pdns/dnsdist-lua-bindings.cc

   1 /*
   2  * This file is part of PowerDNS or dnsdist.
   3  * Copyright -- PowerDNS.COM B.V. and its contributors
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * In addition, for the avoidance of any doubt, permission is granted to
  10  * link this program with OpenSSL and to (re)distribute the binaries
  11  * produced as the result of such linking.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  */
  22 #include "config.h"
  23 #include "dnsdist.hh"
  24 #include "dnsdist-lua.hh"
  25
  26 #include "dolog.hh"
  27
  28 void setupLuaBindings(bool client)
  29 {
  30   g_lua.writeFunction("infolog", [](const string& arg) {
  31       infolog("%s", arg);
  32     });
  33   g_lua.writeFunction("errlog", [](const string& arg) {
  34       errlog("%s", arg);
  35     });
  36   g_lua.writeFunction("warnlog", [](const string& arg) {
  37       warnlog("%s", arg);
  38     });
  39   g_lua.writeFunction("show", [](const string& arg) {
  40       g_outputBuffer+=arg;
  41       g_outputBuffer+="\n";
  42     });
  43
  44   /* Exceptions */
  45   g_lua.registerFunction<string(std::exception_ptr::*)()>("__tostring", [](const std::exception_ptr& eptr) {
  46       try {
  47         if (eptr) {
  48           std::rethrow_exception(eptr);
  49         }
  50       } catch(const std::exception& e) {
  51         return string(e.what());
  52       } catch(const PDNSException& e) {
  53         return e.reason;
  54       } catch(...) {
  55         return string("Unknown exception");
  56       }
  57       return string("No exception");
  58     });
  59   /* ServerPolicy */
  60   g_lua.writeFunction("newServerPolicy", [](string name, ServerPolicy::policyfunc_t policy) { return std::make_shared<ServerPolicy>(name, policy, true);});
  61   g_lua.registerMember("name", &ServerPolicy::name);
  62   g_lua.registerMember("policy", &ServerPolicy::policy);
  63   g_lua.registerMember("ffipolicy", &ServerPolicy::ffipolicy);
  64   g_lua.registerMember("isLua", &ServerPolicy::isLua);
  65   g_lua.registerMember("isFFI", &ServerPolicy::isFFI);
  66   g_lua.registerFunction("toString", &ServerPolicy::toString);
  67
  68   g_lua.writeVariable("firstAvailable", ServerPolicy{"firstAvailable", firstAvailable, false});
  69   g_lua.writeVariable("roundrobin", ServerPolicy{"roundrobin", roundrobin, false});
  70   g_lua.writeVariable("wrandom", ServerPolicy{"wrandom", wrandom, false});
  71   g_lua.writeVariable("whashed", ServerPolicy{"whashed", whashed, false});
  72   g_lua.writeVariable("chashed", ServerPolicy{"chashed", chashed, false});
  73   g_lua.writeVariable("leastOutstanding", ServerPolicy{"leastOutstanding", leastOutstanding, false});
  74
  75   /* ServerPool */
  76   g_lua.registerFunction<void(std::shared_ptr<ServerPool>::*)(std::shared_ptr<DNSDistPacketCache>)>("setCache", [](std::shared_ptr<ServerPool> pool, std::shared_ptr<DNSDistPacketCache> cache) {
  77       if (pool) {
  78         pool->packetCache = cache;
  79       }
  80     });
  81   g_lua.registerFunction("getCache", &ServerPool::getCache);
  82   g_lua.registerFunction<void(std::shared_ptr<ServerPool>::*)()>("unsetCache", [](std::shared_ptr<ServerPool> pool) {
  83       if (pool) {
  84         pool->packetCache = nullptr;
  85       }
  86     });
  87   g_lua.registerFunction("getECS", &ServerPool::getECS);
  88   g_lua.registerFunction("setECS", &ServerPool::setECS);
  89
  90   /* DownstreamState */
  91   g_lua.registerFunction<void(DownstreamState::*)(int)>("setQPS", [](DownstreamState& s, int lim) { s.qps = lim ? QPSLimiter(lim, lim) : QPSLimiter(); });
  92   g_lua.registerFunction<void(std::shared_ptr<DownstreamState>::*)(string)>("addPool", [](std::shared_ptr<DownstreamState> s, string pool) {
  93       auto localPools = g_pools.getCopy();
  94       addServerToPool(localPools, pool, s);
  95       g_pools.setState(localPools);
  96       s->pools.insert(pool);
  97     });
  98   g_lua.registerFunction<void(std::shared_ptr<DownstreamState>::*)(string)>("rmPool", [](std::shared_ptr<DownstreamState> s, string pool) {
  99       auto localPools = g_pools.getCopy();
 100       removeServerFromPool(localPools, pool, s);
 101       g_pools.setState(localPools);
 102       s->pools.erase(pool);
 103     });
 104   g_lua.registerFunction<uint64_t(DownstreamState::*)()>("getOutstanding", [](const DownstreamState& s) { return s.outstanding.load(); });
 105   g_lua.registerFunction("isUp", &DownstreamState::isUp);
 106   g_lua.registerFunction("setDown", &DownstreamState::setDown);
 107   g_lua.registerFunction("setUp", &DownstreamState::setUp);
 108   g_lua.registerFunction<void(DownstreamState::*)(boost::optional<bool> newStatus)>("setAuto", [](DownstreamState& s, boost::optional<bool> newStatus) {
 109       if (newStatus) {
 110         s.upStatus = *newStatus;
 111       }
 112       s.setAuto();
 113     });
 114   g_lua.registerFunction("getName", &DownstreamState::getName);
 115   g_lua.registerFunction("getNameWithAddr", &DownstreamState::getNameWithAddr);
 116   g_lua.registerMember("upStatus", &DownstreamState::upStatus);
 117   g_lua.registerMember<int (DownstreamState::*)>("weight",
 118     [](const DownstreamState& s) -> int {return s.weight;},
 119     [](DownstreamState& s, int newWeight) {s.setWeight(newWeight);}
 120   );
 121   g_lua.registerMember("order", &DownstreamState::order);
 122   g_lua.registerMember<const std::string(DownstreamState::*)>("name", [](const DownstreamState& backend) -> const std::string { return backend.getName(); }, [](DownstreamState& backend, const std::string& newName) { backend.setName(newName); });
 123   g_lua.registerFunction<std::string(DownstreamState::*)()>("getID", [](const DownstreamState& s) { return boost::uuids::to_string(s.id); });
 124
 125   /* dnsheader */
 126   g_lua.registerFunction<void(dnsheader::*)(bool)>("setRD", [](dnsheader& dh, bool v) {
 127       dh.rd=v;
 128     });
 129
 130   g_lua.registerFunction<bool(dnsheader::*)()>("getRD", [](dnsheader& dh) {
 131       return (bool)dh.rd;
 132     });
 133
 134   g_lua.registerFunction<void(dnsheader::*)(bool)>("setRA", [](dnsheader& dh, bool v) {
 135       dh.ra=v;
 136     });
 137
 138   g_lua.registerFunction<bool(dnsheader::*)()>("getRA", [](dnsheader& dh) {
 139       return (bool)dh.ra;
 140     });
 141
 142   g_lua.registerFunction<void(dnsheader::*)(bool)>("setAD", [](dnsheader& dh, bool v) {
 143       dh.ad=v;
 144     });
 145
 146   g_lua.registerFunction<bool(dnsheader::*)()>("getAD", [](dnsheader& dh) {
 147       return (bool)dh.ad;
 148     });
 149
 150   g_lua.registerFunction<void(dnsheader::*)(bool)>("setAA", [](dnsheader& dh, bool v) {
 151       dh.aa=v;
 152     });
 153
 154   g_lua.registerFunction<bool(dnsheader::*)()>("getAA", [](dnsheader& dh) {
 155       return (bool)dh.aa;
 156     });
 157
 158   g_lua.registerFunction<void(dnsheader::*)(bool)>("setCD", [](dnsheader& dh, bool v) {
 159       dh.cd=v;
 160     });
 161
 162   g_lua.registerFunction<bool(dnsheader::*)()>("getCD", [](dnsheader& dh) {
 163       return (bool)dh.cd;
 164     });
 165
 166   g_lua.registerFunction<void(dnsheader::*)(bool)>("setTC", [](dnsheader& dh, bool v) {
 167       dh.tc=v;
 168       if(v) dh.ra = dh.rd; // you'll always need this, otherwise TC=1 gets ignored
 169     });
 170
 171   g_lua.registerFunction<void(dnsheader::*)(bool)>("setQR", [](dnsheader& dh, bool v) {
 172       dh.qr=v;
 173     });
 174
 175   /* ComboAddress */
 176   g_lua.writeFunction("newCA", [](const std::string& name) { return ComboAddress(name); });
 177   g_lua.writeFunction("newCAFromRaw", [](const std::string& raw, boost::optional<uint16_t> port) {
 178                                         if (raw.size() == 4) {
 179                                           struct sockaddr_in sin4;
 180                                           memset(&sin4, 0, sizeof(sin4));
 181                                           sin4.sin_family = AF_INET;
 182                                           memcpy(&sin4.sin_addr.s_addr, raw.c_str(), raw.size());
 183                                           if (port) {
 184                                             sin4.sin_port = htons(*port);
 185                                           }
 186                                           return ComboAddress(&sin4);
 187                                         }
 188                                         else if (raw.size() == 16) {
 189                                           struct sockaddr_in6 sin6;
 190                                           memset(&sin6, 0, sizeof(sin6));
 191                                           sin6.sin6_family = AF_INET6;
 192                                           memcpy(&sin6.sin6_addr.s6_addr, raw.c_str(), raw.size());
 193                                           if (port) {
 194                                             sin6.sin6_port = htons(*port);
 195                                           }
 196                                           return ComboAddress(&sin6);
 197                                         }
 198                                         return ComboAddress();
 199                                       });
 200   g_lua.registerFunction<string(ComboAddress::*)()>("tostring", [](const ComboAddress& ca) { return ca.toString(); });
 201   g_lua.registerFunction<string(ComboAddress::*)()>("tostringWithPort", [](const ComboAddress& ca) { return ca.toStringWithPort(); });
 202   g_lua.registerFunction<string(ComboAddress::*)()>("toString", [](const ComboAddress& ca) { return ca.toString(); });
 203   g_lua.registerFunction<string(ComboAddress::*)()>("toStringWithPort", [](const ComboAddress& ca) { return ca.toStringWithPort(); });
 204   g_lua.registerFunction<uint16_t(ComboAddress::*)()>("getPort", [](const ComboAddress& ca) { return ntohs(ca.sin4.sin_port); } );
 205   g_lua.registerFunction<void(ComboAddress::*)(unsigned int)>("truncate", [](ComboAddress& ca, unsigned int bits) { ca.truncate(bits); });
 206   g_lua.registerFunction<bool(ComboAddress::*)()>("isIPv4", [](const ComboAddress& ca) { return ca.sin4.sin_family == AF_INET; });
 207   g_lua.registerFunction<bool(ComboAddress::*)()>("isIPv6", [](const ComboAddress& ca) { return ca.sin4.sin_family == AF_INET6; });
 208   g_lua.registerFunction<bool(ComboAddress::*)()>("isMappedIPv4", [](const ComboAddress& ca) { return ca.isMappedIPv4(); });
 209   g_lua.registerFunction<ComboAddress(ComboAddress::*)()>("mapToIPv4", [](const ComboAddress& ca) { return ca.mapToIPv4(); });
 210   g_lua.registerFunction<bool(nmts_t::*)(const ComboAddress&)>("match", [](nmts_t& s, const ComboAddress& ca) { return s.match(ca); });
 211
 212   /* DNSName */
 213   g_lua.registerFunction("isPartOf", &DNSName::isPartOf);
 214   g_lua.registerFunction<bool(DNSName::*)()>("chopOff", [](DNSName&dn ) { return dn.chopOff(); });
 215   g_lua.registerFunction<unsigned int(DNSName::*)()>("countLabels", [](const DNSName& name) { return name.countLabels(); });
 216   g_lua.registerFunction<size_t(DNSName::*)()>("hash", [](const DNSName& name) { return name.hash(); });
 217   g_lua.registerFunction<size_t(DNSName::*)()>("wirelength", [](const DNSName& name) { return name.wirelength(); });
 218   g_lua.registerFunction<string(DNSName::*)()>("tostring", [](const DNSName&dn ) { return dn.toString(); });
 219   g_lua.registerFunction<string(DNSName::*)()>("toString", [](const DNSName&dn ) { return dn.toString(); });
 220   g_lua.writeFunction("newDNSName", [](const std::string& name) { return DNSName(name); });
 221   g_lua.writeFunction("newDNSNameFromRaw", [](const std::string& name) { return DNSName(name.c_str(), name.size(), 0, false); });
 222   g_lua.writeFunction("newSuffixMatchNode", []() { return SuffixMatchNode(); });
 223   g_lua.writeFunction("newDNSNameSet", []() { return DNSNameSet(); });
 224
 225   /* DNSNameSet */
 226   g_lua.registerFunction<string(DNSNameSet::*)()>("toString", [](const DNSNameSet&dns ) { return dns.toString(); });
 227   g_lua.registerFunction<void(DNSNameSet::*)(DNSName&)>("add", [](DNSNameSet& dns, DNSName& dn) { dns.insert(dn); });
 228   g_lua.registerFunction<bool(DNSNameSet::*)(DNSName&)>("check", [](DNSNameSet& dns, DNSName& dn) { return dns.find(dn) != dns.end(); });
 229   g_lua.registerFunction("delete",(size_t (DNSNameSet::*)(const DNSName&)) &DNSNameSet::erase);
 230   g_lua.registerFunction("size",(size_t (DNSNameSet::*)() const) &DNSNameSet::size);
 231   g_lua.registerFunction("clear",(void (DNSNameSet::*)()) &DNSNameSet::clear);
 232   g_lua.registerFunction("empty",(bool (DNSNameSet::*)()) &DNSNameSet::empty);
 233
 234   /* SuffixMatchNode */
 235   g_lua.registerFunction<void (SuffixMatchNode::*)(const boost::variant<DNSName, string, vector<pair<int, DNSName>>, vector<pair<int, string>>> &name)>("add", [](SuffixMatchNode &smn, const boost::variant<DNSName, string, vector<pair<int, DNSName>>, vector<pair<int, string>>> &name) {
 236       if (name.type() == typeid(DNSName)) {
 237           auto n = boost::get<DNSName>(name);
 238           smn.add(n);
 239           return;
 240       }
 241       if (name.type() == typeid(string)) {
 242           auto n = boost::get<string>(name);
 243           smn.add(n);
 244           return;
 245       }
 246       if (name.type() == typeid(vector<pair<int, DNSName>>)) {
 247           auto names = boost::get<vector<pair<int, DNSName>>>(name);
 248           for (auto const n : names) {
 249             smn.add(n.second);
 250           }
 251           return;
 252       }
 253       if (name.type() == typeid(vector<pair<int, string>>)) {
 254           auto names = boost::get<vector<pair<int, string>>>(name);
 255           for (auto const n : names) {
 256             smn.add(n.second);
 257           }
 258           return;
 259       }
 260   });
 261   g_lua.registerFunction("check",(bool (SuffixMatchNode::*)(const DNSName&) const) &SuffixMatchNode::check);
 262
 263   /* Netmask */
 264   g_lua.writeFunction("newNetmask", [](boost::variant<std::string,ComboAddress> s, boost::optional<uint8_t> bits) {
 265     if (s.type() == typeid(ComboAddress)) {
 266       auto ca = boost::get<ComboAddress>(s);
 267       if (bits) {
 268         return Netmask(ca, *bits);
 269       }
 270       return Netmask(ca);
 271     }
 272     else if (s.type() == typeid(std::string)) {
 273       auto str = boost::get<std::string>(s);
 274       return Netmask(str);
 275     }
 276     throw std::runtime_error("Invalid parameter passed to 'newNetmask()'");
 277   });
 278   g_lua.registerFunction("empty", &Netmask::empty);
 279   g_lua.registerFunction("getBits", &Netmask::getBits);
 280   g_lua.registerFunction<ComboAddress(Netmask::*)()>("getNetwork", [](const Netmask& nm) { return nm.getNetwork(); } ); // const reference makes this necessary
 281   g_lua.registerFunction<ComboAddress(Netmask::*)()>("getMaskedNetwork", [](const Netmask& nm) { return nm.getMaskedNetwork(); } );
 282   g_lua.registerFunction("isIpv4", &Netmask::isIPv4);
 283   g_lua.registerFunction("isIPv4", &Netmask::isIPv4);
 284   g_lua.registerFunction("isIpv6", &Netmask::isIPv6);
 285   g_lua.registerFunction("isIPv6", &Netmask::isIPv6);
 286   g_lua.registerFunction("match", (bool (Netmask::*)(const string&) const)&Netmask::match);
 287   g_lua.registerFunction("toString", &Netmask::toString);
 288   g_lua.registerEqFunction(&Netmask::operator==);
 289   g_lua.registerToStringFunction(&Netmask::toString);
 290
 291   /* NetmaskGroup */
 292   g_lua.writeFunction("newNMG", []() { return NetmaskGroup(); });
 293   g_lua.registerFunction<void(NetmaskGroup::*)(const std::string&mask)>("addMask", [](NetmaskGroup&nmg, const std::string& mask)
 294                          {
 295                            nmg.addMask(mask);
 296                          });
 297   g_lua.registerFunction<void(NetmaskGroup::*)(const std::map<ComboAddress,int>& map)>("addMasks", [](NetmaskGroup&nmg, const std::map<ComboAddress,int>& map)
 298                          {
 299                            for (const auto& entry : map) {
 300                              nmg.addMask(Netmask(entry.first));
 301                            }
 302                          });
 303
 304   g_lua.registerFunction("match", (bool (NetmaskGroup::*)(const ComboAddress&) const)&NetmaskGroup::match);
 305   g_lua.registerFunction("size", &NetmaskGroup::size);
 306   g_lua.registerFunction("clear", &NetmaskGroup::clear);
 307   g_lua.registerFunction<string(NetmaskGroup::*)()>("toString", [](const NetmaskGroup& nmg ) { return "NetmaskGroup " + nmg.toString(); });
 308
 309   /* QPSLimiter */
 310   g_lua.writeFunction("newQPSLimiter", [](int rate, int burst) { return QPSLimiter(rate, burst); });
 311   g_lua.registerFunction("check", &QPSLimiter::check);
 312
 313   /* ClientState */
 314   g_lua.registerFunction<std::string(ClientState::*)()>("toString", [](const ClientState& fe) {
 315       setLuaNoSideEffect();
 316       return fe.local.toStringWithPort();
 317     });
 318   g_lua.registerMember("muted", &ClientState::muted);
 319 #ifdef HAVE_EBPF
 320   g_lua.registerFunction<void(ClientState::*)(std::shared_ptr<BPFFilter>)>("attachFilter", [](ClientState& frontend, std::shared_ptr<BPFFilter> bpf) {
 321       if (bpf) {
 322         frontend.attachFilter(bpf);
 323       }
 324     });
 325   g_lua.registerFunction<void(ClientState::*)()>("detachFilter", [](ClientState& frontend) {
 326       frontend.detachFilter();
 327     });
 328 #endif /* HAVE_EBPF */
 329
 330   /* BPF Filter */
 331 #ifdef HAVE_EBPF
 332   g_lua.writeFunction("newBPFFilter", [client](uint32_t maxV4, uint32_t maxV6, uint32_t maxQNames) {
 333       if (client) {
 334         return std::shared_ptr<BPFFilter>(nullptr);
 335       }
 336       return std::make_shared<BPFFilter>(maxV4, maxV6, maxQNames);
 337     });
 338
 339   g_lua.registerFunction<void(std::shared_ptr<BPFFilter>::*)(const ComboAddress& ca)>("block", [](std::shared_ptr<BPFFilter> bpf, const ComboAddress& ca) {
 340       if (bpf) {
 341         return bpf->block(ca);
 342       }
 343     });
 344
 345   g_lua.registerFunction<void(std::shared_ptr<BPFFilter>::*)(const DNSName& qname, boost::optional<uint16_t> qtype)>("blockQName", [](std::shared_ptr<BPFFilter> bpf, const DNSName& qname, boost::optional<uint16_t> qtype) {
 346       if (bpf) {
 347         return bpf->block(qname, qtype ? *qtype : 255);
 348       }
 349     });
 350
 351   g_lua.registerFunction<void(std::shared_ptr<BPFFilter>::*)(const ComboAddress& ca)>("unblock", [](std::shared_ptr<BPFFilter> bpf, const ComboAddress& ca) {
 352       if (bpf) {
 353         return bpf->unblock(ca);
 354       }
 355     });
 356
 357   g_lua.registerFunction<void(std::shared_ptr<BPFFilter>::*)(const DNSName& qname, boost::optional<uint16_t> qtype)>("unblockQName", [](std::shared_ptr<BPFFilter> bpf, const DNSName& qname, boost::optional<uint16_t> qtype) {
 358       if (bpf) {
 359         return bpf->unblock(qname, qtype ? *qtype : 255);
 360       }
 361     });
 362
 363   g_lua.registerFunction<std::string(std::shared_ptr<BPFFilter>::*)()>("getStats", [](const std::shared_ptr<BPFFilter> bpf) {
 364       setLuaNoSideEffect();
 365       std::string res;
 366       if (bpf) {
 367         std::vector<std::pair<ComboAddress, uint64_t> > stats = bpf->getAddrStats();
 368         for (const auto& value : stats) {
 369           if (value.first.sin4.sin_family == AF_INET) {
 370             res += value.first.toString() + ": " + std::to_string(value.second) + "\n";
 371           }
 372           else if (value.first.sin4.sin_family == AF_INET6) {
 373             res += "[" + value.first.toString() + "]: " + std::to_string(value.second) + "\n";
 374           }
 375         }
 376         std::vector<std::tuple<DNSName, uint16_t, uint64_t> > qstats = bpf->getQNameStats();
 377         for (const auto& value : qstats) {
 378           res += std::get<0>(value).toString() + " " + std::to_string(std::get<1>(value)) + ": " + std::to_string(std::get<2>(value)) + "\n";
 379         }
 380       }
 381       return res;
 382     });
 383
 384   g_lua.registerFunction<void(std::shared_ptr<BPFFilter>::*)()>("attachToAllBinds", [](std::shared_ptr<BPFFilter> bpf) {
 385       std::string res;
 386       if (bpf) {
 387         for (const auto& frontend : g_frontends) {
 388           frontend->attachFilter(bpf);
 389         }
 390       }
 391     });
 392
 393     g_lua.writeFunction("newDynBPFFilter", [client](std::shared_ptr<BPFFilter> bpf) {
 394         if (client) {
 395           return std::shared_ptr<DynBPFFilter>(nullptr);
 396         }
 397         return std::make_shared<DynBPFFilter>(bpf);
 398       });
 399
 400     g_lua.registerFunction<void(std::shared_ptr<DynBPFFilter>::*)(const ComboAddress& addr, boost::optional<int> seconds)>("block", [](std::shared_ptr<DynBPFFilter> dbpf, const ComboAddress& addr, boost::optional<int> seconds) {
 401         if (dbpf) {
 402           struct timespec until;
 403           clock_gettime(CLOCK_MONOTONIC, &until);
 404           until.tv_sec += seconds ? *seconds : 10;
 405           dbpf->block(addr, until);
 406         }
 407     });
 408
 409     g_lua.registerFunction<void(std::shared_ptr<DynBPFFilter>::*)()>("purgeExpired", [](std::shared_ptr<DynBPFFilter> dbpf) {
 410         if (dbpf) {
 411           struct timespec now;
 412           clock_gettime(CLOCK_MONOTONIC, &now);
 413           dbpf->purgeExpired(now);
 414         }
 415     });
 416
 417     g_lua.registerFunction<void(std::shared_ptr<DynBPFFilter>::*)(boost::variant<std::string, std::vector<std::pair<int, std::string>>>)>("excludeRange", [](std::shared_ptr<DynBPFFilter> dbpf, boost::variant<std::string, std::vector<std::pair<int, std::string>>> ranges) {
 418       if (ranges.type() == typeid(std::vector<std::pair<int, std::string>>)) {
 419         for (const auto& range : *boost::get<std::vector<std::pair<int, std::string>>>(&ranges)) {
 420           dbpf->excludeRange(Netmask(range.second));
 421         }
 422       }
 423       else {
 424         dbpf->excludeRange(Netmask(*boost::get<std::string>(&ranges)));
 425       }
 426     });
 427
 428     g_lua.registerFunction<void(std::shared_ptr<DynBPFFilter>::*)(boost::variant<std::string, std::vector<std::pair<int, std::string>>>)>("includeRange", [](std::shared_ptr<DynBPFFilter> dbpf, boost::variant<std::string, std::vector<std::pair<int, std::string>>> ranges) {
 429       if (ranges.type() == typeid(std::vector<std::pair<int, std::string>>)) {
 430         for (const auto& range : *boost::get<std::vector<std::pair<int, std::string>>>(&ranges)) {
 431           dbpf->includeRange(Netmask(range.second));
 432         }
 433       }
 434       else {
 435         dbpf->includeRange(Netmask(*boost::get<std::string>(&ranges)));
 436       }
 437     });
 438 #endif /* HAVE_EBPF */
 439
 440   /* EDNSOptionView */
 441   g_lua.registerFunction<size_t(EDNSOptionView::*)()>("count", [](const EDNSOptionView& option) {
 442       return option.values.size();
 443     });
 444   g_lua.registerFunction<std::vector<string>(EDNSOptionView::*)()>("getValues", [] (const EDNSOptionView& option) {
 445     std::vector<string> values;
 446     for (const auto& value : option.values) {
 447       values.push_back(std::string(value.content, value.size));
 448     }
 449     return values;
 450   });
 451
 452   g_lua.writeFunction("newDOHResponseMapEntry", [](const std::string& regex, uint16_t status, const std::string& content, boost::optional<std::map<std::string, std::string>> customHeaders) {
 453     boost::optional<std::vector<std::pair<std::string, std::string>>> headers{boost::none};
 454     if (customHeaders) {
 455       headers = std::vector<std::pair<std::string, std::string>>();
 456       for (const auto& header : *customHeaders) {
 457         headers->push_back({ boost::to_lower_copy(header.first), header.second });
 458       }
 459     }
 460     return std::make_shared<DOHResponseMapEntry>(regex, status, content, headers);
 461   });
 462 }