modules/pipebackend/pipebackend.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 PIPEBACKEND_HH
  23 #define PIPEBACKEND_HH
  24
  25 #include <string>
  26 #include <map>
  27 #include <sys/types.h>
  28
  29
  30 #include "pdns/namespaces.hh"
  31 #include "pdns/misc.hh"
  32
  33
  34 /** The CoWrapper class wraps around a coprocess and restarts it if needed.
  35     It may also send out pings and expect banners */
  36 class CoWrapper
  37 {
  38 public:
  39   CoWrapper(const string &command, int timeout, int abiVersion);
  40   ~CoWrapper();
  41   void send(const string &line);
  42   void receive(string &line);
  43 private:
  44   CoRemote* d_cp;
  45   string d_command;
  46   void launch();
  47   int d_timeout;
  48   int d_abiVersion;
  49 };
  50
  51 class PipeBackend : public DNSBackend
  52 {
  53 public:
  54   PipeBackend(const string &suffix="");
  55   ~PipeBackend();
  56   void lookup(const QType&, const DNSName& qdomain, DNSPacket *p=0, int zoneId=-1) override;
  57   bool list(const DNSName& target, int domain_id, bool include_disabled=false) override;
  58   bool get(DNSResourceRecord &r) override;
  59   string directBackendCmd(const string &query) override;
  60   static DNSBackend *maker();
  61
  62 private:
  63   void launch();
  64   void cleanup();
  65   unique_ptr<CoWrapper> d_coproc;
  66   DNSName d_qname;
  67   QType d_qtype;
  68   Regex* d_regex;
  69   string d_regexstr;
  70   bool d_disavow;
  71   int d_abiVersion;
  72 };
  73
  74
  75 #endif
  76