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-rw-r--r--dnsdist-lua-bindings-packetcache.cc220
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diff --git a/dnsdist-lua-bindings-packetcache.cc b/dnsdist-lua-bindings-packetcache.cc
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+++ b/dnsdist-lua-bindings-packetcache.cc
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+/*
+ * This file is part of PowerDNS or dnsdist.
+ * Copyright -- PowerDNS.COM B.V. and its contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * In addition, for the avoidance of any doubt, permission is granted to
+ * link this program with OpenSSL and to (re)distribute the binaries
+ * produced as the result of such linking.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "config.h"
+#include "dolog.hh"
+#include "dnsdist.hh"
+#include "dnsdist-lua.hh"
+
+#include <boost/lexical_cast.hpp>
+
+void setupLuaBindingsPacketCache(LuaContext& luaCtx, bool client)
+{
+ /* PacketCache */
+ luaCtx.writeFunction("newPacketCache", [client](size_t maxEntries, boost::optional<std::unordered_map<std::string, boost::variant<bool, size_t, std::vector<std::pair<int, uint16_t>>>>> vars) {
+
+ bool keepStaleData = false;
+ size_t maxTTL = 86400;
+ size_t minTTL = 0;
+ size_t tempFailTTL = 60;
+ size_t maxNegativeTTL = 3600;
+ size_t staleTTL = 60;
+ size_t numberOfShards = 20;
+ bool dontAge = false;
+ bool deferrableInsertLock = true;
+ bool ecsParsing = false;
+ std::unordered_set<uint16_t> optionsToSkip{EDNSOptionCode::COOKIE};
+
+ if (vars) {
+
+ if (vars->count("deferrableInsertLock")) {
+ deferrableInsertLock = boost::get<bool>((*vars)["deferrableInsertLock"]);
+ }
+
+ if (vars->count("dontAge")) {
+ dontAge = boost::get<bool>((*vars)["dontAge"]);
+ }
+
+ if (vars->count("keepStaleData")) {
+ keepStaleData = boost::get<bool>((*vars)["keepStaleData"]);
+ }
+
+ if (vars->count("maxNegativeTTL")) {
+ maxNegativeTTL = boost::get<size_t>((*vars)["maxNegativeTTL"]);
+ }
+
+ if (vars->count("maxTTL")) {
+ maxTTL = boost::get<size_t>((*vars)["maxTTL"]);
+ }
+
+ if (vars->count("minTTL")) {
+ minTTL = boost::get<size_t>((*vars)["minTTL"]);
+ }
+
+ if (vars->count("numberOfShards")) {
+ numberOfShards = boost::get<size_t>((*vars)["numberOfShards"]);
+ }
+
+ if (vars->count("parseECS")) {
+ ecsParsing = boost::get<bool>((*vars)["parseECS"]);
+ }
+
+ if (vars->count("staleTTL")) {
+ staleTTL = boost::get<size_t>((*vars)["staleTTL"]);
+ }
+
+ if (vars->count("temporaryFailureTTL")) {
+ tempFailTTL = boost::get<size_t>((*vars)["temporaryFailureTTL"]);
+ }
+
+ if (vars->count("cookieHashing")) {
+ if (boost::get<bool>((*vars)["cookieHashing"])) {
+ optionsToSkip.erase(EDNSOptionCode::COOKIE);
+ }
+ }
+ if (vars->count("skipOptions")) {
+ for (auto option: boost::get<std::vector<std::pair<int, uint16_t>>>(vars->at("skipOptions"))) {
+ optionsToSkip.insert(option.second);
+ }
+ }
+ }
+
+ if (maxEntries == 0) {
+ warnlog("The number of entries in the packet cache is set to 0, raising to 1");
+ g_outputBuffer += "The number of entries in the packet cache is set to 0, raising to 1";
+ maxEntries = 1;
+ }
+
+ if (maxEntries < numberOfShards) {
+ warnlog("The number of entries (%d) in the packet cache is smaller than the number of shards (%d), decreasing the number of shards to %d", maxEntries, numberOfShards, maxEntries);
+ g_outputBuffer += "The number of entries (" + std::to_string(maxEntries) + " in the packet cache is smaller than the number of shards (" + std::to_string(numberOfShards) + "), decreasing the number of shards to " + std::to_string(maxEntries);
+ numberOfShards = maxEntries;
+ }
+
+ if (client) {
+ maxEntries = 1;
+ numberOfShards = 1;
+ }
+
+ auto res = std::make_shared<DNSDistPacketCache>(maxEntries, maxTTL, minTTL, tempFailTTL, maxNegativeTTL, staleTTL, dontAge, numberOfShards, deferrableInsertLock, ecsParsing);
+
+ res->setKeepStaleData(keepStaleData);
+ res->setSkippedOptions(optionsToSkip);
+
+ return res;
+ });
+ luaCtx.registerFunction<std::string(std::shared_ptr<DNSDistPacketCache>::*)()const>("toString", [](const std::shared_ptr<DNSDistPacketCache>& cache) {
+ if (cache) {
+ return cache->toString();
+ }
+ return std::string();
+ });
+ luaCtx.registerFunction<bool(std::shared_ptr<DNSDistPacketCache>::*)()const>("isFull", [](const std::shared_ptr<DNSDistPacketCache>& cache) {
+ if (cache) {
+ return cache->isFull();
+ }
+ return false;
+ });
+ luaCtx.registerFunction<size_t(std::shared_ptr<DNSDistPacketCache>::*)(size_t)>("purgeExpired", [](std::shared_ptr<DNSDistPacketCache>& cache, size_t upTo) {
+ if (cache) {
+ const time_t now = time(nullptr);
+
+ return cache->purgeExpired(upTo, now);
+ }
+ return static_cast<size_t>(0);
+ });
+ luaCtx.registerFunction<size_t(std::shared_ptr<DNSDistPacketCache>::*)(size_t)>("expunge", [](std::shared_ptr<DNSDistPacketCache>& cache, size_t upTo) {
+ if (cache) {
+ return cache->expunge(upTo);
+ }
+ return static_cast<size_t>(0);
+ });
+ luaCtx.registerFunction<void(std::shared_ptr<DNSDistPacketCache>::*)(const boost::variant<DNSName, string>& dname, boost::optional<uint16_t> qtype, boost::optional<bool> suffixMatch)>("expungeByName", [](
+ std::shared_ptr<DNSDistPacketCache>& cache,
+ const boost::variant<DNSName, string>& dname,
+ boost::optional<uint16_t> qtype,
+ boost::optional<bool> suffixMatch) {
+ DNSName qname;
+ if (dname.type() == typeid(DNSName)) {
+ qname = boost::get<DNSName>(dname);
+ }
+ if (dname.type() == typeid(string)) {
+ qname = DNSName(boost::get<string>(dname));
+ }
+ if (cache) {
+ g_outputBuffer="Expunged " + std::to_string(cache->expungeByName(qname, qtype ? *qtype : QType(QType::ANY).getCode(), suffixMatch ? *suffixMatch : false)) + " records\n";
+ }
+ });
+ luaCtx.registerFunction<void(std::shared_ptr<DNSDistPacketCache>::*)()const>("printStats", [](const std::shared_ptr<DNSDistPacketCache>& cache) {
+ if (cache) {
+ g_outputBuffer="Entries: " + std::to_string(cache->getEntriesCount()) + "/" + std::to_string(cache->getMaxEntries()) + "\n";
+ g_outputBuffer+="Hits: " + std::to_string(cache->getHits()) + "\n";
+ g_outputBuffer+="Misses: " + std::to_string(cache->getMisses()) + "\n";
+ g_outputBuffer+="Deferred inserts: " + std::to_string(cache->getDeferredInserts()) + "\n";
+ g_outputBuffer+="Deferred lookups: " + std::to_string(cache->getDeferredLookups()) + "\n";
+ g_outputBuffer+="Lookup Collisions: " + std::to_string(cache->getLookupCollisions()) + "\n";
+ g_outputBuffer+="Insert Collisions: " + std::to_string(cache->getInsertCollisions()) + "\n";
+ g_outputBuffer+="TTL Too Shorts: " + std::to_string(cache->getTTLTooShorts()) + "\n";
+ }
+ });
+ luaCtx.registerFunction<std::unordered_map<std::string, uint64_t>(std::shared_ptr<DNSDistPacketCache>::*)()const>("getStats", [](const std::shared_ptr<DNSDistPacketCache>& cache) {
+ std::unordered_map<std::string, uint64_t> stats;
+ if (cache) {
+ stats["entries"] = cache->getEntriesCount();
+ stats["maxEntries"] = cache->getMaxEntries();
+ stats["hits"] = cache->getHits();
+ stats["misses"] = cache->getMisses();
+ stats["deferredInserts"] = cache->getDeferredInserts();
+ stats["deferredLookups"] = cache->getDeferredLookups();
+ stats["lookupCollisions"] = cache->getLookupCollisions();
+ stats["insertCollisions"] = cache->getInsertCollisions();
+ stats["ttlTooShorts"] = cache->getTTLTooShorts();
+ }
+ return stats;
+ });
+ luaCtx.registerFunction<void(std::shared_ptr<DNSDistPacketCache>::*)(const std::string& fname)const>("dump", [](const std::shared_ptr<DNSDistPacketCache>& cache, const std::string& fname) {
+ if (cache) {
+
+ int fd = open(fname.c_str(), O_CREAT | O_EXCL | O_WRONLY, 0660);
+ if (fd < 0) {
+ g_outputBuffer = "Error opening dump file for writing: " + stringerror() + "\n";
+ return;
+ }
+
+ uint64_t records = 0;
+ try {
+ records = cache->dump(fd);
+ }
+ catch (const std::exception& e) {
+ close(fd);
+ throw;
+ }
+
+ close(fd);
+
+ g_outputBuffer += "Dumped " + std::to_string(records) + " records\n";
+ }
+ });
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-20 00:02:54 +0000