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byaddr.h
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/* * Copyright (C) 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 https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ #ifndef DNS_BYADDR_H #define DNS_BYADDR_H 1 /***** ***** Module Info *****/ /*! \file dns/byaddr.h * \brief * The byaddr module provides reverse lookup services for IPv4 and IPv6 * addresses. * * MP: *\li The module ensures appropriate synchronization of data structures it * creates and manipulates. * * Reliability: *\li No anticipated impact. * * Resources: *\li TBS * * Security: *\li No anticipated impact. * * Standards: *\li RFCs: 1034, 1035, 2181, TBS *\li Drafts: TBS */ #include <stdbool.h> #include <isc/lang.h> #include <isc/event.h> #include <dns/types.h> ISC_LANG_BEGINDECLS /*% * A 'dns_byaddrevent_t' is returned when a byaddr completes. * The sender field will be set to the byaddr that completed. If 'result' * is ISC_R_SUCCESS, then 'names' will contain a list of names associated * with the address. The recipient of the event must not change the list * and must not refer to any of the name data after the event is freed. */ typedef struct dns_byaddrevent { ISC_EVENT_COMMON(struct dns_byaddrevent); isc_result_t result; dns_namelist_t names; } dns_byaddrevent_t; /* * This option is deprecated since we now only consider nibbles. #define DNS_BYADDROPT_IPV6NIBBLE 0x0001 */ /*% Note DNS_BYADDROPT_IPV6NIBBLE is now deprecated. */ #define DNS_BYADDROPT_IPV6INT 0x0002 isc_result_t dns_byaddr_create(isc_mem_t *mctx, isc_netaddr_t *address, dns_view_t *view, unsigned int options, isc_task_t *task, isc_taskaction_t action, void *arg, dns_byaddr_t **byaddrp); /*%< * Find the domain name of 'address'. * * Notes: * *\li There is a reverse lookup format for IPv6 addresses, 'nibble' * *\li The 'nibble' format for that address is * * \code * 1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.e.f.ip6.arpa. * \endcode * *\li #DNS_BYADDROPT_IPV6INT can be used to get nibble lookups under ip6.int. * * Requires: * *\li 'mctx' is a valid mctx. * *\li 'address' is a valid IPv4 or IPv6 address. * *\li 'view' is a valid view which has a resolver. * *\li 'task' is a valid task. * *\li byaddrp != NULL && *byaddrp == NULL * * Returns: * *\li #ISC_R_SUCCESS *\li #ISC_R_NOMEMORY * *\li Any resolver-related error (e.g. #ISC_R_SHUTTINGDOWN) may also be * returned. */ void dns_byaddr_cancel(dns_byaddr_t *byaddr); /*%< * Cancel 'byaddr'. * * Notes: * *\li If 'byaddr' has not completed, post its #DNS_EVENT_BYADDRDONE * event with a result code of #ISC_R_CANCELED. * * Requires: * *\li 'byaddr' is a valid byaddr. */ void dns_byaddr_destroy(dns_byaddr_t **byaddrp); /*%< * Destroy 'byaddr'. * * Requires: * *\li '*byaddrp' is a valid byaddr. * *\li The caller has received the #DNS_EVENT_BYADDRDONE event (either because * the byaddr completed or because dns_byaddr_cancel() was called). * * Ensures: * *\li *byaddrp == NULL. */ isc_result_t dns_byaddr_createptrname(isc_netaddr_t *address, bool nibble, dns_name_t *name); isc_result_t dns_byaddr_createptrname2(isc_netaddr_t *address, unsigned int options, dns_name_t *name); /*%< * Creates a name that would be used in a PTR query for this address. The * nibble flag indicates that the 'nibble' format is to be used if an IPv6 * address is provided, instead of the 'bitstring' format. Since we dropped * the support of the bitstring labels, it is expected that the flag is always * set. 'options' are the same as for dns_byaddr_create(). * * Requires: * * \li 'address' is a valid address. * \li 'name' is a valid name with a dedicated buffer. */ ISC_LANG_ENDDECLS #endif /* DNS_BYADDR_H */