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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
#include <boost/multi_index_container.hpp>
#include "dnsparser.hh"
#include "dnsname.hh"
#include "dns.hh"
#include "validate.hh"
using namespace ::boost::multi_index;
/* FIXME should become part of the normal cache (I think) and shoudl become more like
* struct {
* vector<DNSRecord> records;
* vector<DNSRecord> signatures;
* } recsig_t;
*
* typedef vector<recsig_t> recordsAndSignatures;
*/
typedef struct {
vector<DNSRecord> records;
vector<DNSRecord> signatures;
} recordsAndSignatures;
class NegCache : public boost::noncopyable {
public:
struct NegCacheEntry {
DNSName d_name; // The denied name
QType d_qtype; // The denied type
DNSName d_auth; // The denying name (aka auth)
uint32_t d_ttd; // Timestamp when this entry should die
recordsAndSignatures authoritySOA; // The upstream SOA record and RRSIGs
recordsAndSignatures DNSSECRecords; // The upstream NSEC(3) and RRSIGs
mutable vState d_validationState{Indeterminate};
uint32_t getTTD() const {
return d_ttd;
};
};
void add(const NegCacheEntry& ne);
void updateValidationStatus(const DNSName& qname, const QType& qtype, const vState newState);
bool get(const DNSName& qname, const QType& qtype, const struct timeval& now, NegCacheEntry& ne, bool typeMustMatch=false);
bool getRootNXTrust(const DNSName& qname, const struct timeval& now, NegCacheEntry& ne);
uint64_t count(const DNSName& qname) const;
uint64_t count(const DNSName& qname, const QType qtype) const;
void prune(unsigned int maxEntries);
void clear();
uint64_t dumpToFile(FILE* fd);
uint64_t wipe(const DNSName& name, bool subtree = false);
uint64_t size() {
return d_negcache.size();
};
void preRemoval(const NegCacheEntry& entry)
{
}
private:
typedef boost::multi_index_container <
NegCacheEntry,
indexed_by <
ordered_unique <
composite_key <
NegCacheEntry,
member<NegCacheEntry, DNSName, &NegCacheEntry::d_name>,
member<NegCacheEntry, QType, &NegCacheEntry::d_qtype>
>,
composite_key_compare <
CanonDNSNameCompare, std::less<QType>
>
>,
sequenced<>
>
> negcache_t;
// Required for the cachecleaner
typedef negcache_t::nth_index<1>::type negcache_sequence_t;
// Stores the negative cache entries
negcache_t d_negcache;
};
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