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 version 2
   7     as published by the Free Software Foundation
   8
   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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  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 // silly Solaris people define PC
  35 #undef PC
  36
  37 /** Central DNS logic according to RFC1034. Ask this class a question in the form of a DNSPacket
  38     and it will return, synchronously, a DNSPacket answer, suitable for
  39     sending out over the network.
  40
  41     The PacketHandler gives your question to the PacketCache for possible inclusion
  42     in the cache.
  43
  44     In order to do so, the PacketHandler contains a reference to the global extern PacketCache PC
  45
  46     It also contains an UeberBackend instance for answering the subqueries needed to generate
  47     a complete reply.
  48
  49 */
  50
  51 class PacketHandler
  52 {
  53 public:
  54   template<class T> class Guard
  55   {
  56   public:
  57     Guard(T **guard)
  58     {
  59       d_guard=guard;
  60     }
  61
  62     ~Guard()
  63     {
  64       if(*d_guard)
  65         delete *d_guard;
  66     }
  67
  68   private:
  69     T **d_guard;
  70   };
  71
  72   DNSPacket *questionOrRecurse(DNSPacket *, bool* shouldRecurse); //!< hand us a DNS packet with a question, we'll tell you answer, or that you should recurse
  73   DNSPacket *question(DNSPacket *); //!< hand us a DNS packet with a question, we give you an answer
  74   PacketHandler();
  75   ~PacketHandler(); // defined in packethandler.cc, and does --count
  76   static int numRunning(){return s_count;}; //!< Returns the number of running PacketHandlers. Called by Distributor
  77
  78   void soaMagic(DNSResourceRecord *rr);
  79   DNSBackend *getBackend();
  80
  81
  82 private:
  83   int processNotify(DNSPacket *);
  84   void addRootReferral(DNSPacket *r);
  85   int trySuperMaster(DNSPacket *p);
  86   int makeCanonic(DNSPacket *p, DNSPacket *r, string &target);
  87   int doWildcardRecords(DNSPacket *p, DNSPacket *r, string &target);
  88   int findMboxFW(DNSPacket *p, DNSPacket *r, string &target);
  89   int findUrl(DNSPacket *p, DNSPacket *r, string &target);
  90   int doFancyRecords(DNSPacket *p, DNSPacket *r, string &target);
  91   int doDNSCheckRequest(DNSPacket *p, DNSPacket *r, string &target);
  92   int doVersionRequest(DNSPacket *p, DNSPacket *r, string &target);
  93   bool getAuth(DNSPacket *p, SOAData *sd, const string &target, int *zoneId);
  94   bool getTLDAuth(DNSPacket *p, SOAData *sd, const string &target, int *zoneId);
  95   int doAdditionalProcessingAndDropAA(DNSPacket *p, DNSPacket *r);
  96
  97   static int s_count;
  98   bool d_doFancyRecords;
  99   bool d_doRecursion;
 100   bool d_doWildcards;
 101   bool d_doCNAME;
 102   bool d_logDNSDetails;
 103   bool d_doIPv6AdditionalProcessing;
 104
 105   UeberBackend B; // every thread an own instance
 106 };
 107
 108 #endif /* PACKETHANDLER */