/* $NetBSD: nops.c,v 1.1.1.6.6.1 2019/08/10 06:17:09 martin Exp $ */ /* nops.c - Overlay to filter idempotent operations */ /* $OpenLDAP$ */ /* This work is part of OpenLDAP Software . * * Copyright 2008-2019 The OpenLDAP Foundation. * Copyright 2008 Emmanuel Dreyfus. * 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 * . */ /* ACKNOWLEDGEMENTS: * This work was originally developed by the Emmanuel Dreyfus for * inclusion in OpenLDAP Software. */ #include __RCSID("$NetBSD: nops.c,v 1.1.1.6.6.1 2019/08/10 06:17:09 martin Exp $"); #include "portable.h" #ifdef SLAPD_OVER_NOPS #include #include #include #include "lutil.h" #include "slap.h" #include "config.h" static ConfigDriver nops_cf_gen; static int nops_cf_gen( ConfigArgs *c ) { return 0; } static void nops_rm_mod( Modifications **mods, Modifications *mod ) { Modifications *next, *m; next = mod->sml_next; if (*mods == mod) { *mods = next; } else { Modifications *m; for (m = *mods; m; m = m->sml_next) { if (m->sml_next == mod) { m->sml_next = next; break; } } } mod->sml_next = NULL; slap_mods_free(mod, 1); return; } static int nops_modify( Operation *op, SlapReply *rs ) { slap_overinst *on = (slap_overinst *) op->o_bd->bd_info; Backend *be = op->o_bd; Entry *target_entry = NULL; Modifications *m; int rc; if ((m = op->orm_modlist) == NULL) { op->o_bd->bd_info = (BackendInfo *)(on->on_info); send_ldap_error(op, rs, LDAP_INVALID_SYNTAX, "nops() got null orm_modlist"); return(rs->sr_err); } op->o_bd = on->on_info->oi_origdb; rc = be_entry_get_rw(op, &op->o_req_ndn, NULL, NULL, 0, &target_entry); op->o_bd = be; if (rc != 0 || target_entry == NULL) return 0; /* * For each attribute modification, check if the * modification and the old entry are the same. */ while (m) { int i, j; int found; Attribute *a; BerVarray bm; BerVarray bt; Modifications *mc; mc = m; m = m->sml_next; /* Check only replace sub-operations */ if ((mc->sml_op & LDAP_MOD_OP) != LDAP_MOD_REPLACE) continue; /* If there is no values, skip */ if (((bm = mc->sml_values ) == NULL ) || (bm[0].bv_val == NULL)) continue; /* If the attribute does not exist in old entry, skip */ if ((a = attr_find(target_entry->e_attrs, mc->sml_desc)) == NULL) continue; if ((bt = a->a_vals) == NULL) continue; /* For each value replaced, do we find it in old entry? */ found = 0; for (i = 0; bm[i].bv_val; i++) { for (j = 0; bt[j].bv_val; j++) { if (bm[i].bv_len != bt[j].bv_len) continue; if (memcmp(bm[i].bv_val, bt[j].bv_val, bt[j].bv_len) != 0) continue; found++; break; } } /* Did we find as many values as we had in old entry? */ if (i != a->a_numvals || found != a->a_numvals) continue; /* This is a nop, remove it */ Debug(LDAP_DEBUG_TRACE, "removing nop on %s%s%s", a->a_desc->ad_cname.bv_val, "", ""); nops_rm_mod(&op->orm_modlist, mc); } if (target_entry) { op->o_bd = on->on_info->oi_origdb; be_entry_release_r(op, target_entry); op->o_bd = be; } if ((m = op->orm_modlist) == NULL) { slap_callback *cb = op->o_callback; op->o_bd->bd_info = (BackendInfo *)(on->on_info); op->o_callback = NULL; send_ldap_error(op, rs, LDAP_SUCCESS, ""); op->o_callback = cb; return (rs->sr_err); } return SLAP_CB_CONTINUE; } static slap_overinst nops_ovl; #if SLAPD_OVER_NOPS == SLAPD_MOD_DYNAMIC static #endif int nops_initialize( void ) { nops_ovl.on_bi.bi_type = "nops"; nops_ovl.on_bi.bi_op_modify = nops_modify; return overlay_register( &nops_ovl ); } #if SLAPD_OVER_NOPS == SLAPD_MOD_DYNAMIC int init_module(int argc, char *argv[]) { return nops_initialize(); } #endif #endif /* defined(SLAPD_OVER_NOPS) */