pdns/lua-recursor4.cc

   1 /*
   2  * This file is part of PowerDNS or dnsdist.
   3  * Copyright -- PowerDNS.COM B.V. and its contributors
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * In addition, for the avoidance of any doubt, permission is granted to
  10  * link this program with OpenSSL and to (re)distribute the binaries
  11  * produced as the result of such linking.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  */
  22 #include "lua-recursor4.hh"
  23 #include <fstream>
  24 #include "logger.hh"
  25 #include "dnsparser.hh"
  26 #include "syncres.hh"
  27 #include "namespaces.hh"
  28 #include "rec_channel.hh"
  29 #include "ednsoptions.hh"
  30 #include "ednssubnet.hh"
  31 #include "filterpo.hh"
  32 #include "rec-snmp.hh"
  33 #include <unordered_set>
  34
  35 RecursorLua4::RecursorLua4() { prepareContext(); }
  36
  37 static int followCNAMERecords(vector<DNSRecord>& ret, const QType& qtype)
  38 {
  39   vector<DNSRecord> resolved;
  40   DNSName target;
  41   for(const DNSRecord& rr :  ret) {
  42     if(rr.d_type == QType::CNAME) {
  43       auto rec = getRR<CNAMERecordContent>(rr);
  44       if(rec) {
  45         target=rec->getTarget();
  46         break;
  47       }
  48     }
  49   }
  50   if(target.empty())
  51     return 0;
  52
  53   int rcode=directResolve(target, qtype, 1, resolved); // 1 == class
  54
  55   for(const DNSRecord& rr :  resolved) {
  56     ret.push_back(rr);
  57   }
  58   return rcode;
  59
  60 }
  61
  62 static int getFakeAAAARecords(const DNSName& qname, const std::string& prefix, vector<DNSRecord>& ret)
  63 {
  64   int rcode=directResolve(qname, QType(QType::A), 1, ret);
  65
  66   ComboAddress prefixAddress(prefix);
  67
  68   for(DNSRecord& rr :  ret)
  69   {
  70     if(rr.d_type == QType::A && rr.d_place==DNSResourceRecord::ANSWER) {
  71       if(auto rec = getRR<ARecordContent>(rr)) {
  72         ComboAddress ipv4(rec->getCA());
  73         uint32_t tmp;
  74         memcpy((void*)&tmp, &ipv4.sin4.sin_addr.s_addr, 4);
  75         // tmp=htonl(tmp);
  76         memcpy(((char*)&prefixAddress.sin6.sin6_addr.s6_addr)+12, &tmp, 4);
  77         rr.d_content = std::make_shared<AAAARecordContent>(prefixAddress);
  78         rr.d_type = QType::AAAA;
  79       }
  80     }
  81   }
  82   return rcode;
  83 }
  84
  85 static int getFakePTRRecords(const DNSName& qname, const std::string& prefix, vector<DNSRecord>& ret)
  86 {
  87   /* qname has a reverse ordered IPv6 address, need to extract the underlying IPv4 address from it
  88      and turn it into an IPv4 in-addr.arpa query */
  89   ret.clear();
  90   vector<string> parts = qname.getRawLabels();
  91
  92   if(parts.size() < 8)
  93     return -1;
  94
  95   string newquery;
  96   for(int n = 0; n < 4; ++n) {
  97     newquery +=
  98       std::to_string(stoll(parts[n*2], 0, 16) + 16*stoll(parts[n*2+1], 0, 16));
  99     newquery.append(1,'.');
 100   }
 101   newquery += "in-addr.arpa.";
 102
 103
 104   int rcode = directResolve(DNSName(newquery), QType(QType::PTR), 1, ret);
 105   for(DNSRecord& rr :  ret)
 106   {
 107     if(rr.d_type == QType::PTR && rr.d_place==DNSResourceRecord::ANSWER) {
 108       rr.d_name = qname;
 109     }
 110   }
 111   return rcode;
 112
 113 }
 114
 115 boost::optional<dnsheader> RecursorLua4::DNSQuestion::getDH() const
 116 {
 117   if (dh)
 118     return *dh;
 119   return boost::optional<dnsheader>();
 120 }
 121
 122 vector<string> RecursorLua4::DNSQuestion::getEDNSFlags() const
 123 {
 124   vector<string> ret;
 125   if (ednsFlags) {
 126     if (*ednsFlags & EDNSOpts::DNSSECOK)
 127       ret.push_back("DO");
 128   }
 129   return ret;
 130 }
 131
 132 bool RecursorLua4::DNSQuestion::getEDNSFlag(string flag) const
 133 {
 134   if (ednsFlags) {
 135     if (flag == "DO" && (*ednsFlags & EDNSOpts::DNSSECOK))
 136       return true;
 137   }
 138   return false;
 139 }
 140
 141 vector<pair<uint16_t, string> > RecursorLua4::DNSQuestion::getEDNSOptions() const
 142 {
 143   if(ednsOptions)
 144     return *ednsOptions;
 145   else
 146     return vector<pair<uint16_t,string>>();
 147 }
 148
 149 boost::optional<string>  RecursorLua4::DNSQuestion::getEDNSOption(uint16_t code) const
 150 {
 151   if(ednsOptions)
 152     for(const auto& o : *ednsOptions)
 153       if(o.first==code)
 154         return o.second;
 155
 156   return boost::optional<string>();
 157 }
 158
 159 boost::optional<Netmask>  RecursorLua4::DNSQuestion::getEDNSSubnet() const
 160 {
 161   if(ednsOptions) {
 162     for(const auto& o : *ednsOptions) {
 163       if(o.first==EDNSOptionCode::ECS) {
 164         EDNSSubnetOpts eso;
 165         if(getEDNSSubnetOptsFromString(o.second, &eso))
 166           return eso.source;
 167         else
 168           break;
 169       }
 170     }
 171   }
 172   return boost::optional<Netmask>();
 173 }
 174
 175
 176 vector<pair<int, DNSRecord> > RecursorLua4::DNSQuestion::getRecords() const
 177 {
 178   vector<pair<int, DNSRecord> > ret;
 179   int num=1;
 180   for(const auto& r : records) {
 181     ret.push_back({num++, r});
 182   }
 183   return ret;
 184 }
 185 void RecursorLua4::DNSQuestion::setRecords(const vector<pair<int, DNSRecord> >& recs)
 186 {
 187   records.clear();
 188   for(const auto& p : recs) {
 189     records.push_back(p.second);
 190   }
 191 }
 192
 193 void RecursorLua4::DNSQuestion::addRecord(uint16_t type, const std::string& content, DNSResourceRecord::Place place, boost::optional<int> ttl, boost::optional<string> name)
 194 {
 195   DNSRecord dr;
 196   dr.d_name=name ? DNSName(*name) : qname;
 197   dr.d_ttl=ttl.get_value_or(3600);
 198   dr.d_type = type;
 199   dr.d_place = place;
 200   dr.d_content = DNSRecordContent::mastermake(type, 1, content);
 201   records.push_back(dr);
 202 }
 203
 204 void RecursorLua4::DNSQuestion::addAnswer(uint16_t type, const std::string& content, boost::optional<int> ttl, boost::optional<string> name)
 205 {
 206   addRecord(type, content, DNSResourceRecord::ANSWER, ttl, name);
 207 }
 208
 209 struct DynMetric
 210 {
 211   std::atomic<unsigned long>* ptr;
 212   void inc() { (*ptr)++; }
 213   void incBy(unsigned int by) { (*ptr)+= by; }
 214   unsigned long get() { return *ptr; }
 215   void set(unsigned long val) { *ptr =val; }
 216 };
 217
 218 void RecursorLua4::postPrepareContext()
 219 {
 220   d_lw->registerMember<const DNSName (DNSQuestion::*)>("qname", [](const DNSQuestion& dq) -> const DNSName& { return dq.qname; }, [](DNSQuestion& dq, const DNSName& newName) { (void) newName; });
 221   d_lw->registerMember<uint16_t (DNSQuestion::*)>("qtype", [](const DNSQuestion& dq) -> uint16_t { return dq.qtype; }, [](DNSQuestion& dq, uint16_t newType) { (void) newType; });
 222   d_lw->registerMember<bool (DNSQuestion::*)>("isTcp", [](const DNSQuestion& dq) -> bool { return dq.isTcp; }, [](DNSQuestion& dq, bool newTcp) { (void) newTcp; });
 223   d_lw->registerMember<const ComboAddress (DNSQuestion::*)>("localaddr", [](const DNSQuestion& dq) -> const ComboAddress& { return dq.local; }, [](DNSQuestion& dq, const ComboAddress& newLocal) { (void) newLocal; });
 224   d_lw->registerMember<const ComboAddress (DNSQuestion::*)>("remoteaddr", [](const DNSQuestion& dq) -> const ComboAddress& { return dq.remote; }, [](DNSQuestion& dq, const ComboAddress& newRemote) { (void) newRemote; });
 225   d_lw->registerMember<vState (DNSQuestion::*)>("validationState", [](const DNSQuestion& dq) -> vState { return dq.validationState; }, [](DNSQuestion& dq, vState newState) { (void) newState; });
 226
 227   d_lw->registerMember<bool (DNSQuestion::*)>("variable", [](const DNSQuestion& dq) -> bool { return dq.variable; }, [](DNSQuestion& dq, bool newVariable) { dq.variable = newVariable; });
 228   d_lw->registerMember<bool (DNSQuestion::*)>("wantsRPZ", [](const DNSQuestion& dq) -> bool { return dq.wantsRPZ; }, [](DNSQuestion& dq, bool newWantsRPZ) { dq.wantsRPZ = newWantsRPZ; });
 229
 230   d_lw->registerMember("rcode", &DNSQuestion::rcode);
 231   d_lw->registerMember("tag", &DNSQuestion::tag);
 232   d_lw->registerMember("requestorId", &DNSQuestion::requestorId);
 233   d_lw->registerMember("followupFunction", &DNSQuestion::followupFunction);
 234   d_lw->registerMember("followupPrefix", &DNSQuestion::followupPrefix);
 235   d_lw->registerMember("followupName", &DNSQuestion::followupName);
 236   d_lw->registerMember("data", &DNSQuestion::data);
 237   d_lw->registerMember("udpQuery", &DNSQuestion::udpQuery);
 238   d_lw->registerMember("udpAnswer", &DNSQuestion::udpAnswer);
 239   d_lw->registerMember("udpQueryDest", &DNSQuestion::udpQueryDest);
 240   d_lw->registerMember("udpCallback", &DNSQuestion::udpCallback);
 241   d_lw->registerMember("appliedPolicy", &DNSQuestion::appliedPolicy);
 242   d_lw->registerMember<DNSFilterEngine::Policy, std::string>("policyName",
 243     [](const DNSFilterEngine::Policy& pol) -> std::string {
 244       if(pol.d_name)
 245         return *pol.d_name;
 246       return std::string();
 247     },
 248     [](DNSFilterEngine::Policy& pol, const std::string& name) {
 249       pol.d_name = std::make_shared<std::string>(name);
 250     });
 251   d_lw->registerMember("policyKind", &DNSFilterEngine::Policy::d_kind);
 252   d_lw->registerMember("policyTTL", &DNSFilterEngine::Policy::d_ttl);
 253   d_lw->registerMember<DNSFilterEngine::Policy, std::string>("policyCustom",
 254     [](const DNSFilterEngine::Policy& pol) -> std::string {
 255       if(pol.d_custom)
 256         return pol.d_custom->getZoneRepresentation();
 257       return std::string();
 258     },
 259     [](DNSFilterEngine::Policy& pol, const std::string& content) {
 260       // Only CNAMES for now, when we ever add a d_custom_type, there will be pain
 261       pol.d_custom = DNSRecordContent::mastermake(QType::CNAME, 1, content);
 262     }
 263   );
 264   d_lw->registerFunction("getDH", &DNSQuestion::getDH);
 265   d_lw->registerFunction("getEDNSOptions", &DNSQuestion::getEDNSOptions);
 266   d_lw->registerFunction("getEDNSOption", &DNSQuestion::getEDNSOption);
 267   d_lw->registerFunction("getEDNSSubnet", &DNSQuestion::getEDNSSubnet);
 268   d_lw->registerFunction("getEDNSFlags", &DNSQuestion::getEDNSFlags);
 269   d_lw->registerFunction("getEDNSFlag", &DNSQuestion::getEDNSFlag);
 270   d_lw->registerMember("name", &DNSRecord::d_name);
 271   d_lw->registerMember("type", &DNSRecord::d_type);
 272   d_lw->registerMember("ttl", &DNSRecord::d_ttl);
 273   d_lw->registerMember("place", &DNSRecord::d_place);
 274
 275   d_lw->registerMember("size", &EDNSOptionViewValue::size);
 276   d_lw->registerFunction<std::string(EDNSOptionViewValue::*)()>("getContent", [](const EDNSOptionViewValue& value) { return std::string(value.content, value.size); });
 277   d_lw->registerFunction<size_t(EDNSOptionView::*)()>("count", [](const EDNSOptionView& option) { return option.values.size(); });
 278   d_lw->registerFunction<std::vector<std::pair<int, string>>(EDNSOptionView::*)()>("getValues", [] (const EDNSOptionView& option) {
 279       std::vector<std::pair<int, string> > values;
 280       for (const auto& value : option.values) {
 281         values.push_back(std::make_pair(values.size(), std::string(value.content, value.size)));
 282       }
 283       return values;
 284     });
 285
 286   /* pre 4.2 API compatibility, when we had only one value for a given EDNS option */
 287   d_lw->registerMember<uint16_t(EDNSOptionView::*)>("size", [](const EDNSOptionView& option) -> uint16_t {
 288       uint16_t result = 0;
 289
 290       if (!option.values.empty()) {
 291         result = option.values.at(0).size;
 292       }
 293       return result;
 294     },
 295     [](EDNSOptionView& option, uint16_t newSize) { (void) newSize; });
 296   d_lw->registerFunction<std::string(EDNSOptionView::*)()>("getContent", [](const EDNSOptionView& option) {
 297       if (option.values.empty()) {
 298         return std::string();
 299       }
 300       return std::string(option.values.at(0).content, option.values.at(0).size); });
 301
 302   d_lw->registerFunction<string(DNSRecord::*)()>("getContent", [](const DNSRecord& dr) { return dr.d_content->getZoneRepresentation(); });
 303   d_lw->registerFunction<boost::optional<ComboAddress>(DNSRecord::*)()>("getCA", [](const DNSRecord& dr) {
 304       boost::optional<ComboAddress> ret;
 305
 306       if(auto rec = std::dynamic_pointer_cast<ARecordContent>(dr.d_content))
 307         ret=rec->getCA(53);
 308       else if(auto aaaarec = std::dynamic_pointer_cast<AAAARecordContent>(dr.d_content))
 309         ret=aaaarec->getCA(53);
 310       return ret;
 311     });
 312
 313
 314   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); });
 315   d_lw->registerFunction("addAnswer", &DNSQuestion::addAnswer);
 316   d_lw->registerFunction("addRecord", &DNSQuestion::addRecord);
 317   d_lw->registerFunction("getRecords", &DNSQuestion::getRecords);
 318   d_lw->registerFunction("setRecords", &DNSQuestion::setRecords);
 319
 320   d_lw->registerFunction<void(DNSQuestion::*)(const std::string&)>("addPolicyTag", [](DNSQuestion& dq, const std::string& tag) { if (dq.policyTags) { dq.policyTags->push_back(tag); } });
 321   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) {
 322       if (dq.policyTags) {
 323         dq.policyTags->clear();
 324         for (const auto& tag : tags) {
 325           dq.policyTags->push_back(tag.second);
 326         }
 327       }
 328     });
 329   d_lw->registerFunction<std::vector<std::pair<int, std::string> >(DNSQuestion::*)()>("getPolicyTags", [](const DNSQuestion& dq) {
 330       std::vector<std::pair<int, std::string> > ret;
 331       if (dq.policyTags) {
 332         int count = 1;
 333         for (const auto& tag : *dq.policyTags) {
 334           ret.push_back({count++, tag});
 335         }
 336       }
 337       return ret;
 338     });
 339
 340   d_lw->registerFunction<void(DNSQuestion::*)(const std::string&)>("discardPolicy", [](DNSQuestion& dq, const std::string& policy) {
 341       if (dq.discardedPolicies) {
 342         (*dq.discardedPolicies)[policy] = true;
 343       }
 344     });
 345
 346   d_lw->writeFunction("newDS", []() { return SuffixMatchNode(); });
 347   d_lw->registerFunction<void(SuffixMatchNode::*)(boost::variant<string,DNSName, vector<pair<unsigned int,string> > >)>(
 348     "add",
 349     [](SuffixMatchNode&smn, const boost::variant<string,DNSName,vector<pair<unsigned int,string> > >& in){
 350       try {
 351         if(auto s = boost::get<string>(&in)) {
 352           smn.add(DNSName(*s));
 353         }
 354         else if(auto v = boost::get<vector<pair<unsigned int, string> > >(&in)) {
 355           for(const auto& entry : *v)
 356             smn.add(DNSName(entry.second));
 357         }
 358         else {
 359           smn.add(boost::get<DNSName>(in));
 360         }
 361       }
 362       catch(std::exception& e) {
 363         g_log <<Logger::Error<<e.what()<<endl;
 364       }
 365     }
 366   );
 367
 368   d_lw->registerFunction("check",(bool (SuffixMatchNode::*)(const DNSName&) const) &SuffixMatchNode::check);
 369   d_lw->registerFunction("toString",(string (SuffixMatchNode::*)() const) &SuffixMatchNode::toString);
 370
 371   d_pd.push_back({"policykinds", in_t {
 372     {"NoAction", (int)DNSFilterEngine::PolicyKind::NoAction},
 373     {"Drop",     (int)DNSFilterEngine::PolicyKind::Drop    },
 374     {"NXDOMAIN", (int)DNSFilterEngine::PolicyKind::NXDOMAIN},
 375     {"NODATA",   (int)DNSFilterEngine::PolicyKind::NODATA  },
 376     {"Truncate", (int)DNSFilterEngine::PolicyKind::Truncate},
 377     {"Custom",   (int)DNSFilterEngine::PolicyKind::Custom  }
 378     }});
 379
 380   for(const auto& n : QType::names)
 381     d_pd.push_back({n.first, n.second});
 382
 383   d_pd.push_back({"validationstates", in_t{
 384         {"Indeterminate", Indeterminate },
 385         {"Bogus", Bogus },
 386         {"Insecure", Insecure },
 387         {"Secure", Secure },
 388   }});
 389
 390   d_pd.push_back({"now", &g_now});
 391
 392   d_lw->writeFunction("getMetric", [](const std::string& str) {
 393       return DynMetric{getDynMetric(str)};
 394     });
 395
 396   d_lw->registerFunction("inc", &DynMetric::inc);
 397   d_lw->registerFunction("incBy", &DynMetric::incBy);
 398   d_lw->registerFunction("set", &DynMetric::set);
 399   d_lw->registerFunction("get", &DynMetric::get);
 400
 401   d_lw->writeFunction("getStat", [](const std::string& str) {
 402       uint64_t result = 0;
 403       optional<uint64_t> value = getStatByName(str);
 404       if (value) {
 405         result = *value;
 406       }
 407       return result;
 408     });
 409
 410   d_lw->writeFunction("getRecursorThreadId", []() {
 411       return getRecursorThreadId();
 412     });
 413
 414   d_lw->writeFunction("sendCustomSNMPTrap", [](const std::string& str) {
 415       if (g_snmpAgent) {
 416         g_snmpAgent->sendCustomTrap(str);
 417       }
 418     });
 419 }
 420
 421 void RecursorLua4::postLoad() {
 422   d_prerpz = d_lw->readVariable<boost::optional<luacall_t>>("prerpz").get_value_or(0);
 423   d_preresolve = d_lw->readVariable<boost::optional<luacall_t>>("preresolve").get_value_or(0);
 424   d_nodata = d_lw->readVariable<boost::optional<luacall_t>>("nodata").get_value_or(0);
 425   d_nxdomain = d_lw->readVariable<boost::optional<luacall_t>>("nxdomain").get_value_or(0);
 426   d_postresolve = d_lw->readVariable<boost::optional<luacall_t>>("postresolve").get_value_or(0);
 427   d_preoutquery = d_lw->readVariable<boost::optional<luacall_t>>("preoutquery").get_value_or(0);
 428   d_maintenance = d_lw->readVariable<boost::optional<luamaintenance_t>>("maintenance").get_value_or(0);
 429
 430   d_ipfilter = d_lw->readVariable<boost::optional<ipfilter_t>>("ipfilter").get_value_or(0);
 431   d_gettag = d_lw->readVariable<boost::optional<gettag_t>>("gettag").get_value_or(0);
 432   d_gettag_ffi = d_lw->readVariable<boost::optional<gettag_ffi_t>>("gettag_ffi").get_value_or(0);
 433 }
 434
 435 void RecursorLua4::maintenance() const
 436 {
 437   if (d_maintenance) {
 438     d_maintenance();
 439   }
 440 }
 441
 442 bool RecursorLua4::prerpz(DNSQuestion& dq, int& ret) const
 443 {
 444   return genhook(d_prerpz, dq, ret);
 445 }
 446
 447 bool RecursorLua4::preresolve(DNSQuestion& dq, int& ret) const
 448 {
 449   return genhook(d_preresolve, dq, ret);
 450 }
 451
 452 bool RecursorLua4::nxdomain(DNSQuestion& dq, int& ret) const
 453 {
 454   return genhook(d_nxdomain, dq, ret);
 455 }
 456
 457 bool RecursorLua4::nodata(DNSQuestion& dq, int& ret) const
 458 {
 459   return genhook(d_nodata, dq, ret);
 460 }
 461
 462 bool RecursorLua4::postresolve(DNSQuestion& dq, int& ret) const
 463 {
 464   return genhook(d_postresolve, dq, ret);
 465 }
 466
 467 bool RecursorLua4::preoutquery(const ComboAddress& ns, const ComboAddress& requestor, const DNSName& query, const QType& qtype, bool isTcp, vector<DNSRecord>& res, int& ret) const
 468 {
 469   bool variableAnswer = false;
 470   bool wantsRPZ = false;
 471   RecursorLua4::DNSQuestion dq(ns, requestor, query, qtype.getCode(), isTcp, variableAnswer, wantsRPZ);
 472   dq.currentRecords = &res;
 473
 474   return genhook(d_preoutquery, dq, ret);
 475 }
 476
 477 bool RecursorLua4::ipfilter(const ComboAddress& remote, const ComboAddress& local, const struct dnsheader& dh) const
 478 {
 479   if(d_ipfilter)
 480     return d_ipfilter(remote, local, dh);
 481   return false; // don't block
 482 }
 483
 484 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
 485 {
 486   if(d_gettag) {
 487     auto ret = d_gettag(remote, ednssubnet, local, qname, qtype, ednsOptions, tcp);
 488
 489     if (policyTags) {
 490       const auto& tags = std::get<1>(ret);
 491       if (tags) {
 492         for (const auto& tag : *tags) {
 493           policyTags->push_back(tag.second);
 494         }
 495       }
 496     }
 497     const auto dataret = std::get<2>(ret);
 498     if (dataret) {
 499       data = *dataret;
 500     }
 501     const auto reqIdret = std::get<3>(ret);
 502     if (reqIdret) {
 503       requestorId = *reqIdret;
 504     }
 505     const auto deviceIdret = std::get<4>(ret);
 506     if (deviceIdret) {
 507       deviceId = *deviceIdret;
 508     }
 509     return std::get<0>(ret);
 510   }
 511   return 0;
 512 }
 513
 514 struct pdns_ffi_param
 515 {
 516 public:
 517   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_): qname(qname_), local(local_), remote(remote_), ednssubnet(ednssubnet_), policyTags(policyTags_), ednsOptions(ednsOptions_), requestorId(requestorId_), deviceId(deviceId_), ttlCap(ttlCap_), variable(variable_), qtype(qtype_), tcp(tcp_)
 518   {
 519   }
 520
 521   std::unique_ptr<std::string> qnameStr{nullptr};
 522   std::unique_ptr<std::string> localStr{nullptr};
 523   std::unique_ptr<std::string> remoteStr{nullptr};
 524   std::unique_ptr<std::string> ednssubnetStr{nullptr};
 525   std::vector<pdns_ednsoption_t> ednsOptionsVect;
 526
 527   const DNSName& qname;
 528   const ComboAddress& local;
 529   const ComboAddress& remote;
 530   const Netmask& ednssubnet;
 531   std::vector<std::string>& policyTags;
 532   const EDNSOptionViewMap& ednsOptions;
 533   std::string& requestorId;
 534   std::string& deviceId;
 535   uint32_t& ttlCap;
 536   bool& variable;
 537
 538   unsigned int tag{0};
 539   uint16_t qtype;
 540   bool tcp;
 541 };
 542
 543 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) const
 544 {
 545   if (d_gettag_ffi) {
 546     pdns_ffi_param_t param(qname, qtype, local, remote, ednssubnet, *policyTags, ednsOptions, requestorId, deviceId, ttlCap, variable, tcp);
 547
 548     auto ret = d_gettag_ffi(&param);
 549     if (ret) {
 550       data = *ret;
 551     }
 552
 553     return param.tag;
 554   }
 555   return 0;
 556 }
 557
 558 bool RecursorLua4::genhook(const luacall_t& func, DNSQuestion& dq, int& ret) const
 559 {
 560   if(!func)
 561     return false;
 562
 563   if (dq.currentRecords) {
 564     dq.records = *dq.currentRecords;
 565   } else {
 566     dq.records.clear();
 567   }
 568
 569   dq.followupFunction.clear();
 570   dq.followupPrefix.clear();
 571   dq.followupName.clear();
 572   dq.udpQuery.clear();
 573   dq.udpAnswer.clear();
 574   dq.udpCallback.clear();
 575
 576   dq.rcode = ret;
 577   bool handled=func(&dq);
 578
 579   if(handled) {
 580 loop:;
 581     ret=dq.rcode;
 582
 583     if(!dq.followupFunction.empty()) {
 584       if(dq.followupFunction=="followCNAMERecords") {
 585         ret = followCNAMERecords(dq.records, QType(dq.qtype));
 586       }
 587       else if(dq.followupFunction=="getFakeAAAARecords") {
 588         ret=getFakeAAAARecords(dq.followupName, dq.followupPrefix, dq.records);
 589       }
 590       else if(dq.followupFunction=="getFakePTRRecords") {
 591         ret=getFakePTRRecords(dq.followupName, dq.followupPrefix, dq.records);
 592       }
 593       else if(dq.followupFunction=="udpQueryResponse") {
 594         dq.udpAnswer = GenUDPQueryResponse(dq.udpQueryDest, dq.udpQuery);
 595         auto cbFunc = d_lw->readVariable<boost::optional<luacall_t>>(dq.udpCallback).get_value_or(0);
 596         if(!cbFunc) {
 597           g_log<<Logger::Error<<"Attempted callback for Lua UDP Query/Response which could not be found"<<endl;
 598           return false;
 599         }
 600         bool result=cbFunc(&dq);
 601         if(!result) {
 602           return false;
 603         }
 604         goto loop;
 605       }
 606     }
 607     if (dq.currentRecords) {
 608       *dq.currentRecords = dq.records;
 609     }
 610   }
 611
 612   // see if they added followup work for us too
 613   return handled;
 614 }
 615
 616 RecursorLua4::~RecursorLua4(){}
 617
 618 const char* pdns_ffi_param_get_qname(pdns_ffi_param_t* ref)
 619 {
 620   if (!ref->qnameStr) {
 621     ref->qnameStr = std::unique_ptr<std::string>(new std::string(ref->qname.toStringNoDot()));
 622   }
 623
 624   return ref->qnameStr->c_str();
 625 }
 626
 627 void pdns_ffi_param_get_qname_raw(pdns_ffi_param_t* ref, const char** qname, size_t* qnameSize)
 628 {
 629   const auto& storage = ref->qname.getStorage();
 630   *qname = storage.data();
 631   *qnameSize = storage.size();
 632 }
 633
 634 uint16_t pdns_ffi_param_get_qtype(const pdns_ffi_param_t* ref)
 635 {
 636   return ref->qtype;
 637 }
 638
 639 const char* pdns_ffi_param_get_remote(pdns_ffi_param_t* ref)
 640 {
 641   if (!ref->remoteStr) {
 642     ref->remoteStr = std::unique_ptr<std::string>(new std::string(ref->remote.toString()));
 643   }
 644
 645   return ref->remoteStr->c_str();
 646 }
 647
 648 static void pdns_ffi_comboaddress_to_raw(const ComboAddress& ca, const void** addr, size_t* addrSize)
 649 {
 650   if (ca.isIPv4()) {
 651     *addr = &ca.sin4.sin_addr.s_addr;
 652     *addrSize = sizeof(ca.sin4.sin_addr.s_addr);
 653   }
 654   else {
 655     *addr = &ca.sin6.sin6_addr.s6_addr;
 656     *addrSize = sizeof(ca.sin6.sin6_addr.s6_addr);
 657   }
 658 }
 659
 660 void pdns_ffi_param_get_remote_raw(pdns_ffi_param_t* ref, const void** addr, size_t* addrSize)
 661 {
 662   pdns_ffi_comboaddress_to_raw(ref->remote, addr, addrSize);
 663 }
 664
 665 uint16_t pdns_ffi_param_get_remote_port(const pdns_ffi_param_t* ref)
 666 {
 667   return ref->remote.getPort();
 668 }
 669
 670 const char* pdns_ffi_param_get_local(pdns_ffi_param_t* ref)
 671 {
 672   if (!ref->localStr) {
 673     ref->localStr = std::unique_ptr<std::string>(new std::string(ref->local.toString()));
 674   }
 675
 676   return ref->localStr->c_str();
 677 }
 678
 679 void pdns_ffi_param_get_local_raw(pdns_ffi_param_t* ref, const void** addr, size_t* addrSize)
 680 {
 681   pdns_ffi_comboaddress_to_raw(ref->local, addr, addrSize);
 682 }
 683
 684 uint16_t pdns_ffi_param_get_local_port(const pdns_ffi_param_t* ref)
 685 {
 686   return ref->local.getPort();
 687 }
 688
 689 const char* pdns_ffi_param_get_edns_cs(pdns_ffi_param_t* ref)
 690 {
 691   if (ref->ednssubnet.empty()) {
 692     return nullptr;
 693   }
 694
 695   if (!ref->ednssubnetStr) {
 696     ref->ednssubnetStr = std::unique_ptr<std::string>(new std::string(ref->ednssubnet.toStringNoMask()));
 697   }
 698
 699   return ref->ednssubnetStr->c_str();
 700 }
 701
 702 void pdns_ffi_param_get_edns_cs_raw(pdns_ffi_param_t* ref, const void** net, size_t* netSize)
 703 {
 704   if (ref->ednssubnet.empty()) {
 705     *net = nullptr;
 706     *netSize = 0;
 707     return;
 708   }
 709
 710   pdns_ffi_comboaddress_to_raw(ref->ednssubnet.getNetwork(), net, netSize);
 711 }
 712
 713 uint8_t pdns_ffi_param_get_edns_cs_source_mask(const pdns_ffi_param_t* ref)
 714 {
 715   return ref->ednssubnet.getBits();
 716 }
 717
 718 static void fill_edns_option(const EDNSOptionViewValue& value, pdns_ednsoption_t& option)
 719 {
 720   option.len = value.size;
 721   option.data = nullptr;
 722
 723   if (value.size > 0) {
 724     option.data = value.content;
 725   }
 726 }
 727
 728 size_t pdns_ffi_param_get_edns_options(pdns_ffi_param_t* ref, const pdns_ednsoption_t** out)
 729 {
 730   if (ref->ednsOptions.empty()) {
 731     return 0;
 732   }
 733
 734   size_t totalCount = 0;
 735   for (const auto& option : ref->ednsOptions) {
 736     totalCount += option.second.values.size();
 737   }
 738
 739   ref->ednsOptionsVect.resize(totalCount);
 740
 741   size_t pos = 0;
 742   for (const auto& option : ref->ednsOptions) {
 743     for (const auto& entry : option.second.values) {
 744       fill_edns_option(entry, ref->ednsOptionsVect.at(pos));
 745       ref->ednsOptionsVect.at(pos).optionCode = option.first;
 746       pos++;
 747     }
 748   }
 749
 750   *out = ref->ednsOptionsVect.data();
 751
 752   return totalCount;
 753 }
 754
 755 size_t pdns_ffi_param_get_edns_options_by_code(pdns_ffi_param_t* ref, uint16_t optionCode, const pdns_ednsoption_t** out)
 756 {
 757   const auto& it = ref->ednsOptions.find(optionCode);
 758   if (it == ref->ednsOptions.cend() || it->second.values.empty()) {
 759     return 0;
 760   }
 761
 762   ref->ednsOptionsVect.resize(it->second.values.size());
 763
 764   size_t pos = 0;
 765   for (const auto& entry : it->second.values) {
 766     fill_edns_option(entry, ref->ednsOptionsVect.at(pos));
 767     ref->ednsOptionsVect.at(pos).optionCode = optionCode;
 768     pos++;
 769   }
 770
 771   *out = ref->ednsOptionsVect.data();
 772
 773   return pos;
 774 }
 775
 776 void pdns_ffi_param_set_tag(pdns_ffi_param_t* ref, unsigned int tag)
 777 {
 778   ref->tag = tag;
 779 }
 780
 781 void pdns_ffi_param_add_policytag(pdns_ffi_param_t *ref, const char* name)
 782 {
 783   ref->policyTags.push_back(std::string(name));
 784 }
 785
 786 void pdns_ffi_param_set_requestorid(pdns_ffi_param_t* ref, const char* name)
 787 {
 788   ref->requestorId = std::string(name);
 789 }
 790
 791 void pdns_ffi_param_set_devicename(pdns_ffi_param_t* ref, const char* name)
 792 {
 793   ref->deviceId = std::string(name);
 794 }
 795
 796 void pdns_ffi_param_set_deviceid(pdns_ffi_param_t* ref, size_t len, const void* name)
 797 {
 798   ref->deviceId = std::string(reinterpret_cast<const char*>(name), len);
 799 }
 800
 801 void pdns_ffi_param_set_variable(pdns_ffi_param_t* ref, bool variable)
 802 {
 803   ref->variable = variable;
 804 }
 805
 806 void pdns_ffi_param_set_ttl_cap(pdns_ffi_param_t* ref, uint32_t ttl)
 807 {
 808   ref->ttlCap = ttl;
 809 }