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   DNSRecord rr;
 115   rr.d_name = qname;
 116   rr.d_type = QType::CNAME;
 117   rr.d_content = std::make_shared<CNAMERecordContent>(newquery);
 118   ret.push_back(rr);
 119
 120   int rcode = directResolve(DNSName(newquery), QType(QType::PTR), 1, ret);
 121
 122   return rcode;
 123
 124 }
 125
 126 boost::optional<dnsheader> RecursorLua4::DNSQuestion::getDH() const
 127 {
 128   if (dh)
 129     return *dh;
 130   return boost::optional<dnsheader>();
 131 }
 132
 133 vector<string> RecursorLua4::DNSQuestion::getEDNSFlags() const
 134 {
 135   vector<string> ret;
 136   if (ednsFlags) {
 137     if (*ednsFlags & EDNSOpts::DNSSECOK)
 138       ret.push_back("DO");
 139   }
 140   return ret;
 141 }
 142
 143 bool RecursorLua4::DNSQuestion::getEDNSFlag(string flag) const
 144 {
 145   if (ednsFlags) {
 146     if (flag == "DO" && (*ednsFlags & EDNSOpts::DNSSECOK))
 147       return true;
 148   }
 149   return false;
 150 }
 151
 152 vector<pair<uint16_t, string> > RecursorLua4::DNSQuestion::getEDNSOptions() const
 153 {
 154   if(ednsOptions)
 155     return *ednsOptions;
 156   else
 157     return vector<pair<uint16_t,string>>();
 158 }
 159
 160 boost::optional<string>  RecursorLua4::DNSQuestion::getEDNSOption(uint16_t code) const
 161 {
 162   if(ednsOptions)
 163     for(const auto& o : *ednsOptions)
 164       if(o.first==code)
 165         return o.second;
 166
 167   return boost::optional<string>();
 168 }
 169
 170 boost::optional<Netmask>  RecursorLua4::DNSQuestion::getEDNSSubnet() const
 171 {
 172   if(ednsOptions) {
 173     for(const auto& o : *ednsOptions) {
 174       if(o.first==EDNSOptionCode::ECS) {
 175         EDNSSubnetOpts eso;
 176         if(getEDNSSubnetOptsFromString(o.second, &eso))
 177           return eso.source;
 178         else
 179           break;
 180       }
 181     }
 182   }
 183   return boost::optional<Netmask>();
 184 }
 185
 186
 187 vector<pair<int, DNSRecord> > RecursorLua4::DNSQuestion::getRecords() const
 188 {
 189   vector<pair<int, DNSRecord> > ret;
 190   int num=1;
 191   for(const auto& r : records) {
 192     ret.push_back({num++, r});
 193   }
 194   return ret;
 195 }
 196 void RecursorLua4::DNSQuestion::setRecords(const vector<pair<int, DNSRecord> >& recs)
 197 {
 198   records.clear();
 199   for(const auto& p : recs) {
 200     records.push_back(p.second);
 201   }
 202 }
 203
 204 void RecursorLua4::DNSQuestion::addRecord(uint16_t type, const std::string& content, DNSResourceRecord::Place place, boost::optional<int> ttl, boost::optional<string> name)
 205 {
 206   DNSRecord dr;
 207   dr.d_name=name ? DNSName(*name) : qname;
 208   dr.d_ttl=ttl.get_value_or(3600);
 209   dr.d_type = type;
 210   dr.d_place = place;
 211   dr.d_content = DNSRecordContent::mastermake(type, 1, content);
 212   records.push_back(dr);
 213 }
 214
 215 void RecursorLua4::DNSQuestion::addAnswer(uint16_t type, const std::string& content, boost::optional<int> ttl, boost::optional<string> name)
 216 {
 217   addRecord(type, content, DNSResourceRecord::ANSWER, ttl, name);
 218 }
 219
 220 struct DynMetric
 221 {
 222   std::atomic<unsigned long>* ptr;
 223   void inc() { (*ptr)++; }
 224   void incBy(unsigned int by) { (*ptr)+= by; }
 225   unsigned long get() { return *ptr; }
 226   void set(unsigned long val) { *ptr =val; }
 227 };
 228
 229 void RecursorLua4::postPrepareContext()
 230 {
 231   d_lw->registerMember<const DNSName (DNSQuestion::*)>("qname", [](const DNSQuestion& dq) -> const DNSName& { return dq.qname; }, [](DNSQuestion& dq, const DNSName& newName) { (void) newName; });
 232   d_lw->registerMember<uint16_t (DNSQuestion::*)>("qtype", [](const DNSQuestion& dq) -> uint16_t { return dq.qtype; }, [](DNSQuestion& dq, uint16_t newType) { (void) newType; });
 233   d_lw->registerMember<bool (DNSQuestion::*)>("isTcp", [](const DNSQuestion& dq) -> bool { return dq.isTcp; }, [](DNSQuestion& dq, bool newTcp) { (void) newTcp; });
 234   d_lw->registerMember<const ComboAddress (DNSQuestion::*)>("localaddr", [](const DNSQuestion& dq) -> const ComboAddress& { return dq.local; }, [](DNSQuestion& dq, const ComboAddress& newLocal) { (void) newLocal; });
 235   d_lw->registerMember<const ComboAddress (DNSQuestion::*)>("remoteaddr", [](const DNSQuestion& dq) -> const ComboAddress& { return dq.remote; }, [](DNSQuestion& dq, const ComboAddress& newRemote) { (void) newRemote; });
 236   d_lw->registerMember<vState (DNSQuestion::*)>("validationState", [](const DNSQuestion& dq) -> vState { return dq.validationState; }, [](DNSQuestion& dq, vState newState) { (void) newState; });
 237
 238   d_lw->registerMember<bool (DNSQuestion::*)>("variable", [](const DNSQuestion& dq) -> bool { return dq.variable; }, [](DNSQuestion& dq, bool newVariable) { dq.variable = newVariable; });
 239   d_lw->registerMember<bool (DNSQuestion::*)>("wantsRPZ", [](const DNSQuestion& dq) -> bool { return dq.wantsRPZ; }, [](DNSQuestion& dq, bool newWantsRPZ) { dq.wantsRPZ = newWantsRPZ; });
 240   d_lw->registerMember<bool (DNSQuestion::*)>("logResponse", [](const DNSQuestion& dq) -> bool { return dq.logResponse; }, [](DNSQuestion& dq, bool newLogResponse) { dq.logResponse = newLogResponse; });
 241
 242   d_lw->registerMember("rcode", &DNSQuestion::rcode);
 243   d_lw->registerMember("tag", &DNSQuestion::tag);
 244   d_lw->registerMember("requestorId", &DNSQuestion::requestorId);
 245   d_lw->registerMember("deviceId", &DNSQuestion::deviceId);
 246   d_lw->registerMember("deviceName", &DNSQuestion::deviceName);
 247   d_lw->registerMember("followupFunction", &DNSQuestion::followupFunction);
 248   d_lw->registerMember("followupPrefix", &DNSQuestion::followupPrefix);
 249   d_lw->registerMember("followupName", &DNSQuestion::followupName);
 250   d_lw->registerMember("data", &DNSQuestion::data);
 251   d_lw->registerMember("udpQuery", &DNSQuestion::udpQuery);
 252   d_lw->registerMember("udpAnswer", &DNSQuestion::udpAnswer);
 253   d_lw->registerMember("udpQueryDest", &DNSQuestion::udpQueryDest);
 254   d_lw->registerMember("udpCallback", &DNSQuestion::udpCallback);
 255   d_lw->registerMember("appliedPolicy", &DNSQuestion::appliedPolicy);
 256   d_lw->registerMember<DNSFilterEngine::Policy, std::string>("policyName",
 257     [](const DNSFilterEngine::Policy& pol) -> std::string {
 258       if(pol.d_name)
 259         return *pol.d_name;
 260       return std::string();
 261     },
 262     [](DNSFilterEngine::Policy& pol, const std::string& name) {
 263       pol.d_name = std::make_shared<std::string>(name);
 264     });
 265   d_lw->registerMember("policyKind", &DNSFilterEngine::Policy::d_kind);
 266   d_lw->registerMember("policyType", &DNSFilterEngine::Policy::d_type);
 267   d_lw->registerMember("policyTTL", &DNSFilterEngine::Policy::d_ttl);
 268   d_lw->registerMember<DNSFilterEngine::Policy, std::string>("policyCustom",
 269     [](const DNSFilterEngine::Policy& pol) -> std::string {
 270       std::string result;
 271       if (pol.d_kind != DNSFilterEngine::PolicyKind::Custom) {
 272         return result;
 273       }
 274
 275       for (const auto& dr : pol.d_custom) {
 276         if (!result.empty()) {
 277           result += "\n";
 278         }
 279         result += dr->getZoneRepresentation();
 280       }
 281
 282       return result;
 283     },
 284     [](DNSFilterEngine::Policy& pol, const std::string& content) {
 285       // Only CNAMES for now, when we ever add a d_custom_type, there will be pain
 286       pol.d_custom.clear();
 287       pol.d_custom.push_back(DNSRecordContent::mastermake(QType::CNAME, QClass::IN, content));
 288     }
 289   );
 290   d_lw->registerFunction("getDH", &DNSQuestion::getDH);
 291   d_lw->registerFunction("getEDNSOptions", &DNSQuestion::getEDNSOptions);
 292   d_lw->registerFunction("getEDNSOption", &DNSQuestion::getEDNSOption);
 293   d_lw->registerFunction("getEDNSSubnet", &DNSQuestion::getEDNSSubnet);
 294   d_lw->registerFunction("getEDNSFlags", &DNSQuestion::getEDNSFlags);
 295   d_lw->registerFunction("getEDNSFlag", &DNSQuestion::getEDNSFlag);
 296   d_lw->registerMember("name", &DNSRecord::d_name);
 297   d_lw->registerMember("type", &DNSRecord::d_type);
 298   d_lw->registerMember("ttl", &DNSRecord::d_ttl);
 299   d_lw->registerMember("place", &DNSRecord::d_place);
 300
 301   d_lw->registerMember("size", &EDNSOptionViewValue::size);
 302   d_lw->registerFunction<std::string(EDNSOptionViewValue::*)()>("getContent", [](const EDNSOptionViewValue& value) { return std::string(value.content, value.size); });
 303   d_lw->registerFunction<size_t(EDNSOptionView::*)()>("count", [](const EDNSOptionView& option) { return option.values.size(); });
 304   d_lw->registerFunction<std::vector<string>(EDNSOptionView::*)()>("getValues", [] (const EDNSOptionView& option) {
 305       std::vector<string> values;
 306       for (const auto& value : option.values) {
 307         values.push_back(std::string(value.content, value.size));
 308       }
 309       return values;
 310     });
 311
 312   /* pre 4.2 API compatibility, when we had only one value for a given EDNS option */
 313   d_lw->registerMember<uint16_t(EDNSOptionView::*)>("size", [](const EDNSOptionView& option) -> uint16_t {
 314       uint16_t result = 0;
 315
 316       if (!option.values.empty()) {
 317         result = option.values.at(0).size;
 318       }
 319       return result;
 320     },
 321     [](EDNSOptionView& option, uint16_t newSize) { (void) newSize; });
 322   d_lw->registerFunction<std::string(EDNSOptionView::*)()>("getContent", [](const EDNSOptionView& option) {
 323       if (option.values.empty()) {
 324         return std::string();
 325       }
 326       return std::string(option.values.at(0).content, option.values.at(0).size); });
 327
 328   d_lw->registerFunction<string(DNSRecord::*)()>("getContent", [](const DNSRecord& dr) { return dr.d_content->getZoneRepresentation(); });
 329   d_lw->registerFunction<boost::optional<ComboAddress>(DNSRecord::*)()>("getCA", [](const DNSRecord& dr) {
 330       boost::optional<ComboAddress> ret;
 331
 332       if(auto rec = std::dynamic_pointer_cast<ARecordContent>(dr.d_content))
 333         ret=rec->getCA(53);
 334       else if(auto aaaarec = std::dynamic_pointer_cast<AAAARecordContent>(dr.d_content))
 335         ret=aaaarec->getCA(53);
 336       return ret;
 337     });
 338
 339
 340   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); });
 341   d_lw->registerFunction("addAnswer", &DNSQuestion::addAnswer);
 342   d_lw->registerFunction("addRecord", &DNSQuestion::addRecord);
 343   d_lw->registerFunction("getRecords", &DNSQuestion::getRecords);
 344   d_lw->registerFunction("setRecords", &DNSQuestion::setRecords);
 345
 346   d_lw->registerFunction<void(DNSQuestion::*)(const std::string&)>("addPolicyTag", [](DNSQuestion& dq, const std::string& tag) { if (dq.policyTags) { dq.policyTags->push_back(tag); } });
 347   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) {
 348       if (dq.policyTags) {
 349         dq.policyTags->clear();
 350         for (const auto& tag : tags) {
 351           dq.policyTags->push_back(tag.second);
 352         }
 353       }
 354     });
 355   d_lw->registerFunction<std::vector<std::pair<int, std::string> >(DNSQuestion::*)()>("getPolicyTags", [](const DNSQuestion& dq) {
 356       std::vector<std::pair<int, std::string> > ret;
 357       if (dq.policyTags) {
 358         int count = 1;
 359         for (const auto& tag : *dq.policyTags) {
 360           ret.push_back({count++, tag});
 361         }
 362       }
 363       return ret;
 364     });
 365
 366   d_lw->registerFunction<void(DNSQuestion::*)(const std::string&)>("discardPolicy", [](DNSQuestion& dq, const std::string& policy) {
 367       if (dq.discardedPolicies) {
 368         (*dq.discardedPolicies)[policy] = true;
 369       }
 370     });
 371
 372   d_lw->writeFunction("newDS", []() { return SuffixMatchNode(); });
 373   d_lw->registerFunction<void(SuffixMatchNode::*)(boost::variant<string,DNSName, vector<pair<unsigned int,string> > >)>(
 374     "add",
 375     [](SuffixMatchNode&smn, const boost::variant<string,DNSName,vector<pair<unsigned int,string> > >& in){
 376       try {
 377         if(auto s = boost::get<string>(&in)) {
 378           smn.add(DNSName(*s));
 379         }
 380         else if(auto v = boost::get<vector<pair<unsigned int, string> > >(&in)) {
 381           for(const auto& entry : *v)
 382             smn.add(DNSName(entry.second));
 383         }
 384         else {
 385           smn.add(boost::get<DNSName>(in));
 386         }
 387       }
 388       catch(std::exception& e) {
 389         g_log <<Logger::Error<<e.what()<<endl;
 390       }
 391     }
 392   );
 393
 394   d_lw->registerFunction("check",(bool (SuffixMatchNode::*)(const DNSName&) const) &SuffixMatchNode::check);
 395   d_lw->registerFunction("toString",(string (SuffixMatchNode::*)() const) &SuffixMatchNode::toString);
 396
 397   d_pd.push_back({"policykinds", in_t {
 398     {"NoAction", (int)DNSFilterEngine::PolicyKind::NoAction},
 399     {"Drop",     (int)DNSFilterEngine::PolicyKind::Drop    },
 400     {"NXDOMAIN", (int)DNSFilterEngine::PolicyKind::NXDOMAIN},
 401     {"NODATA",   (int)DNSFilterEngine::PolicyKind::NODATA  },
 402     {"Truncate", (int)DNSFilterEngine::PolicyKind::Truncate},
 403     {"Custom",   (int)DNSFilterEngine::PolicyKind::Custom  }
 404     }});
 405
 406   for(const auto& n : QType::names)
 407     d_pd.push_back({n.first, n.second});
 408
 409   d_pd.push_back({"validationstates", in_t{
 410         {"Indeterminate", Indeterminate },
 411         {"Bogus", Bogus },
 412         {"Insecure", Insecure },
 413         {"Secure", Secure },
 414   }});
 415
 416   d_pd.push_back({"now", &g_now});
 417
 418   d_lw->writeFunction("getMetric", [](const std::string& str) {
 419       return DynMetric{getDynMetric(str)};
 420     });
 421
 422   d_lw->registerFunction("inc", &DynMetric::inc);
 423   d_lw->registerFunction("incBy", &DynMetric::incBy);
 424   d_lw->registerFunction("set", &DynMetric::set);
 425   d_lw->registerFunction("get", &DynMetric::get);
 426
 427   d_lw->writeFunction("getStat", [](const std::string& str) {
 428       uint64_t result = 0;
 429       optional<uint64_t> value = getStatByName(str);
 430       if (value) {
 431         result = *value;
 432       }
 433       return result;
 434     });
 435
 436   d_lw->writeFunction("getRecursorThreadId", []() {
 437       return getRecursorThreadId();
 438     });
 439
 440   d_lw->writeFunction("sendCustomSNMPTrap", [](const std::string& str) {
 441       if (g_snmpAgent) {
 442         g_snmpAgent->sendCustomTrap(str);
 443       }
 444     });
 445
 446   d_lw->writeFunction("getregisteredname", [](const DNSName &dname) {
 447       return getRegisteredName(dname);
 448   });
 449 }
 450
 451 void RecursorLua4::postLoad() {
 452   d_prerpz = d_lw->readVariable<boost::optional<luacall_t>>("prerpz").get_value_or(0);
 453   d_preresolve = d_lw->readVariable<boost::optional<luacall_t>>("preresolve").get_value_or(0);
 454   d_nodata = d_lw->readVariable<boost::optional<luacall_t>>("nodata").get_value_or(0);
 455   d_nxdomain = d_lw->readVariable<boost::optional<luacall_t>>("nxdomain").get_value_or(0);
 456   d_postresolve = d_lw->readVariable<boost::optional<luacall_t>>("postresolve").get_value_or(0);
 457   d_preoutquery = d_lw->readVariable<boost::optional<luacall_t>>("preoutquery").get_value_or(0);
 458   d_maintenance = d_lw->readVariable<boost::optional<luamaintenance_t>>("maintenance").get_value_or(0);
 459
 460   d_ipfilter = d_lw->readVariable<boost::optional<ipfilter_t>>("ipfilter").get_value_or(0);
 461   d_gettag = d_lw->readVariable<boost::optional<gettag_t>>("gettag").get_value_or(0);
 462   d_gettag_ffi = d_lw->readVariable<boost::optional<gettag_ffi_t>>("gettag_ffi").get_value_or(0);
 463 }
 464
 465 void RecursorLua4::getFeatures(Features & features) {
 466   // Add key-values pairs below.
 467   // Make sure you add string values explicity converted to string.
 468   // e.g. features.push_back(make_pair("somekey", string("stringvalue"));
 469   // Both int and double end up as a lua number type.
 470    features.push_back(make_pair("PR8001_devicename", true));
 471 }
 472
 473 void RecursorLua4::maintenance() const
 474 {
 475   if (d_maintenance) {
 476     d_maintenance();
 477   }
 478 }
 479
 480 bool RecursorLua4::prerpz(DNSQuestion& dq, int& ret) const
 481 {
 482   return genhook(d_prerpz, dq, ret);
 483 }
 484
 485 bool RecursorLua4::preresolve(DNSQuestion& dq, int& ret) const
 486 {
 487   return genhook(d_preresolve, dq, ret);
 488 }
 489
 490 bool RecursorLua4::nxdomain(DNSQuestion& dq, int& ret) const
 491 {
 492   return genhook(d_nxdomain, dq, ret);
 493 }
 494
 495 bool RecursorLua4::nodata(DNSQuestion& dq, int& ret) const
 496 {
 497   return genhook(d_nodata, dq, ret);
 498 }
 499
 500 bool RecursorLua4::postresolve(DNSQuestion& dq, int& ret) const
 501 {
 502   return genhook(d_postresolve, dq, ret);
 503 }
 504
 505 bool RecursorLua4::preoutquery(const ComboAddress& ns, const ComboAddress& requestor, const DNSName& query, const QType& qtype, bool isTcp, vector<DNSRecord>& res, int& ret) const
 506 {
 507   bool variableAnswer = false;
 508   bool wantsRPZ = false;
 509   bool logQuery = false;
 510   RecursorLua4::DNSQuestion dq(ns, requestor, query, qtype.getCode(), isTcp, variableAnswer, wantsRPZ, logQuery);
 511   dq.currentRecords = &res;
 512
 513   return genhook(d_preoutquery, dq, ret);
 514 }
 515
 516 bool RecursorLua4::ipfilter(const ComboAddress& remote, const ComboAddress& local, const struct dnsheader& dh) const
 517 {
 518   if(d_ipfilter)
 519     return d_ipfilter(remote, local, dh);
 520   return false; // don't block
 521 }
 522
 523 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
 524 {
 525   if(d_gettag) {
 526     auto ret = d_gettag(remote, ednssubnet, local, qname, qtype, ednsOptions, tcp);
 527
 528     if (policyTags) {
 529       const auto& tags = std::get<1>(ret);
 530       if (tags) {
 531         for (const auto& tag : *tags) {
 532           policyTags->push_back(tag.second);
 533         }
 534       }
 535     }
 536     const auto dataret = std::get<2>(ret);
 537     if (dataret) {
 538       data = *dataret;
 539     }
 540     const auto reqIdret = std::get<3>(ret);
 541     if (reqIdret) {
 542       requestorId = *reqIdret;
 543     }
 544     const auto deviceIdret = std::get<4>(ret);
 545     if (deviceIdret) {
 546       deviceId = *deviceIdret;
 547     }
 548
 549     const auto deviceNameret = std::get<5>(ret);
 550     if (deviceNameret) {
 551       deviceName = *deviceNameret;
 552     }
 553     return std::get<0>(ret);
 554   }
 555   return 0;
 556 }
 557
 558 struct pdns_ffi_param
 559 {
 560 public:
 561   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_)
 562   {
 563   }
 564
 565   std::unique_ptr<std::string> qnameStr{nullptr};
 566   std::unique_ptr<std::string> localStr{nullptr};
 567   std::unique_ptr<std::string> remoteStr{nullptr};
 568   std::unique_ptr<std::string> ednssubnetStr{nullptr};
 569   std::vector<pdns_ednsoption_t> ednsOptionsVect;
 570
 571   const DNSName& qname;
 572   const ComboAddress& local;
 573   const ComboAddress& remote;
 574   const Netmask& ednssubnet;
 575   std::vector<std::string>& policyTags;
 576   std::vector<DNSRecord>& records;
 577   const EDNSOptionViewMap& ednsOptions;
 578   std::string& requestorId;
 579   std::string& deviceId;
 580   std::string& deviceName;
 581   boost::optional<int>& rcode;
 582   uint32_t& ttlCap;
 583   bool& variable;
 584   bool& logQuery;
 585   bool& logResponse;
 586   bool& followCNAMERecords;
 587
 588   unsigned int tag{0};
 589   uint16_t qtype;
 590   bool tcp;
 591 };
 592
 593 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
 594 {
 595   if (d_gettag_ffi) {
 596     pdns_ffi_param_t param(qname, qtype, local, remote, ednssubnet, *policyTags, records, ednsOptions, requestorId, deviceId, deviceName, rcode, ttlCap, variable, tcp, logQuery, logResponse, followCNAMERecords);
 597
 598     auto ret = d_gettag_ffi(&param);
 599     if (ret) {
 600       data = *ret;
 601     }
 602
 603     return param.tag;
 604   }
 605   return 0;
 606 }
 607
 608 bool RecursorLua4::genhook(const luacall_t& func, DNSQuestion& dq, int& ret) const
 609 {
 610   if(!func)
 611     return false;
 612
 613   if (dq.currentRecords) {
 614     dq.records = *dq.currentRecords;
 615   } else {
 616     dq.records.clear();
 617   }
 618
 619   dq.followupFunction.clear();
 620   dq.followupPrefix.clear();
 621   dq.followupName.clear();
 622   dq.udpQuery.clear();
 623   dq.udpAnswer.clear();
 624   dq.udpCallback.clear();
 625
 626   dq.rcode = ret;
 627   bool handled=func(&dq);
 628
 629   if(handled) {
 630 loop:;
 631     ret=dq.rcode;
 632
 633     if(!dq.followupFunction.empty()) {
 634       if(dq.followupFunction=="followCNAMERecords") {
 635         ret = followCNAMERecords(dq.records, QType(dq.qtype));
 636       }
 637       else if(dq.followupFunction=="getFakeAAAARecords") {
 638         ret=getFakeAAAARecords(dq.followupName, dq.followupPrefix, dq.records);
 639       }
 640       else if(dq.followupFunction=="getFakePTRRecords") {
 641         ret=getFakePTRRecords(dq.followupName, dq.followupPrefix, dq.records);
 642       }
 643       else if(dq.followupFunction=="udpQueryResponse") {
 644         dq.udpAnswer = GenUDPQueryResponse(dq.udpQueryDest, dq.udpQuery);
 645         auto cbFunc = d_lw->readVariable<boost::optional<luacall_t>>(dq.udpCallback).get_value_or(0);
 646         if(!cbFunc) {
 647           g_log<<Logger::Error<<"Attempted callback for Lua UDP Query/Response which could not be found"<<endl;
 648           return false;
 649         }
 650         bool result=cbFunc(&dq);
 651         if(!result) {
 652           return false;
 653         }
 654         goto loop;
 655       }
 656     }
 657     if (dq.currentRecords) {
 658       *dq.currentRecords = dq.records;
 659     }
 660   }
 661
 662   // see if they added followup work for us too
 663   return handled;
 664 }
 665
 666 RecursorLua4::~RecursorLua4(){}
 667
 668 const char* pdns_ffi_param_get_qname(pdns_ffi_param_t* ref)
 669 {
 670   if (!ref->qnameStr) {
 671     ref->qnameStr = std::unique_ptr<std::string>(new std::string(ref->qname.toStringNoDot()));
 672   }
 673
 674   return ref->qnameStr->c_str();
 675 }
 676
 677 void pdns_ffi_param_get_qname_raw(pdns_ffi_param_t* ref, const char** qname, size_t* qnameSize)
 678 {
 679   const auto& storage = ref->qname.getStorage();
 680   *qname = storage.data();
 681   *qnameSize = storage.size();
 682 }
 683
 684 uint16_t pdns_ffi_param_get_qtype(const pdns_ffi_param_t* ref)
 685 {
 686   return ref->qtype;
 687 }
 688
 689 const char* pdns_ffi_param_get_remote(pdns_ffi_param_t* ref)
 690 {
 691   if (!ref->remoteStr) {
 692     ref->remoteStr = std::unique_ptr<std::string>(new std::string(ref->remote.toString()));
 693   }
 694
 695   return ref->remoteStr->c_str();
 696 }
 697
 698 static void pdns_ffi_comboaddress_to_raw(const ComboAddress& ca, const void** addr, size_t* addrSize)
 699 {
 700   if (ca.isIPv4()) {
 701     *addr = &ca.sin4.sin_addr.s_addr;
 702     *addrSize = sizeof(ca.sin4.sin_addr.s_addr);
 703   }
 704   else {
 705     *addr = &ca.sin6.sin6_addr.s6_addr;
 706     *addrSize = sizeof(ca.sin6.sin6_addr.s6_addr);
 707   }
 708 }
 709
 710 void pdns_ffi_param_get_remote_raw(pdns_ffi_param_t* ref, const void** addr, size_t* addrSize)
 711 {
 712   pdns_ffi_comboaddress_to_raw(ref->remote, addr, addrSize);
 713 }
 714
 715 uint16_t pdns_ffi_param_get_remote_port(const pdns_ffi_param_t* ref)
 716 {
 717   return ref->remote.getPort();
 718 }
 719
 720 const char* pdns_ffi_param_get_local(pdns_ffi_param_t* ref)
 721 {
 722   if (!ref->localStr) {
 723     ref->localStr = std::unique_ptr<std::string>(new std::string(ref->local.toString()));
 724   }
 725
 726   return ref->localStr->c_str();
 727 }
 728
 729 void pdns_ffi_param_get_local_raw(pdns_ffi_param_t* ref, const void** addr, size_t* addrSize)
 730 {
 731   pdns_ffi_comboaddress_to_raw(ref->local, addr, addrSize);
 732 }
 733
 734 uint16_t pdns_ffi_param_get_local_port(const pdns_ffi_param_t* ref)
 735 {
 736   return ref->local.getPort();
 737 }
 738
 739 const char* pdns_ffi_param_get_edns_cs(pdns_ffi_param_t* ref)
 740 {
 741   if (ref->ednssubnet.empty()) {
 742     return nullptr;
 743   }
 744
 745   if (!ref->ednssubnetStr) {
 746     ref->ednssubnetStr = std::unique_ptr<std::string>(new std::string(ref->ednssubnet.toStringNoMask()));
 747   }
 748
 749   return ref->ednssubnetStr->c_str();
 750 }
 751
 752 void pdns_ffi_param_get_edns_cs_raw(pdns_ffi_param_t* ref, const void** net, size_t* netSize)
 753 {
 754   if (ref->ednssubnet.empty()) {
 755     *net = nullptr;
 756     *netSize = 0;
 757     return;
 758   }
 759
 760   pdns_ffi_comboaddress_to_raw(ref->ednssubnet.getNetwork(), net, netSize);
 761 }
 762
 763 uint8_t pdns_ffi_param_get_edns_cs_source_mask(const pdns_ffi_param_t* ref)
 764 {
 765   return ref->ednssubnet.getBits();
 766 }
 767
 768 static void fill_edns_option(const EDNSOptionViewValue& value, pdns_ednsoption_t& option)
 769 {
 770   option.len = value.size;
 771   option.data = nullptr;
 772
 773   if (value.size > 0) {
 774     option.data = value.content;
 775   }
 776 }
 777
 778 size_t pdns_ffi_param_get_edns_options(pdns_ffi_param_t* ref, const pdns_ednsoption_t** out)
 779 {
 780   if (ref->ednsOptions.empty()) {
 781     return 0;
 782   }
 783
 784   size_t totalCount = 0;
 785   for (const auto& option : ref->ednsOptions) {
 786     totalCount += option.second.values.size();
 787   }
 788
 789   ref->ednsOptionsVect.resize(totalCount);
 790
 791   size_t pos = 0;
 792   for (const auto& option : ref->ednsOptions) {
 793     for (const auto& entry : option.second.values) {
 794       fill_edns_option(entry, ref->ednsOptionsVect.at(pos));
 795       ref->ednsOptionsVect.at(pos).optionCode = option.first;
 796       pos++;
 797     }
 798   }
 799
 800   *out = ref->ednsOptionsVect.data();
 801
 802   return totalCount;
 803 }
 804
 805 size_t pdns_ffi_param_get_edns_options_by_code(pdns_ffi_param_t* ref, uint16_t optionCode, const pdns_ednsoption_t** out)
 806 {
 807   const auto& it = ref->ednsOptions.find(optionCode);
 808   if (it == ref->ednsOptions.cend() || it->second.values.empty()) {
 809     return 0;
 810   }
 811
 812   ref->ednsOptionsVect.resize(it->second.values.size());
 813
 814   size_t pos = 0;
 815   for (const auto& entry : it->second.values) {
 816     fill_edns_option(entry, ref->ednsOptionsVect.at(pos));
 817     ref->ednsOptionsVect.at(pos).optionCode = optionCode;
 818     pos++;
 819   }
 820
 821   *out = ref->ednsOptionsVect.data();
 822
 823   return pos;
 824 }
 825
 826 void pdns_ffi_param_set_tag(pdns_ffi_param_t* ref, unsigned int tag)
 827 {
 828   ref->tag = tag;
 829 }
 830
 831 void pdns_ffi_param_add_policytag(pdns_ffi_param_t *ref, const char* name)
 832 {
 833   ref->policyTags.push_back(std::string(name));
 834 }
 835
 836 void pdns_ffi_param_set_requestorid(pdns_ffi_param_t* ref, const char* name)
 837 {
 838   ref->requestorId = std::string(name);
 839 }
 840
 841 void pdns_ffi_param_set_devicename(pdns_ffi_param_t* ref, const char* name)
 842 {
 843   ref->deviceName = std::string(name);
 844 }
 845
 846 void pdns_ffi_param_set_deviceid(pdns_ffi_param_t* ref, size_t len, const void* name)
 847 {
 848   ref->deviceId = std::string(reinterpret_cast<const char*>(name), len);
 849 }
 850
 851 void pdns_ffi_param_set_variable(pdns_ffi_param_t* ref, bool variable)
 852 {
 853   ref->variable = variable;
 854 }
 855
 856 void pdns_ffi_param_set_ttl_cap(pdns_ffi_param_t* ref, uint32_t ttl)
 857 {
 858   ref->ttlCap = ttl;
 859 }
 860
 861 void pdns_ffi_param_set_log_query(pdns_ffi_param_t* ref, bool logQuery)
 862 {
 863   ref->logQuery = logQuery;
 864 }
 865
 866 void pdns_ffi_param_set_log_response(pdns_ffi_param_t* ref, bool logResponse)
 867 {
 868   ref->logResponse = logResponse;
 869 }
 870
 871 void pdns_ffi_param_set_rcode(pdns_ffi_param_t* ref, int rcode)
 872 {
 873   ref->rcode = rcode;
 874 }
 875
 876 void pdns_ffi_param_set_follow_cname_records(pdns_ffi_param_t* ref, bool follow)
 877 {
 878   ref->followCNAMERecords = follow;
 879 }
 880
 881 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)
 882 {
 883   try {
 884     DNSRecord dr;
 885     dr.d_name = name != nullptr ? DNSName(name) : ref->qname;
 886     dr.d_ttl = ttl;
 887     dr.d_type = type;
 888     dr.d_class = QClass::IN;
 889     dr.d_place = DNSResourceRecord::Place(place);
 890     dr.d_content = DNSRecordContent::mastermake(type, QClass::IN, std::string(content, contentSize));
 891     ref->records.push_back(std::move(dr));
 892
 893     return true;
 894   }
 895   catch (const std::exception& e) {
 896     g_log<<Logger::Error<<"Error attempting to add a record from Lua via pdns_ffi_param_add_record(): "<<e.what()<<endl;
 897     return false;
 898   }
 899 }