bin/named/listenlist.c

/*
 * Copyright (C) 2000, 2001, 2004, 2005, 2007, 2013, 2016  Internet Systems Consortium, Inc. ("ISC")
 *
 * 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 http://mozilla.org/MPL/2.0/.
 */

/* $Id: listenlist.c,v 1.14 2007/06/19 23:46:59 tbox Exp $ */

/*! \file */

#include <config.h>

#include <isc/mem.h>
#include <isc/util.h>

#include <dns/acl.h>

#include <named/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));
    if (elt == NULL)
        return (ISC_R_NOMEMORY);
    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));
    if (list == NULL)
        return (ISC_R_NOMEMORY);
    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;
    INSIST(list->refcount > 0);
    list->refcount--;
    if (list->refcount == 0)
        destroy(list);
    *listp = NULL;
}

isc_result_t
ns_listenlist_default(isc_mem_t *mctx, in_port_t port, isc_dscp_t dscp,
              isc_boolean_t 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);
}