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, policyfunc_t policy) { return ServerPolicy{name, policy, true};});
  61   g_lua.registerMember("name", &ServerPolicy::name);
  62   g_lua.registerMember("policy", &ServerPolicy::policy);
  63   g_lua.registerMember("isLua", &ServerPolicy::isLua);
  64   g_lua.registerFunction("toString", &ServerPolicy::toString);
  65
  66   g_lua.writeVariable("firstAvailable", ServerPolicy{"firstAvailable", firstAvailable, false});
  67   g_lua.writeVariable("roundrobin", ServerPolicy{"roundrobin", roundrobin, false});
  68   g_lua.writeVariable("wrandom", ServerPolicy{"wrandom", wrandom, false});
  69   g_lua.writeVariable("whashed", ServerPolicy{"whashed", whashed, false});
  70   g_lua.writeVariable("chashed", ServerPolicy{"chashed", chashed, false});
  71   g_lua.writeVariable("leastOutstanding", ServerPolicy{"leastOutstanding", leastOutstanding, false});
  72
  73   /* ServerPool */
  74   g_lua.registerFunction<void(std::shared_ptr<ServerPool>::*)(std::shared_ptr<DNSDistPacketCache>)>("setCache", [](std::shared_ptr<ServerPool> pool, std::shared_ptr<DNSDistPacketCache> cache) {
  75       if (pool) {
  76         pool->packetCache = cache;
  77       }
  78     });
  79   g_lua.registerFunction("getCache", &ServerPool::getCache);
  80   g_lua.registerFunction<void(std::shared_ptr<ServerPool>::*)()>("unsetCache", [](std::shared_ptr<ServerPool> pool) {
  81       if (pool) {
  82         pool->packetCache = nullptr;
  83       }
  84     });
  85   g_lua.registerFunction("getECS", &ServerPool::getECS);
  86   g_lua.registerFunction("setECS", &ServerPool::setECS);
  87
  88   /* DownstreamState */
  89   g_lua.registerFunction<void(DownstreamState::*)(int)>("setQPS", [](DownstreamState& s, int lim) { s.qps = lim ? QPSLimiter(lim, lim) : QPSLimiter(); });
  90   g_lua.registerFunction<void(std::shared_ptr<DownstreamState>::*)(string)>("addPool", [](std::shared_ptr<DownstreamState> s, string pool) {
  91       auto localPools = g_pools.getCopy();
  92       addServerToPool(localPools, pool, s);
  93       g_pools.setState(localPools);
  94       s->pools.insert(pool);
  95     });
  96   g_lua.registerFunction<void(std::shared_ptr<DownstreamState>::*)(string)>("rmPool", [](std::shared_ptr<DownstreamState> s, string pool) {
  97       auto localPools = g_pools.getCopy();
  98       removeServerFromPool(localPools, pool, s);
  99       g_pools.setState(localPools);
 100       s->pools.erase(pool);
 101     });
 102   g_lua.registerFunction<uint64_t(DownstreamState::*)()>("getOutstanding", [](const DownstreamState& s) { return s.outstanding.load(); });
 103   g_lua.registerFunction("isUp", &DownstreamState::isUp);
 104   g_lua.registerFunction("setDown", &DownstreamState::setDown);
 105   g_lua.registerFunction("setUp", &DownstreamState::setUp);
 106   g_lua.registerFunction<void(DownstreamState::*)(boost::optional<bool> newStatus)>("setAuto", [](DownstreamState& s, boost::optional<bool> newStatus) {
 107       if (newStatus) {
 108         s.upStatus = *newStatus;
 109       }
 110       s.setAuto();
 111     });
 112   g_lua.registerFunction("getName", &DownstreamState::getName);
 113   g_lua.registerFunction("getNameWithAddr", &DownstreamState::getNameWithAddr);
 114   g_lua.registerMember("upStatus", &DownstreamState::upStatus);
 115   g_lua.registerMember<int (DownstreamState::*)>("weight",
 116     [](const DownstreamState& s) -> int {return s.weight;},
 117     [](DownstreamState& s, int newWeight) {s.setWeight(newWeight);}
 118   );
 119   g_lua.registerMember("order", &DownstreamState::order);
 120   g_lua.registerMember("name", &DownstreamState::name);
 121
 122   /* dnsheader */
 123   g_lua.registerFunction<void(dnsheader::*)(bool)>("setRD", [](dnsheader& dh, bool v) {
 124       dh.rd=v;
 125     });
 126
 127   g_lua.registerFunction<bool(dnsheader::*)()>("getRD", [](dnsheader& dh) {
 128       return (bool)dh.rd;
 129     });
 130
 131   g_lua.registerFunction<void(dnsheader::*)(bool)>("setCD", [](dnsheader& dh, bool v) {
 132       dh.cd=v;
 133     });
 134
 135   g_lua.registerFunction<bool(dnsheader::*)()>("getCD", [](dnsheader& dh) {
 136       return (bool)dh.cd;
 137     });
 138
 139   g_lua.registerFunction<void(dnsheader::*)(bool)>("setTC", [](dnsheader& dh, bool v) {
 140       dh.tc=v;
 141       if(v) dh.ra = dh.rd; // you'll always need this, otherwise TC=1 gets ignored
 142     });
 143
 144   g_lua.registerFunction<void(dnsheader::*)(bool)>("setQR", [](dnsheader& dh, bool v) {
 145       dh.qr=v;
 146     });
 147
 148   /* ComboAddress */
 149   g_lua.writeFunction("newCA", [](const std::string& name) { return ComboAddress(name); });
 150   g_lua.registerFunction<string(ComboAddress::*)()>("tostring", [](const ComboAddress& ca) { return ca.toString(); });
 151   g_lua.registerFunction<string(ComboAddress::*)()>("tostringWithPort", [](const ComboAddress& ca) { return ca.toStringWithPort(); });
 152   g_lua.registerFunction<string(ComboAddress::*)()>("toString", [](const ComboAddress& ca) { return ca.toString(); });
 153   g_lua.registerFunction<string(ComboAddress::*)()>("toStringWithPort", [](const ComboAddress& ca) { return ca.toStringWithPort(); });
 154   g_lua.registerFunction<uint16_t(ComboAddress::*)()>("getPort", [](const ComboAddress& ca) { return ntohs(ca.sin4.sin_port); } );
 155   g_lua.registerFunction<void(ComboAddress::*)(unsigned int)>("truncate", [](ComboAddress& ca, unsigned int bits) { ca.truncate(bits); });
 156   g_lua.registerFunction<bool(ComboAddress::*)()>("isIPv4", [](const ComboAddress& ca) { return ca.sin4.sin_family == AF_INET; });
 157   g_lua.registerFunction<bool(ComboAddress::*)()>("isIPv6", [](const ComboAddress& ca) { return ca.sin4.sin_family == AF_INET6; });
 158   g_lua.registerFunction<bool(ComboAddress::*)()>("isMappedIPv4", [](const ComboAddress& ca) { return ca.isMappedIPv4(); });
 159   g_lua.registerFunction<ComboAddress(ComboAddress::*)()>("mapToIPv4", [](const ComboAddress& ca) { return ca.mapToIPv4(); });
 160   g_lua.registerFunction<bool(nmts_t::*)(const ComboAddress&)>("match", [](nmts_t& s, const ComboAddress& ca) { return s.match(ca); });
 161
 162   /* DNSName */
 163   g_lua.registerFunction("isPartOf", &DNSName::isPartOf);
 164   g_lua.registerFunction<bool(DNSName::*)()>("chopOff", [](DNSName&dn ) { return dn.chopOff(); });
 165   g_lua.registerFunction<unsigned int(DNSName::*)()>("countLabels", [](const DNSName& name) { return name.countLabels(); });
 166   g_lua.registerFunction<size_t(DNSName::*)()>("wirelength", [](const DNSName& name) { return name.wirelength(); });
 167   g_lua.registerFunction<string(DNSName::*)()>("tostring", [](const DNSName&dn ) { return dn.toString(); });
 168   g_lua.registerFunction<string(DNSName::*)()>("toString", [](const DNSName&dn ) { return dn.toString(); });
 169   g_lua.writeFunction("newDNSName", [](const std::string& name) { return DNSName(name); });
 170   g_lua.writeFunction("newSuffixMatchNode", []() { return SuffixMatchNode(); });
 171   g_lua.writeFunction("newDNSNameSet", []() { return DNSNameSet(); });
 172
 173   /* DNSNameSet */
 174   g_lua.registerFunction<string(DNSNameSet::*)()>("toString", [](const DNSNameSet&dns ) { return dns.toString(); });
 175   g_lua.registerFunction<void(DNSNameSet::*)(DNSName&)>("add", [](DNSNameSet& dns, DNSName& dn) { dns.insert(dn); });
 176   g_lua.registerFunction<bool(DNSNameSet::*)(DNSName&)>("check", [](DNSNameSet& dns, DNSName& dn) { return dns.find(dn) != dns.end(); });
 177   g_lua.registerFunction("delete",(size_t (DNSNameSet::*)(const DNSName&)) &DNSNameSet::erase);
 178   g_lua.registerFunction("size",(size_t (DNSNameSet::*)() const) &DNSNameSet::size);
 179   g_lua.registerFunction("clear",(void (DNSNameSet::*)()) &DNSNameSet::clear);
 180   g_lua.registerFunction("empty",(bool (DNSNameSet::*)()) &DNSNameSet::empty);
 181
 182   /* SuffixMatchNode */
 183   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) {
 184       if (name.type() == typeid(DNSName)) {
 185           auto n = boost::get<DNSName>(name);
 186           smn.add(n);
 187           return;
 188       }
 189       if (name.type() == typeid(string)) {
 190           auto n = boost::get<string>(name);
 191           smn.add(n);
 192           return;
 193       }
 194       if (name.type() == typeid(vector<pair<int, DNSName>>)) {
 195           auto names = boost::get<vector<pair<int, DNSName>>>(name);
 196           for (auto const n : names) {
 197             smn.add(n.second);
 198           }
 199           return;
 200       }
 201       if (name.type() == typeid(vector<pair<int, string>>)) {
 202           auto names = boost::get<vector<pair<int, string>>>(name);
 203           for (auto const n : names) {
 204             smn.add(n.second);
 205           }
 206           return;
 207       }
 208   });
 209   g_lua.registerFunction("check",(bool (SuffixMatchNode::*)(const DNSName&) const) &SuffixMatchNode::check);
 210
 211   /* NetmaskGroup */
 212   g_lua.writeFunction("newNMG", []() { return NetmaskGroup(); });
 213   g_lua.registerFunction<void(NetmaskGroup::*)(const std::string&mask)>("addMask", [](NetmaskGroup&nmg, const std::string& mask)
 214                          {
 215                            nmg.addMask(mask);
 216                          });
 217   g_lua.registerFunction<void(NetmaskGroup::*)(const std::map<ComboAddress,int>& map)>("addMasks", [](NetmaskGroup&nmg, const std::map<ComboAddress,int>& map)
 218                          {
 219                            for (const auto& entry : map) {
 220                              nmg.addMask(Netmask(entry.first));
 221                            }
 222                          });
 223
 224   g_lua.registerFunction("match", (bool (NetmaskGroup::*)(const ComboAddress&) const)&NetmaskGroup::match);
 225   g_lua.registerFunction("size", &NetmaskGroup::size);
 226   g_lua.registerFunction("clear", &NetmaskGroup::clear);
 227   g_lua.registerFunction<string(NetmaskGroup::*)()>("toString", [](const NetmaskGroup& nmg ) { return "NetmaskGroup " + nmg.toString(); });
 228
 229   /* QPSLimiter */
 230   g_lua.writeFunction("newQPSLimiter", [](int rate, int burst) { return QPSLimiter(rate, burst); });
 231   g_lua.registerFunction("check", &QPSLimiter::check);
 232
 233   /* ClientState */
 234   g_lua.registerFunction<std::string(ClientState::*)()>("toString", [](const ClientState& fe) {
 235       setLuaNoSideEffect();
 236       return fe.local.toStringWithPort();
 237     });
 238   g_lua.registerMember("muted", &ClientState::muted);
 239 #ifdef HAVE_EBPF
 240   g_lua.registerFunction<void(ClientState::*)(std::shared_ptr<BPFFilter>)>("attachFilter", [](ClientState& frontend, std::shared_ptr<BPFFilter> bpf) {
 241       if (bpf) {
 242         frontend.attachFilter(bpf);
 243       }
 244     });
 245   g_lua.registerFunction<void(ClientState::*)()>("detachFilter", [](ClientState& frontend) {
 246       frontend.detachFilter();
 247     });
 248 #endif /* HAVE_EBPF */
 249
 250   /* BPF Filter */
 251 #ifdef HAVE_EBPF
 252   g_lua.writeFunction("newBPFFilter", [client](uint32_t maxV4, uint32_t maxV6, uint32_t maxQNames) {
 253       if (client) {
 254         return std::shared_ptr<BPFFilter>(nullptr);
 255       }
 256       return std::make_shared<BPFFilter>(maxV4, maxV6, maxQNames);
 257     });
 258
 259   g_lua.registerFunction<void(std::shared_ptr<BPFFilter>::*)(const ComboAddress& ca)>("block", [](std::shared_ptr<BPFFilter> bpf, const ComboAddress& ca) {
 260       if (bpf) {
 261         return bpf->block(ca);
 262       }
 263     });
 264
 265   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) {
 266       if (bpf) {
 267         return bpf->block(qname, qtype ? *qtype : 255);
 268       }
 269     });
 270
 271   g_lua.registerFunction<void(std::shared_ptr<BPFFilter>::*)(const ComboAddress& ca)>("unblock", [](std::shared_ptr<BPFFilter> bpf, const ComboAddress& ca) {
 272       if (bpf) {
 273         return bpf->unblock(ca);
 274       }
 275     });
 276
 277   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) {
 278       if (bpf) {
 279         return bpf->unblock(qname, qtype ? *qtype : 255);
 280       }
 281     });
 282
 283   g_lua.registerFunction<std::string(std::shared_ptr<BPFFilter>::*)()>("getStats", [](const std::shared_ptr<BPFFilter> bpf) {
 284       setLuaNoSideEffect();
 285       std::string res;
 286       if (bpf) {
 287         std::vector<std::pair<ComboAddress, uint64_t> > stats = bpf->getAddrStats();
 288         for (const auto& value : stats) {
 289           if (value.first.sin4.sin_family == AF_INET) {
 290             res += value.first.toString() + ": " + std::to_string(value.second) + "\n";
 291           }
 292           else if (value.first.sin4.sin_family == AF_INET6) {
 293             res += "[" + value.first.toString() + "]: " + std::to_string(value.second) + "\n";
 294           }
 295         }
 296         std::vector<std::tuple<DNSName, uint16_t, uint64_t> > qstats = bpf->getQNameStats();
 297         for (const auto& value : qstats) {
 298           res += std::get<0>(value).toString() + " " + std::to_string(std::get<1>(value)) + ": " + std::to_string(std::get<2>(value)) + "\n";
 299         }
 300       }
 301       return res;
 302     });
 303
 304   g_lua.registerFunction<void(std::shared_ptr<BPFFilter>::*)()>("attachToAllBinds", [](std::shared_ptr<BPFFilter> bpf) {
 305       std::string res;
 306       if (bpf) {
 307         for (const auto& frontend : g_frontends) {
 308           frontend->attachFilter(bpf);
 309         }
 310       }
 311     });
 312
 313     g_lua.writeFunction("newDynBPFFilter", [client](std::shared_ptr<BPFFilter> bpf) {
 314         if (client) {
 315           return std::shared_ptr<DynBPFFilter>(nullptr);
 316         }
 317         return std::make_shared<DynBPFFilter>(bpf);
 318       });
 319
 320     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) {
 321         if (dbpf) {
 322           struct timespec until;
 323           clock_gettime(CLOCK_MONOTONIC, &until);
 324           until.tv_sec += seconds ? *seconds : 10;
 325           dbpf->block(addr, until);
 326         }
 327     });
 328
 329     g_lua.registerFunction<void(std::shared_ptr<DynBPFFilter>::*)()>("purgeExpired", [](std::shared_ptr<DynBPFFilter> dbpf) {
 330         if (dbpf) {
 331           struct timespec now;
 332           clock_gettime(CLOCK_MONOTONIC, &now);
 333           dbpf->purgeExpired(now);
 334         }
 335     });
 336
 337     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) {
 338       if (ranges.type() == typeid(std::vector<std::pair<int, std::string>>)) {
 339         for (const auto& range : *boost::get<std::vector<std::pair<int, std::string>>>(&ranges)) {
 340           dbpf->excludeRange(Netmask(range.second));
 341         }
 342       }
 343       else {
 344         dbpf->excludeRange(Netmask(*boost::get<std::string>(&ranges)));
 345       }
 346     });
 347
 348     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) {
 349       if (ranges.type() == typeid(std::vector<std::pair<int, std::string>>)) {
 350         for (const auto& range : *boost::get<std::vector<std::pair<int, std::string>>>(&ranges)) {
 351           dbpf->includeRange(Netmask(range.second));
 352         }
 353       }
 354       else {
 355         dbpf->includeRange(Netmask(*boost::get<std::string>(&ranges)));
 356       }
 357     });
 358 #endif /* HAVE_EBPF */
 359
 360   /* EDNSOptionView */
 361   g_lua.registerFunction<size_t(EDNSOptionView::*)()>("count", [](const EDNSOptionView& option) {
 362       return option.values.size();
 363     });
 364   g_lua.registerFunction<std::vector<string>(EDNSOptionView::*)()>("getValues", [] (const EDNSOptionView& option) {
 365     std::vector<string> values;
 366     for (const auto& value : option.values) {
 367       values.push_back(std::string(value.content, value.size));
 368     }
 369     return values;
 370   });
 371
 372   g_lua.writeFunction("newDOHResponseMapEntry", [](const std::string& regex, uint16_t status, const std::string& content, boost::optional<std::map<std::string, std::string>> customHeaders) {
 373     boost::optional<std::vector<std::pair<std::string, std::string>>> headers{boost::none};
 374     if (customHeaders) {
 375       headers = std::vector<std::pair<std::string, std::string>>();
 376       for (const auto& header : *customHeaders) {
 377         headers->push_back({ header.first, header.second });
 378       }
 379     }
 380     return std::make_shared<DOHResponseMapEntry>(regex, status, content, headers);
 381   });
 382 }