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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
#ifdef HAVE_PROTOBUF
#include <boost/uuid/uuid.hpp>
#include <boost/uuid/uuid_generators.hpp>
#endif
#include <string>
#include <atomic>
#include "utility.hh"
#include "dns.hh"
#include "qtype.hh"
#include <vector>
#include <set>
#include <unordered_set>
#include <map>
#include <cmath>
#include <iostream>
#include <utility>
#include "misc.hh"
#include "lwres.hh"
#include <boost/optional.hpp>
#include <boost/circular_buffer.hpp>
#include <boost/utility.hpp>
#include "sstuff.hh"
#include "recursor_cache.hh"
#include "recpacketcache.hh"
#include <boost/tuple/tuple.hpp>
#include <boost/optional.hpp>
#include <boost/tuple/tuple_comparison.hpp>
#include "mtasker.hh"
#include "iputils.hh"
#include "validate.hh"
#include "ednssubnet.hh"
#include "filterpo.hh"
#include "negcache.hh"
class RecursorLua4;
typedef map<
DNSName,
pair<
vector<ComboAddress>,
bool
>
> NsSet;
template<class Thing> class Throttle : public boost::noncopyable
{
public:
Throttle()
{
d_limit=3;
d_ttl=60;
d_last_clean=time(0);
}
bool shouldThrottle(time_t now, const Thing& t)
{
if(now > d_last_clean + 300 ) {
d_last_clean=now;
for(typename cont_t::iterator i=d_cont.begin();i!=d_cont.end();) {
if( i->second.ttd < now) {
d_cont.erase(i++);
}
else
++i;
}
}
typename cont_t::iterator i=d_cont.find(t);
if(i==d_cont.end())
return false;
if(now > i->second.ttd || i->second.count == 0) {
d_cont.erase(i);
return false;
}
i->second.count--;
return true; // still listed, still blocked
}
void throttle(time_t now, const Thing& t, time_t ttl=0, unsigned int tries=0)
{
typename cont_t::iterator i=d_cont.find(t);
entry e={ now+(ttl ? ttl : d_ttl), tries ? tries : d_limit};
if(i==d_cont.end()) {
d_cont[t]=e;
}
else if(i->second.ttd > e.ttd || (i->second.count) < e.count)
d_cont[t]=e;
}
unsigned int size() const
{
return (unsigned int)d_cont.size();
}
void clear()
{
d_cont.clear();
}
private:
unsigned int d_limit;
time_t d_ttl;
time_t d_last_clean;
struct entry
{
time_t ttd;
unsigned int count;
};
typedef map<Thing,entry> cont_t;
cont_t d_cont;
};
/** Class that implements a decaying EWMA.
This class keeps an exponentially weighted moving average which, additionally, decays over time.
The decaying is only done on get.
*/
class DecayingEwma
{
public:
DecayingEwma() : d_val(0.0)
{
d_needinit=true;
d_last.tv_sec = d_last.tv_usec = 0;
d_lastget=d_last;
}
DecayingEwma(const DecayingEwma& orig) : d_last(orig.d_last), d_lastget(orig.d_lastget), d_val(orig.d_val), d_needinit(orig.d_needinit)
{
}
void submit(int val, const struct timeval* tv)
{
struct timeval now=*tv;
if(d_needinit) {
d_last=now;
d_lastget=now;
d_needinit=false;
d_val = val;
}
else {
float diff= makeFloat(d_last - now);
d_last=now;
double factor=exp(diff)/2.0; // might be '0.5', or 0.0001
d_val=(float)((1-factor)*val+ (float)factor*d_val);
}
}
double get(const struct timeval* tv)
{
struct timeval now=*tv;
float diff=makeFloat(d_lastget-now);
d_lastget=now;
float factor=exp(diff/60.0f); // is 1.0 or less
return d_val*=factor;
}
double peek(void) const
{
return d_val;
}
bool stale(time_t limit) const
{
return limit > d_lastget.tv_sec;
}
private:
struct timeval d_last; // stores time
struct timeval d_lastget; // stores time
float d_val;
bool d_needinit;
};
template<class Thing> class Counters : public boost::noncopyable
{
public:
Counters()
{
}
unsigned long value(const Thing& t) const
{
typename cont_t::const_iterator i=d_cont.find(t);
if(i==d_cont.end()) {
return 0;
}
return (unsigned long)i->second;
}
unsigned long incr(const Thing& t)
{
typename cont_t::iterator i=d_cont.find(t);
if(i==d_cont.end()) {
d_cont[t]=1;
return 1;
}
else {
if (i->second < std::numeric_limits<unsigned long>::max())
i->second++;
return (unsigned long)i->second;
}
}
unsigned long decr(const Thing& t)
{
typename cont_t::iterator i=d_cont.find(t);
if(i!=d_cont.end() && --i->second == 0) {
d_cont.erase(i);
return 0;
} else
return (unsigned long)i->second;
}
void clear(const Thing& t)
{
typename cont_t::iterator i=d_cont.find(t);
if(i!=d_cont.end()) {
d_cont.erase(i);
}
}
void clear()
{
d_cont.clear();
}
size_t size() const
{
return d_cont.size();
}
private:
typedef map<Thing,unsigned long> cont_t;
cont_t d_cont;
};
class SyncRes : public boost::noncopyable
{
public:
enum LogMode { LogNone, Log, Store};
typedef std::function<int(const ComboAddress& ip, const DNSName& qdomain, int qtype, bool doTCP, bool sendRDQuery, int EDNS0Level, struct timeval* now, boost::optional<Netmask>& srcmask, boost::optional<const ResolveContext&> context, std::shared_ptr<RemoteLogger> outgoingLogger, LWResult *lwr, bool* chained)> asyncresolve_t;
struct EDNSStatus
{
EDNSStatus() : mode(UNKNOWN), modeSetAt(0) {}
enum EDNSMode { UNKNOWN=0, EDNSOK=1, EDNSIGNORANT=2, NOEDNS=3 } mode;
time_t modeSetAt;
};
//! This represents a number of decaying Ewmas, used to store performance per nameserver-name.
/** Modelled to work mostly like the underlying DecayingEwma. After you've called get,
d_best is filled out with the best address for this collection */
struct DecayingEwmaCollection
{
void submit(const ComboAddress& remote, int usecs, const struct timeval* now)
{
d_collection[remote].submit(usecs, now);
}
double get(const struct timeval* now)
{
if(d_collection.empty())
return 0;
double ret=std::numeric_limits<double>::max();
double tmp;
for (auto& entry : d_collection) {
if((tmp = entry.second.get(now)) < ret) {
ret=tmp;
d_best=entry.first;
}
}
return ret;
}
bool stale(time_t limit) const
{
for(const auto& entry : d_collection)
if(!entry.second.stale(limit))
return false;
return true;
}
void purge(const std::map<ComboAddress, double>& keep)
{
for (auto iter = d_collection.begin(); iter != d_collection.end(); ) {
if (keep.find(iter->first) != keep.end()) {
++iter;
}
else {
iter = d_collection.erase(iter);
}
}
}
typedef std::map<ComboAddress, DecayingEwma> collection_t;
collection_t d_collection;
ComboAddress d_best;
};
typedef map<DNSName, DecayingEwmaCollection> nsspeeds_t;
typedef map<ComboAddress, EDNSStatus> ednsstatus_t;
vState getDSRecords(const DNSName& zone, dsmap_t& ds, bool onlyTA, unsigned int depth, bool bogusOnNXD=true, bool* foundCut=nullptr);
class AuthDomain
{
public:
typedef multi_index_container <
DNSRecord,
indexed_by <
ordered_non_unique<
composite_key< DNSRecord,
member<DNSRecord, DNSName, &DNSRecord::d_name>,
member<DNSRecord, uint16_t, &DNSRecord::d_type>
>,
composite_key_compare<std::less<DNSName>, std::less<uint16_t> >
>
>
> records_t;
records_t d_records;
vector<ComboAddress> d_servers;
DNSName d_name;
bool d_rdForward{false};
int getRecords(const DNSName& qname, uint16_t qtype, std::vector<DNSRecord>& records) const;
bool isAuth() const
{
return d_servers.empty();
}
bool isForward() const
{
return !isAuth();
}
bool shouldRecurse() const
{
return d_rdForward;
}
const DNSName& getName() const
{
return d_name;
}
private:
void addSOA(std::vector<DNSRecord>& records) const;
};
typedef map<DNSName, AuthDomain> domainmap_t;
typedef Throttle<boost::tuple<ComboAddress,DNSName,uint16_t> > throttle_t;
typedef Counters<ComboAddress> fails_t;
struct ThreadLocalStorage {
NegCache negcache;
nsspeeds_t nsSpeeds;
throttle_t throttle;
ednsstatus_t ednsstatus;
fails_t fails;
std::shared_ptr<domainmap_t> domainmap;
};
static void setDefaultLogMode(LogMode lm)
{
s_lm = lm;
}
static void doEDNSDumpAndClose(int fd);
static uint64_t doDumpNSSpeeds(int fd);
static int getRootNS(struct timeval now, asyncresolve_t asyncCallback);
static void clearDelegationOnly()
{
s_delegationOnly.clear();
}
static void addDelegationOnly(const DNSName& name)
{
s_delegationOnly.insert(name);
}
static void addDontQuery(const std::string& mask)
{
if (!s_dontQuery)
s_dontQuery = std::unique_ptr<NetmaskGroup>(new NetmaskGroup());
s_dontQuery->addMask(mask);
}
static void addDontQuery(const Netmask& mask)
{
if (!s_dontQuery)
s_dontQuery = std::unique_ptr<NetmaskGroup>(new NetmaskGroup());
s_dontQuery->addMask(mask);
}
static void clearDontQuery()
{
s_dontQuery = nullptr;
}
static void parseEDNSSubnetWhitelist(const std::string& wlist);
static void addEDNSSubnet(const Netmask& subnet)
{
s_ednssubnets.addMask(subnet);
}
static void addEDNSDomain(const DNSName& domain)
{
s_ednsdomains.add(domain);
}
static void clearEDNSSubnets()
{
s_ednssubnets.clear();
}
static void clearEDNSDomains()
{
s_ednsdomains = SuffixMatchNode();
}
static void pruneNSSpeeds(time_t limit)
{
for(auto i = t_sstorage.nsSpeeds.begin(), end = t_sstorage.nsSpeeds.end(); i != end; ) {
if(i->second.stale(limit)) {
i = t_sstorage.nsSpeeds.erase(i);
}
else {
++i;
}
}
}
static uint64_t getNSSpeedsSize()
{
return t_sstorage.nsSpeeds.size();
}
static void submitNSSpeed(const DNSName& server, const ComboAddress& ca, uint32_t usec, const struct timeval* now)
{
t_sstorage.nsSpeeds[server].submit(ca, usec, now);
}
static void clearNSSpeeds()
{
t_sstorage.nsSpeeds.clear();
}
static EDNSStatus::EDNSMode getEDNSStatus(const ComboAddress& server)
{
const auto& it = t_sstorage.ednsstatus.find(server);
if (it == t_sstorage.ednsstatus.end())
return EDNSStatus::UNKNOWN;
return it->second.mode;
}
static uint64_t getEDNSStatusesSize()
{
return t_sstorage.ednsstatus.size();
}
static void clearEDNSStatuses()
{
t_sstorage.ednsstatus.clear();
}
static uint64_t getThrottledServersSize()
{
return t_sstorage.throttle.size();
}
static void clearThrottle()
{
t_sstorage.throttle.clear();
}
static bool isThrottled(time_t now, const ComboAddress& server, const DNSName& target, uint16_t qtype)
{
return t_sstorage.throttle.shouldThrottle(now, boost::make_tuple(server, target, qtype));
}
static bool isThrottled(time_t now, const ComboAddress& server)
{
return t_sstorage.throttle.shouldThrottle(now, boost::make_tuple(server, "", 0));
}
static void doThrottle(time_t now, const ComboAddress& server, time_t duration, unsigned int tries)
{
t_sstorage.throttle.throttle(now, boost::make_tuple(server, "", 0), duration, tries);
}
static uint64_t getFailedServersSize()
{
return t_sstorage.fails.size();
}
static void clearFailedServers()
{
t_sstorage.fails.clear();
}
static unsigned long getServerFailsCount(const ComboAddress& server)
{
return t_sstorage.fails.value(server);
}
static void clearNegCache()
{
t_sstorage.negcache.clear();
}
static uint64_t getNegCacheSize()
{
return t_sstorage.negcache.size();
}
static void pruneNegCache(unsigned int maxEntries)
{
t_sstorage.negcache.prune(maxEntries);
}
static uint64_t wipeNegCache(const DNSName& name, bool subtree = false)
{
return t_sstorage.negcache.wipe(name, subtree);
}
static void setDomainMap(std::shared_ptr<domainmap_t> newMap)
{
t_sstorage.domainmap = newMap;
}
static const std::shared_ptr<domainmap_t> getDomainMap()
{
return t_sstorage.domainmap;
}
static void setECSScopeZeroAddress(const Netmask& scopeZeroMask)
{
s_ecsScopeZero.source = scopeZeroMask;
}
explicit SyncRes(const struct timeval& now);
int beginResolve(const DNSName &qname, const QType &qtype, uint16_t qclass, vector<DNSRecord>&ret);
void setId(int id)
{
if(doLog())
d_prefix="["+itoa(id)+"] ";
}
void setLogMode(LogMode lm)
{
d_lm = lm;
}
bool doLog() const
{
return d_lm != LogNone;
}
void setCacheOnly(bool state=true)
{
d_cacheonly=state;
}
void setDoEDNS0(bool state=true)
{
d_doEDNS0=state;
}
void setDoDNSSEC(bool state=true)
{
d_doDNSSEC=state;
}
void setDNSSECValidationRequested(bool requested=true)
{
d_DNSSECValidationRequested = requested;
}
bool isDNSSECValidationRequested() const
{
return d_DNSSECValidationRequested;
}
bool shouldValidate() const
{
return d_DNSSECValidationRequested && !d_wasOutOfBand;
}
void setWantsRPZ(bool state=true)
{
d_wantsRPZ=state;
}
bool getWantsRPZ() const
{
return d_wantsRPZ;
}
void setIncomingECSFound(bool state=true)
{
d_incomingECSFound=state;
}
string getTrace() const
{
return d_trace.str();
}
void setLuaEngine(shared_ptr<RecursorLua4> pdl)
{
d_pdl = pdl;
}
bool wasVariable() const
{
return d_wasVariable;
}
bool wasOutOfBand() const
{
return d_wasOutOfBand;
}
struct timeval getNow() const
{
return d_now;
}
void setSkipCNAMECheck(bool skip = false)
{
d_skipCNAMECheck = skip;
}
void setIncomingECS(boost::optional<const EDNSSubnetOpts&> incomingECS);
#ifdef HAVE_PROTOBUF
void setInitialRequestId(boost::optional<const boost::uuids::uuid&> initialRequestId)
{
d_initialRequestId = initialRequestId;
}
#endif
void setAsyncCallback(asyncresolve_t func)
{
d_asyncResolve = func;
}
vState getValidationState() const
{
return d_queryValidationState;
}
static thread_local ThreadLocalStorage t_sstorage;
static std::atomic<uint64_t> s_queries;
static std::atomic<uint64_t> s_outgoingtimeouts;
static std::atomic<uint64_t> s_outgoing4timeouts;
static std::atomic<uint64_t> s_outgoing6timeouts;
static std::atomic<uint64_t> s_throttledqueries;
static std::atomic<uint64_t> s_dontqueries;
static std::atomic<uint64_t> s_authzonequeries;
static std::atomic<uint64_t> s_outqueries;
static std::atomic<uint64_t> s_tcpoutqueries;
static std::atomic<uint64_t> s_nodelegated;
static std::atomic<uint64_t> s_unreachables;
static std::atomic<uint64_t> s_ecsqueries;
static std::atomic<uint64_t> s_ecsresponses;
static string s_serverID;
static unsigned int s_minimumTTL;
static unsigned int s_maxqperq;
static unsigned int s_maxnsaddressqperq;
static unsigned int s_maxtotusec;
static unsigned int s_maxdepth;
static unsigned int s_maxnegttl;
static unsigned int s_maxcachettl;
static unsigned int s_packetcachettl;
static unsigned int s_packetcacheservfailttl;
static unsigned int s_serverdownmaxfails;
static unsigned int s_serverdownthrottletime;
static uint8_t s_ecsipv4limit;
static uint8_t s_ecsipv6limit;
static bool s_doIPv6;
static bool s_noEDNSPing;
static bool s_noEDNS;
static bool s_rootNXTrust;
static bool s_nopacketcache;
std::unordered_map<std::string,bool> d_discardedPolicies;
DNSFilterEngine::Policy d_appliedPolicy;
unsigned int d_authzonequeries;
unsigned int d_outqueries;
unsigned int d_tcpoutqueries;
unsigned int d_throttledqueries;
unsigned int d_timeouts;
unsigned int d_unreachables;
unsigned int d_totUsec;
ComboAddress d_requestor;
private:
static std::unordered_set<DNSName> s_delegationOnly;
static NetmaskGroup s_ednssubnets;
static SuffixMatchNode s_ednsdomains;
static EDNSSubnetOpts s_ecsScopeZero;
static LogMode s_lm;
static std::unique_ptr<NetmaskGroup> s_dontQuery;
struct GetBestNSAnswer
{
DNSName qname;
set<pair<DNSName,DNSName> > bestns;
uint8_t qtype; // only A and AAAA anyhow
bool operator<(const GetBestNSAnswer &b) const
{
return boost::tie(qname, qtype, bestns) <
boost::tie(b.qname, b.qtype, b.bestns);
}
};
typedef std::map<DNSName,vState> zonesStates_t;
int doResolveAt(NsSet &nameservers, DNSName auth, bool flawedNSSet, const DNSName &qname, const QType &qtype, vector<DNSRecord>&ret,
unsigned int depth, set<GetBestNSAnswer>&beenthere, vState& state);
bool doResolveAtThisIP(const std::string& prefix, const DNSName& qname, const QType& qtype, LWResult& lwr, boost::optional<Netmask>& ednsmask, const DNSName& auth, bool const sendRDQuery, const DNSName& nsName, const ComboAddress& remoteIP, bool doTCP, bool* truncated);
bool processAnswer(unsigned int depth, LWResult& lwr, const DNSName& qname, const QType& qtype, DNSName& auth, bool wasForwarded, const boost::optional<Netmask> ednsmask, bool sendRDQuery, NsSet &nameservers, std::vector<DNSRecord>& ret, const DNSFilterEngine& dfe, bool* gotNewServers, int* rcode, vState& state);
int doResolve(const DNSName &qname, const QType &qtype, vector<DNSRecord>&ret, unsigned int depth, set<GetBestNSAnswer>& beenthere, vState& state);
bool doOOBResolve(const AuthDomain& domain, const DNSName &qname, const QType &qtype, vector<DNSRecord>&ret, int& res);
bool doOOBResolve(const DNSName &qname, const QType &qtype, vector<DNSRecord>&ret, unsigned int depth, int &res);
domainmap_t::const_iterator getBestAuthZone(DNSName* qname) const;
bool doCNAMECacheCheck(const DNSName &qname, const QType &qtype, vector<DNSRecord>&ret, unsigned int depth, int &res, vState& state, bool wasAuthZone, bool wasForwardRecurse);
bool doCacheCheck(const DNSName &qname, const DNSName& authname, bool wasForwardedOrAuthZone, bool wasAuthZone, bool wasForwardRecurse, const QType &qtype, vector<DNSRecord>&ret, unsigned int depth, int &res, vState& state);
void getBestNSFromCache(const DNSName &qname, const QType &qtype, vector<DNSRecord>&bestns, bool* flawedNSSet, unsigned int depth, set<GetBestNSAnswer>& beenthere);
DNSName getBestNSNamesFromCache(const DNSName &qname, const QType &qtype, NsSet& nsset, bool* flawedNSSet, unsigned int depth, set<GetBestNSAnswer>&beenthere);
inline vector<DNSName> shuffleInSpeedOrder(NsSet &nameservers, const string &prefix);
bool moreSpecificThan(const DNSName& a, const DNSName &b) const;
vector<ComboAddress> getAddrs(const DNSName &qname, unsigned int depth, set<GetBestNSAnswer>& beenthere, bool cacheOnly, unsigned int& addressQueriesForNS);
bool nameserversBlockedByRPZ(const DNSFilterEngine& dfe, const NsSet& nameservers);
bool nameserverIPBlockedByRPZ(const DNSFilterEngine& dfe, const ComboAddress&);
bool throttledOrBlocked(const std::string& prefix, const ComboAddress& remoteIP, const DNSName& qname, const QType& qtype, bool pierceDontQuery);
vector<ComboAddress> retrieveAddressesForNS(const std::string& prefix, const DNSName& qname, vector<DNSName >::const_iterator& tns, const unsigned int depth, set<GetBestNSAnswer>& beenthere, const vector<DNSName >& rnameservers, NsSet& nameservers, bool& sendRDQuery, bool& pierceDontQuery, bool& flawedNSSet, bool cacheOnly, unsigned int& addressQueriesForNS);
RCode::rcodes_ updateCacheFromRecords(unsigned int depth, LWResult& lwr, const DNSName& qname, const QType& qtype, const DNSName& auth, bool wasForwarded, const boost::optional<Netmask>, vState& state, bool& needWildcardProof, unsigned int& wildcardLabelsCount, bool sendRDQuery);
bool processRecords(const std::string& prefix, const DNSName& qname, const QType& qtype, const DNSName& auth, LWResult& lwr, const bool sendRDQuery, vector<DNSRecord>& ret, set<DNSName>& nsset, DNSName& newtarget, DNSName& newauth, bool& realreferral, bool& negindic, vState& state, const bool needWildcardProof, const unsigned int wildcardLabelsCount);
bool doSpecialNamesResolve(const DNSName &qname, const QType &qtype, const uint16_t qclass, vector<DNSRecord> &ret);
int asyncresolveWrapper(const ComboAddress& ip, bool ednsMANDATORY, const DNSName& domain, int type, bool doTCP, bool sendRDQuery, struct timeval* now, boost::optional<Netmask>& srcmask, LWResult* res, bool* chained) const;
boost::optional<Netmask> getEDNSSubnetMask(const ComboAddress& local, const DNSName&dn, const ComboAddress& rem);
bool validationEnabled() const;
uint32_t computeLowestTTD(const std::vector<DNSRecord>& records, const std::vector<std::shared_ptr<RRSIGRecordContent> >& signatures, uint32_t signaturesTTL) const;
void updateValidationState(vState& state, const vState stateUpdate);
vState validateRecordsWithSigs(unsigned int depth, const DNSName& qname, const QType& qtype, const DNSName& name, const std::vector<DNSRecord>& records, const std::vector<std::shared_ptr<RRSIGRecordContent> >& signatures);
vState validateDNSKeys(const DNSName& zone, const std::vector<DNSRecord>& dnskeys, const std::vector<std::shared_ptr<RRSIGRecordContent> >& signatures, unsigned int depth);
vState getDNSKeys(const DNSName& signer, skeyset_t& keys, unsigned int depth);
dState getDenialValidationState(NegCache::NegCacheEntry& ne, const vState state, const dState expectedState, bool referralToUnsigned);
void updateDenialValidationState(NegCache::NegCacheEntry& ne, vState& state, const dState denialState, const dState expectedState, bool allowOptOut);
void computeNegCacheValidationStatus(NegCache::NegCacheEntry& ne, const DNSName& qname, const QType& qtype, const int res, vState& state, unsigned int depth);
vState getTA(const DNSName& zone, dsmap_t& ds);
bool haveExactValidationStatus(const DNSName& domain);
vState getValidationStatus(const DNSName& subdomain, bool allowIndeterminate=true);
bool lookForCut(const DNSName& qname, unsigned int depth, const vState existingState, vState& newState);
void computeZoneCuts(const DNSName& begin, const DNSName& end, unsigned int depth);
void setUpdatingRootNS()
{
d_updatingRootNS = true;
}
zonesStates_t d_cutStates;
ostringstream d_trace;
shared_ptr<RecursorLua4> d_pdl;
boost::optional<EDNSSubnetOpts> d_incomingECS;
ComboAddress d_incomingECSNetwork;
#ifdef HAVE_PROTOBUF
boost::optional<const boost::uuids::uuid&> d_initialRequestId;
#endif
asyncresolve_t d_asyncResolve{nullptr};
struct timeval d_now;
string d_prefix;
vState d_queryValidationState{Indeterminate};
/* When d_cacheonly is set to true, we will only check the cache.
* This is set when the RD bit is unset in the incoming query
*/
bool d_cacheonly;
bool d_doDNSSEC;
bool d_DNSSECValidationRequested{false};
bool d_doEDNS0{true};
bool d_incomingECSFound{false};
bool d_requireAuthData{true};
bool d_skipCNAMECheck{false};
bool d_updatingRootNS{false};
bool d_wantsRPZ{true};
bool d_wasOutOfBand{false};
bool d_wasVariable{false};
LogMode d_lm;
};
class Socket;
/* external functions, opaque to us */
int asendtcp(const string& data, Socket* sock);
int arecvtcp(string& data, size_t len, Socket* sock, bool incompleteOkay);
struct PacketID
{
PacketID() : id(0), type(0), sock(0), inNeeded(0), inIncompleteOkay(false), outPos(0), nearMisses(0), fd(-1)
{
remote.reset();
}
uint16_t id; // wait for a specific id/remote pair
uint16_t type; // and this is its type
ComboAddress remote; // this is the remote
DNSName domain; // this is the question
Socket* sock; // or wait for an event on a TCP fd
string inMSG; // they'll go here
size_t inNeeded; // if this is set, we'll read until inNeeded bytes are read
bool inIncompleteOkay;
string outMSG; // the outgoing message that needs to be sent
string::size_type outPos; // how far we are along in the outMSG
typedef set<uint16_t > chain_t;
mutable chain_t chain;
mutable uint32_t nearMisses; // number of near misses - host correct, id wrong
int fd;
bool operator<(const PacketID& b) const
{
int ourSock= sock ? sock->getHandle() : 0;
int bSock = b.sock ? b.sock->getHandle() : 0;
if( tie(remote, ourSock, type) < tie(b.remote, bSock, b.type))
return true;
if( tie(remote, ourSock, type) > tie(b.remote, bSock, b.type))
return false;
return tie(domain, fd, id) < tie(b.domain, b.fd, b.id);
}
};
struct PacketIDBirthdayCompare: public std::binary_function<PacketID, PacketID, bool>
{
bool operator()(const PacketID& a, const PacketID& b) const
{
int ourSock= a.sock ? a.sock->getHandle() : 0;
int bSock = b.sock ? b.sock->getHandle() : 0;
if( tie(a.remote, ourSock, a.type) < tie(b.remote, bSock, b.type))
return true;
if( tie(a.remote, ourSock, a.type) > tie(b.remote, bSock, b.type))
return false;
return a.domain < b.domain;
}
};
extern thread_local std::unique_ptr<MemRecursorCache> t_RC;
extern thread_local std::unique_ptr<RecursorPacketCache> t_packetCache;
typedef MTasker<PacketID,string> MT_t;
MT_t* getMT();
struct RecursorStats
{
std::atomic<uint64_t> servFails;
std::atomic<uint64_t> nxDomains;
std::atomic<uint64_t> noErrors;
std::atomic<uint64_t> answers0_1, answers1_10, answers10_100, answers100_1000, answersSlow;
std::atomic<uint64_t> auth4Answers0_1, auth4Answers1_10, auth4Answers10_100, auth4Answers100_1000, auth4AnswersSlow;
std::atomic<uint64_t> auth6Answers0_1, auth6Answers1_10, auth6Answers10_100, auth6Answers100_1000, auth6AnswersSlow;
std::atomic<uint64_t> ourtime0_1, ourtime1_2, ourtime2_4, ourtime4_8, ourtime8_16, ourtime16_32, ourtimeSlow;
double avgLatencyUsec{0};
double avgLatencyOursUsec{0};
std::atomic<uint64_t> qcounter; // not increased for unauth packets
std::atomic<uint64_t> ipv6qcounter;
std::atomic<uint64_t> tcpqcounter;
std::atomic<uint64_t> unauthorizedUDP; // when this is increased, qcounter isn't
std::atomic<uint64_t> unauthorizedTCP; // when this is increased, qcounter isn't
std::atomic<uint64_t> policyDrops;
std::atomic<uint64_t> tcpClientOverflow;
std::atomic<uint64_t> clientParseError;
std::atomic<uint64_t> serverParseError;
std::atomic<uint64_t> tooOldDrops;
std::atomic<uint64_t> queryPipeFullDrops;
std::atomic<uint64_t> unexpectedCount;
std::atomic<uint64_t> caseMismatchCount;
std::atomic<uint64_t> spoofCount;
std::atomic<uint64_t> resourceLimits;
std::atomic<uint64_t> overCapacityDrops;
std::atomic<uint64_t> ipv6queries;
std::atomic<uint64_t> chainResends;
std::atomic<uint64_t> nsSetInvalidations;
std::atomic<uint64_t> ednsPingMatches;
std::atomic<uint64_t> ednsPingMismatches;
std::atomic<uint64_t> noPingOutQueries, noEdnsOutQueries;
std::atomic<uint64_t> packetCacheHits;
std::atomic<uint64_t> noPacketError;
std::atomic<uint64_t> ignoredCount;
time_t startupTime;
std::atomic<uint64_t> dnssecQueries;
unsigned int maxMThreadStackUsage;
std::atomic<uint64_t> dnssecValidations; // should be the sum of all dnssecResult* stats
std::map<vState, std::atomic<uint64_t> > dnssecResults;
std::map<DNSFilterEngine::PolicyKind, std::atomic<uint64_t> > policyResults;
};
//! represents a running TCP/IP client session
class TCPConnection : public boost::noncopyable
{
public:
TCPConnection(int fd, const ComboAddress& addr);
~TCPConnection();
int getFD() const
{
return d_fd;
}
enum stateenum {BYTE0, BYTE1, GETQUESTION, DONE} state{BYTE0};
uint16_t qlen{0};
uint16_t bytesread{0};
const ComboAddress d_remote;
char data[65535]; // damn
size_t queriesCount{0};
static unsigned int getCurrentConnections() { return s_currentConnections; }
private:
const int d_fd;
static AtomicCounter s_currentConnections; //!< total number of current TCP connections
};
class ImmediateServFailException
{
public:
ImmediateServFailException(string r){reason=r;};
string reason; //! Print this to tell the user what went wrong
};
typedef boost::circular_buffer<ComboAddress> addrringbuf_t;
extern thread_local std::unique_ptr<addrringbuf_t> t_servfailremotes, t_largeanswerremotes, t_remotes;
extern thread_local std::unique_ptr<boost::circular_buffer<pair<DNSName,uint16_t> > > t_queryring, t_servfailqueryring;
extern thread_local std::shared_ptr<NetmaskGroup> t_allowFrom;
string doQueueReloadLuaScript(vector<string>::const_iterator begin, vector<string>::const_iterator end);
string doTraceRegex(vector<string>::const_iterator begin, vector<string>::const_iterator end);
void parseACLs();
extern RecursorStats g_stats;
extern unsigned int g_numThreads;
extern uint16_t g_outgoingEDNSBufsize;
extern std::atomic<uint32_t> g_maxCacheEntries, g_maxPacketCacheEntries;
extern bool g_lowercaseOutgoing;
std::string reloadAuthAndForwards();
ComboAddress parseIPAndPort(const std::string& input, uint16_t port);
ComboAddress getQueryLocalAddress(int family, uint16_t port);
typedef boost::function<void*(void)> pipefunc_t;
void broadcastFunction(const pipefunc_t& func);
void distributeAsyncFunction(const std::string& question, const pipefunc_t& func);
int directResolve(const DNSName& qname, const QType& qtype, int qclass, vector<DNSRecord>& ret);
template<class T> T broadcastAccFunction(const boost::function<T*()>& func);
std::shared_ptr<SyncRes::domainmap_t> parseAuthAndForwards();
uint64_t* pleaseGetNsSpeedsSize();
uint64_t* pleaseGetCacheSize();
uint64_t* pleaseGetNegCacheSize();
uint64_t* pleaseGetCacheHits();
uint64_t* pleaseGetCacheMisses();
uint64_t* pleaseGetConcurrentQueries();
uint64_t* pleaseGetThrottleSize();
uint64_t* pleaseGetPacketCacheHits();
uint64_t* pleaseGetPacketCacheSize();
uint64_t* pleaseWipeCache(const DNSName& canon, bool subtree=false);
uint64_t* pleaseWipePacketCache(const DNSName& canon, bool subtree);
uint64_t* pleaseWipeAndCountNegCache(const DNSName& canon, bool subtree=false);
void doCarbonDump(void*);
void primeHints(void);
extern __thread struct timeval g_now;
#ifdef HAVE_PROTOBUF
extern thread_local std::unique_ptr<boost::uuids::random_generator> t_uuidGenerator;
#endif
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