pdns/lua-recursor4.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 "lua-recursor4.hh"
  23 #include <fstream>
  24 #include "logger.hh"
  25 #include "dnsparser.hh"
  26 #include "syncres.hh"
  27 #include "namespaces.hh"
  28 #include "rec_channel.hh"
  29 #include "ednsoptions.hh"
  30 #include "ednssubnet.hh"
  31 #include "filterpo.hh"
  32 #include "rec-snmp.hh"
  33 #include <unordered_set>
  34
  35 RecursorLua4::RecursorLua4() { prepareContext(); }
  36
  37 boost::optional<dnsheader> RecursorLua4::DNSQuestion::getDH() const
  38 {
  39   if (dh)
  40     return *dh;
  41   return boost::optional<dnsheader>();
  42 }
  43
  44 vector<string> RecursorLua4::DNSQuestion::getEDNSFlags() const
  45 {
  46   vector<string> ret;
  47   if (ednsFlags) {
  48     if (*ednsFlags & EDNSOpts::DNSSECOK)
  49       ret.push_back("DO");
  50   }
  51   return ret;
  52 }
  53
  54 bool RecursorLua4::DNSQuestion::getEDNSFlag(string flag) const
  55 {
  56   if (ednsFlags) {
  57     if (flag == "DO" && (*ednsFlags & EDNSOpts::DNSSECOK))
  58       return true;
  59   }
  60   return false;
  61 }
  62
  63 vector<pair<uint16_t, string> > RecursorLua4::DNSQuestion::getEDNSOptions() const
  64 {
  65   if(ednsOptions)
  66     return *ednsOptions;
  67   else
  68     return vector<pair<uint16_t,string>>();
  69 }
  70
  71 boost::optional<string>  RecursorLua4::DNSQuestion::getEDNSOption(uint16_t code) const
  72 {
  73   if(ednsOptions)
  74     for(const auto& o : *ednsOptions)
  75       if(o.first==code)
  76         return o.second;
  77
  78   return boost::optional<string>();
  79 }
  80
  81 boost::optional<Netmask>  RecursorLua4::DNSQuestion::getEDNSSubnet() const
  82 {
  83   if(ednsOptions) {
  84     for(const auto& o : *ednsOptions) {
  85       if(o.first==EDNSOptionCode::ECS) {
  86         EDNSSubnetOpts eso;
  87         if(getEDNSSubnetOptsFromString(o.second, &eso))
  88           return eso.source;
  89         else
  90           break;
  91       }
  92     }
  93   }
  94   return boost::optional<Netmask>();
  95 }
  96
  97 std::vector<std::pair<int, ProxyProtocolValue>> RecursorLua4::DNSQuestion::getProxyProtocolValues() const
  98 {
  99   std::vector<std::pair<int, ProxyProtocolValue>> result;
 100   if (proxyProtocolValues) {
 101     result.reserve(proxyProtocolValues->size());
 102
 103     int idx = 1;
 104     for (const auto& value: *proxyProtocolValues) {
 105       result.push_back({ idx++, value });
 106     }
 107   }
 108
 109   return result;
 110 }
 111
 112 vector<pair<int, DNSRecord> > RecursorLua4::DNSQuestion::getRecords() const
 113 {
 114   vector<pair<int, DNSRecord> > ret;
 115   int num=1;
 116   for(const auto& r : records) {
 117     ret.push_back({num++, r});
 118   }
 119   return ret;
 120 }
 121 void RecursorLua4::DNSQuestion::setRecords(const vector<pair<int, DNSRecord> >& recs)
 122 {
 123   records.clear();
 124   for(const auto& p : recs) {
 125     records.push_back(p.second);
 126   }
 127 }
 128
 129 void RecursorLua4::DNSQuestion::addRecord(uint16_t type, const std::string& content, DNSResourceRecord::Place place, boost::optional<int> ttl, boost::optional<string> name)
 130 {
 131   DNSRecord dr;
 132   dr.d_name=name ? DNSName(*name) : qname;
 133   dr.d_ttl=ttl.get_value_or(3600);
 134   dr.d_type = type;
 135   dr.d_place = place;
 136   dr.d_content = DNSRecordContent::mastermake(type, 1, content);
 137   records.push_back(dr);
 138 }
 139
 140 void RecursorLua4::DNSQuestion::addAnswer(uint16_t type, const std::string& content, boost::optional<int> ttl, boost::optional<string> name)
 141 {
 142   addRecord(type, content, DNSResourceRecord::ANSWER, ttl, name);
 143 }
 144
 145 struct DynMetric
 146 {
 147   std::atomic<unsigned long>* ptr;
 148   void inc() { (*ptr)++; }
 149   void incBy(unsigned int by) { (*ptr)+= by; }
 150   unsigned long get() { return *ptr; }
 151   void set(unsigned long val) { *ptr =val; }
 152 };
 153
 154 void RecursorLua4::postPrepareContext()
 155 {
 156   d_lw->registerMember<const DNSName (DNSQuestion::*)>("qname", [](const DNSQuestion& dq) -> const DNSName& { return dq.qname; }, [](DNSQuestion& dq, const DNSName& newName) { (void) newName; });
 157   d_lw->registerMember<uint16_t (DNSQuestion::*)>("qtype", [](const DNSQuestion& dq) -> uint16_t { return dq.qtype; }, [](DNSQuestion& dq, uint16_t newType) { (void) newType; });
 158   d_lw->registerMember<bool (DNSQuestion::*)>("isTcp", [](const DNSQuestion& dq) -> bool { return dq.isTcp; }, [](DNSQuestion& dq, bool newTcp) { (void) newTcp; });
 159   d_lw->registerMember<const ComboAddress (DNSQuestion::*)>("localaddr", [](const DNSQuestion& dq) -> const ComboAddress& { return dq.local; }, [](DNSQuestion& dq, const ComboAddress& newLocal) { (void) newLocal; });
 160   d_lw->registerMember<const ComboAddress (DNSQuestion::*)>("remoteaddr", [](const DNSQuestion& dq) -> const ComboAddress& { return dq.remote; }, [](DNSQuestion& dq, const ComboAddress& newRemote) { (void) newRemote; });
 161   d_lw->registerMember<vState (DNSQuestion::*)>("validationState", [](const DNSQuestion& dq) -> vState { return dq.validationState; }, [](DNSQuestion& dq, vState newState) { (void) newState; });
 162
 163   d_lw->registerMember<bool (DNSQuestion::*)>("variable", [](const DNSQuestion& dq) -> bool { return dq.variable; }, [](DNSQuestion& dq, bool newVariable) { dq.variable = newVariable; });
 164   d_lw->registerMember<bool (DNSQuestion::*)>("wantsRPZ", [](const DNSQuestion& dq) -> bool { return dq.wantsRPZ; }, [](DNSQuestion& dq, bool newWantsRPZ) { dq.wantsRPZ = newWantsRPZ; });
 165   d_lw->registerMember<bool (DNSQuestion::*)>("logResponse", [](const DNSQuestion& dq) -> bool { return dq.logResponse; }, [](DNSQuestion& dq, bool newLogResponse) { dq.logResponse = newLogResponse; });
 166
 167   d_lw->registerMember("rcode", &DNSQuestion::rcode);
 168   d_lw->registerMember("tag", &DNSQuestion::tag);
 169   d_lw->registerMember("requestorId", &DNSQuestion::requestorId);
 170   d_lw->registerMember("deviceId", &DNSQuestion::deviceId);
 171   d_lw->registerMember("deviceName", &DNSQuestion::deviceName);
 172   d_lw->registerMember("followupFunction", &DNSQuestion::followupFunction);
 173   d_lw->registerMember("followupPrefix", &DNSQuestion::followupPrefix);
 174   d_lw->registerMember("followupName", &DNSQuestion::followupName);
 175   d_lw->registerMember("data", &DNSQuestion::data);
 176   d_lw->registerMember("udpQuery", &DNSQuestion::udpQuery);
 177   d_lw->registerMember("udpAnswer", &DNSQuestion::udpAnswer);
 178   d_lw->registerMember("udpQueryDest", &DNSQuestion::udpQueryDest);
 179   d_lw->registerMember("udpCallback", &DNSQuestion::udpCallback);
 180   d_lw->registerMember("appliedPolicy", &DNSQuestion::appliedPolicy);
 181   d_lw->registerMember<DNSFilterEngine::Policy, std::string>("policyName",
 182     [](const DNSFilterEngine::Policy& pol) -> std::string {
 183       return pol.getName();
 184     },
 185     [](DNSFilterEngine::Policy& pol, const std::string& name) {
 186       pol.setName(name);
 187     });
 188   d_lw->registerMember("policyKind", &DNSFilterEngine::Policy::d_kind);
 189   d_lw->registerMember("policyType", &DNSFilterEngine::Policy::d_type);
 190   d_lw->registerMember("policyTTL", &DNSFilterEngine::Policy::d_ttl);
 191   d_lw->registerMember<DNSFilterEngine::Policy, std::string>("policyCustom",
 192     [](const DNSFilterEngine::Policy& pol) -> std::string {
 193       std::string result;
 194       if (pol.d_kind != DNSFilterEngine::PolicyKind::Custom) {
 195         return result;
 196       }
 197
 198       for (const auto& dr : pol.d_custom) {
 199         if (!result.empty()) {
 200           result += "\n";
 201         }
 202         result += dr->getZoneRepresentation();
 203       }
 204
 205       return result;
 206     },
 207     [](DNSFilterEngine::Policy& pol, const std::string& content) {
 208       // Only CNAMES for now, when we ever add a d_custom_type, there will be pain
 209       pol.d_custom.clear();
 210       pol.d_custom.push_back(DNSRecordContent::mastermake(QType::CNAME, QClass::IN, content));
 211     }
 212   );
 213   d_lw->registerFunction("getDH", &DNSQuestion::getDH);
 214   d_lw->registerFunction("getEDNSOptions", &DNSQuestion::getEDNSOptions);
 215   d_lw->registerFunction("getEDNSOption", &DNSQuestion::getEDNSOption);
 216   d_lw->registerFunction("getEDNSSubnet", &DNSQuestion::getEDNSSubnet);
 217   d_lw->registerFunction("getProxyProtocolValues", &DNSQuestion::getProxyProtocolValues);
 218   d_lw->registerFunction("getEDNSFlags", &DNSQuestion::getEDNSFlags);
 219   d_lw->registerFunction("getEDNSFlag", &DNSQuestion::getEDNSFlag);
 220   d_lw->registerMember("name", &DNSRecord::d_name);
 221   d_lw->registerMember("type", &DNSRecord::d_type);
 222   d_lw->registerMember("ttl", &DNSRecord::d_ttl);
 223   d_lw->registerMember("place", &DNSRecord::d_place);
 224
 225   d_lw->registerMember("size", &EDNSOptionViewValue::size);
 226   d_lw->registerFunction<std::string(EDNSOptionViewValue::*)()>("getContent", [](const EDNSOptionViewValue& value) { return std::string(value.content, value.size); });
 227   d_lw->registerFunction<size_t(EDNSOptionView::*)()>("count", [](const EDNSOptionView& option) { return option.values.size(); });
 228   d_lw->registerFunction<std::vector<string>(EDNSOptionView::*)()>("getValues", [] (const EDNSOptionView& option) {
 229       std::vector<string> values;
 230       for (const auto& value : option.values) {
 231         values.push_back(std::string(value.content, value.size));
 232       }
 233       return values;
 234     });
 235
 236   /* pre 4.2 API compatibility, when we had only one value for a given EDNS option */
 237   d_lw->registerMember<uint16_t(EDNSOptionView::*)>("size", [](const EDNSOptionView& option) -> uint16_t {
 238       uint16_t result = 0;
 239
 240       if (!option.values.empty()) {
 241         result = option.values.at(0).size;
 242       }
 243       return result;
 244     },
 245     [](EDNSOptionView& option, uint16_t newSize) { (void) newSize; });
 246   d_lw->registerFunction<std::string(EDNSOptionView::*)()>("getContent", [](const EDNSOptionView& option) {
 247       if (option.values.empty()) {
 248         return std::string();
 249       }
 250       return std::string(option.values.at(0).content, option.values.at(0).size); });
 251
 252   d_lw->registerFunction<string(DNSRecord::*)()>("getContent", [](const DNSRecord& dr) { return dr.d_content->getZoneRepresentation(); });
 253   d_lw->registerFunction<boost::optional<ComboAddress>(DNSRecord::*)()>("getCA", [](const DNSRecord& dr) {
 254       boost::optional<ComboAddress> ret;
 255
 256       if(auto rec = std::dynamic_pointer_cast<ARecordContent>(dr.d_content))
 257         ret=rec->getCA(53);
 258       else if(auto aaaarec = std::dynamic_pointer_cast<AAAARecordContent>(dr.d_content))
 259         ret=aaaarec->getCA(53);
 260       return ret;
 261     });
 262
 263   d_lw->registerFunction<const ProxyProtocolValue, std::string()>("getContent", [](const ProxyProtocolValue& value) { return value.content; });
 264   d_lw->registerFunction<const ProxyProtocolValue, uint8_t()>("getType", [](const ProxyProtocolValue& value) { return value.type; });
 265
 266   d_lw->registerFunction<void(DNSRecord::*)(const std::string&)>("changeContent", [](DNSRecord& dr, const std::string& newContent) { dr.d_content = DNSRecordContent::mastermake(dr.d_type, 1, newContent); });
 267   d_lw->registerFunction("addAnswer", &DNSQuestion::addAnswer);
 268   d_lw->registerFunction("addRecord", &DNSQuestion::addRecord);
 269   d_lw->registerFunction("getRecords", &DNSQuestion::getRecords);
 270   d_lw->registerFunction("setRecords", &DNSQuestion::setRecords);
 271
 272   d_lw->registerFunction<void(DNSQuestion::*)(const std::string&)>("addPolicyTag", [](DNSQuestion& dq, const std::string& tag) { if (dq.policyTags) { dq.policyTags->insert(tag); } });
 273   d_lw->registerFunction<void(DNSQuestion::*)(const std::vector<std::pair<int, std::string> >&)>("setPolicyTags", [](DNSQuestion& dq, const std::vector<std::pair<int, std::string> >& tags) {
 274       if (dq.policyTags) {
 275         dq.policyTags->clear();
 276         dq.policyTags->reserve(tags.size());
 277         for (const auto& tag : tags) {
 278           dq.policyTags->insert(tag.second);
 279         }
 280       }
 281     });
 282   d_lw->registerFunction<std::vector<std::pair<int, std::string> >(DNSQuestion::*)()>("getPolicyTags", [](const DNSQuestion& dq) {
 283       std::vector<std::pair<int, std::string> > ret;
 284       if (dq.policyTags) {
 285         int count = 1;
 286         ret.reserve(dq.policyTags->size());
 287         for (const auto& tag : *dq.policyTags) {
 288           ret.push_back({count++, tag});
 289         }
 290       }
 291       return ret;
 292     });
 293
 294   d_lw->registerFunction<void(DNSQuestion::*)(const std::string&)>("discardPolicy", [](DNSQuestion& dq, const std::string& policy) {
 295       if (dq.discardedPolicies) {
 296         (*dq.discardedPolicies)[policy] = true;
 297       }
 298     });
 299
 300   d_lw->writeFunction("newDS", []() { return SuffixMatchNode(); });
 301   d_lw->registerFunction<void(SuffixMatchNode::*)(boost::variant<string,DNSName, vector<pair<unsigned int,string> > >)>(
 302     "add",
 303     [](SuffixMatchNode&smn, const boost::variant<string,DNSName,vector<pair<unsigned int,string> > >& in){
 304       try {
 305         if(auto s = boost::get<string>(&in)) {
 306           smn.add(DNSName(*s));
 307         }
 308         else if(auto v = boost::get<vector<pair<unsigned int, string> > >(&in)) {
 309           for(const auto& entry : *v)
 310             smn.add(DNSName(entry.second));
 311         }
 312         else {
 313           smn.add(boost::get<DNSName>(in));
 314         }
 315       }
 316       catch(std::exception& e) {
 317         g_log <<Logger::Error<<e.what()<<endl;
 318       }
 319     }
 320   );
 321
 322   d_lw->registerFunction("check",(bool (SuffixMatchNode::*)(const DNSName&) const) &SuffixMatchNode::check);
 323   d_lw->registerFunction("toString",(string (SuffixMatchNode::*)() const) &SuffixMatchNode::toString);
 324
 325   d_pd.push_back({"policykinds", in_t {
 326     {"NoAction", (int)DNSFilterEngine::PolicyKind::NoAction},
 327     {"Drop",     (int)DNSFilterEngine::PolicyKind::Drop    },
 328     {"NXDOMAIN", (int)DNSFilterEngine::PolicyKind::NXDOMAIN},
 329     {"NODATA",   (int)DNSFilterEngine::PolicyKind::NODATA  },
 330     {"Truncate", (int)DNSFilterEngine::PolicyKind::Truncate},
 331     {"Custom",   (int)DNSFilterEngine::PolicyKind::Custom  }
 332     }});
 333
 334   for(const auto& n : QType::names)
 335     d_pd.push_back({n.first, n.second});
 336
 337   d_pd.push_back({"validationstates", in_t{
 338         {"Indeterminate", Indeterminate },
 339         {"Bogus", Bogus },
 340         {"Insecure", Insecure },
 341         {"Secure", Secure },
 342   }});
 343
 344   d_pd.push_back({"now", &g_now});
 345
 346   d_lw->writeFunction("getMetric", [](const std::string& str) {
 347       return DynMetric{getDynMetric(str)};
 348     });
 349
 350   d_lw->registerFunction("inc", &DynMetric::inc);
 351   d_lw->registerFunction("incBy", &DynMetric::incBy);
 352   d_lw->registerFunction("set", &DynMetric::set);
 353   d_lw->registerFunction("get", &DynMetric::get);
 354
 355   d_lw->writeFunction("getStat", [](const std::string& str) {
 356       uint64_t result = 0;
 357       optional<uint64_t> value = getStatByName(str);
 358       if (value) {
 359         result = *value;
 360       }
 361       return result;
 362     });
 363
 364   d_lw->writeFunction("getRecursorThreadId", []() {
 365       return getRecursorThreadId();
 366     });
 367
 368   d_lw->writeFunction("sendCustomSNMPTrap", [](const std::string& str) {
 369       if (g_snmpAgent) {
 370         g_snmpAgent->sendCustomTrap(str);
 371       }
 372     });
 373
 374   d_lw->writeFunction("getregisteredname", [](const DNSName &dname) {
 375       return getRegisteredName(dname);
 376   });
 377 }
 378
 379 void RecursorLua4::postLoad() {
 380   d_prerpz = d_lw->readVariable<boost::optional<luacall_t>>("prerpz").get_value_or(0);
 381   d_preresolve = d_lw->readVariable<boost::optional<luacall_t>>("preresolve").get_value_or(0);
 382   d_nodata = d_lw->readVariable<boost::optional<luacall_t>>("nodata").get_value_or(0);
 383   d_nxdomain = d_lw->readVariable<boost::optional<luacall_t>>("nxdomain").get_value_or(0);
 384   d_postresolve = d_lw->readVariable<boost::optional<luacall_t>>("postresolve").get_value_or(0);
 385   d_preoutquery = d_lw->readVariable<boost::optional<luacall_t>>("preoutquery").get_value_or(0);
 386   d_maintenance = d_lw->readVariable<boost::optional<luamaintenance_t>>("maintenance").get_value_or(0);
 387
 388   d_ipfilter = d_lw->readVariable<boost::optional<ipfilter_t>>("ipfilter").get_value_or(0);
 389   d_gettag = d_lw->readVariable<boost::optional<gettag_t>>("gettag").get_value_or(0);
 390   d_gettag_ffi = d_lw->readVariable<boost::optional<gettag_ffi_t>>("gettag_ffi").get_value_or(0);
 391 }
 392
 393 void RecursorLua4::getFeatures(Features & features) {
 394   // Add key-values pairs below.
 395   // Make sure you add string values explicitly converted to string.
 396   // e.g. features.push_back(make_pair("somekey", string("stringvalue"));
 397   // Both int and double end up as a lua number type.
 398    features.push_back(make_pair("PR8001_devicename", true));
 399 }
 400
 401 void RecursorLua4::maintenance() const
 402 {
 403   if (d_maintenance) {
 404     d_maintenance();
 405   }
 406 }
 407
 408 bool RecursorLua4::prerpz(DNSQuestion& dq, int& ret) const
 409 {
 410   return genhook(d_prerpz, dq, ret);
 411 }
 412
 413 bool RecursorLua4::preresolve(DNSQuestion& dq, int& ret) const
 414 {
 415   return genhook(d_preresolve, dq, ret);
 416 }
 417
 418 bool RecursorLua4::nxdomain(DNSQuestion& dq, int& ret) const
 419 {
 420   return genhook(d_nxdomain, dq, ret);
 421 }
 422
 423 bool RecursorLua4::nodata(DNSQuestion& dq, int& ret) const
 424 {
 425   return genhook(d_nodata, dq, ret);
 426 }
 427
 428 bool RecursorLua4::postresolve(DNSQuestion& dq, int& ret) const
 429 {
 430   return genhook(d_postresolve, dq, ret);
 431 }
 432
 433 bool RecursorLua4::preoutquery(const ComboAddress& ns, const ComboAddress& requestor, const DNSName& query, const QType& qtype, bool isTcp, vector<DNSRecord>& res, int& ret) const
 434 {
 435   bool variableAnswer = false;
 436   bool wantsRPZ = false;
 437   bool logQuery = false;
 438   RecursorLua4::DNSQuestion dq(ns, requestor, query, qtype.getCode(), isTcp, variableAnswer, wantsRPZ, logQuery);
 439   dq.currentRecords = &res;
 440
 441   return genhook(d_preoutquery, dq, ret);
 442 }
 443
 444 bool RecursorLua4::ipfilter(const ComboAddress& remote, const ComboAddress& local, const struct dnsheader& dh) const
 445 {
 446   if(d_ipfilter)
 447     return d_ipfilter(remote, local, dh);
 448   return false; // don't block
 449 }
 450
 451 unsigned int RecursorLua4::gettag(const ComboAddress& remote, const Netmask& ednssubnet, const ComboAddress& local, const DNSName& qname, uint16_t qtype, std::unordered_set<std::string>* policyTags, LuaContext::LuaObject& data, const EDNSOptionViewMap& ednsOptions, bool tcp, std::string& requestorId, std::string& deviceId, std::string& deviceName, const std::vector<ProxyProtocolValue>& proxyProtocolValues) const
 452 {
 453   if(d_gettag) {
 454     std::vector<std::pair<int, const ProxyProtocolValue*>> proxyProtocolValuesMap;
 455     proxyProtocolValuesMap.reserve(proxyProtocolValues.size());
 456     int num = 1;
 457     for (const auto& value : proxyProtocolValues) {
 458       proxyProtocolValuesMap.emplace_back(num++, &value);
 459     }
 460
 461     auto ret = d_gettag(remote, ednssubnet, local, qname, qtype, ednsOptions, tcp, proxyProtocolValuesMap);
 462
 463     if (policyTags) {
 464       const auto& tags = std::get<1>(ret);
 465       if (tags) {
 466         policyTags->reserve(policyTags->size() + tags->size());
 467         for (const auto& tag : *tags) {
 468           policyTags->insert(tag.second);
 469         }
 470       }
 471     }
 472     const auto dataret = std::get<2>(ret);
 473     if (dataret) {
 474       data = *dataret;
 475     }
 476     const auto reqIdret = std::get<3>(ret);
 477     if (reqIdret) {
 478       requestorId = *reqIdret;
 479     }
 480     const auto deviceIdret = std::get<4>(ret);
 481     if (deviceIdret) {
 482       deviceId = *deviceIdret;
 483     }
 484
 485     const auto deviceNameret = std::get<5>(ret);
 486     if (deviceNameret) {
 487       deviceName = *deviceNameret;
 488     }
 489     return std::get<0>(ret);
 490   }
 491   return 0;
 492 }
 493
 494 struct pdns_ffi_param
 495 {
 496 public:
 497   pdns_ffi_param(const DNSName& qname_, uint16_t qtype_, const ComboAddress& local_, const ComboAddress& remote_, const Netmask& ednssubnet_, std::unordered_set<std::string>& policyTags_, std::vector<DNSRecord>& records_, const EDNSOptionViewMap& ednsOptions_, const std::vector<ProxyProtocolValue>& proxyProtocolValues_, std::string& requestorId_, std::string& deviceId_, std::string& deviceName_, boost::optional<int>& rcode_, uint32_t& ttlCap_, bool& variable_, bool tcp_, bool& logQuery_, bool& logResponse_, bool& followCNAMERecords_): qname(qname_), local(local_), remote(remote_), ednssubnet(ednssubnet_), policyTags(policyTags_), records(records_), ednsOptions(ednsOptions_), proxyProtocolValues(proxyProtocolValues_), requestorId(requestorId_), deviceId(deviceId_), deviceName(deviceName_), rcode(rcode_), ttlCap(ttlCap_), variable(variable_), logQuery(logQuery_), logResponse(logResponse_), followCNAMERecords(followCNAMERecords_), qtype(qtype_), tcp(tcp_)
 498   {
 499   }
 500
 501   std::unique_ptr<std::string> qnameStr{nullptr};
 502   std::unique_ptr<std::string> localStr{nullptr};
 503   std::unique_ptr<std::string> remoteStr{nullptr};
 504   std::unique_ptr<std::string> ednssubnetStr{nullptr};
 505   std::vector<pdns_ednsoption_t> ednsOptionsVect;
 506   std::vector<pdns_proxyprotocol_value_t> proxyProtocolValuesVect;
 507
 508   const DNSName& qname;
 509   const ComboAddress& local;
 510   const ComboAddress& remote;
 511   const Netmask& ednssubnet;
 512   std::unordered_set<std::string>& policyTags;
 513   std::vector<DNSRecord>& records;
 514   const EDNSOptionViewMap& ednsOptions;
 515   const std::vector<ProxyProtocolValue>& proxyProtocolValues;
 516   std::string& requestorId;
 517   std::string& deviceId;
 518   std::string& deviceName;
 519   boost::optional<int>& rcode;
 520   uint32_t& ttlCap;
 521   bool& variable;
 522   bool& logQuery;
 523   bool& logResponse;
 524   bool& followCNAMERecords;
 525
 526   unsigned int tag{0};
 527   uint16_t qtype;
 528   bool tcp;
 529 };
 530
 531 unsigned int RecursorLua4::gettag_ffi(const ComboAddress& remote, const Netmask& ednssubnet, const ComboAddress& local, const DNSName& qname, uint16_t qtype, std::unordered_set<std::string>* policyTags, std::vector<DNSRecord>& records, LuaContext::LuaObject& data, const EDNSOptionViewMap& ednsOptions, bool tcp, const std::vector<ProxyProtocolValue>& proxyProtocolValues, std::string& requestorId, std::string& deviceId, std::string& deviceName, boost::optional<int>& rcode, uint32_t& ttlCap, bool& variable, bool& logQuery, bool& logResponse, bool& followCNAMERecords) const
 532 {
 533   if (d_gettag_ffi) {
 534     pdns_ffi_param_t param(qname, qtype, local, remote, ednssubnet, *policyTags, records, ednsOptions, proxyProtocolValues, requestorId, deviceId, deviceName, rcode, ttlCap, variable, tcp, logQuery, logResponse, followCNAMERecords);
 535
 536     auto ret = d_gettag_ffi(&param);
 537     if (ret) {
 538       data = *ret;
 539     }
 540
 541     return param.tag;
 542   }
 543   return 0;
 544 }
 545
 546 bool RecursorLua4::genhook(const luacall_t& func, DNSQuestion& dq, int& ret) const
 547 {
 548   if(!func)
 549     return false;
 550
 551   if (dq.currentRecords) {
 552     dq.records = *dq.currentRecords;
 553   } else {
 554     dq.records.clear();
 555   }
 556
 557   dq.followupFunction.clear();
 558   dq.followupPrefix.clear();
 559   dq.followupName.clear();
 560   dq.udpQuery.clear();
 561   dq.udpAnswer.clear();
 562   dq.udpCallback.clear();
 563
 564   dq.rcode = ret;
 565   bool handled=func(&dq);
 566
 567   if(handled) {
 568 loop:;
 569     ret=dq.rcode;
 570
 571     if(!dq.followupFunction.empty()) {
 572       if(dq.followupFunction=="followCNAMERecords") {
 573         ret = followCNAMERecords(dq.records, QType(dq.qtype));
 574       }
 575       else if(dq.followupFunction=="getFakeAAAARecords") {
 576         ret=getFakeAAAARecords(dq.followupName, ComboAddress(dq.followupPrefix), dq.records);
 577       }
 578       else if(dq.followupFunction=="getFakePTRRecords") {
 579         ret=getFakePTRRecords(dq.followupName, dq.records);
 580       }
 581       else if(dq.followupFunction=="udpQueryResponse") {
 582         dq.udpAnswer = GenUDPQueryResponse(dq.udpQueryDest, dq.udpQuery);
 583         auto cbFunc = d_lw->readVariable<boost::optional<luacall_t>>(dq.udpCallback).get_value_or(0);
 584         if(!cbFunc) {
 585           g_log<<Logger::Error<<"Attempted callback for Lua UDP Query/Response which could not be found"<<endl;
 586           return false;
 587         }
 588         bool result=cbFunc(&dq);
 589         if(!result) {
 590           return false;
 591         }
 592         goto loop;
 593       }
 594     }
 595     if (dq.currentRecords) {
 596       *dq.currentRecords = dq.records;
 597     }
 598   }
 599
 600   // see if they added followup work for us too
 601   return handled;
 602 }
 603
 604 RecursorLua4::~RecursorLua4(){}
 605
 606 const char* pdns_ffi_param_get_qname(pdns_ffi_param_t* ref)
 607 {
 608   if (!ref->qnameStr) {
 609     ref->qnameStr = std::unique_ptr<std::string>(new std::string(ref->qname.toStringNoDot()));
 610   }
 611
 612   return ref->qnameStr->c_str();
 613 }
 614
 615 void pdns_ffi_param_get_qname_raw(pdns_ffi_param_t* ref, const char** qname, size_t* qnameSize)
 616 {
 617   const auto& storage = ref->qname.getStorage();
 618   *qname = storage.data();
 619   *qnameSize = storage.size();
 620 }
 621
 622 uint16_t pdns_ffi_param_get_qtype(const pdns_ffi_param_t* ref)
 623 {
 624   return ref->qtype;
 625 }
 626
 627 const char* pdns_ffi_param_get_remote(pdns_ffi_param_t* ref)
 628 {
 629   if (!ref->remoteStr) {
 630     ref->remoteStr = std::unique_ptr<std::string>(new std::string(ref->remote.toString()));
 631   }
 632
 633   return ref->remoteStr->c_str();
 634 }
 635
 636 static void pdns_ffi_comboaddress_to_raw(const ComboAddress& ca, const void** addr, size_t* addrSize)
 637 {
 638   if (ca.isIPv4()) {
 639     *addr = &ca.sin4.sin_addr.s_addr;
 640     *addrSize = sizeof(ca.sin4.sin_addr.s_addr);
 641   }
 642   else {
 643     *addr = &ca.sin6.sin6_addr.s6_addr;
 644     *addrSize = sizeof(ca.sin6.sin6_addr.s6_addr);
 645   }
 646 }
 647
 648 void pdns_ffi_param_get_remote_raw(pdns_ffi_param_t* ref, const void** addr, size_t* addrSize)
 649 {
 650   pdns_ffi_comboaddress_to_raw(ref->remote, addr, addrSize);
 651 }
 652
 653 uint16_t pdns_ffi_param_get_remote_port(const pdns_ffi_param_t* ref)
 654 {
 655   return ref->remote.getPort();
 656 }
 657
 658 const char* pdns_ffi_param_get_local(pdns_ffi_param_t* ref)
 659 {
 660   if (!ref->localStr) {
 661     ref->localStr = std::unique_ptr<std::string>(new std::string(ref->local.toString()));
 662   }
 663
 664   return ref->localStr->c_str();
 665 }
 666
 667 void pdns_ffi_param_get_local_raw(pdns_ffi_param_t* ref, const void** addr, size_t* addrSize)
 668 {
 669   pdns_ffi_comboaddress_to_raw(ref->local, addr, addrSize);
 670 }
 671
 672 uint16_t pdns_ffi_param_get_local_port(const pdns_ffi_param_t* ref)
 673 {
 674   return ref->local.getPort();
 675 }
 676
 677 const char* pdns_ffi_param_get_edns_cs(pdns_ffi_param_t* ref)
 678 {
 679   if (ref->ednssubnet.empty()) {
 680     return nullptr;
 681   }
 682
 683   if (!ref->ednssubnetStr) {
 684     ref->ednssubnetStr = std::unique_ptr<std::string>(new std::string(ref->ednssubnet.toStringNoMask()));
 685   }
 686
 687   return ref->ednssubnetStr->c_str();
 688 }
 689
 690 void pdns_ffi_param_get_edns_cs_raw(pdns_ffi_param_t* ref, const void** net, size_t* netSize)
 691 {
 692   if (ref->ednssubnet.empty()) {
 693     *net = nullptr;
 694     *netSize = 0;
 695     return;
 696   }
 697
 698   pdns_ffi_comboaddress_to_raw(ref->ednssubnet.getNetwork(), net, netSize);
 699 }
 700
 701 uint8_t pdns_ffi_param_get_edns_cs_source_mask(const pdns_ffi_param_t* ref)
 702 {
 703   return ref->ednssubnet.getBits();
 704 }
 705
 706 static void fill_edns_option(const EDNSOptionViewValue& value, pdns_ednsoption_t& option)
 707 {
 708   option.len = value.size;
 709   option.data = nullptr;
 710
 711   if (value.size > 0) {
 712     option.data = value.content;
 713   }
 714 }
 715
 716 size_t pdns_ffi_param_get_edns_options(pdns_ffi_param_t* ref, const pdns_ednsoption_t** out)
 717 {
 718   if (ref->ednsOptions.empty()) {
 719     return 0;
 720   }
 721
 722   size_t totalCount = 0;
 723   for (const auto& option : ref->ednsOptions) {
 724     totalCount += option.second.values.size();
 725   }
 726
 727   ref->ednsOptionsVect.resize(totalCount);
 728
 729   size_t pos = 0;
 730   for (const auto& option : ref->ednsOptions) {
 731     for (const auto& entry : option.second.values) {
 732       fill_edns_option(entry, ref->ednsOptionsVect.at(pos));
 733       ref->ednsOptionsVect.at(pos).optionCode = option.first;
 734       pos++;
 735     }
 736   }
 737
 738   *out = ref->ednsOptionsVect.data();
 739
 740   return totalCount;
 741 }
 742
 743 size_t pdns_ffi_param_get_edns_options_by_code(pdns_ffi_param_t* ref, uint16_t optionCode, const pdns_ednsoption_t** out)
 744 {
 745   const auto& it = ref->ednsOptions.find(optionCode);
 746   if (it == ref->ednsOptions.cend() || it->second.values.empty()) {
 747     return 0;
 748   }
 749
 750   ref->ednsOptionsVect.resize(it->second.values.size());
 751
 752   size_t pos = 0;
 753   for (const auto& entry : it->second.values) {
 754     fill_edns_option(entry, ref->ednsOptionsVect.at(pos));
 755     ref->ednsOptionsVect.at(pos).optionCode = optionCode;
 756     pos++;
 757   }
 758
 759   *out = ref->ednsOptionsVect.data();
 760
 761   return pos;
 762 }
 763
 764 size_t pdns_ffi_param_get_proxy_protocol_values(pdns_ffi_param_t* ref, const pdns_proxyprotocol_value_t** out)
 765 {
 766   if (ref->proxyProtocolValues.empty()) {
 767     return 0;
 768   }
 769
 770   ref->proxyProtocolValuesVect.resize(ref->proxyProtocolValues.size());
 771
 772   size_t pos = 0;
 773   for (const auto& value : ref->proxyProtocolValues) {
 774     auto& dest = ref->proxyProtocolValuesVect.at(pos);
 775     dest.type = value.type;
 776     dest.len = value.content.size();
 777     if (dest.len > 0) {
 778       dest.data = value.content.data();
 779     }
 780     pos++;
 781   }
 782
 783   *out = ref->proxyProtocolValuesVect.data();
 784
 785   return ref->proxyProtocolValuesVect.size();
 786 }
 787
 788 void pdns_ffi_param_set_tag(pdns_ffi_param_t* ref, unsigned int tag)
 789 {
 790   ref->tag = tag;
 791 }
 792
 793 void pdns_ffi_param_add_policytag(pdns_ffi_param_t *ref, const char* name)
 794 {
 795   ref->policyTags.insert(std::string(name));
 796 }
 797
 798 void pdns_ffi_param_set_requestorid(pdns_ffi_param_t* ref, const char* name)
 799 {
 800   ref->requestorId = std::string(name);
 801 }
 802
 803 void pdns_ffi_param_set_devicename(pdns_ffi_param_t* ref, const char* name)
 804 {
 805   ref->deviceName = std::string(name);
 806 }
 807
 808 void pdns_ffi_param_set_deviceid(pdns_ffi_param_t* ref, size_t len, const void* name)
 809 {
 810   ref->deviceId = std::string(reinterpret_cast<const char*>(name), len);
 811 }
 812
 813 void pdns_ffi_param_set_variable(pdns_ffi_param_t* ref, bool variable)
 814 {
 815   ref->variable = variable;
 816 }
 817
 818 void pdns_ffi_param_set_ttl_cap(pdns_ffi_param_t* ref, uint32_t ttl)
 819 {
 820   ref->ttlCap = ttl;
 821 }
 822
 823 void pdns_ffi_param_set_log_query(pdns_ffi_param_t* ref, bool logQuery)
 824 {
 825   ref->logQuery = logQuery;
 826 }
 827
 828 void pdns_ffi_param_set_log_response(pdns_ffi_param_t* ref, bool logResponse)
 829 {
 830   ref->logResponse = logResponse;
 831 }
 832
 833 void pdns_ffi_param_set_rcode(pdns_ffi_param_t* ref, int rcode)
 834 {
 835   ref->rcode = rcode;
 836 }
 837
 838 void pdns_ffi_param_set_follow_cname_records(pdns_ffi_param_t* ref, bool follow)
 839 {
 840   ref->followCNAMERecords = follow;
 841 }
 842
 843 bool pdns_ffi_param_add_record(pdns_ffi_param_t *ref, const char* name, uint16_t type, uint32_t ttl, const char* content, size_t contentSize, pdns_record_place_t place)
 844 {
 845   try {
 846     DNSRecord dr;
 847     dr.d_name = name != nullptr ? DNSName(name) : ref->qname;
 848     dr.d_ttl = ttl;
 849     dr.d_type = type;
 850     dr.d_class = QClass::IN;
 851     dr.d_place = DNSResourceRecord::Place(place);
 852     dr.d_content = DNSRecordContent::mastermake(type, QClass::IN, std::string(content, contentSize));
 853     ref->records.push_back(std::move(dr));
 854
 855     return true;
 856   }
 857   catch (const std::exception& e) {
 858     g_log<<Logger::Error<<"Error attempting to add a record from Lua via pdns_ffi_param_add_record(): "<<e.what()<<endl;
 859     return false;
 860   }
 861 }