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 getFakeAAAARecords(const DNSName& qname, const std::string& prefix, vector<DNSRecord>& ret)
  38 {
  39   int rcode=directResolve(qname, QType(QType::A), 1, ret);
  40
  41   ComboAddress prefixAddress(prefix);
  42
  43   // Remove double CNAME records
  44   std::set<DNSName> seenCNAMEs;
  45   ret.erase(std::remove_if(
  46         ret.begin(),
  47         ret.end(),
  48         [&seenCNAMEs](DNSRecord& rr) {
  49           if (rr.d_type == QType::CNAME) {
  50             auto target = getRR<CNAMERecordContent>(rr);
  51             if (target == nullptr) {
  52               return false;
  53             }
  54             if (seenCNAMEs.count(target->getTarget()) > 0) {
  55               // We've had this CNAME before, remove it
  56               return true;
  57             }
  58             seenCNAMEs.insert(target->getTarget());
  59           }
  60           return false;
  61         }),
  62       ret.end());
  63
  64   bool seenA = false;
  65   for(DNSRecord& rr :  ret)
  66   {
  67     if(rr.d_type == QType::A && rr.d_place==DNSResourceRecord::ANSWER) {
  68       if(auto rec = getRR<ARecordContent>(rr)) {
  69         ComboAddress ipv4(rec->getCA());
  70         uint32_t tmp;
  71         memcpy((void*)&tmp, &ipv4.sin4.sin_addr.s_addr, 4);
  72         // tmp=htonl(tmp);
  73         memcpy(((char*)&prefixAddress.sin6.sin6_addr.s6_addr)+12, &tmp, 4);
  74         rr.d_content = std::make_shared<AAAARecordContent>(prefixAddress);
  75         rr.d_type = QType::AAAA;
  76       }
  77       seenA = true;
  78     }
  79   }
  80
  81   if (seenA) {
  82     // We've seen an A in the ANSWER section, so there is no need to keep any
  83     // SOA in the AUTHORITY section as this is not a NODATA response.
  84     ret.erase(std::remove_if(
  85           ret.begin(),
  86           ret.end(),
  87           [](DNSRecord& rr) {
  88             return (rr.d_type == QType::SOA && rr.d_place==DNSResourceRecord::AUTHORITY);
  89           }),
  90         ret.end());
  91   }
  92   return rcode;
  93 }
  94
  95 static int getFakePTRRecords(const DNSName& qname, const std::string& prefix, vector<DNSRecord>& ret)
  96 {
  97   /* qname has a reverse ordered IPv6 address, need to extract the underlying IPv4 address from it
  98      and turn it into an IPv4 in-addr.arpa query */
  99   ret.clear();
 100   vector<string> parts = qname.getRawLabels();
 101
 102   if(parts.size() < 8)
 103     return -1;
 104
 105   string newquery;
 106   for(int n = 0; n < 4; ++n) {
 107     newquery +=
 108       std::to_string(stoll(parts[n*2], 0, 16) + 16*stoll(parts[n*2+1], 0, 16));
 109     newquery.append(1,'.');
 110   }
 111   newquery += "in-addr.arpa.";
 112
 113
 114   int rcode = directResolve(DNSName(newquery), QType(QType::PTR), 1, ret);
 115   for(DNSRecord& rr :  ret)
 116   {
 117     if(rr.d_type == QType::PTR && rr.d_place==DNSResourceRecord::ANSWER) {
 118       rr.d_name = qname;
 119     }
 120   }
 121   return rcode;
 122
 123 }
 124
 125 boost::optional<dnsheader> RecursorLua4::DNSQuestion::getDH() const
 126 {
 127   if (dh)
 128     return *dh;
 129   return boost::optional<dnsheader>();
 130 }
 131
 132 vector<string> RecursorLua4::DNSQuestion::getEDNSFlags() const
 133 {
 134   vector<string> ret;
 135   if (ednsFlags) {
 136     if (*ednsFlags & EDNSOpts::DNSSECOK)
 137       ret.push_back("DO");
 138   }
 139   return ret;
 140 }
 141
 142 bool RecursorLua4::DNSQuestion::getEDNSFlag(string flag) const
 143 {
 144   if (ednsFlags) {
 145     if (flag == "DO" && (*ednsFlags & EDNSOpts::DNSSECOK))
 146       return true;
 147   }
 148   return false;
 149 }
 150
 151 vector<pair<uint16_t, string> > RecursorLua4::DNSQuestion::getEDNSOptions() const
 152 {
 153   if(ednsOptions)
 154     return *ednsOptions;
 155   else
 156     return vector<pair<uint16_t,string>>();
 157 }
 158
 159 boost::optional<string>  RecursorLua4::DNSQuestion::getEDNSOption(uint16_t code) const
 160 {
 161   if(ednsOptions)
 162     for(const auto& o : *ednsOptions)
 163       if(o.first==code)
 164         return o.second;
 165
 166   return boost::optional<string>();
 167 }
 168
 169 boost::optional<Netmask>  RecursorLua4::DNSQuestion::getEDNSSubnet() const
 170 {
 171   if(ednsOptions) {
 172     for(const auto& o : *ednsOptions) {
 173       if(o.first==EDNSOptionCode::ECS) {
 174         EDNSSubnetOpts eso;
 175         if(getEDNSSubnetOptsFromString(o.second, &eso))
 176           return eso.source;
 177         else
 178           break;
 179       }
 180     }
 181   }
 182   return boost::optional<Netmask>();
 183 }
 184
 185
 186 vector<pair<int, DNSRecord> > RecursorLua4::DNSQuestion::getRecords() const
 187 {
 188   vector<pair<int, DNSRecord> > ret;
 189   int num=1;
 190   for(const auto& r : records) {
 191     ret.push_back({num++, r});
 192   }
 193   return ret;
 194 }
 195 void RecursorLua4::DNSQuestion::setRecords(const vector<pair<int, DNSRecord> >& recs)
 196 {
 197   records.clear();
 198   for(const auto& p : recs) {
 199     records.push_back(p.second);
 200   }
 201 }
 202
 203 void RecursorLua4::DNSQuestion::addRecord(uint16_t type, const std::string& content, DNSResourceRecord::Place place, boost::optional<int> ttl, boost::optional<string> name)
 204 {
 205   DNSRecord dr;
 206   dr.d_name=name ? DNSName(*name) : qname;
 207   dr.d_ttl=ttl.get_value_or(3600);
 208   dr.d_type = type;
 209   dr.d_place = place;
 210   dr.d_content = DNSRecordContent::mastermake(type, 1, content);
 211   records.push_back(dr);
 212 }
 213
 214 void RecursorLua4::DNSQuestion::addAnswer(uint16_t type, const std::string& content, boost::optional<int> ttl, boost::optional<string> name)
 215 {
 216   addRecord(type, content, DNSResourceRecord::ANSWER, ttl, name);
 217 }
 218
 219 struct DynMetric
 220 {
 221   std::atomic<unsigned long>* ptr;
 222   void inc() { (*ptr)++; }
 223   void incBy(unsigned int by) { (*ptr)+= by; }
 224   unsigned long get() { return *ptr; }
 225   void set(unsigned long val) { *ptr =val; }
 226 };
 227
 228 void RecursorLua4::postPrepareContext()
 229 {
 230   d_lw->registerMember<const DNSName (DNSQuestion::*)>("qname", [](const DNSQuestion& dq) -> const DNSName& { return dq.qname; }, [](DNSQuestion& dq, const DNSName& newName) { (void) newName; });
 231   d_lw->registerMember<uint16_t (DNSQuestion::*)>("qtype", [](const DNSQuestion& dq) -> uint16_t { return dq.qtype; }, [](DNSQuestion& dq, uint16_t newType) { (void) newType; });
 232   d_lw->registerMember<bool (DNSQuestion::*)>("isTcp", [](const DNSQuestion& dq) -> bool { return dq.isTcp; }, [](DNSQuestion& dq, bool newTcp) { (void) newTcp; });
 233   d_lw->registerMember<const ComboAddress (DNSQuestion::*)>("localaddr", [](const DNSQuestion& dq) -> const ComboAddress& { return dq.local; }, [](DNSQuestion& dq, const ComboAddress& newLocal) { (void) newLocal; });
 234   d_lw->registerMember<const ComboAddress (DNSQuestion::*)>("remoteaddr", [](const DNSQuestion& dq) -> const ComboAddress& { return dq.remote; }, [](DNSQuestion& dq, const ComboAddress& newRemote) { (void) newRemote; });
 235   d_lw->registerMember<vState (DNSQuestion::*)>("validationState", [](const DNSQuestion& dq) -> vState { return dq.validationState; }, [](DNSQuestion& dq, vState newState) { (void) newState; });
 236
 237   d_lw->registerMember<bool (DNSQuestion::*)>("variable", [](const DNSQuestion& dq) -> bool { return dq.variable; }, [](DNSQuestion& dq, bool newVariable) { dq.variable = newVariable; });
 238   d_lw->registerMember<bool (DNSQuestion::*)>("wantsRPZ", [](const DNSQuestion& dq) -> bool { return dq.wantsRPZ; }, [](DNSQuestion& dq, bool newWantsRPZ) { dq.wantsRPZ = newWantsRPZ; });
 239   d_lw->registerMember<bool (DNSQuestion::*)>("logResponse", [](const DNSQuestion& dq) -> bool { return dq.logResponse; }, [](DNSQuestion& dq, bool newLogResponse) { dq.logResponse = newLogResponse; });
 240
 241   d_lw->registerMember("rcode", &DNSQuestion::rcode);
 242   d_lw->registerMember("tag", &DNSQuestion::tag);
 243   d_lw->registerMember("requestorId", &DNSQuestion::requestorId);
 244   d_lw->registerMember("deviceId", &DNSQuestion::deviceId);
 245   d_lw->registerMember("deviceName", &DNSQuestion::deviceName);
 246   d_lw->registerMember("followupFunction", &DNSQuestion::followupFunction);
 247   d_lw->registerMember("followupPrefix", &DNSQuestion::followupPrefix);
 248   d_lw->registerMember("followupName", &DNSQuestion::followupName);
 249   d_lw->registerMember("data", &DNSQuestion::data);
 250   d_lw->registerMember("udpQuery", &DNSQuestion::udpQuery);
 251   d_lw->registerMember("udpAnswer", &DNSQuestion::udpAnswer);
 252   d_lw->registerMember("udpQueryDest", &DNSQuestion::udpQueryDest);
 253   d_lw->registerMember("udpCallback", &DNSQuestion::udpCallback);
 254   d_lw->registerMember("appliedPolicy", &DNSQuestion::appliedPolicy);
 255   d_lw->registerMember<DNSFilterEngine::Policy, std::string>("policyName",
 256     [](const DNSFilterEngine::Policy& pol) -> std::string {
 257       if(pol.d_name)
 258         return *pol.d_name;
 259       return std::string();
 260     },
 261     [](DNSFilterEngine::Policy& pol, const std::string& name) {
 262       pol.d_name = std::make_shared<std::string>(name);
 263     });
 264   d_lw->registerMember("policyKind", &DNSFilterEngine::Policy::d_kind);
 265   d_lw->registerMember("policyTTL", &DNSFilterEngine::Policy::d_ttl);
 266   d_lw->registerMember<DNSFilterEngine::Policy, std::string>("policyCustom",
 267     [](const DNSFilterEngine::Policy& pol) -> std::string {
 268       std::string result;
 269       if (pol.d_kind != DNSFilterEngine::PolicyKind::Custom) {
 270         return result;
 271       }
 272
 273       for (const auto& dr : pol.d_custom) {
 274         if (!result.empty()) {
 275           result += "\n";
 276         }
 277         result += dr->getZoneRepresentation();
 278       }
 279
 280       return result;
 281     },
 282     [](DNSFilterEngine::Policy& pol, const std::string& content) {
 283       // Only CNAMES for now, when we ever add a d_custom_type, there will be pain
 284       pol.d_custom.clear();
 285       pol.d_custom.push_back(DNSRecordContent::mastermake(QType::CNAME, QClass::IN, content));
 286     }
 287   );
 288   d_lw->registerFunction("getDH", &DNSQuestion::getDH);
 289   d_lw->registerFunction("getEDNSOptions", &DNSQuestion::getEDNSOptions);
 290   d_lw->registerFunction("getEDNSOption", &DNSQuestion::getEDNSOption);
 291   d_lw->registerFunction("getEDNSSubnet", &DNSQuestion::getEDNSSubnet);
 292   d_lw->registerFunction("getEDNSFlags", &DNSQuestion::getEDNSFlags);
 293   d_lw->registerFunction("getEDNSFlag", &DNSQuestion::getEDNSFlag);
 294   d_lw->registerMember("name", &DNSRecord::d_name);
 295   d_lw->registerMember("type", &DNSRecord::d_type);
 296   d_lw->registerMember("ttl", &DNSRecord::d_ttl);
 297   d_lw->registerMember("place", &DNSRecord::d_place);
 298
 299   d_lw->registerMember("size", &EDNSOptionViewValue::size);
 300   d_lw->registerFunction<std::string(EDNSOptionViewValue::*)()>("getContent", [](const EDNSOptionViewValue& value) { return std::string(value.content, value.size); });
 301   d_lw->registerFunction<size_t(EDNSOptionView::*)()>("count", [](const EDNSOptionView& option) { return option.values.size(); });
 302   d_lw->registerFunction<std::vector<string>(EDNSOptionView::*)()>("getValues", [] (const EDNSOptionView& option) {
 303       std::vector<string> values;
 304       for (const auto& value : option.values) {
 305         values.push_back(std::string(value.content, value.size));
 306       }
 307       return values;
 308     });
 309
 310   /* pre 4.2 API compatibility, when we had only one value for a given EDNS option */
 311   d_lw->registerMember<uint16_t(EDNSOptionView::*)>("size", [](const EDNSOptionView& option) -> uint16_t {
 312       uint16_t result = 0;
 313
 314       if (!option.values.empty()) {
 315         result = option.values.at(0).size;
 316       }
 317       return result;
 318     },
 319     [](EDNSOptionView& option, uint16_t newSize) { (void) newSize; });
 320   d_lw->registerFunction<std::string(EDNSOptionView::*)()>("getContent", [](const EDNSOptionView& option) {
 321       if (option.values.empty()) {
 322         return std::string();
 323       }
 324       return std::string(option.values.at(0).content, option.values.at(0).size); });
 325
 326   d_lw->registerFunction<string(DNSRecord::*)()>("getContent", [](const DNSRecord& dr) { return dr.d_content->getZoneRepresentation(); });
 327   d_lw->registerFunction<boost::optional<ComboAddress>(DNSRecord::*)()>("getCA", [](const DNSRecord& dr) {
 328       boost::optional<ComboAddress> ret;
 329
 330       if(auto rec = std::dynamic_pointer_cast<ARecordContent>(dr.d_content))
 331         ret=rec->getCA(53);
 332       else if(auto aaaarec = std::dynamic_pointer_cast<AAAARecordContent>(dr.d_content))
 333         ret=aaaarec->getCA(53);
 334       return ret;
 335     });
 336
 337
 338   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); });
 339   d_lw->registerFunction("addAnswer", &DNSQuestion::addAnswer);
 340   d_lw->registerFunction("addRecord", &DNSQuestion::addRecord);
 341   d_lw->registerFunction("getRecords", &DNSQuestion::getRecords);
 342   d_lw->registerFunction("setRecords", &DNSQuestion::setRecords);
 343
 344   d_lw->registerFunction<void(DNSQuestion::*)(const std::string&)>("addPolicyTag", [](DNSQuestion& dq, const std::string& tag) { if (dq.policyTags) { dq.policyTags->push_back(tag); } });
 345   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) {
 346       if (dq.policyTags) {
 347         dq.policyTags->clear();
 348         for (const auto& tag : tags) {
 349           dq.policyTags->push_back(tag.second);
 350         }
 351       }
 352     });
 353   d_lw->registerFunction<std::vector<std::pair<int, std::string> >(DNSQuestion::*)()>("getPolicyTags", [](const DNSQuestion& dq) {
 354       std::vector<std::pair<int, std::string> > ret;
 355       if (dq.policyTags) {
 356         int count = 1;
 357         for (const auto& tag : *dq.policyTags) {
 358           ret.push_back({count++, tag});
 359         }
 360       }
 361       return ret;
 362     });
 363
 364   d_lw->registerFunction<void(DNSQuestion::*)(const std::string&)>("discardPolicy", [](DNSQuestion& dq, const std::string& policy) {
 365       if (dq.discardedPolicies) {
 366         (*dq.discardedPolicies)[policy] = true;
 367       }
 368     });
 369
 370   d_lw->writeFunction("newDS", []() { return SuffixMatchNode(); });
 371   d_lw->registerFunction<void(SuffixMatchNode::*)(boost::variant<string,DNSName, vector<pair<unsigned int,string> > >)>(
 372     "add",
 373     [](SuffixMatchNode&smn, const boost::variant<string,DNSName,vector<pair<unsigned int,string> > >& in){
 374       try {
 375         if(auto s = boost::get<string>(&in)) {
 376           smn.add(DNSName(*s));
 377         }
 378         else if(auto v = boost::get<vector<pair<unsigned int, string> > >(&in)) {
 379           for(const auto& entry : *v)
 380             smn.add(DNSName(entry.second));
 381         }
 382         else {
 383           smn.add(boost::get<DNSName>(in));
 384         }
 385       }
 386       catch(std::exception& e) {
 387         g_log <<Logger::Error<<e.what()<<endl;
 388       }
 389     }
 390   );
 391
 392   d_lw->registerFunction("check",(bool (SuffixMatchNode::*)(const DNSName&) const) &SuffixMatchNode::check);
 393   d_lw->registerFunction("toString",(string (SuffixMatchNode::*)() const) &SuffixMatchNode::toString);
 394
 395   d_pd.push_back({"policykinds", in_t {
 396     {"NoAction", (int)DNSFilterEngine::PolicyKind::NoAction},
 397     {"Drop",     (int)DNSFilterEngine::PolicyKind::Drop    },
 398     {"NXDOMAIN", (int)DNSFilterEngine::PolicyKind::NXDOMAIN},
 399     {"NODATA",   (int)DNSFilterEngine::PolicyKind::NODATA  },
 400     {"Truncate", (int)DNSFilterEngine::PolicyKind::Truncate},
 401     {"Custom",   (int)DNSFilterEngine::PolicyKind::Custom  }
 402     }});
 403
 404   for(const auto& n : QType::names)
 405     d_pd.push_back({n.first, n.second});
 406
 407   d_pd.push_back({"validationstates", in_t{
 408         {"Indeterminate", Indeterminate },
 409         {"Bogus", Bogus },
 410         {"Insecure", Insecure },
 411         {"Secure", Secure },
 412   }});
 413
 414   d_pd.push_back({"now", &g_now});
 415
 416   d_lw->writeFunction("getMetric", [](const std::string& str) {
 417       return DynMetric{getDynMetric(str)};
 418     });
 419
 420   d_lw->registerFunction("inc", &DynMetric::inc);
 421   d_lw->registerFunction("incBy", &DynMetric::incBy);
 422   d_lw->registerFunction("set", &DynMetric::set);
 423   d_lw->registerFunction("get", &DynMetric::get);
 424
 425   d_lw->writeFunction("getStat", [](const std::string& str) {
 426       uint64_t result = 0;
 427       optional<uint64_t> value = getStatByName(str);
 428       if (value) {
 429         result = *value;
 430       }
 431       return result;
 432     });
 433
 434   d_lw->writeFunction("getRecursorThreadId", []() {
 435       return getRecursorThreadId();
 436     });
 437
 438   d_lw->writeFunction("sendCustomSNMPTrap", [](const std::string& str) {
 439       if (g_snmpAgent) {
 440         g_snmpAgent->sendCustomTrap(str);
 441       }
 442     });
 443
 444   d_lw->writeFunction("getregisteredname", [](const DNSName &dname) {
 445       return getRegisteredName(dname);
 446   });
 447 }
 448
 449 void RecursorLua4::postLoad() {
 450   d_prerpz = d_lw->readVariable<boost::optional<luacall_t>>("prerpz").get_value_or(0);
 451   d_preresolve = d_lw->readVariable<boost::optional<luacall_t>>("preresolve").get_value_or(0);
 452   d_nodata = d_lw->readVariable<boost::optional<luacall_t>>("nodata").get_value_or(0);
 453   d_nxdomain = d_lw->readVariable<boost::optional<luacall_t>>("nxdomain").get_value_or(0);
 454   d_postresolve = d_lw->readVariable<boost::optional<luacall_t>>("postresolve").get_value_or(0);
 455   d_preoutquery = d_lw->readVariable<boost::optional<luacall_t>>("preoutquery").get_value_or(0);
 456   d_maintenance = d_lw->readVariable<boost::optional<luamaintenance_t>>("maintenance").get_value_or(0);
 457
 458   d_ipfilter = d_lw->readVariable<boost::optional<ipfilter_t>>("ipfilter").get_value_or(0);
 459   d_gettag = d_lw->readVariable<boost::optional<gettag_t>>("gettag").get_value_or(0);
 460   d_gettag_ffi = d_lw->readVariable<boost::optional<gettag_ffi_t>>("gettag_ffi").get_value_or(0);
 461 }
 462
 463 void RecursorLua4::maintenance() const
 464 {
 465   if (d_maintenance) {
 466     d_maintenance();
 467   }
 468 }
 469
 470 bool RecursorLua4::prerpz(DNSQuestion& dq, int& ret) const
 471 {
 472   return genhook(d_prerpz, dq, ret);
 473 }
 474
 475 bool RecursorLua4::preresolve(DNSQuestion& dq, int& ret) const
 476 {
 477   return genhook(d_preresolve, dq, ret);
 478 }
 479
 480 bool RecursorLua4::nxdomain(DNSQuestion& dq, int& ret) const
 481 {
 482   return genhook(d_nxdomain, dq, ret);
 483 }
 484
 485 bool RecursorLua4::nodata(DNSQuestion& dq, int& ret) const
 486 {
 487   return genhook(d_nodata, dq, ret);
 488 }
 489
 490 bool RecursorLua4::postresolve(DNSQuestion& dq, int& ret) const
 491 {
 492   return genhook(d_postresolve, dq, ret);
 493 }
 494
 495 bool RecursorLua4::preoutquery(const ComboAddress& ns, const ComboAddress& requestor, const DNSName& query, const QType& qtype, bool isTcp, vector<DNSRecord>& res, int& ret) const
 496 {
 497   bool variableAnswer = false;
 498   bool wantsRPZ = false;
 499   bool logQuery = false;
 500   RecursorLua4::DNSQuestion dq(ns, requestor, query, qtype.getCode(), isTcp, variableAnswer, wantsRPZ, logQuery);
 501   dq.currentRecords = &res;
 502
 503   return genhook(d_preoutquery, dq, ret);
 504 }
 505
 506 bool RecursorLua4::ipfilter(const ComboAddress& remote, const ComboAddress& local, const struct dnsheader& dh) const
 507 {
 508   if(d_ipfilter)
 509     return d_ipfilter(remote, local, dh);
 510   return false; // don't block
 511 }
 512
 513 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 EDNSOptionViewMap& ednsOptions, bool tcp, std::string& requestorId, std::string& deviceId, std::string& deviceName) const
 514 {
 515   if(d_gettag) {
 516     auto ret = d_gettag(remote, ednssubnet, local, qname, qtype, ednsOptions, tcp);
 517
 518     if (policyTags) {
 519       const auto& tags = std::get<1>(ret);
 520       if (tags) {
 521         for (const auto& tag : *tags) {
 522           policyTags->push_back(tag.second);
 523         }
 524       }
 525     }
 526     const auto dataret = std::get<2>(ret);
 527     if (dataret) {
 528       data = *dataret;
 529     }
 530     const auto reqIdret = std::get<3>(ret);
 531     if (reqIdret) {
 532       requestorId = *reqIdret;
 533     }
 534     const auto deviceIdret = std::get<4>(ret);
 535     if (deviceIdret) {
 536       deviceId = *deviceIdret;
 537     }
 538
 539     const auto deviceNameret = std::get<5>(ret);
 540     if (deviceNameret) {
 541       deviceName = *deviceNameret;
 542     }
 543     return std::get<0>(ret);
 544   }
 545   return 0;
 546 }
 547
 548 struct pdns_ffi_param
 549 {
 550 public:
 551   pdns_ffi_param(const DNSName& qname_, uint16_t qtype_, const ComboAddress& local_, const ComboAddress& remote_, const Netmask& ednssubnet_, std::vector<std::string>& policyTags_, std::vector<DNSRecord>& records_, const EDNSOptionViewMap& ednsOptions_, 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_), requestorId(requestorId_), deviceId(deviceId_), deviceName(deviceName_), rcode(rcode_), ttlCap(ttlCap_), variable(variable_), logQuery(logQuery_), logResponse(logResponse_), followCNAMERecords(followCNAMERecords_), qtype(qtype_), tcp(tcp_)
 552   {
 553   }
 554
 555   std::unique_ptr<std::string> qnameStr{nullptr};
 556   std::unique_ptr<std::string> localStr{nullptr};
 557   std::unique_ptr<std::string> remoteStr{nullptr};
 558   std::unique_ptr<std::string> ednssubnetStr{nullptr};
 559   std::vector<pdns_ednsoption_t> ednsOptionsVect;
 560
 561   const DNSName& qname;
 562   const ComboAddress& local;
 563   const ComboAddress& remote;
 564   const Netmask& ednssubnet;
 565   std::vector<std::string>& policyTags;
 566   std::vector<DNSRecord>& records;
 567   const EDNSOptionViewMap& ednsOptions;
 568   std::string& requestorId;
 569   std::string& deviceId;
 570   std::string& deviceName;
 571   boost::optional<int>& rcode;
 572   uint32_t& ttlCap;
 573   bool& variable;
 574   bool& logQuery;
 575   bool& logResponse;
 576   bool& followCNAMERecords;
 577
 578   unsigned int tag{0};
 579   uint16_t qtype;
 580   bool tcp;
 581 };
 582
 583 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, std::vector<DNSRecord>& records, LuaContext::LuaObject& data, const EDNSOptionViewMap& ednsOptions, bool tcp, 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
 584 {
 585   if (d_gettag_ffi) {
 586     pdns_ffi_param_t param(qname, qtype, local, remote, ednssubnet, *policyTags, records, ednsOptions, requestorId, deviceId, deviceName, rcode, ttlCap, variable, tcp, logQuery, logResponse, followCNAMERecords);
 587
 588     auto ret = d_gettag_ffi(&param);
 589     if (ret) {
 590       data = *ret;
 591     }
 592
 593     return param.tag;
 594   }
 595   return 0;
 596 }
 597
 598 bool RecursorLua4::genhook(const luacall_t& func, DNSQuestion& dq, int& ret) const
 599 {
 600   if(!func)
 601     return false;
 602
 603   if (dq.currentRecords) {
 604     dq.records = *dq.currentRecords;
 605   } else {
 606     dq.records.clear();
 607   }
 608
 609   dq.followupFunction.clear();
 610   dq.followupPrefix.clear();
 611   dq.followupName.clear();
 612   dq.udpQuery.clear();
 613   dq.udpAnswer.clear();
 614   dq.udpCallback.clear();
 615
 616   dq.rcode = ret;
 617   bool handled=func(&dq);
 618
 619   if(handled) {
 620 loop:;
 621     ret=dq.rcode;
 622
 623     if(!dq.followupFunction.empty()) {
 624       if(dq.followupFunction=="followCNAMERecords") {
 625         ret = followCNAMERecords(dq.records, QType(dq.qtype));
 626       }
 627       else if(dq.followupFunction=="getFakeAAAARecords") {
 628         ret=getFakeAAAARecords(dq.followupName, dq.followupPrefix, dq.records);
 629       }
 630       else if(dq.followupFunction=="getFakePTRRecords") {
 631         ret=getFakePTRRecords(dq.followupName, dq.followupPrefix, dq.records);
 632       }
 633       else if(dq.followupFunction=="udpQueryResponse") {
 634         dq.udpAnswer = GenUDPQueryResponse(dq.udpQueryDest, dq.udpQuery);
 635         auto cbFunc = d_lw->readVariable<boost::optional<luacall_t>>(dq.udpCallback).get_value_or(0);
 636         if(!cbFunc) {
 637           g_log<<Logger::Error<<"Attempted callback for Lua UDP Query/Response which could not be found"<<endl;
 638           return false;
 639         }
 640         bool result=cbFunc(&dq);
 641         if(!result) {
 642           return false;
 643         }
 644         goto loop;
 645       }
 646     }
 647     if (dq.currentRecords) {
 648       *dq.currentRecords = dq.records;
 649     }
 650   }
 651
 652   // see if they added followup work for us too
 653   return handled;
 654 }
 655
 656 RecursorLua4::~RecursorLua4(){}
 657
 658 const char* pdns_ffi_param_get_qname(pdns_ffi_param_t* ref)
 659 {
 660   if (!ref->qnameStr) {
 661     ref->qnameStr = std::unique_ptr<std::string>(new std::string(ref->qname.toStringNoDot()));
 662   }
 663
 664   return ref->qnameStr->c_str();
 665 }
 666
 667 void pdns_ffi_param_get_qname_raw(pdns_ffi_param_t* ref, const char** qname, size_t* qnameSize)
 668 {
 669   const auto& storage = ref->qname.getStorage();
 670   *qname = storage.data();
 671   *qnameSize = storage.size();
 672 }
 673
 674 uint16_t pdns_ffi_param_get_qtype(const pdns_ffi_param_t* ref)
 675 {
 676   return ref->qtype;
 677 }
 678
 679 const char* pdns_ffi_param_get_remote(pdns_ffi_param_t* ref)
 680 {
 681   if (!ref->remoteStr) {
 682     ref->remoteStr = std::unique_ptr<std::string>(new std::string(ref->remote.toString()));
 683   }
 684
 685   return ref->remoteStr->c_str();
 686 }
 687
 688 static void pdns_ffi_comboaddress_to_raw(const ComboAddress& ca, const void** addr, size_t* addrSize)
 689 {
 690   if (ca.isIPv4()) {
 691     *addr = &ca.sin4.sin_addr.s_addr;
 692     *addrSize = sizeof(ca.sin4.sin_addr.s_addr);
 693   }
 694   else {
 695     *addr = &ca.sin6.sin6_addr.s6_addr;
 696     *addrSize = sizeof(ca.sin6.sin6_addr.s6_addr);
 697   }
 698 }
 699
 700 void pdns_ffi_param_get_remote_raw(pdns_ffi_param_t* ref, const void** addr, size_t* addrSize)
 701 {
 702   pdns_ffi_comboaddress_to_raw(ref->remote, addr, addrSize);
 703 }
 704
 705 uint16_t pdns_ffi_param_get_remote_port(const pdns_ffi_param_t* ref)
 706 {
 707   return ref->remote.getPort();
 708 }
 709
 710 const char* pdns_ffi_param_get_local(pdns_ffi_param_t* ref)
 711 {
 712   if (!ref->localStr) {
 713     ref->localStr = std::unique_ptr<std::string>(new std::string(ref->local.toString()));
 714   }
 715
 716   return ref->localStr->c_str();
 717 }
 718
 719 void pdns_ffi_param_get_local_raw(pdns_ffi_param_t* ref, const void** addr, size_t* addrSize)
 720 {
 721   pdns_ffi_comboaddress_to_raw(ref->local, addr, addrSize);
 722 }
 723
 724 uint16_t pdns_ffi_param_get_local_port(const pdns_ffi_param_t* ref)
 725 {
 726   return ref->local.getPort();
 727 }
 728
 729 const char* pdns_ffi_param_get_edns_cs(pdns_ffi_param_t* ref)
 730 {
 731   if (ref->ednssubnet.empty()) {
 732     return nullptr;
 733   }
 734
 735   if (!ref->ednssubnetStr) {
 736     ref->ednssubnetStr = std::unique_ptr<std::string>(new std::string(ref->ednssubnet.toStringNoMask()));
 737   }
 738
 739   return ref->ednssubnetStr->c_str();
 740 }
 741
 742 void pdns_ffi_param_get_edns_cs_raw(pdns_ffi_param_t* ref, const void** net, size_t* netSize)
 743 {
 744   if (ref->ednssubnet.empty()) {
 745     *net = nullptr;
 746     *netSize = 0;
 747     return;
 748   }
 749
 750   pdns_ffi_comboaddress_to_raw(ref->ednssubnet.getNetwork(), net, netSize);
 751 }
 752
 753 uint8_t pdns_ffi_param_get_edns_cs_source_mask(const pdns_ffi_param_t* ref)
 754 {
 755   return ref->ednssubnet.getBits();
 756 }
 757
 758 static void fill_edns_option(const EDNSOptionViewValue& value, pdns_ednsoption_t& option)
 759 {
 760   option.len = value.size;
 761   option.data = nullptr;
 762
 763   if (value.size > 0) {
 764     option.data = value.content;
 765   }
 766 }
 767
 768 size_t pdns_ffi_param_get_edns_options(pdns_ffi_param_t* ref, const pdns_ednsoption_t** out)
 769 {
 770   if (ref->ednsOptions.empty()) {
 771     return 0;
 772   }
 773
 774   size_t totalCount = 0;
 775   for (const auto& option : ref->ednsOptions) {
 776     totalCount += option.second.values.size();
 777   }
 778
 779   ref->ednsOptionsVect.resize(totalCount);
 780
 781   size_t pos = 0;
 782   for (const auto& option : ref->ednsOptions) {
 783     for (const auto& entry : option.second.values) {
 784       fill_edns_option(entry, ref->ednsOptionsVect.at(pos));
 785       ref->ednsOptionsVect.at(pos).optionCode = option.first;
 786       pos++;
 787     }
 788   }
 789
 790   *out = ref->ednsOptionsVect.data();
 791
 792   return totalCount;
 793 }
 794
 795 size_t pdns_ffi_param_get_edns_options_by_code(pdns_ffi_param_t* ref, uint16_t optionCode, const pdns_ednsoption_t** out)
 796 {
 797   const auto& it = ref->ednsOptions.find(optionCode);
 798   if (it == ref->ednsOptions.cend() || it->second.values.empty()) {
 799     return 0;
 800   }
 801
 802   ref->ednsOptionsVect.resize(it->second.values.size());
 803
 804   size_t pos = 0;
 805   for (const auto& entry : it->second.values) {
 806     fill_edns_option(entry, ref->ednsOptionsVect.at(pos));
 807     ref->ednsOptionsVect.at(pos).optionCode = optionCode;
 808     pos++;
 809   }
 810
 811   *out = ref->ednsOptionsVect.data();
 812
 813   return pos;
 814 }
 815
 816 void pdns_ffi_param_set_tag(pdns_ffi_param_t* ref, unsigned int tag)
 817 {
 818   ref->tag = tag;
 819 }
 820
 821 void pdns_ffi_param_add_policytag(pdns_ffi_param_t *ref, const char* name)
 822 {
 823   ref->policyTags.push_back(std::string(name));
 824 }
 825
 826 void pdns_ffi_param_set_requestorid(pdns_ffi_param_t* ref, const char* name)
 827 {
 828   ref->requestorId = std::string(name);
 829 }
 830
 831 void pdns_ffi_param_set_devicename(pdns_ffi_param_t* ref, const char* name)
 832 {
 833   ref->deviceName = std::string(name);
 834 }
 835
 836 void pdns_ffi_param_set_deviceid(pdns_ffi_param_t* ref, size_t len, const void* name)
 837 {
 838   ref->deviceId = std::string(reinterpret_cast<const char*>(name), len);
 839 }
 840
 841 void pdns_ffi_param_set_variable(pdns_ffi_param_t* ref, bool variable)
 842 {
 843   ref->variable = variable;
 844 }
 845
 846 void pdns_ffi_param_set_ttl_cap(pdns_ffi_param_t* ref, uint32_t ttl)
 847 {
 848   ref->ttlCap = ttl;
 849 }
 850
 851 void pdns_ffi_param_set_log_query(pdns_ffi_param_t* ref, bool logQuery)
 852 {
 853   ref->logQuery = logQuery;
 854 }
 855
 856 void pdns_ffi_param_set_log_response(pdns_ffi_param_t* ref, bool logResponse)
 857 {
 858   ref->logResponse = logResponse;
 859 }
 860
 861 void pdns_ffi_param_set_rcode(pdns_ffi_param_t* ref, int rcode)
 862 {
 863   ref->rcode = rcode;
 864 }
 865
 866 void pdns_ffi_param_set_follow_cname_records(pdns_ffi_param_t* ref, bool follow)
 867 {
 868   ref->followCNAMERecords = follow;
 869 }
 870
 871 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)
 872 {
 873   try {
 874     DNSRecord dr;
 875     dr.d_name = name != nullptr ? DNSName(name) : ref->qname;
 876     dr.d_ttl = ttl;
 877     dr.d_type = type;
 878     dr.d_class = QClass::IN;
 879     dr.d_place = DNSResourceRecord::Place(place);
 880     dr.d_content = DNSRecordContent::mastermake(type, QClass::IN, std::string(content, contentSize));
 881     ref->records.push_back(std::move(dr));
 882
 883     return true;
 884   }
 885   catch (const std::exception& e) {
 886     g_log<<Logger::Error<<"Error attempting to add a record from Lua via pdns_ffi_param_add_record(): "<<e.what()<<endl;
 887     return false;
 888   }
 889 }