to be */
+ d = data.mv_data;
+ isc->nrdns[n].bv_val = d->nrdn;
+ isc->rdns[n].bv_val = d->nrdn+isc->nrdns[n].bv_len+1;
+ }
+}