/usr/include/dns/clientinfo.h is in libbind-dev 1:9.11.3+dfsg-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 | /*
 * Copyright (C) 2011, 2014, 2016  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 http://mozilla.org/MPL/2.0/.
 */
/* $Id: clientinfo.h,v 1.3 2011/10/11 23:46:45 tbox Exp $ */
#ifndef DNS_CLIENTINFO_H
#define DNS_CLIENTINFO_H 1
/*****
 ***** Module Info
 *****/
/*! \file dns/clientinfo.h
 * \brief
 * The DNS clientinfo interface allows libdns to retrieve information
 * about the client from the caller.
 *
 * The clientinfo interface is used by the DNS DB and DLZ interfaces;
 * it allows databases to modify their answers on the basis of information
 * about the client, such as source IP address.
 *
 * dns_clientinfo_t contains a pointer to an opaque structure containing
 * client information in some form.  dns_clientinfomethods_t contains a
 * list of methods which operate on that opaque structure to return
 * potentially useful data.  Both structures also contain versioning
 * information.
 */
/*****
 ***** Imports
 *****/
#include <isc/sockaddr.h>
#include <isc/types.h>
ISC_LANG_BEGINDECLS
/*****
 ***** Types
 *****/
#define DNS_CLIENTINFO_VERSION 2
typedef struct dns_clientinfo {
	isc_uint16_t version;
	void *data;
	void *dbversion;
} dns_clientinfo_t;
typedef isc_result_t (*dns_clientinfo_sourceip_t)(dns_clientinfo_t *client,
						  isc_sockaddr_t **addrp);
#define DNS_CLIENTINFOMETHODS_VERSION 1
#define DNS_CLIENTINFOMETHODS_AGE 0
typedef struct dns_clientinfomethods {
	isc_uint16_t version;
	isc_uint16_t age;
	dns_clientinfo_sourceip_t sourceip;
} dns_clientinfomethods_t;
/*****
 ***** Methods
 *****/
void
dns_clientinfomethods_init(dns_clientinfomethods_t *methods,
			   dns_clientinfo_sourceip_t sourceip);
void
dns_clientinfo_init(dns_clientinfo_t *ci, void *data, void *versionp);
ISC_LANG_ENDDECLS
#endif /* DNS_CLIENTINFO_H */
 |