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::getFeatures(Features & features) {
 464   // Add key-values pairs below.
 465   // Make sure you add string values explicity converted to string.
 466   // e.g. features.push_back(make_pair("somekey", string("stringvalue"));
 467   // Both int and double end up as a lua number type.
 468    features.push_back(make_pair("PR8001_devicename", true));
 469 }
 470
 471 void RecursorLua4::maintenance() const
 472 {
 473   if (d_maintenance) {
 474     d_maintenance();
 475   }
 476 }
 477
 478 bool RecursorLua4::prerpz(DNSQuestion& dq, int& ret) const
 479 {
 480   return genhook(d_prerpz, dq, ret);
 481 }
 482
 483 bool RecursorLua4::preresolve(DNSQuestion& dq, int& ret) const
 484 {
 485   return genhook(d_preresolve, dq, ret);
 486 }
 487
 488 bool RecursorLua4::nxdomain(DNSQuestion& dq, int& ret) const
 489 {
 490   return genhook(d_nxdomain, dq, ret);
 491 }
 492
 493 bool RecursorLua4::nodata(DNSQuestion& dq, int& ret) const
 494 {
 495   return genhook(d_nodata, dq, ret);
 496 }
 497
 498 bool RecursorLua4::postresolve(DNSQuestion& dq, int& ret) const
 499 {
 500   return genhook(d_postresolve, dq, ret);
 501 }
 502
 503 bool RecursorLua4::preoutquery(const ComboAddress& ns, const ComboAddress& requestor, const DNSName& query, const QType& qtype, bool isTcp, vector<DNSRecord>& res, int& ret) const
 504 {
 505   bool variableAnswer = false;
 506   bool wantsRPZ = false;
 507   bool logQuery = false;
 508   RecursorLua4::DNSQuestion dq(ns, requestor, query, qtype.getCode(), isTcp, variableAnswer, wantsRPZ, logQuery);
 509   dq.currentRecords = &res;
 510
 511   return genhook(d_preoutquery, dq, ret);
 512 }
 513
 514 bool RecursorLua4::ipfilter(const ComboAddress& remote, const ComboAddress& local, const struct dnsheader& dh) const
 515 {
 516   if(d_ipfilter)
 517     return d_ipfilter(remote, local, dh);
 518   return false; // don't block
 519 }
 520
 521 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
 522 {
 523   if(d_gettag) {
 524     auto ret = d_gettag(remote, ednssubnet, local, qname, qtype, ednsOptions, tcp);
 525
 526     if (policyTags) {
 527       const auto& tags = std::get<1>(ret);
 528       if (tags) {
 529         for (const auto& tag : *tags) {
 530           policyTags->push_back(tag.second);
 531         }
 532       }
 533     }
 534     const auto dataret = std::get<2>(ret);
 535     if (dataret) {
 536       data = *dataret;
 537     }
 538     const auto reqIdret = std::get<3>(ret);
 539     if (reqIdret) {
 540       requestorId = *reqIdret;
 541     }
 542     const auto deviceIdret = std::get<4>(ret);
 543     if (deviceIdret) {
 544       deviceId = *deviceIdret;
 545     }
 546
 547     const auto deviceNameret = std::get<5>(ret);
 548     if (deviceNameret) {
 549       deviceName = *deviceNameret;
 550     }
 551     return std::get<0>(ret);
 552   }
 553   return 0;
 554 }
 555
 556 struct pdns_ffi_param
 557 {
 558 public:
 559   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_)
 560   {
 561   }
 562
 563   std::unique_ptr<std::string> qnameStr{nullptr};
 564   std::unique_ptr<std::string> localStr{nullptr};
 565   std::unique_ptr<std::string> remoteStr{nullptr};
 566   std::unique_ptr<std::string> ednssubnetStr{nullptr};
 567   std::vector<pdns_ednsoption_t> ednsOptionsVect;
 568
 569   const DNSName& qname;
 570   const ComboAddress& local;
 571   const ComboAddress& remote;
 572   const Netmask& ednssubnet;
 573   std::vector<std::string>& policyTags;
 574   std::vector<DNSRecord>& records;
 575   const EDNSOptionViewMap& ednsOptions;
 576   std::string& requestorId;
 577   std::string& deviceId;
 578   std::string& deviceName;
 579   boost::optional<int>& rcode;
 580   uint32_t& ttlCap;
 581   bool& variable;
 582   bool& logQuery;
 583   bool& logResponse;
 584   bool& followCNAMERecords;
 585
 586   unsigned int tag{0};
 587   uint16_t qtype;
 588   bool tcp;
 589 };
 590
 591 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
 592 {
 593   if (d_gettag_ffi) {
 594     pdns_ffi_param_t param(qname, qtype, local, remote, ednssubnet, *policyTags, records, ednsOptions, requestorId, deviceId, deviceName, rcode, ttlCap, variable, tcp, logQuery, logResponse, followCNAMERecords);
 595
 596     auto ret = d_gettag_ffi(&param);
 597     if (ret) {
 598       data = *ret;
 599     }
 600
 601     return param.tag;
 602   }
 603   return 0;
 604 }
 605
 606 bool RecursorLua4::genhook(const luacall_t& func, DNSQuestion& dq, int& ret) const
 607 {
 608   if(!func)
 609     return false;
 610
 611   if (dq.currentRecords) {
 612     dq.records = *dq.currentRecords;
 613   } else {
 614     dq.records.clear();
 615   }
 616
 617   dq.followupFunction.clear();
 618   dq.followupPrefix.clear();
 619   dq.followupName.clear();
 620   dq.udpQuery.clear();
 621   dq.udpAnswer.clear();
 622   dq.udpCallback.clear();
 623
 624   dq.rcode = ret;
 625   bool handled=func(&dq);
 626
 627   if(handled) {
 628 loop:;
 629     ret=dq.rcode;
 630
 631     if(!dq.followupFunction.empty()) {
 632       if(dq.followupFunction=="followCNAMERecords") {
 633         ret = followCNAMERecords(dq.records, QType(dq.qtype));
 634       }
 635       else if(dq.followupFunction=="getFakeAAAARecords") {
 636         ret=getFakeAAAARecords(dq.followupName, dq.followupPrefix, dq.records);
 637       }
 638       else if(dq.followupFunction=="getFakePTRRecords") {
 639         ret=getFakePTRRecords(dq.followupName, dq.followupPrefix, dq.records);
 640       }
 641       else if(dq.followupFunction=="udpQueryResponse") {
 642         dq.udpAnswer = GenUDPQueryResponse(dq.udpQueryDest, dq.udpQuery);
 643         auto cbFunc = d_lw->readVariable<boost::optional<luacall_t>>(dq.udpCallback).get_value_or(0);
 644         if(!cbFunc) {
 645           g_log<<Logger::Error<<"Attempted callback for Lua UDP Query/Response which could not be found"<<endl;
 646           return false;
 647         }
 648         bool result=cbFunc(&dq);
 649         if(!result) {
 650           return false;
 651         }
 652         goto loop;
 653       }
 654     }
 655     if (dq.currentRecords) {
 656       *dq.currentRecords = dq.records;
 657     }
 658   }
 659
 660   // see if they added followup work for us too
 661   return handled;
 662 }
 663
 664 RecursorLua4::~RecursorLua4(){}
 665
 666 const char* pdns_ffi_param_get_qname(pdns_ffi_param_t* ref)
 667 {
 668   if (!ref->qnameStr) {
 669     ref->qnameStr = std::unique_ptr<std::string>(new std::string(ref->qname.toStringNoDot()));
 670   }
 671
 672   return ref->qnameStr->c_str();
 673 }
 674
 675 void pdns_ffi_param_get_qname_raw(pdns_ffi_param_t* ref, const char** qname, size_t* qnameSize)
 676 {
 677   const auto& storage = ref->qname.getStorage();
 678   *qname = storage.data();
 679   *qnameSize = storage.size();
 680 }
 681
 682 uint16_t pdns_ffi_param_get_qtype(const pdns_ffi_param_t* ref)
 683 {
 684   return ref->qtype;
 685 }
 686
 687 const char* pdns_ffi_param_get_remote(pdns_ffi_param_t* ref)
 688 {
 689   if (!ref->remoteStr) {
 690     ref->remoteStr = std::unique_ptr<std::string>(new std::string(ref->remote.toString()));
 691   }
 692
 693   return ref->remoteStr->c_str();
 694 }
 695
 696 static void pdns_ffi_comboaddress_to_raw(const ComboAddress& ca, const void** addr, size_t* addrSize)
 697 {
 698   if (ca.isIPv4()) {
 699     *addr = &ca.sin4.sin_addr.s_addr;
 700     *addrSize = sizeof(ca.sin4.sin_addr.s_addr);
 701   }
 702   else {
 703     *addr = &ca.sin6.sin6_addr.s6_addr;
 704     *addrSize = sizeof(ca.sin6.sin6_addr.s6_addr);
 705   }
 706 }
 707
 708 void pdns_ffi_param_get_remote_raw(pdns_ffi_param_t* ref, const void** addr, size_t* addrSize)
 709 {
 710   pdns_ffi_comboaddress_to_raw(ref->remote, addr, addrSize);
 711 }
 712
 713 uint16_t pdns_ffi_param_get_remote_port(const pdns_ffi_param_t* ref)
 714 {
 715   return ref->remote.getPort();
 716 }
 717
 718 const char* pdns_ffi_param_get_local(pdns_ffi_param_t* ref)
 719 {
 720   if (!ref->localStr) {
 721     ref->localStr = std::unique_ptr<std::string>(new std::string(ref->local.toString()));
 722   }
 723
 724   return ref->localStr->c_str();
 725 }
 726
 727 void pdns_ffi_param_get_local_raw(pdns_ffi_param_t* ref, const void** addr, size_t* addrSize)
 728 {
 729   pdns_ffi_comboaddress_to_raw(ref->local, addr, addrSize);
 730 }
 731
 732 uint16_t pdns_ffi_param_get_local_port(const pdns_ffi_param_t* ref)
 733 {
 734   return ref->local.getPort();
 735 }
 736
 737 const char* pdns_ffi_param_get_edns_cs(pdns_ffi_param_t* ref)
 738 {
 739   if (ref->ednssubnet.empty()) {
 740     return nullptr;
 741   }
 742
 743   if (!ref->ednssubnetStr) {
 744     ref->ednssubnetStr = std::unique_ptr<std::string>(new std::string(ref->ednssubnet.toStringNoMask()));
 745   }
 746
 747   return ref->ednssubnetStr->c_str();
 748 }
 749
 750 void pdns_ffi_param_get_edns_cs_raw(pdns_ffi_param_t* ref, const void** net, size_t* netSize)
 751 {
 752   if (ref->ednssubnet.empty()) {
 753     *net = nullptr;
 754     *netSize = 0;
 755     return;
 756   }
 757
 758   pdns_ffi_comboaddress_to_raw(ref->ednssubnet.getNetwork(), net, netSize);
 759 }
 760
 761 uint8_t pdns_ffi_param_get_edns_cs_source_mask(const pdns_ffi_param_t* ref)
 762 {
 763   return ref->ednssubnet.getBits();
 764 }
 765
 766 static void fill_edns_option(const EDNSOptionViewValue& value, pdns_ednsoption_t& option)
 767 {
 768   option.len = value.size;
 769   option.data = nullptr;
 770
 771   if (value.size > 0) {
 772     option.data = value.content;
 773   }
 774 }
 775
 776 size_t pdns_ffi_param_get_edns_options(pdns_ffi_param_t* ref, const pdns_ednsoption_t** out)
 777 {
 778   if (ref->ednsOptions.empty()) {
 779     return 0;
 780   }
 781
 782   size_t totalCount = 0;
 783   for (const auto& option : ref->ednsOptions) {
 784     totalCount += option.second.values.size();
 785   }
 786
 787   ref->ednsOptionsVect.resize(totalCount);
 788
 789   size_t pos = 0;
 790   for (const auto& option : ref->ednsOptions) {
 791     for (const auto& entry : option.second.values) {
 792       fill_edns_option(entry, ref->ednsOptionsVect.at(pos));
 793       ref->ednsOptionsVect.at(pos).optionCode = option.first;
 794       pos++;
 795     }
 796   }
 797
 798   *out = ref->ednsOptionsVect.data();
 799
 800   return totalCount;
 801 }
 802
 803 size_t pdns_ffi_param_get_edns_options_by_code(pdns_ffi_param_t* ref, uint16_t optionCode, const pdns_ednsoption_t** out)
 804 {
 805   const auto& it = ref->ednsOptions.find(optionCode);
 806   if (it == ref->ednsOptions.cend() || it->second.values.empty()) {
 807     return 0;
 808   }
 809
 810   ref->ednsOptionsVect.resize(it->second.values.size());
 811
 812   size_t pos = 0;
 813   for (const auto& entry : it->second.values) {
 814     fill_edns_option(entry, ref->ednsOptionsVect.at(pos));
 815     ref->ednsOptionsVect.at(pos).optionCode = optionCode;
 816     pos++;
 817   }
 818
 819   *out = ref->ednsOptionsVect.data();
 820
 821   return pos;
 822 }
 823
 824 void pdns_ffi_param_set_tag(pdns_ffi_param_t* ref, unsigned int tag)
 825 {
 826   ref->tag = tag;
 827 }
 828
 829 void pdns_ffi_param_add_policytag(pdns_ffi_param_t *ref, const char* name)
 830 {
 831   ref->policyTags.push_back(std::string(name));
 832 }
 833
 834 void pdns_ffi_param_set_requestorid(pdns_ffi_param_t* ref, const char* name)
 835 {
 836   ref->requestorId = std::string(name);
 837 }
 838
 839 void pdns_ffi_param_set_devicename(pdns_ffi_param_t* ref, const char* name)
 840 {
 841   ref->deviceName = std::string(name);
 842 }
 843
 844 void pdns_ffi_param_set_deviceid(pdns_ffi_param_t* ref, size_t len, const void* name)
 845 {
 846   ref->deviceId = std::string(reinterpret_cast<const char*>(name), len);
 847 }
 848
 849 void pdns_ffi_param_set_variable(pdns_ffi_param_t* ref, bool variable)
 850 {
 851   ref->variable = variable;
 852 }
 853
 854 void pdns_ffi_param_set_ttl_cap(pdns_ffi_param_t* ref, uint32_t ttl)
 855 {
 856   ref->ttlCap = ttl;
 857 }
 858
 859 void pdns_ffi_param_set_log_query(pdns_ffi_param_t* ref, bool logQuery)
 860 {
 861   ref->logQuery = logQuery;
 862 }
 863
 864 void pdns_ffi_param_set_log_response(pdns_ffi_param_t* ref, bool logResponse)
 865 {
 866   ref->logResponse = logResponse;
 867 }
 868
 869 void pdns_ffi_param_set_rcode(pdns_ffi_param_t* ref, int rcode)
 870 {
 871   ref->rcode = rcode;
 872 }
 873
 874 void pdns_ffi_param_set_follow_cname_records(pdns_ffi_param_t* ref, bool follow)
 875 {
 876   ref->followCNAMERecords = follow;
 877 }
 878
 879 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)
 880 {
 881   try {
 882     DNSRecord dr;
 883     dr.d_name = name != nullptr ? DNSName(name) : ref->qname;
 884     dr.d_ttl = ttl;
 885     dr.d_type = type;
 886     dr.d_class = QClass::IN;
 887     dr.d_place = DNSResourceRecord::Place(place);
 888     dr.d_content = DNSRecordContent::mastermake(type, QClass::IN, std::string(content, contentSize));
 889     ref->records.push_back(std::move(dr));
 890
 891     return true;
 892   }
 893   catch (const std::exception& e) {
 894     g_log<<Logger::Error<<"Error attempting to add a record from Lua via pdns_ffi_param_add_record(): "<<e.what()<<endl;
 895     return false;
 896   }
 897 }