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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 "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<LuaAssociativeTable<boost::variant<bool, size_t, LuaArray<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;
size_t maxEntrySize{0};
bool dontAge = false;
bool deferrableInsertLock = true;
bool ecsParsing = false;
bool cookieHashing = false;
LuaArray<uint16_t> skipOptions;
std::unordered_set<uint16_t> optionsToSkip{EDNSOptionCode::COOKIE};
getOptionalValue<bool>(vars, "deferrableInsertLock", deferrableInsertLock);
getOptionalValue<bool>(vars, "dontAge", dontAge);
getOptionalValue<bool>(vars, "keepStaleData", keepStaleData);
getOptionalValue<size_t>(vars, "maxNegativeTTL", maxNegativeTTL);
getOptionalValue<size_t>(vars, "maxTTL", maxTTL);
getOptionalValue<size_t>(vars, "minTTL", minTTL);
getOptionalValue<size_t>(vars, "numberOfShards", numberOfShards);
getOptionalValue<bool>(vars, "parseECS", ecsParsing);
getOptionalValue<size_t>(vars, "staleTTL", staleTTL);
getOptionalValue<size_t>(vars, "temporaryFailureTTL", tempFailTTL);
getOptionalValue<bool>(vars, "cookieHashing", cookieHashing);
getOptionalValue<size_t>(vars, "maximumEntrySize", maxEntrySize);
if (getOptionalValue<decltype(skipOptions)>(vars, "skipOptions", skipOptions) > 0) {
for (const auto& option : skipOptions) {
optionsToSkip.insert(option.second);
}
}
if (cookieHashing) {
optionsToSkip.erase(EDNSOptionCode::COOKIE);
}
checkAllParametersConsumed("newPacketCache", vars);
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);
if (maxEntrySize >= sizeof(dnsheader)) {
res->setMaximumEntrySize(maxEntrySize);
}
return res;
});
#ifndef DISABLE_PACKETCACHE_BINDINGS
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";
g_outputBuffer+="Cleanup Count: " + std::to_string(cache->getCleanupCount()) + "\n";
}
});
luaCtx.registerFunction<LuaAssociativeTable<uint64_t>(std::shared_ptr<DNSDistPacketCache>::*)()const>("getStats", [](const std::shared_ptr<DNSDistPacketCache>& cache) {
LuaAssociativeTable<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();
stats["cleanupCount"] = cache->getCleanupCount();
}
return stats;
});
luaCtx.registerFunction<LuaArray<DNSName>(std::shared_ptr<DNSDistPacketCache>::*)(const ComboAddress& addr)const>("getDomainListByAddress", [](const std::shared_ptr<DNSDistPacketCache>& cache, const ComboAddress& addr) {
LuaArray<DNSName> results;
if (!cache) {
return results;
}
int counter = 1;
auto domains = cache->getDomainsContainingRecords(addr);
results.reserve(domains.size());
for (auto& domain : domains) {
results.emplace_back(counter, std::move(domain));
counter++;
}
return results;
});
luaCtx.registerFunction<LuaArray<ComboAddress>(std::shared_ptr<DNSDistPacketCache>::*)(const DNSName& domain)const>("getAddressListByDomain", [](const std::shared_ptr<DNSDistPacketCache>& cache, const DNSName& domain) {
LuaArray<ComboAddress> results;
if (!cache) {
return results;
}
int counter = 1;
auto addresses = cache->getRecordsForDomain(domain);
results.reserve(addresses.size());
for (auto& address : addresses) {
results.emplace_back(counter, std::move(address));
counter++;
}
return results;
});
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";
}
});
#endif /* DISABLE_PACKETCACHE_BINDINGS */
}
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