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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";
}
});
}
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