diff options
Diffstat (limited to '')
| -rw-r--r-- | servers/slapd/backover.c | 1440 |
1 files changed, 1440 insertions, 0 deletions
diff --git a/servers/slapd/backover.c b/servers/slapd/backover.c new file mode 100644 index 0000000..b5a44ea --- /dev/null +++ b/servers/slapd/backover.c @@ -0,0 +1,1440 @@ +/* backover.c - backend overlay routines */ +/* $OpenLDAP$ */ +/* This work is part of OpenLDAP Software <http://www.openldap.org/>. + * + * Copyright 2003-2018 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>. + */ + +/* Functions to overlay other modules over a backend. */ + +#include "portable.h" + +#include <stdio.h> + +#include <ac/string.h> +#include <ac/socket.h> + +#define SLAPD_TOOLS +#include "slap.h" +#include "config.h" + +static slap_overinst *overlays; + +static int +over_db_config( + BackendDB *be, + const char *fname, + int lineno, + int argc, + char **argv +) +{ + slap_overinfo *oi = be->bd_info->bi_private; + slap_overinst *on = oi->oi_list; + BackendInfo *bi_orig = be->bd_info; + struct ConfigOCs *be_cf_ocs = be->be_cf_ocs; + ConfigArgs ca = {0}; + int rc = 0; + + if ( oi->oi_orig->bi_db_config ) { + be->bd_info = oi->oi_orig; + be->be_cf_ocs = oi->oi_orig->bi_cf_ocs; + rc = oi->oi_orig->bi_db_config( be, fname, lineno, + argc, argv ); + + if ( be->bd_info != oi->oi_orig ) { + slap_overinfo *oi2; + slap_overinst *on2, **onp; + BackendDB be2 = *be; + int i; + + /* a database added an overlay; + * work it around... */ + assert( overlay_is_over( be ) ); + + oi2 = ( slap_overinfo * )be->bd_info->bi_private; + on2 = oi2->oi_list; + + /* need to put a uniqueness check here as well; + * note that in principle there could be more than + * one overlay as a result of multiple calls to + * overlay_config() */ + be2.bd_info = (BackendInfo *)oi; + + for ( i = 0, onp = &on2; *onp; i++, onp = &(*onp)->on_next ) { + if ( overlay_is_inst( &be2, (*onp)->on_bi.bi_type ) ) { + Debug( LDAP_DEBUG_ANY, "over_db_config(): " + "warning, freshly added " + "overlay #%d \"%s\" is already in list\n", + i, (*onp)->on_bi.bi_type, 0 ); + + /* NOTE: if the overlay already exists, + * there is no way to merge the results + * of the configuration that may have + * occurred during bi_db_config(); we + * just issue a warning, and the + * administrator should deal with this */ + } + } + *onp = oi->oi_list; + + oi->oi_list = on2; + + ch_free( be->bd_info ); + } + + be->bd_info = (BackendInfo *)oi; + if ( rc != SLAP_CONF_UNKNOWN ) return rc; + } + + ca.argv = argv; + ca.argc = argc; + ca.fname = fname; + ca.lineno = lineno; + ca.be = be; + snprintf( ca.log, sizeof( ca.log ), "%s: line %d", + ca.fname, ca.lineno ); + ca.op = SLAP_CONFIG_ADD; + ca.valx = -1; + + for (; on; on=on->on_next) { + rc = SLAP_CONF_UNKNOWN; + if (on->on_bi.bi_cf_ocs) { + ConfigTable *ct; + ca.bi = &on->on_bi; + ct = config_find_keyword( on->on_bi.bi_cf_ocs->co_table, &ca ); + if ( ct ) { + ca.table = on->on_bi.bi_cf_ocs->co_type; + rc = config_add_vals( ct, &ca ); + if ( rc != SLAP_CONF_UNKNOWN ) + break; + } + } + if (on->on_bi.bi_db_config && rc == SLAP_CONF_UNKNOWN) { + be->bd_info = &on->on_bi; + rc = on->on_bi.bi_db_config( be, fname, lineno, + argc, argv ); + if ( rc != SLAP_CONF_UNKNOWN ) break; + } + } + be->bd_info = bi_orig; + be->be_cf_ocs = be_cf_ocs; + + return rc; +} + +static int +over_db_open( + BackendDB *be, + ConfigReply *cr +) +{ + slap_overinfo *oi = be->bd_info->bi_private; + slap_overinst *on = oi->oi_list; + BackendDB db = *be; + int rc = 0; + + db.be_flags |= SLAP_DBFLAG_OVERLAY; + db.bd_info = oi->oi_orig; + if ( db.bd_info->bi_db_open ) { + rc = db.bd_info->bi_db_open( &db, cr ); + } + + for (; on && rc == 0; on=on->on_next) { + db.bd_info = &on->on_bi; + if ( db.bd_info->bi_db_open ) { + rc = db.bd_info->bi_db_open( &db, cr ); + } + } + + return rc; +} + +static int +over_db_close( + BackendDB *be, + ConfigReply *cr +) +{ + slap_overinfo *oi = be->bd_info->bi_private; + slap_overinst *on = oi->oi_list; + BackendInfo *bi_orig = be->bd_info; + int rc = 0; + + for (; on && rc == 0; on=on->on_next) { + be->bd_info = &on->on_bi; + if ( be->bd_info->bi_db_close ) { + rc = be->bd_info->bi_db_close( be, cr ); + } + } + + if ( oi->oi_orig->bi_db_close ) { + be->bd_info = oi->oi_orig; + rc = be->bd_info->bi_db_close( be, cr ); + } + + be->bd_info = bi_orig; + return rc; +} + +static int +over_db_destroy( + BackendDB *be, + ConfigReply *cr +) +{ + slap_overinfo *oi = be->bd_info->bi_private; + slap_overinst *on = oi->oi_list, *next; + BackendInfo *bi_orig = be->bd_info; + int rc = 0; + + be->bd_info = oi->oi_orig; + if ( be->bd_info->bi_db_destroy ) { + rc = be->bd_info->bi_db_destroy( be, cr ); + } + + for (; on && rc == 0; on=on->on_next) { + be->bd_info = &on->on_bi; + if ( be->bd_info->bi_db_destroy ) { + rc = be->bd_info->bi_db_destroy( be, cr ); + } + } + + on = oi->oi_list; + if ( on ) { + for (next = on->on_next; on; on=next) { + next = on->on_next; + free( on ); + } + } + be->bd_info = bi_orig; + free( oi ); + return rc; +} + +static int +over_back_response ( Operation *op, SlapReply *rs ) +{ + slap_overinfo *oi = op->o_callback->sc_private; + slap_overinst *on = oi->oi_list; + int rc = SLAP_CB_CONTINUE; + BackendDB *be = op->o_bd, db = *op->o_bd; + + db.be_flags |= SLAP_DBFLAG_OVERLAY; + op->o_bd = &db; + for (; on; on=on->on_next ) { + if ( on->on_response ) { + db.bd_info = (BackendInfo *)on; + rc = on->on_response( op, rs ); + if ( rc != SLAP_CB_CONTINUE ) break; + } + } + /* Bypass the remaining on_response layers, but allow + * normal execution to continue. + */ + if ( rc == SLAP_CB_BYPASS ) + rc = SLAP_CB_CONTINUE; + op->o_bd = be; + return rc; +} + +static int +over_access_allowed( + Operation *op, + Entry *e, + AttributeDescription *desc, + struct berval *val, + slap_access_t access, + AccessControlState *state, + slap_mask_t *maskp ) +{ + slap_overinfo *oi; + slap_overinst *on; + BackendInfo *bi; + BackendDB *be = op->o_bd, db; + int rc = SLAP_CB_CONTINUE; + + /* FIXME: used to happen for instance during abandon + * when global overlays are used... */ + assert( op->o_bd != NULL ); + + bi = op->o_bd->bd_info; + /* Were we invoked on the frontend? */ + if ( !bi->bi_access_allowed ) { + oi = frontendDB->bd_info->bi_private; + } else { + oi = op->o_bd->bd_info->bi_private; + } + on = oi->oi_list; + + for ( ; on; on = on->on_next ) { + if ( on->on_bi.bi_access_allowed ) { + /* NOTE: do not copy the structure until required */ + if ( !SLAP_ISOVERLAY( op->o_bd ) ) { + db = *op->o_bd; + db.be_flags |= SLAP_DBFLAG_OVERLAY; + op->o_bd = &db; + } + + op->o_bd->bd_info = (BackendInfo *)on; + rc = on->on_bi.bi_access_allowed( op, e, + desc, val, access, state, maskp ); + if ( rc != SLAP_CB_CONTINUE ) break; + } + } + + if ( rc == SLAP_CB_CONTINUE ) { + BI_access_allowed *bi_access_allowed; + + /* if the database structure was changed, o_bd points to a + * copy of the structure; put the original bd_info in place */ + if ( SLAP_ISOVERLAY( op->o_bd ) ) { + op->o_bd->bd_info = oi->oi_orig; + } + + if ( oi->oi_orig->bi_access_allowed ) { + bi_access_allowed = oi->oi_orig->bi_access_allowed; + } else { + bi_access_allowed = slap_access_allowed; + } + + rc = bi_access_allowed( op, e, + desc, val, access, state, maskp ); + } + /* should not fall thru this far without anything happening... */ + if ( rc == SLAP_CB_CONTINUE ) { + /* access not allowed */ + rc = 0; + } + + op->o_bd = be; + op->o_bd->bd_info = bi; + + return rc; +} + +int +overlay_entry_get_ov( + Operation *op, + struct berval *dn, + ObjectClass *oc, + AttributeDescription *ad, + int rw, + Entry **e, + slap_overinst *on ) +{ + slap_overinfo *oi = on->on_info; + BackendDB *be = op->o_bd, db; + BackendInfo *bi = op->o_bd->bd_info; + int rc = SLAP_CB_CONTINUE; + + for ( ; on; on = on->on_next ) { + if ( on->on_bi.bi_entry_get_rw ) { + /* NOTE: do not copy the structure until required */ + if ( !SLAP_ISOVERLAY( op->o_bd ) ) { + db = *op->o_bd; + db.be_flags |= SLAP_DBFLAG_OVERLAY; + op->o_bd = &db; + } + + op->o_bd->bd_info = (BackendInfo *)on; + rc = on->on_bi.bi_entry_get_rw( op, dn, + oc, ad, rw, e ); + if ( rc != SLAP_CB_CONTINUE ) break; + } + } + + if ( rc == SLAP_CB_CONTINUE ) { + /* if the database structure was changed, o_bd points to a + * copy of the structure; put the original bd_info in place */ + if ( SLAP_ISOVERLAY( op->o_bd ) ) { + op->o_bd->bd_info = oi->oi_orig; + } + + if ( oi->oi_orig->bi_entry_get_rw ) { + rc = oi->oi_orig->bi_entry_get_rw( op, dn, + oc, ad, rw, e ); + } + } + /* should not fall thru this far without anything happening... */ + if ( rc == SLAP_CB_CONTINUE ) { + rc = LDAP_UNWILLING_TO_PERFORM; + } + + op->o_bd = be; + op->o_bd->bd_info = bi; + + return rc; +} + +static int +over_entry_get_rw( + Operation *op, + struct berval *dn, + ObjectClass *oc, + AttributeDescription *ad, + int rw, + Entry **e ) +{ + slap_overinfo *oi; + slap_overinst *on; + + assert( op->o_bd != NULL ); + + oi = op->o_bd->bd_info->bi_private; + on = oi->oi_list; + + return overlay_entry_get_ov( op, dn, oc, ad, rw, e, on ); +} + +int +overlay_entry_release_ov( + Operation *op, + Entry *e, + int rw, + slap_overinst *on ) +{ + slap_overinfo *oi = on->on_info; + BackendDB *be = op->o_bd, db; + BackendInfo *bi = op->o_bd->bd_info; + int rc = SLAP_CB_CONTINUE; + + for ( ; on; on = on->on_next ) { + if ( on->on_bi.bi_entry_release_rw ) { + /* NOTE: do not copy the structure until required */ + if ( !SLAP_ISOVERLAY( op->o_bd ) ) { + db = *op->o_bd; + db.be_flags |= SLAP_DBFLAG_OVERLAY; + op->o_bd = &db; + } + + op->o_bd->bd_info = (BackendInfo *)on; + rc = on->on_bi.bi_entry_release_rw( op, e, rw ); + if ( rc != SLAP_CB_CONTINUE ) break; + } + } + + if ( rc == SLAP_CB_CONTINUE ) { + /* if the database structure was changed, o_bd points to a + * copy of the structure; put the original bd_info in place */ + if ( SLAP_ISOVERLAY( op->o_bd ) ) { + op->o_bd->bd_info = oi->oi_orig; + } + + if ( oi->oi_orig->bi_entry_release_rw ) { + rc = oi->oi_orig->bi_entry_release_rw( op, e, rw ); + } + } + /* should not fall thru this far without anything happening... */ + if ( rc == SLAP_CB_CONTINUE ) { + entry_free( e ); + rc = 0; + } + + op->o_bd = be; + op->o_bd->bd_info = bi; + + return rc; +} + +static int +over_entry_release_rw( + Operation *op, + Entry *e, + int rw ) +{ + slap_overinfo *oi; + slap_overinst *on; + + assert( op->o_bd != NULL ); + + oi = op->o_bd->bd_info->bi_private; + on = oi->oi_list; + + return overlay_entry_release_ov( op, e, rw, on ); +} + +static int +over_acl_group( + Operation *op, + Entry *e, + struct berval *gr_ndn, + struct berval *op_ndn, + ObjectClass *group_oc, + AttributeDescription *group_at ) +{ + slap_overinfo *oi; + slap_overinst *on; + BackendInfo *bi; + BackendDB *be = op->o_bd, db; + int rc = SLAP_CB_CONTINUE; + + /* FIXME: used to happen for instance during abandon + * when global overlays are used... */ + assert( be != NULL ); + + bi = be->bd_info; + oi = bi->bi_private; + on = oi->oi_list; + + for ( ; on; on = on->on_next ) { + if ( on->on_bi.bi_acl_group ) { + /* NOTE: do not copy the structure until required */ + if ( !SLAP_ISOVERLAY( op->o_bd ) ) { + db = *op->o_bd; + db.be_flags |= SLAP_DBFLAG_OVERLAY; + op->o_bd = &db; + } + + op->o_bd->bd_info = (BackendInfo *)on; + rc = on->on_bi.bi_acl_group( op, e, + gr_ndn, op_ndn, group_oc, group_at ); + if ( rc != SLAP_CB_CONTINUE ) break; + } + } + + if ( rc == SLAP_CB_CONTINUE ) { + BI_acl_group *bi_acl_group; + + /* if the database structure was changed, o_bd points to a + * copy of the structure; put the original bd_info in place */ + if ( SLAP_ISOVERLAY( op->o_bd ) ) { + op->o_bd->bd_info = oi->oi_orig; + } + + if ( oi->oi_orig->bi_acl_group ) { + bi_acl_group = oi->oi_orig->bi_acl_group; + } else { + bi_acl_group = backend_group; + } + + rc = bi_acl_group( op, e, + gr_ndn, op_ndn, group_oc, group_at ); + } + /* should not fall thru this far without anything happening... */ + if ( rc == SLAP_CB_CONTINUE ) { + /* access not allowed */ + rc = 0; + } + + op->o_bd = be; + op->o_bd->bd_info = bi; + + return rc; +} + +static int +over_acl_attribute( + Operation *op, + Entry *target, + struct berval *entry_ndn, + AttributeDescription *entry_at, + BerVarray *vals, + slap_access_t access ) +{ + slap_overinfo *oi; + slap_overinst *on; + BackendInfo *bi; + BackendDB *be = op->o_bd, db; + int rc = SLAP_CB_CONTINUE; + + /* FIXME: used to happen for instance during abandon + * when global overlays are used... */ + assert( be != NULL ); + + bi = be->bd_info; + oi = bi->bi_private; + on = oi->oi_list; + + for ( ; on; on = on->on_next ) { + if ( on->on_bi.bi_acl_attribute ) { + /* NOTE: do not copy the structure until required */ + if ( !SLAP_ISOVERLAY( op->o_bd ) ) { + db = *op->o_bd; + db.be_flags |= SLAP_DBFLAG_OVERLAY; + op->o_bd = &db; + } + + op->o_bd->bd_info = (BackendInfo *)on; + rc = on->on_bi.bi_acl_attribute( op, target, + entry_ndn, entry_at, vals, access ); + if ( rc != SLAP_CB_CONTINUE ) break; + } + } + + if ( rc == SLAP_CB_CONTINUE ) { + BI_acl_attribute *bi_acl_attribute; + + /* if the database structure was changed, o_bd points to a + * copy of the structure; put the original bd_info in place */ + if ( SLAP_ISOVERLAY( op->o_bd ) ) { + op->o_bd->bd_info = oi->oi_orig; + } + + if ( oi->oi_orig->bi_acl_attribute ) { + bi_acl_attribute = oi->oi_orig->bi_acl_attribute; + } else { + bi_acl_attribute = backend_attribute; + } + + rc = bi_acl_attribute( op, target, + entry_ndn, entry_at, vals, access ); + } + /* should not fall thru this far without anything happening... */ + if ( rc == SLAP_CB_CONTINUE ) { + /* access not allowed */ + rc = 0; + } + + op->o_bd = be; + op->o_bd->bd_info = bi; + + return rc; +} + +int +overlay_callback_after_backover( Operation *op, slap_callback *sc, int append ) +{ + slap_callback **scp; + + for ( scp = &op->o_callback; *scp != NULL; scp = &(*scp)->sc_next ) { + if ( (*scp)->sc_response == over_back_response ) { + sc->sc_next = (*scp)->sc_next; + (*scp)->sc_next = sc; + return 0; + } + } + + if ( append ) { + *scp = sc; + return 0; + } + + return 1; +} + +/* + * default return code in case of missing backend function + * and overlay stack returning SLAP_CB_CONTINUE + */ +static int op_rc[ op_last ] = { + LDAP_UNWILLING_TO_PERFORM, /* bind */ + LDAP_UNWILLING_TO_PERFORM, /* unbind */ + LDAP_UNWILLING_TO_PERFORM, /* search */ + SLAP_CB_CONTINUE, /* compare; pass to frontend */ + LDAP_UNWILLING_TO_PERFORM, /* modify */ + LDAP_UNWILLING_TO_PERFORM, /* modrdn */ + LDAP_UNWILLING_TO_PERFORM, /* add */ + LDAP_UNWILLING_TO_PERFORM, /* delete */ + LDAP_UNWILLING_TO_PERFORM, /* abandon */ + LDAP_UNWILLING_TO_PERFORM, /* cancel */ + LDAP_UNWILLING_TO_PERFORM, /* extended */ + LDAP_SUCCESS, /* aux_operational */ + LDAP_SUCCESS, /* aux_chk_referrals */ + SLAP_CB_CONTINUE /* aux_chk_controls; pass to frontend */ +}; + +int overlay_op_walk( + Operation *op, + SlapReply *rs, + slap_operation_t which, + slap_overinfo *oi, + slap_overinst *on +) +{ + BI_op_bind **func; + int rc = SLAP_CB_CONTINUE; + + for (; on; on=on->on_next ) { + func = &on->on_bi.bi_op_bind; + if ( func[which] ) { + op->o_bd->bd_info = (BackendInfo *)on; + rc = func[which]( op, rs ); + if ( rc != SLAP_CB_CONTINUE ) break; + } + } + if ( rc == SLAP_CB_BYPASS ) + rc = SLAP_CB_CONTINUE; + + /* if an overlay halted processing, make sure + * any previously set cleanup handlers are run + */ + if ( rc != SLAP_CB_CONTINUE ) + goto cleanup; + + func = &oi->oi_orig->bi_op_bind; + if ( func[which] ) { + op->o_bd->bd_info = oi->oi_orig; + rc = func[which]( op, rs ); + } + /* should not fall thru this far without anything happening... */ + if ( rc == SLAP_CB_CONTINUE ) { + rc = op_rc[ which ]; + } + + /* The underlying backend didn't handle the request, make sure + * overlay cleanup is processed. + */ + if ( rc == LDAP_UNWILLING_TO_PERFORM ) { + slap_callback *sc_next; +cleanup: + for ( ; op->o_callback && op->o_callback->sc_response != + over_back_response; op->o_callback = sc_next ) { + sc_next = op->o_callback->sc_next; + if ( op->o_callback->sc_cleanup ) { + op->o_callback->sc_cleanup( op, rs ); + } + } + } + return rc; +} + +static int +over_op_func( + Operation *op, + SlapReply *rs, + slap_operation_t which +) +{ + slap_overinfo *oi; + slap_overinst *on; + BackendDB *be = op->o_bd, db; + slap_callback cb = {NULL, over_back_response, NULL, NULL}, **sc; + int rc = SLAP_CB_CONTINUE; + + /* FIXME: used to happen for instance during abandon + * when global overlays are used... */ + assert( op->o_bd != NULL ); + + oi = op->o_bd->bd_info->bi_private; + on = oi->oi_list; + + if ( !SLAP_ISOVERLAY( op->o_bd )) { + db = *op->o_bd; + db.be_flags |= SLAP_DBFLAG_OVERLAY; + op->o_bd = &db; + } + cb.sc_next = op->o_callback; + cb.sc_private = oi; + op->o_callback = &cb; + + rc = overlay_op_walk( op, rs, which, oi, on ); + for ( sc = &op->o_callback; *sc; sc = &(*sc)->sc_next ) { + if ( *sc == &cb ) { + *sc = cb.sc_next; + break; + } + } + + op->o_bd = be; + return rc; +} + +static int +over_op_bind( Operation *op, SlapReply *rs ) +{ + return over_op_func( op, rs, op_bind ); +} + +static int +over_op_unbind( Operation *op, SlapReply *rs ) +{ + return over_op_func( op, rs, op_unbind ); +} + +static int +over_op_search( Operation *op, SlapReply *rs ) +{ + return over_op_func( op, rs, op_search ); +} + +static int +over_op_compare( Operation *op, SlapReply *rs ) +{ + return over_op_func( op, rs, op_compare ); +} + +static int +over_op_modify( Operation *op, SlapReply *rs ) +{ + return over_op_func( op, rs, op_modify ); +} + +static int +over_op_modrdn( Operation *op, SlapReply *rs ) +{ + return over_op_func( op, rs, op_modrdn ); +} + +static int +over_op_add( Operation *op, SlapReply *rs ) +{ + return over_op_func( op, rs, op_add ); +} + +static int +over_op_delete( Operation *op, SlapReply *rs ) +{ + return over_op_func( op, rs, op_delete ); +} + +static int +over_op_abandon( Operation *op, SlapReply *rs ) +{ + return over_op_func( op, rs, op_abandon ); +} + +static int +over_op_cancel( Operation *op, SlapReply *rs ) +{ + return over_op_func( op, rs, op_cancel ); +} + +static int +over_op_extended( Operation *op, SlapReply *rs ) +{ + return over_op_func( op, rs, op_extended ); +} + +static int +over_aux_operational( Operation *op, SlapReply *rs ) +{ + return over_op_func( op, rs, op_aux_operational ); +} + +static int +over_aux_chk_referrals( Operation *op, SlapReply *rs ) +{ + return over_op_func( op, rs, op_aux_chk_referrals ); +} + +static int +over_aux_chk_controls( Operation *op, SlapReply *rs ) +{ + return over_op_func( op, rs, op_aux_chk_controls ); +} + +enum conn_which { + conn_init = 0, + conn_destroy, + conn_last +}; + +static int +over_connection_func( + BackendDB *bd, + Connection *conn, + enum conn_which which +) +{ + slap_overinfo *oi; + slap_overinst *on; + BackendDB db; + int rc = SLAP_CB_CONTINUE; + BI_connection_init **func; + + /* FIXME: used to happen for instance during abandon + * when global overlays are used... */ + assert( bd != NULL ); + + oi = bd->bd_info->bi_private; + on = oi->oi_list; + + if ( !SLAP_ISOVERLAY( bd ) ) { + db = *bd; + db.be_flags |= SLAP_DBFLAG_OVERLAY; + bd = &db; + } + + for ( ; on; on = on->on_next ) { + func = &on->on_bi.bi_connection_init; + if ( func[ which ] ) { + bd->bd_info = (BackendInfo *)on; + rc = func[ which ]( bd, conn ); + if ( rc != SLAP_CB_CONTINUE ) break; + } + } + + func = &oi->oi_orig->bi_connection_init; + if ( func[ which ] && rc == SLAP_CB_CONTINUE ) { + bd->bd_info = oi->oi_orig; + rc = func[ which ]( bd, conn ); + } + /* should not fall thru this far without anything happening... */ + if ( rc == SLAP_CB_CONTINUE ) { + rc = LDAP_UNWILLING_TO_PERFORM; + } + + return rc; +} + +static int +over_connection_init( + BackendDB *bd, + Connection *conn +) +{ + return over_connection_func( bd, conn, conn_init ); +} + +static int +over_connection_destroy( + BackendDB *bd, + Connection *conn +) +{ + return over_connection_func( bd, conn, conn_destroy ); +} + +int +overlay_register( + slap_overinst *on +) +{ + slap_overinst *tmp; + + /* FIXME: check for duplicates? */ + for ( tmp = overlays; tmp != NULL; tmp = tmp->on_next ) { + if ( strcmp( on->on_bi.bi_type, tmp->on_bi.bi_type ) == 0 ) { + Debug( LDAP_DEBUG_ANY, + "overlay_register(\"%s\"): " + "name already in use.\n", + on->on_bi.bi_type, 0, 0 ); + return -1; + } + + if ( on->on_bi.bi_obsolete_names != NULL ) { + int i; + + for ( i = 0; on->on_bi.bi_obsolete_names[ i ] != NULL; i++ ) { + if ( strcmp( on->on_bi.bi_obsolete_names[ i ], tmp->on_bi.bi_type ) == 0 ) { + Debug( LDAP_DEBUG_ANY, + "overlay_register(\"%s\"): " + "obsolete name \"%s\" already in use " + "by overlay \"%s\".\n", + on->on_bi.bi_type, + on->on_bi.bi_obsolete_names[ i ], + tmp->on_bi.bi_type ); + return -1; + } + } + } + + if ( tmp->on_bi.bi_obsolete_names != NULL ) { + int i; + + for ( i = 0; tmp->on_bi.bi_obsolete_names[ i ] != NULL; i++ ) { + int j; + + if ( strcmp( on->on_bi.bi_type, tmp->on_bi.bi_obsolete_names[ i ] ) == 0 ) { + Debug( LDAP_DEBUG_ANY, + "overlay_register(\"%s\"): " + "name already in use " + "as obsolete by overlay \"%s\".\n", + on->on_bi.bi_type, + tmp->on_bi.bi_obsolete_names[ i ], 0 ); + return -1; + } + + if ( on->on_bi.bi_obsolete_names != NULL ) { + for ( j = 0; on->on_bi.bi_obsolete_names[ j ] != NULL; j++ ) { + if ( strcmp( on->on_bi.bi_obsolete_names[ j ], tmp->on_bi.bi_obsolete_names[ i ] ) == 0 ) { + Debug( LDAP_DEBUG_ANY, + "overlay_register(\"%s\"): " + "obsolete name \"%s\" already in use " + "as obsolete by overlay \"%s\".\n", + on->on_bi.bi_type, + on->on_bi.bi_obsolete_names[ j ], + tmp->on_bi.bi_type ); + return -1; + } + } + } + } + } + } + + on->on_next = overlays; + overlays = on; + return 0; +} + +/* + * iterator on registered overlays; overlay_next( NULL ) returns the first + * overlay; subsequent calls with the previously returned value allow to + * iterate over the entire list; returns NULL when no more overlays are + * registered. + */ + +slap_overinst * +overlay_next( + slap_overinst *on +) +{ + if ( on == NULL ) { + return overlays; + } + + return on->on_next; +} + +/* + * returns a specific registered overlay based on the type; NULL if not + * registered. + */ + +slap_overinst * +overlay_find( const char *over_type ) +{ + slap_overinst *on = overlays; + + assert( over_type != NULL ); + + for ( ; on; on = on->on_next ) { + if ( strcmp( on->on_bi.bi_type, over_type ) == 0 ) { + goto foundit; + } + + if ( on->on_bi.bi_obsolete_names != NULL ) { + int i; + + for ( i = 0; on->on_bi.bi_obsolete_names[ i ] != NULL; i++ ) { + if ( strcmp( on->on_bi.bi_obsolete_names[ i ], over_type ) == 0 ) { + Debug( LDAP_DEBUG_ANY, + "overlay_find(\"%s\"): " + "obsolete name for \"%s\".\n", + on->on_bi.bi_obsolete_names[ i ], + on->on_bi.bi_type, 0 ); + goto foundit; + } + } + } + } + +foundit:; + return on; +} + +static const char overtype[] = "over"; + +/* + * returns TRUE (1) if the database is actually an overlay instance; + * FALSE (0) otherwise. + */ + +int +overlay_is_over( BackendDB *be ) +{ + return be->bd_info->bi_type == overtype; +} + +/* + * returns TRUE (1) if the given database is actually an overlay + * instance and, somewhere in the list, contains the requested overlay; + * FALSE (0) otherwise. + */ + +int +overlay_is_inst( BackendDB *be, const char *over_type ) +{ + slap_overinst *on; + + assert( be != NULL ); + + if ( !overlay_is_over( be ) ) { + return 0; + } + + on = ((slap_overinfo *)be->bd_info->bi_private)->oi_list; + for ( ; on; on = on->on_next ) { + if ( strcmp( on->on_bi.bi_type, over_type ) == 0 ) { + return 1; + } + } + + return 0; +} + +int +overlay_register_control( BackendDB *be, const char *oid ) +{ + int gotit = 0; + int cid; + + if ( slap_find_control_id( oid, &cid ) == LDAP_CONTROL_NOT_FOUND ) { + return -1; + } + + if ( SLAP_ISGLOBALOVERLAY( be ) ) { + BackendDB *bd; + + /* add to all backends... */ + LDAP_STAILQ_FOREACH( bd, &backendDB, be_next ) { + if ( bd == be->bd_self ) { + gotit = 1; + } + + /* overlays can be instanciated multiple times, use + * be_ctrls[ cid ] as an instance counter, so that the + * overlay's controls are only really disabled after the + * last instance called overlay_register_control() */ + bd->be_ctrls[ cid ]++; + bd->be_ctrls[ SLAP_MAX_CIDS ] = 1; + } + + } + + if ( !gotit ) { + /* overlays can be instanciated multiple times, use + * be_ctrls[ cid ] as an instance counter, so that the + * overlay's controls are only really unregistered after the + * last instance called overlay_register_control() */ + be->bd_self->be_ctrls[ cid ]++; + be->bd_self->be_ctrls[ SLAP_MAX_CIDS ] = 1; + } + + return 0; +} + +#ifdef SLAP_CONFIG_DELETE +void +overlay_unregister_control( BackendDB *be, const char *oid ) +{ + int gotit = 0; + int cid; + + if ( slap_find_control_id( oid, &cid ) == LDAP_CONTROL_NOT_FOUND ) { + return; + } + + if ( SLAP_ISGLOBALOVERLAY( be ) ) { + BackendDB *bd; + + /* remove from all backends... */ + LDAP_STAILQ_FOREACH( bd, &backendDB, be_next ) { + if ( bd == be->bd_self ) { + gotit = 1; + } + + bd->be_ctrls[ cid ]--; + } + } + + if ( !gotit ) { + be->bd_self->be_ctrls[ cid ]--; + } +} +#endif /* SLAP_CONFIG_DELETE */ + +void +overlay_destroy_one( BackendDB *be, slap_overinst *on ) +{ + slap_overinfo *oi = on->on_info; + slap_overinst **oidx; + + for ( oidx = &oi->oi_list; *oidx; oidx = &(*oidx)->on_next ) { + if ( *oidx == on ) { + *oidx = on->on_next; + if ( on->on_bi.bi_db_destroy ) { + BackendInfo *bi_orig = be->bd_info; + be->bd_info = (BackendInfo *)on; + on->on_bi.bi_db_destroy( be, NULL ); + be->bd_info = bi_orig; + } + free( on ); + break; + } + } +} + +#ifdef SLAP_CONFIG_DELETE +typedef struct ov_remove_ctx { + BackendDB *be; + slap_overinst *on; +} ov_remove_ctx; + +int +overlay_remove_cb( Operation *op, SlapReply *rs ) +{ + ov_remove_ctx *rm_ctx = (ov_remove_ctx*) op->o_callback->sc_private; + BackendInfo *bi_orig = rm_ctx->be->bd_info; + + rm_ctx->be->bd_info = (BackendInfo*) rm_ctx->on; + + if ( rm_ctx->on->on_bi.bi_db_close ) { + rm_ctx->on->on_bi.bi_db_close( rm_ctx->be, NULL ); + } + if ( rm_ctx->on->on_bi.bi_db_destroy ) { + rm_ctx->on->on_bi.bi_db_destroy( rm_ctx->be, NULL ); + } + + /* clean up after removing last overlay */ + if ( ! rm_ctx->on->on_info->oi_list ) { + /* reset db flags and bd_info to orig */ + SLAP_DBFLAGS( rm_ctx->be ) &= ~SLAP_DBFLAG_GLOBAL_OVERLAY; + rm_ctx->be->bd_info = rm_ctx->on->on_info->oi_orig; + ch_free(rm_ctx->on->on_info); + } else { + rm_ctx->be->bd_info = bi_orig; + } + free( rm_ctx->on ); + op->o_tmpfree(rm_ctx, op->o_tmpmemctx); + return SLAP_CB_CONTINUE; +} + +void +overlay_remove( BackendDB *be, slap_overinst *on, Operation *op ) +{ + slap_overinfo *oi = on->on_info; + slap_overinst **oidx; + ov_remove_ctx *rm_ctx; + slap_callback *rm_cb, *cb; + + /* remove overlay from oi_list */ + for ( oidx = &oi->oi_list; *oidx; oidx = &(*oidx)->on_next ) { + if ( *oidx == on ) { + *oidx = on->on_next; + break; + } + } + + /* The db_close and db_destroy handlers to cleanup a release + * the overlay's resources are called from the cleanup callback + */ + rm_ctx = op->o_tmpalloc( sizeof( ov_remove_ctx ), op->o_tmpmemctx ); + rm_ctx->be = be; + rm_ctx->on = on; + + rm_cb = op->o_tmpalloc( sizeof( slap_callback ), op->o_tmpmemctx ); + rm_cb->sc_next = NULL; + rm_cb->sc_cleanup = overlay_remove_cb; + rm_cb->sc_response = NULL; + rm_cb->sc_private = (void*) rm_ctx; + rm_cb->sc_writewait = NULL; + + /* Append callback to the end of the list */ + if ( !op->o_callback ) { + op->o_callback = rm_cb; + } else { + for ( cb = op->o_callback; cb->sc_next; cb = cb->sc_next ); + cb->sc_next = rm_cb; + } +} +#endif /* SLAP_CONFIG_DELETE */ + +void +overlay_insert( BackendDB *be, slap_overinst *on2, slap_overinst ***prev, + int idx ) +{ + slap_overinfo *oi = (slap_overinfo *)be->bd_info; + + if ( idx == -1 ) { + on2->on_next = oi->oi_list; + oi->oi_list = on2; + } else { + int i, novs; + slap_overinst *on, **prev; + + /* Since the list is in reverse order and is singly linked, + * we have to count the overlays and then insert backwards. + * Adding on overlay at a specific point should be a pretty + * infrequent occurrence. + */ + novs = 0; + for ( on = oi->oi_list; on; on=on->on_next ) + novs++; + + if (idx > novs) + idx = 0; + else + idx = novs - idx; + + /* advance to insertion point */ + prev = &oi->oi_list; + for ( i=0; i<idx; i++ ) { + on = *prev; + prev = &on->on_next; + } + /* insert */ + on2->on_next = *prev; + *prev = on2; + } +} + +void +overlay_move( BackendDB *be, slap_overinst *on, int idx ) +{ + slap_overinfo *oi = (slap_overinfo *)be->bd_info; + slap_overinst **onp; + + for (onp = &oi->oi_list; *onp; onp= &(*onp)->on_next) { + if ( *onp == on ) { + *onp = on->on_next; + break; + } + } + overlay_insert( be, on, &onp, idx ); +} + +/* add an overlay to a particular backend. */ +int +overlay_config( BackendDB *be, const char *ov, int idx, BackendInfo **res, ConfigReply *cr ) +{ + slap_overinst *on = NULL, *on2 = NULL, **prev; + slap_overinfo *oi = NULL; + BackendInfo *bi = NULL; + + if ( res ) + *res = NULL; + + on = overlay_find( ov ); + if ( !on ) { + Debug( LDAP_DEBUG_ANY, "overlay \"%s\" not found\n", ov, 0, 0 ); + return 1; + } + + /* If this is the first overlay on this backend, set up the + * overlay info structure + */ + if ( !overlay_is_over( be ) ) { + int isglobal = 0; + + /* NOTE: the first time a global overlay is configured, + * frontendDB gets this flag; it is used later by overlays + * to determine if they're stacked on top of the frontendDB */ + if ( be->bd_info == frontendDB->bd_info || SLAP_ISGLOBALOVERLAY( be ) ) { + isglobal = 1; + if ( on->on_bi.bi_flags & SLAPO_BFLAG_DBONLY ) { + Debug( LDAP_DEBUG_ANY, "overlay_config(): " + "overlay \"%s\" cannot be global.\n", + ov, 0, 0 ); + return 1; + } + + } else if ( on->on_bi.bi_flags & SLAPO_BFLAG_GLOBONLY ) { + Debug( LDAP_DEBUG_ANY, "overlay_config(): " + "overlay \"%s\" can only be global.\n", + ov, 0, 0 ); + return 1; + } + + oi = ch_malloc( sizeof( slap_overinfo ) ); + oi->oi_orig = be->bd_info; + oi->oi_bi = *be->bd_info; + oi->oi_origdb = be; + + if ( isglobal ) { + SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLOBAL_OVERLAY; + } + + /* Save a pointer to ourself in bi_private. + */ + oi->oi_bi.bi_private = oi; + oi->oi_list = NULL; + bi = (BackendInfo *)oi; + + bi->bi_type = (char *)overtype; + + bi->bi_db_config = over_db_config; + bi->bi_db_open = over_db_open; + bi->bi_db_close = over_db_close; + bi->bi_db_destroy = over_db_destroy; + + bi->bi_op_bind = over_op_bind; + bi->bi_op_unbind = over_op_unbind; + bi->bi_op_search = over_op_search; + bi->bi_op_compare = over_op_compare; + bi->bi_op_modify = over_op_modify; + bi->bi_op_modrdn = over_op_modrdn; + bi->bi_op_add = over_op_add; + bi->bi_op_delete = over_op_delete; + bi->bi_op_abandon = over_op_abandon; + bi->bi_op_cancel = over_op_cancel; + + bi->bi_extended = over_op_extended; + + /* + * this is fine because it has the same + * args of the operations; we need to rework + * all the hooks to share the same args + * of the operations... + */ + bi->bi_operational = over_aux_operational; + bi->bi_chk_referrals = over_aux_chk_referrals; + bi->bi_chk_controls = over_aux_chk_controls; + + /* these have specific arglists */ + bi->bi_entry_get_rw = over_entry_get_rw; + bi->bi_entry_release_rw = over_entry_release_rw; + bi->bi_access_allowed = over_access_allowed; + bi->bi_acl_group = over_acl_group; + bi->bi_acl_attribute = over_acl_attribute; + + bi->bi_connection_init = over_connection_init; + bi->bi_connection_destroy = over_connection_destroy; + + be->bd_info = bi; + + } else { + if ( overlay_is_inst( be, ov ) ) { + if ( SLAPO_SINGLE( be ) ) { + Debug( LDAP_DEBUG_ANY, "overlay_config(): " + "overlay \"%s\" already in list\n", + ov, 0, 0 ); + return 1; + } + } + + oi = be->bd_info->bi_private; + } + + /* Insert new overlay into list. By default overlays are + * added to head of list and executed in LIFO order. + */ + on2 = ch_calloc( 1, sizeof(slap_overinst) ); + *on2 = *on; + on2->on_info = oi; + + prev = &oi->oi_list; + /* Do we need to find the insertion point? */ + if ( idx >= 0 ) { + int i; + + /* count current overlays */ + for ( i=0, on=oi->oi_list; on; on=on->on_next, i++ ); + + /* are we just appending a new one? */ + if ( idx >= i ) + idx = -1; + } + overlay_insert( be, on2, &prev, idx ); + + /* Any initialization needed? */ + if ( on2->on_bi.bi_db_init ) { + int rc; + be->bd_info = (BackendInfo *)on2; + rc = on2->on_bi.bi_db_init( be, cr); + be->bd_info = (BackendInfo *)oi; + if ( rc ) { + *prev = on2->on_next; + ch_free( on2 ); + on2 = NULL; + return rc; + } + } + + if ( res ) + *res = &on2->on_bi; + + return 0; +} + |