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/*
PowerDNS Versatile Database Driven Nameserver
Copyright (C) 2002 - 2008 PowerDNS.COM BV
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2
as published by the Free Software Foundation
Additionally, the license of this program contains a special
exception which allows to distribute the program in binary form when
it is linked against OpenSSL.
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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "pdns/utility.hh"
#include "pdns/dnsbackend.hh"
#include "pdns/dns.hh"
#include "pdns/dnsbackend.hh"
#include "pdns/dnspacket.hh"
#include "pdns/pdnsexception.hh"
#include "pdns/logger.hh"
#include "pdns/version.hh"
#include <boost/algorithm/string.hpp>
/* FIRST PART */
class RandomBackend : public DNSBackend
{
public:
RandomBackend(const string &suffix="")
{
setArgPrefix("random"+suffix);
d_ourname=getArg("hostname");
}
bool list(const string &target, int id, bool include_disabled) {
return false; // we don't support AXFR
}
void lookup(const QType &type, const string &qdomain, DNSPacket *p, int zoneId)
{
if((type.getCode()!=QType::ANY && type.getCode()!=QType::A) || !pdns_iequals(qdomain, d_ourname)) // we only know about random.example.com A by default
d_answer=""; // no answer
else {
ostringstream os;
os<<Utility::random()%256<<"."<<Utility::random()%256<<"."<<Utility::random()%256<<"."<<Utility::random()%256;
d_answer=os.str(); // our random ip address
}
}
bool get(DNSResourceRecord &rr)
{
if(!d_answer.empty()) {
rr.qname=d_ourname; // fill in details
rr.qtype=QType::A; // A record
rr.ttl=5; // 5 seconds
rr.auth = 1; // it may be random.. but it is auth!
rr.content=d_answer;
d_answer=""; // this was the last answer
return true;
}
return false; // no more data
}
private:
string d_answer;
string d_ourname;
};
/* SECOND PART */
class RandomFactory : public BackendFactory
{
public:
RandomFactory() : BackendFactory("random") {}
void declareArguments(const string &suffix="")
{
declare(suffix,"hostname","Hostname which is to be random","random.example.com");
}
DNSBackend *make(const string &suffix="")
{
return new RandomBackend(suffix);
}
};
/* THIRD PART */
class RandomLoader
{
public:
RandomLoader()
{
BackendMakers().report(new RandomFactory);
L << Logger::Info << "[randombackend] This is the random backend version " VERSION " (" __DATE__ ", " __TIME__ ") reporting" << endl;
}
};
static RandomLoader randomLoader;
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