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Diffstat (limited to 'lib/ns/include/ns/interfacemgr.h')
| -rw-r--r-- | lib/ns/include/ns/interfacemgr.h | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/lib/ns/include/ns/interfacemgr.h b/lib/ns/include/ns/interfacemgr.h new file mode 100644 index 0000000..028f86d --- /dev/null +++ b/lib/ns/include/ns/interfacemgr.h @@ -0,0 +1,192 @@ +/* + * 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 *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.) + */ |