pdns/packethandler.hh

   1 /*
   2     PowerDNS Versatile Database Driven Nameserver
   3     Copyright (C) 2002  PowerDNS.COM BV
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program; if not, write to the Free Software
  17     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18 */
  19 #ifndef PACKETHANDLER_HH
  20 #define PACKETHANDLER_HH
  21
  22 #ifndef WIN32
  23 # include <sys/socket.h>
  24 # include <netinet/in.h>
  25 # include <arpa/inet.h>
  26 #endif // WIN32
  27
  28 #include "ueberbackend.hh"
  29 #include "dnspacket.hh"
  30 #include "packetcache.hh"
  31
  32 using namespace std;
  33
  34 /** Central DNS logic according to RFC1034. Ask this class a question in the form of a DNSPacket
  35     and it will return, synchronously, a DNSPacket answer, suitable for
  36     sending out over the network.
  37
  38     The PacketHandler gives your question to the PacketCache for possible inclusion
  39     in the cache.
  40
  41     In order to do so, the PacketHandler contains a reference to the global extern PacketCache PC
  42
  43     It also contains an UeberBackend instance for answering the subqueries needed to generate
  44     a complete reply.
  45
  46 */
  47
  48 class PacketHandler
  49 {
  50 public:
  51   template<class T> class Guard
  52   {
  53   public:
  54     Guard(T **guard)
  55     {
  56       d_guard=guard;
  57     }
  58
  59     ~Guard()
  60     {
  61       if(*d_guard)
  62         delete *d_guard;
  63     }
  64
  65   private:
  66     T **d_guard;
  67   };
  68
  69
  70   DNSPacket *question(DNSPacket *); //!< hand us a DNS packet with a question, we give you an answer
  71   PacketHandler();
  72   ~PacketHandler(); // defined in packethandler.cc, and does --count
  73   static int numRunning(){return s_count;}; //!< Returns the number of running PacketHandlers
  74
  75   void soaMagic(DNSResourceRecord *rr);
  76   DNSBackend *getBackend();
  77   class DBException{};
  78
  79 private:
  80   int doNotify(DNSPacket *);
  81   int PacketHandler::trySuperMaster(DNSPacket *p);
  82   int makeCanonic(DNSPacket *p, DNSPacket *r, string &target);
  83   int doWildcardRecords(DNSPacket *p, DNSPacket *r, string &target);
  84   int findMboxFW(DNSPacket *p, DNSPacket *r, string &target);
  85   int findUrl(DNSPacket *p, DNSPacket *r, string &target);
  86   int doFancyRecords(DNSPacket *p, DNSPacket *r, string &target);
  87   int doDNSCheckRequest(DNSPacket *p, DNSPacket *r, string &target);
  88   int doVersionRequest(DNSPacket *p, DNSPacket *r, string &target);
  89   bool getAuth(DNSPacket *p, SOAData *sd, const string &target, int *zoneId);
  90   bool getTLDAuth(DNSPacket *p, SOAData *sd, const string &target, int *zoneId);
  91   int doAdditionalProcessing(DNSPacket *p, DNSPacket *r, bool &dangling);
  92
  93
  94   static int s_count;
  95   bool d_doFancyRecords;
  96   bool d_doRecursion;
  97   bool d_doLazyRecursion;
  98   bool d_doWildcards;
  99   bool d_doCNAME;
 100   bool d_logDNSDetails;
 101
 102   UeberBackend B; // every thread an own instance
 103 };
 104
 105 #endif /* PACKETHANDLER */