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client.h
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/* * 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. */ #pragma once /***** ***** 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 <stdbool.h> #include <isc/magic.h> #include <isc/mem.h> #include <isc/netmgr.h> #include <isc/refcount.h> #include <isc/result.h> #include <dns/geoip.h> #include <ns/listenlist.h> #include <ns/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 */ #define NS_INTERFACEFLAG_LISTENING 0x02U /*%< listening */ #define MAX_UDP_DISPATCH \ 128 /*%< Maximum number of UDP dispatchers \ * to start per interface */ /*% The nameserver interface structure */ struct ns_interface { unsigned int magic; /*%< Magic number. */ ns_interfacemgr_t *mgr; /*%< Interface manager. */ isc_mutex_t lock; unsigned int generation; /*%< Generation number. */ isc_sockaddr_t addr; /*%< Address and port. */ unsigned int flags; /*%< Interface flags */ char name[32]; /*%< Null terminated. */ isc_nmsocket_t *udplistensocket; isc_nmsocket_t *tcplistensocket; isc_nmsocket_t *tlslistensocket; isc_nmsocket_t *http_listensocket; isc_nmsocket_t *http_secure_listensocket; isc_quota_t *http_quota; isc_refcount_t ntcpaccepting; /*%< Number of clients * ready to accept new * TCP connections on this * interface */ isc_refcount_t ntcpactive; /*%< Number of clients * servicing TCP queries * (whether accepting or * connected) */ ns_clientmgr_t *clientmgr; /*%< Client manager. */ ISC_LINK(ns_interface_t) link; }; /*** *** Functions ***/ isc_result_t ns_interfacemgr_create(isc_mem_t *mctx, ns_server_t *sctx, isc_taskmgr_t *taskmgr, isc_timermgr_t *timermgr, isc_nm_t *nm, dns_dispatchmgr_t *dispatchmgr, isc_task_t *task, dns_geoip_databases_t *geoip, int ncpus, bool scan, 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_setbacklog(ns_interfacemgr_t *mgr, int backlog); /*%< * Set the size of the listen() backlog queue. */ bool ns_interfacemgr_islistening(ns_interfacemgr_t *mgr); /*%< * Return if the manager is listening on any interface. It can be called * after a scan or adjust. */ isc_result_t ns_interfacemgr_scan(ns_interfacemgr_t *mgr, bool verbose, bool config); /*%< * 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. * * When 'config' is true, also shut down and recreate any existing TLS and HTTPS * interfaces in order to use their new configuration. * * This should be called once on server startup and then * periodically according to the 'interface-interval' option * in named.conf. */ 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_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); bool ns_interfacemgr_listeningon(ns_interfacemgr_t *mgr, const isc_sockaddr_t *addr); ns_server_t * ns_interfacemgr_getserver(ns_interfacemgr_t *mgr); /*%< * Returns the ns_server object associated with the interface manager. */ ns_clientmgr_t * ns_interfacemgr_getclientmgr(ns_interfacemgr_t *mgr); /*%< * * Returns the client manager for the current worker thread. * (This cannot be run from outside a network manager thread.) */