openldap/servers/slapd/back-mdb/dn2id.c
2013-01-02 10:22:57 -08:00

654 lines
15 KiB
C

/* dn2id.c - routines to deal with the dn2id index */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 2000-2013 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 accomodate
* RDNs up to length 32767, but that's fine since full DNs are already
* restricted to 8192.
*
* 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 */
} 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] << 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,
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 : "", 0 );
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, 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 ));
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;
rc = mdb_cursor_put( mcp, &key, &data, MDB_NODUPDATA );
if (rc == 0) {
int flag = MDB_NODUPDATA;
nid = e->e_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 );
}
fail:
op->o_tmpfree( d, op->o_tmpmemctx );
Debug( LDAP_DEBUG_TRACE, "<= mdb_dn2id_add 0x%lx: %d\n", e->e_id, rc, 0 );
return rc;
}
/* mc must have been set by mdb_dn2id */
int
mdb_dn2id_delete(
Operation *op,
MDB_cursor *mc,
ID id )
{
int rc;
Debug( LDAP_DEBUG_TRACE, "=> mdb_dn2id_delete 0x%lx\n",
id, 0, 0 );
/* 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;
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 );
}
Debug( LDAP_DEBUG_TRACE, "<= mdb_dn2id_delete 0x%lx: %d\n", id, rc, 0 );
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.
*/
int
mdb_dn2id(
Operation *op,
MDB_txn *txn,
MDB_cursor *mc,
struct berval *in,
ID *id,
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 : "", 0, 0 );
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 ) return rc;
}
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 - 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;
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;
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, 0 );
} else {
Debug( LDAP_DEBUG_TRACE, "<= mdb_dn2id: got id=0x%lx\n",
nid, 0, 0 );
}
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, 0, 0 );
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 ) return rc;
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 ) {
mdb_cursor_close( cursor );
break;
}
ptr = (char *) data.mv_data + data.mv_size - 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;
}
}
done:
if( rc != 0 ) {
Debug( LDAP_DEBUG_TRACE, "<= mdb_dn2sups: get failed: %s (%d)\n",
mdb_strerror( rc ), rc, 0 );
}
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, ci0, idc = 0;
char *ptr;
int rc;
key.mv_size = sizeof(ID);
MDB_IDL_ZERO( res );
rc = mdb_cursor_open( txn, dbi, &cursor );
if ( rc ) return rc;
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) {
id = ida;
while (id) {
key.mv_data = &id;
rc = mdb_cursor_get( cursor, &key, &data, MDB_SET );
if ( rc ) {
/* not found, move on to next */
if (idc) {
if (ci0 != cid)
ids[ci0] = ids[cid];
ci0++;
}
break;
}
ptr = data.mv_data;
ptr += data.mv_size - sizeof(ID);
memcpy( &id, ptr, sizeof(ID) );
if ( id == base ) {
res[0]++;
res[res[0]] = ida;
if (idc)
idc--;
break;
} else {
if (idc) {
if (ci0 != cid)
ids[ci0] = ids[cid];
ci0++;
}
}
if ( op->ors_scope == LDAP_SCOPE_ONELEVEL )
break;
}
ida = mdb_idl_next( ids, &cid );
}
if (!MDB_IDL_IS_RANGE( ids ))
ids[0] = idc;
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;
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;
while (id) {
if ( !rc ) {
key.mv_data = &id;
rc = mdb_cursor_get( isc->mc, &key, &data, MDB_SET );
if ( rc )
break;
/* 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) {
id2.mid = id;
id2.mval = data;
mdb_id2l_insert( isc->scopes, &id2 );
}
ptr = data.mv_data;
ptr += data.mv_size - sizeof(ID);
memcpy( &id, ptr, sizeof(ID) );
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 ) {
isc->nscope = x;
return MDB_SUCCESS;
}
data = isc->scopes[x].mval;
rc = 1;
}
if ( op->ors_scope == LDAP_SCOPE_ONELEVEL )
break;
}
return MDB_NOTFOUND;
}