diff --git a/include/server_def.h b/include/server_def.h
new file mode 100644
index 0000000..2a9d07e
--- /dev/null
+++ b/include/server_def.h
@@ -0,0 +1,122 @@
+    /*********************************************************************\
+    *  Copyright (c) 1991 by Wen-King Su (wen-king@vlsi.cs.caltech.edu)   *
+    *                                                                     *
+    *  You may copy or modify this file in any manner you wish, provided  *
+    *  that this notice is always included, and that you hold the author  *
+    *  harmless for any loss or damage resulting from the installation or *
+    *  use of this software.                                              *
+    \*********************************************************************/
+
+#ifndef _FSP_SERVER_DEF_H_
+#define _FSP_SERVER_DEF_H_ 1
+
+#include "common_def.h"
+#include "server_conf.h"
+
+#define NBSIZE (2*sizeof(UBUF))
+
+/****************************************************************************
+*  HTAB is structure for storing client information for one client machine.
+*  They makes it easy to reuse regular unix tool's source for new purposes.
+****************************************************************************/
+
+typedef struct HTAB HTAB;
+
+struct HTAB {	unsigned long	inet_num;	/* inet number of client     */
+		char	       *hostname;	/* hostname of client        */
+		time_t          last_acc;	/* last sucessful access time*/
+		unsigned short	next_key;	/* next key client should use*/
+		unsigned short	last_key;	/* previous key client used  */
+		unsigned short   acc_cnt;	/* number of successful acc  */
+		unsigned short   active; };	/* session continuing.	     */
+
+/****************************************************************************
+*  IPrange is the structure for storing information about disabled, ignored
+*  or normal hosts.
+****************************************************************************/
+typedef struct {
+    unsigned char lo[4];
+    unsigned char hi[4];
+    char *text;
+} IPrange;
+
+/*****************************************************************************
+* The PPATH structure is filled in by the function check_path when given a
+* path string.  See server_file.c for more info.
+*****************************************************************************/
+
+typedef struct { 
+    const char    *fullp; /* ptr to string containing full pathname  */
+    const char    *f_ptr; /* ptr to begining of last path component  */
+    unsigned int   f_len; /* length of last component in path        */
+    const char    *d_ptr; /* ptr to beginning of directory component */
+    unsigned int   d_len; /* length of directory part of path.       */
+    const char   *passwd; /* ptr to password                  */
+    char     inetstr[16]; /* inet-address of remote-FSP        */
+    char      portstr[8];  /* port of remote-FSP                */
+} PPATH;
+
+/* open file handles cache */
+typedef struct { FILE *fp;
+                 unsigned long inet_num;
+                 unsigned long port_num;
+               } FPCACHE;
+
+/* DIRLISTING holds open directory listings */
+typedef struct {
+    BYTE *listing;       /* pointer to directory listing */
+    size_t listing_size; /* how many bytes has listing? */
+    time_t mtime;        /* when cache was build */
+} DIRLISTING;
+
+/* hold directory information */
+typedef struct {
+    char *realname;           /* real directory name, full path resolved */
+    IPrange *owner;           /* owners of this directory */
+    unsigned char protection; /* directory protection flags */
+    char *public_password;    /* password for file access */
+    char *owner_password;     /* password for owners */
+    char *readme;             /* readme content */
+    time_t mtime;             /* directory last modified time */
+    time_t lastcheck;         /* when the directory was last stat()-ed */
+} DIRINFO;
+
+#define REVERSE_ERR_MSG "Permission denied -- can't identify host.\n\
+  Sorry, we can't reverse name you.  If you know that your site normally\n\
+  can be, try again in a few minutes when the local maps may have been\n\
+  updated.  Otherwise, this service is unavailable to you; check\n\
+  with your local admins for as to why this is the case.\n"
+
+/* definition of logging information */
+#define L_NONE		0x0000
+#define L_ERR		0x0001
+#define L_VER		0x0002
+#define L_GETDIR	0x0004
+#define L_GETFILE	0x0008
+#define L_UPLOAD	0x0010
+#define L_INSTALL	0x0020
+#define L_DELFILE	0x0040
+#define L_DELDIR	0x0080
+#define L_SETPRO	0x0100
+#define L_MAKEDIR	0x0200
+#define L_GRABFILE	0x0400
+#define L_GETPRO	0x0800
+#define L_RDONLY	0x1000  
+#define L_STAT		0x2000
+#define L_RENAME	0x4000
+#define L_ALL		0xffff
+
+/* cache directory listing */
+#define FSP_DIRLISTING ".FSP_CONTENT"
+/* file names used for access control */
+#define FSP_NOGET ".FSP_NO_GET"
+#define FSP_DEL ".FSP_OK_DEL"
+#define FSP_ADD ".FSP_OK_ADD"
+#define FSP_MKDIR ".FSP_OK_MKDIR"
+#define FSP_RENAME ".FSP_OK_RENAME"
+#define FSP_NOLIST ".FSP_NO_LIST"
+#define FSP_OWNER ".FSP_OWNER"
+#define FSP_PASSWORD ".FSP_OK_PASSWORD"
+#define FSP_OWNERPASSWORD ".FSP_OWNER_PASSWORD"
+  
+#endif /* _FSP_SERVER_DEF_H_ */