pdns/dnsdist-lua.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 #pragma once
  23
  24 class LuaAction : public DNSAction
  25 {
  26 public:
  27   typedef std::function<std::tuple<int, string>(DNSQuestion* dq)> func_t;
  28   LuaAction(LuaAction::func_t func) : d_func(func)
  29   {}
  30
  31   Action operator()(DNSQuestion* dq, string* ruleresult) const override
  32   {
  33     std::lock_guard<std::mutex> lock(g_luamutex);
  34     auto ret = d_func(dq);
  35     if(ruleresult)
  36       *ruleresult=std::get<1>(ret);
  37     return (Action)std::get<0>(ret);
  38   }
  39
  40   string toString() const override
  41   {
  42     return "Lua script";
  43   }
  44
  45 private:
  46   func_t d_func;
  47 };
  48
  49 class LuaResponseAction : public DNSResponseAction
  50 {
  51 public:
  52   typedef std::function<std::tuple<int, string>(DNSResponse* dr)> func_t;
  53   LuaResponseAction(LuaResponseAction::func_t func) : d_func(func)
  54   {}
  55
  56   Action operator()(DNSResponse* dr, string* ruleresult) const override
  57   {
  58     std::lock_guard<std::mutex> lock(g_luamutex);
  59     auto ret = d_func(dr);
  60     if(ruleresult)
  61       *ruleresult=std::get<1>(ret);
  62     return (Action)std::get<0>(ret);
  63   }
  64
  65   string toString() const override
  66   {
  67     return "Lua response script";
  68   }
  69
  70 private:
  71   func_t d_func;
  72 };
  73
  74 class SpoofAction : public DNSAction
  75 {
  76 public:
  77   SpoofAction(const vector<ComboAddress>& addrs): d_addrs(addrs)
  78   {
  79   }
  80   SpoofAction(const string& cname): d_cname(cname)
  81   {
  82   }
  83   DNSAction::Action operator()(DNSQuestion* dq, string* ruleresult) const override;
  84   string toString() const override
  85   {
  86     string ret = "spoof in ";
  87     if(!d_cname.empty()) {
  88       ret+=d_cname.toString()+ " ";
  89     } else {
  90       for(const auto& a : d_addrs)
  91         ret += a.toString()+" ";
  92     }
  93     return ret;
  94   }
  95 private:
  96   std::vector<ComboAddress> d_addrs;
  97   DNSName d_cname;
  98 };
  99
 100 typedef boost::variant<string, vector<pair<int, string>>, std::shared_ptr<DNSRule>, DNSName, vector<pair<int, DNSName> > > luadnsrule_t;
 101 std::shared_ptr<DNSRule> makeRule(const luadnsrule_t& var);
 102
 103 typedef NetmaskTree<DynBlock> nmts_t;
 104
 105 void setupLuaActions();
 106 void setupLuaBindings(bool client);
 107 void setupLuaBindingsDNSQuestion();
 108 void setupLuaRules();
 109 void setupLuaInspection();
 110 void setupLuaVars();