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A qp-trie is a kind of radix tree that is particularly well-suited to DNS servers. I invented the qp-trie in 2015, based on Dan Bernstein's crit-bit trees and Phil Bagwell's HAMT. https://dotat.at/prog/qp/ This code incorporates some new ideas that I prototyped using NLnet Labs NSD in 2020 (optimizations for DNS names as keys) and 2021 (custom allocator and garbage collector). https://dotat.at/cgi/git/nsd.git The BIND version of my qp-trie code has a number of improvements compared to the prototype developed for NSD. * The main omission in the prototype was the very sketchy outline of how locking might work. Now the locking has been implemented, using a reader/writer lock and a mutex. However, it is designed to benefit from liburcu if that is available. * The prototype was designed for two-version concurrency, one version for readers and one for the writer. The new code supports multiversion concurrency, to provide a basis for BIND's dbversion machinery, so that updates are not blocked by long-running zone transfers. * There are now two kinds of transaction that modify the trie: an `update` aims to support many very small zones without wasting memory; a `write` avoids unnecessary allocation to help the performance of many small changes to the cache. * There is also a single-threaded interface for situations where concurrent access is not necessary. * The API makes better use of types to make it more clear which operations are permitted when. * The lookup table used to convert a DNS name to a qp-trie key is now initialized by a run-time constructor instead of a programmer using copy-and-paste. Key conversion is more flexible, so the qp-trie can be used with keys other than DNS names. * There has been much refactoring and re-arranging things to improve the terminology and order of presentation in the code, and the internal documentation has been moved from a comment into a file of its own. Some of the required functionality has been stripped out, to be brought back later after the basics are known to work. * Garbage collector performance statistics are missing. * Fancy searches are missing, such as longest match and nearest match. * Iteration is missing. * Search for update is missing, for cases where the caller needs to know if the value object is mutable or not.
66 lines
2.1 KiB
C
66 lines
2.1 KiB
C
/*
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* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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*
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* SPDX-License-Identifier: MPL-2.0
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*
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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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*
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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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/*! \file */
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#include <isc/util.h>
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#include <dns/log.h>
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/*%
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* When adding a new category, be sure to add the appropriate
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* \#define to <dns/log.h>.
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*/
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isc_logcategory_t dns_categories[] = {
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{ "notify", 0 }, { "database", 0 }, { "security", 0 },
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{ "_placeholder", 0 }, { "dnssec", 0 }, { "resolver", 0 },
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{ "xfer-in", 0 }, { "xfer-out", 0 }, { "dispatch", 0 },
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{ "lame-servers", 0 }, { "delegation-only", 0 }, { "edns-disabled", 0 },
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{ "rpz", 0 }, { "rate-limit", 0 }, { "cname", 0 },
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{ "spill", 0 }, { "dnstap", 0 }, { "zoneload", 0 },
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{ "nsid", 0 }, { "rpz-passthru", 0 }, { NULL, 0 }
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};
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/*%
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* When adding a new module, be sure to add the appropriate
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* \#define to <dns/log.h>.
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*/
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isc_logmodule_t dns_modules[] = {
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{ "dns/db", 0 }, { "dns/rbtdb", 0 }, { "dns/rbt", 0 },
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{ "dns/rdata", 0 }, { "dns/master", 0 }, { "dns/message", 0 },
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{ "dns/cache", 0 }, { "dns/config", 0 }, { "dns/resolver", 0 },
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{ "dns/zone", 0 }, { "dns/journal", 0 }, { "dns/adb", 0 },
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{ "dns/xfrin", 0 }, { "dns/xfrout", 0 }, { "dns/acl", 0 },
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{ "dns/validator", 0 }, { "dns/dispatch", 0 }, { "dns/request", 0 },
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{ "dns/masterdump", 0 }, { "dns/tsig", 0 }, { "dns/tkey", 0 },
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{ "dns/sdb", 0 }, { "dns/diff", 0 }, { "dns/hints", 0 },
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{ "dns/unused1", 0 }, { "dns/dlz", 0 }, { "dns/dnssec", 0 },
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{ "dns/crypto", 0 }, { "dns/packets", 0 }, { "dns/nta", 0 },
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{ "dns/dyndb", 0 }, { "dns/dnstap", 0 }, { "dns/ssu", 0 },
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{ "dns/qp", 0 }, { NULL, 0 },
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};
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isc_log_t *dns_lctx = NULL;
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void
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dns_log_init(isc_log_t *lctx) {
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REQUIRE(lctx != NULL);
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isc_log_registercategories(lctx, dns_categories);
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isc_log_registermodules(lctx, dns_modules);
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}
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void
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dns_log_setcontext(isc_log_t *lctx) {
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dns_lctx = lctx;
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}
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