diff --git a/lib/vty.h b/lib/vty.h
new file mode 100644
index 0000000..4d2a6a0
--- /dev/null
+++ b/lib/vty.h
@@ -0,0 +1,205 @@
+/* Virtual terminal [aka TeletYpe] interface routine
+   Copyright (C) 1997 Kunihiro Ishiguro
+
+This file is part of GNU Zebra.
+
+GNU Zebra is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+
+GNU Zebra 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 GNU Zebra; see the file COPYING.  If not, write to the Free
+Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+02111-1307, USA.  */
+
+#ifndef _ZEBRA_VTY_H
+#define _ZEBRA_VTY_H
+
+#define VTY_BUFSIZ 512
+#define VTY_MAXHIST 20
+
+/* VTY struct. */
+struct vty 
+{
+  /* File descripter of this vty. */
+  int fd;
+
+  /* Is this vty connect to file or not */
+  enum {VTY_TERM, VTY_FILE, VTY_SHELL, VTY_SHELL_SERV} type;
+
+  /* Node status of this vty */
+  int node;
+
+  /* What address is this vty comming from. */
+  char *address;
+
+  /* Privilege level of this vty. */
+  int privilege;
+
+  /* Failure count */
+  int fail;
+
+  /* Output buffer. */
+  struct buffer *obuf;
+
+  /* Command input buffer */
+  char *buf;
+
+  /* Command cursor point */
+  int cp;
+
+  /* Command length */
+  int length;
+
+  /* Command max length. */
+  int max;
+
+  /* Histry of command */
+  char *hist[VTY_MAXHIST];
+
+  /* History lookup current point */
+  int hp;
+
+  /* History insert end point */
+  int hindex;
+
+  /* For current referencing point of interface, route-map,
+     access-list etc... */
+  void *index;
+
+  /* For multiple level index treatment such as key chain and key. */
+  void *index_sub;
+
+  /* For escape character. */
+  unsigned char escape;
+
+  /* Current vty status. */
+  enum {VTY_NORMAL, VTY_CLOSE, VTY_MORE, VTY_MORELINE,
+        VTY_START, VTY_CONTINUE} status;
+
+  /* IAC handling */
+  unsigned char iac;
+
+  /* IAC SB handling */
+  unsigned char iac_sb_in_progress;
+  struct buffer *sb_buffer;
+
+  /* Window width/height. */
+  int width;
+  int height;
+
+  int scroll_one;
+
+  /* Configure lines. */
+  int lines;
+
+  /* Current executing function pointer. */
+  int (*func) (struct vty *, void *arg);
+
+  /* Terminal monitor. */
+  int monitor;
+
+  /* In configure mode. */
+  int config;
+
+  /* Read and write thread. */
+  struct thread *t_read;
+  struct thread *t_write;
+
+  /* Timeout seconds and thread. */
+  unsigned long v_timeout;
+  struct thread *t_timeout;
+
+  /* Thread output function. */
+  struct thread *t_output;
+
+  /* Output data pointer. */
+  int (*output_func) (struct vty *, int);
+  void (*output_clean) (struct vty *);
+  void *output_rn;
+  unsigned long output_count;
+  int output_type;
+  void *output_arg;
+};
+
+/* Integrated configuration file. */
+#define INTEGRATE_DEFAULT_CONFIG "Zebra.conf"
+
+/* Small macro to determine newline is newline only or linefeed needed. */
+#define VTY_NEWLINE  ((vty->type == VTY_TERM) ? "\r\n" : "\n")
+
+/* Default time out value */
+#define VTY_TIMEOUT_DEFAULT 600
+
+/* Vty read buffer size. */
+#define VTY_READ_BUFSIZ 512
+
+/* Directory separator. */
+#ifndef DIRECTORY_SEP
+#define DIRECTORY_SEP '/'
+#endif /* DIRECTORY_SEP */
+
+#ifndef IS_DIRECTORY_SEP
+#define IS_DIRECTORY_SEP(c) ((c) == DIRECTORY_SEP)
+#endif
+
+/* GCC have printf type attribute check.  */
+#ifdef __GNUC__
+#define PRINTF_ATTRIBUTE(a,b) __attribute__ ((__format__ (__printf__, a, b)))
+#else
+#define PRINTF_ATTRIBUTE(a,b)
+#endif /* __GNUC__ */
+
+/* Utility macro to convert VTY argument to unsigned integer.  */
+#define VTY_GET_INTEGER(NAME,V,STR)                              \
+{                                                                \
+  char *endptr = NULL;                                           \
+  (V) = strtoul ((STR), &endptr, 10);                            \
+  if ((V) == ULONG_MAX || *endptr != '\0')                       \
+    {                                                            \
+      vty_out (vty, "%% Invalid %s value%s", NAME, VTY_NEWLINE); \
+      return CMD_WARNING;                                        \
+    }                                                            \
+}
+
+#define VTY_GET_INTEGER_RANGE(NAME,V,STR,MIN,MAX)                \
+{                                                                \
+  char *endptr = NULL;                                           \
+  (V) = strtoul ((STR), &endptr, 10);                            \
+  if ((V) == ULONG_MAX || *endptr != '\0'                        \
+      || (V) < (MIN) || (V) > (MAX))                             \
+    {                                                            \
+      vty_out (vty, "%% Invalid %s value%s", NAME, VTY_NEWLINE); \
+      return CMD_WARNING;                                        \
+    }                                                            \
+}
+
+/* Exported variables */
+extern char integrate_default[];
+
+/* Prototypes. */
+void vty_init (void);
+void vty_init_vtysh (void);
+void vty_reset (void);
+void vty_finish (void);
+struct vty *vty_new (void);
+int vty_out (struct vty *, const char *, ...) PRINTF_ATTRIBUTE(2, 3);
+void vty_read_config (char *, char *, char *);
+void vty_time_print (struct vty *, int);
+void vty_serv_sock (const char *, unsigned short, char *);
+void vty_close (struct vty *);
+char *vty_get_cwd (void);
+void vty_log (const char *, const char *, va_list);
+int vty_config_lock (struct vty *);
+int vty_config_unlock (struct vty *);
+int vty_shell (struct vty *);
+int vty_shell_serv (struct vty *);
+void vty_hello (struct vty *);
+
+#endif /* _ZEBRA_VTY_H */