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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 "noinitvector.hh"
#include "rec-eventtrace.hh"
#include <unordered_map>
#include "lua-recursor4-ffi.hh"
// 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};
}
};
// pdns_postresolve_ffi_handle is a lightuserdata
template <>
struct LuaContext::Pusher<pdns_postresolve_ffi_handle*>
{
static const int minSize = 1;
static const int maxSize = 1;
static PushedObject push(lua_State* state, pdns_postresolve_ffi_handle* 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 MetaValue
{
std::unordered_set<std::string> stringVal;
std::unordered_set<int64_t> intVal;
};
struct DNSQuestion
{
DNSQuestion(const ComboAddress& rem, const ComboAddress& loc, const DNSName& query, uint16_t type, bool tcp, bool& variable_, bool& wantsRPZ_, bool& logResponse_, bool& addPaddingToResponse_, const struct timeval& queryTime_) :
qname(query), qtype(type), local(loc), remote(rem), isTcp(tcp), variable(variable_), wantsRPZ(wantsRPZ_), logResponse(logResponse_), addPaddingToResponse(addPaddingToResponse_), queryTime(queryTime_)
{
}
const DNSName& qname;
const uint16_t qtype;
const ComboAddress& local;
const ComboAddress& remote;
const ComboAddress* fromAuthIP{nullptr};
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* extendedErrorExtra{nullptr};
boost::optional<uint16_t>* extendedErrorCode{nullptr};
std::string requestorId;
std::string deviceId;
std::string deviceName;
vState validationState{vState::Indeterminate};
bool& variable;
bool& wantsRPZ;
bool& logResponse;
bool& addPaddingToResponse;
unsigned int tag{0};
std::map<std::string, MetaValue> meta;
struct timeval queryTime;
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};
};
struct FFIParams
{
public:
FFIParams(const DNSName& qname_, uint16_t qtype_, const ComboAddress& local_, const ComboAddress& remote_, const Netmask& ednssubnet_, LuaContext::LuaObject& data_, std::unordered_set<std::string>& policyTags_, std::vector<DNSRecord>& records_, const EDNSOptionViewMap& ednsOptions_, 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 tcp_, bool& logQuery_, bool& logResponse_, bool& followCNAMERecords_, boost::optional<uint16_t>& extendedErrorCode_, std::string& extendedErrorExtra_, bool& disablePadding_, std::map<std::string, MetaValue>& meta_) :
data(data_), qname(qname_), local(local_), remote(remote_), ednssubnet(ednssubnet_), policyTags(policyTags_), records(records_), ednsOptions(ednsOptions_), proxyProtocolValues(proxyProtocolValues_), requestorId(requestorId_), deviceId(deviceId_), deviceName(deviceName_), routingTag(routingTag_), extendedErrorExtra(extendedErrorExtra_), rcode(rcode_), extendedErrorCode(extendedErrorCode_), ttlCap(ttlCap_), variable(variable_), logQuery(logQuery_), logResponse(logResponse_), followCNAMERecords(followCNAMERecords_), disablePadding(disablePadding_), qtype(qtype_), tcp(tcp_), meta(meta_)
{
}
LuaContext::LuaObject& data;
const DNSName& qname;
const ComboAddress& local;
const ComboAddress& remote;
const Netmask& ednssubnet;
std::unordered_set<std::string>& policyTags;
std::vector<DNSRecord>& records;
const EDNSOptionViewMap& ednsOptions;
const std::vector<ProxyProtocolValue>& proxyProtocolValues;
std::string& requestorId;
std::string& deviceId;
std::string& deviceName;
std::string& routingTag;
std::string& extendedErrorExtra;
boost::optional<int>& rcode;
boost::optional<uint16_t>& extendedErrorCode;
uint32_t& ttlCap;
bool& variable;
bool& logQuery;
bool& logResponse;
bool& followCNAMERecords;
bool& disablePadding;
unsigned int tag{0};
uint16_t qtype;
bool tcp;
std::map<std::string, MetaValue>& meta;
};
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(FFIParams&) const;
void maintenance() const;
bool prerpz(DNSQuestion& dq, int& ret, RecEventTrace&) const;
bool preresolve(DNSQuestion& dq, int& ret, RecEventTrace&) const;
bool nxdomain(DNSQuestion& dq, int& ret, RecEventTrace&) const;
bool nodata(DNSQuestion& dq, int& ret, RecEventTrace&) const;
bool postresolve(DNSQuestion& dq, int& ret, RecEventTrace&) const;
bool preoutquery(const ComboAddress& ns, const ComboAddress& requestor, const DNSName& query, const QType& qtype, bool isTcp, vector<DNSRecord>& res, int& ret, RecEventTrace& et, const struct timeval& tv) const;
bool ipfilter(const ComboAddress& remote, const ComboAddress& local, const struct dnsheader&, RecEventTrace&) 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>& discardedPolicies) 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;
struct PostResolveFFIHandle
{
PostResolveFFIHandle(DNSQuestion& dq) :
d_dq(dq)
{
}
DNSQuestion& d_dq;
bool d_ret{false};
};
bool postresolve_ffi(PostResolveFFIHandle&) const;
typedef std::function<bool(pdns_postresolve_ffi_handle_t*)> postresolve_ffi_t;
postresolve_ffi_t d_postresolve_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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