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openldap/servers/slapd/back-bdb/search.c
Kurt Zeilenga 2bbf9804b9 Happy New Year!
2012-01-01 07:10:53 -08:00

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/* search.c - search operation */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 2000-2012 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-bdb.h"
#include "idl.h"
static int base_candidate(
BackendDB *be,
Entry *e,
ID *ids );
static int search_candidates(
Operation *op,
SlapReply *rs,
Entry *e,
DB_TXN *txn,
ID *ids,
ID *scopes );
static int parse_paged_cookie( Operation *op, SlapReply *rs );
static void send_paged_response(
Operation *op,
SlapReply *rs,
ID *lastid,
int tentries );
/* Dereference aliases for a single alias entry. Return the final
* dereferenced entry on success, NULL on any failure.
*/
static Entry * deref_base (
Operation *op,
SlapReply *rs,
Entry *e,
Entry **matched,
DB_TXN *txn,
DB_LOCK *lock,
ID *tmp,
ID *visited )
{
struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
struct berval ndn;
EntryInfo *ei;
DB_LOCK lockr;
rs->sr_err = LDAP_ALIAS_DEREF_PROBLEM;
rs->sr_text = "maximum deref depth exceeded";
for (;;) {
/* Remember the last entry we looked at, so we can
* report broken links
*/
*matched = e;
if (BDB_IDL_N(tmp) >= op->o_bd->be_max_deref_depth) {
e = NULL;
break;
}
/* If this is part of a subtree or onelevel search,
* have we seen this ID before? If so, quit.
*/
if ( visited && bdb_idl_insert( visited, e->e_id ) ) {
e = NULL;
break;
}
/* If we've seen this ID during this deref iteration,
* we've hit a loop.
*/
if ( bdb_idl_insert( tmp, e->e_id ) ) {
rs->sr_err = LDAP_ALIAS_PROBLEM;
rs->sr_text = "circular alias";
e = NULL;
break;
}
/* If there was a problem getting the aliasedObjectName,
* get_alias_dn will have set the error status.
*/
if ( get_alias_dn(e, &ndn, &rs->sr_err, &rs->sr_text) ) {
e = NULL;
break;
}
rs->sr_err = bdb_dn2entry( op, txn, &ndn, &ei,
0, &lockr );
if ( rs->sr_err == DB_LOCK_DEADLOCK )
return NULL;
if ( ei ) {
e = ei->bei_e;
} else {
e = NULL;
}
if (!e) {
rs->sr_err = LDAP_ALIAS_PROBLEM;
rs->sr_text = "aliasedObject not found";
break;
}
/* Free the previous entry, continue to work with the
* one we just retrieved.
*/
bdb_cache_return_entry_r( bdb, *matched, lock);
*lock = lockr;
/* We found a regular entry. Return this to the caller. The
* entry is still locked for Read.
*/
if (!is_entry_alias(e)) {
rs->sr_err = LDAP_SUCCESS;
rs->sr_text = NULL;
break;
}
}
return e;
}
/* Look for and dereference all aliases within the search scope. Adds
* the dereferenced entries to the "ids" list. Requires "stack" to be
* able to hold 8 levels of DB_SIZE IDLs. Of course we're hardcoded to
* require a minimum of 8 UM_SIZE IDLs so this is never a problem.
*/
static int search_aliases(
Operation *op,
SlapReply *rs,
Entry *e,
DB_TXN *txn,
ID *ids,
ID *scopes,
ID *stack )
{
struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
ID *aliases, *curscop, *subscop, *visited, *newsubs, *oldsubs, *tmp;
ID cursora, ida, cursoro, ido, *subscop2;
Entry *matched, *a;
EntryInfo *ei;
struct berval bv_alias = BER_BVC( "alias" );
AttributeAssertion aa_alias = ATTRIBUTEASSERTION_INIT;
Filter af;
DB_LOCK locka, lockr;
int first = 1;
aliases = stack; /* IDL of all aliases in the database */
curscop = aliases + BDB_IDL_DB_SIZE; /* Aliases in the current scope */
subscop = curscop + BDB_IDL_DB_SIZE; /* The current scope */
visited = subscop + BDB_IDL_DB_SIZE; /* IDs we've seen in this search */
newsubs = visited + BDB_IDL_DB_SIZE; /* New subtrees we've added */
oldsubs = newsubs + BDB_IDL_DB_SIZE; /* Subtrees added previously */
tmp = oldsubs + BDB_IDL_DB_SIZE; /* Scratch space for deref_base() */
/* A copy of subscop, because subscop gets clobbered by
* the bdb_idl_union/intersection routines
*/
subscop2 = tmp + BDB_IDL_DB_SIZE;
af.f_choice = LDAP_FILTER_EQUALITY;
af.f_ava = &aa_alias;
af.f_av_desc = slap_schema.si_ad_objectClass;
af.f_av_value = bv_alias;
af.f_next = NULL;
/* Find all aliases in database */
BDB_IDL_ZERO( aliases );
rs->sr_err = bdb_filter_candidates( op, txn, &af, aliases,
curscop, visited );
if (rs->sr_err != LDAP_SUCCESS) {
return rs->sr_err;
}
oldsubs[0] = 1;
oldsubs[1] = e->e_id;
BDB_IDL_ZERO( ids );
BDB_IDL_ZERO( visited );
BDB_IDL_ZERO( newsubs );
cursoro = 0;
ido = bdb_idl_first( oldsubs, &cursoro );
for (;;) {
/* Set curscop to only the aliases in the current scope. Start with
* all the aliases, obtain the IDL for the current scope, and then
* get the intersection of these two IDLs. Add the current scope
* to the cumulative list of candidates.
*/
BDB_IDL_CPY( curscop, aliases );
rs->sr_err = bdb_dn2idl( op, txn, &e->e_nname, BEI(e), subscop,
subscop2+BDB_IDL_DB_SIZE );
if (first) {
first = 0;
} else {
bdb_cache_return_entry_r (bdb, e, &locka);
}
if ( rs->sr_err == DB_LOCK_DEADLOCK )
return rs->sr_err;
BDB_IDL_CPY(subscop2, subscop);
rs->sr_err = bdb_idl_intersection(curscop, subscop);
bdb_idl_union( ids, subscop2 );
/* Dereference all of the aliases in the current scope. */
cursora = 0;
for (ida = bdb_idl_first(curscop, &cursora); ida != NOID;
ida = bdb_idl_next(curscop, &cursora))
{
ei = NULL;
retry1:
rs->sr_err = bdb_cache_find_id(op, txn,
ida, &ei, 0, &lockr );
if (rs->sr_err != LDAP_SUCCESS) {
if ( rs->sr_err == DB_LOCK_DEADLOCK )
return rs->sr_err;
if ( rs->sr_err == DB_LOCK_NOTGRANTED )
goto retry1;
continue;
}
a = ei->bei_e;
/* This should only happen if the curscop IDL has maxed out and
* turned into a range that spans IDs indiscriminately
*/
if (!is_entry_alias(a)) {
bdb_cache_return_entry_r (bdb, a, &lockr);
continue;
}
/* Actually dereference the alias */
BDB_IDL_ZERO(tmp);
a = deref_base( op, rs, a, &matched, txn, &lockr,
tmp, visited );
if (a) {
/* If the target was not already in our current candidates,
* make note of it in the newsubs list. Also
* set it in the scopes list so that bdb_search
* can check it.
*/
if (bdb_idl_insert(ids, a->e_id) == 0) {
bdb_idl_insert(newsubs, a->e_id);
bdb_idl_insert(scopes, a->e_id);
}
bdb_cache_return_entry_r( bdb, a, &lockr);
} else if ( rs->sr_err == DB_LOCK_DEADLOCK ) {
return rs->sr_err;
} else if (matched) {
/* Alias could not be dereferenced, or it deref'd to
* an ID we've already seen. Ignore it.
*/
bdb_cache_return_entry_r( bdb, matched, &lockr );
rs->sr_text = NULL;
}
}
/* If this is a OneLevel search, we're done; oldsubs only had one
* ID in it. For a Subtree search, oldsubs may be a list of scope IDs.
*/
if ( op->ors_scope == LDAP_SCOPE_ONELEVEL ) break;
nextido:
ido = bdb_idl_next( oldsubs, &cursoro );
/* If we're done processing the old scopes, did we add any new
* scopes in this iteration? If so, go back and do those now.
*/
if (ido == NOID) {
if (BDB_IDL_IS_ZERO(newsubs)) break;
BDB_IDL_CPY(oldsubs, newsubs);
BDB_IDL_ZERO(newsubs);
cursoro = 0;
ido = bdb_idl_first( oldsubs, &cursoro );
}
/* Find the entry corresponding to the next scope. If it can't
* be found, ignore it and move on. This should never happen;
* we should never see the ID of an entry that doesn't exist.
* Set the name so that the scope's IDL can be retrieved.
*/
ei = NULL;
sameido:
rs->sr_err = bdb_cache_find_id(op, txn, ido, &ei,
0, &locka );
if ( rs->sr_err != LDAP_SUCCESS ) {
if ( rs->sr_err == DB_LOCK_DEADLOCK )
return rs->sr_err;
if ( rs->sr_err == DB_LOCK_NOTGRANTED )
goto sameido;
goto nextido;
}
e = ei->bei_e;
}
return rs->sr_err;
}
/* Get the next ID from the DB. Used if the candidate list is
* a range and simple iteration hits missing entryIDs
*/
static int
bdb_get_nextid(struct bdb_info *bdb, DB_TXN *ltid, ID *cursor)
{
DBC *curs;
DBT key, data;
ID id, nid;
int rc;
id = *cursor + 1;
BDB_ID2DISK( id, &nid );
rc = bdb->bi_id2entry->bdi_db->cursor(
bdb->bi_id2entry->bdi_db, ltid, &curs, bdb->bi_db_opflags );
if ( rc )
return rc;
key.data = &nid;
key.size = key.ulen = sizeof(ID);
key.flags = DB_DBT_USERMEM;
data.flags = DB_DBT_USERMEM | DB_DBT_PARTIAL;
data.dlen = data.ulen = 0;
rc = curs->c_get( curs, &key, &data, DB_SET_RANGE );
curs->c_close( curs );
if ( rc )
return rc;
BDB_DISK2ID( &nid, cursor );
return 0;
}
int
bdb_search( Operation *op, SlapReply *rs )
{
struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
ID id, cursor;
ID lastid = NOID;
ID candidates[BDB_IDL_UM_SIZE];
ID scopes[BDB_IDL_DB_SIZE];
Entry *e = NULL, base, *e_root;
Entry *matched = NULL;
EntryInfo *ei;
AttributeName *attrs;
struct berval realbase = BER_BVNULL;
slap_mask_t mask;
time_t stoptime;
int manageDSAit;
int tentries = 0;
unsigned nentries = 0;
int idflag = 0;
DB_LOCK lock;
struct bdb_op_info *opinfo = NULL;
DB_TXN *ltid = NULL;
OpExtra *oex;
Debug( LDAP_DEBUG_TRACE, "=> " LDAP_XSTRING(bdb_search) "\n", 0, 0, 0);
attrs = op->oq_search.rs_attrs;
LDAP_SLIST_FOREACH( oex, &op->o_extra, oe_next ) {
if ( oex->oe_key == bdb )
break;
}
opinfo = (struct bdb_op_info *) oex;
manageDSAit = get_manageDSAit( op );
if ( opinfo && opinfo->boi_txn ) {
ltid = opinfo->boi_txn;
} else {
rs->sr_err = bdb_reader_get( op, bdb->bi_dbenv, &ltid );
switch(rs->sr_err) {
case 0:
break;
default:
send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
return rs->sr_err;
}
}
e_root = bdb->bi_cache.c_dntree.bei_e;
if ( op->o_req_ndn.bv_len == 0 ) {
/* DIT root special case */
ei = e_root->e_private;
rs->sr_err = LDAP_SUCCESS;
} else {
if ( op->ors_deref & LDAP_DEREF_FINDING ) {
BDB_IDL_ZERO(candidates);
}
dn2entry_retry:
/* get entry with reader lock */
rs->sr_err = bdb_dn2entry( op, ltid, &op->o_req_ndn, &ei,
1, &lock );
}
switch(rs->sr_err) {
case DB_NOTFOUND:
matched = ei->bei_e;
break;
case 0:
e = ei->bei_e;
break;
case DB_LOCK_DEADLOCK:
if ( !opinfo ) {
ltid->flags &= ~TXN_DEADLOCK;
goto dn2entry_retry;
}
opinfo->boi_err = rs->sr_err;
/* FALLTHRU */
case LDAP_BUSY:
send_ldap_error( op, rs, LDAP_BUSY, "ldap server busy" );
return LDAP_BUSY;
case DB_LOCK_NOTGRANTED:
goto dn2entry_retry;
default:
send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
return rs->sr_err;
}
if ( op->ors_deref & LDAP_DEREF_FINDING ) {
if ( matched && is_entry_alias( matched )) {
struct berval stub;
stub.bv_val = op->o_req_ndn.bv_val;
stub.bv_len = op->o_req_ndn.bv_len - matched->e_nname.bv_len - 1;
e = deref_base( op, rs, matched, &matched, ltid, &lock,
candidates, NULL );
if ( e ) {
build_new_dn( &op->o_req_ndn, &e->e_nname, &stub,
op->o_tmpmemctx );
bdb_cache_return_entry_r (bdb, e, &lock);
matched = NULL;
goto dn2entry_retry;
}
} else if ( e && is_entry_alias( e )) {
e = deref_base( op, rs, e, &matched, ltid, &lock,
candidates, NULL );
}
}
if ( e == NULL ) {
struct berval matched_dn = BER_BVNULL;
if ( matched != NULL ) {
BerVarray erefs = NULL;
/* return referral only if "disclose"
* is granted on the object */
if ( ! access_allowed( op, matched,
slap_schema.si_ad_entry,
NULL, ACL_DISCLOSE, NULL ) )
{
rs->sr_err = LDAP_NO_SUCH_OBJECT;
} else {
ber_dupbv( &matched_dn, &matched->e_name );
erefs = is_entry_referral( matched )
? get_entry_referrals( op, matched )
: NULL;
if ( rs->sr_err == DB_NOTFOUND )
rs->sr_err = LDAP_REFERRAL;
rs->sr_matched = matched_dn.bv_val;
}
#ifdef SLAP_ZONE_ALLOC
slap_zn_runlock(bdb->bi_cache.c_zctx, matched);
#endif
bdb_cache_return_entry_r (bdb, matched, &lock);
matched = NULL;
if ( erefs ) {
rs->sr_ref = referral_rewrite( erefs, &matched_dn,
&op->o_req_dn, op->oq_search.rs_scope );
ber_bvarray_free( erefs );
}
} else {
#ifdef SLAP_ZONE_ALLOC
slap_zn_runlock(bdb->bi_cache.c_zctx, matched);
#endif
rs->sr_ref = referral_rewrite( default_referral,
NULL, &op->o_req_dn, op->oq_search.rs_scope );
rs->sr_err = rs->sr_ref != NULL ? LDAP_REFERRAL : LDAP_NO_SUCH_OBJECT;
}
send_ldap_result( op, rs );
if ( rs->sr_ref ) {
ber_bvarray_free( rs->sr_ref );
rs->sr_ref = NULL;
}
if ( !BER_BVISNULL( &matched_dn ) ) {
ber_memfree( matched_dn.bv_val );
rs->sr_matched = NULL;
}
return rs->sr_err;
}
/* NOTE: __NEW__ "search" access is required
* on searchBase object */
if ( ! access_allowed_mask( op, e, slap_schema.si_ad_entry,
NULL, ACL_SEARCH, NULL, &mask ) )
{
if ( !ACL_GRANT( mask, ACL_DISCLOSE ) ) {
rs->sr_err = LDAP_NO_SUCH_OBJECT;
} else {
rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
}
#ifdef SLAP_ZONE_ALLOC
slap_zn_runlock(bdb->bi_cache.c_zctx, e);
#endif
if ( e != e_root ) {
bdb_cache_return_entry_r(bdb, e, &lock);
}
send_ldap_result( op, rs );
return rs->sr_err;
}
if ( !manageDSAit && e != e_root && is_entry_referral( e ) ) {
/* entry is a referral, don't allow add */
struct berval matched_dn = BER_BVNULL;
BerVarray erefs = NULL;
ber_dupbv( &matched_dn, &e->e_name );
erefs = get_entry_referrals( op, e );
rs->sr_err = LDAP_REFERRAL;
#ifdef SLAP_ZONE_ALLOC
slap_zn_runlock(bdb->bi_cache.c_zctx, e);
#endif
bdb_cache_return_entry_r( bdb, e, &lock );
e = NULL;
if ( erefs ) {
rs->sr_ref = referral_rewrite( erefs, &matched_dn,
&op->o_req_dn, op->oq_search.rs_scope );
ber_bvarray_free( erefs );
if ( !rs->sr_ref ) {
rs->sr_text = "bad_referral object";
}
}
Debug( LDAP_DEBUG_TRACE,
LDAP_XSTRING(bdb_search) ": entry is referral\n",
0, 0, 0 );
rs->sr_matched = matched_dn.bv_val;
send_ldap_result( op, rs );
ber_bvarray_free( rs->sr_ref );
rs->sr_ref = NULL;
ber_memfree( matched_dn.bv_val );
rs->sr_matched = NULL;
return 1;
}
if ( get_assert( op ) &&
( test_filter( op, e, get_assertion( op )) != LDAP_COMPARE_TRUE ))
{
rs->sr_err = LDAP_ASSERTION_FAILED;
#ifdef SLAP_ZONE_ALLOC
slap_zn_runlock(bdb->bi_cache.c_zctx, e);
#endif
if ( e != e_root ) {
bdb_cache_return_entry_r(bdb, e, &lock);
}
send_ldap_result( op, rs );
return 1;
}
/* compute it anyway; root does not use it */
stoptime = op->o_time + op->ors_tlimit;
/* need normalized dn below */
ber_dupbv( &realbase, &e->e_nname );
/* Copy info to base, must free entry before accessing the database
* in search_candidates, to avoid deadlocks.
*/
base.e_private = e->e_private;
base.e_nname = realbase;
base.e_id = e->e_id;
#ifdef SLAP_ZONE_ALLOC
slap_zn_runlock(bdb->bi_cache.c_zctx, e);
#endif
if ( e != e_root ) {
bdb_cache_return_entry_r(bdb, e, &lock);
}
e = NULL;
/* select candidates */
if ( op->oq_search.rs_scope == LDAP_SCOPE_BASE ) {
rs->sr_err = base_candidate( op->o_bd, &base, candidates );
} else {
cand_retry:
BDB_IDL_ZERO( candidates );
BDB_IDL_ZERO( scopes );
rs->sr_err = search_candidates( op, rs, &base,
ltid, candidates, scopes );
if ( rs->sr_err == DB_LOCK_DEADLOCK ) {
if ( !opinfo ) {
ltid->flags &= ~TXN_DEADLOCK;
goto cand_retry;
}
opinfo->boi_err = rs->sr_err;
send_ldap_error( op, rs, LDAP_BUSY, "ldap server busy" );
return LDAP_BUSY;
}
}
/* start cursor at beginning of candidates.
*/
cursor = 0;
if ( candidates[0] == 0 ) {
Debug( LDAP_DEBUG_TRACE,
LDAP_XSTRING(bdb_search) ": no candidates\n",
0, 0, 0 );
goto nochange;
}
/* if not root and candidates exceed to-be-checked entries, abort */
if ( op->ors_limit /* isroot == FALSE */ &&
op->ors_limit->lms_s_unchecked != -1 &&
BDB_IDL_N(candidates) > (unsigned) op->ors_limit->lms_s_unchecked )
{
rs->sr_err = LDAP_ADMINLIMIT_EXCEEDED;
send_ldap_result( op, rs );
rs->sr_err = LDAP_SUCCESS;
goto done;
}
if ( op->ors_limit == NULL /* isroot == TRUE */ ||
!op->ors_limit->lms_s_pr_hide )
{
tentries = BDB_IDL_N(candidates);
}
if ( get_pagedresults( op ) > SLAP_CONTROL_IGNORED ) {
PagedResultsState *ps = op->o_pagedresults_state;
/* deferred cookie parsing */
rs->sr_err = parse_paged_cookie( op, rs );
if ( rs->sr_err != LDAP_SUCCESS ) {
send_ldap_result( op, rs );
goto done;
}
cursor = (ID) ps->ps_cookie;
if ( cursor && ps->ps_size == 0 ) {
rs->sr_err = LDAP_SUCCESS;
rs->sr_text = "search abandoned by pagedResult size=0";
send_ldap_result( op, rs );
goto done;
}
id = bdb_idl_first( candidates, &cursor );
if ( id == NOID ) {
Debug( LDAP_DEBUG_TRACE,
LDAP_XSTRING(bdb_search)
": no paged results candidates\n",
0, 0, 0 );
send_paged_response( op, rs, &lastid, 0 );
rs->sr_err = LDAP_OTHER;
goto done;
}
nentries = ps->ps_count;
if ( id == (ID)ps->ps_cookie )
id = bdb_idl_next( candidates, &cursor );
goto loop_begin;
}
for ( id = bdb_idl_first( candidates, &cursor );
id != NOID ; id = bdb_idl_next( candidates, &cursor ) )
{
int scopeok;
loop_begin:
/* check for abandon */
if ( op->o_abandon ) {
rs->sr_err = SLAPD_ABANDON;
send_ldap_result( op, rs );
goto done;
}
/* mostly needed by internal searches,
* e.g. related to syncrepl, for whom
* abandon does not get set... */
if ( slapd_shutdown ) {
rs->sr_err = LDAP_UNAVAILABLE;
send_ldap_disconnect( op, rs );
goto done;
}
/* check time limit */
if ( op->ors_tlimit != SLAP_NO_LIMIT
&& slap_get_time() > stoptime )
{
rs->sr_err = LDAP_TIMELIMIT_EXCEEDED;
rs->sr_ref = rs->sr_v2ref;
send_ldap_result( op, rs );
rs->sr_err = LDAP_SUCCESS;
goto done;
}
/* If we inspect more entries than will
* fit into the entry cache, stop caching
* any subsequent entries
*/
nentries++;
if ( nentries > bdb->bi_cache.c_maxsize && !idflag ) {
idflag = ID_NOCACHE;
}
fetch_entry_retry:
/* get the entry with reader lock */
ei = NULL;
rs->sr_err = bdb_cache_find_id( op, ltid,
id, &ei, idflag, &lock );
if (rs->sr_err == LDAP_BUSY) {
rs->sr_text = "ldap server busy";
send_ldap_result( op, rs );
goto done;
} else if ( rs->sr_err == DB_LOCK_DEADLOCK ) {
if ( !opinfo ) {
ltid->flags &= ~TXN_DEADLOCK;
goto fetch_entry_retry;
}
txnfail:
opinfo->boi_err = rs->sr_err;
send_ldap_error( op, rs, LDAP_BUSY, "ldap server busy" );
goto done;
} else if ( rs->sr_err == DB_LOCK_NOTGRANTED )
{
goto fetch_entry_retry;
} else if ( rs->sr_err == LDAP_OTHER ) {
rs->sr_text = "internal error";
send_ldap_result( op, rs );
goto done;
}
if ( ei && rs->sr_err == LDAP_SUCCESS ) {
e = ei->bei_e;
} else {
e = NULL;
}
if ( e == NULL ) {
if( !BDB_IDL_IS_RANGE(candidates) ) {
/* only complain for non-range IDLs */
Debug( LDAP_DEBUG_TRACE,
LDAP_XSTRING(bdb_search)
": candidate %ld not found\n",
(long) id, 0, 0 );
} else {
/* get the next ID from the DB */
id_retry:
rs->sr_err = bdb_get_nextid( bdb, ltid, &cursor );
if ( rs->sr_err == DB_NOTFOUND ) {
break;
} else if ( rs->sr_err == DB_LOCK_DEADLOCK ) {
if ( opinfo )
goto txnfail;
ltid->flags &= ~TXN_DEADLOCK;
goto id_retry;
} else if ( rs->sr_err == DB_LOCK_NOTGRANTED ) {
goto id_retry;
}
if ( rs->sr_err ) {
rs->sr_err = LDAP_OTHER;
rs->sr_text = "internal error in get_nextid";
send_ldap_result( op, rs );
goto done;
}
cursor--;
}
goto loop_continue;
}
if ( is_entry_subentry( e ) ) {
if( op->oq_search.rs_scope != LDAP_SCOPE_BASE ) {
if(!get_subentries_visibility( op )) {
/* only subentries are visible */
goto loop_continue;
}
} else if ( get_subentries( op ) &&
!get_subentries_visibility( op ))
{
/* only subentries are visible */
goto loop_continue;
}
} else if ( get_subentries_visibility( op )) {
/* only subentries are visible */
goto loop_continue;
}
/* Does this candidate actually satisfy the search scope?
*
* Note that we don't lock access to the bei_parent pointer.
* Since only leaf nodes can be deleted, the parent of any
* node will always be a valid node. Also since we have
* a Read lock on the data, it cannot be renamed out of the
* scope while we are looking at it, and unless we're using
* BDB_HIER, its parents cannot be moved either.
*/
scopeok = 0;
switch( op->ors_scope ) {
case LDAP_SCOPE_BASE:
/* This is always true, yes? */
if ( id == base.e_id ) scopeok = 1;
break;
case LDAP_SCOPE_ONELEVEL:
if ( ei->bei_parent->bei_id == base.e_id ) scopeok = 1;
break;
#ifdef LDAP_SCOPE_CHILDREN
case LDAP_SCOPE_CHILDREN:
if ( id == base.e_id ) break;
/* Fall-thru */
#endif
case LDAP_SCOPE_SUBTREE: {
EntryInfo *tmp;
for ( tmp = BEI(e); tmp; tmp = tmp->bei_parent ) {
if ( tmp->bei_id == base.e_id ) {
scopeok = 1;
break;
}
}
} break;
}
/* aliases were already dereferenced in candidate list */
if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
/* but if the search base is an alias, and we didn't
* deref it when finding, return it.
*/
if ( is_entry_alias(e) &&
((op->ors_deref & LDAP_DEREF_FINDING) ||
!bvmatch(&e->e_nname, &op->o_req_ndn)))
{
goto loop_continue;
}
/* scopes is only non-empty for onelevel or subtree */
if ( !scopeok && BDB_IDL_N(scopes) ) {
unsigned x;
if ( op->ors_scope == LDAP_SCOPE_ONELEVEL ) {
x = bdb_idl_search( scopes, e->e_id );
if ( scopes[x] == e->e_id ) scopeok = 1;
} else {
/* subtree, walk up the tree */
EntryInfo *tmp = BEI(e);
for (;tmp->bei_parent; tmp=tmp->bei_parent) {
x = bdb_idl_search( scopes, tmp->bei_id );
if ( scopes[x] == tmp->bei_id ) {
scopeok = 1;
break;
}
}
}
}
}
/* Not in scope, ignore it */
if ( !scopeok )
{
Debug( LDAP_DEBUG_TRACE,
LDAP_XSTRING(bdb_search)
": %ld scope not okay\n",
(long) id, 0, 0 );
goto loop_continue;
}
/*
* 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 ( !manageDSAit && op->oq_search.rs_scope != LDAP_SCOPE_BASE
&& is_entry_referral( e ) )
{
struct bdb_op_info bois;
struct bdb_lock_info blis;
BerVarray erefs = get_entry_referrals( op, e );
rs->sr_ref = referral_rewrite( erefs, &e->e_name, NULL,
op->oq_search.rs_scope == LDAP_SCOPE_ONELEVEL
? LDAP_SCOPE_BASE : LDAP_SCOPE_SUBTREE );
/* Must set lockinfo so that entry_release will work */
if (!opinfo) {
bois.boi_oe.oe_key = bdb;
bois.boi_txn = NULL;
bois.boi_err = 0;
bois.boi_acl_cache = op->o_do_not_cache;
bois.boi_flag = BOI_DONTFREE;
bois.boi_locks = &blis;
blis.bli_next = NULL;
LDAP_SLIST_INSERT_HEAD( &op->o_extra, &bois.boi_oe,
oe_next );
} else {
blis.bli_next = opinfo->boi_locks;
opinfo->boi_locks = &blis;
}
blis.bli_id = e->e_id;
blis.bli_lock = lock;
blis.bli_flag = BLI_DONTFREE;
rs->sr_entry = e;
rs->sr_flags = REP_ENTRY_MUSTRELEASE;
send_search_reference( op, rs );
if ( blis.bli_flag ) {
#ifdef SLAP_ZONE_ALLOC
slap_zn_runlock(bdb->bi_cache.c_zctx, e);
#endif
bdb_cache_return_entry_r(bdb, e, &lock);
if ( opinfo ) {
opinfo->boi_locks = blis.bli_next;
} else {
LDAP_SLIST_REMOVE( &op->o_extra, &bois.boi_oe,
OpExtra, oe_next );
}
}
rs->sr_entry = NULL;
e = NULL;
ber_bvarray_free( rs->sr_ref );
ber_bvarray_free( erefs );
rs->sr_ref = NULL;
goto loop_continue;
}
if ( !manageDSAit && is_entry_glue( e )) {
goto loop_continue;
}
/* if it matches the filter and scope, send it */
rs->sr_err = test_filter( op, e, op->oq_search.rs_filter );
if ( rs->sr_err == LDAP_COMPARE_TRUE ) {
/* check size limit */
if ( get_pagedresults(op) > SLAP_CONTROL_IGNORED ) {
if ( rs->sr_nentries >= ((PagedResultsState *)op->o_pagedresults_state)->ps_size ) {
#ifdef SLAP_ZONE_ALLOC
slap_zn_runlock(bdb->bi_cache.c_zctx, e);
#endif
bdb_cache_return_entry_r( bdb, e, &lock );
e = NULL;
send_paged_response( op, rs, &lastid, tentries );
goto done;
}
lastid = id;
}
if (e) {
struct bdb_op_info bois;
struct bdb_lock_info blis;
/* Must set lockinfo so that entry_release will work */
if (!opinfo) {
bois.boi_oe.oe_key = bdb;
bois.boi_txn = NULL;
bois.boi_err = 0;
bois.boi_acl_cache = op->o_do_not_cache;
bois.boi_flag = BOI_DONTFREE;
bois.boi_locks = &blis;
blis.bli_next = NULL;
LDAP_SLIST_INSERT_HEAD( &op->o_extra, &bois.boi_oe,
oe_next );
} else {
blis.bli_next = opinfo->boi_locks;
opinfo->boi_locks = &blis;
}
blis.bli_id = e->e_id;
blis.bli_lock = lock;
blis.bli_flag = BLI_DONTFREE;
/* safe default */
rs->sr_attrs = op->oq_search.rs_attrs;
rs->sr_operational_attrs = NULL;
rs->sr_ctrls = NULL;
rs->sr_entry = e;
RS_ASSERT( e->e_private != NULL );
rs->sr_flags = REP_ENTRY_MUSTRELEASE;
rs->sr_err = LDAP_SUCCESS;
rs->sr_err = send_search_entry( op, rs );
rs->sr_attrs = NULL;
rs->sr_entry = NULL;
/* send_search_entry will usually free it.
* an overlay might leave its own copy here;
* bli_flag will be 0 if lock was already released.
*/
if ( blis.bli_flag ) {
#ifdef SLAP_ZONE_ALLOC
slap_zn_runlock(bdb->bi_cache.c_zctx, e);
#endif
bdb_cache_return_entry_r(bdb, e, &lock);
if ( opinfo ) {
opinfo->boi_locks = blis.bli_next;
} else {
LDAP_SLIST_REMOVE( &op->o_extra, &bois.boi_oe,
OpExtra, oe_next );
}
}
e = NULL;
switch ( rs->sr_err ) {
case LDAP_SUCCESS: /* entry sent ok */
break;
default: /* entry not sent */
break;
case LDAP_UNAVAILABLE:
case LDAP_SIZELIMIT_EXCEEDED:
if ( rs->sr_err == LDAP_SIZELIMIT_EXCEEDED ) {
rs->sr_ref = rs->sr_v2ref;
send_ldap_result( op, rs );
rs->sr_err = LDAP_SUCCESS;
} else {
rs->sr_err = LDAP_OTHER;
}
goto done;
}
}
} else {
Debug( LDAP_DEBUG_TRACE,
LDAP_XSTRING(bdb_search)
": %ld does not match filter\n",
(long) id, 0, 0 );
}
loop_continue:
if( e != NULL ) {
/* free reader lock */
#ifdef SLAP_ZONE_ALLOC
slap_zn_runlock(bdb->bi_cache.c_zctx, e);
#endif
bdb_cache_return_entry_r( bdb, e , &lock );
RS_ASSERT( rs->sr_entry == NULL );
e = NULL;
rs->sr_entry = NULL;
}
}
nochange:
rs->sr_ctrls = NULL;
rs->sr_ref = rs->sr_v2ref;
rs->sr_err = (rs->sr_v2ref == NULL) ? LDAP_SUCCESS : LDAP_REFERRAL;
rs->sr_rspoid = NULL;
if ( get_pagedresults(op) > SLAP_CONTROL_IGNORED ) {
send_paged_response( op, rs, NULL, 0 );
} else {
send_ldap_result( op, rs );
}
rs->sr_err = LDAP_SUCCESS;
done:
if( rs->sr_v2ref ) {
ber_bvarray_free( rs->sr_v2ref );
rs->sr_v2ref = NULL;
}
if( realbase.bv_val ) ch_free( realbase.bv_val );
return rs->sr_err;
}
static int base_candidate(
BackendDB *be,
Entry *e,
ID *ids )
{
Debug(LDAP_DEBUG_ARGS, "base_candidates: base: \"%s\" (0x%08lx)\n",
e->e_nname.bv_val, (long) e->e_id, 0);
ids[0] = 1;
ids[1] = e->e_id;
return 0;
}
/* Look for "objectClass Present" in this filter.
* Also count depth of filter tree while we're at it.
*/
static int oc_filter(
Filter *f,
int cur,
int *max )
{
int rc = 0;
assert( f != NULL );
if( cur > *max ) *max = cur;
switch( f->f_choice ) {
case LDAP_FILTER_PRESENT:
if (f->f_desc == slap_schema.si_ad_objectClass) {
rc = 1;
}
break;
case LDAP_FILTER_AND:
case LDAP_FILTER_OR:
cur++;
for ( f=f->f_and; f; f=f->f_next ) {
(void) oc_filter(f, cur, max);
}
break;
default:
break;
}
return rc;
}
static void search_stack_free( void *key, void *data )
{
ber_memfree_x(data, NULL);
}
static void *search_stack( Operation *op )
{
struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
void *ret = NULL;
if ( op->o_threadctx ) {
ldap_pvt_thread_pool_getkey( op->o_threadctx, (void *)search_stack,
&ret, NULL );
} else {
ret = bdb->bi_search_stack;
}
if ( !ret ) {
ret = ch_malloc( bdb->bi_search_stack_depth * BDB_IDL_UM_SIZE
* sizeof( ID ) );
if ( op->o_threadctx ) {
ldap_pvt_thread_pool_setkey( op->o_threadctx, (void *)search_stack,
ret, search_stack_free, NULL, NULL );
} else {
bdb->bi_search_stack = ret;
}
}
return ret;
}
static int search_candidates(
Operation *op,
SlapReply *rs,
Entry *e,
DB_TXN *txn,
ID *ids,
ID *scopes )
{
struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
int rc, depth = 1;
Filter f, rf, xf, nf;
ID *stack;
AttributeAssertion aa_ref = ATTRIBUTEASSERTION_INIT;
Filter sf;
AttributeAssertion aa_subentry = ATTRIBUTEASSERTION_INIT;
/*
* This routine takes as input a filter (user-filter)
* and rewrites it as follows:
* (&(scope=DN)[(objectClass=subentry)]
* (|[(objectClass=referral)(objectClass=alias)](user-filter))
*/
Debug(LDAP_DEBUG_TRACE,
"search_candidates: base=\"%s\" (0x%08lx) scope=%d\n",
e->e_nname.bv_val, (long) e->e_id, op->oq_search.rs_scope );
xf.f_or = op->oq_search.rs_filter;
xf.f_choice = LDAP_FILTER_OR;
xf.f_next = NULL;
/* If the user's filter uses objectClass=*,
* these clauses are redundant.
*/
if (!oc_filter(op->oq_search.rs_filter, 1, &depth)
&& !get_subentries_visibility(op)) {
if( !get_manageDSAit(op) && !get_domainScope(op) ) {
/* match referral objects */
struct berval bv_ref = BER_BVC( "referral" );
rf.f_choice = LDAP_FILTER_EQUALITY;
rf.f_ava = &aa_ref;
rf.f_av_desc = slap_schema.si_ad_objectClass;
rf.f_av_value = bv_ref;
rf.f_next = xf.f_or;
xf.f_or = &rf;
depth++;
}
}
f.f_next = NULL;
f.f_choice = LDAP_FILTER_AND;
f.f_and = &nf;
/* Dummy; we compute scope separately now */
nf.f_choice = SLAPD_FILTER_COMPUTED;
nf.f_result = LDAP_SUCCESS;
nf.f_next = ( xf.f_or == op->oq_search.rs_filter )
? op->oq_search.rs_filter : &xf ;
/* Filter depth increased again, adding dummy clause */
depth++;
if( get_subentries_visibility( op ) ) {
struct berval bv_subentry = BER_BVC( "subentry" );
sf.f_choice = LDAP_FILTER_EQUALITY;
sf.f_ava = &aa_subentry;
sf.f_av_desc = slap_schema.si_ad_objectClass;
sf.f_av_value = bv_subentry;
sf.f_next = nf.f_next;
nf.f_next = &sf;
}
/* Allocate IDL stack, plus 1 more for former tmp */
if ( depth+1 > bdb->bi_search_stack_depth ) {
stack = ch_malloc( (depth + 1) * BDB_IDL_UM_SIZE * sizeof( ID ) );
} else {
stack = search_stack( op );
}
if( op->ors_deref & LDAP_DEREF_SEARCHING ) {
rc = search_aliases( op, rs, e, txn, ids, scopes, stack );
} else {
rc = bdb_dn2idl( op, txn, &e->e_nname, BEI(e), ids, stack );
}
if ( rc == LDAP_SUCCESS ) {
rc = bdb_filter_candidates( op, txn, &f, ids,
stack, stack+BDB_IDL_UM_SIZE );
}
if ( depth+1 > bdb->bi_search_stack_depth ) {
ch_free( stack );
}
if( rc ) {
Debug(LDAP_DEBUG_TRACE,
"bdb_search_candidates: failed (rc=%d)\n",
rc, NULL, NULL );
} else {
Debug(LDAP_DEBUG_TRACE,
"bdb_search_candidates: id=%ld first=%ld last=%ld\n",
(long) ids[0],
(long) BDB_IDL_FIRST(ids),
(long) BDB_IDL_LAST(ids) );
}
return rc;
}
static int
parse_paged_cookie( Operation *op, SlapReply *rs )
{
int rc = LDAP_SUCCESS;
PagedResultsState *ps = op->o_pagedresults_state;
/* this function must be invoked only if the pagedResults
* control has been detected, parsed and partially checked
* by the frontend */
assert( get_pagedresults( op ) > SLAP_CONTROL_IGNORED );
/* cookie decoding/checks deferred to backend... */
if ( ps->ps_cookieval.bv_len ) {
PagedResultsCookie reqcookie;
if( ps->ps_cookieval.bv_len != sizeof( reqcookie ) ) {
/* bad cookie */
rs->sr_text = "paged results cookie is invalid";
rc = LDAP_PROTOCOL_ERROR;
goto done;
}
AC_MEMCPY( &reqcookie, ps->ps_cookieval.bv_val, sizeof( reqcookie ));
if ( reqcookie > ps->ps_cookie ) {
/* bad cookie */
rs->sr_text = "paged results cookie is invalid";
rc = LDAP_PROTOCOL_ERROR;
goto done;
} else if ( reqcookie < ps->ps_cookie ) {
rs->sr_text = "paged results cookie is invalid or old";
rc = LDAP_UNWILLING_TO_PERFORM;
goto done;
}
} else {
/* we're going to use ps_cookie */
op->o_conn->c_pagedresults_state.ps_cookie = 0;
}
done:;
return rc;
}
static void
send_paged_response(
Operation *op,
SlapReply *rs,
ID *lastid,
int tentries )
{
LDAPControl *ctrls[2];
BerElementBuffer berbuf;
BerElement *ber = (BerElement *)&berbuf;
PagedResultsCookie respcookie;
struct berval cookie;
Debug(LDAP_DEBUG_ARGS,
"send_paged_response: lastid=0x%08lx nentries=%d\n",
lastid ? *lastid : 0, rs->sr_nentries, NULL );
ctrls[1] = NULL;
ber_init2( ber, NULL, LBER_USE_DER );
if ( lastid ) {
respcookie = ( PagedResultsCookie )(*lastid);
cookie.bv_len = sizeof( respcookie );
cookie.bv_val = (char *)&respcookie;
} else {
respcookie = ( PagedResultsCookie )0;
BER_BVSTR( &cookie, "" );
}
op->o_conn->c_pagedresults_state.ps_cookie = respcookie;
op->o_conn->c_pagedresults_state.ps_count =
((PagedResultsState *)op->o_pagedresults_state)->ps_count +
rs->sr_nentries;
/* return size of 0 -- no estimate */
ber_printf( ber, "{iO}", 0, &cookie );
ctrls[0] = op->o_tmpalloc( sizeof(LDAPControl), op->o_tmpmemctx );
if ( ber_flatten2( ber, &ctrls[0]->ldctl_value, 0 ) == -1 ) {
goto done;
}
ctrls[0]->ldctl_oid = LDAP_CONTROL_PAGEDRESULTS;
ctrls[0]->ldctl_iscritical = 0;
slap_add_ctrls( op, rs, ctrls );
rs->sr_err = LDAP_SUCCESS;
send_ldap_result( op, rs );
done:
(void) ber_free_buf( ber );
}
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