listenlist.c

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/*
 * Copyright (C) 2004, 2005, 2007, 2013  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 2000, 2001  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

/* $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);
}

---