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 static int followCNAMERecords(vector<DNSRecord>& ret, const QType& qtype)
  38 {
  39   vector<DNSRecord> resolved;
  40   DNSName target;
  41   for(const DNSRecord& rr :  ret) {
  42     if(rr.d_type == QType::CNAME) {
  43       auto rec = getRR<CNAMERecordContent>(rr);
  44       if(rec) {
  45         target=rec->getTarget();
  46         break;
  47       }
  48     }
  49   }
  50   if(target.empty())
  51     return 0;
  52
  53   int rcode=directResolve(target, qtype, 1, resolved); // 1 == class
  54
  55   for(const DNSRecord& rr :  resolved) {
  56     ret.push_back(rr);
  57   }
  58   return rcode;
  59
  60 }
  61
  62 static int getFakeAAAARecords(const DNSName& qname, const std::string& prefix, vector<DNSRecord>& ret)
  63 {
  64   int rcode=directResolve(qname, QType(QType::A), 1, ret);
  65
  66   ComboAddress prefixAddress(prefix);
  67
  68   for(DNSRecord& rr :  ret)
  69   {
  70     if(rr.d_type == QType::A && rr.d_place==DNSResourceRecord::ANSWER) {
  71       if(auto rec = getRR<ARecordContent>(rr)) {
  72         ComboAddress ipv4(rec->getCA());
  73         uint32_t tmp;
  74         memcpy((void*)&tmp, &ipv4.sin4.sin_addr.s_addr, 4);
  75         // tmp=htonl(tmp);
  76         memcpy(((char*)&prefixAddress.sin6.sin6_addr.s6_addr)+12, &tmp, 4);
  77         rr.d_content = std::make_shared<AAAARecordContent>(prefixAddress);
  78         rr.d_type = QType::AAAA;
  79       }
  80     }
  81   }
  82   return rcode;
  83 }
  84
  85 static int getFakePTRRecords(const DNSName& qname, const std::string& prefix, vector<DNSRecord>& ret)
  86 {
  87   /* qname has a reverse ordered IPv6 address, need to extract the underlying IPv4 address from it
  88      and turn it into an IPv4 in-addr.arpa query */
  89   ret.clear();
  90   vector<string> parts = qname.getRawLabels();
  91
  92   if(parts.size() < 8)
  93     return -1;
  94
  95   string newquery;
  96   for(int n = 0; n < 4; ++n) {
  97     newquery +=
  98       std::to_string(stoll(parts[n*2], 0, 16) + 16*stoll(parts[n*2+1], 0, 16));
  99     newquery.append(1,'.');
 100   }
 101   newquery += "in-addr.arpa.";
 102
 103
 104   int rcode = directResolve(DNSName(newquery), QType(QType::PTR), 1, ret);
 105   for(DNSRecord& rr :  ret)
 106   {
 107     if(rr.d_type == QType::PTR && rr.d_place==DNSResourceRecord::ANSWER) {
 108       rr.d_name = qname;
 109     }
 110   }
 111   return rcode;
 112
 113 }
 114
 115 boost::optional<dnsheader> RecursorLua4::DNSQuestion::getDH() const
 116 {
 117   if (dh)
 118     return *dh;
 119   return boost::optional<dnsheader>();
 120 }
 121
 122 vector<string> RecursorLua4::DNSQuestion::getEDNSFlags() const
 123 {
 124   vector<string> ret;
 125   if (ednsFlags) {
 126     if (*ednsFlags & EDNSOpts::DNSSECOK)
 127       ret.push_back("DO");
 128   }
 129   return ret;
 130 }
 131
 132 bool RecursorLua4::DNSQuestion::getEDNSFlag(string flag) const
 133 {
 134   if (ednsFlags) {
 135     if (flag == "DO" && (*ednsFlags & EDNSOpts::DNSSECOK))
 136       return true;
 137   }
 138   return false;
 139 }
 140
 141 vector<pair<uint16_t, string> > RecursorLua4::DNSQuestion::getEDNSOptions() const
 142 {
 143   if(ednsOptions)
 144     return *ednsOptions;
 145   else
 146     return vector<pair<uint16_t,string>>();
 147 }
 148
 149 boost::optional<string>  RecursorLua4::DNSQuestion::getEDNSOption(uint16_t code) const
 150 {
 151   if(ednsOptions)
 152     for(const auto& o : *ednsOptions)
 153       if(o.first==code)
 154         return o.second;
 155
 156   return boost::optional<string>();
 157 }
 158
 159 boost::optional<Netmask>  RecursorLua4::DNSQuestion::getEDNSSubnet() const
 160 {
 161
 162   if(ednsOptions) {
 163     for(const auto& o : *ednsOptions) {
 164       if(o.first==EDNSOptionCode::ECS) {
 165         EDNSSubnetOpts eso;
 166         if(getEDNSSubnetOptsFromString(o.second, &eso))
 167           return eso.source;
 168         else
 169           break;
 170       }
 171     }
 172   }
 173   return boost::optional<Netmask>();
 174 }
 175
 176
 177 vector<pair<int, DNSRecord> > RecursorLua4::DNSQuestion::getRecords() const
 178 {
 179   vector<pair<int, DNSRecord> > ret;
 180   int num=1;
 181   for(const auto& r : records) {
 182     ret.push_back({num++, r});
 183   }
 184   return ret;
 185 }
 186 void RecursorLua4::DNSQuestion::setRecords(const vector<pair<int, DNSRecord> >& recs)
 187 {
 188   records.clear();
 189   for(const auto& p : recs) {
 190     records.push_back(p.second);
 191   }
 192 }
 193
 194 void RecursorLua4::DNSQuestion::addRecord(uint16_t type, const std::string& content, DNSResourceRecord::Place place, boost::optional<int> ttl, boost::optional<string> name)
 195 {
 196   DNSRecord dr;
 197   dr.d_name=name ? DNSName(*name) : qname;
 198   dr.d_ttl=ttl.get_value_or(3600);
 199   dr.d_type = type;
 200   dr.d_place = place;
 201   dr.d_content = DNSRecordContent::mastermake(type, 1, content);
 202   records.push_back(dr);
 203 }
 204
 205 void RecursorLua4::DNSQuestion::addAnswer(uint16_t type, const std::string& content, boost::optional<int> ttl, boost::optional<string> name)
 206 {
 207   addRecord(type, content, DNSResourceRecord::ANSWER, ttl, name);
 208 }
 209
 210 struct DynMetric
 211 {
 212   std::atomic<unsigned long>* ptr;
 213   void inc() { (*ptr)++; }
 214   void incBy(unsigned int by) { (*ptr)+= by; }
 215   unsigned long get() { return *ptr; }
 216   void set(unsigned long val) { *ptr =val; }
 217 };
 218
 219 void RecursorLua4::postPrepareContext()
 220 {
 221   d_lw->registerMember<const DNSName (DNSQuestion::*)>("qname", [](const DNSQuestion& dq) -> const DNSName& { return dq.qname; }, [](DNSQuestion& dq, const DNSName& newName) { (void) newName; });
 222   d_lw->registerMember<uint16_t (DNSQuestion::*)>("qtype", [](const DNSQuestion& dq) -> uint16_t { return dq.qtype; }, [](DNSQuestion& dq, uint16_t newType) { (void) newType; });
 223   d_lw->registerMember<bool (DNSQuestion::*)>("isTcp", [](const DNSQuestion& dq) -> bool { return dq.isTcp; }, [](DNSQuestion& dq, bool newTcp) { (void) newTcp; });
 224   d_lw->registerMember<const ComboAddress (DNSQuestion::*)>("localaddr", [](const DNSQuestion& dq) -> const ComboAddress& { return dq.local; }, [](DNSQuestion& dq, const ComboAddress& newLocal) { (void) newLocal; });
 225   d_lw->registerMember<const ComboAddress (DNSQuestion::*)>("remoteaddr", [](const DNSQuestion& dq) -> const ComboAddress& { return dq.remote; }, [](DNSQuestion& dq, const ComboAddress& newRemote) { (void) newRemote; });
 226   d_lw->registerMember<vState (DNSQuestion::*)>("validationState", [](const DNSQuestion& dq) -> vState { return dq.validationState; }, [](DNSQuestion& dq, vState newState) { (void) newState; });
 227
 228   d_lw->registerMember<bool (DNSQuestion::*)>("variable", [](const DNSQuestion& dq) -> bool { return dq.variable; }, [](DNSQuestion& dq, bool newVariable) { dq.variable = newVariable; });
 229   d_lw->registerMember<bool (DNSQuestion::*)>("wantsRPZ", [](const DNSQuestion& dq) -> bool { return dq.wantsRPZ; }, [](DNSQuestion& dq, bool newWantsRPZ) { dq.wantsRPZ = newWantsRPZ; });
 230
 231   d_lw->registerMember("rcode", &DNSQuestion::rcode);
 232   d_lw->registerMember("tag", &DNSQuestion::tag);
 233   d_lw->registerMember("requestorId", &DNSQuestion::requestorId);
 234   d_lw->registerMember("followupFunction", &DNSQuestion::followupFunction);
 235   d_lw->registerMember("followupPrefix", &DNSQuestion::followupPrefix);
 236   d_lw->registerMember("followupName", &DNSQuestion::followupName);
 237   d_lw->registerMember("data", &DNSQuestion::data);
 238   d_lw->registerMember("udpQuery", &DNSQuestion::udpQuery);
 239   d_lw->registerMember("udpAnswer", &DNSQuestion::udpAnswer);
 240   d_lw->registerMember("udpQueryDest", &DNSQuestion::udpQueryDest);
 241   d_lw->registerMember("udpCallback", &DNSQuestion::udpCallback);
 242   d_lw->registerMember("appliedPolicy", &DNSQuestion::appliedPolicy);
 243   d_lw->registerMember<DNSFilterEngine::Policy, std::string>("policyName",
 244     [](const DNSFilterEngine::Policy& pol) -> std::string {
 245       if(pol.d_name)
 246         return *pol.d_name;
 247       return std::string();
 248     },
 249     [](DNSFilterEngine::Policy& pol, const std::string& name) {
 250       pol.d_name = std::make_shared<std::string>(name);
 251     });
 252   d_lw->registerMember("policyKind", &DNSFilterEngine::Policy::d_kind);
 253   d_lw->registerMember("policyTTL", &DNSFilterEngine::Policy::d_ttl);
 254   d_lw->registerMember<DNSFilterEngine::Policy, std::string>("policyCustom",
 255     [](const DNSFilterEngine::Policy& pol) -> std::string {
 256       if(pol.d_custom)
 257         return pol.d_custom->getZoneRepresentation();
 258       return std::string();
 259     },
 260     [](DNSFilterEngine::Policy& pol, const std::string& content) {
 261       // Only CNAMES for now, when we ever add a d_custom_type, there will be pain
 262       pol.d_custom = DNSRecordContent::mastermake(QType::CNAME, 1, content);
 263     }
 264   );
 265   d_lw->registerFunction("getDH", &DNSQuestion::getDH);
 266   d_lw->registerFunction("getEDNSOptions", &DNSQuestion::getEDNSOptions);
 267   d_lw->registerFunction("getEDNSOption", &DNSQuestion::getEDNSOption);
 268   d_lw->registerFunction("getEDNSSubnet", &DNSQuestion::getEDNSSubnet);
 269   d_lw->registerFunction("getEDNSFlags", &DNSQuestion::getEDNSFlags);
 270   d_lw->registerFunction("getEDNSFlag", &DNSQuestion::getEDNSFlag);
 271   d_lw->registerMember("name", &DNSRecord::d_name);
 272   d_lw->registerMember("type", &DNSRecord::d_type);
 273   d_lw->registerMember("ttl", &DNSRecord::d_ttl);
 274   d_lw->registerMember("place", &DNSRecord::d_place);
 275
 276   d_lw->registerMember("size", &EDNSOptionView::size);
 277   d_lw->registerFunction<std::string(EDNSOptionView::*)()>("getContent", [](const EDNSOptionView& option) { return std::string(option.content, option.size); });
 278
 279   d_lw->registerFunction<string(DNSRecord::*)()>("getContent", [](const DNSRecord& dr) { return dr.d_content->getZoneRepresentation(); });
 280   d_lw->registerFunction<boost::optional<ComboAddress>(DNSRecord::*)()>("getCA", [](const DNSRecord& dr) {
 281       boost::optional<ComboAddress> ret;
 282
 283       if(auto rec = std::dynamic_pointer_cast<ARecordContent>(dr.d_content))
 284         ret=rec->getCA(53);
 285       else if(auto aaaarec = std::dynamic_pointer_cast<AAAARecordContent>(dr.d_content))
 286         ret=aaaarec->getCA(53);
 287       return ret;
 288     });
 289
 290
 291   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); });
 292   d_lw->registerFunction("addAnswer", &DNSQuestion::addAnswer);
 293   d_lw->registerFunction("addRecord", &DNSQuestion::addRecord);
 294   d_lw->registerFunction("getRecords", &DNSQuestion::getRecords);
 295   d_lw->registerFunction("setRecords", &DNSQuestion::setRecords);
 296
 297   d_lw->registerFunction<void(DNSQuestion::*)(const std::string&)>("addPolicyTag", [](DNSQuestion& dq, const std::string& tag) { if (dq.policyTags) { dq.policyTags->push_back(tag); } });
 298   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) {
 299       if (dq.policyTags) {
 300         dq.policyTags->clear();
 301         for (const auto& tag : tags) {
 302           dq.policyTags->push_back(tag.second);
 303         }
 304       }
 305     });
 306   d_lw->registerFunction<std::vector<std::pair<int, std::string> >(DNSQuestion::*)()>("getPolicyTags", [](const DNSQuestion& dq) {
 307       std::vector<std::pair<int, std::string> > ret;
 308       if (dq.policyTags) {
 309         int count = 1;
 310         for (const auto& tag : *dq.policyTags) {
 311           ret.push_back({count++, tag});
 312         }
 313       }
 314       return ret;
 315     });
 316
 317   d_lw->registerFunction<void(DNSQuestion::*)(const std::string&)>("discardPolicy", [](DNSQuestion& dq, const std::string& policy) {
 318       if (dq.discardedPolicies) {
 319         (*dq.discardedPolicies)[policy] = true;
 320       }
 321     });
 322
 323   d_lw->writeFunction("newDS", []() { return SuffixMatchNode(); });
 324   d_lw->registerFunction<void(SuffixMatchNode::*)(boost::variant<string,DNSName, vector<pair<unsigned int,string> > >)>(
 325     "add",
 326     [](SuffixMatchNode&smn, const boost::variant<string,DNSName,vector<pair<unsigned int,string> > >& in){
 327       try {
 328         if(auto s = boost::get<string>(&in)) {
 329           smn.add(DNSName(*s));
 330         }
 331         else if(auto v = boost::get<vector<pair<unsigned int, string> > >(&in)) {
 332           for(const auto& entry : *v)
 333             smn.add(DNSName(entry.second));
 334         }
 335         else {
 336           smn.add(boost::get<DNSName>(in));
 337         }
 338       }
 339       catch(std::exception& e) {
 340         g_log <<Logger::Error<<e.what()<<endl;
 341       }
 342     }
 343   );
 344
 345   d_lw->registerFunction("check",(bool (SuffixMatchNode::*)(const DNSName&) const) &SuffixMatchNode::check);
 346   d_lw->registerFunction("toString",(string (SuffixMatchNode::*)() const) &SuffixMatchNode::toString);
 347
 348   d_pd.push_back({"policykinds", in_t {
 349     {"NoAction", (int)DNSFilterEngine::PolicyKind::NoAction},
 350     {"Drop",     (int)DNSFilterEngine::PolicyKind::Drop    },
 351     {"NXDOMAIN", (int)DNSFilterEngine::PolicyKind::NXDOMAIN},
 352     {"NODATA",   (int)DNSFilterEngine::PolicyKind::NODATA  },
 353     {"Truncate", (int)DNSFilterEngine::PolicyKind::Truncate},
 354     {"Custom",   (int)DNSFilterEngine::PolicyKind::Custom  }
 355     }});
 356
 357   for(const auto& n : QType::names)
 358     d_pd.push_back({n.first, n.second});
 359
 360   d_pd.push_back({"validationstates", in_t{
 361         {"Indeterminate", Indeterminate },
 362         {"Bogus", Bogus },
 363         {"Insecure", Insecure },
 364         {"Secure", Secure },
 365   }});
 366
 367   d_pd.push_back({"now", &g_now});
 368
 369   d_lw->writeFunction("getMetric", [](const std::string& str) {
 370       return DynMetric{getDynMetric(str)};
 371     });
 372
 373   d_lw->registerFunction("inc", &DynMetric::inc);
 374   d_lw->registerFunction("incBy", &DynMetric::incBy);
 375   d_lw->registerFunction("set", &DynMetric::set);
 376   d_lw->registerFunction("get", &DynMetric::get);
 377
 378   d_lw->writeFunction("getStat", [](const std::string& str) {
 379       uint64_t result = 0;
 380       optional<uint64_t> value = getStatByName(str);
 381       if (value) {
 382         result = *value;
 383       }
 384       return result;
 385     });
 386
 387   d_lw->writeFunction("getRecursorThreadId", []() {
 388       return getRecursorThreadId();
 389     });
 390
 391   d_lw->writeFunction("sendCustomSNMPTrap", [](const std::string& str) {
 392       if (g_snmpAgent) {
 393         g_snmpAgent->sendCustomTrap(str);
 394       }
 395     });
 396 }
 397
 398 void RecursorLua4::postLoad() {
 399   d_prerpz = d_lw->readVariable<boost::optional<luacall_t>>("prerpz").get_value_or(0);
 400   d_preresolve = d_lw->readVariable<boost::optional<luacall_t>>("preresolve").get_value_or(0);
 401   d_nodata = d_lw->readVariable<boost::optional<luacall_t>>("nodata").get_value_or(0);
 402   d_nxdomain = d_lw->readVariable<boost::optional<luacall_t>>("nxdomain").get_value_or(0);
 403   d_postresolve = d_lw->readVariable<boost::optional<luacall_t>>("postresolve").get_value_or(0);
 404   d_preoutquery = d_lw->readVariable<boost::optional<luacall_t>>("preoutquery").get_value_or(0);
 405
 406   d_ipfilter = d_lw->readVariable<boost::optional<ipfilter_t>>("ipfilter").get_value_or(0);
 407   d_gettag = d_lw->readVariable<boost::optional<gettag_t>>("gettag").get_value_or(0);
 408   d_gettag_ffi = d_lw->readVariable<boost::optional<gettag_ffi_t>>("gettag_ffi").get_value_or(0);
 409 }
 410
 411 bool RecursorLua4::prerpz(DNSQuestion& dq, int& ret) const
 412 {
 413   return genhook(d_prerpz, dq, ret);
 414 }
 415
 416 bool RecursorLua4::preresolve(DNSQuestion& dq, int& ret) const
 417 {
 418   return genhook(d_preresolve, dq, ret);
 419 }
 420
 421 bool RecursorLua4::nxdomain(DNSQuestion& dq, int& ret) const
 422 {
 423   return genhook(d_nxdomain, dq, ret);
 424 }
 425
 426 bool RecursorLua4::nodata(DNSQuestion& dq, int& ret) const
 427 {
 428   return genhook(d_nodata, dq, ret);
 429 }
 430
 431 bool RecursorLua4::postresolve(DNSQuestion& dq, int& ret) const
 432 {
 433   return genhook(d_postresolve, dq, ret);
 434 }
 435
 436 bool RecursorLua4::preoutquery(const ComboAddress& ns, const ComboAddress& requestor, const DNSName& query, const QType& qtype, bool isTcp, vector<DNSRecord>& res, int& ret) const
 437 {
 438   bool variableAnswer = false;
 439   bool wantsRPZ = false;
 440   RecursorLua4::DNSQuestion dq(ns, requestor, query, qtype.getCode(), isTcp, variableAnswer, wantsRPZ);
 441   dq.currentRecords = &res;
 442
 443   return genhook(d_preoutquery, dq, ret);
 444 }
 445
 446 bool RecursorLua4::ipfilter(const ComboAddress& remote, const ComboAddress& local, const struct dnsheader& dh) const
 447 {
 448   if(d_ipfilter)
 449     return d_ipfilter(remote, local, dh);
 450   return false; // don't block
 451 }
 452
 453 unsigned int RecursorLua4::gettag(const ComboAddress& remote, const Netmask& ednssubnet, const ComboAddress& local, const DNSName& qname, uint16_t qtype, std::vector<std::string>* policyTags, LuaContext::LuaObject& data, const std::map<uint16_t, EDNSOptionView>& ednsOptions, bool tcp, std::string& requestorId, std::string& deviceId) const
 454 {
 455   if(d_gettag) {
 456     auto ret = d_gettag(remote, ednssubnet, local, qname, qtype, ednsOptions, tcp);
 457
 458     if (policyTags) {
 459       const auto& tags = std::get<1>(ret);
 460       if (tags) {
 461         for (const auto& tag : *tags) {
 462           policyTags->push_back(tag.second);
 463         }
 464       }
 465     }
 466     const auto dataret = std::get<2>(ret);
 467     if (dataret) {
 468       data = *dataret;
 469     }
 470     const auto reqIdret = std::get<3>(ret);
 471     if (reqIdret) {
 472       requestorId = *reqIdret;
 473     }
 474     const auto deviceIdret = std::get<4>(ret);
 475     if (deviceIdret) {
 476       deviceId = *deviceIdret;
 477     }
 478     return std::get<0>(ret);
 479   }
 480   return 0;
 481 }
 482
 483 struct pdns_ffi_param
 484 {
 485 public:
 486   pdns_ffi_param(const DNSName& qname_, uint16_t qtype_, const ComboAddress& local_, const ComboAddress& remote_, const Netmask& ednssubnet_, std::vector<std::string>& policyTags_, const std::map<uint16_t, EDNSOptionView>& ednsOptions_, std::string& requestorId_, std::string& deviceId_, uint32_t& ttlCap_, bool& variable_, bool tcp_): qname(qname_), local(local_), remote(remote_), ednssubnet(ednssubnet_), policyTags(policyTags_), ednsOptions(ednsOptions_), requestorId(requestorId_), deviceId(deviceId_), ttlCap(ttlCap_), variable(variable_), qtype(qtype_), tcp(tcp_)
 487   {
 488   }
 489
 490   std::unique_ptr<std::string> qnameStr{nullptr};
 491   std::unique_ptr<std::string> localStr{nullptr};
 492   std::unique_ptr<std::string> remoteStr{nullptr};
 493   std::unique_ptr<std::string> ednssubnetStr{nullptr};
 494   std::vector<pdns_ednsoption_t> ednsOptionsVect;
 495
 496   const DNSName& qname;
 497   const ComboAddress& local;
 498   const ComboAddress& remote;
 499   const Netmask& ednssubnet;
 500   std::vector<std::string>& policyTags;
 501   const std::map<uint16_t, EDNSOptionView>& ednsOptions;
 502   std::string& requestorId;
 503   std::string& deviceId;
 504   uint32_t& ttlCap;
 505   bool& variable;
 506
 507   unsigned int tag{0};
 508   uint16_t qtype;
 509   bool tcp;
 510 };
 511
 512 unsigned int RecursorLua4::gettag_ffi(const ComboAddress& remote, const Netmask& ednssubnet, const ComboAddress& local, const DNSName& qname, uint16_t qtype, std::vector<std::string>* policyTags, LuaContext::LuaObject& data, const std::map<uint16_t, EDNSOptionView>& ednsOptions, bool tcp, std::string& requestorId, std::string& deviceId, uint32_t& ttlCap, bool& variable) const
 513 {
 514   if (d_gettag_ffi) {
 515     pdns_ffi_param_t param(qname, qtype, local, remote, ednssubnet, *policyTags, ednsOptions, requestorId, deviceId, ttlCap, variable, tcp);
 516
 517     auto ret = d_gettag_ffi(&param);
 518     if (ret) {
 519       data = *ret;
 520     }
 521
 522     return param.tag;
 523   }
 524   return 0;
 525 }
 526
 527 bool RecursorLua4::genhook(const luacall_t& func, DNSQuestion& dq, int& ret) const
 528 {
 529   if(!func)
 530     return false;
 531
 532   if (dq.currentRecords) {
 533     dq.records = *dq.currentRecords;
 534   } else {
 535     dq.records.clear();
 536   }
 537
 538   dq.followupFunction.clear();
 539   dq.followupPrefix.clear();
 540   dq.followupName.clear();
 541   dq.udpQuery.clear();
 542   dq.udpAnswer.clear();
 543   dq.udpCallback.clear();
 544
 545   dq.rcode = ret;
 546   bool handled=func(&dq);
 547
 548   if(handled) {
 549 loop:;
 550     ret=dq.rcode;
 551
 552     if(!dq.followupFunction.empty()) {
 553       if(dq.followupFunction=="followCNAMERecords") {
 554         ret = followCNAMERecords(dq.records, QType(dq.qtype));
 555       }
 556       else if(dq.followupFunction=="getFakeAAAARecords") {
 557         ret=getFakeAAAARecords(dq.followupName, dq.followupPrefix, dq.records);
 558       }
 559       else if(dq.followupFunction=="getFakePTRRecords") {
 560         ret=getFakePTRRecords(dq.followupName, dq.followupPrefix, dq.records);
 561       }
 562       else if(dq.followupFunction=="udpQueryResponse") {
 563         dq.udpAnswer = GenUDPQueryResponse(dq.udpQueryDest, dq.udpQuery);
 564         auto cbFunc = d_lw->readVariable<boost::optional<luacall_t>>(dq.udpCallback).get_value_or(0);
 565         if(!cbFunc) {
 566           g_log<<Logger::Error<<"Attempted callback for Lua UDP Query/Response which could not be found"<<endl;
 567           return false;
 568         }
 569         bool result=cbFunc(&dq);
 570         if(!result) {
 571           return false;
 572         }
 573         goto loop;
 574       }
 575     }
 576     if (dq.currentRecords) {
 577       *dq.currentRecords = dq.records;
 578     }
 579   }
 580
 581   // see if they added followup work for us too
 582   return handled;
 583 }
 584
 585 RecursorLua4::~RecursorLua4(){}
 586
 587 const char* pdns_ffi_param_get_qname(pdns_ffi_param_t* ref)
 588 {
 589   if (!ref->qnameStr) {
 590     ref->qnameStr = std::unique_ptr<std::string>(new std::string(ref->qname.toStringNoDot()));
 591   }
 592
 593   return ref->qnameStr->c_str();
 594 }
 595
 596 uint16_t pdns_ffi_param_get_qtype(const pdns_ffi_param_t* ref)
 597 {
 598   return ref->qtype;
 599 }
 600
 601 const char* pdns_ffi_param_get_remote(pdns_ffi_param_t* ref)
 602 {
 603   if (!ref->remoteStr) {
 604     ref->remoteStr = std::unique_ptr<std::string>(new std::string(ref->remote.toString()));
 605   }
 606
 607   return ref->remoteStr->c_str();
 608 }
 609
 610 uint16_t pdns_ffi_param_get_remote_port(const pdns_ffi_param_t* ref)
 611 {
 612   return ref->remote.getPort();
 613 }
 614
 615 const char* pdns_ffi_param_get_local(pdns_ffi_param_t* ref)
 616 {
 617   if (!ref->localStr) {
 618     ref->localStr = std::unique_ptr<std::string>(new std::string(ref->local.toString()));
 619   }
 620
 621   return ref->localStr->c_str();
 622 }
 623
 624 uint16_t pdns_ffi_param_get_local_port(const pdns_ffi_param_t* ref)
 625 {
 626   return ref->local.getPort();
 627 }
 628
 629 const char* pdns_ffi_param_get_edns_cs(pdns_ffi_param_t* ref)
 630 {
 631   if (ref->ednssubnet.empty()) {
 632     return nullptr;
 633   }
 634
 635   if (!ref->ednssubnetStr) {
 636     ref->ednssubnetStr = std::unique_ptr<std::string>(new std::string(ref->ednssubnet.toStringNoMask()));
 637   }
 638
 639   return ref->ednssubnetStr->c_str();
 640 }
 641
 642 uint8_t pdns_ffi_param_get_edns_cs_source_mask(const pdns_ffi_param_t* ref)
 643 {
 644   return ref->ednssubnet.getBits();
 645 }
 646
 647 static void fill_edns_option(const EDNSOptionView& view, pdns_ednsoption_t& option)
 648 {
 649   option.len = view.size;
 650   option.data = nullptr;
 651
 652   if (view.size > 0) {
 653     option.data = view.content;
 654   }
 655 }
 656
 657 size_t pdns_ffi_param_get_edns_options(pdns_ffi_param_t* ref, const pdns_ednsoption_t** out)
 658 {
 659   if (ref->ednsOptions.empty()) {
 660     return 0;
 661   }
 662
 663   size_t count = ref->ednsOptions.size();
 664   ref->ednsOptionsVect.resize(count);
 665
 666   size_t pos = 0;
 667   for (const auto& entry : ref->ednsOptions) {
 668     fill_edns_option(entry.second, ref->ednsOptionsVect.at(pos));
 669     ref->ednsOptionsVect.at(pos).optionCode = entry.first;
 670     pos++;
 671   }
 672
 673   *out = ref->ednsOptionsVect.data();
 674
 675   return count;
 676 }
 677
 678 size_t pdns_ffi_param_get_edns_options_by_code(pdns_ffi_param_t* ref, uint16_t optionCode, const pdns_ednsoption_t** out)
 679 {
 680   const auto& it = ref->ednsOptions.find(optionCode);
 681   if (it == ref->ednsOptions.cend()) {
 682     return 0;
 683   }
 684
 685   /* the current code deals with only one entry per code, but we will fix that */
 686   ref->ednsOptionsVect.resize(1);
 687   fill_edns_option(it->second, ref->ednsOptionsVect.at(0));
 688   ref->ednsOptionsVect.at(0).optionCode = it->first;
 689
 690   *out = ref->ednsOptionsVect.data();
 691
 692   return 1;
 693 }
 694
 695 void pdns_ffi_param_set_tag(pdns_ffi_param_t* ref, unsigned int tag)
 696 {
 697   ref->tag = tag;
 698 }
 699
 700 void pdns_ffi_param_add_policytag(pdns_ffi_param_t *ref, const char* name)
 701 {
 702   ref->policyTags.push_back(std::string(name));
 703 }
 704
 705 void pdns_ffi_param_set_requestorid(pdns_ffi_param_t* ref, const char* name)
 706 {
 707   ref->requestorId = std::string(name);
 708 }
 709
 710 void pdns_ffi_param_set_devicename(pdns_ffi_param_t* ref, const char* name)
 711 {
 712   ref->deviceId = std::string(name);
 713 }
 714
 715 void pdns_ffi_param_set_deviceid(pdns_ffi_param_t* ref, size_t len, const void* name)
 716 {
 717   ref->deviceId = std::string(reinterpret_cast<const char*>(name), len);
 718 }
 719
 720 void pdns_ffi_param_set_variable(pdns_ffi_param_t* ref, bool variable)
 721 {
 722   ref->variable = variable;
 723 }
 724
 725 void pdns_ffi_param_set_ttl_cap(pdns_ffi_param_t* ref, uint32_t ttl)
 726 {
 727   ref->ttlCap = ttl;
 728 }