pdns/resolver.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_RESOLVER_HH
  23 #define PDNS_RESOLVER_HH
  24
  25 #include <string>
  26 #include <vector>
  27 #include <sys/types.h>
  28 #include "iputils.hh"
  29 #include <netdb.h>
  30 #include <unistd.h>
  31 #include <sys/time.h>
  32 #include <sys/uio.h>
  33 #include <fcntl.h>
  34 #include <sys/socket.h>
  35 #include <netinet/in.h>
  36 #include <arpa/inet.h>
  37 #undef res_mkquery
  38
  39 #include "pdnsexception.hh"
  40 #include "dns.hh"
  41 #include "namespaces.hh"
  42 #include "dnsrecords.hh"
  43 #include "dnssecinfra.hh"
  44 #include "tsigverifier.hh"
  45
  46 class ResolverException : public PDNSException
  47 {
  48 public:
  49   ResolverException(const string &reason_) : PDNSException(reason_){}
  50 };
  51
  52 // make an IPv4 or IPv6 query socket
  53 int makeQuerySocket(const ComboAddress& local, bool udpOrTCP, bool nonLocalBind=false);
  54 //! Resolver class. Can be used synchronously and asynchronously, over IPv4 and over IPv6 (simultaneously)
  55 class Resolver  : public boost::noncopyable
  56 {
  57 public:
  58   Resolver();
  59   ~Resolver();
  60
  61   typedef vector<DNSResourceRecord> res_t;
  62   //! synchronously resolve domain|type at IP, store result in result, rcode in ret
  63   int resolve(const ComboAddress &ip, const DNSName &domain, int type, res_t* result, const ComboAddress& local);
  64
  65   int resolve(const ComboAddress &ip, const DNSName &domain, int type, res_t* result);
  66
  67   //! only send out a resolution request
  68   uint16_t sendResolve(const ComboAddress& remote, const ComboAddress& local, const DNSName &domain, int type, int *localsock, bool dnssecOk=false,
  69     const DNSName& tsigkeyname=DNSName(), const DNSName& tsigalgorithm=DNSName(), const string& tsigsecret="");
  70
  71   //! see if we got a SOA response from our sendResolve
  72   bool tryGetSOASerial(DNSName *theirDomain, ComboAddress* remote, uint32_t* theirSerial, uint32_t* theirInception, uint32_t* theirExpire, uint16_t* id);
  73
  74   //! convenience function that calls resolve above
  75   void getSoaSerial(const ComboAddress&, const DNSName &, uint32_t *);
  76
  77 private:
  78   std::map<std::string, int> locals;
  79 };
  80
  81 class AXFRRetriever : public boost::noncopyable
  82 {
  83   public:
  84     AXFRRetriever(const ComboAddress& remote,
  85                   const DNSName& zone,
  86                   const TSIGTriplet& tt = TSIGTriplet(),
  87                   const ComboAddress* laddr = NULL,
  88                   size_t maxReceivedBytes=0,
  89                   uint16_t timeout=10);
  90     ~AXFRRetriever();
  91     int getChunk(Resolver::res_t &res, vector<DNSRecord>* records=0, uint16_t timeout=10);
  92
  93   private:
  94     void connect(uint16_t timeout);
  95     int getLength(uint16_t timeout);
  96     void timeoutReadn(uint16_t bytes, uint16_t timeoutsec=10);
  97
  98     shared_array<char> d_buf;
  99     string d_domain;
 100     int d_sock;
 101     int d_soacount;
 102     ComboAddress d_remote;
 103     TSIGTCPVerifier d_tsigVerifier;
 104
 105     size_t d_receivedBytes;
 106     size_t d_maxReceivedBytes;
 107     TSIGRecordContent d_trc;
 108 };
 109
 110
 111 #endif /* PDNS_RESOLVER_HH */