1 files changed, 130 insertions, 0 deletions
diff --git a/lib/ns/listenlist.c b/lib/ns/listenlist.c
new file mode 100644
index 0000000..9fb3674
--- /dev/null
+++ b/lib/ns/listenlist.c
@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#include <stdbool.h>
+
+#include <isc/mem.h>
+#include <isc/util.h>
+
+#include <dns/acl.h>
+
+#include <ns/listenlist.h>
+
+static void
+destroy(ns_listenlist_t *list);
+
+isc_result_t
+ns_listenelt_create(isc_mem_t *mctx, in_port_t port, isc_dscp_t dscp,
+		    dns_acl_t *acl, ns_listenelt_t **target) {
+	ns_listenelt_t *elt = NULL;
+	REQUIRE(target != NULL && *target == NULL);
+	elt = isc_mem_get(mctx, sizeof(*elt));
+	elt->mctx = mctx;
+	ISC_LINK_INIT(elt, link);
+	elt->port = port;
+	elt->dscp = dscp;
+	elt->acl = acl;
+	*target = elt;
+	return (ISC_R_SUCCESS);
+}
+
+void
+ns_listenelt_destroy(ns_listenelt_t *elt) {
+	if (elt->acl != NULL) {
+		dns_acl_detach(&elt->acl);
+	}
+	isc_mem_put(elt->mctx, elt, sizeof(*elt));
+}
+
+isc_result_t
+ns_listenlist_create(isc_mem_t *mctx, ns_listenlist_t **target) {
+	ns_listenlist_t *list = NULL;
+	REQUIRE(target != NULL && *target == NULL);
+	list = isc_mem_get(mctx, sizeof(*list));
+	list->mctx = mctx;
+	list->refcount = 1;
+	ISC_LIST_INIT(list->elts);
+	*target = list;
+	return (ISC_R_SUCCESS);
+}
+
+static void
+destroy(ns_listenlist_t *list) {
+	ns_listenelt_t *elt, *next;
+	for (elt = ISC_LIST_HEAD(list->elts); elt != NULL; elt = next) {
+		next = ISC_LIST_NEXT(elt, link);
+		ns_listenelt_destroy(elt);
+	}
+	isc_mem_put(list->mctx, list, sizeof(*list));
+}
+
+void
+ns_listenlist_attach(ns_listenlist_t *source, ns_listenlist_t **target) {
+	INSIST(source->refcount > 0);
+	source->refcount++;
+	*target = source;
+}
+
+void
+ns_listenlist_detach(ns_listenlist_t **listp) {
+	ns_listenlist_t *list = *listp;
+	*listp = NULL;
+	INSIST(list->refcount > 0);
+	list->refcount--;
+	if (list->refcount == 0) {
+		destroy(list);
+	}
+}
+
+isc_result_t
+ns_listenlist_default(isc_mem_t *mctx, in_port_t port, isc_dscp_t dscp,
+		      bool enabled, ns_listenlist_t **target) {
+	isc_result_t result;
+	dns_acl_t *acl = NULL;
+	ns_listenelt_t *elt = NULL;
+	ns_listenlist_t *list = NULL;
+
+	REQUIRE(target != NULL && *target == NULL);
+	if (enabled) {
+		result = dns_acl_any(mctx, &acl);
+	} else {
+		result = dns_acl_none(mctx, &acl);
+	}
+	if (result != ISC_R_SUCCESS) {
+		goto cleanup;
+	}
+
+	result = ns_listenelt_create(mctx, port, dscp, acl, &elt);
+	if (result != ISC_R_SUCCESS) {
+		goto cleanup_acl;
+	}
+
+	result = ns_listenlist_create(mctx, &list);
+	if (result != ISC_R_SUCCESS) {
+		goto cleanup_listenelt;
+	}
+
+	ISC_LIST_APPEND(list->elts, elt, link);
+
+	*target = list;
+	return (ISC_R_SUCCESS);
+
+cleanup_listenelt:
+	ns_listenelt_destroy(elt);
+cleanup_acl:
+	dns_acl_detach(&acl);
+cleanup:
+	return (result);
+}