1 files changed, 70 insertions, 0 deletions
diff --git a/cdb.hh b/cdb.hh
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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};
+};