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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 <cdb.h>
#include "misc.hh"
// This class is responsible for the reading of a CDB file.
// The constructor opens the CDB file, the destructor closes it, so make sure you call that.
class CDB
{
public:
CDB(const string &cdbfile);
~CDB();
/* Return negative value on error or non-negative value on success.
Values can be retrieved via readNext() */
int searchKey(const string &key);
bool searchSuffix(const string &key);
void searchAll();
bool readNext(pair<string, string> &value);
vector<string> findall(string &key);
bool keyExists(const string& key);
bool findOne(const string& key, string& value);
private:
bool moveToNext();
int d_fd{-1};
struct cdb d_cdb;
struct cdb_find d_cdbf;
std::string d_key;
unsigned d_seqPtr{0};
enum SearchType { SearchSuffix, SearchKey, SearchAll } d_searchType{SearchKey};
};
class CDBWriter
{
public:
/* we own the fd after this call, don't ever touch it */
CDBWriter(int fd);
~CDBWriter();
bool addEntry(const std::string& key, const std::string& value);
/* finalize the database and close the fd, the only thing you can do now is to call the destructor */
void close();
private:
struct cdb_make d_cdbm;
int d_fd{-1};
};
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