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/*
* Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 1999-2002 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: interfacemgr.h,v 1.33 2007/06/19 23:46:59 tbox Exp $ */
#ifndef NAMED_INTERFACEMGR_H
#define NAMED_INTERFACEMGR_H 1
/*****
***** Module Info
*****/
/*! \file
* \brief
* The interface manager monitors the operating system's list
* of network interfaces, creating and destroying listeners
* as needed.
*
* Reliability:
*\li No impact expected.
*
* Resources:
*
* Security:
* \li The server will only be able to bind to the DNS port on
* newly discovered interfaces if it is running as root.
*
* Standards:
*\li The API for scanning varies greatly among operating systems.
* This module attempts to hide the differences.
*/
/***
*** Imports
***/
#include <isc/magic.h>
#include <isc/mem.h>
#include <isc/socket.h>
#include <dns/result.h>
#include <named/listenlist.h>
#include <named/types.h>
/***
*** Types
***/
#define IFACE_MAGIC ISC_MAGIC('I',':','-',')')
#define NS_INTERFACE_VALID(t) ISC_MAGIC_VALID(t, IFACE_MAGIC)
#define NS_INTERFACEFLAG_ANYADDR 0x01U /*%< bound to "any" address */
/*% The nameserver interface structure */
struct ns_interface {
unsigned int magic; /*%< Magic number. */
ns_interfacemgr_t * mgr; /*%< Interface manager. */
isc_mutex_t lock;
int references; /*%< Locked */
unsigned int generation; /*%< Generation number. */
isc_sockaddr_t addr; /*%< Address and port. */
unsigned int flags; /*%< Interface characteristics */
char name[32]; /*%< Null terminated. */
dns_dispatch_t * udpdispatch; /*%< UDP dispatcher. */
isc_socket_t * tcpsocket; /*%< TCP socket. */
int ntcptarget; /*%< Desired number of concurrent
TCP accepts */
int ntcpcurrent; /*%< Current ditto, locked */
ns_clientmgr_t * clientmgr; /*%< Client manager. */
ISC_LINK(ns_interface_t) link;
};
/***
*** Functions
***/
isc_result_t
ns_interfacemgr_create(isc_mem_t *mctx, isc_taskmgr_t *taskmgr,
isc_socketmgr_t *socketmgr,
dns_dispatchmgr_t *dispatchmgr,
ns_interfacemgr_t **mgrp);
/*%
* Create a new interface manager.
*
* Initially, the new manager will not listen on any interfaces.
* Call ns_interfacemgr_setlistenon() and/or ns_interfacemgr_setlistenon6()
* to set nonempty listen-on lists.
*/
void
ns_interfacemgr_attach(ns_interfacemgr_t *source, ns_interfacemgr_t **target);
void
ns_interfacemgr_detach(ns_interfacemgr_t **targetp);
void
ns_interfacemgr_shutdown(ns_interfacemgr_t *mgr);
void
ns_interfacemgr_scan(ns_interfacemgr_t *mgr, isc_boolean_t verbose);
/*%
* Scan the operatings system's list of network interfaces
* and create listeners when new interfaces are discovered.
* Shut down the sockets for interfaces that go away.
*
* This should be called once on server startup and then
* periodically according to the 'interface-interval' option
* in named.conf.
*/
void
ns_interfacemgr_adjust(ns_interfacemgr_t *mgr, ns_listenlist_t *list,
isc_boolean_t verbose);
/*%
* Similar to ns_interfacemgr_scan(), but this function also tries to see the
* need for an explicit listen-on when a list element in 'list' is going to
* override an already-listening a wildcard interface.
*
* This function does not update localhost and localnets ACLs.
*
* This should be called once on server startup, after configuring views and
* zones.
*/
void
ns_interfacemgr_setlistenon4(ns_interfacemgr_t *mgr, ns_listenlist_t *value);
/*%
* Set the IPv4 "listen-on" list of 'mgr' to 'value'.
* The previous IPv4 listen-on list is freed.
*/
void
ns_interfacemgr_setlistenon6(ns_interfacemgr_t *mgr, ns_listenlist_t *value);
/*%
* Set the IPv6 "listen-on" list of 'mgr' to 'value'.
* The previous IPv6 listen-on list is freed.
*/
dns_aclenv_t *
ns_interfacemgr_getaclenv(ns_interfacemgr_t *mgr);
void
ns_interface_attach(ns_interface_t *source, ns_interface_t **target);
void
ns_interface_detach(ns_interface_t **targetp);
void
ns_interface_shutdown(ns_interface_t *ifp);
/*%
* Stop listening for queries on interface 'ifp'.
* May safely be called multiple times.
*/
void
ns_interfacemgr_dumprecursing(FILE *f, ns_interfacemgr_t *mgr);
isc_boolean_t
ns_interfacemgr_listeningon(ns_interfacemgr_t *mgr, isc_sockaddr_t *addr);
#endif /* NAMED_INTERFACEMGR_H */
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