pdns/tcpreceiver.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 PDNS_TCPRECEIVER_HH
  23 #define PDNS_TCPRECEIVER_HH
  24
  25 #include "dns.hh"
  26 #include "iputils.hh"
  27 #include "dnsbackend.hh"
  28 #include "packethandler.hh"
  29 #include <vector>
  30 #include <mutex>
  31 #include <poll.h>
  32 #include <sys/select.h>
  33 #include <sys/socket.h>
  34 #include <netinet/in.h>
  35 #include <arpa/inet.h>
  36 #include <sys/stat.h>
  37 #include <unistd.h>
  38 #include <netdb.h>
  39 #include <sys/uio.h>
  40 #include <sys/select.h>
  41
  42 #include "namespaces.hh"
  43
  44 class TCPNameserver
  45 {
  46 public:
  47   TCPNameserver();
  48   ~TCPNameserver();
  49   void go();
  50 private:
  51
  52   static void sendPacket(std::shared_ptr<DNSPacket> p, int outsock);
  53   static int readLength(int fd, ComboAddress *remote);
  54   static void getQuestion(int fd, char *mesg, int pktlen, const ComboAddress& remote, unsigned int totalTime);
  55   static int doAXFR(const DNSName &target, std::shared_ptr<DNSPacket> q, int outsock);
  56   static int doIXFR(std::shared_ptr<DNSPacket> q, int outsock);
  57   static bool canDoAXFR(std::shared_ptr<DNSPacket> q);
  58   static void *doConnection(void *data);
  59   static void *launcher(void *data);
  60   static void decrementClientCount(const ComboAddress& remote);
  61   void thread(void);
  62   static pthread_mutex_t s_plock;
  63   static std::mutex s_clientsCountMutex;
  64   static std::map<ComboAddress,size_t,ComboAddress::addressOnlyLessThan> s_clientsCount;
  65   static PacketHandler *s_P;
  66   pthread_t d_tid;
  67   static Semaphore *d_connectionroom_sem;
  68   static NetmaskGroup d_ng;
  69   static size_t d_maxTransactionsPerConn;
  70   static size_t d_maxConnectionsPerClient;
  71   static unsigned int d_idleTimeout;
  72   static unsigned int d_maxConnectionDuration;
  73
  74   vector<int>d_sockets;
  75   vector<struct pollfd> d_prfds;
  76 };
  77
  78 #endif /* PDNS_TCPRECEIVER_HH */