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diff --git a/src/ceph/src/common/admin_socket.h b/src/ceph/src/common/admin_socket.h
new file mode 100644
index 0000000..e526ba3
--- /dev/null
+++ b/src/ceph/src/common/admin_socket.h
@@ -0,0 +1,109 @@
+// -*- 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_COMMON_ADMIN_SOCKET_H
+#define CEPH_COMMON_ADMIN_SOCKET_H
+
+#include "common/Cond.h"
+
+class AdminSocket;
+class CephContext;
+
+#define CEPH_ADMIN_SOCK_VERSION "2"
+
+class AdminSocketHook {
+public:
+  virtual bool call(std::string command, cmdmap_t &cmdmap, std::string format,
+		    bufferlist& out) = 0;
+  virtual ~AdminSocketHook() {}
+};
+
+class AdminSocket : public Thread
+{
+public:
+  AdminSocket(CephContext *cct);
+  ~AdminSocket() override;
+
+  /**
+   * register an admin socket command
+   *
+   * The command is registered under a command string.  Incoming
+   * commands are split by space and matched against the longest
+   * registered command.  For example, if 'foo' and 'foo bar' are
+   * registered, and an incoming command is 'foo bar baz', it is
+   * matched with 'foo bar', while 'foo fud' will match 'foo'.
+   *
+   * The entire incoming command string is passed to the registred
+   * hook.
+   *
+   * @param command command string
+   * @param cmddesc command syntax descriptor
+   * @param hook implementaiton
+   * @param help help text.  if empty, command will not be included in 'help' output.
+   *
+   * @return 0 for success, -EEXIST if command already registered.
+   */
+  int register_command(std::string command, std::string cmddesc, AdminSocketHook *hook, std::string help);
+
+  /**
+   * unregister an admin socket command.
+   *
+   * If a command is currently in progress, this will block until it
+   * is done.  For that reason, you must not hold any locks required
+   * by your hook while you call this.
+   *
+   * @param command command string
+   * @return 0 on succest, -ENOENT if command dne.
+   */
+  int unregister_command(std::string command);
+
+  bool init(const std::string &path);
+
+  void chown(uid_t uid, gid_t gid);
+  void chmod(mode_t mode);
+
+private:
+  AdminSocket(const AdminSocket& rhs);
+  AdminSocket& operator=(const AdminSocket &rhs);
+
+  void shutdown();
+
+  std::string create_shutdown_pipe(int *pipe_rd, int *pipe_wr);
+  std::string destroy_shutdown_pipe();
+  std::string bind_and_listen(const std::string &sock_path, int *fd);
+
+  void *entry() override;
+  bool do_accept();
+
+  CephContext *m_cct;
+  std::string m_path;
+  int m_sock_fd;
+  int m_shutdown_rd_fd;
+  int m_shutdown_wr_fd;
+
+  bool in_hook;
+  Cond in_hook_cond;
+  Mutex m_lock;    // protects m_hooks, m_descs, m_help
+  AdminSocketHook *m_version_hook, *m_help_hook, *m_getdescs_hook;
+
+  std::map<std::string,AdminSocketHook*> m_hooks;
+  std::map<std::string,std::string> m_descs;
+  std::map<std::string,std::string> m_help;
+
+  friend class AdminSocketTest;
+  friend class HelpHook;
+  friend class GetdescsHook;
+};
+
+#endif