pdns/packethandler.hh

   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 #ifndef PACKETHANDLER_HH
  23 #define PACKETHANDLER_HH
  24
  25 #include <sys/socket.h>
  26 #include <netinet/in.h>
  27 #include <arpa/inet.h>
  28 #include "ueberbackend.hh"
  29 #include "dnspacket.hh"
  30 #include "packetcache.hh"
  31 #include "dnsseckeeper.hh"
  32 #include "lua-auth.hh"
  33 #include "lua-auth4.hh"
  34 #include "gss_context.hh"
  35
  36 #include "namespaces.hh"
  37
  38 // silly Solaris people define PC
  39 #undef PC
  40
  41 /** Central DNS logic according to RFC1034. Ask this class a question in the form of a DNSPacket
  42     and it will return, synchronously, a DNSPacket answer, suitable for
  43     sending out over the network.
  44
  45     The PacketHandler gives your question to the PacketCache for possible inclusion
  46     in the cache.
  47
  48     In order to do so, the PacketHandler contains a reference to the global extern PacketCache PC
  49
  50     It also contains an UeberBackend instance for answering the subqueries needed to generate
  51     a complete reply.
  52
  53 */
  54 class NSEC3PARAMRecordContent;
  55
  56 class PacketHandler
  57 {
  58 public:
  59   DNSPacket *doQuestion(DNSPacket *); //!< hand us a DNS packet with a question, we give you an answer
  60   DNSPacket *question(DNSPacket *); //!< hand us a DNS packet with a question, we give you an answer
  61   PacketHandler();
  62   ~PacketHandler(); // defined in packethandler.cc, and does --count
  63   static int numRunning(){return s_count;}; //!< Returns the number of running PacketHandlers. Called by Distributor
  64
  65   UeberBackend *getBackend();
  66
  67   int trySuperMasterSynchronous(DNSPacket *p, const DNSName& tsigkeyname);
  68   static NetmaskGroup s_allowNotifyFrom;
  69   static set<string> s_forwardNotify;
  70
  71 private:
  72   int trySuperMaster(DNSPacket *p, const DNSName& tsigkeyname);
  73   int processNotify(DNSPacket *);
  74   void addRootReferral(DNSPacket *r);
  75   int doChaosRequest(DNSPacket *p, DNSPacket *r, DNSName &target);
  76   bool addDNSKEY(DNSPacket *p, DNSPacket *r, const SOAData& sd);
  77   bool addCDNSKEY(DNSPacket *p, DNSPacket *r, const SOAData& sd);
  78   bool addCDS(DNSPacket *p, DNSPacket *r, const SOAData& sd);
  79   bool addNSEC3PARAM(DNSPacket *p, DNSPacket *r, const SOAData& sd);
  80   int doAdditionalProcessingAndDropAA(DNSPacket *p, DNSPacket *r, const SOAData& sd, bool retargeted);
  81   void addNSECX(DNSPacket *p, DNSPacket* r, const DNSName &target, const DNSName &wildcard, const DNSName &auth, int mode);
  82   void addNSEC(DNSPacket *p, DNSPacket* r, const DNSName &target, const DNSName &wildcard, const DNSName& auth, int mode);
  83   void addNSEC3(DNSPacket *p, DNSPacket* r, const DNSName &target, const DNSName &wildcard, const DNSName& auth, const NSEC3PARAMRecordContent& nsec3param, bool narrow, int mode);
  84   void emitNSEC(DNSPacket *r, const SOAData& sd, const DNSName& name, const DNSName& next, int mode);
  85   void emitNSEC3(DNSPacket *r, const SOAData& sd, const NSEC3PARAMRecordContent &ns3rc, const DNSName& unhashed, const string& begin, const string& end, int mode);
  86   int processUpdate(DNSPacket *p);
  87   int forwardPacket(const string &msgPrefix, DNSPacket *p, DomainInfo *di);
  88   uint performUpdate(const string &msgPrefix, const DNSRecord *rr, DomainInfo *di, bool isPresigned, bool* narrow, bool* haveNSEC3, NSEC3PARAMRecordContent *ns3pr, bool *updatedSerial);
  89   int checkUpdatePrescan(const DNSRecord *rr);
  90   int checkUpdatePrerequisites(const DNSRecord *rr, DomainInfo *di);
  91   void increaseSerial(const string &msgPrefix, const DomainInfo *di, bool haveNSEC3, bool narrow, const NSEC3PARAMRecordContent *ns3pr);
  92
  93   void makeNXDomain(DNSPacket* p, DNSPacket* r, const DNSName& target, const DNSName& wildcard, SOAData& sd);
  94   void makeNOError(DNSPacket* p, DNSPacket* r, const DNSName& target, const DNSName& wildcard, SOAData& sd, int mode);
  95   vector<DNSZoneRecord> getBestReferralNS(DNSPacket *p, SOAData& sd, const DNSName &target);
  96   vector<DNSZoneRecord> getBestDNAMESynth(DNSPacket *p, SOAData& sd, DNSName &target);
  97   bool tryDNAME(DNSPacket *p, DNSPacket*r, SOAData& sd, DNSName &target);
  98   bool tryReferral(DNSPacket *p, DNSPacket*r, SOAData& sd, const DNSName &target, bool retargeted);
  99
 100   bool getBestWildcard(DNSPacket *p, SOAData& sd, const DNSName &target, DNSName &wildcard, vector<DNSZoneRecord>* ret);
 101   bool tryWildcard(DNSPacket *p, DNSPacket*r, SOAData& sd, DNSName &target, DNSName &wildcard, bool& retargeted, bool& nodata);
 102   bool addDSforNS(DNSPacket* p, DNSPacket* r, SOAData& sd, const DNSName& dsname);
 103   void completeANYRecords(DNSPacket *p, DNSPacket*r, SOAData& sd, const DNSName &target);
 104
 105   void tkeyHandler(DNSPacket *p, DNSPacket *r); //<! process TKEY record, and adds TKEY record to (r)eply, or error code.
 106
 107   static AtomicCounter s_count;
 108   static pthread_mutex_t s_rfc2136lock;
 109   bool d_logDNSDetails;
 110   bool d_doIPv6AdditionalProcessing;
 111   bool d_doDNAME;
 112   bool d_doExpandALIAS;
 113   std::unique_ptr<AuthLua> d_pdl;
 114   std::unique_ptr<AuthLua4> d_update_policy_lua;
 115
 116   UeberBackend B; // every thread an own instance
 117   DNSSECKeeper d_dk; // B is shared with DNSSECKeeper
 118 };
 119 bool getNSEC3Hashes(bool narrow, DNSBackend* db, int id, const std::string& hashed, bool decrement, DNSName& unhashed, string& before, string& after, int mode=0);
 120 std::shared_ptr<DNSRecordContent> makeSOAContent(const SOAData& sd);
 121 #endif /* PACKETHANDLER */