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-rw-r--r--libraries/libldap/psearchctrl.c348
1 files changed, 348 insertions, 0 deletions
diff --git a/libraries/libldap/psearchctrl.c b/libraries/libldap/psearchctrl.c
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+++ b/libraries/libldap/psearchctrl.c
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+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2022 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 developed by Howard Chu for inclusion in
+ * OpenLDAP Software.
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+#include <ac/stdlib.h>
+#include <ac/string.h>
+#include <ac/time.h>
+
+#include "ldap-int.h"
+
+/* Based on draft-ietf-ldapext-c-api-psearch-00 */
+
+/* ---------------------------------------------------------------------------
+ ldap_create_persistentsearch_control_value
+
+ Create and encode the value of the server-side sort control.
+
+ ld (IN) An LDAP session handle, as obtained from a call to
+ ldap_init().
+
+ changetypes (IN) A bit-sensitive field that indicates which kinds of
+ changes the client wants to be informed about. Its
+ value should be LDAP_CHANGETYPE_ANY, or any logical-OR
+ combination of LDAP_CHANGETYPE_ADD,
+ LDAP_CHANGETYPE_DELETE, LDAP_CHANGETYPE_MODIFY, and
+ LDAP_CHANGETYPE_MODDN. This field corresponds to the
+ changeType element of the BER-encoded PersistentSearch
+ control value itself.
+
+ changesonly (IN) A Boolean field that indicates whether the client
+ wishes to only receive searchResultEntry messages for
+ entries that have been changed. If non-zero, only
+ entries that result from changes are returned; other-
+ wise, all of the static entries that match the search
+ criteria are returned before the server begins change
+ notification. This field corresponds to the changes-
+ Only element of the BER-encoded PersistentSearch con-
+ trol value itself.
+
+ return_echg_ctls (IN) A Boolean field that indicates whether the server
+ should send back an Entry Change Notification control
+ with each searchResultEntry that is returned due to a
+ change to an entry. If non-zero, Entry Change
+ Notification controls are requested; if zero, they are
+ not. This field corresponds to the returnECs element
+ of the BER-encoded PersistentSearch control value
+ itself.
+
+ value (OUT) Contains the control value; the bv_val member of the berval structure
+ SHOULD be freed by calling ldap_memfree() when done.
+
+ ---------------------------------------------------------------------------*/
+
+int
+ldap_create_persistentsearch_control_value(
+ LDAP *ld,
+ int changetypes,
+ int changesonly,
+ int return_echg_ctls,
+ struct berval *value )
+{
+ int i;
+ BerElement *ber = NULL;
+ ber_tag_t tag;
+
+ assert( ld != NULL );
+ assert( LDAP_VALID( ld ) );
+
+ if ( ld == NULL ) return LDAP_PARAM_ERROR;
+ if ( value == NULL ) {
+ ld->ld_errno = LDAP_PARAM_ERROR;
+ return LDAP_PARAM_ERROR;
+ }
+ if (( changetypes & 0x0f ) != changetypes ) {
+ ld->ld_errno = LDAP_PARAM_ERROR;
+ return LDAP_PARAM_ERROR;
+ }
+
+ value->bv_val = NULL;
+ value->bv_len = 0;
+ ld->ld_errno = LDAP_SUCCESS;
+
+ ber = ldap_alloc_ber_with_options( ld );
+ if ( ber == NULL) {
+ ld->ld_errno = LDAP_NO_MEMORY;
+ return ld->ld_errno;
+ }
+
+ tag = ber_printf( ber, "{ibb}", changetypes, changesonly, return_echg_ctls );
+ if ( tag == LBER_ERROR ) {
+ goto error_return;
+ }
+
+ if ( ber_flatten2( ber, value, 1 ) == -1 ) {
+ ld->ld_errno = LDAP_NO_MEMORY;
+ }
+
+ if ( 0 ) {
+error_return:;
+ ld->ld_errno = LDAP_ENCODING_ERROR;
+ }
+
+ if ( ber != NULL ) {
+ ber_free( ber, 1 );
+ }
+
+ return ld->ld_errno;
+}
+
+
+/* ---------------------------------------------------------------------------
+ ldap_create_persistentsearch_control
+
+ Create and encode the persistent search control.
+
+ ld (IN) An LDAP session handle, as obtained from a call to
+ ldap_init().
+
+ changetypes (IN) A bit-sensitive field that indicates which kinds of
+ changes the client wants to be informed about. Its
+ value should be LDAP_CHANGETYPE_ANY, or any logical-OR
+ combination of LDAP_CHANGETYPE_ADD,
+ LDAP_CHANGETYPE_DELETE, LDAP_CHANGETYPE_MODIFY, and
+ LDAP_CHANGETYPE_MODDN. This field corresponds to the
+ changeType element of the BER-encoded PersistentSearch
+ control value itself.
+
+ changesonly (IN) A Boolean field that indicates whether the client
+ wishes to only receive searchResultEntry messages for
+ entries that have been changed. If non-zero, only
+ entries that result from changes are returned; other-
+ wise, all of the static entries that match the search
+ criteria are returned before the server begins change
+ notification. This field corresponds to the changes-
+ Only element of the BER-encoded PersistentSearch con-
+ trol value itself.
+
+ return_echg_ctls (IN) A Boolean field that indicates whether the server
+ should send back an Entry Change Notification control
+ with each searchResultEntry that is returned due to a
+ change to an entry. If non-zero, Entry Change
+ Notification controls are requested; if zero, they are
+ not. This field corresponds to the returnECs element
+ of the BER-encoded PersistentSearch control value
+ itself.
+
+ isCritical (IN) 0 - Indicates the control is not critical to the operation.
+ non-zero - The control is critical to the operation.
+
+ ctrlp (OUT) Returns a pointer to the LDAPControl created. This control
+ SHOULD be freed by calling ldap_control_free() when done.
+
+ ---------------------------------------------------------------------------*/
+
+int
+ldap_create_persistentsearch_control(
+ LDAP *ld,
+ int changetypes,
+ int changesonly,
+ int return_echg_ctls,
+ int isCritical,
+ LDAPControl **ctrlp )
+{
+ struct berval value;
+
+ assert( ld != NULL );
+ assert( LDAP_VALID( ld ) );
+
+ if ( ld == NULL ) {
+ return LDAP_PARAM_ERROR;
+ }
+
+ if ( ctrlp == NULL ) {
+ ld->ld_errno = LDAP_PARAM_ERROR;
+ return ld->ld_errno;
+ }
+
+ ld->ld_errno = ldap_create_persistentsearch_control_value( ld, changetypes, changesonly, return_echg_ctls, &value );
+ if ( ld->ld_errno == LDAP_SUCCESS ) {
+ ld->ld_errno = ldap_control_create( LDAP_CONTROL_PERSIST_REQUEST,
+ isCritical, &value, 0, ctrlp );
+ if ( ld->ld_errno != LDAP_SUCCESS ) {
+ LDAP_FREE( value.bv_val );
+ }
+ }
+
+ return ld->ld_errno;
+}
+
+
+/* ---------------------------------------------------------------------------
+ ldap_parse_entrychange_control
+
+ Decode the entry change notification control return information.
+
+ ld (IN) An LDAP session handle, as obtained from a call to
+ ldap_init().
+
+ ctrl (IN) The address of the LDAP Control Structure.
+
+ chgtypep (OUT) This result parameter is filled in with one of the
+ following values to indicate the type of change that was
+ made that caused the entry to be returned:
+ LDAP_CONTROL_PERSIST_ENTRY_CHANGE_ADD (1),
+ LDAP_CONTROL_PERSIST_ENTRY_CHANGE_DELETE (2),
+ LDAP_CONTROL_PERSIST_ENTRY_CHANGE_MODIFY (4), or
+ LDAP_CONTROL_PERSIST_ENTRY_CHANGE_RENAME (8).
+ If this parameter is NULL, the change type information
+ is not returned.
+
+ prevdnp (OUT) This result parameter points to the DN the
+ entry had before it was renamed and/or moved by a
+ modifyDN operation. It is set to NULL for other types
+ of changes. If this parameter is NULL, the previous DN
+ information is not returned. The returned value is a
+ pointer to the contents of the control; it is not a
+ copy of the data.
+
+ chgnumpresentp (OUT) This result parameter is filled in with a non-zero
+ value if a change number was returned in the control
+ (the change number is optional and servers MAY choose
+ not to return it). If this parameter is NULL, no indication
+ of whether the change number was present is returned.
+
+ chgnump (OUT) This result parameter is filled in with the change number
+ if one was returned in the control. If this parameter
+ is NULL, the change number is not returned.
+
+ ---------------------------------------------------------------------------*/
+
+int
+ldap_parse_entrychange_control(
+ LDAP *ld,
+ LDAPControl *ctrl,
+ int *chgtypep,
+ struct berval *prevdnp,
+ int *chgnumpresentp,
+ long *chgnump )
+{
+ BerElement *ber;
+ ber_tag_t tag, berTag;
+ ber_len_t berLen;
+ ber_int_t chgtype;
+
+ assert( ld != NULL );
+ assert( LDAP_VALID( ld ) );
+ assert( ctrl != NULL );
+
+ if (ld == NULL) {
+ return LDAP_PARAM_ERROR;
+ }
+
+ if (ctrl == NULL) {
+ ld->ld_errno = LDAP_PARAM_ERROR;
+ return(ld->ld_errno);
+ }
+
+ if ( !ctrl->ldctl_value.bv_val ) {
+ ld->ld_errno = LDAP_DECODING_ERROR;
+ return(ld->ld_errno);
+ }
+
+ /* Create a BerElement from the berval returned in the control. */
+ ber = ber_init(&ctrl->ldctl_value);
+
+ if (ber == NULL) {
+ ld->ld_errno = LDAP_NO_MEMORY;
+ return(ld->ld_errno);
+ }
+
+ if ( prevdnp != NULL ) {
+ BER_BVZERO( prevdnp );
+ }
+ if ( chgnumpresentp != NULL )
+ *chgnumpresentp = 0;
+ if ( chgnump != NULL )
+ *chgnump = 0;
+
+ /* Extract the change type from the control. */
+ tag = ber_scanf(ber, "{e" /*}*/, &chgtype);
+
+ if( tag != LBER_ENUMERATED ) {
+ ber_free(ber, 1);
+ ld->ld_errno = LDAP_DECODING_ERROR;
+ return(ld->ld_errno);
+ }
+ if ( chgtypep != NULL )
+ *chgtypep = chgtype;
+
+ tag = ber_peek_tag( ber, &berLen );
+ if ( berLen ) {
+ if (tag == LBER_OCTETSTRING) {
+ if (prevdnp != NULL) {
+ tag = ber_get_stringbv( ber, prevdnp, 0 );
+ } else {
+ struct berval bv;
+ tag = ber_skip_element( ber, &bv );
+ }
+ if ( tag == LBER_ERROR ) {
+ ber_free(ber, 1);
+ ld->ld_errno = LDAP_DECODING_ERROR;
+ return(ld->ld_errno);
+ }
+ tag = ber_peek_tag( ber, &berLen );
+ }
+
+ if ( chgnumpresentp != NULL || chgnump != NULL ) {
+ ber_int_t chgnum = 0;
+ int present = 0;
+ if (tag == LBER_INTEGER) {
+ present = 1;
+ tag = ber_get_int( ber, &chgnum );
+ if ( tag == LBER_ERROR ) {
+ ber_free(ber, 1);
+ ld->ld_errno = LDAP_DECODING_ERROR;
+ return(ld->ld_errno);
+ }
+ if ( chgnumpresentp != NULL )
+ *chgnumpresentp = present;
+ if ( chgnump != NULL )
+ *chgnump = chgnum;
+ }
+ }
+ }
+
+ ber_free(ber,1);
+
+ ld->ld_errno = LDAP_SUCCESS;
+ return(ld->ld_errno);
+}
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