Adding upstream version 2.4.57+dfsg.upstream/2.4.57+dfsgupstream

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

1 files changed, 162 insertions, 0 deletions

diff --git a/servers/slapd/cancel.c b/servers/slapd/cancel.c
new file mode 100644
index 0000000..22b5232
--- /dev/null
+++ b/servers/slapd/cancel.c
@@ -0,0 +1,162 @@
+/* cancel.c - LDAP cancel extended operation */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2021 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>.
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+
+#include <ac/socket.h>
+#include <ac/string.h>
+#include <ac/unistd.h>
+
+#include "slap.h"
+
+#include <lber_pvt.h>
+#include <lutil.h>
+
+const struct berval slap_EXOP_CANCEL = BER_BVC(LDAP_EXOP_CANCEL);
+
+int cancel_extop( Operation *op, SlapReply *rs )
+{
+	Operation *o;
+	int rc;
+	int opid;
+	BerElementBuffer berbuf;
+	BerElement *ber = (BerElement *)&berbuf;
+
+	assert( ber_bvcmp( &slap_EXOP_CANCEL, &op->ore_reqoid ) == 0 );
+
+	if ( op->ore_reqdata == NULL ) {
+		rs->sr_text = "no message ID supplied";
+		return LDAP_PROTOCOL_ERROR;
+	}
+
+	if ( op->ore_reqdata->bv_len == 0 ) {
+		rs->sr_text = "empty request data field";
+		return LDAP_PROTOCOL_ERROR;
+	}
+
+	/* ber_init2 uses reqdata directly, doesn't allocate new buffers */
+	ber_init2( ber, op->ore_reqdata, 0 );
+
+	if ( ber_scanf( ber, "{i}", &opid ) == LBER_ERROR ) {
+		rs->sr_text = "message ID parse failed";
+		return LDAP_PROTOCOL_ERROR;
+	}
+
+	Statslog( LDAP_DEBUG_STATS, "%s CANCEL msg=%d\n",
+		op->o_log_prefix, opid, 0, 0, 0 );
+
+	if ( opid < 0 ) {
+		rs->sr_text = "message ID invalid";
+		return LDAP_PROTOCOL_ERROR;
+	}
+
+	if ( opid == op->o_msgid ) {
+		op->o_cancel = SLAP_CANCEL_DONE;
+		return LDAP_SUCCESS;
+	}
+
+	ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
+
+	if ( op->o_abandon ) {
+		/* FIXME: Should instead reject the cancel/abandon of this op, but
+		 * it seems unsafe to reset op->o_abandon once it is set. ITS#6138.
+		 */
+		rc = LDAP_OPERATIONS_ERROR;
+		rs->sr_text = "tried to abandon or cancel this operation";
+		goto out;
+	}
+
+	LDAP_STAILQ_FOREACH( o, &op->o_conn->c_pending_ops, o_next ) {
+		if ( o->o_msgid == opid ) {
+			/* TODO: We could instead remove the cancelled operation
+			 * from c_pending_ops like Abandon does, and send its
+			 * response here.  Not if it is pending because of a
+			 * congested connection though.
+			 */
+			rc = LDAP_CANNOT_CANCEL;
+			rs->sr_text = "too busy for Cancel, try Abandon instead";
+			goto out;
+		}
+	}
+
+	LDAP_STAILQ_FOREACH( o, &op->o_conn->c_ops, o_next ) {
+		if ( o->o_msgid == opid ) {
+			break;
+		}
+	}
+
+	if ( o == NULL ) {
+	 	rc = LDAP_NO_SUCH_OPERATION;
+		rs->sr_text = "message ID not found";
+
+	} else if ( o->o_tag == LDAP_REQ_BIND
+			|| o->o_tag == LDAP_REQ_UNBIND
+			|| o->o_tag == LDAP_REQ_ABANDON ) {
+		rc = LDAP_CANNOT_CANCEL;
+
+	} else if ( o->o_cancel != SLAP_CANCEL_NONE ) {
+		rc = LDAP_OPERATIONS_ERROR;
+		rs->sr_text = "message ID already being cancelled";
+
+#if 0
+	} else if ( o->o_abandon ) {
+		/* TODO: Would this break something when
+		 * o_abandon="suppress response"? (ITS#6138)
+		 */
+		rc = LDAP_TOO_LATE;
+#endif
+
+	} else {
+		rc = LDAP_SUCCESS;
+		o->o_cancel = SLAP_CANCEL_REQ;
+		o->o_abandon = 1;
+	}
+
+ out:
+	ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
+
+	if ( rc == LDAP_SUCCESS ) {
+		LDAP_STAILQ_FOREACH( op->o_bd, &backendDB, be_next ) {
+			if( !op->o_bd->be_cancel ) continue;
+
+			op->oq_cancel.rs_msgid = opid;
+			if ( op->o_bd->be_cancel( op, rs ) == LDAP_SUCCESS ) {
+				return LDAP_SUCCESS;
+			}
+		}
+
+		do {
+			/* Fake a cond_wait with thread_yield, then
+			 * verify the result properly mutex-protected.
+			 */
+			while ( o->o_cancel == SLAP_CANCEL_REQ )
+				ldap_pvt_thread_yield();
+			ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
+			rc = o->o_cancel;
+			ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
+		} while ( rc == SLAP_CANCEL_REQ );
+
+		if ( rc == SLAP_CANCEL_ACK ) {
+			rc = LDAP_SUCCESS;
+		}
+
+		o->o_cancel = SLAP_CANCEL_DONE;
+	}
+
+	return rc;
+}