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