This file is indexed.

/usr/include/dns/edns.h is in libbind-dev 1:9.11.3+dfsg-1ubuntu1.

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The actual contents of the file can be viewed below.

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/*
 * Copyright (C) 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/.
 */

#ifndef DNS_EDNS_H
#define DNS_EDNS_H 1

/*%
 * The maximum version on EDNS supported by this build.
 */
#define DNS_EDNS_VERSION 0
#ifdef DRAFT_ANDREWS_EDNS1
#undef DNS_EDNS_VERSION
/*
 * Warning: this currently disables sending COOKIE requests in resolver.c
 */
#define DNS_EDNS_VERSION 1 /* draft-andrews-edns1 */
#endif

#endif