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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 <string>
#include <map>
#include <sys/types.h>
#include "pdns/namespaces.hh"
#include "pdns/misc.hh"
/** The CoWrapper class wraps around a coprocess and restarts it if needed.
It may also send out pings and expect banners */
class CoWrapper
{
public:
CoWrapper(const string& command, int timeout, int abiVersion);
~CoWrapper();
void send(const string& line);
void receive(string& line);
private:
std::unique_ptr<CoRemote> d_cp;
string d_command;
void launch();
int d_timeout;
int d_abiVersion;
};
class PipeBackend : public DNSBackend
{
public:
PipeBackend(const string& suffix = "");
~PipeBackend() override;
unsigned int getCapabilities() override { return CAP_DIRECT | CAP_LIST; }
void lookup(const QType& qtype, const DNSName& qname, domainid_t zoneId, DNSPacket* pkt_p = nullptr) override;
bool list(const ZoneName& target, domainid_t domain_id, bool include_disabled = false) override;
bool get(DNSResourceRecord& r) override;
string directBackendCmd(const string& query) override;
static DNSBackend* maker();
private:
void launch();
void cleanup();
std::unique_ptr<CoWrapper> d_coproc;
std::unique_ptr<Regex> d_regex;
DNSName d_qname;
QType d_qtype;
string d_regexstr;
bool d_disavow;
int d_abiVersion;
};
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