diff options
Diffstat (limited to 'servers/slapd/overlays/collect.c')
| -rw-r--r-- | servers/slapd/overlays/collect.c | 440 |
1 files changed, 440 insertions, 0 deletions
diff --git a/servers/slapd/overlays/collect.c b/servers/slapd/overlays/collect.c new file mode 100644 index 0000000..bbc6219 --- /dev/null +++ b/servers/slapd/overlays/collect.c @@ -0,0 +1,440 @@ +/* collect.c - Demonstration of overlay code */ +/* $OpenLDAP$ */ +/* This work is part of OpenLDAP Software <http://www.openldap.org/>. + * + * Copyright 2003-2022 The OpenLDAP Foundation. + * Portions Copyright 2003 Howard Chu. + * 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>. + */ +/* ACKNOWLEDGEMENTS: + * This work was initially developed by the Howard Chu for inclusion + * in OpenLDAP Software. + */ + +#include "portable.h" + +#ifdef SLAPD_OVER_COLLECT + +#include <stdio.h> + +#include <ac/string.h> +#include <ac/socket.h> + +#include "slap.h" +#include "slap-config.h" + +#include "lutil.h" + +/* This is a cheap hack to implement a collective attribute. + * + * This demonstration overlay looks for a specified attribute in an + * ancestor of a given entry and adds that attribute to the given + * entry when it is returned in a search response. It takes no effect + * for any other operations. If the ancestor does not exist, there + * is no effect. If no attribute was configured, there is no effect. + */ + +typedef struct collect_info { + struct collect_info *ci_next; + struct berval ci_dn; + int ci_ad_num; + AttributeDescription *ci_ad[1]; +} collect_info; + +static int collect_cf( ConfigArgs *c ); + +static ConfigTable collectcfg[] = { + { "collectinfo", "dn> <attribute", 3, 3, 0, + ARG_MAGIC, collect_cf, + "( OLcfgOvAt:19.1 NAME 'olcCollectInfo' " + "DESC 'DN of entry and attribute to distribute' " + "EQUALITY caseIgnoreMatch " + "SYNTAX OMsDirectoryString )", NULL, NULL }, + { NULL, NULL, 0, 0, 0, ARG_IGNORED } +}; + +static ConfigOCs collectocs[] = { + { "( OLcfgOvOc:19.1 " + "NAME 'olcCollectConfig' " + "DESC 'Collective Attribute configuration' " + "SUP olcOverlayConfig " + "MAY olcCollectInfo )", + Cft_Overlay, collectcfg }, + { NULL, 0, NULL } +}; + +/* + * inserts a collect_info into on->on_bi.bi_private taking into account + * order. this means longer dn's (i.e. more specific dn's) will be found + * first when searching, allowing some limited overlap of dn's + */ +static void +insert_ordered( slap_overinst *on, collect_info *ci ) { + collect_info *find = on->on_bi.bi_private; + collect_info *prev = NULL; + int found = 0; + + while (!found) { + if (find == NULL) { + if (prev == NULL) { + /* base case - empty list */ + on->on_bi.bi_private = ci; + ci->ci_next = NULL; + } else { + /* final case - end of list */ + prev->ci_next = ci; + ci->ci_next = NULL; + } + found = 1; + } else if (find->ci_dn.bv_len < ci->ci_dn.bv_len) { + /* insert into list here */ + if (prev == NULL) { + /* entry is head of list */ + ci->ci_next = on->on_bi.bi_private; + on->on_bi.bi_private = ci; + } else { + /* entry is not head of list */ + prev->ci_next = ci; + ci->ci_next = find; + } + found = 1; + } else { + /* keep looking */ + prev = find; + find = find->ci_next; + } + } +} + +static int +collect_cf( ConfigArgs *c ) +{ + slap_overinst *on = (slap_overinst *)c->bi; + int rc = 1, idx; + + switch( c->op ) { + case SLAP_CONFIG_EMIT: + { + collect_info *ci; + for ( ci = on->on_bi.bi_private; ci; ci = ci->ci_next ) { + struct berval bv; + char *ptr; + int len; + + /* calculate the length & malloc memory */ + bv.bv_len = ci->ci_dn.bv_len + STRLENOF("\"\" "); + for (idx=0; idx<ci->ci_ad_num; idx++) { + bv.bv_len += ci->ci_ad[idx]->ad_cname.bv_len; + if (idx<(ci->ci_ad_num-1)) { + bv.bv_len++; + } + } + bv.bv_val = ch_malloc( bv.bv_len + 1 ); + + /* copy the value and update len */ + len = snprintf( bv.bv_val, bv.bv_len + 1, "\"%s\" ", + ci->ci_dn.bv_val); + ptr = bv.bv_val + len; + for (idx=0; idx<ci->ci_ad_num; idx++) { + ptr = lutil_strncopy( ptr, + ci->ci_ad[idx]->ad_cname.bv_val, + ci->ci_ad[idx]->ad_cname.bv_len); + if (idx<(ci->ci_ad_num-1)) { + *ptr++ = ','; + } + } + *ptr = '\0'; + bv.bv_len = ptr - bv.bv_val; + + ber_bvarray_add( &c->rvalue_vals, &bv ); + rc = 0; + } + } + break; + case LDAP_MOD_DELETE: + if ( c->valx == -1 ) { + /* Delete entire attribute */ + collect_info *ci; + while (( ci = on->on_bi.bi_private )) { + on->on_bi.bi_private = ci->ci_next; + ch_free( ci->ci_dn.bv_val ); + ch_free( ci ); + } + } else { + /* Delete just one value */ + collect_info **cip, *ci; + int i; + cip = (collect_info **)&on->on_bi.bi_private; + ci = *cip; + for ( i=0; i < c->valx; i++ ) { + cip = &ci->ci_next; + ci = *cip; + } + *cip = ci->ci_next; + ch_free( ci->ci_dn.bv_val ); + ch_free( ci ); + } + rc = 0; + break; + case SLAP_CONFIG_ADD: + case LDAP_MOD_ADD: + { + collect_info *ci; + struct berval bv, dn; + const char *text; + int idx, count=0; + char *arg; + + /* count delimiters in attribute argument */ + arg = strtok(c->argv[2], ","); + while (arg!=NULL) { + count++; + arg = strtok(NULL, ","); + } + + /* validate and normalize dn */ + ber_str2bv( c->argv[1], 0, 0, &bv ); + if ( dnNormalize( 0, NULL, NULL, &bv, &dn, NULL ) ) { + snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid DN: \"%s\"", + c->argv[0], c->argv[1] ); + Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE, + "%s: %s\n", c->log, c->cr_msg ); + return ARG_BAD_CONF; + } + + /* check for duplicate DNs */ + for ( ci = (collect_info *)on->on_bi.bi_private; ci; + ci = ci->ci_next ) { + /* If new DN is longest, there are no possible matches */ + if ( dn.bv_len > ci->ci_dn.bv_len ) { + ci = NULL; + break; + } + if ( bvmatch( &dn, &ci->ci_dn )) { + break; + } + } + if ( ci ) { + snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s DN already configured: \"%s\"", + c->argv[0], c->argv[1] ); + Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE, + "%s: %s\n", c->log, c->cr_msg ); + return ARG_BAD_CONF; + } + + /* allocate config info with room for attribute array */ + ci = ch_malloc( sizeof( collect_info ) + + sizeof( AttributeDescription * ) * count ); + + /* load attribute description for attribute list */ + arg = c->argv[2]; + for( idx=0; idx<count; idx++) { + ci->ci_ad[idx] = NULL; + + if ( slap_str2ad( arg, &ci->ci_ad[idx], &text ) ) { + snprintf( c->cr_msg, sizeof( c->cr_msg ), + "%s attribute description unknown: \"%s\"", + c->argv[0], arg); + Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE, + "%s: %s\n", c->log, c->cr_msg ); + ch_free( ci ); + return ARG_BAD_CONF; + } + while(*arg!='\0') { + arg++; /* skip to end of argument */ + } + if (idx<count-1) { + arg++; /* skip inner delimiters */ + } + } + + /* The on->on_bi.bi_private pointer can be used for + * anything this instance of the overlay needs. + */ + ci->ci_ad[count] = NULL; + ci->ci_ad_num = count; + ci->ci_dn = dn; + + /* creates list of ci's ordered by dn length */ + insert_ordered ( on, ci ); + + /* New ci wasn't simply appended to end, adjust its + * position in the config entry's a_vals + */ + if ( c->ca_entry && ci->ci_next ) { + Attribute *a = attr_find( c->ca_entry->e_attrs, + collectcfg[0].ad ); + if ( a ) { + struct berval bv, nbv; + collect_info *c2 = (collect_info *)on->on_bi.bi_private; + int i, j; + for ( i=0; c2 != ci; i++, c2 = c2->ci_next ); + bv = a->a_vals[a->a_numvals-1]; + nbv = a->a_nvals[a->a_numvals-1]; + for ( j=a->a_numvals-1; j>i; j-- ) { + a->a_vals[j] = a->a_vals[j-1]; + a->a_nvals[j] = a->a_nvals[j-1]; + } + a->a_vals[j] = bv; + a->a_nvals[j] = nbv; + } + } + + rc = 0; + } + } + return rc; +} + +static int +collect_destroy( + BackendDB *be, + ConfigReply *cr +) +{ + slap_overinst *on = (slap_overinst *)be->bd_info; + collect_info *ci; + + while (( ci = on->on_bi.bi_private )) { + on->on_bi.bi_private = ci->ci_next; + ch_free( ci->ci_dn.bv_val ); + ch_free( ci ); + } + return 0; +} + +static int +collect_modify( Operation *op, SlapReply *rs) +{ + slap_overinst *on = (slap_overinst *) op->o_bd->bd_info; + collect_info *ci = on->on_bi.bi_private; + Modifications *ml; + char errMsg[100]; + int idx; + + for ( ml = op->orm_modlist; ml != NULL; ml = ml->sml_next) { + for (; ci; ci=ci->ci_next ) { + /* Is this entry an ancestor of this collectinfo ? */ + if (!dnIsSuffix(&op->o_req_ndn, &ci->ci_dn)) { + /* this collectinfo does not match */ + continue; + } + + /* Is this entry the same as the template DN ? */ + if ( dn_match(&op->o_req_ndn, &ci->ci_dn)) { + /* all changes in this ci are allowed */ + continue; + } + + /* check for collect attributes - disallow modify if present */ + for(idx=0; idx<ci->ci_ad_num; idx++) { + if (ml->sml_desc == ci->ci_ad[idx]) { + rs->sr_err = LDAP_UNWILLING_TO_PERFORM; + snprintf( errMsg, sizeof( errMsg ), + "cannot change virtual attribute '%s'", + ci->ci_ad[idx]->ad_cname.bv_val); + rs->sr_text = errMsg; + send_ldap_result( op, rs ); + return rs->sr_err; + } + } + } + + } + + return SLAP_CB_CONTINUE; +} + +static int +collect_response( Operation *op, SlapReply *rs ) +{ + slap_overinst *on = (slap_overinst *) op->o_bd->bd_info; + collect_info *ci = on->on_bi.bi_private; + + /* If we've been configured and the current response is + * a search entry + */ + if ( ci && rs->sr_type == REP_SEARCH ) { + int rc; + + op->o_bd->bd_info = (BackendInfo *)on->on_info; + + for (; ci; ci=ci->ci_next ) { + int idx=0; + + /* Is this entry an ancestor of this collectinfo ? */ + if (!dnIsSuffix(&rs->sr_entry->e_nname, &ci->ci_dn)) { + /* collectinfo does not match */ + continue; + } + + /* Is this entry the same as the template DN ? */ + if ( dn_match(&rs->sr_entry->e_nname, &ci->ci_dn)) { + /* dont apply change to parent */ + continue; + } + + /* The current entry may live in a cache, so + * don't modify it directly. Make a copy and + * work with that instead. + */ + rs_entry2modifiable( op, rs, on ); + + /* Loop for each attribute in this collectinfo */ + for(idx=0; idx<ci->ci_ad_num; idx++) { + BerVarray vals = NULL; + + /* Extract the values of the desired attribute from + * the ancestor entry */ + rc = backend_attribute( op, NULL, &ci->ci_dn, + ci->ci_ad[idx], &vals, ACL_READ ); + + /* If there are any values, merge them into the + * current search result + */ + if ( vals ) { + attr_merge_normalize( rs->sr_entry, ci->ci_ad[idx], + vals, op->o_tmpmemctx ); + ber_bvarray_free_x( vals, op->o_tmpmemctx ); + } + } + } + } + + /* Default is to just fall through to the normal processing */ + return SLAP_CB_CONTINUE; +} + +static slap_overinst collect; + +int collect_initialize() { + int code; + + collect.on_bi.bi_type = "collect"; + collect.on_bi.bi_flags = SLAPO_BFLAG_SINGLE; + collect.on_bi.bi_db_destroy = collect_destroy; + collect.on_bi.bi_op_modify = collect_modify; + collect.on_response = collect_response; + + collect.on_bi.bi_cf_ocs = collectocs; + code = config_register_schema( collectcfg, collectocs ); + if ( code ) return code; + + return overlay_register( &collect ); +} + +#if SLAPD_OVER_COLLECT == SLAPD_MOD_DYNAMIC +int init_module(int argc, char *argv[]) { + return collect_initialize(); +} +#endif + +#endif /* SLAPD_OVER_COLLECT */ |