Adding upstream version 2.5.13+dfsg.upstream/2.5.13+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 330 insertions, 0 deletions

diff --git a/contrib/slapd-modules/usn/usn.c b/contrib/slapd-modules/usn/usn.c
new file mode 100644
index 0000000..abd6d13
--- /dev/null
+++ b/contrib/slapd-modules/usn/usn.c
@@ -0,0 +1,330 @@
+/* usn.c - Maintain Microsoft-style Update Sequence Numbers */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 2007-2022 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>.
+ */
+/* ACKNOWLEDGEMENTS:
+ * This work was initially developed by Howard Chu for inclusion in
+ * OpenLDAP Software.
+ */
+
+#include "portable.h"
+
+#ifdef SLAPD_OVER_USN
+
+#include <stdio.h>
+
+#include <ac/string.h>
+#include <ac/socket.h>
+
+#include "slap.h"
+#include "slap-config.h"
+
+/* This overlay intercepts write operations and adds a Microsoft-style
+ * USN to the target entry.
+ */
+
+typedef struct usn_info {
+	int ui_current;
+	ldap_pvt_thread_mutex_t ui_mutex;
+} usn_info_t;
+
+static AttributeDescription *ad_usnCreated, *ad_usnChanged;
+
+static struct {
+	char *desc;
+	AttributeDescription **adp;
+} as[] = {
+	{ "( 1.2.840.113556.1.2.19 "
+	    "NAME 'uSNCreated' "
+	    "SYNTAX '1.2.840.113556.1.4.906' "
+		"SINGLE-VALUE "
+		"NO-USER-MODIFICATION )",
+		&ad_usnCreated },
+	{ "( 1.2.840.113556.1.2.120 "
+		"NAME 'uSNChanged' "
+		"SYNTAX '1.2.840.113556.1.4.906' "
+		"SINGLE-VALUE "
+		"NO-USER-MODIFICATION )",
+		&ad_usnChanged },
+	{ NULL }
+};
+
+static int
+usn_func( Operation *op, SlapReply *rs )
+{
+	slap_overinst		*on = (slap_overinst *) op->o_bd->bd_info;
+	usn_info_t		*ui = on->on_bi.bi_private;
+	int my_usn;
+	char intbuf[64];
+	struct berval bv[2];
+
+	ldap_pvt_thread_mutex_lock( &ui->ui_mutex );
+	ui->ui_current++;
+	my_usn = ui->ui_current;
+	ldap_pvt_thread_mutex_unlock( &ui->ui_mutex );
+
+	BER_BVZERO(&bv[1]);
+	bv[0].bv_val = intbuf;
+	bv[0].bv_len = snprintf( intbuf, sizeof(intbuf), "%d", my_usn );
+	switch(op->o_tag) {
+	case LDAP_REQ_ADD:
+		attr_merge( op->ora_e, ad_usnCreated, bv, NULL );
+		attr_merge( op->ora_e, ad_usnChanged, bv, NULL );
+		break;
+	case LDAP_REQ_DELETE:
+		/* Probably need to update root usnLastObjRem */
+		break;
+	default: {
+		/* Modify, ModDN */
+		Modifications *ml, *mod = ch_calloc( sizeof( Modifications ), 1 );
+		for ( ml = op->orm_modlist; ml && ml->sml_next; ml = ml->sml_next );
+		ml->sml_next = mod;
+		mod->sml_desc = ad_usnChanged;
+		mod->sml_numvals = 1;
+		value_add_one( &mod->sml_values, &bv[0] );
+		mod->sml_nvalues = NULL;
+		mod->sml_op = LDAP_MOD_REPLACE;
+		mod->sml_flags = 0;
+		mod->sml_next = NULL;
+		break;
+		}
+	}
+	return SLAP_CB_CONTINUE;
+}
+
+static int
+usn_operational(
+	Operation *op,
+	SlapReply *rs )
+{
+	slap_overinst		*on = (slap_overinst *)op->o_bd->bd_info;
+	usn_info_t		*ui = (usn_info_t *)on->on_bi.bi_private;
+
+	if ( rs->sr_entry &&
+		dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
+
+		if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
+			ad_inlist( ad_usnChanged, rs->sr_attrs )) {
+			Attribute *a, **ap = NULL;
+			char intbuf[64];
+			struct berval bv;
+			int my_usn;
+
+			for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
+				if ( a->a_desc == ad_usnChanged )
+					break;
+			}
+
+			if ( !a ) {
+				for ( ap = &rs->sr_operational_attrs; *ap;
+					ap=&(*ap)->a_next );
+
+					a = attr_alloc( ad_usnChanged );
+					*ap = a;
+				}
+
+			if ( !ap ) {
+				if ( rs_entry2modifiable( op,rs, on )) {
+					a = attr_find( rs->sr_entry->e_attrs,
+						ad_usnChanged );
+				}
+				ber_bvarray_free( a->a_vals );
+				a->a_vals = NULL;
+				a->a_numvals = 0;
+			}
+			ldap_pvt_thread_mutex_lock( &ui->ui_mutex );
+			my_usn = ui->ui_current;
+			ldap_pvt_thread_mutex_unlock( &ui->ui_mutex );
+			bv.bv_len = snprintf( intbuf, sizeof(intbuf), "%d", my_usn );
+			bv.bv_val = intbuf;
+			attr_valadd( a, &bv, NULL, 1 );
+		}
+	}
+	return SLAP_CB_CONTINUE;
+}
+
+/* Read the old USN from the underlying DB. This code is
+ * stolen from the syncprov overlay.
+ */
+static int
+usn_db_open(
+	BackendDB *be,
+	ConfigReply *cr)
+{
+	slap_overinst   *on = (slap_overinst *) be->bd_info;
+	usn_info_t *ui = (usn_info_t *)on->on_bi.bi_private;
+
+	Connection conn = { 0 };
+	OperationBuffer opbuf;
+	Operation *op;
+	Entry *e = NULL;
+	Attribute *a;
+	int rc;
+	void *thrctx = NULL;
+
+	thrctx = ldap_pvt_thread_pool_context();
+	connection_fake_init( &conn, &opbuf, thrctx );
+	op = &opbuf.ob_op;
+	op->o_bd = be;
+	op->o_dn = be->be_rootdn;
+	op->o_ndn = be->be_rootndn;
+
+	rc = overlay_entry_get_ov( op, be->be_nsuffix, NULL,
+		slap_schema.si_ad_contextCSN, 0, &e, on );
+
+	if ( e ) {
+		a = attr_find( e->e_attrs, ad_usnChanged );
+		if ( a ) {
+			ui->ui_current = atoi( a->a_vals[0].bv_val );
+		}
+		overlay_entry_release_ov( op, e, 0, on );
+	}
+	return 0;
+}
+
+static int
+usn_db_init(
+	BackendDB *be,
+	ConfigReply *cr
+)
+{
+	slap_overinst	*on = (slap_overinst *)be->bd_info;
+	usn_info_t	*ui;
+
+	if ( SLAP_ISGLOBALOVERLAY( be ) ) {
+		Debug( LDAP_DEBUG_ANY,
+			"usn must be instantiated within a database.\n" );
+		return 1;
+	}
+
+	ui = ch_calloc(1, sizeof(usn_info_t));
+	ldap_pvt_thread_mutex_init( &ui->ui_mutex );
+	on->on_bi.bi_private = ui;
+	return 0;
+}
+
+static int
+usn_db_close(
+	BackendDB *be,
+	ConfigReply *cr
+)
+{
+	slap_overinst	*on = (slap_overinst *)be->bd_info;
+	usn_info_t	*ui = on->on_bi.bi_private;
+	Connection conn = {0};
+	OperationBuffer opbuf;
+	Operation *op;
+	SlapReply rs = {REP_RESULT};
+	void *thrctx;
+
+	Modifications mod;
+	slap_callback cb = {0};
+	char intbuf[64];
+	struct berval bv[2];
+
+	thrctx = ldap_pvt_thread_pool_context();
+	connection_fake_init( &conn, &opbuf, thrctx );
+	op = &opbuf.ob_op;
+	op->o_bd = be;
+	BER_BVZERO( &bv[1] );
+	bv[0].bv_len = snprintf( intbuf, sizeof(intbuf), "%d", ui->ui_current );
+	bv[0].bv_val = intbuf;
+	mod.sml_numvals = 1;
+	mod.sml_values = bv;
+	mod.sml_nvalues = NULL;
+	mod.sml_desc = ad_usnChanged;
+	mod.sml_op = LDAP_MOD_REPLACE;
+	mod.sml_flags = 0;
+	mod.sml_next = NULL;
+
+	cb.sc_response = slap_null_cb;
+	op->o_tag = LDAP_REQ_MODIFY;
+	op->o_callback = &cb;
+	op->orm_modlist = &mod;
+	op->orm_no_opattrs = 1;
+	op->o_dn = be->be_rootdn;
+	op->o_ndn = be->be_rootndn;
+	op->o_req_dn = op->o_bd->be_suffix[0];
+	op->o_req_ndn = op->o_bd->be_nsuffix[0];
+	op->o_bd->bd_info = on->on_info->oi_orig;
+	op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
+	op->o_no_schema_check = 1;
+	op->o_bd->be_modify( op, &rs );
+	if ( mod.sml_next != NULL ) {
+		slap_mods_free( mod.sml_next, 1 );
+	}
+	return 0;
+}
+
+static int
+usn_db_destroy(
+	BackendDB *be,
+	ConfigReply *cr
+)
+{
+	slap_overinst	*on = (slap_overinst *)be->bd_info;
+	usn_info_t	*ui = on->on_bi.bi_private;
+
+	ldap_pvt_thread_mutex_destroy( &ui->ui_mutex );
+	ch_free( ui );
+	on->on_bi.bi_private = NULL;
+	return 0;
+}
+
+/* This overlay is set up for dynamic loading via moduleload. For static
+ * configuration, you'll need to arrange for the slap_overinst to be
+ * initialized and registered by some other function inside slapd.
+ */
+
+static slap_overinst usn;
+
+int
+usn_init( void )
+{
+	int i, code;
+
+	memset( &usn, 0, sizeof( slap_overinst ) );
+	usn.on_bi.bi_type = "usn";
+	usn.on_bi.bi_flags = SLAPO_BFLAG_SINGLE;
+	usn.on_bi.bi_db_init = usn_db_init;
+	usn.on_bi.bi_db_destroy = usn_db_destroy;
+	usn.on_bi.bi_db_open = usn_db_open;
+	usn.on_bi.bi_db_close = usn_db_close;
+
+	usn.on_bi.bi_op_modify = usn_func;
+	usn.on_bi.bi_op_modrdn = usn_func;
+	usn.on_bi.bi_op_add = usn_func;
+	usn.on_bi.bi_op_delete = usn_func;
+	usn.on_bi.bi_operational = usn_operational;
+
+	for ( i = 0; as[i].desc; i++ ) {
+		code = register_at( as[i].desc, as[i].adp, 0 );
+		if ( code ) {
+			Debug( LDAP_DEBUG_ANY,
+				"usn_init: register_at #%d failed\n", i );
+			return code;
+		}
+	}
+	return overlay_register( &usn );
+}
+
+#if SLAPD_OVER_USN == SLAPD_MOD_DYNAMIC
+int
+init_module( int argc, char *argv[] )
+{
+	return usn_init();
+}
+#endif /* SLAPD_OVER_USN == SLAPD_MOD_DYNAMIC */
+
+#endif /* defined(SLAPD_OVER_USN) */