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/*
* This file is part of PowerDNS or dnsdist.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#pragma once
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "iputils.hh"
#include "dnsname.hh"
#include "namespaces.hh"
#include "dnsrecords.hh"
#include "filterpo.hh"
#include "ednsoptions.hh"
#include "validate.hh"
#include "lua-base4.hh"
#include "proxy-protocol.hh"
#include <unordered_map>
#include "lua-recursor4-ffi.hh"
string GenUDPQueryResponse(const ComboAddress& dest, const string& query);
unsigned int getRecursorThreadId();
// pdns_ffi_param_t is a lightuserdata
template<>
struct LuaContext::Pusher<pdns_ffi_param*> {
static const int minSize = 1;
static const int maxSize = 1;
static PushedObject push(lua_State* state, pdns_ffi_param* ptr) noexcept {
lua_pushlightuserdata(state, ptr);
return PushedObject{state, 1};
}
};
class RecursorLua4 : public BaseLua4
{
public:
RecursorLua4();
~RecursorLua4(); // this is so unique_ptr works with an incomplete type
struct DNSQuestion
{
DNSQuestion(const ComboAddress& rem, const ComboAddress& loc, const DNSName& query, uint16_t type, bool tcp, bool& variable_, bool& wantsRPZ_, bool& logResponse_): qname(query), qtype(type), local(loc), remote(rem), isTcp(tcp), variable(variable_), wantsRPZ(wantsRPZ_), logResponse(logResponse_)
{
}
const DNSName& qname;
const uint16_t qtype;
const ComboAddress& local;
const ComboAddress& remote;
const struct dnsheader* dh{nullptr};
const bool isTcp;
const std::vector<pair<uint16_t, string>>* ednsOptions{nullptr};
const uint16_t* ednsFlags{nullptr};
vector<DNSRecord>* currentRecords{nullptr};
DNSFilterEngine::Policy* appliedPolicy{nullptr};
std::unordered_set<std::string>* policyTags{nullptr};
const std::vector<ProxyProtocolValue>* proxyProtocolValues{nullptr};
std::unordered_map<std::string, bool>* discardedPolicies{nullptr};
std::string requestorId;
std::string deviceId;
std::string deviceName;
vState validationState{vState::Indeterminate};
bool& variable;
bool& wantsRPZ;
bool& logResponse;
unsigned int tag{0};
void addAnswer(uint16_t type, const std::string& content, boost::optional<int> ttl, boost::optional<string> name);
void addRecord(uint16_t type, const std::string& content, DNSResourceRecord::Place place, boost::optional<int> ttl, boost::optional<string> name);
vector<pair<int,DNSRecord> > getRecords() const;
boost::optional<dnsheader> getDH() const;
vector<pair<uint16_t, string> > getEDNSOptions() const;
boost::optional<string> getEDNSOption(uint16_t code) const;
boost::optional<Netmask> getEDNSSubnet() const;
std::vector<std::pair<int, ProxyProtocolValue>> getProxyProtocolValues() const;
vector<string> getEDNSFlags() const;
bool getEDNSFlag(string flag) const;
void setRecords(const vector<pair<int,DNSRecord> >& records);
int rcode{0};
// struct dnsheader, packet length would be great
vector<DNSRecord> records;
string followupFunction;
string followupPrefix;
string udpQuery;
ComboAddress udpQueryDest;
string udpAnswer;
string udpCallback;
LuaContext::LuaObject data;
DNSName followupName;
};
struct PolicyEvent
{
PolicyEvent(const ComboAddress& rem, const DNSName& name, const QType& type, bool tcp): qname(name), qtype(type), remote(rem), isTcp(tcp)
{
}
const DNSName& qname;
const QType qtype;
const ComboAddress& remote;
const bool isTcp;
DNSFilterEngine::Policy* appliedPolicy{nullptr};
std::unordered_set<std::string>* policyTags{nullptr};
std::unordered_map<std::string, bool>* discardedPolicies{nullptr};
};
unsigned int gettag(const ComboAddress& remote, const Netmask& ednssubnet, const ComboAddress& local, const DNSName& qname, uint16_t qtype, std::unordered_set<std::string>* policyTags, LuaContext::LuaObject& data, const EDNSOptionViewMap&, bool tcp, std::string& requestorId, std::string& deviceId, std::string& deviceName, std::string& routingTag, const std::vector<ProxyProtocolValue>& proxyProtocolValues) const;
unsigned int gettag_ffi(const ComboAddress& remote, const Netmask& ednssubnet, const ComboAddress& local, const DNSName& qname, uint16_t qtype, std::unordered_set<std::string>* policyTags, std::vector<DNSRecord>& records, LuaContext::LuaObject& data, const EDNSOptionViewMap& ednsOptions, bool tcp, const std::vector<ProxyProtocolValue>& proxyProtocolValues, std::string& requestorId, std::string& deviceId, std::string& deviceName, std::string& routingTag, boost::optional<int>& rcode, uint32_t& ttlCap, bool& variable, bool& logQuery, bool& logResponse, bool& followCNAMERecords) const;
void maintenance() const;
bool prerpz(DNSQuestion& dq, int& ret) const;
bool preresolve(DNSQuestion& dq, int& ret) const;
bool nxdomain(DNSQuestion& dq, int& ret) const;
bool nodata(DNSQuestion& dq, int& ret) const ;
bool postresolve(DNSQuestion& dq, int& ret) const;
bool preoutquery(const ComboAddress& ns, const ComboAddress& requestor, const DNSName& query, const QType& qtype, bool isTcp, vector<DNSRecord>& res, int& ret) const;
bool ipfilter(const ComboAddress& remote, const ComboAddress& local, const struct dnsheader&) const;
bool policyHitEventFilter(const ComboAddress& remote, const DNSName& qname, const QType& qtype, bool tcp, DNSFilterEngine::Policy& policy, std::unordered_set<std::string>& tags, std::unordered_map<std::string, bool>& dicardedPolicies) const;
bool needDQ() const
{
return (d_prerpz ||
d_preresolve ||
d_nxdomain ||
d_nodata ||
d_postresolve);
}
typedef std::function<std::tuple<unsigned int,boost::optional<std::unordered_map<int, string> >,boost::optional<LuaContext::LuaObject>,boost::optional<std::string>,boost::optional<std::string>,boost::optional<std::string>,boost::optional<string> >(ComboAddress, Netmask, ComboAddress, DNSName, uint16_t, const EDNSOptionViewMap&, bool, const std::vector<std::pair<int, const ProxyProtocolValue*>>&)> gettag_t;
gettag_t d_gettag; // public so you can query if we have this hooked
typedef std::function<boost::optional<LuaContext::LuaObject>(pdns_ffi_param_t*)> gettag_ffi_t;
gettag_ffi_t d_gettag_ffi;
protected:
virtual void postPrepareContext() override;
virtual void postLoad() override;
virtual void getFeatures(Features& features) override;
private:
typedef std::function<void()> luamaintenance_t;
luamaintenance_t d_maintenance;
typedef std::function<bool(DNSQuestion*)> luacall_t;
luacall_t d_prerpz, d_preresolve, d_nxdomain, d_nodata, d_postresolve, d_preoutquery, d_postoutquery;
bool genhook(const luacall_t& func, DNSQuestion& dq, int& ret) const;
typedef std::function<bool(ComboAddress,ComboAddress, struct dnsheader)> ipfilter_t;
ipfilter_t d_ipfilter;
typedef std::function<bool(PolicyEvent&)> policyEventFilter_t;
policyEventFilter_t d_policyHitEventFilter;
};
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