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diff --git a/src/common/ConfUtils.h b/src/common/ConfUtils.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2011 New Dream Network
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_CONFUTILS_H
+#define CEPH_CONFUTILS_H
+
+#include <deque>
+#include <map>
+#include <set>
+#include <string>
+#include <string_view>
+#include <vector>
+
+#include "include/buffer_fwd.h"
+
+/*
+ * Ceph configuration file support.
+ *
+ * This class loads an INI-style configuration from a file or bufferlist, and
+ * holds it in memory. In general, an INI configuration file is composed of
+ * sections, which contain key/value pairs. You can put comments on the end of
+ * lines by using either a hash mark (#) or the semicolon (;).
+ *
+ * You can get information out of ConfFile by calling get_key or by examining
+ * individual sections.
+ *
+ * This class could be extended to support modifying configuration files and
+ * writing them back out without too much difficulty. Currently, this is not
+ * implemented, and the file is read-only.
+ */
+struct conf_line_t  {
+  conf_line_t() = default;
+  conf_line_t(const std::string& key, const std::string& val);
+  bool operator<(const conf_line_t& rhs) const;
+  std::string key;
+  std::string val;
+};
+
+std::ostream &operator<<(std::ostream& oss, const conf_line_t& line);
+
+class conf_section_t : public std::set<conf_line_t> {
+public:
+  conf_section_t() = default;
+  conf_section_t(const std::string& heading,
+		 const std::vector<conf_line_t>& lines);
+  std::string heading;
+  friend std::ostream& operator<<(std::ostream& os, const conf_section_t&);
+};
+
+class ConfFile : public std::map<std::string, conf_section_t, std::less<>> {
+  using base_type = std::map<std::string, conf_section_t, std::less<>>;
+public:
+  ConfFile()
+    : ConfFile{std::vector<conf_section_t>{}}
+  {}
+  ConfFile(const conf_line_t& line)
+    : ConfFile{{conf_section_t{"global", {line}}}}
+  {}
+  ConfFile(const std::vector<conf_section_t>& sections);
+  int parse_file(const std::string &fname, std::ostream *warnings);
+  int parse_bufferlist(ceph::bufferlist *bl, std::ostream *warnings);
+  bool parse_buffer(std::string_view buf, std::ostream* warning);
+  int read(std::string_view section, std::string_view key,
+	   std::string &val) const;
+  static std::string normalize_key_name(std::string_view key);
+  // print warnings to os if any old-style section name is found
+  //
+  // consider a section name as old-style name if it starts with any of the
+  // given prefixes, but does not follow with a "."
+  void check_old_style_section_names(const std::vector<std::string>& prefixes,
+				     std::ostream& os);
+
+};
+
+std::ostream &operator<<(std::ostream& oss, const ConfFile& cf);
+
+#endif