modules/bindbackend/bindbackend2.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
  23 #ifdef HAVE_CONFIG_H
  24 #include "config.h"
  25 #endif
  26 #include <errno.h>
  27 #include <string>
  28 #include <set>
  29 #include <sys/types.h>
  30 #include <sys/stat.h>
  31 #include <unistd.h>
  32 #include <fstream>
  33 #include <fcntl.h>
  34 #include <sstream>
  35 #include <boost/algorithm/string.hpp>
  36 #include <system_error>
  37
  38 #include "pdns/dnsseckeeper.hh"
  39 #include "pdns/dnssecinfra.hh"
  40 #include "pdns/base32.hh"
  41 #include "pdns/namespaces.hh"
  42 #include "pdns/dns.hh"
  43 #include "pdns/dnsbackend.hh"
  44 #include "bindbackend2.hh"
  45 #include "pdns/dnspacket.hh"
  46 #include "pdns/zoneparser-tng.hh"
  47 #include "pdns/bindparserclasses.hh"
  48 #include "pdns/logger.hh"
  49 #include "pdns/arguments.hh"
  50 #include "pdns/qtype.hh"
  51 #include "pdns/misc.hh"
  52 #include "pdns/dynlistener.hh"
  53 #include "pdns/lock.hh"
  54 #include "pdns/namespaces.hh"
  55
  56 /*
  57    All instances of this backend share one s_state, which is indexed by zone name and zone id.
  58    The s_state is protected by a read/write lock, and the goal it to only interact with it briefly.
  59    When a query comes in, we take a read lock and COPY the best zone to answer from s_state (BB2DomainInfo object)
  60    All answers are served from this copy.
  61
  62    To interact with s_state, use safeGetBBDomainInfo (search on name or id), safePutBBDomainInfo (to update)
  63    or safeRemoveBBDomainInfo. These all lock as they should.
  64
  65    Several functions need to traverse s_state to get data for the rest of PowerDNS. When doing so,
  66    you need to manually take the s_state_lock (read).
  67
  68    Parsing zones happens with parseZone(), which fills a BB2DomainInfo object. This can then be stored with safePutBBDomainInfo.
  69
  70    Finally, the BB2DomainInfo contains all records as a LookButDontTouch object. This makes sure you only look, but don't touch, since
  71    the records might be in use in other places.
  72 */
  73
  74 Bind2Backend::state_t Bind2Backend::s_state;
  75 int Bind2Backend::s_first=1;
  76 bool Bind2Backend::s_ignore_broken_records=false;
  77
  78 pthread_rwlock_t Bind2Backend::s_state_lock=PTHREAD_RWLOCK_INITIALIZER;
  79 pthread_mutex_t Bind2Backend::s_supermaster_config_lock=PTHREAD_MUTEX_INITIALIZER; // protects writes to config file
  80 pthread_mutex_t Bind2Backend::s_startup_lock=PTHREAD_MUTEX_INITIALIZER;
  81 string Bind2Backend::s_binddirectory;
  82
  83 template <typename T>
  84 std::mutex LookButDontTouch<T>::s_lock;
  85
  86 BB2DomainInfo::BB2DomainInfo()
  87 {
  88   d_loaded=false;
  89   d_lastcheck=0;
  90   d_checknow=false;
  91   d_status="Unknown";
  92 }
  93
  94 void BB2DomainInfo::setCheckInterval(time_t seconds)
  95 {
  96   d_checkinterval=seconds;
  97 }
  98
  99 bool BB2DomainInfo::current()
 100 {
 101   if(d_checknow) {
 102     return false;
 103   }
 104
 105   if(!d_checkinterval)
 106     return true;
 107
 108   if(time(0) - d_lastcheck < d_checkinterval)
 109     return true;
 110
 111   if(d_filename.empty())
 112     return true;
 113
 114   return (getCtime()==d_ctime);
 115 }
 116
 117 time_t BB2DomainInfo::getCtime()
 118 {
 119   struct stat buf;
 120
 121   if(d_filename.empty() || stat(d_filename.c_str(),&buf)<0)
 122     return 0;
 123   d_lastcheck=time(0);
 124   return buf.st_ctime;
 125 }
 126
 127 void BB2DomainInfo::setCtime()
 128 {
 129   struct stat buf;
 130   if(stat(d_filename.c_str(),&buf)<0)
 131     return;
 132   d_ctime=buf.st_ctime;
 133 }
 134
 135 bool Bind2Backend::safeGetBBDomainInfo(int id, BB2DomainInfo* bbd)
 136 {
 137   ReadLock rl(&s_state_lock);
 138   state_t::const_iterator iter = s_state.find(id);
 139   if(iter == s_state.end())
 140     return false;
 141   *bbd=*iter;
 142   return true;
 143 }
 144
 145 bool Bind2Backend::safeGetBBDomainInfo(const DNSName& name, BB2DomainInfo* bbd)
 146 {
 147   ReadLock rl(&s_state_lock);
 148   typedef state_t::index<NameTag>::type nameindex_t;
 149   nameindex_t& nameindex = boost::multi_index::get<NameTag>(s_state);
 150
 151   nameindex_t::const_iterator iter = nameindex.find(name);
 152   if(iter == nameindex.end())
 153     return false;
 154   *bbd=*iter;
 155   return true;
 156 }
 157
 158 bool Bind2Backend::safeRemoveBBDomainInfo(const DNSName& name)
 159 {
 160   WriteLock rl(&s_state_lock);
 161   typedef state_t::index<NameTag>::type nameindex_t;
 162   nameindex_t& nameindex = boost::multi_index::get<NameTag>(s_state);
 163
 164   nameindex_t::iterator iter = nameindex.find(name);
 165   if(iter == nameindex.end())
 166     return false;
 167   nameindex.erase(iter);
 168   return true;
 169 }
 170
 171 void Bind2Backend::safePutBBDomainInfo(const BB2DomainInfo& bbd)
 172 {
 173   WriteLock rl(&s_state_lock);
 174   replacing_insert(s_state, bbd);
 175 }
 176
 177 void Bind2Backend::setNotified(uint32_t id, uint32_t serial)
 178 {
 179   BB2DomainInfo bbd;
 180   if (!safeGetBBDomainInfo(id, &bbd))
 181     return;
 182   bbd.d_lastnotified = serial;
 183   safePutBBDomainInfo(bbd);
 184 }
 185
 186 void Bind2Backend::setFresh(uint32_t domain_id)
 187 {
 188   BB2DomainInfo bbd;
 189   if(safeGetBBDomainInfo(domain_id, &bbd)) {
 190     bbd.d_lastcheck=time(0);
 191     safePutBBDomainInfo(bbd);
 192   }
 193 }
 194
 195 bool Bind2Backend::startTransaction(const DNSName &qname, int id)
 196 {
 197   if(id < 0) {
 198     d_transaction_tmpname.clear();
 199     d_transaction_id=id;
 200     return false;
 201   }
 202   if(id == 0) {
 203     throw DBException("domain_id 0 is invalid for this backend.");
 204   }
 205
 206   d_transaction_id=id;
 207   BB2DomainInfo bbd;
 208   if(safeGetBBDomainInfo(id, &bbd)) {
 209     d_transaction_tmpname = bbd.d_filename + "XXXXXX";
 210     int fd = mkstemp(&d_transaction_tmpname.at(0));
 211     if (fd == -1) {
 212       throw DBException("Unable to create a unique temporary zonefile '"+d_transaction_tmpname+"': "+stringerror());
 213       return false;
 214     }
 215
 216     d_of = std::unique_ptr<ofstream>(new ofstream(d_transaction_tmpname.c_str()));
 217     if(!*d_of) {
 218       unlink(d_transaction_tmpname.c_str());
 219       close(fd);
 220       fd = -1;
 221       d_of.reset();
 222       throw DBException("Unable to open temporary zonefile '"+d_transaction_tmpname+"': "+stringerror());
 223     }
 224     close(fd);
 225     fd = -1;
 226
 227     *d_of<<"; Written by PowerDNS, don't edit!"<<endl;
 228     *d_of<<"; Zone '"<<bbd.d_name<<"' retrieved from master "<<endl<<"; at "<<nowTime()<<endl; // insert master info here again
 229
 230     return true;
 231   }
 232   return false;
 233 }
 234
 235 bool Bind2Backend::commitTransaction()
 236 {
 237   if(d_transaction_id < 0)
 238     return false;
 239   d_of.reset();
 240
 241   BB2DomainInfo bbd;
 242   if(safeGetBBDomainInfo(d_transaction_id, &bbd)) {
 243     if(rename(d_transaction_tmpname.c_str(), bbd.d_filename.c_str())<0)
 244     throw DBException("Unable to commit (rename to: '" + bbd.d_filename+"') AXFRed zone: "+stringerror());
 245     queueReloadAndStore(bbd.d_id);
 246   }
 247
 248   d_transaction_id=0;
 249
 250   return true;
 251 }
 252
 253 bool Bind2Backend::abortTransaction()
 254 {
 255   // -1 = dnssec speciality
 256   // 0  = invalid transact
 257   // >0 = actual transaction
 258   if(d_transaction_id > 0) {
 259     unlink(d_transaction_tmpname.c_str());
 260     d_of.reset();
 261     d_transaction_id=0;
 262   }
 263
 264   return true;
 265 }
 266
 267 bool Bind2Backend::feedRecord(const DNSResourceRecord &rr, const DNSName &ordername, bool ordernameIsNSEC3)
 268 {
 269   BB2DomainInfo bbd;
 270   if (!safeGetBBDomainInfo(d_transaction_id, &bbd))
 271     return false;
 272
 273   string qname;
 274   string name = bbd.d_name.toString();
 275   if (bbd.d_name.empty()) {
 276     qname = rr.qname.toString();
 277   }
 278   else if (rr.qname.isPartOf(bbd.d_name)) {
 279     if (rr.qname == bbd.d_name) {
 280       qname = "@";
 281     }
 282     else {
 283       DNSName relName = rr.qname.makeRelative(bbd.d_name);
 284       qname = relName.toStringNoDot();
 285     }
 286   }
 287   else {
 288     throw DBException("out-of-zone data '"+rr.qname.toLogString()+"' during AXFR of zone '"+bbd.d_name.toLogString()+"'");
 289   }
 290
 291   shared_ptr<DNSRecordContent> drc(DNSRecordContent::mastermake(rr.qtype.getCode(), 1, rr.content));
 292   string content = drc->getZoneRepresentation();
 293
 294   // SOA needs stripping too! XXX FIXME - also, this should not be here I think
 295   switch(rr.qtype.getCode()) {
 296   case QType::MX:
 297   case QType::SRV:
 298   case QType::CNAME:
 299   case QType::DNAME:
 300   case QType::NS:
 301     stripDomainSuffix(&content, name);
 302     // fallthrough
 303   default:
 304     if (d_of && *d_of) {
 305       *d_of<<qname<<"\t"<<rr.ttl<<"\t"<<rr.qtype.getName()<<"\t"<<content<<endl;
 306     }
 307   }
 308   return true;
 309 }
 310
 311 void Bind2Backend::getUpdatedMasters(vector<DomainInfo> *changedDomains)
 312 {
 313   vector<DomainInfo> consider;
 314   {
 315     ReadLock rl(&s_state_lock);
 316
 317     for(state_t::const_iterator i = s_state.begin(); i != s_state.end() ; ++i) {
 318       if(i->d_kind != DomainInfo::Master && this->alsoNotify.empty() && i->d_also_notify.empty())
 319         continue;
 320
 321       DomainInfo di;
 322       di.id=i->d_id;
 323       di.zone=i->d_name;
 324       di.last_check=i->d_lastcheck;
 325       di.notified_serial=i->d_lastnotified;
 326       di.backend=this;
 327       di.kind=DomainInfo::Master;
 328       consider.push_back(di);
 329     }
 330   }
 331
 332   SOAData soadata;
 333   for(DomainInfo& di :  consider) {
 334     soadata.serial=0;
 335     try {
 336       this->getSOA(di.zone, soadata); // we might not *have* a SOA yet, but this might trigger a load of it
 337     }
 338     catch(...) {
 339       continue;
 340     }
 341     if(di.notified_serial != soadata.serial) {
 342       BB2DomainInfo bbd;
 343       if(safeGetBBDomainInfo(di.id, &bbd)) {
 344         bbd.d_lastnotified=soadata.serial;
 345         safePutBBDomainInfo(bbd);
 346       }
 347       if(di.notified_serial)  { // don't do notification storm on startup
 348         di.serial=soadata.serial;
 349         changedDomains->push_back(di);
 350       }
 351     }
 352   }
 353 }
 354
 355 void Bind2Backend::getAllDomains(vector<DomainInfo> *domains, bool include_disabled)
 356 {
 357   SOAData soadata;
 358
 359   // prevent deadlock by using getSOA() later on
 360   {
 361     ReadLock rl(&s_state_lock);
 362
 363     for(state_t::const_iterator i = s_state.begin(); i != s_state.end() ; ++i) {
 364       DomainInfo di;
 365       di.id=i->d_id;
 366       di.zone=i->d_name;
 367       di.last_check=i->d_lastcheck;
 368       di.kind=i->d_kind;
 369       di.masters=i->d_masters;
 370       di.backend=this;
 371       domains->push_back(di);
 372     };
 373   }
 374
 375   for(DomainInfo &di :  *domains) {
 376     // do not corrupt di if domain supplied by another backend.
 377     if (di.backend != this)
 378       continue;
 379     try {
 380       this->getSOA(di.zone, soadata);
 381     } catch(...) {
 382       continue;
 383     }
 384     di.serial=soadata.serial;
 385   }
 386 }
 387
 388 void Bind2Backend::getUnfreshSlaveInfos(vector<DomainInfo> *unfreshDomains)
 389 {
 390   vector<DomainInfo> domains;
 391   {
 392     ReadLock rl(&s_state_lock);
 393     for(state_t::const_iterator i = s_state.begin(); i != s_state.end() ; ++i) {
 394       if(i->d_kind != DomainInfo::Slave)
 395         continue;
 396       DomainInfo sd;
 397       sd.id=i->d_id;
 398       sd.zone=i->d_name;
 399       sd.masters=i->d_masters;
 400       sd.last_check=i->d_lastcheck;
 401       sd.backend=this;
 402       sd.kind=DomainInfo::Slave;
 403       domains.push_back(sd);
 404     }
 405   }
 406
 407   for(DomainInfo &sd :  domains) {
 408     SOAData soadata;
 409     soadata.refresh=0;
 410     soadata.serial=0;
 411     try {
 412       getSOA(sd.zone,soadata); // we might not *have* a SOA yet
 413     }
 414     catch(...){}
 415     sd.serial=soadata.serial;
 416     if(sd.last_check+soadata.refresh < (unsigned int)time(0))
 417       unfreshDomains->push_back(sd);
 418   }
 419 }
 420
 421 bool Bind2Backend::getDomainInfo(const DNSName& domain, DomainInfo &di, bool getSerial)
 422 {
 423   BB2DomainInfo bbd;
 424   if(!safeGetBBDomainInfo(domain, &bbd))
 425     return false;
 426
 427   di.id=bbd.d_id;
 428   di.zone=domain;
 429   di.masters=bbd.d_masters;
 430   di.last_check=bbd.d_lastcheck;
 431   di.backend=this;
 432   di.kind=bbd.d_kind;
 433   di.serial=0;
 434   if(getSerial) {
 435     try {
 436       SOAData sd;
 437       sd.serial=0;
 438
 439       getSOA(bbd.d_name,sd); // we might not *have* a SOA yet
 440       di.serial=sd.serial;
 441     }
 442     catch(...){}
 443   }
 444
 445   return true;
 446 }
 447
 448 void Bind2Backend::alsoNotifies(const DNSName& domain, set<string> *ips)
 449 {
 450   // combine global list with local list
 451   for(set<string>::iterator i = this->alsoNotify.begin(); i != this->alsoNotify.end(); i++) {
 452     (*ips).insert(*i);
 453   }
 454   // check metadata too if available
 455   vector<string> meta;
 456   if (getDomainMetadata(domain, "ALSO-NOTIFY", meta)) {
 457     for(const auto& str: meta) {
 458       (*ips).insert(str);
 459     }
 460   }
 461   ReadLock rl(&s_state_lock);
 462   for(state_t::const_iterator i = s_state.begin(); i != s_state.end() ; ++i) {
 463     if(i->d_name == domain) {
 464       for(set<string>::iterator it = i->d_also_notify.begin(); it != i->d_also_notify.end(); it++) {
 465         (*ips).insert(*it);
 466       }
 467       return;
 468     }
 469   }
 470 }
 471
 472 // only parses, does NOT add to s_state!
 473 void Bind2Backend::parseZoneFile(BB2DomainInfo *bbd)
 474 {
 475   NSEC3PARAMRecordContent ns3pr;
 476   bool nsec3zone;
 477   if (d_hybrid) {
 478     DNSSECKeeper dk;
 479     nsec3zone=dk.getNSEC3PARAM(bbd->d_name, &ns3pr);
 480   } else
 481     nsec3zone=getNSEC3PARAM(bbd->d_name, &ns3pr);
 482
 483   bbd->d_records = shared_ptr<recordstorage_t>(new recordstorage_t());
 484   ZoneParserTNG zpt(bbd->d_filename, bbd->d_name, s_binddirectory);
 485   zpt.setMaxGenerateSteps(::arg().asNum("max-generate-steps"));
 486   DNSResourceRecord rr;
 487   string hashed;
 488   while(zpt.get(rr)) {
 489     if(rr.qtype.getCode() == QType::NSEC || rr.qtype.getCode() == QType::NSEC3 || rr.qtype.getCode() == QType::NSEC3PARAM)
 490       continue; // we synthesise NSECs on demand
 491
 492     insertRecord(*bbd, rr.qname, rr.qtype, rr.content, rr.ttl, "");
 493   }
 494   fixupOrderAndAuth(*bbd, nsec3zone, ns3pr);
 495   doEmptyNonTerminals(*bbd, nsec3zone, ns3pr);
 496   bbd->setCtime();
 497   bbd->d_loaded=true;
 498   bbd->d_checknow=false;
 499   bbd->d_status="parsed into memory at "+nowTime();
 500 }
 501
 502 /** THIS IS AN INTERNAL FUNCTION! It does moadnsparser prio impedance matching
 503     Much of the complication is due to the efforts to benefit from std::string reference counting copy on write semantics */
 504 void Bind2Backend::insertRecord(BB2DomainInfo& bb2, const DNSName &qname, const QType &qtype, const string &content, int ttl, const std::string& hashed, bool *auth)
 505 {
 506   Bind2DNSRecord bdr;
 507   shared_ptr<recordstorage_t> records = bb2.d_records.getWRITABLE();
 508   bdr.qname=qname;
 509
 510   if(bb2.d_name.empty())
 511     ;
 512   else if(bdr.qname.isPartOf(bb2.d_name))
 513     bdr.qname = bdr.qname.makeRelative(bb2.d_name);
 514   else {
 515     string msg = "Trying to insert non-zone data, name='"+bdr.qname.toLogString()+"', qtype="+qtype.getName()+", zone='"+bb2.d_name.toLogString()+"'";
 516     if(s_ignore_broken_records) {
 517         g_log<<Logger::Warning<<msg<< " ignored" << endl;
 518         return;
 519     }
 520     else
 521       throw PDNSException(msg);
 522   }
 523
 524 //  bdr.qname.swap(bdr.qname);
 525
 526   if(!records->empty() && bdr.qname==boost::prior(records->end())->qname)
 527     bdr.qname=boost::prior(records->end())->qname;
 528
 529   bdr.qname=bdr.qname;
 530   bdr.qtype=qtype.getCode();
 531   bdr.content=content;
 532   bdr.nsec3hash = hashed;
 533
 534   if (auth) // Set auth on empty non-terminals
 535     bdr.auth=*auth;
 536   else
 537     bdr.auth=true;
 538
 539   bdr.ttl=ttl;
 540   records->insert(bdr);
 541 }
 542
 543 string Bind2Backend::DLReloadNowHandler(const vector<string>&parts, Utility::pid_t ppid)
 544 {
 545   ostringstream ret;
 546
 547   for(vector<string>::const_iterator i=parts.begin()+1;i<parts.end();++i) {
 548     BB2DomainInfo bbd;
 549     DNSName zone(*i);
 550     if(safeGetBBDomainInfo(zone, &bbd)) {
 551       Bind2Backend bb2;
 552       bb2.queueReloadAndStore(bbd.d_id);
 553       if (!safeGetBBDomainInfo(zone, &bbd)) // Read the *new* domain status
 554           ret << *i << ": [missing]\n";
 555       else
 556           ret<< *i << ": "<< (bbd.d_wasRejectedLastReload ? "[rejected]": "") <<"\t"<<bbd.d_status<<"\n";
 557     }
 558     else
 559       ret<< *i << " no such domain\n";
 560   }
 561   if(ret.str().empty())
 562     ret<<"no domains reloaded";
 563   return ret.str();
 564 }
 565
 566
 567 string Bind2Backend::DLDomStatusHandler(const vector<string>&parts, Utility::pid_t ppid)
 568 {
 569   ostringstream ret;
 570
 571   if(parts.size() > 1) {
 572     for(vector<string>::const_iterator i=parts.begin()+1;i<parts.end();++i) {
 573       BB2DomainInfo bbd;
 574       if(safeGetBBDomainInfo(DNSName(*i), &bbd)) {
 575         ret<< *i << ": "<< (bbd.d_loaded ? "": "[rejected]") <<"\t"<<bbd.d_status<<"\n";
 576     }
 577       else
 578         ret<< *i << " no such domain\n";
 579     }
 580   }
 581   else {
 582     ReadLock rl(&s_state_lock);
 583     for(state_t::const_iterator i = s_state.begin(); i != s_state.end() ; ++i) {
 584       ret<< i->d_name << ": "<< (i->d_loaded ? "": "[rejected]") <<"\t"<<i->d_status<<"\n";
 585     }
 586   }
 587
 588   if(ret.str().empty())
 589     ret<<"no domains passed";
 590
 591   return ret.str();
 592 }
 593
 594 string Bind2Backend::DLListRejectsHandler(const vector<string>&parts, Utility::pid_t ppid)
 595 {
 596   ostringstream ret;
 597   ReadLock rl(&s_state_lock);
 598   for(state_t::const_iterator i = s_state.begin(); i != s_state.end() ; ++i) {
 599     if(!i->d_loaded)
 600       ret<<i->d_name<<"\t"<<i->d_status<<endl;
 601   }
 602   return ret.str();
 603 }
 604
 605 string Bind2Backend::DLAddDomainHandler(const vector<string>&parts, Utility::pid_t ppid)
 606 {
 607   if(parts.size() < 3)
 608     return "ERROR: Domain name and zone filename are required";
 609
 610   DNSName domainname(parts[1]);
 611   const string &filename = parts[2];
 612   BB2DomainInfo bbd;
 613   if(safeGetBBDomainInfo(domainname, &bbd))
 614     return "Already loaded";
 615
 616   if (!boost::starts_with(filename, "/") && ::arg()["chroot"].empty())
 617     return "Unable to load zone " + domainname.toLogString() + " from " + filename + " as the filename is not absolute.";
 618
 619   struct stat buf;
 620   if (stat(filename.c_str(), &buf) != 0)
 621     return "Unable to load zone " + domainname.toLogString() + " from " + filename + ": " + strerror(errno);
 622
 623   Bind2Backend bb2; // createdomainentry needs access to our configuration
 624   bbd=bb2.createDomainEntry(domainname, filename);
 625   bbd.d_filename=filename;
 626   bbd.d_checknow=true;
 627   bbd.d_loaded=true;
 628   bbd.d_lastcheck=0;
 629   bbd.d_status="parsing into memory";
 630   bbd.setCtime();
 631
 632   safePutBBDomainInfo(bbd);
 633
 634   g_log<<Logger::Warning<<"Zone "<<domainname<< " loaded"<<endl;
 635   return "Loaded zone " + domainname.toLogString() + " from " + filename;
 636 }
 637
 638 Bind2Backend::Bind2Backend(const string &suffix, bool loadZones)
 639 {
 640   d_getAllDomainMetadataQuery_stmt = NULL;
 641   d_getDomainMetadataQuery_stmt = NULL;
 642   d_deleteDomainMetadataQuery_stmt = NULL;
 643   d_insertDomainMetadataQuery_stmt = NULL;
 644   d_getDomainKeysQuery_stmt = NULL;
 645   d_deleteDomainKeyQuery_stmt = NULL;
 646   d_insertDomainKeyQuery_stmt = NULL;
 647   d_GetLastInsertedKeyIdQuery_stmt = NULL;
 648   d_activateDomainKeyQuery_stmt = NULL;
 649   d_deactivateDomainKeyQuery_stmt = NULL;
 650   d_getTSIGKeyQuery_stmt = NULL;
 651   d_setTSIGKeyQuery_stmt = NULL;
 652   d_deleteTSIGKeyQuery_stmt = NULL;
 653   d_getTSIGKeysQuery_stmt = NULL;
 654
 655   setArgPrefix("bind"+suffix);
 656   d_logprefix="[bind"+suffix+"backend]";
 657   d_hybrid=mustDo("hybrid");
 658   d_transaction_id=0;
 659   s_ignore_broken_records=mustDo("ignore-broken-records");
 660
 661   if (!loadZones && d_hybrid)
 662     return;
 663
 664   Lock l(&s_startup_lock);
 665
 666   setupDNSSEC();
 667   if(!s_first) {
 668     return;
 669   }
 670
 671   if(loadZones) {
 672     loadConfig();
 673     s_first=0;
 674   }
 675
 676   extern DynListener *dl;
 677   dl->registerFunc("BIND-RELOAD-NOW", &DLReloadNowHandler, "bindbackend: reload domains", "<domains>");
 678   dl->registerFunc("BIND-DOMAIN-STATUS", &DLDomStatusHandler, "bindbackend: list status of all domains", "[domains]");
 679   dl->registerFunc("BIND-LIST-REJECTS", &DLListRejectsHandler, "bindbackend: list rejected domains");
 680   dl->registerFunc("BIND-ADD-ZONE", &DLAddDomainHandler, "bindbackend: add zone", "<domain> <filename>");
 681 }
 682
 683 Bind2Backend::~Bind2Backend()
 684 { freeStatements(); } // deallocate statements
 685
 686 void Bind2Backend::rediscover(string *status)
 687 {
 688   loadConfig(status);
 689 }
 690
 691 void Bind2Backend::reload()
 692 {
 693   WriteLock rwl(&s_state_lock);
 694   for(state_t::iterator i = s_state.begin(); i != s_state.end() ; ++i) {
 695     i->d_checknow=true; // being a bit cheeky here, don't index state_t on this (mutable)
 696   }
 697 }
 698
 699 void Bind2Backend::fixupOrderAndAuth(BB2DomainInfo& bbd, bool nsec3zone, NSEC3PARAMRecordContent ns3pr)
 700 {
 701   shared_ptr<recordstorage_t> records = bbd.d_records.getWRITABLE();
 702
 703   bool skip;
 704   DNSName shorter;
 705   set<DNSName> nssets, dssets;
 706
 707   for(const auto& bdr: *records) {
 708     if(!bdr.qname.isRoot() && bdr.qtype == QType::NS)
 709       nssets.insert(bdr.qname);
 710     else if(bdr.qtype == QType::DS)
 711       dssets.insert(bdr.qname);
 712   }
 713
 714   for(auto iter = records->begin(); iter != records->end(); iter++) {
 715     skip = false;
 716     shorter = iter->qname;
 717
 718     if (!iter->qname.isRoot() && shorter.chopOff() && !iter->qname.isRoot()) {
 719       do {
 720         if(nssets.count(shorter)) {
 721           skip = true;
 722           break;
 723         }
 724       } while(shorter.chopOff() && !iter->qname.isRoot());
 725     }
 726
 727     iter->auth = (!skip && (iter->qtype == QType::DS || iter->qtype == QType::RRSIG || !nssets.count(iter->qname)));
 728
 729     if(!skip && nsec3zone && iter->qtype != QType::RRSIG && (iter->auth || (iter->qtype == QType::NS && !ns3pr.d_flags) || dssets.count(iter->qname))) {
 730       Bind2DNSRecord bdr = *iter;
 731       bdr.nsec3hash = toBase32Hex(hashQNameWithSalt(ns3pr, bdr.qname+bbd.d_name));
 732       records->replace(iter, bdr);
 733     }
 734
 735     // cerr<<iter->qname<<"\t"<<QType(iter->qtype).getName()<<"\t"<<iter->nsec3hash<<"\t"<<iter->auth<<endl;
 736   }
 737 }
 738
 739 void Bind2Backend::doEmptyNonTerminals(BB2DomainInfo& bbd, bool nsec3zone, NSEC3PARAMRecordContent ns3pr)
 740 {
 741   shared_ptr<const recordstorage_t> records = bbd.d_records.get();
 742
 743   bool auth;
 744   DNSName shorter;
 745   set<DNSName> qnames;
 746   map<DNSName, bool> nonterm;
 747
 748   uint32_t maxent = ::arg().asNum("max-ent-entries");
 749
 750   for(const auto& bdr : *records)
 751     qnames.insert(bdr.qname);
 752
 753   for(const auto& bdr : *records) {
 754
 755     if (!bdr.auth && bdr.qtype == QType::NS)
 756       auth = (!nsec3zone || !ns3pr.d_flags);
 757     else
 758       auth = bdr.auth;
 759
 760     shorter = bdr.qname;
 761     while(shorter.chopOff())
 762     {
 763       if(!qnames.count(shorter))
 764       {
 765         if(!(maxent))
 766         {
 767           g_log<<Logger::Error<<"Zone '"<<bbd.d_name<<"' has too many empty non terminals."<<endl;
 768           return;
 769         }
 770
 771         if (!nonterm.count(shorter)) {
 772           nonterm.insert(pair<DNSName, bool>(shorter, auth));
 773           --maxent;
 774         } else if (auth)
 775           nonterm[shorter] = true;
 776       }
 777     }
 778   }
 779
 780   DNSResourceRecord rr;
 781   rr.qtype = "#0";
 782   rr.content = "";
 783   rr.ttl = 0;
 784   for(auto& nt : nonterm)
 785   {
 786     string hashed;
 787     rr.qname = nt.first + bbd.d_name;
 788     if(nsec3zone && nt.second)
 789       hashed = toBase32Hex(hashQNameWithSalt(ns3pr, rr.qname));
 790     insertRecord(bbd, rr.qname, rr.qtype, rr.content, rr.ttl, hashed, &nt.second);
 791
 792     // cerr<<rr.qname<<"\t"<<rr.qtype.getName()<<"\t"<<hashed<<"\t"<<nt.second<<endl;
 793   }
 794 }
 795
 796 void Bind2Backend::loadConfig(string* status)
 797 {
 798   static int domain_id=1;
 799
 800   if(!getArg("config").empty()) {
 801     BindParser BP;
 802     try {
 803       BP.parse(getArg("config"));
 804     }
 805     catch(PDNSException &ae) {
 806       g_log<<Logger::Error<<"Error parsing bind configuration: "<<ae.reason<<endl;
 807       throw;
 808     }
 809
 810     vector<BindDomainInfo> domains=BP.getDomains();
 811     this->alsoNotify = BP.getAlsoNotify();
 812
 813     s_binddirectory=BP.getDirectory();
 814     //    ZP.setDirectory(d_binddirectory);
 815
 816     g_log<<Logger::Warning<<d_logprefix<<" Parsing "<<domains.size()<<" domain(s), will report when done"<<endl;
 817
 818     set<DNSName> oldnames, newnames;
 819     {
 820       ReadLock rl(&s_state_lock);
 821       for(const BB2DomainInfo& bbd :  s_state) {
 822         oldnames.insert(bbd.d_name);
 823       }
 824     }
 825     int rejected=0;
 826     int newdomains=0;
 827
 828     struct stat st;
 829
 830     for(vector<BindDomainInfo>::iterator i=domains.begin(); i!=domains.end(); ++i)
 831     {
 832       if(stat(i->filename.c_str(), &st) == 0) {
 833         i->d_dev = st.st_dev;
 834         i->d_ino = st.st_ino;
 835       }
 836     }
 837
 838     sort(domains.begin(), domains.end()); // put stuff in inode order
 839     for(vector<BindDomainInfo>::const_iterator i=domains.begin();
 840         i!=domains.end();
 841         ++i)
 842       {
 843         if (!(i->hadFileDirective)) {
 844           g_log<<Logger::Warning<<d_logprefix<<" Zone '"<<i->name<<"' has no 'file' directive set in "<<getArg("config")<<endl;
 845           rejected++;
 846           continue;
 847         }
 848
 849         if(i->type == "")
 850           g_log<<Logger::Notice<<d_logprefix<<" Zone '"<<i->name<<"' has no type specified, assuming 'native'"<<endl;
 851         if(i->type!="master" && i->type!="slave" && i->type != "native" && i->type != "") {
 852           g_log<<Logger::Warning<<d_logprefix<<" Warning! Skipping zone '"<<i->name<<"' because type '"<<i->type<<"' is invalid"<<endl;
 853           rejected++;
 854           continue;
 855         }
 856
 857         BB2DomainInfo bbd;
 858         bool isNew = false;
 859
 860         if(!safeGetBBDomainInfo(i->name, &bbd)) {
 861           isNew = true;
 862           bbd.d_id=domain_id++;
 863           bbd.setCheckInterval(getArgAsNum("check-interval"));
 864           bbd.d_lastnotified=0;
 865           bbd.d_loaded=false;
 866         }
 867
 868         // overwrite what we knew about the domain
 869         bbd.d_name=i->name;
 870         bool filenameChanged = (bbd.d_filename!=i->filename);
 871         bbd.d_filename=i->filename;
 872         bbd.d_masters=i->masters;
 873         bbd.d_also_notify=i->alsoNotify;
 874
 875         bbd.d_kind = DomainInfo::Native;
 876         if (i->type == "master")
 877           bbd.d_kind = DomainInfo::Master;
 878         if (i->type == "slave")
 879           bbd.d_kind = DomainInfo::Slave;
 880
 881         newnames.insert(bbd.d_name);
 882         if(filenameChanged || !bbd.d_loaded || !bbd.current()) {
 883           g_log<<Logger::Info<<d_logprefix<<" parsing '"<<i->name<<"' from file '"<<i->filename<<"'"<<endl;
 884
 885           try {
 886             parseZoneFile(&bbd);
 887           }
 888           catch(PDNSException &ae) {
 889             ostringstream msg;
 890             msg<<" error at "+nowTime()+" parsing '"<<i->name<<"' from file '"<<i->filename<<"': "<<ae.reason;
 891
 892             if(status)
 893               *status+=msg.str();
 894             bbd.d_status=msg.str();
 895
 896             g_log<<Logger::Warning<<d_logprefix<<msg.str()<<endl;
 897             rejected++;
 898           }
 899           catch(std::system_error &ae) {
 900             ostringstream msg;
 901             if (ae.code().value() == ENOENT && isNew && i->type == "slave")
 902               msg<<" error at "+nowTime()<<" no file found for new slave domain '"<<i->name<<"'. Has not been AXFR'd yet";
 903             else
 904               msg<<" error at "+nowTime()+" parsing '"<<i->name<<"' from file '"<<i->filename<<"': "<<ae.what();
 905
 906             if(status)
 907               *status+=msg.str();
 908             bbd.d_status=msg.str();
 909             g_log<<Logger::Warning<<d_logprefix<<msg.str()<<endl;
 910             rejected++;
 911           }
 912           catch(std::exception &ae) {
 913             ostringstream msg;
 914             msg<<" error at "+nowTime()+" parsing '"<<i->name<<"' from file '"<<i->filename<<"': "<<ae.what();
 915
 916             if(status)
 917               *status+=msg.str();
 918             bbd.d_status=msg.str();
 919
 920             g_log<<Logger::Warning<<d_logprefix<<msg.str()<<endl;
 921             rejected++;
 922           }
 923           safePutBBDomainInfo(bbd);
 924
 925         }
 926       }
 927     vector<DNSName> diff;
 928
 929     set_difference(oldnames.begin(), oldnames.end(), newnames.begin(), newnames.end(), back_inserter(diff));
 930     unsigned int remdomains=diff.size();
 931
 932     for(const DNSName& name: diff) {
 933       safeRemoveBBDomainInfo(name);
 934     }
 935
 936     // count number of entirely new domains
 937     diff.clear();
 938     set_difference(newnames.begin(), newnames.end(), oldnames.begin(), oldnames.end(), back_inserter(diff));
 939     newdomains=diff.size();
 940
 941     ostringstream msg;
 942     msg<<" Done parsing domains, "<<rejected<<" rejected, "<<newdomains<<" new, "<<remdomains<<" removed";
 943     if(status)
 944       *status=msg.str();
 945
 946     g_log<<Logger::Error<<d_logprefix<<msg.str()<<endl;
 947   }
 948 }
 949
 950 void Bind2Backend::queueReloadAndStore(unsigned int id)
 951 {
 952   BB2DomainInfo bbold;
 953   try {
 954     if(!safeGetBBDomainInfo(id, &bbold))
 955       return;
 956     BB2DomainInfo bbnew(bbold);
 957     parseZoneFile(&bbnew);
 958     bbnew.d_checknow=false;
 959     bbnew.d_wasRejectedLastReload=false;
 960     safePutBBDomainInfo(bbnew);
 961     g_log<<Logger::Warning<<"Zone '"<<bbnew.d_name<<"' ("<<bbnew.d_filename<<") reloaded"<<endl;
 962   }
 963   catch(PDNSException &ae) {
 964     ostringstream msg;
 965     msg<<" error at "+nowTime()+" parsing '"<<bbold.d_name<<"' from file '"<<bbold.d_filename<<"': "<<ae.reason;
 966     g_log<<Logger::Warning<<" error parsing '"<<bbold.d_name<<"' from file '"<<bbold.d_filename<<"': "<<ae.reason<<endl;
 967     bbold.d_status=msg.str();
 968     bbold.d_wasRejectedLastReload=true;
 969     safePutBBDomainInfo(bbold);
 970   }
 971   catch(std::exception &ae) {
 972     ostringstream msg;
 973     msg<<" error at "+nowTime()+" parsing '"<<bbold.d_name<<"' from file '"<<bbold.d_filename<<"': "<<ae.what();
 974     g_log<<Logger::Warning<<" error parsing '"<<bbold.d_name<<"' from file '"<<bbold.d_filename<<"': "<<ae.what()<<endl;
 975     bbold.d_status=msg.str();
 976     bbold.d_wasRejectedLastReload=true;
 977     safePutBBDomainInfo(bbold);
 978   }
 979 }
 980
 981 bool Bind2Backend::findBeforeAndAfterUnhashed(BB2DomainInfo& bbd, const DNSName& qname, DNSName& unhashed, DNSName& before, DNSName& after)
 982 {
 983   shared_ptr<const recordstorage_t> records = bbd.d_records.get();
 984
 985   // for(const auto& record: *records)
 986   //   cerr<<record.qname<<"\t"<<makeHexDump(record.qname.toDNSString())<<endl;
 987
 988   recordstorage_t::const_iterator iterBefore, iterAfter;
 989
 990   iterBefore = iterAfter = records->upper_bound(qname.makeLowerCase());
 991
 992   if(iterBefore != records->begin())
 993     --iterBefore;
 994   while((!iterBefore->auth && iterBefore->qtype != QType::NS) || !iterBefore->qtype)
 995     --iterBefore;
 996   before=iterBefore->qname;
 997
 998   if(iterAfter == records->end()) {
 999     iterAfter = records->begin();
1000   } else {
1001     while((!iterAfter->auth && iterAfter->qtype != QType::NS) || !iterAfter->qtype) {
1002       ++iterAfter;
1003       if(iterAfter == records->end()) {
1004         iterAfter = records->begin();
1005         break;
1006       }
1007     }
1008   }
1009   after = iterAfter->qname;
1010
1011   return true;
1012 }
1013
1014 bool Bind2Backend::getBeforeAndAfterNamesAbsolute(uint32_t id, const DNSName& qname, DNSName& unhashed, DNSName& before, DNSName& after)
1015 {
1016   BB2DomainInfo bbd;
1017   if (!safeGetBBDomainInfo(id, &bbd))
1018     return false;
1019
1020   NSEC3PARAMRecordContent ns3pr;
1021
1022   bool nsec3zone;
1023   if (d_hybrid) {
1024     DNSSECKeeper dk;
1025     nsec3zone=dk.getNSEC3PARAM(bbd.d_name, &ns3pr);
1026   } else
1027     nsec3zone=getNSEC3PARAM(bbd.d_name, &ns3pr);
1028
1029   if(!nsec3zone) {
1030     return findBeforeAndAfterUnhashed(bbd, qname, unhashed, before, after);
1031   }
1032   else {
1033     auto& hashindex=boost::multi_index::get<NSEC3Tag>(*bbd.d_records.getWRITABLE());
1034
1035     // for(auto iter = first; iter != hashindex.end(); iter++)
1036     //  cerr<<iter->nsec3hash<<endl;
1037
1038     auto first = hashindex.upper_bound("");
1039     auto iter = hashindex.upper_bound(qname.toStringNoDot());
1040
1041     if (iter == hashindex.end()) {
1042       --iter;
1043       before = DNSName(iter->nsec3hash);
1044       after = DNSName(first->nsec3hash);
1045     } else {
1046       after = DNSName(iter->nsec3hash);
1047       if (iter != first)
1048         --iter;
1049       else
1050         iter = --hashindex.end();
1051       before = DNSName(iter->nsec3hash);
1052     }
1053     unhashed = iter->qname+bbd.d_name;
1054
1055     return true;
1056   }
1057 }
1058
1059 void Bind2Backend::lookup(const QType &qtype, const DNSName &qname, int zoneId, DNSPacket *pkt_p )
1060 {
1061   d_handle.reset();
1062
1063   static bool mustlog=::arg().mustDo("query-logging");
1064
1065   bool found;
1066   DNSName domain;
1067   BB2DomainInfo bbd;
1068
1069   if(mustlog)
1070     g_log<<Logger::Warning<<"Lookup for '"<<qtype.getName()<<"' of '"<<qname<<"' within zoneID "<<zoneId<<endl;
1071
1072   if (zoneId >= 0) {
1073     if ((found = (safeGetBBDomainInfo(zoneId, &bbd) && qname.isPartOf(bbd.d_name)))) {
1074       domain = bbd.d_name;
1075     }
1076   } else {
1077     domain = qname;
1078     do {
1079       found = safeGetBBDomainInfo(domain, &bbd);
1080     } while (!found && qtype != QType::SOA && domain.chopOff());
1081   }
1082
1083   if(!found) {
1084     if(mustlog)
1085       g_log<<Logger::Warning<<"Found no authoritative zone for '"<<qname<<"' and/or id "<<bbd.d_id<<endl;
1086     d_handle.d_list=false;
1087     return;
1088   }
1089
1090   if(mustlog)
1091     g_log<<Logger::Warning<<"Found a zone '"<<domain<<"' (with id " << bbd.d_id<<") that might contain data "<<endl;
1092
1093   d_handle.id=bbd.d_id;
1094   d_handle.qname=qname.makeRelative(domain); // strip domain name
1095   d_handle.qtype=qtype;
1096   d_handle.domain=domain;
1097
1098   if(!bbd.d_loaded) {
1099     d_handle.reset();
1100     throw DBException("Zone for '"+bbd.d_name.toLogString()+"' in '"+bbd.d_filename+"' temporarily not available (file missing, or master dead)"); // fsck
1101   }
1102
1103   if(!bbd.current()) {
1104     g_log<<Logger::Warning<<"Zone '"<<bbd.d_name<<"' ("<<bbd.d_filename<<") needs reloading"<<endl;
1105     queueReloadAndStore(bbd.d_id);
1106     if (!safeGetBBDomainInfo(domain, &bbd))
1107       throw DBException("Zone '"+bbd.d_name.toLogString()+"' ("+bbd.d_filename+") gone after reload"); // if we don't throw here, we crash for some reason
1108   }
1109
1110   d_handle.d_records = bbd.d_records.get();
1111
1112   if(d_handle.d_records->empty())
1113     DLOG(g_log<<"Query with no results"<<endl);
1114
1115   d_handle.mustlog = mustlog;
1116
1117   auto& hashedidx = boost::multi_index::get<UnorderedNameTag>(*d_handle.d_records);
1118   auto range = hashedidx.equal_range(d_handle.qname);
1119
1120   if(range.first==range.second) {
1121     d_handle.d_list=false;
1122     d_handle.d_iter = d_handle.d_end_iter  = range.first;
1123     return;
1124   }
1125   else {
1126     d_handle.d_iter=range.first;
1127     d_handle.d_end_iter=range.second;
1128   }
1129
1130   d_handle.d_list=false;
1131 }
1132
1133 Bind2Backend::handle::handle()
1134 {
1135   mustlog=false;
1136 }
1137
1138 bool Bind2Backend::get(DNSResourceRecord &r)
1139 {
1140   if(!d_handle.d_records) {
1141     if(d_handle.mustlog)
1142       g_log<<Logger::Warning<<"There were no answers"<<endl;
1143     return false;
1144   }
1145
1146   if(!d_handle.get(r)) {
1147     if(d_handle.mustlog)
1148       g_log<<Logger::Warning<<"End of answers"<<endl;
1149
1150     d_handle.reset();
1151
1152     return false;
1153   }
1154   if(d_handle.mustlog)
1155     g_log<<Logger::Warning<<"Returning: '"<<r.qtype.getName()<<"' of '"<<r.qname<<"', content: '"<<r.content<<"'"<<endl;
1156   return true;
1157 }
1158
1159 bool Bind2Backend::handle::get(DNSResourceRecord &r)
1160 {
1161   if(d_list)
1162     return get_list(r);
1163   else
1164     return get_normal(r);
1165 }
1166
1167 void Bind2Backend::handle::reset()
1168 {
1169   d_records.reset();
1170   qname.clear();
1171   mustlog=false;
1172 }
1173
1174 //#define DLOG(x) x
1175 bool Bind2Backend::handle::get_normal(DNSResourceRecord &r)
1176 {
1177   DLOG(g_log << "Bind2Backend get() was called for "<<qtype.getName() << " record for '"<<
1178        qname<<"' - "<<d_records->size()<<" available in total!"<<endl);
1179
1180   if(d_iter==d_end_iter) {
1181     return false;
1182   }
1183
1184   while(d_iter!=d_end_iter && !(qtype.getCode()==QType::ANY || (d_iter)->qtype==qtype.getCode())) {
1185     DLOG(g_log<<Logger::Warning<<"Skipped "<<qname<<"/"<<QType(d_iter->qtype).getName()<<": '"<<d_iter->content<<"'"<<endl);
1186     d_iter++;
1187   }
1188   if(d_iter==d_end_iter) {
1189     return false;
1190   }
1191   DLOG(g_log << "Bind2Backend get() returning a rr with a "<<QType(d_iter->qtype).getCode()<<endl);
1192
1193   r.qname=qname.empty() ? domain : (qname+domain);
1194   r.domain_id=id;
1195   r.content=(d_iter)->content;
1196   //  r.domain_id=(d_iter)->domain_id;
1197   r.qtype=(d_iter)->qtype;
1198   r.ttl=(d_iter)->ttl;
1199
1200   //if(!d_iter->auth && r.qtype.getCode() != QType::A && r.qtype.getCode()!=QType::AAAA && r.qtype.getCode() != QType::NS)
1201   //  cerr<<"Warning! Unauth response for qtype "<< r.qtype.getName() << " for '"<<r.qname<<"'"<<endl;
1202   r.auth = d_iter->auth;
1203
1204   d_iter++;
1205
1206   return true;
1207 }
1208
1209 bool Bind2Backend::list(const DNSName& target, int id, bool include_disabled)
1210 {
1211   BB2DomainInfo bbd;
1212
1213   if(!safeGetBBDomainInfo(id, &bbd))
1214     return false;
1215
1216   d_handle.reset();
1217   DLOG(g_log<<"Bind2Backend constructing handle for list of "<<id<<endl);
1218
1219   d_handle.d_records=bbd.d_records.get(); // give it a copy, which will stay around
1220   d_handle.d_qname_iter= d_handle.d_records->begin();
1221   d_handle.d_qname_end=d_handle.d_records->end();   // iter now points to a vector of pointers to vector<BBResourceRecords>
1222
1223   d_handle.id=id;
1224   d_handle.domain=bbd.d_name;
1225   d_handle.d_list=true;
1226   return true;
1227 }
1228
1229 bool Bind2Backend::handle::get_list(DNSResourceRecord &r)
1230 {
1231   if(d_qname_iter!=d_qname_end) {
1232     r.qname=d_qname_iter->qname.empty() ? domain : (d_qname_iter->qname+domain);
1233     r.domain_id=id;
1234     r.content=(d_qname_iter)->content;
1235     r.qtype=(d_qname_iter)->qtype;
1236     r.ttl=(d_qname_iter)->ttl;
1237     r.auth = d_qname_iter->auth;
1238     d_qname_iter++;
1239     return true;
1240   }
1241   return false;
1242 }
1243
1244 bool Bind2Backend::superMasterBackend(const string &ip, const DNSName& domain, const vector<DNSResourceRecord>&nsset, string *nameserver, string *account, DNSBackend **db)
1245 {
1246   // Check whether we have a configfile available.
1247   if (getArg("supermaster-config").empty())
1248     return false;
1249
1250   ifstream c_if(getArg("supermasters").c_str(), std::ios::in); // this was nocreate?
1251   if (!c_if) {
1252     g_log << Logger::Error << "Unable to open supermasters file for read: " << stringerror() << endl;
1253     return false;
1254   }
1255
1256   // Format:
1257   // <ip> <accountname>
1258   string line, sip, saccount;
1259   while (getline(c_if, line)) {
1260     std::istringstream ii(line);
1261     ii >> sip;
1262     if (sip == ip) {
1263       ii >> saccount;
1264       break;
1265     }
1266   }
1267   c_if.close();
1268
1269   if (sip != ip)  // ip not found in authorization list - reject
1270     return false;
1271
1272   // ip authorized as supermaster - accept
1273   *db = this;
1274   if (saccount.length() > 0)
1275       *account = saccount.c_str();
1276
1277   return true;
1278 }
1279
1280 BB2DomainInfo Bind2Backend::createDomainEntry(const DNSName& domain, const string &filename)
1281 {
1282   int newid=1;
1283   {   // Find a free zone id nr.
1284     ReadLock rl(&s_state_lock);
1285     if (!s_state.empty()) {
1286       newid = s_state.rbegin()->d_id+1;
1287     }
1288   }
1289
1290   BB2DomainInfo bbd;
1291   bbd.d_kind = DomainInfo::Native;
1292   bbd.d_id = newid;
1293   bbd.d_records = shared_ptr<recordstorage_t >(new recordstorage_t);
1294   bbd.d_name = domain;
1295   bbd.setCheckInterval(getArgAsNum("check-interval"));
1296   bbd.d_filename = filename;
1297
1298   return bbd;
1299 }
1300
1301 bool Bind2Backend::createSlaveDomain(const string &ip, const DNSName& domain, const string &nameserver, const string &account)
1302 {
1303   string filename = getArg("supermaster-destdir")+'/'+domain.toStringNoDot();
1304
1305   g_log << Logger::Warning << d_logprefix
1306     << " Writing bind config zone statement for superslave zone '" << domain
1307     << "' from supermaster " << ip << endl;
1308
1309   {
1310     Lock l2(&s_supermaster_config_lock);
1311
1312     ofstream c_of(getArg("supermaster-config").c_str(),  std::ios::app);
1313     if (!c_of) {
1314       g_log << Logger::Error << "Unable to open supermaster configfile for append: " << stringerror() << endl;
1315       throw DBException("Unable to open supermaster configfile for append: "+stringerror());
1316     }
1317
1318     c_of << endl;
1319     c_of << "# Superslave zone '" << domain.toString() << "' (added: " << nowTime() << ") (account: " << account << ')' << endl;
1320     c_of << "zone \"" << domain.toStringNoDot() << "\" {" << endl;
1321     c_of << "\ttype slave;" << endl;
1322     c_of << "\tfile \"" << filename << "\";" << endl;
1323     c_of << "\tmasters { " << ip << "; };" << endl;
1324     c_of << "};" << endl;
1325     c_of.close();
1326   }
1327
1328   BB2DomainInfo bbd = createDomainEntry(domain, filename);
1329   bbd.d_kind = DomainInfo::Slave;
1330   bbd.d_masters.push_back(ComboAddress(ip, 53));
1331   bbd.setCtime();
1332   safePutBBDomainInfo(bbd);
1333   return true;
1334 }
1335
1336 bool Bind2Backend::searchRecords(const string &pattern, int maxResults, vector<DNSResourceRecord>& result)
1337 {
1338   SimpleMatch sm(pattern,true);
1339   static bool mustlog=::arg().mustDo("query-logging");
1340   if(mustlog)
1341     g_log<<Logger::Warning<<"Search for pattern '"<<pattern<<"'"<<endl;
1342
1343   {
1344     ReadLock rl(&s_state_lock);
1345
1346     for(state_t::const_iterator i = s_state.begin(); i != s_state.end() ; ++i) {
1347       BB2DomainInfo h;
1348       if (!safeGetBBDomainInfo(i->d_id, &h)) {
1349         continue;
1350       }
1351
1352       shared_ptr<const recordstorage_t> rhandle = h.d_records.get();
1353
1354       for(recordstorage_t::const_iterator ri = rhandle->begin(); result.size() < static_cast<vector<DNSResourceRecord>::size_type>(maxResults) && ri != rhandle->end(); ri++) {
1355         DNSName name = ri->qname.empty() ? i->d_name : (ri->qname+i->d_name);
1356         if (sm.match(name) || sm.match(ri->content)) {
1357           DNSResourceRecord r;
1358           r.qname=name;
1359           r.domain_id=i->d_id;
1360           r.content=ri->content;
1361           r.qtype=ri->qtype;
1362           r.ttl=ri->ttl;
1363           r.auth = ri->auth;
1364           result.push_back(r);
1365         }
1366       }
1367     }
1368   }
1369
1370   return true;
1371 }
1372
1373 class Bind2Factory : public BackendFactory
1374 {
1375    public:
1376       Bind2Factory() : BackendFactory("bind") {}
1377
1378       void declareArguments(const string &suffix="")
1379       {
1380          declare(suffix,"ignore-broken-records","Ignore records that are out-of-bound for the zone.","no");
1381          declare(suffix,"config","Location of named.conf","");
1382          declare(suffix,"check-interval","Interval for zonefile changes","0");
1383          declare(suffix,"supermaster-config","Location of (part of) named.conf where pdns can write zone-statements to","");
1384          declare(suffix,"supermasters","List of IP-addresses of supermasters","");
1385          declare(suffix,"supermaster-destdir","Destination directory for newly added slave zones",::arg()["config-dir"]);
1386          declare(suffix,"dnssec-db","Filename to store & access our DNSSEC metadatabase, empty for none", "");
1387          declare(suffix,"dnssec-db-journal-mode","SQLite3 journal mode", "WAL");
1388          declare(suffix,"hybrid","Store DNSSEC metadata in other backend","no");
1389       }
1390
1391       DNSBackend *make(const string &suffix="")
1392       {
1393          assertEmptySuffix(suffix);
1394          return new Bind2Backend(suffix);
1395       }
1396
1397       DNSBackend *makeMetadataOnly(const string &suffix="")
1398       {
1399         assertEmptySuffix(suffix);
1400         return new Bind2Backend(suffix, false);
1401       }
1402    private:
1403       void assertEmptySuffix(const string &suffix)
1404       {
1405         if(suffix.length())
1406           throw PDNSException("launch= suffixes are not supported on the bindbackend");
1407       }
1408 };
1409
1410 //! Magic class that is activated when the dynamic library is loaded
1411 class Bind2Loader
1412 {
1413 public:
1414   Bind2Loader()
1415   {
1416     BackendMakers().report(new Bind2Factory);
1417     g_log << Logger::Info << "[bind2backend] This is the bind backend version " << VERSION
1418 #ifndef REPRODUCIBLE
1419       << " (" __DATE__ " " __TIME__ ")"
1420 #endif
1421 #ifdef HAVE_SQLITE3
1422       << " (with bind-dnssec-db support)"
1423 #endif
1424       << " reporting" << endl;
1425   }
1426 };
1427 static Bind2Loader bind2loader;