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