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https://git.openldap.org/openldap/openldap.git
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502 lines
12 KiB
C
502 lines
12 KiB
C
/* search.c - ldbm backend search function */
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#include "portable.h"
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#include <stdio.h>
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#include <ac/string.h>
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#include <ac/socket.h>
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#include "slap.h"
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#include "back-ldbm.h"
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#include "proto-back-ldbm.h"
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static ID_BLOCK *base_candidates(Backend *be, Connection *conn, Operation *op, char *base, Filter *filter, char **attrs, int attrsonly, char **matched, int *err);
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static ID_BLOCK *onelevel_candidates(Backend *be, Connection *conn, Operation *op, char *base, Filter *filter, char **attrs, int attrsonly, char **matched, int *err);
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static ID_BLOCK *subtree_candidates(Backend *be, Connection *conn, Operation *op, char *base, Filter *filter, char **attrs, int attrsonly, char **matched, Entry *e, int *err, int lookupbase);
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#define GRABSIZE BUFSIZ
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#define MAKE_SPACE( n ) { \
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if ( rcur + (n) > rbuf + rmaxsize ) { \
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int offset = rcur - rbuf; \
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rbuf = ch_realloc( rbuf, rmaxsize + GRABSIZE ); \
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rmaxsize += GRABSIZE; \
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rcur = rbuf + offset; \
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} \
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}
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int
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ldbm_back_search(
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Backend *be,
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Connection *conn,
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Operation *op,
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char *base,
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int scope,
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int deref,
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int slimit,
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int tlimit,
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Filter *filter,
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char *filterstr,
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char **attrs,
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int attrsonly
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)
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{
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struct ldbminfo *li = (struct ldbminfo *) be->be_private;
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int err;
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time_t stoptime;
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ID_BLOCK *candidates;
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ID id;
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Entry *e;
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Attribute *ref;
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char *matched = NULL;
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int rmaxsize, nrefs;
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char *rbuf, *rcur;
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int nentries = 0;
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char *realBase;
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Debug(LDAP_DEBUG_ARGS, "=> ldbm_back_search\n", 0, 0, 0);
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if ( tlimit == 0 && be_isroot( be, op->o_ndn ) ) {
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tlimit = -1; /* allow root to set no limit */
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} else {
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tlimit = (tlimit > be->be_timelimit || tlimit < 1) ?
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be->be_timelimit : tlimit;
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stoptime = op->o_time + tlimit;
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}
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if ( slimit == 0 && be_isroot( be, op->o_ndn ) ) {
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slimit = -1; /* allow root to set no limit */
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} else {
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slimit = (slimit > be->be_sizelimit || slimit < 1) ?
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be->be_sizelimit : slimit;
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}
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/*
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* check and apply aliasing where the dereferencing applies to
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* the subordinates of the base
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*/
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switch ( deref ) {
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case LDAP_DEREF_FINDING:
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case LDAP_DEREF_ALWAYS:
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realBase = derefDN ( be, conn, op, base );
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break;
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default:
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realBase = ch_strdup(base);
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}
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(void) dn_normalize_case( realBase );
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Debug( LDAP_DEBUG_TRACE, "using base \"%s\"\n",
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realBase, 0, 0 );
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switch ( scope ) {
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case LDAP_SCOPE_BASE:
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candidates = base_candidates( be, conn, op, realBase, filter,
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attrs, attrsonly, &matched, &err );
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break;
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case LDAP_SCOPE_ONELEVEL:
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candidates = onelevel_candidates( be, conn, op, realBase, filter,
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attrs, attrsonly, &matched, &err );
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break;
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case LDAP_SCOPE_SUBTREE:
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candidates = subtree_candidates( be, conn, op, realBase, filter,
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attrs, attrsonly, &matched, NULL, &err, 1 );
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break;
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default:
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send_ldap_result( conn, op, LDAP_PROTOCOL_ERROR, "",
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"Bad scope" );
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if( realBase != NULL) {
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free( realBase );
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}
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return( -1 );
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}
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/* null candidates means we could not find the base object */
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if ( candidates == NULL ) {
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send_ldap_result( conn, op, err, matched, "" );
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if ( matched != NULL ) {
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free( matched );
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}
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if( realBase != NULL) {
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free( realBase );
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}
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return( -1 );
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}
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if ( matched != NULL ) {
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free( matched );
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}
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rmaxsize = 0;
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nrefs = 0;
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rbuf = rcur = NULL;
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MAKE_SPACE( sizeof("Referral:") + 1 );
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strcpy( rbuf, "Referral:" );
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rcur = strchr( rbuf, '\0' );
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for ( id = idl_firstid( candidates ); id != NOID;
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id = idl_nextid( candidates, id ) ) {
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/* check for abandon */
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ldap_pvt_thread_mutex_lock( &op->o_abandonmutex );
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if ( op->o_abandon ) {
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ldap_pvt_thread_mutex_unlock( &op->o_abandonmutex );
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idl_free( candidates );
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free( rbuf );
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if( realBase != NULL) {
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free( realBase );
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}
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return( 0 );
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}
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ldap_pvt_thread_mutex_unlock( &op->o_abandonmutex );
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/* check time limit */
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if ( tlimit != -1 && slap_get_time() > stoptime ) {
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send_ldap_search_result( conn, op,
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LDAP_TIMELIMIT_EXCEEDED, NULL, nrefs > 0 ? rbuf :
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NULL, nentries );
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idl_free( candidates );
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free( rbuf );
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if( realBase != NULL) {
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free( realBase );
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}
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return( 0 );
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}
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/* get the entry with reader lock */
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if ( (e = id2entry_r( be, id )) == NULL ) {
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Debug( LDAP_DEBUG_ARGS, "candidate %ld not found\n",
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id, 0, 0 );
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continue;
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}
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/*
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* if it's a referral, add it to the list of referrals. only do
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* this for subtree searches, and don't check the filter explicitly
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* here since it's only a candidate anyway.
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*/
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if ( scope == LDAP_SCOPE_SUBTREE &&
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e->e_ndn != NULL &&
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strncmp( e->e_ndn, "REF=", 4 ) == 0 &&
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(ref = attr_find( e->e_attrs, "ref" )) != NULL )
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{
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int i;
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if ( ref->a_vals == NULL ) {
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Debug( LDAP_DEBUG_ANY, "null ref in (%s)\n",
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e->e_dn, 0, 0 );
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} else {
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for ( i = 0; ref->a_vals[i] != NULL; i++ ) {
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/* referral + newline + null */
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MAKE_SPACE( ref->a_vals[i]->bv_len + 2 );
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*rcur++ = '\n';
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strncpy( rcur, ref->a_vals[i]->bv_val,
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ref->a_vals[i]->bv_len );
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rcur = rcur + ref->a_vals[i]->bv_len;
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*rcur = '\0';
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nrefs++;
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}
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}
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/* otherwise it's an entry - see if it matches the filter */
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} else {
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/* if it matches the filter and scope, send it */
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if ( test_filter( be, conn, op, e, filter ) == 0 ) {
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int scopeok;
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char *dn;
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/* check scope */
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scopeok = 1;
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if ( scope == LDAP_SCOPE_ONELEVEL ) {
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if ( (dn = dn_parent( be, e->e_dn )) != NULL ) {
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(void) dn_normalize_case( dn );
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scopeok = (dn == realBase)
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? 1
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: (strcmp( dn, realBase ) ? 0 : 1 );
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free( dn );
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} else {
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scopeok = (realBase == NULL || *realBase == '\0');
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}
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} else if ( scope == LDAP_SCOPE_SUBTREE ) {
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dn = ch_strdup( e->e_ndn );
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scopeok = dn_issuffix( dn, realBase );
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free( dn );
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}
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if ( scopeok ) {
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/* check size limit */
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if ( --slimit == -1 ) {
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cache_return_entry_r( &li->li_cache, e );
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send_ldap_search_result( conn, op,
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LDAP_SIZELIMIT_EXCEEDED, NULL,
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nrefs > 0 ? rbuf : NULL, nentries );
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idl_free( candidates );
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free( rbuf );
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if( realBase != NULL) {
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free( realBase );
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}
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return( 0 );
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}
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/*
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* check and apply aliasing where the dereferencing applies to
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* the subordinates of the base
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*/
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switch ( deref ) {
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case LDAP_DEREF_SEARCHING:
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case LDAP_DEREF_ALWAYS:
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{
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Entry *newe = derefAlias_r( be, conn, op, e );
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if ( newe == NULL ) { /* problem with the alias */
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cache_return_entry_r( &li->li_cache, e );
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e = NULL;
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}
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else if ( newe != e ) { /* reassign e */
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cache_return_entry_r( &li->li_cache, e );
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e = newe;
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}
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}
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break;
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}
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if (e) {
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switch ( send_search_entry( be, conn, op, e,
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attrs, attrsonly, 0 ) ) {
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case 0: /* entry sent ok */
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nentries++;
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break;
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case 1: /* entry not sent */
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break;
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case -1: /* connection closed */
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cache_return_entry_r( &li->li_cache, e );
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idl_free( candidates );
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free( rbuf );
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if( realBase != NULL) {
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free( realBase );
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}
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return( 0 );
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}
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}
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}
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}
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}
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if( e != NULL ) {
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/* free reader lock */
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cache_return_entry_r( &li->li_cache, e );
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}
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ldap_pvt_thread_yield();
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}
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idl_free( candidates );
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if ( nrefs > 0 ) {
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send_ldap_search_result( conn, op, LDAP_PARTIAL_RESULTS, NULL,
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rbuf, nentries );
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} else {
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send_ldap_search_result( conn, op, LDAP_SUCCESS, NULL, NULL,
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nentries );
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}
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free( rbuf );
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if( realBase != NULL) {
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free( realBase );
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}
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return( 0 );
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}
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static ID_BLOCK *
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base_candidates(
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Backend *be,
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Connection *conn,
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Operation *op,
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char *base,
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Filter *filter,
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char **attrs,
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int attrsonly,
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char **matched,
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int *err
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)
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{
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struct ldbminfo *li = (struct ldbminfo *) be->be_private;
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ID_BLOCK *idl;
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Entry *e;
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Debug(LDAP_DEBUG_TRACE, "base_candidates: base: \"%s\"\n", base, 0, 0);
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*err = LDAP_SUCCESS;
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/* get entry with reader lock */
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if ( (e = dn2entry_r( be, base, matched )) == NULL ) {
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*err = LDAP_NO_SUCH_OBJECT;
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return( NULL );
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}
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/* check for deleted */
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idl = idl_alloc( 1 );
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idl_insert( &idl, e->e_id, 1 );
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/* free reader lock */
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cache_return_entry_r( &li->li_cache, e );
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return( idl );
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}
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static ID_BLOCK *
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onelevel_candidates(
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Backend *be,
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Connection *conn,
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Operation *op,
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char *base,
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Filter *filter,
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char **attrs,
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int attrsonly,
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char **matched,
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int *err
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)
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{
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struct ldbminfo *li = (struct ldbminfo *) be->be_private;
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Entry *e = NULL;
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Filter *f;
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char buf[20];
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ID_BLOCK *candidates;
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Debug(LDAP_DEBUG_TRACE, "onelevel_candidates: base: \"%s\"\n", base, 0, 0);
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*err = LDAP_SUCCESS;
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/* get the base object with reader lock */
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if ( base != NULL && *base != '\0' &&
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(e = dn2entry_r( be, base, matched )) == NULL )
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{
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*err = LDAP_NO_SUCH_OBJECT;
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return( NULL );
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}
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/*
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* modify the filter to be something like this:
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*
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* parent=baseobject & originalfilter
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*/
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f = (Filter *) ch_malloc( sizeof(Filter) );
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f->f_next = NULL;
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f->f_choice = LDAP_FILTER_AND;
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f->f_and = (Filter *) ch_malloc( sizeof(Filter) );
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f->f_and->f_choice = LDAP_FILTER_EQUALITY;
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f->f_and->f_ava.ava_type = ch_strdup( "id2children" );
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sprintf( buf, "%ld", e != NULL ? e->e_id : 0 );
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f->f_and->f_ava.ava_value.bv_val = ch_strdup( buf );
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f->f_and->f_ava.ava_value.bv_len = strlen( buf );
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f->f_and->f_next = filter;
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/* from here, it's just like subtree_candidates */
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candidates = subtree_candidates( be, conn, op, base, f, attrs,
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attrsonly, matched, e, err, 0 );
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/* free up just the filter stuff we allocated above */
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f->f_and->f_next = NULL;
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filter_free( f );
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/* free entry and reader lock */
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if( e != NULL ) {
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cache_return_entry_r( &li->li_cache, e );
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}
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return( candidates );
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}
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static ID_BLOCK *
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subtree_candidates(
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Backend *be,
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Connection *conn,
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Operation *op,
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char *base,
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Filter *filter,
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char **attrs,
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int attrsonly,
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char **matched,
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Entry *e,
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int *err,
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int lookupbase
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)
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{
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struct ldbminfo *li = (struct ldbminfo *) be->be_private;
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Filter *f, **filterarg_ptr;
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ID_BLOCK *candidates;
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Debug(LDAP_DEBUG_TRACE, "subtree_candidates: base: \"%s\" %s\n",
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base ? base : "NULL", lookupbase ? "lookupbase" : "", 0);
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/*
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* get the base object - unless we already have it (from one-level).
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* also, unless this is a one-level search or a subtree search
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* starting at the very top of our subtree, we need to modify the
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* filter to be something like this:
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*
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* dn=*baseobjectdn & (originalfilter | ref=*)
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*
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* the "objectclass=referral" part is used to select referrals to return
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*/
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*err = LDAP_SUCCESS;
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f = NULL;
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if ( lookupbase ) {
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e = NULL;
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if ( base != NULL && *base != '\0' &&
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(e = dn2entry_r( be, base, matched )) == NULL )
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{
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*err = LDAP_NO_SUCH_OBJECT;
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return( NULL );
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}
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if (e) {
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cache_return_entry_r( &li->li_cache, e );
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}
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f = (Filter *) ch_malloc( sizeof(Filter) );
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f->f_next = NULL;
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f->f_choice = LDAP_FILTER_OR;
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f->f_or = (Filter *) ch_malloc( sizeof(Filter) );
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f->f_or->f_choice = LDAP_FILTER_EQUALITY;
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f->f_or->f_avtype = ch_strdup( "objectclass" );
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/* Patch to use normalized uppercase */
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f->f_or->f_avvalue.bv_val = ch_strdup( "REFERRAL" );
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f->f_or->f_avvalue.bv_len = strlen( "REFERRAL" );
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filterarg_ptr = &f->f_or->f_next;
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*filterarg_ptr = filter;
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filter = f;
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if ( ! be_issuffix( be, base ) ) {
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f = (Filter *) ch_malloc( sizeof(Filter) );
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f->f_next = NULL;
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f->f_choice = LDAP_FILTER_AND;
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f->f_and = (Filter *) ch_malloc( sizeof(Filter) );
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f->f_and->f_choice = LDAP_FILTER_SUBSTRINGS;
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f->f_and->f_sub_type = ch_strdup( "dn" );
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f->f_and->f_sub_initial = NULL;
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f->f_and->f_sub_any = NULL;
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f->f_and->f_sub_final = ch_strdup( base );
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value_normalize( f->f_and->f_sub_final, SYNTAX_CIS );
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f->f_and->f_next = filter;
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filter = f;
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}
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}
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candidates = filter_candidates( be, filter );
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/* free up just the parts we allocated above */
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if ( f != NULL ) {
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*filterarg_ptr = NULL;
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filter_free( f );
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}
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return( candidates );
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}
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