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https://gitlab.isc.org/isc-projects/bind9
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58bd26b6cf
This commit converts the license handling to adhere to the REUSE specification. It specifically: 1. Adds used licnses to LICENSES/ directory 2. Add "isc" template for adding the copyright boilerplate 3. Changes all source files to include copyright and SPDX license header, this includes all the C sources, documentation, zone files, configuration files. There are notes in the doc/dev/copyrights file on how to add correct headers to the new files. 4. Handle the rest that can't be modified via .reuse/dep5 file. The binary (or otherwise unmodifiable) files could have license places next to them in <foo>.license file, but this would lead to cluttered repository and most of the files handled in the .reuse/dep5 file are system test files.
46 lines
1.3 KiB
Plaintext
46 lines
1.3 KiB
Plaintext
<!--
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Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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SPDX-License-Identifier: MPL-2.0
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This Source Code Form is subject to the terms of the Mozilla Public
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License, v. 2.0. If a copy of the MPL was not distributed with this
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file, you can obtain one at https://mozilla.org/MPL/2.0/.
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See the COPYRIGHT file distributed with this work for additional
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information regarding copyright ownership.
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-->
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Negative Caching
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The non-DNSSEC case is pretty easy.
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foundname = soa name
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rdataset = soa
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node = NULL
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DNSSEC complicates things a lot, because we have to return one or more NXT
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records (if we have them) as proof. Another tricky bit here is that we may
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have an NXT record so we know the answer is NODATA, but we don't have the SOA
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so we can't make a NODATA response that a non-DNSSEC-aware server could
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cache. Life would sure be easier if we knew if the client understood DNSSEC.
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Not sure what to do in this case. Probably return delegation to force client
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to ask authority.
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Perhaps we should just create some kind of meta-rdata, the "negative cache
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rdata type"?
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Or maybe something like:
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dns_rdataset_ncachefirst()
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dns_rdataset_ncachenext()
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dns_rdataset_ncachecurrent()
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dns_db_ncachenew(db, type) /* type can be any */
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dns_db_ncachesoa(name, rdataset)
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dns_db_ncachenxt(name, rdataset)
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dns_db_ncacheadd(db, name, version)
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Ick. I favor the former.
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