diff --git a/lib/zclient.h b/lib/zclient.h
new file mode 100644
index 0000000..66307c9
--- /dev/null
+++ b/lib/zclient.h
@@ -0,0 +1,164 @@
+/* Zebra's client header.
+ * Copyright (C) 1999 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_ZCLIENT_H
+#define _ZEBRA_ZCLIENT_H
+
+/* For struct interface and struct connected. */
+#include "if.h"
+
+/* For input/output buffer to zebra. */
+#define ZEBRA_MAX_PACKET_SIZ          4096
+
+/* Zebra header size. */
+#define ZEBRA_HEADER_SIZE                3
+
+/* Structure for the zebra client. */
+struct zclient
+{
+  /* Socket to zebra daemon. */
+  int sock;
+
+  /* Flag of communication to zebra is enabled or not.  Default is on.
+     This flag is disabled by `no router zebra' statement. */
+  int enable;
+
+  /* Connection failure count. */
+  int fail;
+
+  /* Input buffer for zebra message. */
+  struct stream *ibuf;
+
+  /* Output buffer for zebra message. */
+  struct stream *obuf;
+
+  /* Read and connect thread. */
+  struct thread *t_read;
+  struct thread *t_connect;
+
+  /* Redistribute information. */
+  u_char redist_default;
+  u_char redist[ZEBRA_ROUTE_MAX];
+
+  /* Redistribute defauilt. */
+  u_char default_information;
+
+  /* Pointer to the callback functions. */
+  int (*interface_add) (int, struct zclient *, zebra_size_t);
+  int (*interface_delete) (int, struct zclient *, zebra_size_t);
+  int (*interface_up) (int, struct zclient *, zebra_size_t);
+  int (*interface_down) (int, struct zclient *, zebra_size_t);
+  int (*interface_address_add) (int, struct zclient *, zebra_size_t);
+  int (*interface_address_delete) (int, struct zclient *, zebra_size_t);
+  int (*ipv4_route_add) (int, struct zclient *, zebra_size_t);
+  int (*ipv4_route_delete) (int, struct zclient *, zebra_size_t);
+  int (*ipv6_route_add) (int, struct zclient *, zebra_size_t);
+  int (*ipv6_route_delete) (int, struct zclient *, zebra_size_t);
+};
+
+/* Zebra API message flag. */
+#define ZAPI_MESSAGE_NEXTHOP  0x01
+#define ZAPI_MESSAGE_IFINDEX  0x02
+#define ZAPI_MESSAGE_DISTANCE 0x04
+#define ZAPI_MESSAGE_METRIC   0x08
+
+/* Zebra IPv4 route message API. */
+struct zapi_ipv4
+{
+  u_char type;
+
+  u_char flags;
+
+  u_char message;
+
+  u_char nexthop_num;
+  struct in_addr **nexthop;
+
+  u_char ifindex_num;
+  unsigned int *ifindex;
+
+  u_char distance;
+
+  u_int32_t metric;
+};
+
+int
+zapi_ipv4_add (struct zclient *, struct prefix_ipv4 *, struct zapi_ipv4 *);
+
+int
+zapi_ipv4_delete (struct zclient *, struct prefix_ipv4 *, struct zapi_ipv4 *);
+
+/* Prototypes of zebra client service functions. */
+struct zclient *zclient_new (void);
+void zclient_free (struct zclient *);
+void zclient_init (struct zclient *, int);
+int zclient_start (struct zclient *);
+void zclient_stop (struct zclient *);
+void zclient_reset (struct zclient *);
+int zclient_socket ();
+int zclient_socket_un (char *);
+
+void zclient_redistribute_set (struct zclient *, int);
+void zclient_redistribute_unset (struct zclient *, int);
+
+void zclient_redistribute_default_set (struct zclient *);
+void zclient_redistribute_default_unset (struct zclient *);
+
+/* struct zebra *zebra_new (); */
+int zebra_redistribute_send (int, int, int);
+
+struct interface *zebra_interface_add_read (struct stream *);
+struct interface *zebra_interface_state_read (struct stream *s);
+struct connected *zebra_interface_address_add_read (struct stream *);
+struct connected *zebra_interface_address_delete_read (struct stream *);
+
+#ifdef HAVE_IPV6
+/* IPv6 prefix add and delete function prototype. */
+
+struct zapi_ipv6
+{
+  u_char type;
+
+  u_char flags;
+
+  u_char message;
+
+  u_char nexthop_num;
+  struct in6_addr **nexthop;
+
+  u_char ifindex_num;
+  unsigned int *ifindex;
+
+  u_char distance;
+
+  u_int32_t metric;
+};
+
+int
+zapi_ipv6_add (struct zclient *zclient, struct prefix_ipv6 *p,
+	       struct zapi_ipv6 *api);
+int
+zapi_ipv6_delete (struct zclient *zclient, struct prefix_ipv6 *p,
+		  struct zapi_ipv6 *api);
+
+#endif /* HAVE_IPV6 */
+
+#endif /* _ZEBRA_ZCLIENT_H */