diff --git a/src/Makefile.am b/src/Makefile.am
index 412e1e3..3847af3 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -2,7 +2,7 @@
 AM_CFLAGS=-Wall
 
 sbin_PROGRAMS = bsc_hack bs11_config ipaccess-find
-noinst_LIBRARIES = libbsc.a
+noinst_LIBRARIES = libbsc.a libvty.a
 
 libbsc_a_SOURCES = abis_rsl.c abis_nm.c gsm_04_08.c gsm_data.c \
 		gsm_subscriber.c msgb.c select.c chan_alloc.c timer.c debug.c db.c \
@@ -10,6 +10,8 @@
 		trau_frame.c trau_mux.c paging.c e1_config.c e1_input.c tlv_parser.c \
 		input/misdn.c input/ipaccess.c signal.c gsm_utils.c
 
+libvty_a_SOURCES = vty/buffer.c vty/command.c vty/vector.c vty/vty.c
+
 bsc_hack_SOURCES = bsc_hack.c
 bsc_hack_LDADD = libbsc.a -ldl -ldbi
 
diff --git a/src/vty/buffer.c b/src/vty/buffer.c
new file mode 100644
index 0000000..6366100
--- /dev/null
+++ b/src/vty/buffer.c
@@ -0,0 +1,460 @@
+/*
+ * Buffering of output and input.
+ * Copyright (C) 1998 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.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <stddef.h>
+#include <sys/uio.h>
+
+#include <vty/buffer.h>
+#include <vty/vty.h>
+
+/* Buffer master. */
+struct buffer {
+	/* Data list. */
+	struct buffer_data *head;
+	struct buffer_data *tail;
+
+	/* Size of each buffer_data chunk. */
+	size_t size;
+};
+
+/* Data container. */
+struct buffer_data {
+	struct buffer_data *next;
+
+	/* Location to add new data. */
+	size_t cp;
+
+	/* Pointer to data not yet flushed. */
+	size_t sp;
+
+	/* Actual data stream (variable length). */
+	unsigned char data[0];	/* real dimension is buffer->size */
+};
+
+/* It should always be true that: 0 <= sp <= cp <= size */
+
+/* Default buffer size (used if none specified).  It is rounded up to the
+   next page boundery. */
+#define BUFFER_SIZE_DEFAULT		4096
+
+#define BUFFER_DATA_FREE(D) free((D))
+
+/* Make new buffer. */
+struct buffer *buffer_new(size_t size)
+{
+	struct buffer *b;
+
+	b = calloc(1, sizeof(struct buffer));
+
+	if (size)
+		b->size = size;
+	else {
+		static size_t default_size;
+		if (!default_size) {
+			long pgsz = sysconf(_SC_PAGESIZE);
+			default_size =
+			    ((((BUFFER_SIZE_DEFAULT - 1) / pgsz) + 1) * pgsz);
+		}
+		b->size = default_size;
+	}
+
+	return b;
+}
+
+/* Free buffer. */
+void buffer_free(struct buffer *b)
+{
+	buffer_reset(b);
+	free(b);
+}
+
+/* Make string clone. */
+char *buffer_getstr(struct buffer *b)
+{
+	size_t totlen = 0;
+	struct buffer_data *data;
+	char *s;
+	char *p;
+
+	for (data = b->head; data; data = data->next)
+		totlen += data->cp - data->sp;
+	if (!(s = malloc(totlen + 1)))
+		return NULL;
+	p = s;
+	for (data = b->head; data; data = data->next) {
+		memcpy(p, data->data + data->sp, data->cp - data->sp);
+		p += data->cp - data->sp;
+	}
+	*p = '\0';
+	return s;
+}
+
+/* Return 1 if buffer is empty. */
+int buffer_empty(struct buffer *b)
+{
+	return (b->head == NULL);
+}
+
+/* Clear and free all allocated data. */
+void buffer_reset(struct buffer *b)
+{
+	struct buffer_data *data;
+	struct buffer_data *next;
+
+	for (data = b->head; data; data = next) {
+		next = data->next;
+		BUFFER_DATA_FREE(data);
+	}
+	b->head = b->tail = NULL;
+}
+
+/* Add buffer_data to the end of buffer. */
+static struct buffer_data *buffer_add(struct buffer *b)
+{
+	struct buffer_data *d;
+
+	d = malloc(offsetof(struct buffer_data, data[b->size]));
+	if (!d)
+		return NULL;
+	d->cp = d->sp = 0;
+	d->next = NULL;
+
+	if (b->tail)
+		b->tail->next = d;
+	else
+		b->head = d;
+	b->tail = d;
+
+	return d;
+}
+
+/* Write data to buffer. */
+void buffer_put(struct buffer *b, const void *p, size_t size)
+{
+	struct buffer_data *data = b->tail;
+	const char *ptr = p;
+
+	/* We use even last one byte of data buffer. */
+	while (size) {
+		size_t chunk;
+
+		/* If there is no data buffer add it. */
+		if (data == NULL || data->cp == b->size)
+			data = buffer_add(b);
+
+		chunk =
+		    ((size <=
+		      (b->size - data->cp)) ? size : (b->size - data->cp));
+		memcpy((data->data + data->cp), ptr, chunk);
+		size -= chunk;
+		ptr += chunk;
+		data->cp += chunk;
+	}
+}
+
+/* Insert character into the buffer. */
+void buffer_putc(struct buffer *b, u_char c)
+{
+	buffer_put(b, &c, 1);
+}
+
+/* Put string to the buffer. */
+void buffer_putstr(struct buffer *b, const char *c)
+{
+	buffer_put(b, c, strlen(c));
+}
+
+/* Keep flushing data to the fd until the buffer is empty or an error is
+   encountered or the operation would block. */
+buffer_status_t buffer_flush_all(struct buffer *b, int fd)
+{
+	buffer_status_t ret;
+	struct buffer_data *head;
+	size_t head_sp;
+
+	if (!b->head)
+		return BUFFER_EMPTY;
+	head_sp = (head = b->head)->sp;
+	/* Flush all data. */
+	while ((ret = buffer_flush_available(b, fd)) == BUFFER_PENDING) {
+		if ((b->head == head) && (head_sp == head->sp)
+		    && (errno != EINTR))
+			/* No data was flushed, so kernel buffer must be full. */
+			return ret;
+		head_sp = (head = b->head)->sp;
+	}
+
+	return ret;
+}
+
+#if 0
+/* Flush enough data to fill a terminal window of the given scene (used only
+   by vty telnet interface). */
+buffer_status_t
+buffer_flush_window(struct buffer * b, int fd, int width, int height,
+		    int erase_flag, int no_more_flag)
+{
+	int nbytes;
+	int iov_alloc;
+	int iov_index;
+	struct iovec *iov;
+	struct iovec small_iov[3];
+	char more[] = " --More-- ";
+	char erase[] =
+	    { 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
+		' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ',
+		0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08
+	};
+	struct buffer_data *data;
+	int column;
+
+	if (!b->head)
+		return BUFFER_EMPTY;
+
+	if (height < 1) {
+		zlog_warn
+		    ("%s called with non-positive window height %d, forcing to 1",
+		     __func__, height);
+		height = 1;
+	} else if (height >= 2)
+		height--;
+	if (width < 1) {
+		zlog_warn
+		    ("%s called with non-positive window width %d, forcing to 1",
+		     __func__, width);
+		width = 1;
+	}
+
+	/* For erase and more data add two to b's buffer_data count. */
+	if (b->head->next == NULL) {
+		iov_alloc = sizeof(small_iov) / sizeof(small_iov[0]);
+		iov = small_iov;
+	} else {
+		iov_alloc = ((height * (width + 2)) / b->size) + 10;
+		iov = XMALLOC(MTYPE_TMP, iov_alloc * sizeof(*iov));
+	}
+	iov_index = 0;
+
+	/* Previously print out is performed. */
+	if (erase_flag) {
+		iov[iov_index].iov_base = erase;
+		iov[iov_index].iov_len = sizeof erase;
+		iov_index++;
+	}
+
+	/* Output data. */
+	column = 1;		/* Column position of next character displayed. */
+	for (data = b->head; data && (height > 0); data = data->next) {
+		size_t cp;
+
+		cp = data->sp;
+		while ((cp < data->cp) && (height > 0)) {
+			/* Calculate lines remaining and column position after displaying
+			   this character. */
+			if (data->data[cp] == '\r')
+				column = 1;
+			else if ((data->data[cp] == '\n') || (column == width)) {
+				column = 1;
+				height--;
+			} else
+				column++;
+			cp++;
+		}
+		iov[iov_index].iov_base = (char *)(data->data + data->sp);
+		iov[iov_index++].iov_len = cp - data->sp;
+		data->sp = cp;
+
+		if (iov_index == iov_alloc)
+			/* This should not ordinarily happen. */
+		{
+			iov_alloc *= 2;
+			if (iov != small_iov) {
+				zlog_warn("%s: growing iov array to %d; "
+					  "width %d, height %d, size %lu",
+					  __func__, iov_alloc, width, height,
+					  (u_long) b->size);
+				iov =
+				    XREALLOC(MTYPE_TMP, iov,
+					     iov_alloc * sizeof(*iov));
+			} else {
+				/* This should absolutely never occur. */
+				zlog_err
+				    ("%s: corruption detected: iov_small overflowed; "
+				     "head %p, tail %p, head->next %p",
+				     __func__, b->head, b->tail, b->head->next);
+				iov =
+				    XMALLOC(MTYPE_TMP,
+					    iov_alloc * sizeof(*iov));
+				memcpy(iov, small_iov, sizeof(small_iov));
+			}
+		}
+	}
+
+	/* In case of `more' display need. */
+	if (b->tail && (b->tail->sp < b->tail->cp) && !no_more_flag) {
+		iov[iov_index].iov_base = more;
+		iov[iov_index].iov_len = sizeof more;
+		iov_index++;
+	}
+#ifdef IOV_MAX
+	/* IOV_MAX are normally defined in <sys/uio.h> , Posix.1g.
+	   example: Solaris2.6 are defined IOV_MAX size at 16.     */
+	{
+		struct iovec *c_iov = iov;
+		nbytes = 0;	/* Make sure it's initialized. */
+
+		while (iov_index > 0) {
+			int iov_size;
+
+			iov_size =
+			    ((iov_index > IOV_MAX) ? IOV_MAX : iov_index);
+			if ((nbytes = writev(fd, c_iov, iov_size)) < 0) {
+				zlog_warn("%s: writev to fd %d failed: %s",
+					  __func__, fd, safe_strerror(errno));
+				break;
+			}
+
+			/* move pointer io-vector */
+			c_iov += iov_size;
+			iov_index -= iov_size;
+		}
+	}
+#else				/* IOV_MAX */
+	if ((nbytes = writev(fd, iov, iov_index)) < 0)
+		zlog_warn("%s: writev to fd %d failed: %s",
+			  __func__, fd, safe_strerror(errno));
+#endif				/* IOV_MAX */
+
+	/* Free printed buffer data. */
+	while (b->head && (b->head->sp == b->head->cp)) {
+		struct buffer_data *del;
+		if (!(b->head = (del = b->head)->next))
+			b->tail = NULL;
+		BUFFER_DATA_FREE(del);
+	}
+
+	if (iov != small_iov)
+		XFREE(MTYPE_TMP, iov);
+
+	return (nbytes < 0) ? BUFFER_ERROR :
+	    (b->head ? BUFFER_PENDING : BUFFER_EMPTY);
+}
+#endif
+
+/* This function (unlike other buffer_flush* functions above) is designed
+to work with non-blocking sockets.  It does not attempt to write out
+all of the queued data, just a "big" chunk.  It returns 0 if it was
+able to empty out the buffers completely, 1 if more flushing is
+required later, or -1 on a fatal write error. */
+buffer_status_t buffer_flush_available(struct buffer * b, int fd)
+{
+
+/* These are just reasonable values to make sure a significant amount of
+data is written.  There's no need to go crazy and try to write it all
+in one shot. */
+#ifdef IOV_MAX
+#define MAX_CHUNKS ((IOV_MAX >= 16) ? 16 : IOV_MAX)
+#else
+#define MAX_CHUNKS 16
+#endif
+#define MAX_FLUSH 131072
+
+	struct buffer_data *d;
+	size_t written;
+	struct iovec iov[MAX_CHUNKS];
+	size_t iovcnt = 0;
+	size_t nbyte = 0;
+
+	for (d = b->head; d && (iovcnt < MAX_CHUNKS) && (nbyte < MAX_FLUSH);
+	     d = d->next, iovcnt++) {
+		iov[iovcnt].iov_base = d->data + d->sp;
+		nbyte += (iov[iovcnt].iov_len = d->cp - d->sp);
+	}
+
+	if (!nbyte)
+		/* No data to flush: should we issue a warning message? */
+		return BUFFER_EMPTY;
+
+	/* only place where written should be sign compared */
+	if ((ssize_t) (written = writev(fd, iov, iovcnt)) < 0) {
+		if (ERRNO_IO_RETRY(errno))
+			/* Calling code should try again later. */
+			return BUFFER_PENDING;
+		return BUFFER_ERROR;
+	}
+
+	/* Free printed buffer data. */
+	while (written > 0) {
+		struct buffer_data *d;
+		if (!(d = b->head))
+			break;
+		if (written < d->cp - d->sp) {
+			d->sp += written;
+			return BUFFER_PENDING;
+		}
+
+		written -= (d->cp - d->sp);
+		if (!(b->head = d->next))
+			b->tail = NULL;
+		BUFFER_DATA_FREE(d);
+	}
+
+	return b->head ? BUFFER_PENDING : BUFFER_EMPTY;
+
+#undef MAX_CHUNKS
+#undef MAX_FLUSH
+}
+
+buffer_status_t
+buffer_write(struct buffer * b, int fd, const void *p, size_t size)
+{
+	ssize_t nbytes;
+
+#if 0
+	/* Should we attempt to drain any previously buffered data?  This could help reduce latency in pushing out the data if we are stuck in a long-running thread that is preventing the main select loop from calling the flush thread... */
+
+	if (b->head && (buffer_flush_available(b, fd) == BUFFER_ERROR))
+		return BUFFER_ERROR;
+#endif
+	if (b->head)
+		/* Buffer is not empty, so do not attempt to write the new data. */
+		nbytes = 0;
+	else if ((nbytes = write(fd, p, size)) < 0) {
+		if (ERRNO_IO_RETRY(errno))
+			nbytes = 0;
+		else
+			return BUFFER_ERROR;
+	}
+	/* Add any remaining data to the buffer. */
+	{
+		size_t written = nbytes;
+		if (written < size)
+			buffer_put(b, ((const char *)p) + written,
+				   size - written);
+	}
+	return b->head ? BUFFER_PENDING : BUFFER_EMPTY;
+}
diff --git a/src/vty/cardshell.h b/src/vty/cardshell.h
new file mode 100644
index 0000000..d963a38
--- /dev/null
+++ b/src/vty/cardshell.h
@@ -0,0 +1,5 @@
+#define QUAGGA_PROGNAME	"OpenBSC"
+#define QUAGGA_VERSION	"0.01"
+#define QUAGGA_COPYRIGHT "Harald Welte <laforge@gnumonks.org>"
+#define CONFIGFILE_MASK 022
+#define SYSCONFDIR "/usr/local/etc"
diff --git a/src/vty/command.c b/src/vty/command.c
new file mode 100644
index 0000000..aac0c9b
--- /dev/null
+++ b/src/vty/command.c
@@ -0,0 +1,3390 @@
+/*
+   $Id: command.c,v 1.47 2005/04/25 16:26:42 paul Exp $
+
+   Command interpreter routine for virtual terminal [aka TeletYpe]
+   Copyright (C) 1997, 98, 99 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.  */
+
+#include "cardshell.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <errno.h>
+#define _XOPEN_SOURCE
+#include <unistd.h>
+#include <assert.h>
+#include <ctype.h>
+#include <time.h>
+#include <sys/time.h>
+
+//#include "memory.h"
+//#include "log.h"
+//#include <lib/version.h>
+//#include "thread.h"
+#include <vty/vector.h>
+#include <vty/vty.h>
+#include <vty/command.h>
+//#include "workqueue.h"
+
+/* Command vector which includes some level of command lists. Normally
+   each daemon maintains each own cmdvec. */
+vector cmdvec;
+
+/* Host information structure. */
+struct host host;
+
+/* Standard command node structures. */
+struct cmd_node auth_node = {
+	AUTH_NODE,
+	"Password: ",
+};
+
+struct cmd_node view_node = {
+	VIEW_NODE,
+	"%s> ",
+};
+
+struct cmd_node auth_enable_node = {
+	AUTH_ENABLE_NODE,
+	"Password: ",
+};
+
+struct cmd_node enable_node = {
+	ENABLE_NODE,
+	"%s# ",
+};
+
+struct cmd_node config_node = {
+	CONFIG_NODE,
+	"%s(config)# ",
+	1
+};
+
+/* Default motd string. */
+const char *default_motd = "\r\n\
+Hello, this is " QUAGGA_PROGNAME " (version " QUAGGA_VERSION ").\r\n\
+" QUAGGA_COPYRIGHT "\r\n\
+\r\n";
+
+#if 0
+static struct facility_map {
+	int facility;
+	const char *name;
+	size_t match;
+} syslog_facilities[] = {
+	{
+	LOG_KERN, "kern", 1}, {
+	LOG_USER, "user", 2}, {
+	LOG_MAIL, "mail", 1}, {
+	LOG_DAEMON, "daemon", 1}, {
+	LOG_AUTH, "auth", 1}, {
+	LOG_SYSLOG, "syslog", 1}, {
+	LOG_LPR, "lpr", 2}, {
+	LOG_NEWS, "news", 1}, {
+	LOG_UUCP, "uucp", 2}, {
+	LOG_CRON, "cron", 1},
+#ifdef LOG_FTP
+	{
+	LOG_FTP, "ftp", 1},
+#endif
+	{
+	LOG_LOCAL0, "local0", 6}, {
+	LOG_LOCAL1, "local1", 6}, {
+	LOG_LOCAL2, "local2", 6}, {
+	LOG_LOCAL3, "local3", 6}, {
+	LOG_LOCAL4, "local4", 6}, {
+	LOG_LOCAL5, "local5", 6}, {
+	LOG_LOCAL6, "local6", 6}, {
+	LOG_LOCAL7, "local7", 6}, {
+0, NULL, 0},};
+
+static const char *facility_name(int facility)
+{
+	struct facility_map *fm;
+
+	for (fm = syslog_facilities; fm->name; fm++)
+		if (fm->facility == facility)
+			return fm->name;
+	return "";
+}
+
+static int facility_match(const char *str)
+{
+	struct facility_map *fm;
+
+	for (fm = syslog_facilities; fm->name; fm++)
+		if (!strncmp(str, fm->name, fm->match))
+			return fm->facility;
+	return -1;
+}
+
+static int level_match(const char *s)
+{
+	int level;
+
+	for (level = 0; zlog_priority[level] != NULL; level++)
+		if (!strncmp(s, zlog_priority[level], 2))
+			return level;
+	return ZLOG_DISABLED;
+}
+#endif
+
+/* This is called from main when a daemon is invoked with -v or --version. */
+void print_version(const char *progname)
+{
+	printf("%s version %s\n", progname, QUAGGA_VERSION);
+	printf("%s\n", QUAGGA_COPYRIGHT);
+}
+
+/* Utility function to concatenate argv argument into a single string
+   with inserting ' ' character between each argument.  */
+char *argv_concat(const char **argv, int argc, int shift)
+{
+	int i;
+	size_t len;
+	char *str;
+	char *p;
+
+	len = 0;
+	for (i = shift; i < argc; i++)
+		len += strlen(argv[i]) + 1;
+	if (!len)
+		return NULL;
+	p = str = malloc(len);
+	for (i = shift; i < argc; i++) {
+		size_t arglen;
+		memcpy(p, argv[i], (arglen = strlen(argv[i])));
+		p += arglen;
+		*p++ = ' ';
+	}
+	*(p - 1) = '\0';
+	return str;
+}
+
+/* Install top node of command vector. */
+void install_node(struct cmd_node *node, int (*func) (struct vty *))
+{
+	vector_set_index(cmdvec, node->node, node);
+	node->func = func;
+	node->cmd_vector = vector_init(VECTOR_MIN_SIZE);
+}
+
+/* Compare two command's string.  Used in sort_node (). */
+static int cmp_node(const void *p, const void *q)
+{
+	struct cmd_element *a = *(struct cmd_element **)p;
+	struct cmd_element *b = *(struct cmd_element **)q;
+
+	return strcmp(a->string, b->string);
+}
+
+static int cmp_desc(const void *p, const void *q)
+{
+	struct desc *a = *(struct desc **)p;
+	struct desc *b = *(struct desc **)q;
+
+	return strcmp(a->cmd, b->cmd);
+}
+
+/* Sort each node's command element according to command string. */
+void sort_node()
+{
+	unsigned int i, j;
+	struct cmd_node *cnode;
+	vector descvec;
+	struct cmd_element *cmd_element;
+
+	for (i = 0; i < vector_active(cmdvec); i++)
+		if ((cnode = vector_slot(cmdvec, i)) != NULL) {
+			vector cmd_vector = cnode->cmd_vector;
+			qsort(cmd_vector->index, vector_active(cmd_vector),
+			      sizeof(void *), cmp_node);
+
+			for (j = 0; j < vector_active(cmd_vector); j++)
+				if ((cmd_element =
+				     vector_slot(cmd_vector, j)) != NULL
+				    && vector_active(cmd_element->strvec)) {
+					descvec =
+					    vector_slot(cmd_element->strvec,
+							vector_active
+							(cmd_element->strvec) -
+							1);
+					qsort(descvec->index,
+					      vector_active(descvec),
+					      sizeof(void *), cmp_desc);
+				}
+		}
+}
+
+/* Breaking up string into each command piece. I assume given
+   character is separated by a space character. Return value is a
+   vector which includes char ** data element. */
+vector cmd_make_strvec(const char *string)
+{
+	const char *cp, *start;
+	char *token;
+	int strlen;
+	vector strvec;
+
+	if (string == NULL)
+		return NULL;
+
+	cp = string;
+
+	/* Skip white spaces. */
+	while (isspace((int)*cp) && *cp != '\0')
+		cp++;
+
+	/* Return if there is only white spaces */
+	if (*cp == '\0')
+		return NULL;
+
+	if (*cp == '!' || *cp == '#')
+		return NULL;
+
+	/* Prepare return vector. */
+	strvec = vector_init(VECTOR_MIN_SIZE);
+
+	/* Copy each command piece and set into vector. */
+	while (1) {
+		start = cp;
+		while (!(isspace((int)*cp) || *cp == '\r' || *cp == '\n') &&
+		       *cp != '\0')
+			cp++;
+		strlen = cp - start;
+		token = malloc(strlen + 1);
+		memcpy(token, start, strlen);
+		*(token + strlen) = '\0';
+		vector_set(strvec, token);
+
+		while ((isspace((int)*cp) || *cp == '\n' || *cp == '\r') &&
+		       *cp != '\0')
+			cp++;
+
+		if (*cp == '\0')
+			return strvec;
+	}
+}
+
+/* Free allocated string vector. */
+void cmd_free_strvec(vector v)
+{
+	unsigned int i;
+	char *cp;
+
+	if (!v)
+		return;
+
+	for (i = 0; i < vector_active(v); i++)
+		if ((cp = vector_slot(v, i)) != NULL)
+			free(cp);
+
+	vector_free(v);
+}
+
+/* Fetch next description.  Used in cmd_make_descvec(). */
+static char *cmd_desc_str(const char **string)
+{
+	const char *cp, *start;
+	char *token;
+	int strlen;
+
+	cp = *string;
+
+	if (cp == NULL)
+		return NULL;
+
+	/* Skip white spaces. */
+	while (isspace((int)*cp) && *cp != '\0')
+		cp++;
+
+	/* Return if there is only white spaces */
+	if (*cp == '\0')
+		return NULL;
+
+	start = cp;
+
+	while (!(*cp == '\r' || *cp == '\n') && *cp != '\0')
+		cp++;
+
+	strlen = cp - start;
+	token = malloc(strlen + 1);
+	memcpy(token, start, strlen);
+	*(token + strlen) = '\0';
+
+	*string = cp;
+
+	return token;
+}
+
+/* New string vector. */
+static vector cmd_make_descvec(const char *string, const char *descstr)
+{
+	int multiple = 0;
+	const char *sp;
+	char *token;
+	int len;
+	const char *cp;
+	const char *dp;
+	vector allvec;
+	vector strvec = NULL;
+	struct desc *desc;
+
+	cp = string;
+	dp = descstr;
+
+	if (cp == NULL)
+		return NULL;
+
+	allvec = vector_init(VECTOR_MIN_SIZE);
+
+	while (1) {
+		while (isspace((int)*cp) && *cp != '\0')
+			cp++;
+
+		if (*cp == '(') {
+			multiple = 1;
+			cp++;
+		}
+		if (*cp == ')') {
+			multiple = 0;
+			cp++;
+		}
+		if (*cp == '|') {
+			if (!multiple) {
+				fprintf(stderr, "Command parse error!: %s\n",
+					string);
+				exit(1);
+			}
+			cp++;
+		}
+
+		while (isspace((int)*cp) && *cp != '\0')
+			cp++;
+
+		if (*cp == '(') {
+			multiple = 1;
+			cp++;
+		}
+
+		if (*cp == '\0')
+			return allvec;
+
+		sp = cp;
+
+		while (!
+		       (isspace((int)*cp) || *cp == '\r' || *cp == '\n'
+			|| *cp == ')' || *cp == '|') && *cp != '\0')
+			cp++;
+
+		len = cp - sp;
+
+		token = malloc(len + 1);
+		memcpy(token, sp, len);
+		*(token + len) = '\0';
+
+		desc = calloc(1, sizeof(struct desc));
+		desc->cmd = token;
+		desc->str = cmd_desc_str(&dp);
+
+		if (multiple) {
+			if (multiple == 1) {
+				strvec = vector_init(VECTOR_MIN_SIZE);
+				vector_set(allvec, strvec);
+			}
+			multiple++;
+		} else {
+			strvec = vector_init(VECTOR_MIN_SIZE);
+			vector_set(allvec, strvec);
+		}
+		vector_set(strvec, desc);
+	}
+}
+
+/* Count mandantory string vector size.  This is to determine inputed
+   command has enough command length. */
+static int cmd_cmdsize(vector strvec)
+{
+	unsigned int i;
+	int size = 0;
+	vector descvec;
+	struct desc *desc;
+
+	for (i = 0; i < vector_active(strvec); i++)
+		if ((descvec = vector_slot(strvec, i)) != NULL) {
+			if ((vector_active(descvec)) == 1
+			    && (desc = vector_slot(descvec, 0)) != NULL) {
+				if (desc->cmd == NULL || CMD_OPTION(desc->cmd))
+					return size;
+				else
+					size++;
+			} else
+				size++;
+		}
+	return size;
+}
+
+/* Return prompt character of specified node. */
+const char *cmd_prompt(enum node_type node)
+{
+	struct cmd_node *cnode;
+
+	cnode = vector_slot(cmdvec, node);
+	return cnode->prompt;
+}
+
+/* Install a command into a node. */
+void install_element(enum node_type ntype, struct cmd_element *cmd)
+{
+	struct cmd_node *cnode;
+
+	cnode = vector_slot(cmdvec, ntype);
+
+	if (cnode == NULL) {
+		fprintf(stderr,
+			"Command node %d doesn't exist, please check it\n",
+			ntype);
+		exit(1);
+	}
+
+	vector_set(cnode->cmd_vector, cmd);
+
+	cmd->strvec = cmd_make_descvec(cmd->string, cmd->doc);
+	cmd->cmdsize = cmd_cmdsize(cmd->strvec);
+}
+
+static unsigned char itoa64[] =
+    "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+
+static void to64(char *s, long v, int n)
+{
+	while (--n >= 0) {
+		*s++ = itoa64[v & 0x3f];
+		v >>= 6;
+	}
+}
+
+static char *zencrypt(const char *passwd)
+{
+	char salt[6];
+	struct timeval tv;
+	char *crypt(const char *, const char *);
+
+	gettimeofday(&tv, 0);
+
+	to64(&salt[0], random(), 3);
+	to64(&salt[3], tv.tv_usec, 3);
+	salt[5] = '\0';
+
+	return crypt(passwd, salt);
+}
+
+/* This function write configuration of this host. */
+static int config_write_host(struct vty *vty)
+{
+#if 0
+	if (host.name)
+		vty_out(vty, "hostname %s%s", host.name, VTY_NEWLINE);
+
+	if (host.encrypt) {
+		if (host.password_encrypt)
+			vty_out(vty, "password 8 %s%s", host.password_encrypt,
+				VTY_NEWLINE);
+		if (host.enable_encrypt)
+			vty_out(vty, "enable password 8 %s%s",
+				host.enable_encrypt, VTY_NEWLINE);
+	} else {
+		if (host.password)
+			vty_out(vty, "password %s%s", host.password,
+				VTY_NEWLINE);
+		if (host.enable)
+			vty_out(vty, "enable password %s%s", host.enable,
+				VTY_NEWLINE);
+	}
+
+	if (zlog_default->default_lvl != LOG_DEBUG) {
+		vty_out(vty, "! N.B. The 'log trap' command is deprecated.%s",
+			VTY_NEWLINE);
+		vty_out(vty, "log trap %s%s",
+			zlog_priority[zlog_default->default_lvl], VTY_NEWLINE);
+	}
+
+	if (host.logfile
+	    && (zlog_default->maxlvl[ZLOG_DEST_FILE] != ZLOG_DISABLED)) {
+		vty_out(vty, "log file %s", host.logfile);
+		if (zlog_default->maxlvl[ZLOG_DEST_FILE] !=
+		    zlog_default->default_lvl)
+			vty_out(vty, " %s",
+				zlog_priority[zlog_default->
+					      maxlvl[ZLOG_DEST_FILE]]);
+		vty_out(vty, "%s", VTY_NEWLINE);
+	}
+
+	if (zlog_default->maxlvl[ZLOG_DEST_STDOUT] != ZLOG_DISABLED) {
+		vty_out(vty, "log stdout");
+		if (zlog_default->maxlvl[ZLOG_DEST_STDOUT] !=
+		    zlog_default->default_lvl)
+			vty_out(vty, " %s",
+				zlog_priority[zlog_default->
+					      maxlvl[ZLOG_DEST_STDOUT]]);
+		vty_out(vty, "%s", VTY_NEWLINE);
+	}
+
+	if (zlog_default->maxlvl[ZLOG_DEST_MONITOR] == ZLOG_DISABLED)
+		vty_out(vty, "no log monitor%s", VTY_NEWLINE);
+	else if (zlog_default->maxlvl[ZLOG_DEST_MONITOR] !=
+		 zlog_default->default_lvl)
+		vty_out(vty, "log monitor %s%s",
+			zlog_priority[zlog_default->maxlvl[ZLOG_DEST_MONITOR]],
+			VTY_NEWLINE);
+
+	if (zlog_default->maxlvl[ZLOG_DEST_SYSLOG] != ZLOG_DISABLED) {
+		vty_out(vty, "log syslog");
+		if (zlog_default->maxlvl[ZLOG_DEST_SYSLOG] !=
+		    zlog_default->default_lvl)
+			vty_out(vty, " %s",
+				zlog_priority[zlog_default->
+					      maxlvl[ZLOG_DEST_SYSLOG]]);
+		vty_out(vty, "%s", VTY_NEWLINE);
+	}
+
+	if (zlog_default->facility != LOG_DAEMON)
+		vty_out(vty, "log facility %s%s",
+			facility_name(zlog_default->facility), VTY_NEWLINE);
+
+	if (zlog_default->record_priority == 1)
+		vty_out(vty, "log record-priority%s", VTY_NEWLINE);
+
+	if (host.advanced)
+		vty_out(vty, "service advanced-vty%s", VTY_NEWLINE);
+
+	if (host.encrypt)
+		vty_out(vty, "service password-encryption%s", VTY_NEWLINE);
+
+	if (host.lines >= 0)
+		vty_out(vty, "service terminal-length %d%s", host.lines,
+			VTY_NEWLINE);
+
+	if (host.motdfile)
+		vty_out(vty, "banner motd file %s%s", host.motdfile,
+			VTY_NEWLINE);
+	else if (!host.motd)
+		vty_out(vty, "no banner motd%s", VTY_NEWLINE);
+
+#endif
+	return 1;
+}
+
+/* Utility function for getting command vector. */
+static vector cmd_node_vector(vector v, enum node_type ntype)
+{
+	struct cmd_node *cnode = vector_slot(v, ntype);
+	return cnode->cmd_vector;
+}
+
+#if 0
+/* Filter command vector by symbol.  This function is not actually used;
+ * should it be deleted? */
+static int cmd_filter_by_symbol(char *command, char *symbol)
+{
+	int i, lim;
+
+	if (strcmp(symbol, "IPV4_ADDRESS") == 0) {
+		i = 0;
+		lim = strlen(command);
+		while (i < lim) {
+			if (!
+			    (isdigit((int)command[i]) || command[i] == '.'
+			     || command[i] == '/'))
+				return 1;
+			i++;
+		}
+		return 0;
+	}
+	if (strcmp(symbol, "STRING") == 0) {
+		i = 0;
+		lim = strlen(command);
+		while (i < lim) {
+			if (!
+			    (isalpha((int)command[i]) || command[i] == '_'
+			     || command[i] == '-'))
+				return 1;
+			i++;
+		}
+		return 0;
+	}
+	if (strcmp(symbol, "IFNAME") == 0) {
+		i = 0;
+		lim = strlen(command);
+		while (i < lim) {
+			if (!isalnum((int)command[i]))
+				return 1;
+			i++;
+		}
+		return 0;
+	}
+	return 0;
+}
+#endif
+
+/* Completion match types. */
+enum match_type {
+	no_match,
+	extend_match,
+	ipv4_prefix_match,
+	ipv4_match,
+	ipv6_prefix_match,
+	ipv6_match,
+	range_match,
+	vararg_match,
+	partly_match,
+	exact_match
+};
+
+static enum match_type cmd_ipv4_match(const char *str)
+{
+	const char *sp;
+	int dots = 0, nums = 0;
+	char buf[4];
+
+	if (str == NULL)
+		return partly_match;
+
+	for (;;) {
+		memset(buf, 0, sizeof(buf));
+		sp = str;
+		while (*str != '\0') {
+			if (*str == '.') {
+				if (dots >= 3)
+					return no_match;
+
+				if (*(str + 1) == '.')
+					return no_match;
+
+				if (*(str + 1) == '\0')
+					return partly_match;
+
+				dots++;
+				break;
+			}
+			if (!isdigit((int)*str))
+				return no_match;
+
+			str++;
+		}
+
+		if (str - sp > 3)
+			return no_match;
+
+		strncpy(buf, sp, str - sp);
+		if (atoi(buf) > 255)
+			return no_match;
+
+		nums++;
+
+		if (*str == '\0')
+			break;
+
+		str++;
+	}
+
+	if (nums < 4)
+		return partly_match;
+
+	return exact_match;
+}
+
+static enum match_type cmd_ipv4_prefix_match(const char *str)
+{
+	const char *sp;
+	int dots = 0;
+	char buf[4];
+
+	if (str == NULL)
+		return partly_match;
+
+	for (;;) {
+		memset(buf, 0, sizeof(buf));
+		sp = str;
+		while (*str != '\0' && *str != '/') {
+			if (*str == '.') {
+				if (dots == 3)
+					return no_match;
+
+				if (*(str + 1) == '.' || *(str + 1) == '/')
+					return no_match;
+
+				if (*(str + 1) == '\0')
+					return partly_match;
+
+				dots++;
+				break;
+			}
+
+			if (!isdigit((int)*str))
+				return no_match;
+
+			str++;
+		}
+
+		if (str - sp > 3)
+			return no_match;
+
+		strncpy(buf, sp, str - sp);
+		if (atoi(buf) > 255)
+			return no_match;
+
+		if (dots == 3) {
+			if (*str == '/') {
+				if (*(str + 1) == '\0')
+					return partly_match;
+
+				str++;
+				break;
+			} else if (*str == '\0')
+				return partly_match;
+		}
+
+		if (*str == '\0')
+			return partly_match;
+
+		str++;
+	}
+
+	sp = str;
+	while (*str != '\0') {
+		if (!isdigit((int)*str))
+			return no_match;
+
+		str++;
+	}
+
+	if (atoi(sp) > 32)
+		return no_match;
+
+	return exact_match;
+}
+
+#define IPV6_ADDR_STR		"0123456789abcdefABCDEF:.%"
+#define IPV6_PREFIX_STR		"0123456789abcdefABCDEF:.%/"
+#define STATE_START		1
+#define STATE_COLON		2
+#define STATE_DOUBLE		3
+#define STATE_ADDR		4
+#define STATE_DOT               5
+#define STATE_SLASH		6
+#define STATE_MASK		7
+
+#ifdef HAVE_IPV6
+
+static enum match_type cmd_ipv6_match(const char *str)
+{
+	int state = STATE_START;
+	int colons = 0, nums = 0, double_colon = 0;
+	const char *sp = NULL;
+	struct sockaddr_in6 sin6_dummy;
+	int ret;
+
+	if (str == NULL)
+		return partly_match;
+
+	if (strspn(str, IPV6_ADDR_STR) != strlen(str))
+		return no_match;
+
+	/* use inet_pton that has a better support,
+	 * for example inet_pton can support the automatic addresses:
+	 *  ::1.2.3.4
+	 */
+	ret = inet_pton(AF_INET6, str, &sin6_dummy.sin6_addr);
+
+	if (ret == 1)
+		return exact_match;
+
+	while (*str != '\0') {
+		switch (state) {
+		case STATE_START:
+			if (*str == ':') {
+				if (*(str + 1) != ':' && *(str + 1) != '\0')
+					return no_match;
+				colons--;
+				state = STATE_COLON;
+			} else {
+				sp = str;
+				state = STATE_ADDR;
+			}
+
+			continue;
+		case STATE_COLON:
+			colons++;
+			if (*(str + 1) == ':')
+				state = STATE_DOUBLE;
+			else {
+				sp = str + 1;
+				state = STATE_ADDR;
+			}
+			break;
+		case STATE_DOUBLE:
+			if (double_colon)
+				return no_match;
+
+			if (*(str + 1) == ':')
+				return no_match;
+			else {
+				if (*(str + 1) != '\0')
+					colons++;
+				sp = str + 1;
+				state = STATE_ADDR;
+			}
+
+			double_colon++;
+			nums++;
+			break;
+		case STATE_ADDR:
+			if (*(str + 1) == ':' || *(str + 1) == '\0') {
+				if (str - sp > 3)
+					return no_match;
+
+				nums++;
+				state = STATE_COLON;
+			}
+			if (*(str + 1) == '.')
+				state = STATE_DOT;
+			break;
+		case STATE_DOT:
+			state = STATE_ADDR;
+			break;
+		default:
+			break;
+		}
+
+		if (nums > 8)
+			return no_match;
+
+		if (colons > 7)
+			return no_match;
+
+		str++;
+	}
+
+#if 0
+	if (nums < 11)
+		return partly_match;
+#endif				/* 0 */
+
+	return exact_match;
+}
+
+static enum match_type cmd_ipv6_prefix_match(const char *str)
+{
+	int state = STATE_START;
+	int colons = 0, nums = 0, double_colon = 0;
+	int mask;
+	const char *sp = NULL;
+	char *endptr = NULL;
+
+	if (str == NULL)
+		return partly_match;
+
+	if (strspn(str, IPV6_PREFIX_STR) != strlen(str))
+		return no_match;
+
+	while (*str != '\0' && state != STATE_MASK) {
+		switch (state) {
+		case STATE_START:
+			if (*str == ':') {
+				if (*(str + 1) != ':' && *(str + 1) != '\0')
+					return no_match;
+				colons--;
+				state = STATE_COLON;
+			} else {
+				sp = str;
+				state = STATE_ADDR;
+			}
+
+			continue;
+		case STATE_COLON:
+			colons++;
+			if (*(str + 1) == '/')
+				return no_match;
+			else if (*(str + 1) == ':')
+				state = STATE_DOUBLE;
+			else {
+				sp = str + 1;
+				state = STATE_ADDR;
+			}
+			break;
+		case STATE_DOUBLE:
+			if (double_colon)
+				return no_match;
+
+			if (*(str + 1) == ':')
+				return no_match;
+			else {
+				if (*(str + 1) != '\0' && *(str + 1) != '/')
+					colons++;
+				sp = str + 1;
+
+				if (*(str + 1) == '/')
+					state = STATE_SLASH;
+				else
+					state = STATE_ADDR;
+			}
+
+			double_colon++;
+			nums += 1;
+			break;
+		case STATE_ADDR:
+			if (*(str + 1) == ':' || *(str + 1) == '.'
+			    || *(str + 1) == '\0' || *(str + 1) == '/') {
+				if (str - sp > 3)
+					return no_match;
+
+				for (; sp <= str; sp++)
+					if (*sp == '/')
+						return no_match;
+
+				nums++;
+
+				if (*(str + 1) == ':')
+					state = STATE_COLON;
+				else if (*(str + 1) == '.')
+					state = STATE_DOT;
+				else if (*(str + 1) == '/')
+					state = STATE_SLASH;
+			}
+			break;
+		case STATE_DOT:
+			state = STATE_ADDR;
+			break;
+		case STATE_SLASH:
+			if (*(str + 1) == '\0')
+				return partly_match;
+
+			state = STATE_MASK;
+			break;
+		default:
+			break;
+		}
+
+		if (nums > 11)
+			return no_match;
+
+		if (colons > 7)
+			return no_match;
+
+		str++;
+	}
+
+	if (state < STATE_MASK)
+		return partly_match;
+
+	mask = strtol(str, &endptr, 10);
+	if (*endptr != '\0')
+		return no_match;
+
+	if (mask < 0 || mask > 128)
+		return no_match;
+
+/* I don't know why mask < 13 makes command match partly.
+   Forgive me to make this comments. I Want to set static default route
+   because of lack of function to originate default in ospf6d; sorry
+       yasu
+  if (mask < 13)
+    return partly_match;
+*/
+
+	return exact_match;
+}
+
+#endif				/* HAVE_IPV6  */
+
+#define DECIMAL_STRLEN_MAX 10
+
+static int cmd_range_match(const char *range, const char *str)
+{
+	char *p;
+	char buf[DECIMAL_STRLEN_MAX + 1];
+	char *endptr = NULL;
+	unsigned long min, max, val;
+
+	if (str == NULL)
+		return 1;
+
+	val = strtoul(str, &endptr, 10);
+	if (*endptr != '\0')
+		return 0;
+
+	range++;
+	p = strchr(range, '-');
+	if (p == NULL)
+		return 0;
+	if (p - range > DECIMAL_STRLEN_MAX)
+		return 0;
+	strncpy(buf, range, p - range);
+	buf[p - range] = '\0';
+	min = strtoul(buf, &endptr, 10);
+	if (*endptr != '\0')
+		return 0;
+
+	range = p + 1;
+	p = strchr(range, '>');
+	if (p == NULL)
+		return 0;
+	if (p - range > DECIMAL_STRLEN_MAX)
+		return 0;
+	strncpy(buf, range, p - range);
+	buf[p - range] = '\0';
+	max = strtoul(buf, &endptr, 10);
+	if (*endptr != '\0')
+		return 0;
+
+	if (val < min || val > max)
+		return 0;
+
+	return 1;
+}
+
+/* Make completion match and return match type flag. */
+static enum match_type
+cmd_filter_by_completion(char *command, vector v, unsigned int index)
+{
+	unsigned int i;
+	const char *str;
+	struct cmd_element *cmd_element;
+	enum match_type match_type;
+	vector descvec;
+	struct desc *desc;
+
+	match_type = no_match;
+
+	/* If command and cmd_element string does not match set NULL to vector */
+	for (i = 0; i < vector_active(v); i++)
+		if ((cmd_element = vector_slot(v, i)) != NULL) {
+			if (index >= vector_active(cmd_element->strvec))
+				vector_slot(v, i) = NULL;
+			else {
+				unsigned int j;
+				int matched = 0;
+
+				descvec =
+				    vector_slot(cmd_element->strvec, index);
+
+				for (j = 0; j < vector_active(descvec); j++)
+					if ((desc = vector_slot(descvec, j))) {
+						str = desc->cmd;
+
+						if (CMD_VARARG(str)) {
+							if (match_type <
+							    vararg_match)
+								match_type =
+								    vararg_match;
+							matched++;
+						} else if (CMD_RANGE(str)) {
+							if (cmd_range_match
+							    (str, command)) {
+								if (match_type <
+								    range_match)
+									match_type
+									    =
+									    range_match;
+
+								matched++;
+							}
+						}
+#ifdef HAVE_IPV6
+						else if (CMD_IPV6(str)) {
+							if (cmd_ipv6_match
+							    (command)) {
+								if (match_type <
+								    ipv6_match)
+									match_type
+									    =
+									    ipv6_match;
+
+								matched++;
+							}
+						} else if (CMD_IPV6_PREFIX(str)) {
+							if (cmd_ipv6_prefix_match(command)) {
+								if (match_type <
+								    ipv6_prefix_match)
+									match_type
+									    =
+									    ipv6_prefix_match;
+
+								matched++;
+							}
+						}
+#endif				/* HAVE_IPV6  */
+						else if (CMD_IPV4(str)) {
+							if (cmd_ipv4_match
+							    (command)) {
+								if (match_type <
+								    ipv4_match)
+									match_type
+									    =
+									    ipv4_match;
+
+								matched++;
+							}
+						} else if (CMD_IPV4_PREFIX(str)) {
+							if (cmd_ipv4_prefix_match(command)) {
+								if (match_type <
+								    ipv4_prefix_match)
+									match_type
+									    =
+									    ipv4_prefix_match;
+								matched++;
+							}
+						} else
+							/* Check is this point's argument optional ? */
+						if (CMD_OPTION(str)
+							    ||
+							    CMD_VARIABLE(str)) {
+							if (match_type <
+							    extend_match)
+								match_type =
+								    extend_match;
+							matched++;
+						} else
+						    if (strncmp
+							(command, str,
+							 strlen(command)) ==
+							0) {
+							if (strcmp(command, str)
+							    == 0)
+								match_type =
+								    exact_match;
+							else {
+								if (match_type <
+								    partly_match)
+									match_type
+									    =
+									    partly_match;
+							}
+							matched++;
+						}
+					}
+				if (!matched)
+					vector_slot(v, i) = NULL;
+			}
+		}
+	return match_type;
+}
+
+/* Filter vector by command character with index. */
+static enum match_type
+cmd_filter_by_string(char *command, vector v, unsigned int index)
+{
+	unsigned int i;
+	const char *str;
+	struct cmd_element *cmd_element;
+	enum match_type match_type;
+	vector descvec;
+	struct desc *desc;
+
+	match_type = no_match;
+
+	/* If command and cmd_element string does not match set NULL to vector */
+	for (i = 0; i < vector_active(v); i++)
+		if ((cmd_element = vector_slot(v, i)) != NULL) {
+			/* If given index is bigger than max string vector of command,
+			   set NULL */
+			if (index >= vector_active(cmd_element->strvec))
+				vector_slot(v, i) = NULL;
+			else {
+				unsigned int j;
+				int matched = 0;
+
+				descvec =
+				    vector_slot(cmd_element->strvec, index);
+
+				for (j = 0; j < vector_active(descvec); j++)
+					if ((desc = vector_slot(descvec, j))) {
+						str = desc->cmd;
+
+						if (CMD_VARARG(str)) {
+							if (match_type <
+							    vararg_match)
+								match_type =
+								    vararg_match;
+							matched++;
+						} else if (CMD_RANGE(str)) {
+							if (cmd_range_match
+							    (str, command)) {
+								if (match_type <
+								    range_match)
+									match_type
+									    =
+									    range_match;
+								matched++;
+							}
+						}
+#ifdef HAVE_IPV6
+						else if (CMD_IPV6(str)) {
+							if (cmd_ipv6_match
+							    (command) ==
+							    exact_match) {
+								if (match_type <
+								    ipv6_match)
+									match_type
+									    =
+									    ipv6_match;
+								matched++;
+							}
+						} else if (CMD_IPV6_PREFIX(str)) {
+							if (cmd_ipv6_prefix_match(command) == exact_match) {
+								if (match_type <
+								    ipv6_prefix_match)
+									match_type
+									    =
+									    ipv6_prefix_match;
+								matched++;
+							}
+						}
+#endif				/* HAVE_IPV6  */
+						else if (CMD_IPV4(str)) {
+							if (cmd_ipv4_match
+							    (command) ==
+							    exact_match) {
+								if (match_type <
+								    ipv4_match)
+									match_type
+									    =
+									    ipv4_match;
+								matched++;
+							}
+						} else if (CMD_IPV4_PREFIX(str)) {
+							if (cmd_ipv4_prefix_match(command) == exact_match) {
+								if (match_type <
+								    ipv4_prefix_match)
+									match_type
+									    =
+									    ipv4_prefix_match;
+								matched++;
+							}
+						} else if (CMD_OPTION(str)
+							   || CMD_VARIABLE(str))
+						{
+							if (match_type <
+							    extend_match)
+								match_type =
+								    extend_match;
+							matched++;
+						} else {
+							if (strcmp(command, str)
+							    == 0) {
+								match_type =
+								    exact_match;
+								matched++;
+							}
+						}
+					}
+				if (!matched)
+					vector_slot(v, i) = NULL;
+			}
+		}
+	return match_type;
+}
+
+/* Check ambiguous match */
+static int
+is_cmd_ambiguous(char *command, vector v, int index, enum match_type type)
+{
+	unsigned int i;
+	unsigned int j;
+	const char *str = NULL;
+	struct cmd_element *cmd_element;
+	const char *matched = NULL;
+	vector descvec;
+	struct desc *desc;
+
+	for (i = 0; i < vector_active(v); i++)
+		if ((cmd_element = vector_slot(v, i)) != NULL) {
+			int match = 0;
+
+			descvec = vector_slot(cmd_element->strvec, index);
+
+			for (j = 0; j < vector_active(descvec); j++)
+				if ((desc = vector_slot(descvec, j))) {
+					enum match_type ret;
+
+					str = desc->cmd;
+
+					switch (type) {
+					case exact_match:
+						if (!
+						    (CMD_OPTION(str)
+						     || CMD_VARIABLE(str))
+&& strcmp(command, str) == 0)
+							match++;
+						break;
+					case partly_match:
+						if (!
+						    (CMD_OPTION(str)
+						     || CMD_VARIABLE(str))
+&& strncmp(command, str, strlen(command)) == 0) {
+							if (matched
+							    && strcmp(matched,
+								      str) != 0)
+								return 1;	/* There is ambiguous match. */
+							else
+								matched = str;
+							match++;
+						}
+						break;
+					case range_match:
+						if (cmd_range_match
+						    (str, command)) {
+							if (matched
+							    && strcmp(matched,
+								      str) != 0)
+								return 1;
+							else
+								matched = str;
+							match++;
+						}
+						break;
+#ifdef HAVE_IPV6
+					case ipv6_match:
+						if (CMD_IPV6(str))
+							match++;
+						break;
+					case ipv6_prefix_match:
+						if ((ret =
+						     cmd_ipv6_prefix_match
+						     (command)) != no_match) {
+							if (ret == partly_match)
+								return 2;	/* There is incomplete match. */
+
+							match++;
+						}
+						break;
+#endif				/* HAVE_IPV6 */
+					case ipv4_match:
+						if (CMD_IPV4(str))
+							match++;
+						break;
+					case ipv4_prefix_match:
+						if ((ret =
+						     cmd_ipv4_prefix_match
+						     (command)) != no_match) {
+							if (ret == partly_match)
+								return 2;	/* There is incomplete match. */
+
+							match++;
+						}
+						break;
+					case extend_match:
+						if (CMD_OPTION(str)
+						    || CMD_VARIABLE(str))
+							match++;
+						break;
+					case no_match:
+					default:
+						break;
+					}
+				}
+			if (!match)
+				vector_slot(v, i) = NULL;
+		}
+	return 0;
+}
+
+/* If src matches dst return dst string, otherwise return NULL */
+static const char *cmd_entry_function(const char *src, const char *dst)
+{
+	/* Skip variable arguments. */
+	if (CMD_OPTION(dst) || CMD_VARIABLE(dst) || CMD_VARARG(dst) ||
+	    CMD_IPV4(dst) || CMD_IPV4_PREFIX(dst) || CMD_RANGE(dst))
+		return NULL;
+
+	/* In case of 'command \t', given src is NULL string. */
+	if (src == NULL)
+		return dst;
+
+	/* Matched with input string. */
+	if (strncmp(src, dst, strlen(src)) == 0)
+		return dst;
+
+	return NULL;
+}
+
+/* If src matches dst return dst string, otherwise return NULL */
+/* This version will return the dst string always if it is
+   CMD_VARIABLE for '?' key processing */
+static const char *cmd_entry_function_desc(const char *src, const char *dst)
+{
+	if (CMD_VARARG(dst))
+		return dst;
+
+	if (CMD_RANGE(dst)) {
+		if (cmd_range_match(dst, src))
+			return dst;
+		else
+			return NULL;
+	}
+#ifdef HAVE_IPV6
+	if (CMD_IPV6(dst)) {
+		if (cmd_ipv6_match(src))
+			return dst;
+		else
+			return NULL;
+	}
+
+	if (CMD_IPV6_PREFIX(dst)) {
+		if (cmd_ipv6_prefix_match(src))
+			return dst;
+		else
+			return NULL;
+	}
+#endif				/* HAVE_IPV6 */
+
+	if (CMD_IPV4(dst)) {
+		if (cmd_ipv4_match(src))
+			return dst;
+		else
+			return NULL;
+	}
+
+	if (CMD_IPV4_PREFIX(dst)) {
+		if (cmd_ipv4_prefix_match(src))
+			return dst;
+		else
+			return NULL;
+	}
+
+	/* Optional or variable commands always match on '?' */
+	if (CMD_OPTION(dst) || CMD_VARIABLE(dst))
+		return dst;
+
+	/* In case of 'command \t', given src is NULL string. */
+	if (src == NULL)
+		return dst;
+
+	if (strncmp(src, dst, strlen(src)) == 0)
+		return dst;
+	else
+		return NULL;
+}
+
+/* Check same string element existence.  If it isn't there return
+    1. */
+static int cmd_unique_string(vector v, const char *str)
+{
+	unsigned int i;
+	char *match;
+
+	for (i = 0; i < vector_active(v); i++)
+		if ((match = vector_slot(v, i)) != NULL)
+			if (strcmp(match, str) == 0)
+				return 0;
+	return 1;
+}
+
+/* Compare string to description vector.  If there is same string
+   return 1 else return 0. */
+static int desc_unique_string(vector v, const char *str)
+{
+	unsigned int i;
+	struct desc *desc;
+
+	for (i = 0; i < vector_active(v); i++)
+		if ((desc = vector_slot(v, i)) != NULL)
+			if (strcmp(desc->cmd, str) == 0)
+				return 1;
+	return 0;
+}
+
+static int cmd_try_do_shortcut(enum node_type node, char *first_word)
+{
+	if (first_word != NULL &&
+	    node != AUTH_NODE &&
+	    node != VIEW_NODE &&
+	    node != AUTH_ENABLE_NODE &&
+	    node != ENABLE_NODE && 0 == strcmp("do", first_word))
+		return 1;
+	return 0;
+}
+
+/* '?' describe command support. */
+static vector
+cmd_describe_command_real(vector vline, struct vty *vty, int *status)
+{
+	unsigned int i;
+	vector cmd_vector;
+#define INIT_MATCHVEC_SIZE 10
+	vector matchvec;
+	struct cmd_element *cmd_element;
+	unsigned int index;
+	int ret;
+	enum match_type match;
+	char *command;
+	static struct desc desc_cr = { "<cr>", "" };
+
+	/* Set index. */
+	if (vector_active(vline) == 0) {
+		*status = CMD_ERR_NO_MATCH;
+		return NULL;
+	} else
+		index = vector_active(vline) - 1;
+
+	/* Make copy vector of current node's command vector. */
+	cmd_vector = vector_copy(cmd_node_vector(cmdvec, vty->node));
+
+	/* Prepare match vector */
+	matchvec = vector_init(INIT_MATCHVEC_SIZE);
+
+	/* Filter commands. */
+	/* Only words precedes current word will be checked in this loop. */
+	for (i = 0; i < index; i++)
+		if ((command = vector_slot(vline, i))) {
+			match =
+			    cmd_filter_by_completion(command, cmd_vector, i);
+
+			if (match == vararg_match) {
+				struct cmd_element *cmd_element;
+				vector descvec;
+				unsigned int j, k;
+
+				for (j = 0; j < vector_active(cmd_vector); j++)
+					if ((cmd_element =
+					     vector_slot(cmd_vector, j)) != NULL
+					    &&
+					    (vector_active
+					     (cmd_element->strvec))) {
+						descvec =
+						    vector_slot(cmd_element->
+								strvec,
+								vector_active
+								(cmd_element->
+								 strvec) - 1);
+						for (k = 0;
+						     k < vector_active(descvec);
+						     k++) {
+							struct desc *desc =
+							    vector_slot(descvec,
+									k);
+							vector_set(matchvec,
+								   desc);
+						}
+					}
+
+				vector_set(matchvec, &desc_cr);
+				vector_free(cmd_vector);
+
+				return matchvec;
+			}
+
+			if ((ret =
+			     is_cmd_ambiguous(command, cmd_vector, i,
+					      match)) == 1) {
+				vector_free(cmd_vector);
+				*status = CMD_ERR_AMBIGUOUS;
+				return NULL;
+			} else if (ret == 2) {
+				vector_free(cmd_vector);
+				*status = CMD_ERR_NO_MATCH;
+				return NULL;
+			}
+		}
+
+	/* Prepare match vector */
+	/*  matchvec = vector_init (INIT_MATCHVEC_SIZE); */
+
+	/* Make sure that cmd_vector is filtered based on current word */
+	command = vector_slot(vline, index);
+	if (command)
+		match = cmd_filter_by_completion(command, cmd_vector, index);
+
+	/* Make description vector. */
+	for (i = 0; i < vector_active(cmd_vector); i++)
+		if ((cmd_element = vector_slot(cmd_vector, i)) != NULL) {
+			const char *string = NULL;
+			vector strvec = cmd_element->strvec;
+
+			/* if command is NULL, index may be equal to vector_active */
+			if (command && index >= vector_active(strvec))
+				vector_slot(cmd_vector, i) = NULL;
+			else {
+				/* Check if command is completed. */
+				if (command == NULL
+				    && index == vector_active(strvec)) {
+					string = "<cr>";
+					if (!desc_unique_string
+					    (matchvec, string))
+						vector_set(matchvec, &desc_cr);
+				} else {
+					unsigned int j;
+					vector descvec =
+					    vector_slot(strvec, index);
+					struct desc *desc;
+
+					for (j = 0; j < vector_active(descvec);
+					     j++)
+						if ((desc =
+						     vector_slot(descvec, j))) {
+							string =
+							    cmd_entry_function_desc
+							    (command,
+							     desc->cmd);
+							if (string) {
+								/* Uniqueness check */
+								if (!desc_unique_string(matchvec, string))
+									vector_set
+									    (matchvec,
+									     desc);
+							}
+						}
+				}
+			}
+		}
+	vector_free(cmd_vector);
+
+	if (vector_slot(matchvec, 0) == NULL) {
+		vector_free(matchvec);
+		*status = CMD_ERR_NO_MATCH;
+	} else
+		*status = CMD_SUCCESS;
+
+	return matchvec;
+}
+
+vector cmd_describe_command(vector vline, struct vty * vty, int *status)
+{
+	vector ret;
+
+	if (cmd_try_do_shortcut(vty->node, vector_slot(vline, 0))) {
+		enum node_type onode;
+		vector shifted_vline;
+		unsigned int index;
+
+		onode = vty->node;
+		vty->node = ENABLE_NODE;
+		/* We can try it on enable node, cos' the vty is authenticated */
+
+		shifted_vline = vector_init(vector_count(vline));
+		/* use memcpy? */
+		for (index = 1; index < vector_active(vline); index++) {
+			vector_set_index(shifted_vline, index - 1,
+					 vector_lookup(vline, index));
+		}
+
+		ret = cmd_describe_command_real(shifted_vline, vty, status);
+
+		vector_free(shifted_vline);
+		vty->node = onode;
+		return ret;
+	}
+
+	return cmd_describe_command_real(vline, vty, status);
+}
+
+/* Check LCD of matched command. */
+static int cmd_lcd(char **matched)
+{
+	int i;
+	int j;
+	int lcd = -1;
+	char *s1, *s2;
+	char c1, c2;
+
+	if (matched[0] == NULL || matched[1] == NULL)
+		return 0;
+
+	for (i = 1; matched[i] != NULL; i++) {
+		s1 = matched[i - 1];
+		s2 = matched[i];
+
+		for (j = 0; (c1 = s1[j]) && (c2 = s2[j]); j++)
+			if (c1 != c2)
+				break;
+
+		if (lcd < 0)
+			lcd = j;
+		else {
+			if (lcd > j)
+				lcd = j;
+		}
+	}
+	return lcd;
+}
+
+/* Command line completion support. */
+static char **cmd_complete_command_real(vector vline, struct vty *vty,
+					int *status)
+{
+	unsigned int i;
+	vector cmd_vector = vector_copy(cmd_node_vector(cmdvec, vty->node));
+#define INIT_MATCHVEC_SIZE 10
+	vector matchvec;
+	struct cmd_element *cmd_element;
+	unsigned int index;
+	char **match_str;
+	struct desc *desc;
+	vector descvec;
+	char *command;
+	int lcd;
+
+	if (vector_active(vline) == 0) {
+		*status = CMD_ERR_NO_MATCH;
+		return NULL;
+	} else
+		index = vector_active(vline) - 1;
+
+	/* First, filter by preceeding command string */
+	for (i = 0; i < index; i++)
+		if ((command = vector_slot(vline, i))) {
+			enum match_type match;
+			int ret;
+
+			/* First try completion match, if there is exactly match return 1 */
+			match =
+			    cmd_filter_by_completion(command, cmd_vector, i);
+
+			/* If there is exact match then filter ambiguous match else check
+			   ambiguousness. */
+			if ((ret =
+			     is_cmd_ambiguous(command, cmd_vector, i,
+					      match)) == 1) {
+				vector_free(cmd_vector);
+				*status = CMD_ERR_AMBIGUOUS;
+				return NULL;
+			}
+			/*
+			   else if (ret == 2)
+			   {
+			   vector_free (cmd_vector);
+			   *status = CMD_ERR_NO_MATCH;
+			   return NULL;
+			   }
+			 */
+		}
+
+	/* Prepare match vector. */
+	matchvec = vector_init(INIT_MATCHVEC_SIZE);
+
+	/* Now we got into completion */
+	for (i = 0; i < vector_active(cmd_vector); i++)
+		if ((cmd_element = vector_slot(cmd_vector, i))) {
+			const char *string;
+			vector strvec = cmd_element->strvec;
+
+			/* Check field length */
+			if (index >= vector_active(strvec))
+				vector_slot(cmd_vector, i) = NULL;
+			else {
+				unsigned int j;
+
+				descvec = vector_slot(strvec, index);
+				for (j = 0; j < vector_active(descvec); j++)
+					if ((desc = vector_slot(descvec, j))) {
+						if ((string =
+						     cmd_entry_function
+						     (vector_slot(vline, index),
+						      desc->cmd)))
+							if (cmd_unique_string
+							    (matchvec, string))
+								vector_set
+								    (matchvec,
+								     strdup
+								     (string));
+					}
+			}
+		}
+
+	/* We don't need cmd_vector any more. */
+	vector_free(cmd_vector);
+
+	/* No matched command */
+	if (vector_slot(matchvec, 0) == NULL) {
+		vector_free(matchvec);
+
+		/* In case of 'command \t' pattern.  Do you need '?' command at
+		   the end of the line. */
+		if (vector_slot(vline, index) == '\0')
+			*status = CMD_ERR_NOTHING_TODO;
+		else
+			*status = CMD_ERR_NO_MATCH;
+		return NULL;
+	}
+
+	/* Only one matched */
+	if (vector_slot(matchvec, 1) == NULL) {
+		match_str = (char **)matchvec->index;
+		vector_only_wrapper_free(matchvec);
+		*status = CMD_COMPLETE_FULL_MATCH;
+		return match_str;
+	}
+	/* Make it sure last element is NULL. */
+	vector_set(matchvec, NULL);
+
+	/* Check LCD of matched strings. */
+	if (vector_slot(vline, index) != NULL) {
+		lcd = cmd_lcd((char **)matchvec->index);
+
+		if (lcd) {
+			int len = strlen(vector_slot(vline, index));
+
+			if (len < lcd) {
+				char *lcdstr;
+
+				lcdstr = malloc(lcd + 1);
+				memcpy(lcdstr, matchvec->index[0], lcd);
+				lcdstr[lcd] = '\0';
+
+				/* match_str = (char **) &lcdstr; */
+
+				/* Free matchvec. */
+				for (i = 0; i < vector_active(matchvec); i++) {
+					if (vector_slot(matchvec, i))
+						free(vector_slot(matchvec, i));
+				}
+				vector_free(matchvec);
+
+				/* Make new matchvec. */
+				matchvec = vector_init(INIT_MATCHVEC_SIZE);
+				vector_set(matchvec, lcdstr);
+				match_str = (char **)matchvec->index;
+				vector_only_wrapper_free(matchvec);
+
+				*status = CMD_COMPLETE_MATCH;
+				return match_str;
+			}
+		}
+	}
+
+	match_str = (char **)matchvec->index;
+	vector_only_wrapper_free(matchvec);
+	*status = CMD_COMPLETE_LIST_MATCH;
+	return match_str;
+}
+
+char **cmd_complete_command(vector vline, struct vty *vty, int *status)
+{
+	char **ret;
+
+	if (cmd_try_do_shortcut(vty->node, vector_slot(vline, 0))) {
+		enum node_type onode;
+		vector shifted_vline;
+		unsigned int index;
+
+		onode = vty->node;
+		vty->node = ENABLE_NODE;
+		/* We can try it on enable node, cos' the vty is authenticated */
+
+		shifted_vline = vector_init(vector_count(vline));
+		/* use memcpy? */
+		for (index = 1; index < vector_active(vline); index++) {
+			vector_set_index(shifted_vline, index - 1,
+					 vector_lookup(vline, index));
+		}
+
+		ret = cmd_complete_command_real(shifted_vline, vty, status);
+
+		vector_free(shifted_vline);
+		vty->node = onode;
+		return ret;
+	}
+
+	return cmd_complete_command_real(vline, vty, status);
+}
+
+/* return parent node */
+/* MUST eventually converge on CONFIG_NODE */
+enum node_type node_parent(enum node_type node)
+{
+	enum node_type ret;
+
+	assert(node > CONFIG_NODE);
+
+	switch (node) {
+	case BGP_VPNV4_NODE:
+	case BGP_IPV4_NODE:
+	case BGP_IPV4M_NODE:
+	case BGP_IPV6_NODE:
+		ret = BGP_NODE;
+		break;
+	case KEYCHAIN_KEY_NODE:
+		ret = KEYCHAIN_NODE;
+		break;
+	default:
+		ret = CONFIG_NODE;
+	}
+
+	return ret;
+}
+
+/* Execute command by argument vline vector. */
+static int
+cmd_execute_command_real(vector vline, struct vty *vty,
+			 struct cmd_element **cmd)
+{
+	unsigned int i;
+	unsigned int index;
+	vector cmd_vector;
+	struct cmd_element *cmd_element;
+	struct cmd_element *matched_element;
+	unsigned int matched_count, incomplete_count;
+	int argc;
+	const char *argv[CMD_ARGC_MAX];
+	enum match_type match = 0;
+	int varflag;
+	char *command;
+
+	/* Make copy of command elements. */
+	cmd_vector = vector_copy(cmd_node_vector(cmdvec, vty->node));
+
+	for (index = 0; index < vector_active(vline); index++)
+		if ((command = vector_slot(vline, index))) {
+			int ret;
+
+			match =
+			    cmd_filter_by_completion(command, cmd_vector,
+						     index);
+
+			if (match == vararg_match)
+				break;
+
+			ret =
+			    is_cmd_ambiguous(command, cmd_vector, index, match);
+
+			if (ret == 1) {
+				vector_free(cmd_vector);
+				return CMD_ERR_AMBIGUOUS;
+			} else if (ret == 2) {
+				vector_free(cmd_vector);
+				return CMD_ERR_NO_MATCH;
+			}
+		}
+
+	/* Check matched count. */
+	matched_element = NULL;
+	matched_count = 0;
+	incomplete_count = 0;
+
+	for (i = 0; i < vector_active(cmd_vector); i++)
+		if ((cmd_element = vector_slot(cmd_vector, i))) {
+			if (match == vararg_match
+			    || index >= cmd_element->cmdsize) {
+				matched_element = cmd_element;
+#if 0
+				printf("DEBUG: %s\n", cmd_element->string);
+#endif
+				matched_count++;
+			} else {
+				incomplete_count++;
+			}
+		}
+
+	/* Finish of using cmd_vector. */
+	vector_free(cmd_vector);
+
+	/* To execute command, matched_count must be 1. */
+	if (matched_count == 0) {
+		if (incomplete_count)
+			return CMD_ERR_INCOMPLETE;
+		else
+			return CMD_ERR_NO_MATCH;
+	}
+
+	if (matched_count > 1)
+		return CMD_ERR_AMBIGUOUS;
+
+	/* Argument treatment */
+	varflag = 0;
+	argc = 0;
+
+	for (i = 0; i < vector_active(vline); i++) {
+		if (varflag)
+			argv[argc++] = vector_slot(vline, i);
+		else {
+			vector descvec =
+			    vector_slot(matched_element->strvec, i);
+
+			if (vector_active(descvec) == 1) {
+				struct desc *desc = vector_slot(descvec, 0);
+
+				if (CMD_VARARG(desc->cmd))
+					varflag = 1;
+
+				if (varflag || CMD_VARIABLE(desc->cmd)
+				    || CMD_OPTION(desc->cmd))
+					argv[argc++] = vector_slot(vline, i);
+			} else
+				argv[argc++] = vector_slot(vline, i);
+		}
+
+		if (argc >= CMD_ARGC_MAX)
+			return CMD_ERR_EXEED_ARGC_MAX;
+	}
+
+	/* For vtysh execution. */
+	if (cmd)
+		*cmd = matched_element;
+
+	if (matched_element->daemon)
+		return CMD_SUCCESS_DAEMON;
+
+	/* Execute matched command. */
+	return (*matched_element->func) (matched_element, vty, argc, argv);
+}
+
+int
+cmd_execute_command(vector vline, struct vty *vty, struct cmd_element **cmd,
+		    int vtysh)
+{
+	int ret, saved_ret, tried = 0;
+	enum node_type onode, try_node;
+
+	onode = try_node = vty->node;
+
+	if (cmd_try_do_shortcut(vty->node, vector_slot(vline, 0))) {
+		vector shifted_vline;
+		unsigned int index;
+
+		vty->node = ENABLE_NODE;
+		/* We can try it on enable node, cos' the vty is authenticated */
+
+		shifted_vline = vector_init(vector_count(vline));
+		/* use memcpy? */
+		for (index = 1; index < vector_active(vline); index++) {
+			vector_set_index(shifted_vline, index - 1,
+					 vector_lookup(vline, index));
+		}
+
+		ret = cmd_execute_command_real(shifted_vline, vty, cmd);
+
+		vector_free(shifted_vline);
+		vty->node = onode;
+		return ret;
+	}
+
+	saved_ret = ret = cmd_execute_command_real(vline, vty, cmd);
+
+	if (vtysh)
+		return saved_ret;
+
+	/* This assumes all nodes above CONFIG_NODE are childs of CONFIG_NODE */
+	while (ret != CMD_SUCCESS && ret != CMD_WARNING
+	       && vty->node > CONFIG_NODE) {
+		try_node = node_parent(try_node);
+		vty->node = try_node;
+		ret = cmd_execute_command_real(vline, vty, cmd);
+		tried = 1;
+		if (ret == CMD_SUCCESS || ret == CMD_WARNING) {
+			/* succesfull command, leave the node as is */
+			return ret;
+		}
+	}
+	/* no command succeeded, reset the vty to the original node and
+	   return the error for this node */
+	if (tried)
+		vty->node = onode;
+	return saved_ret;
+}
+
+/* Execute command by argument readline. */
+int
+cmd_execute_command_strict(vector vline, struct vty *vty,
+			   struct cmd_element **cmd)
+{
+	unsigned int i;
+	unsigned int index;
+	vector cmd_vector;
+	struct cmd_element *cmd_element;
+	struct cmd_element *matched_element;
+	unsigned int matched_count, incomplete_count;
+	int argc;
+	const char *argv[CMD_ARGC_MAX];
+	int varflag;
+	enum match_type match = 0;
+	char *command;
+
+	/* Make copy of command element */
+	cmd_vector = vector_copy(cmd_node_vector(cmdvec, vty->node));
+
+	for (index = 0; index < vector_active(vline); index++)
+		if ((command = vector_slot(vline, index))) {
+			int ret;
+
+			match = cmd_filter_by_string(vector_slot(vline, index),
+						     cmd_vector, index);
+
+			/* If command meets '.VARARG' then finish matching. */
+			if (match == vararg_match)
+				break;
+
+			ret =
+			    is_cmd_ambiguous(command, cmd_vector, index, match);
+			if (ret == 1) {
+				vector_free(cmd_vector);
+				return CMD_ERR_AMBIGUOUS;
+			}
+			if (ret == 2) {
+				vector_free(cmd_vector);
+				return CMD_ERR_NO_MATCH;
+			}
+		}
+
+	/* Check matched count. */
+	matched_element = NULL;
+	matched_count = 0;
+	incomplete_count = 0;
+	for (i = 0; i < vector_active(cmd_vector); i++)
+		if (vector_slot(cmd_vector, i) != NULL) {
+			cmd_element = vector_slot(cmd_vector, i);
+
+			if (match == vararg_match
+			    || index >= cmd_element->cmdsize) {
+				matched_element = cmd_element;
+				matched_count++;
+			} else
+				incomplete_count++;
+		}
+
+	/* Finish of using cmd_vector. */
+	vector_free(cmd_vector);
+
+	/* To execute command, matched_count must be 1. */
+	if (matched_count == 0) {
+		if (incomplete_count)
+			return CMD_ERR_INCOMPLETE;
+		else
+			return CMD_ERR_NO_MATCH;
+	}
+
+	if (matched_count > 1)
+		return CMD_ERR_AMBIGUOUS;
+
+	/* Argument treatment */
+	varflag = 0;
+	argc = 0;
+
+	for (i = 0; i < vector_active(vline); i++) {
+		if (varflag)
+			argv[argc++] = vector_slot(vline, i);
+		else {
+			vector descvec =
+			    vector_slot(matched_element->strvec, i);
+
+			if (vector_active(descvec) == 1) {
+				struct desc *desc = vector_slot(descvec, 0);
+
+				if (CMD_VARARG(desc->cmd))
+					varflag = 1;
+
+				if (varflag || CMD_VARIABLE(desc->cmd)
+				    || CMD_OPTION(desc->cmd))
+					argv[argc++] = vector_slot(vline, i);
+			} else
+				argv[argc++] = vector_slot(vline, i);
+		}
+
+		if (argc >= CMD_ARGC_MAX)
+			return CMD_ERR_EXEED_ARGC_MAX;
+	}
+
+	/* For vtysh execution. */
+	if (cmd)
+		*cmd = matched_element;
+
+	if (matched_element->daemon)
+		return CMD_SUCCESS_DAEMON;
+
+	/* Now execute matched command */
+	return (*matched_element->func) (matched_element, vty, argc, argv);
+}
+
+#if 0
+/* Configration make from file. */
+int config_from_file(struct vty *vty, FILE * fp)
+{
+	int ret;
+	vector vline;
+
+	while (fgets(vty->buf, VTY_BUFSIZ, fp)) {
+		vline = cmd_make_strvec(vty->buf);
+
+		/* In case of comment line */
+		if (vline == NULL)
+			continue;
+		/* Execute configuration command : this is strict match */
+		ret = cmd_execute_command_strict(vline, vty, NULL);
+
+		/* Try again with setting node to CONFIG_NODE */
+		while (ret != CMD_SUCCESS && ret != CMD_WARNING
+		       && ret != CMD_ERR_NOTHING_TODO
+		       && vty->node != CONFIG_NODE) {
+			vty->node = node_parent(vty->node);
+			ret = cmd_execute_command_strict(vline, vty, NULL);
+		}
+
+		cmd_free_strvec(vline);
+
+		if (ret != CMD_SUCCESS && ret != CMD_WARNING
+		    && ret != CMD_ERR_NOTHING_TODO)
+			return ret;
+	}
+	return CMD_SUCCESS;
+}
+#endif
+
+/* Configration from terminal */
+DEFUN(config_terminal,
+      config_terminal_cmd,
+      "configure terminal",
+      "Configuration from vty interface\n" "Configuration terminal\n")
+{
+	if (vty_config_lock(vty))
+		vty->node = CONFIG_NODE;
+	else {
+		vty_out(vty, "VTY configuration is locked by other VTY%s",
+			VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+	return CMD_SUCCESS;
+}
+
+/* Enable command */
+DEFUN(enable, config_enable_cmd, "enable", "Turn on privileged mode command\n")
+{
+	/* If enable password is NULL, change to ENABLE_NODE */
+	if ((host.enable == NULL && host.enable_encrypt == NULL) ||
+	    vty->type == VTY_SHELL_SERV)
+		vty->node = ENABLE_NODE;
+	else
+		vty->node = AUTH_ENABLE_NODE;
+
+	return CMD_SUCCESS;
+}
+
+/* Disable command */
+DEFUN(disable,
+      config_disable_cmd, "disable", "Turn off privileged mode command\n")
+{
+	if (vty->node == ENABLE_NODE)
+		vty->node = VIEW_NODE;
+	return CMD_SUCCESS;
+}
+
+/* Down vty node level. */
+DEFUN(config_exit,
+      config_exit_cmd, "exit", "Exit current mode and down to previous mode\n")
+{
+	switch (vty->node) {
+	case BTS_NODE:
+		vty->node = VIEW_NODE;
+		break;
+	case TRX_NODE:
+		vty->node = BTS_NODE;
+		break;
+	case TS_NODE:
+		vty->node = TRX_NODE;
+		break;
+	case VIEW_NODE:
+	case ENABLE_NODE:
+		if (0)		//vty_shell (vty))
+			exit(0);
+		else
+			vty->status = VTY_CLOSE;
+		break;
+	case CONFIG_NODE:
+		vty->node = ENABLE_NODE;
+		vty_config_unlock(vty);
+		break;
+	case INTERFACE_NODE:
+	case ZEBRA_NODE:
+	case BGP_NODE:
+	case RIP_NODE:
+	case RIPNG_NODE:
+	case OSPF_NODE:
+	case OSPF6_NODE:
+	case ISIS_NODE:
+	case KEYCHAIN_NODE:
+	case MASC_NODE:
+	case RMAP_NODE:
+	case VTY_NODE:
+		vty->node = CONFIG_NODE;
+		break;
+	case BGP_VPNV4_NODE:
+	case BGP_IPV4_NODE:
+	case BGP_IPV4M_NODE:
+	case BGP_IPV6_NODE:
+		vty->node = BGP_NODE;
+		break;
+	case KEYCHAIN_KEY_NODE:
+		vty->node = KEYCHAIN_NODE;
+		break;
+	default:
+		break;
+	}
+	return CMD_SUCCESS;
+}
+
+/* quit is alias of exit. */
+ALIAS(config_exit,
+      config_quit_cmd, "quit", "Exit current mode and down to previous mode\n")
+
+/* End of configuration. */
+    DEFUN(config_end,
+      config_end_cmd, "end", "End current mode and change to enable mode.")
+{
+	switch (vty->node) {
+	case VIEW_NODE:
+	case ENABLE_NODE:
+		/* Nothing to do. */
+		break;
+	case CONFIG_NODE:
+	case INTERFACE_NODE:
+	case ZEBRA_NODE:
+	case RIP_NODE:
+	case RIPNG_NODE:
+	case BGP_NODE:
+	case BGP_VPNV4_NODE:
+	case BGP_IPV4_NODE:
+	case BGP_IPV4M_NODE:
+	case BGP_IPV6_NODE:
+	case RMAP_NODE:
+	case OSPF_NODE:
+	case OSPF6_NODE:
+	case ISIS_NODE:
+	case KEYCHAIN_NODE:
+	case KEYCHAIN_KEY_NODE:
+	case MASC_NODE:
+	case VTY_NODE:
+		vty_config_unlock(vty);
+		vty->node = ENABLE_NODE;
+		break;
+	default:
+		break;
+	}
+	return CMD_SUCCESS;
+}
+
+/* Show version. */
+DEFUN(show_version,
+      show_version_cmd, "show version", SHOW_STR "Displays program version\n")
+{
+	vty_out(vty, "%s %s (%s).%s", QUAGGA_PROGNAME, QUAGGA_VERSION,
+		host.name ? host.name : "", VTY_NEWLINE);
+	vty_out(vty, "%s%s", QUAGGA_COPYRIGHT, VTY_NEWLINE);
+
+	return CMD_SUCCESS;
+}
+
+/* Help display function for all node. */
+DEFUN(config_help,
+      config_help_cmd, "help", "Description of the interactive help system\n")
+{
+	vty_out(vty,
+		"This VTY provides advanced help features.  When you need help,%s\
+anytime at the command line please press '?'.%s\
+%s\
+If nothing matches, the help list will be empty and you must backup%s\
+ until entering a '?' shows the available options.%s\
+Two styles of help are provided:%s\
+1. Full help is available when you are ready to enter a%s\
+command argument (e.g. 'show ?') and describes each possible%s\
+argument.%s\
+2. Partial help is provided when an abbreviated argument is entered%s\
+   and you want to know what arguments match the input%s\
+   (e.g. 'show me?'.)%s%s", VTY_NEWLINE, VTY_NEWLINE, VTY_NEWLINE,
+		VTY_NEWLINE, VTY_NEWLINE, VTY_NEWLINE, VTY_NEWLINE, VTY_NEWLINE, VTY_NEWLINE, VTY_NEWLINE, VTY_NEWLINE, VTY_NEWLINE, VTY_NEWLINE);
+	return CMD_SUCCESS;
+}
+
+/* Help display function for all node. */
+DEFUN(config_list, config_list_cmd, "list", "Print command list\n")
+{
+	unsigned int i;
+	struct cmd_node *cnode = vector_slot(cmdvec, vty->node);
+	struct cmd_element *cmd;
+
+	for (i = 0; i < vector_active(cnode->cmd_vector); i++)
+		if ((cmd = vector_slot(cnode->cmd_vector, i)) != NULL
+		    && !(cmd->attr == CMD_ATTR_DEPRECATED
+			 || cmd->attr == CMD_ATTR_HIDDEN))
+			vty_out(vty, "  %s%s", cmd->string, VTY_NEWLINE);
+	return CMD_SUCCESS;
+}
+
+#if 0
+/* Write current configuration into file. */
+DEFUN(config_write_file,
+      config_write_file_cmd,
+      "write file",
+      "Write running configuration to memory, network, or terminal\n"
+      "Write to configuration file\n")
+{
+	unsigned int i;
+	int fd;
+	struct cmd_node *node;
+	char *config_file;
+	char *config_file_tmp = NULL;
+	char *config_file_sav = NULL;
+	struct vty *file_vty;
+
+	/* Check and see if we are operating under vtysh configuration */
+	if (host.config == NULL) {
+		vty_out(vty, "Can't save to configuration file, using vtysh.%s",
+			VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+
+	/* Get filename. */
+	config_file = host.config;
+
+	config_file_sav =
+	    malloc(strlen(config_file) + strlen(CONF_BACKUP_EXT) + 1);
+	strcpy(config_file_sav, config_file);
+	strcat(config_file_sav, CONF_BACKUP_EXT);
+
+	config_file_tmp = malloc(strlen(config_file) + 8);
+	sprintf(config_file_tmp, "%s.XXXXXX", config_file);
+
+	/* Open file to configuration write. */
+	fd = mkstemp(config_file_tmp);
+	if (fd < 0) {
+		vty_out(vty, "Can't open configuration file %s.%s",
+			config_file_tmp, VTY_NEWLINE);
+		free(config_file_tmp);
+		free(config_file_sav);
+		return CMD_WARNING;
+	}
+
+	/* Make vty for configuration file. */
+	file_vty = vty_new();
+	file_vty->fd = fd;
+	file_vty->type = VTY_FILE;
+
+	/* Config file header print. */
+	vty_out(file_vty, "!\n! Zebra configuration saved from vty\n!   ");
+	//vty_time_print (file_vty, 1);
+	vty_out(file_vty, "!\n");
+
+	for (i = 0; i < vector_active(cmdvec); i++)
+		if ((node = vector_slot(cmdvec, i)) && node->func) {
+			if ((*node->func) (file_vty))
+				vty_out(file_vty, "!\n");
+		}
+	vty_close(file_vty);
+
+	if (unlink(config_file_sav) != 0)
+		if (errno != ENOENT) {
+			vty_out(vty,
+				"Can't unlink backup configuration file %s.%s",
+				config_file_sav, VTY_NEWLINE);
+			free(config_file_sav);
+			free(config_file_tmp);
+			unlink(config_file_tmp);
+			return CMD_WARNING;
+		}
+	if (link(config_file, config_file_sav) != 0) {
+		vty_out(vty, "Can't backup old configuration file %s.%s",
+			config_file_sav, VTY_NEWLINE);
+		free(config_file_sav);
+		free(config_file_tmp);
+		unlink(config_file_tmp);
+		return CMD_WARNING;
+	}
+	sync();
+	if (unlink(config_file) != 0) {
+		vty_out(vty, "Can't unlink configuration file %s.%s",
+			config_file, VTY_NEWLINE);
+		free(config_file_sav);
+		free(config_file_tmp);
+		unlink(config_file_tmp);
+		return CMD_WARNING;
+	}
+	if (link(config_file_tmp, config_file) != 0) {
+		vty_out(vty, "Can't save configuration file %s.%s", config_file,
+			VTY_NEWLINE);
+		free(config_file_sav);
+		free(config_file_tmp);
+		unlink(config_file_tmp);
+		return CMD_WARNING;
+	}
+	unlink(config_file_tmp);
+	sync();
+
+	free(config_file_sav);
+	free(config_file_tmp);
+
+	if (chmod(config_file, CONFIGFILE_MASK) != 0) {
+		vty_out(vty, "Can't chmod configuration file %s: %s (%d).%s",
+			config_file, safe_strerror(errno), errno, VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+
+	vty_out(vty, "Configuration saved to %s%s", config_file, VTY_NEWLINE);
+	return CMD_SUCCESS;
+}
+
+ALIAS(config_write_file,
+      config_write_cmd,
+      "write", "Write running configuration to memory, network, or terminal\n")
+
+    ALIAS(config_write_file,
+      config_write_memory_cmd,
+      "write memory",
+      "Write running configuration to memory, network, or terminal\n"
+      "Write configuration to the file (same as write file)\n")
+
+    ALIAS(config_write_file,
+      copy_runningconfig_startupconfig_cmd,
+      "copy running-config startup-config",
+      "Copy configuration\n"
+      "Copy running config to... \n"
+      "Copy running config to startup config (same as write file)\n")
+
+/* Write current configuration into the terminal. */
+    DEFUN(config_write_terminal,
+      config_write_terminal_cmd,
+      "write terminal",
+      "Write running configuration to memory, network, or terminal\n"
+      "Write to terminal\n")
+{
+	unsigned int i;
+	struct cmd_node *node;
+
+	if (vty->type == VTY_SHELL_SERV) {
+		for (i = 0; i < vector_active(cmdvec); i++)
+			if ((node = vector_slot(cmdvec, i)) && node->func
+			    && node->vtysh) {
+				if ((*node->func) (vty))
+					vty_out(vty, "!%s", VTY_NEWLINE);
+			}
+	} else {
+		vty_out(vty, "%sCurrent configuration:%s", VTY_NEWLINE,
+			VTY_NEWLINE);
+		vty_out(vty, "!%s", VTY_NEWLINE);
+
+		for (i = 0; i < vector_active(cmdvec); i++)
+			if ((node = vector_slot(cmdvec, i)) && node->func) {
+				if ((*node->func) (vty))
+					vty_out(vty, "!%s", VTY_NEWLINE);
+			}
+		vty_out(vty, "end%s", VTY_NEWLINE);
+	}
+	return CMD_SUCCESS;
+}
+
+/* Write current configuration into the terminal. */
+ALIAS(config_write_terminal,
+      show_running_config_cmd,
+      "show running-config", SHOW_STR "running configuration\n")
+
+/* Write startup configuration into the terminal. */
+    DEFUN(show_startup_config,
+      show_startup_config_cmd,
+      "show startup-config", SHOW_STR "Contentes of startup configuration\n")
+{
+	char buf[BUFSIZ];
+	FILE *confp;
+
+	confp = fopen(host.config, "r");
+	if (confp == NULL) {
+		vty_out(vty, "Can't open configuration file [%s]%s",
+			host.config, VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+
+	while (fgets(buf, BUFSIZ, confp)) {
+		char *cp = buf;
+
+		while (*cp != '\r' && *cp != '\n' && *cp != '\0')
+			cp++;
+		*cp = '\0';
+
+		vty_out(vty, "%s%s", buf, VTY_NEWLINE);
+	}
+
+	fclose(confp);
+
+	return CMD_SUCCESS;
+}
+#endif
+
+/* Hostname configuration */
+DEFUN(config_hostname,
+      hostname_cmd,
+      "hostname WORD",
+      "Set system's network name\n" "This system's network name\n")
+{
+	if (!isalpha((int)*argv[0])) {
+		vty_out(vty, "Please specify string starting with alphabet%s",
+			VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+
+	if (host.name)
+		free(host.name);
+
+	host.name = strdup(argv[0]);
+	return CMD_SUCCESS;
+}
+
+DEFUN(config_no_hostname,
+      no_hostname_cmd,
+      "no hostname [HOSTNAME]",
+      NO_STR "Reset system's network name\n" "Host name of this router\n")
+{
+	if (host.name)
+		free(host.name);
+	host.name = NULL;
+	return CMD_SUCCESS;
+}
+
+/* VTY interface password set. */
+DEFUN(config_password, password_cmd,
+      "password (8|) WORD",
+      "Assign the terminal connection password\n"
+      "Specifies a HIDDEN password will follow\n"
+      "dummy string \n" "The HIDDEN line password string\n")
+{
+	/* Argument check. */
+	if (argc == 0) {
+		vty_out(vty, "Please specify password.%s", VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+
+	if (argc == 2) {
+		if (*argv[0] == '8') {
+			if (host.password)
+				free(host.password);
+			host.password = NULL;
+			if (host.password_encrypt)
+				free(host.password_encrypt);
+			host.password_encrypt = strdup(strdup(argv[1]));
+			return CMD_SUCCESS;
+		} else {
+			vty_out(vty, "Unknown encryption type.%s", VTY_NEWLINE);
+			return CMD_WARNING;
+		}
+	}
+
+	if (!isalnum((int)*argv[0])) {
+		vty_out(vty,
+			"Please specify string starting with alphanumeric%s",
+			VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+
+	if (host.password)
+		free(host.password);
+	host.password = NULL;
+
+	if (host.encrypt) {
+		if (host.password_encrypt)
+			free(host.password_encrypt);
+		host.password_encrypt = strdup(zencrypt(argv[0]));
+	} else
+		host.password = strdup(argv[0]);
+
+	return CMD_SUCCESS;
+}
+
+ALIAS(config_password, password_text_cmd,
+      "password LINE",
+      "Assign the terminal connection password\n"
+      "The UNENCRYPTED (cleartext) line password\n")
+
+/* VTY enable password set. */
+    DEFUN(config_enable_password, enable_password_cmd,
+      "enable password (8|) WORD",
+      "Modify enable password parameters\n"
+      "Assign the privileged level password\n"
+      "Specifies a HIDDEN password will follow\n"
+      "dummy string \n" "The HIDDEN 'enable' password string\n")
+{
+	/* Argument check. */
+	if (argc == 0) {
+		vty_out(vty, "Please specify password.%s", VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+
+	/* Crypt type is specified. */
+	if (argc == 2) {
+		if (*argv[0] == '8') {
+			if (host.enable)
+				free(host.enable);
+			host.enable = NULL;
+
+			if (host.enable_encrypt)
+				free(host.enable_encrypt);
+			host.enable_encrypt = strdup(argv[1]);
+
+			return CMD_SUCCESS;
+		} else {
+			vty_out(vty, "Unknown encryption type.%s", VTY_NEWLINE);
+			return CMD_WARNING;
+		}
+	}
+
+	if (!isalnum((int)*argv[0])) {
+		vty_out(vty,
+			"Please specify string starting with alphanumeric%s",
+			VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+
+	if (host.enable)
+		free(host.enable);
+	host.enable = NULL;
+
+	/* Plain password input. */
+	if (host.encrypt) {
+		if (host.enable_encrypt)
+			free(host.enable_encrypt);
+		host.enable_encrypt = strdup(zencrypt(argv[0]));
+	} else
+		host.enable = strdup(argv[0]);
+
+	return CMD_SUCCESS;
+}
+
+ALIAS(config_enable_password,
+      enable_password_text_cmd,
+      "enable password LINE",
+      "Modify enable password parameters\n"
+      "Assign the privileged level password\n"
+      "The UNENCRYPTED (cleartext) 'enable' password\n")
+
+/* VTY enable password delete. */
+    DEFUN(no_config_enable_password, no_enable_password_cmd,
+      "no enable password",
+      NO_STR
+      "Modify enable password parameters\n"
+      "Assign the privileged level password\n")
+{
+	if (host.enable)
+		free(host.enable);
+	host.enable = NULL;
+
+	if (host.enable_encrypt)
+		free(host.enable_encrypt);
+	host.enable_encrypt = NULL;
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(service_password_encrypt,
+      service_password_encrypt_cmd,
+      "service password-encryption",
+      "Set up miscellaneous service\n" "Enable encrypted passwords\n")
+{
+	if (host.encrypt)
+		return CMD_SUCCESS;
+
+	host.encrypt = 1;
+
+	if (host.password) {
+		if (host.password_encrypt)
+			free(host.password_encrypt);
+		host.password_encrypt = strdup(zencrypt(host.password));
+	}
+	if (host.enable) {
+		if (host.enable_encrypt)
+			free(host.enable_encrypt);
+		host.enable_encrypt = strdup(zencrypt(host.enable));
+	}
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(no_service_password_encrypt,
+      no_service_password_encrypt_cmd,
+      "no service password-encryption",
+      NO_STR "Set up miscellaneous service\n" "Enable encrypted passwords\n")
+{
+	if (!host.encrypt)
+		return CMD_SUCCESS;
+
+	host.encrypt = 0;
+
+	if (host.password_encrypt)
+		free(host.password_encrypt);
+	host.password_encrypt = NULL;
+
+	if (host.enable_encrypt)
+		free(host.enable_encrypt);
+	host.enable_encrypt = NULL;
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(config_terminal_length, config_terminal_length_cmd,
+      "terminal length <0-512>",
+      "Set terminal line parameters\n"
+      "Set number of lines on a screen\n"
+      "Number of lines on screen (0 for no pausing)\n")
+{
+	int lines;
+	char *endptr = NULL;
+
+	lines = strtol(argv[0], &endptr, 10);
+	if (lines < 0 || lines > 512 || *endptr != '\0') {
+		vty_out(vty, "length is malformed%s", VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+	vty->lines = lines;
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(config_terminal_no_length, config_terminal_no_length_cmd,
+      "terminal no length",
+      "Set terminal line parameters\n"
+      NO_STR "Set number of lines on a screen\n")
+{
+	vty->lines = -1;
+	return CMD_SUCCESS;
+}
+
+DEFUN(service_terminal_length, service_terminal_length_cmd,
+      "service terminal-length <0-512>",
+      "Set up miscellaneous service\n"
+      "System wide terminal length configuration\n"
+      "Number of lines of VTY (0 means no line control)\n")
+{
+	int lines;
+	char *endptr = NULL;
+
+	lines = strtol(argv[0], &endptr, 10);
+	if (lines < 0 || lines > 512 || *endptr != '\0') {
+		vty_out(vty, "length is malformed%s", VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+	host.lines = lines;
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(no_service_terminal_length, no_service_terminal_length_cmd,
+      "no service terminal-length [<0-512>]",
+      NO_STR
+      "Set up miscellaneous service\n"
+      "System wide terminal length configuration\n"
+      "Number of lines of VTY (0 means no line control)\n")
+{
+	host.lines = -1;
+	return CMD_SUCCESS;
+}
+
+DEFUN_HIDDEN(do_echo,
+	     echo_cmd,
+	     "echo .MESSAGE",
+	     "Echo a message back to the vty\n" "The message to echo\n")
+{
+	char *message;
+
+	vty_out(vty, "%s%s",
+		((message =
+		  argv_concat(argv, argc, 0)) ? message : ""), VTY_NEWLINE);
+	if (message)
+		free(message);
+	return CMD_SUCCESS;
+}
+
+#if 0
+DEFUN(config_logmsg,
+      config_logmsg_cmd,
+      "logmsg " LOG_LEVELS " .MESSAGE",
+      "Send a message to enabled logging destinations\n"
+      LOG_LEVEL_DESC "The message to send\n")
+{
+	int level;
+	char *message;
+
+	if ((level = level_match(argv[0])) == ZLOG_DISABLED)
+		return CMD_ERR_NO_MATCH;
+
+	zlog(NULL, level,
+	     ((message = argv_concat(argv, argc, 1)) ? message : ""));
+	if (message)
+		free(message);
+	return CMD_SUCCESS;
+}
+
+DEFUN(show_logging,
+      show_logging_cmd,
+      "show logging", SHOW_STR "Show current logging configuration\n")
+{
+	struct zlog *zl = zlog_default;
+
+	vty_out(vty, "Syslog logging: ");
+	if (zl->maxlvl[ZLOG_DEST_SYSLOG] == ZLOG_DISABLED)
+		vty_out(vty, "disabled");
+	else
+		vty_out(vty, "level %s, facility %s, ident %s",
+			zlog_priority[zl->maxlvl[ZLOG_DEST_SYSLOG]],
+			facility_name(zl->facility), zl->ident);
+	vty_out(vty, "%s", VTY_NEWLINE);
+
+	vty_out(vty, "Stdout logging: ");
+	if (zl->maxlvl[ZLOG_DEST_STDOUT] == ZLOG_DISABLED)
+		vty_out(vty, "disabled");
+	else
+		vty_out(vty, "level %s",
+			zlog_priority[zl->maxlvl[ZLOG_DEST_STDOUT]]);
+	vty_out(vty, "%s", VTY_NEWLINE);
+
+	vty_out(vty, "Monitor logging: ");
+	if (zl->maxlvl[ZLOG_DEST_MONITOR] == ZLOG_DISABLED)
+		vty_out(vty, "disabled");
+	else
+		vty_out(vty, "level %s",
+			zlog_priority[zl->maxlvl[ZLOG_DEST_MONITOR]]);
+	vty_out(vty, "%s", VTY_NEWLINE);
+
+	vty_out(vty, "File logging: ");
+	if ((zl->maxlvl[ZLOG_DEST_FILE] == ZLOG_DISABLED) || !zl->fp)
+		vty_out(vty, "disabled");
+	else
+		vty_out(vty, "level %s, filename %s",
+			zlog_priority[zl->maxlvl[ZLOG_DEST_FILE]],
+			zl->filename);
+	vty_out(vty, "%s", VTY_NEWLINE);
+
+	vty_out(vty, "Protocol name: %s%s",
+		zlog_proto_names[zl->protocol], VTY_NEWLINE);
+	vty_out(vty, "Record priority: %s%s",
+		(zl->record_priority ? "enabled" : "disabled"), VTY_NEWLINE);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(config_log_stdout,
+      config_log_stdout_cmd,
+      "log stdout", "Logging control\n" "Set stdout logging level\n")
+{
+	zlog_set_level(NULL, ZLOG_DEST_STDOUT, zlog_default->default_lvl);
+	return CMD_SUCCESS;
+}
+
+DEFUN(config_log_stdout_level,
+      config_log_stdout_level_cmd,
+      "log stdout " LOG_LEVELS,
+      "Logging control\n" "Set stdout logging level\n" LOG_LEVEL_DESC)
+{
+	int level;
+
+	if ((level = level_match(argv[0])) == ZLOG_DISABLED)
+		return CMD_ERR_NO_MATCH;
+	zlog_set_level(NULL, ZLOG_DEST_STDOUT, level);
+	return CMD_SUCCESS;
+}
+
+DEFUN(no_config_log_stdout,
+      no_config_log_stdout_cmd,
+      "no log stdout [LEVEL]",
+      NO_STR "Logging control\n" "Cancel logging to stdout\n" "Logging level\n")
+{
+	zlog_set_level(NULL, ZLOG_DEST_STDOUT, ZLOG_DISABLED);
+	return CMD_SUCCESS;
+}
+
+DEFUN(config_log_monitor,
+      config_log_monitor_cmd,
+      "log monitor",
+      "Logging control\n" "Set terminal line (monitor) logging level\n")
+{
+	zlog_set_level(NULL, ZLOG_DEST_MONITOR, zlog_default->default_lvl);
+	return CMD_SUCCESS;
+}
+
+DEFUN(config_log_monitor_level,
+      config_log_monitor_level_cmd,
+      "log monitor " LOG_LEVELS,
+      "Logging control\n"
+      "Set terminal line (monitor) logging level\n" LOG_LEVEL_DESC)
+{
+	int level;
+
+	if ((level = level_match(argv[0])) == ZLOG_DISABLED)
+		return CMD_ERR_NO_MATCH;
+	zlog_set_level(NULL, ZLOG_DEST_MONITOR, level);
+	return CMD_SUCCESS;
+}
+
+DEFUN(no_config_log_monitor,
+      no_config_log_monitor_cmd,
+      "no log monitor [LEVEL]",
+      NO_STR
+      "Logging control\n"
+      "Disable terminal line (monitor) logging\n" "Logging level\n")
+{
+	zlog_set_level(NULL, ZLOG_DEST_MONITOR, ZLOG_DISABLED);
+	return CMD_SUCCESS;
+}
+
+static int set_log_file(struct vty *vty, const char *fname, int loglevel)
+{
+	int ret;
+	char *p = NULL;
+	const char *fullpath;
+
+	/* Path detection. */
+	if (!IS_DIRECTORY_SEP(*fname)) {
+		char cwd[MAXPATHLEN + 1];
+		cwd[MAXPATHLEN] = '\0';
+
+		if (getcwd(cwd, MAXPATHLEN) == NULL) {
+			zlog_err("config_log_file: Unable to alloc mem!");
+			return CMD_WARNING;
+		}
+
+		if ((p = malloc(strlen(cwd) + strlen(fname) + 2))
+		    == NULL) {
+			zlog_err("config_log_file: Unable to alloc mem!");
+			return CMD_WARNING;
+		}
+		sprintf(p, "%s/%s", cwd, fname);
+		fullpath = p;
+	} else
+		fullpath = fname;
+
+	ret = zlog_set_file(NULL, fullpath, loglevel);
+
+	if (p)
+		free(p);
+
+	if (!ret) {
+		vty_out(vty, "can't open logfile %s\n", fname);
+		return CMD_WARNING;
+	}
+
+	if (host.logfile)
+		free(host.logfile);
+
+	host.logfile = strdup(fname);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(config_log_file,
+      config_log_file_cmd,
+      "log file FILENAME",
+      "Logging control\n" "Logging to file\n" "Logging filename\n")
+{
+	return set_log_file(vty, argv[0], zlog_default->default_lvl);
+}
+
+DEFUN(config_log_file_level,
+      config_log_file_level_cmd,
+      "log file FILENAME " LOG_LEVELS,
+      "Logging control\n"
+      "Logging to file\n" "Logging filename\n" LOG_LEVEL_DESC)
+{
+	int level;
+
+	if ((level = level_match(argv[1])) == ZLOG_DISABLED)
+		return CMD_ERR_NO_MATCH;
+	return set_log_file(vty, argv[0], level);
+}
+
+DEFUN(no_config_log_file,
+      no_config_log_file_cmd,
+      "no log file [FILENAME]",
+      NO_STR
+      "Logging control\n" "Cancel logging to file\n" "Logging file name\n")
+{
+	zlog_reset_file(NULL);
+
+	if (host.logfile)
+		free(host.logfile);
+
+	host.logfile = NULL;
+
+	return CMD_SUCCESS;
+}
+
+ALIAS(no_config_log_file,
+      no_config_log_file_level_cmd,
+      "no log file FILENAME LEVEL",
+      NO_STR
+      "Logging control\n"
+      "Cancel logging to file\n" "Logging file name\n" "Logging level\n")
+
+    DEFUN(config_log_syslog,
+      config_log_syslog_cmd,
+      "log syslog", "Logging control\n" "Set syslog logging level\n")
+{
+	zlog_set_level(NULL, ZLOG_DEST_SYSLOG, zlog_default->default_lvl);
+	return CMD_SUCCESS;
+}
+
+DEFUN(config_log_syslog_level,
+      config_log_syslog_level_cmd,
+      "log syslog " LOG_LEVELS,
+      "Logging control\n" "Set syslog logging level\n" LOG_LEVEL_DESC)
+{
+	int level;
+
+	if ((level = level_match(argv[0])) == ZLOG_DISABLED)
+		return CMD_ERR_NO_MATCH;
+	zlog_set_level(NULL, ZLOG_DEST_SYSLOG, level);
+	return CMD_SUCCESS;
+}
+
+DEFUN_DEPRECATED(config_log_syslog_facility,
+		 config_log_syslog_facility_cmd,
+		 "log syslog facility " LOG_FACILITIES,
+		 "Logging control\n"
+		 "Logging goes to syslog\n"
+		 "(Deprecated) Facility parameter for syslog messages\n"
+		 LOG_FACILITY_DESC)
+{
+	int facility;
+
+	if ((facility = facility_match(argv[0])) < 0)
+		return CMD_ERR_NO_MATCH;
+
+	zlog_set_level(NULL, ZLOG_DEST_SYSLOG, zlog_default->default_lvl);
+	zlog_default->facility = facility;
+	return CMD_SUCCESS;
+}
+
+DEFUN(no_config_log_syslog,
+      no_config_log_syslog_cmd,
+      "no log syslog [LEVEL]",
+      NO_STR "Logging control\n" "Cancel logging to syslog\n" "Logging level\n")
+{
+	zlog_set_level(NULL, ZLOG_DEST_SYSLOG, ZLOG_DISABLED);
+	return CMD_SUCCESS;
+}
+
+ALIAS(no_config_log_syslog,
+      no_config_log_syslog_facility_cmd,
+      "no log syslog facility " LOG_FACILITIES,
+      NO_STR
+      "Logging control\n"
+      "Logging goes to syslog\n"
+      "Facility parameter for syslog messages\n" LOG_FACILITY_DESC)
+
+    DEFUN(config_log_facility,
+      config_log_facility_cmd,
+      "log facility " LOG_FACILITIES,
+      "Logging control\n"
+      "Facility parameter for syslog messages\n" LOG_FACILITY_DESC)
+{
+	int facility;
+
+	if ((facility = facility_match(argv[0])) < 0)
+		return CMD_ERR_NO_MATCH;
+	zlog_default->facility = facility;
+	return CMD_SUCCESS;
+}
+
+DEFUN(no_config_log_facility,
+      no_config_log_facility_cmd,
+      "no log facility [FACILITY]",
+      NO_STR
+      "Logging control\n"
+      "Reset syslog facility to default (daemon)\n" "Syslog facility\n")
+{
+	zlog_default->facility = LOG_DAEMON;
+	return CMD_SUCCESS;
+}
+
+DEFUN_DEPRECATED(config_log_trap,
+		 config_log_trap_cmd,
+		 "log trap " LOG_LEVELS,
+		 "Logging control\n"
+		 "(Deprecated) Set logging level and default for all destinations\n"
+		 LOG_LEVEL_DESC)
+{
+	int new_level;
+	int i;
+
+	if ((new_level = level_match(argv[0])) == ZLOG_DISABLED)
+		return CMD_ERR_NO_MATCH;
+
+	zlog_default->default_lvl = new_level;
+	for (i = 0; i < ZLOG_NUM_DESTS; i++)
+		if (zlog_default->maxlvl[i] != ZLOG_DISABLED)
+			zlog_default->maxlvl[i] = new_level;
+	return CMD_SUCCESS;
+}
+
+DEFUN_DEPRECATED(no_config_log_trap,
+		 no_config_log_trap_cmd,
+		 "no log trap [LEVEL]",
+		 NO_STR
+		 "Logging control\n"
+		 "Permit all logging information\n" "Logging level\n")
+{
+	zlog_default->default_lvl = LOG_DEBUG;
+	return CMD_SUCCESS;
+}
+
+DEFUN(config_log_record_priority,
+      config_log_record_priority_cmd,
+      "log record-priority",
+      "Logging control\n"
+      "Log the priority of the message within the message\n")
+{
+	zlog_default->record_priority = 1;
+	return CMD_SUCCESS;
+}
+
+DEFUN(no_config_log_record_priority,
+      no_config_log_record_priority_cmd,
+      "no log record-priority",
+      NO_STR
+      "Logging control\n"
+      "Do not log the priority of the message within the message\n")
+{
+	zlog_default->record_priority = 0;
+	return CMD_SUCCESS;
+}
+#endif
+
+DEFUN(banner_motd_file,
+      banner_motd_file_cmd,
+      "banner motd file [FILE]",
+      "Set banner\n" "Banner for motd\n" "Banner from a file\n" "Filename\n")
+{
+	if (host.motdfile)
+		free(host.motdfile);
+	host.motdfile = strdup(argv[0]);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(banner_motd_default,
+      banner_motd_default_cmd,
+      "banner motd default",
+      "Set banner string\n" "Strings for motd\n" "Default string\n")
+{
+	host.motd = default_motd;
+	return CMD_SUCCESS;
+}
+
+DEFUN(no_banner_motd,
+      no_banner_motd_cmd,
+      "no banner motd", NO_STR "Set banner string\n" "Strings for motd\n")
+{
+	host.motd = NULL;
+	if (host.motdfile)
+		free(host.motdfile);
+	host.motdfile = NULL;
+	return CMD_SUCCESS;
+}
+
+/* Set config filename.  Called from vty.c */
+void host_config_set(char *filename)
+{
+	host.config = strdup(filename);
+}
+
+void install_default(enum node_type node)
+{
+	install_element(node, &config_exit_cmd);
+	install_element(node, &config_quit_cmd);
+	install_element(node, &config_end_cmd);
+	install_element(node, &config_help_cmd);
+	install_element(node, &config_list_cmd);
+
+#if 0
+	install_element(node, &config_write_terminal_cmd);
+	install_element(node, &config_write_file_cmd);
+	install_element(node, &config_write_memory_cmd);
+	install_element(node, &config_write_cmd);
+	install_element(node, &show_running_config_cmd);
+#endif
+}
+
+/* Initialize command interface. Install basic nodes and commands. */
+void cmd_init(int terminal)
+{
+	/* Allocate initial top vector of commands. */
+	cmdvec = vector_init(VECTOR_MIN_SIZE);
+
+	/* Default host value settings. */
+	host.name = NULL;
+	//host.password = NULL;
+	host.password = "foo";
+	host.enable = NULL;
+	host.logfile = NULL;
+	host.config = NULL;
+	host.lines = -1;
+	host.motd = default_motd;
+	host.motdfile = NULL;
+
+	/* Install top nodes. */
+	install_node(&view_node, NULL);
+	install_node(&enable_node, NULL);
+	install_node(&auth_node, NULL);
+	install_node(&auth_enable_node, NULL);
+	install_node(&config_node, config_write_host);
+
+	/* Each node's basic commands. */
+	install_element(VIEW_NODE, &show_version_cmd);
+	if (terminal) {
+		install_element(VIEW_NODE, &config_list_cmd);
+		install_element(VIEW_NODE, &config_exit_cmd);
+		install_element(VIEW_NODE, &config_quit_cmd);
+		install_element(VIEW_NODE, &config_help_cmd);
+		install_element(VIEW_NODE, &config_enable_cmd);
+		install_element(VIEW_NODE, &config_terminal_length_cmd);
+		install_element(VIEW_NODE, &config_terminal_no_length_cmd);
+		install_element(VIEW_NODE, &echo_cmd);
+	}
+
+	if (terminal) {
+		install_default(ENABLE_NODE);
+		install_element(ENABLE_NODE, &config_disable_cmd);
+		install_element(ENABLE_NODE, &config_terminal_cmd);
+		//install_element (ENABLE_NODE, &copy_runningconfig_startupconfig_cmd);
+	}
+	//install_element (ENABLE_NODE, &show_startup_config_cmd);
+	install_element(ENABLE_NODE, &show_version_cmd);
+
+	if (terminal) {
+		install_element(ENABLE_NODE, &config_terminal_length_cmd);
+		install_element(ENABLE_NODE, &config_terminal_no_length_cmd);
+		install_element(ENABLE_NODE, &echo_cmd);
+
+		install_default(CONFIG_NODE);
+	}
+
+	install_element(CONFIG_NODE, &hostname_cmd);
+	install_element(CONFIG_NODE, &no_hostname_cmd);
+
+	if (terminal) {
+		install_element(CONFIG_NODE, &password_cmd);
+		install_element(CONFIG_NODE, &password_text_cmd);
+		install_element(CONFIG_NODE, &enable_password_cmd);
+		install_element(CONFIG_NODE, &enable_password_text_cmd);
+		install_element(CONFIG_NODE, &no_enable_password_cmd);
+
+		install_element(CONFIG_NODE, &service_password_encrypt_cmd);
+		install_element(CONFIG_NODE, &no_service_password_encrypt_cmd);
+		install_element(CONFIG_NODE, &banner_motd_default_cmd);
+		install_element(CONFIG_NODE, &banner_motd_file_cmd);
+		install_element(CONFIG_NODE, &no_banner_motd_cmd);
+		install_element(CONFIG_NODE, &service_terminal_length_cmd);
+		install_element(CONFIG_NODE, &no_service_terminal_length_cmd);
+
+	}
+	srand(time(NULL));
+}
diff --git a/src/vty/vector.c b/src/vty/vector.c
new file mode 100644
index 0000000..7687010
--- /dev/null
+++ b/src/vty/vector.c
@@ -0,0 +1,186 @@
+/* Generic vector 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.
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <vty/vector.h>
+#include <memory.h>
+
+/* Initialize vector : allocate memory and return vector. */
+vector vector_init(unsigned int size)
+{
+	vector v = calloc(1, sizeof(struct _vector));
+	if (!v)
+		return NULL;
+
+	/* allocate at least one slot */
+	if (size == 0)
+		size = 1;
+
+	v->alloced = size;
+	v->active = 0;
+	v->index = calloc(1, sizeof(void *) * size);
+	if (!v->index) {
+		free(v);
+		return NULL;
+	}
+	return v;
+}
+
+void vector_only_wrapper_free(vector v)
+{
+	free(v);
+}
+
+void vector_only_index_free(void *index)
+{
+	free(index);
+}
+
+void vector_free(vector v)
+{
+	free(v->index);
+	free(v);
+}
+
+vector vector_copy(vector v)
+{
+	unsigned int size;
+	vector new = calloc(1, sizeof(struct _vector));
+	if (!new)
+		return NULL;
+
+	new->active = v->active;
+	new->alloced = v->alloced;
+
+	size = sizeof(void *) * (v->alloced);
+	new->index = calloc(1, size);
+	if (!new->index) {
+		free(new);
+		return NULL;
+	}
+	memcpy(new->index, v->index, size);
+
+	return new;
+}
+
+/* Check assigned index, and if it runs short double index pointer */
+void vector_ensure(vector v, unsigned int num)
+{
+	if (v->alloced > num)
+		return;
+
+	v->index = realloc(v->index, sizeof(void *) * (v->alloced * 2));
+	memset(&v->index[v->alloced], 0, sizeof(void *) * v->alloced);
+	v->alloced *= 2;
+
+	if (v->alloced <= num)
+		vector_ensure(v, num);
+}
+
+/* This function only returns next empty slot index.  It dose not mean
+   the slot's index memory is assigned, please call vector_ensure()
+   after calling this function. */
+int vector_empty_slot(vector v)
+{
+	unsigned int i;
+
+	if (v->active == 0)
+		return 0;
+
+	for (i = 0; i < v->active; i++)
+		if (v->index[i] == 0)
+			return i;
+
+	return i;
+}
+
+/* Set value to the smallest empty slot. */
+int vector_set(vector v, void *val)
+{
+	unsigned int i;
+
+	i = vector_empty_slot(v);
+	vector_ensure(v, i);
+
+	v->index[i] = val;
+
+	if (v->active <= i)
+		v->active = i + 1;
+
+	return i;
+}
+
+/* Set value to specified index slot. */
+int vector_set_index(vector v, unsigned int i, void *val)
+{
+	vector_ensure(v, i);
+
+	v->index[i] = val;
+
+	if (v->active <= i)
+		v->active = i + 1;
+
+	return i;
+}
+
+/* Look up vector.  */
+void *vector_lookup(vector v, unsigned int i)
+{
+	if (i >= v->active)
+		return NULL;
+	return v->index[i];
+}
+
+/* Lookup vector, ensure it. */
+void *vector_lookup_ensure(vector v, unsigned int i)
+{
+	vector_ensure(v, i);
+	return v->index[i];
+}
+
+/* Unset value at specified index slot. */
+void vector_unset(vector v, unsigned int i)
+{
+	if (i >= v->alloced)
+		return;
+
+	v->index[i] = NULL;
+
+	if (i + 1 == v->active) {
+		v->active--;
+		while (i && v->index[--i] == NULL && v->active--) ;	/* Is this ugly ? */
+	}
+}
+
+/* Count the number of not emplty slot. */
+unsigned int vector_count(vector v)
+{
+	unsigned int i;
+	unsigned count = 0;
+
+	for (i = 0; i < v->active; i++)
+		if (v->index[i] != NULL)
+			count++;
+
+	return count;
+}
diff --git a/src/vty/vty.c b/src/vty/vty.c
new file mode 100644
index 0000000..66cc13b
--- /dev/null
+++ b/src/vty/vty.c
@@ -0,0 +1,1645 @@
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <ctype.h>
+#include <termios.h>
+
+#include <sys/utsname.h>
+#include <sys/param.h>
+
+#include <arpa/telnet.h>
+
+#include "cardshell.h"
+#include <vty/vty.h>
+#include <vty/command.h>
+#include <vty/buffer.h>
+
+/* Vty events */
+enum event {
+	VTY_SERV,
+	VTY_READ,
+	VTY_WRITE,
+	VTY_TIMEOUT_RESET,
+#ifdef VTYSH
+	VTYSH_SERV,
+	VTYSH_READ,
+	VTYSH_WRITE
+#endif				/* VTYSH */
+};
+
+extern struct host host;
+
+/* Vector which store each vty structure. */
+static vector vtyvec;
+
+vector Vvty_serv_thread;
+
+char *vty_cwd = NULL;
+
+/* Configure lock. */
+static int vty_config;
+
+static int no_password_check = 1;
+
+static void vty_clear_buf(struct vty *vty)
+{
+	memset(vty->buf, 0, vty->max);
+}
+
+/* Allocate new vty struct. */
+struct vty *vty_new()
+{
+	struct vty *new = malloc(sizeof(struct vty));
+
+	if (!new)
+		goto out;
+
+	new->obuf = buffer_new(0);	/* Use default buffer size. */
+	if (!new->obuf)
+		goto out_new;
+	new->buf = calloc(1, VTY_BUFSIZ);
+	if (!new->buf)
+		goto out_obuf;
+
+	new->max = VTY_BUFSIZ;
+
+	return new;
+
+out_obuf:
+	free(new->obuf);
+out_new:
+	free(new);
+	new = NULL;
+out:
+	return new;
+}
+
+/* Authentication of vty */
+static void vty_auth(struct vty *vty, char *buf)
+{
+	char *passwd = NULL;
+	enum node_type next_node = 0;
+	int fail;
+	char *crypt(const char *, const char *);
+
+	switch (vty->node) {
+	case AUTH_NODE:
+		if (host.encrypt)
+			passwd = host.password_encrypt;
+		else
+			passwd = host.password;
+		if (host.advanced)
+			next_node = host.enable ? VIEW_NODE : ENABLE_NODE;
+		else
+			next_node = VIEW_NODE;
+		break;
+	case AUTH_ENABLE_NODE:
+		if (host.encrypt)
+			passwd = host.enable_encrypt;
+		else
+			passwd = host.enable;
+		next_node = ENABLE_NODE;
+		break;
+	}
+
+	if (passwd) {
+		if (host.encrypt)
+			fail = strcmp(crypt(buf, passwd), passwd);
+		else
+			fail = strcmp(buf, passwd);
+	} else
+		fail = 1;
+
+	if (!fail) {
+		vty->fail = 0;
+		vty->node = next_node;	/* Success ! */
+	} else {
+		vty->fail++;
+		if (vty->fail >= 3) {
+			if (vty->node == AUTH_NODE) {
+				vty_out(vty,
+					"%% Bad passwords, too many failures!%s",
+					VTY_NEWLINE);
+				vty->status = VTY_CLOSE;
+			} else {
+				/* AUTH_ENABLE_NODE */
+				vty->fail = 0;
+				vty_out(vty,
+					"%% Bad enable passwords, too many failures!%s",
+					VTY_NEWLINE);
+				vty->node = VIEW_NODE;
+			}
+		}
+	}
+}
+
+/* Close vty interface. */
+void vty_close(struct vty *vty)
+{
+	int i;
+
+	/* Flush buffer. */
+	buffer_flush_all(vty->obuf, vty->fd);
+
+	/* Free input buffer. */
+	buffer_free(vty->obuf);
+
+	/* Free command history. */
+	for (i = 0; i < VTY_MAXHIST; i++)
+		if (vty->hist[i])
+			free(vty->hist[i]);
+
+	/* Unset vector. */
+	vector_unset(vtyvec, vty->fd);
+
+	/* Close socket. */
+	if (vty->fd > 0)
+		close(vty->fd);
+
+	if (vty->buf)
+		free(vty->buf);
+
+	/* Check configure. */
+	vty_config_unlock(vty);
+
+	/* OK free vty. */
+	free(vty);
+}
+
+int vty_shell(struct vty *vty)
+{
+	return vty->type == VTY_SHELL ? 1 : 0;
+}
+
+
+/* VTY standard output function. */
+int vty_out(struct vty *vty, const char *format, ...)
+{
+	va_list args;
+	int len = 0;
+	int size = 1024;
+	char buf[1024];
+	char *p = NULL;
+
+	if (vty_shell(vty)) {
+		va_start(args, format);
+		vprintf(format, args);
+		va_end(args);
+	} else {
+		/* Try to write to initial buffer.  */
+		va_start(args, format);
+		len = vsnprintf(buf, sizeof buf, format, args);
+		va_end(args);
+
+		/* Initial buffer is not enough.  */
+		if (len < 0 || len >= size) {
+			while (1) {
+				if (len > -1)
+					size = len + 1;
+				else
+					size = size * 2;
+
+				p = realloc(p, size);
+				if (!p)
+					return -1;
+
+				va_start(args, format);
+				len = vsnprintf(p, size, format, args);
+				va_end(args);
+
+				if (len > -1 && len < size)
+					break;
+			}
+		}
+
+		/* When initial buffer is enough to store all output.  */
+		if (!p)
+			p = buf;
+
+		/* Pointer p must point out buffer. */
+		buffer_put(vty->obuf, (u_char *) p, len);
+
+		/* If p is not different with buf, it is allocated buffer.  */
+		if (p != buf)
+			free(p);
+	}
+
+	return len;
+}
+
+int vty_out_newline(struct vty *vty)
+{
+	char *p = vty_newline(vty);
+	buffer_put(vty->obuf, p, strlen(p));
+}
+
+int vty_config_lock(struct vty *vty)
+{
+	if (vty_config == 0) {
+		vty->config = 1;
+		vty_config = 1;
+	}
+	return vty->config;
+}
+
+int vty_config_unlock(struct vty *vty)
+{
+	if (vty_config == 1 && vty->config == 1) {
+		vty->config = 0;
+		vty_config = 0;
+	}
+	return vty->config;
+}
+
+static void vty_event(enum event event, int sock, struct vty *vty)
+{
+	fprintf(stdout, "vty_event(%d, %d, %p)\n", event, sock, vty);
+	buffer_flush_all(vty->obuf, sock);
+}
+
+/* Say hello to vty interface. */
+void vty_hello(struct vty *vty)
+{
+	if (host.motdfile) {
+		FILE *f;
+		char buf[4096];
+
+		f = fopen(host.motdfile, "r");
+		if (f) {
+			while (fgets(buf, sizeof(buf), f)) {
+				char *s;
+				/* work backwards to ignore trailling isspace() */
+				for (s = buf + strlen(buf);
+				     (s > buf) && isspace(*(s - 1)); s--) ;
+				*s = '\0';
+				vty_out(vty, "%s%s", buf, VTY_NEWLINE);
+			}
+			fclose(f);
+		} else
+			vty_out(vty, "MOTD file not found%s", VTY_NEWLINE);
+	} else if (host.motd)
+		vty_out(vty, host.motd);
+}
+
+/* Put out prompt and wait input from user. */
+static void vty_prompt(struct vty *vty)
+{
+	struct utsname names;
+	const char *hostname;
+
+	if (vty->type == VTY_TERM) {
+		hostname = host.name;
+		if (!hostname) {
+			uname(&names);
+			hostname = names.nodename;
+		}
+		vty_out(vty, cmd_prompt(vty->node), hostname);
+	}
+}
+
+/* Command execution over the vty interface. */
+static int vty_command(struct vty *vty, char *buf)
+{
+	int ret;
+	vector vline;
+
+	/* Split readline string up into the vector */
+	vline = cmd_make_strvec(buf);
+
+	if (vline == NULL)
+		return CMD_SUCCESS;
+
+	ret = cmd_execute_command(vline, vty, NULL, 0);
+	if (ret != CMD_SUCCESS)
+		switch (ret) {
+		case CMD_WARNING:
+			if (vty->type == VTY_FILE)
+				vty_out(vty, "Warning...%s", VTY_NEWLINE);
+			break;
+		case CMD_ERR_AMBIGUOUS:
+			vty_out(vty, "%% Ambiguous command.%s", VTY_NEWLINE);
+			break;
+		case CMD_ERR_NO_MATCH:
+			vty_out(vty, "%% Unknown command.%s", VTY_NEWLINE);
+			break;
+		case CMD_ERR_INCOMPLETE:
+			vty_out(vty, "%% Command incomplete.%s", VTY_NEWLINE);
+			break;
+		}
+	cmd_free_strvec(vline);
+
+	return ret;
+}
+
+static const char telnet_backward_char = 0x08;
+static const char telnet_space_char = ' ';
+
+/* Basic function to write buffer to vty. */
+static void vty_write(struct vty *vty, const char *buf, size_t nbytes)
+{
+	if ((vty->node == AUTH_NODE) || (vty->node == AUTH_ENABLE_NODE))
+		return;
+
+	/* Should we do buffering here ?  And make vty_flush (vty) ? */
+	buffer_put(vty->obuf, buf, nbytes);
+}
+
+/* Ensure length of input buffer.  Is buffer is short, double it. */
+static void vty_ensure(struct vty *vty, int length)
+{
+	if (vty->max <= length) {
+		vty->max *= 2;
+		vty->buf = realloc(vty->buf, vty->max);
+		// FIXME: check return
+	}
+}
+
+/* Basic function to insert character into vty. */
+static void vty_self_insert(struct vty *vty, char c)
+{
+	int i;
+	int length;
+
+	vty_ensure(vty, vty->length + 1);
+	length = vty->length - vty->cp;
+	memmove(&vty->buf[vty->cp + 1], &vty->buf[vty->cp], length);
+	vty->buf[vty->cp] = c;
+
+	vty_write(vty, &vty->buf[vty->cp], length + 1);
+	for (i = 0; i < length; i++)
+		vty_write(vty, &telnet_backward_char, 1);
+
+	vty->cp++;
+	vty->length++;
+}
+
+/* Self insert character 'c' in overwrite mode. */
+static void vty_self_insert_overwrite(struct vty *vty, char c)
+{
+	vty_ensure(vty, vty->length + 1);
+	vty->buf[vty->cp++] = c;
+
+	if (vty->cp > vty->length)
+		vty->length++;
+
+	if ((vty->node == AUTH_NODE) || (vty->node == AUTH_ENABLE_NODE))
+		return;
+
+	vty_write(vty, &c, 1);
+}
+
+/* Insert a word into vty interface with overwrite mode. */
+static void vty_insert_word_overwrite(struct vty *vty, char *str)
+{
+	int len = strlen(str);
+	vty_write(vty, str, len);
+	strcpy(&vty->buf[vty->cp], str);
+	vty->cp += len;
+	vty->length = vty->cp;
+}
+
+/* Forward character. */
+static void vty_forward_char(struct vty *vty)
+{
+	if (vty->cp < vty->length) {
+		vty_write(vty, &vty->buf[vty->cp], 1);
+		vty->cp++;
+	}
+}
+
+/* Backward character. */
+static void vty_backward_char(struct vty *vty)
+{
+	if (vty->cp > 0) {
+		vty->cp--;
+		vty_write(vty, &telnet_backward_char, 1);
+	}
+}
+
+/* Move to the beginning of the line. */
+static void vty_beginning_of_line(struct vty *vty)
+{
+	while (vty->cp)
+		vty_backward_char(vty);
+}
+
+/* Move to the end of the line. */
+static void vty_end_of_line(struct vty *vty)
+{
+	while (vty->cp < vty->length)
+		vty_forward_char(vty);
+}
+
+/* Add current command line to the history buffer. */
+static void vty_hist_add(struct vty *vty)
+{
+	int index;
+
+	if (vty->length == 0)
+		return;
+
+	index = vty->hindex ? vty->hindex - 1 : VTY_MAXHIST - 1;
+
+	/* Ignore the same string as previous one. */
+	if (vty->hist[index])
+		if (strcmp(vty->buf, vty->hist[index]) == 0) {
+			vty->hp = vty->hindex;
+			return;
+		}
+
+	/* Insert history entry. */
+	if (vty->hist[vty->hindex])
+		free(vty->hist[vty->hindex]);
+	vty->hist[vty->hindex] = strdup(vty->buf);
+
+	/* History index rotation. */
+	vty->hindex++;
+	if (vty->hindex == VTY_MAXHIST)
+		vty->hindex = 0;
+
+	vty->hp = vty->hindex;
+}
+
+/* Get telnet window size. */
+static int
+vty_telnet_option (struct vty *vty, unsigned char *buf, int nbytes)
+{
+#ifdef TELNET_OPTION_DEBUG
+  int i;
+
+  for (i = 0; i < nbytes; i++)
+    {
+      switch (buf[i])
+	{
+	case IAC:
+	  vty_out (vty, "IAC ");
+	  break;
+	case WILL:
+	  vty_out (vty, "WILL ");
+	  break;
+	case WONT:
+	  vty_out (vty, "WONT ");
+	  break;
+	case DO:
+	  vty_out (vty, "DO ");
+	  break;
+	case DONT:
+	  vty_out (vty, "DONT ");
+	  break;
+	case SB:
+	  vty_out (vty, "SB ");
+	  break;
+	case SE:
+	  vty_out (vty, "SE ");
+	  break;
+	case TELOPT_ECHO:
+	  vty_out (vty, "TELOPT_ECHO %s", VTY_NEWLINE);
+	  break;
+	case TELOPT_SGA:
+	  vty_out (vty, "TELOPT_SGA %s", VTY_NEWLINE);
+	  break;
+	case TELOPT_NAWS:
+	  vty_out (vty, "TELOPT_NAWS %s", VTY_NEWLINE);
+	  break;
+	default:
+	  vty_out (vty, "%x ", buf[i]);
+	  break;
+	}
+    }
+  vty_out (vty, "%s", VTY_NEWLINE);
+
+#endif /* TELNET_OPTION_DEBUG */
+
+  switch (buf[0])
+    {
+    case SB:
+      vty->sb_len = 0;
+      vty->iac_sb_in_progress = 1;
+      return 0;
+      break;
+    case SE: 
+      {
+	if (!vty->iac_sb_in_progress)
+	  return 0;
+
+	if ((vty->sb_len == 0) || (vty->sb_buf[0] == '\0'))
+	  {
+	    vty->iac_sb_in_progress = 0;
+	    return 0;
+	  }
+	switch (vty->sb_buf[0])
+	  {
+	  case TELOPT_NAWS:
+	    if (vty->sb_len != TELNET_NAWS_SB_LEN)
+	      vty_out(vty,"RFC 1073 violation detected: telnet NAWS option "
+			"should send %d characters, but we received %lu",
+			TELNET_NAWS_SB_LEN, (u_long)vty->sb_len);
+	    else if (sizeof(vty->sb_buf) < TELNET_NAWS_SB_LEN)
+	      vty_out(vty, "Bug detected: sizeof(vty->sb_buf) %lu < %d, "
+		       "too small to handle the telnet NAWS option",
+		       (u_long)sizeof(vty->sb_buf), TELNET_NAWS_SB_LEN);
+	    else
+	      {
+		vty->width = ((vty->sb_buf[1] << 8)|vty->sb_buf[2]);
+		vty->height = ((vty->sb_buf[3] << 8)|vty->sb_buf[4]);
+#ifdef TELNET_OPTION_DEBUG
+		vty_out(vty, "TELNET NAWS window size negotiation completed: "
+			      "width %d, height %d%s",
+			vty->width, vty->height, VTY_NEWLINE);
+#endif
+	      }
+	    break;
+	  }
+	vty->iac_sb_in_progress = 0;
+	return 0;
+	break;
+      }
+    default:
+      break;
+    }
+  return 1;
+}
+
+/* Execute current command line. */
+static int vty_execute(struct vty *vty)
+{
+	int ret;
+
+	ret = CMD_SUCCESS;
+
+	switch (vty->node) {
+	case AUTH_NODE:
+	case AUTH_ENABLE_NODE:
+		vty_auth(vty, vty->buf);
+		break;
+	default:
+		ret = vty_command(vty, vty->buf);
+		if (vty->type == VTY_TERM)
+			vty_hist_add(vty);
+		break;
+	}
+
+	/* Clear command line buffer. */
+	vty->cp = vty->length = 0;
+	vty_clear_buf(vty);
+
+	if (vty->status != VTY_CLOSE)
+		vty_prompt(vty);
+
+	return ret;
+}
+
+/* Send WILL TELOPT_ECHO to remote server. */
+static void
+vty_will_echo (struct vty *vty)
+{
+	unsigned char cmd[] = { IAC, WILL, TELOPT_ECHO, '\0' };
+	vty_out (vty, "%s", cmd);
+}
+
+/* Make suppress Go-Ahead telnet option. */
+static void
+vty_will_suppress_go_ahead (struct vty *vty)
+{
+	unsigned char cmd[] = { IAC, WILL, TELOPT_SGA, '\0' };
+	vty_out (vty, "%s", cmd);
+}
+
+/* Make don't use linemode over telnet. */
+static void
+vty_dont_linemode (struct vty *vty)
+{
+	unsigned char cmd[] = { IAC, DONT, TELOPT_LINEMODE, '\0' };
+	vty_out (vty, "%s", cmd);
+}
+
+/* Use window size. */
+static void
+vty_do_window_size (struct vty *vty)
+{
+	unsigned char cmd[] = { IAC, DO, TELOPT_NAWS, '\0' };
+	vty_out (vty, "%s", cmd);
+}
+
+static void vty_kill_line_from_beginning(struct vty *);
+static void vty_redraw_line(struct vty *);
+
+/* Print command line history.  This function is called from
+   vty_next_line and vty_previous_line. */
+static void vty_history_print(struct vty *vty)
+{
+	int length;
+
+	vty_kill_line_from_beginning(vty);
+
+	/* Get previous line from history buffer */
+	length = strlen(vty->hist[vty->hp]);
+	memcpy(vty->buf, vty->hist[vty->hp], length);
+	vty->cp = vty->length = length;
+
+	/* Redraw current line */
+	vty_redraw_line(vty);
+}
+
+/* Show next command line history. */
+static void vty_next_line(struct vty *vty)
+{
+	int try_index;
+
+	if (vty->hp == vty->hindex)
+		return;
+
+	/* Try is there history exist or not. */
+	try_index = vty->hp;
+	if (try_index == (VTY_MAXHIST - 1))
+		try_index = 0;
+	else
+		try_index++;
+
+	/* If there is not history return. */
+	if (vty->hist[try_index] == NULL)
+		return;
+	else
+		vty->hp = try_index;
+
+	vty_history_print(vty);
+}
+
+/* Show previous command line history. */
+static void vty_previous_line(struct vty *vty)
+{
+	int try_index;
+
+	try_index = vty->hp;
+	if (try_index == 0)
+		try_index = VTY_MAXHIST - 1;
+	else
+		try_index--;
+
+	if (vty->hist[try_index] == NULL)
+		return;
+	else
+		vty->hp = try_index;
+
+	vty_history_print(vty);
+}
+
+/* This function redraw all of the command line character. */
+static void vty_redraw_line(struct vty *vty)
+{
+	vty_write(vty, vty->buf, vty->length);
+	vty->cp = vty->length;
+}
+
+/* Forward word. */
+static void vty_forward_word(struct vty *vty)
+{
+	while (vty->cp != vty->length && vty->buf[vty->cp] != ' ')
+		vty_forward_char(vty);
+
+	while (vty->cp != vty->length && vty->buf[vty->cp] == ' ')
+		vty_forward_char(vty);
+}
+
+/* Backward word without skipping training space. */
+static void vty_backward_pure_word(struct vty *vty)
+{
+	while (vty->cp > 0 && vty->buf[vty->cp - 1] != ' ')
+		vty_backward_char(vty);
+}
+
+/* Backward word. */
+static void vty_backward_word(struct vty *vty)
+{
+	while (vty->cp > 0 && vty->buf[vty->cp - 1] == ' ')
+		vty_backward_char(vty);
+
+	while (vty->cp > 0 && vty->buf[vty->cp - 1] != ' ')
+		vty_backward_char(vty);
+}
+
+/* When '^D' is typed at the beginning of the line we move to the down
+   level. */
+static void vty_down_level(struct vty *vty)
+{
+	vty_out(vty, "%s", VTY_NEWLINE);
+	(*config_exit_cmd.func) (NULL, vty, 0, NULL);
+	vty_prompt(vty);
+	vty->cp = 0;
+}
+
+/* When '^Z' is received from vty, move down to the enable mode. */
+static void vty_end_config(struct vty *vty)
+{
+	vty_out(vty, "%s", VTY_NEWLINE);
+
+	switch (vty->node) {
+	case VIEW_NODE:
+	case ENABLE_NODE:
+		/* Nothing to do. */
+		break;
+	case CONFIG_NODE:
+	case INTERFACE_NODE:
+	case ZEBRA_NODE:
+	case RIP_NODE:
+	case RIPNG_NODE:
+	case BGP_NODE:
+	case BGP_VPNV4_NODE:
+	case BGP_IPV4_NODE:
+	case BGP_IPV4M_NODE:
+	case BGP_IPV6_NODE:
+	case RMAP_NODE:
+	case OSPF_NODE:
+	case OSPF6_NODE:
+	case ISIS_NODE:
+	case KEYCHAIN_NODE:
+	case KEYCHAIN_KEY_NODE:
+	case MASC_NODE:
+	case VTY_NODE:
+		vty_config_unlock(vty);
+		vty->node = ENABLE_NODE;
+		break;
+	default:
+		/* Unknown node, we have to ignore it. */
+		break;
+	}
+
+	vty_prompt(vty);
+	vty->cp = 0;
+}
+
+/* Delete a charcter at the current point. */
+static void vty_delete_char(struct vty *vty)
+{
+	int i;
+	int size;
+
+	if (vty->node == AUTH_NODE || vty->node == AUTH_ENABLE_NODE)
+		return;
+
+	if (vty->length == 0) {
+		vty_down_level(vty);
+		return;
+	}
+
+	if (vty->cp == vty->length)
+		return;		/* completion need here? */
+
+	size = vty->length - vty->cp;
+
+	vty->length--;
+	memmove(&vty->buf[vty->cp], &vty->buf[vty->cp + 1], size - 1);
+	vty->buf[vty->length] = '\0';
+
+	vty_write(vty, &vty->buf[vty->cp], size - 1);
+	vty_write(vty, &telnet_space_char, 1);
+
+	for (i = 0; i < size; i++)
+		vty_write(vty, &telnet_backward_char, 1);
+}
+
+/* Delete a character before the point. */
+static void vty_delete_backward_char(struct vty *vty)
+{
+	if (vty->cp == 0)
+		return;
+
+	vty_backward_char(vty);
+	vty_delete_char(vty);
+}
+
+/* Kill rest of line from current point. */
+static void vty_kill_line(struct vty *vty)
+{
+	int i;
+	int size;
+
+	size = vty->length - vty->cp;
+
+	if (size == 0)
+		return;
+
+	for (i = 0; i < size; i++)
+		vty_write(vty, &telnet_space_char, 1);
+	for (i = 0; i < size; i++)
+		vty_write(vty, &telnet_backward_char, 1);
+
+	memset(&vty->buf[vty->cp], 0, size);
+	vty->length = vty->cp;
+}
+
+/* Kill line from the beginning. */
+static void vty_kill_line_from_beginning(struct vty *vty)
+{
+	vty_beginning_of_line(vty);
+	vty_kill_line(vty);
+}
+
+/* Delete a word before the point. */
+static void vty_forward_kill_word(struct vty *vty)
+{
+	while (vty->cp != vty->length && vty->buf[vty->cp] == ' ')
+		vty_delete_char(vty);
+	while (vty->cp != vty->length && vty->buf[vty->cp] != ' ')
+		vty_delete_char(vty);
+}
+
+/* Delete a word before the point. */
+static void vty_backward_kill_word(struct vty *vty)
+{
+	while (vty->cp > 0 && vty->buf[vty->cp - 1] == ' ')
+		vty_delete_backward_char(vty);
+	while (vty->cp > 0 && vty->buf[vty->cp - 1] != ' ')
+		vty_delete_backward_char(vty);
+}
+
+/* Transpose chars before or at the point. */
+static void vty_transpose_chars(struct vty *vty)
+{
+	char c1, c2;
+
+	/* If length is short or point is near by the beginning of line then
+	   return. */
+	if (vty->length < 2 || vty->cp < 1)
+		return;
+
+	/* In case of point is located at the end of the line. */
+	if (vty->cp == vty->length) {
+		c1 = vty->buf[vty->cp - 1];
+		c2 = vty->buf[vty->cp - 2];
+
+		vty_backward_char(vty);
+		vty_backward_char(vty);
+		vty_self_insert_overwrite(vty, c1);
+		vty_self_insert_overwrite(vty, c2);
+	} else {
+		c1 = vty->buf[vty->cp];
+		c2 = vty->buf[vty->cp - 1];
+
+		vty_backward_char(vty);
+		vty_self_insert_overwrite(vty, c1);
+		vty_self_insert_overwrite(vty, c2);
+	}
+}
+
+/* Do completion at vty interface. */
+static void vty_complete_command(struct vty *vty)
+{
+	int i;
+	int ret;
+	char **matched = NULL;
+	vector vline;
+
+	if (vty->node == AUTH_NODE || vty->node == AUTH_ENABLE_NODE)
+		return;
+
+	vline = cmd_make_strvec(vty->buf);
+	if (vline == NULL)
+		return;
+
+	/* In case of 'help \t'. */
+	if (isspace((int)vty->buf[vty->length - 1]))
+		vector_set(vline, '\0');
+
+	matched = cmd_complete_command(vline, vty, &ret);
+
+	cmd_free_strvec(vline);
+
+	vty_out(vty, "%s", VTY_NEWLINE);
+	switch (ret) {
+	case CMD_ERR_AMBIGUOUS:
+		vty_out(vty, "%% Ambiguous command.%s", VTY_NEWLINE);
+		vty_prompt(vty);
+		vty_redraw_line(vty);
+		break;
+	case CMD_ERR_NO_MATCH:
+		/* vty_out (vty, "%% There is no matched command.%s", VTY_NEWLINE); */
+		vty_prompt(vty);
+		vty_redraw_line(vty);
+		break;
+	case CMD_COMPLETE_FULL_MATCH:
+		vty_prompt(vty);
+		vty_redraw_line(vty);
+		vty_backward_pure_word(vty);
+		vty_insert_word_overwrite(vty, matched[0]);
+		vty_self_insert(vty, ' ');
+		free(matched[0]);
+		break;
+	case CMD_COMPLETE_MATCH:
+		vty_prompt(vty);
+		vty_redraw_line(vty);
+		vty_backward_pure_word(vty);
+		vty_insert_word_overwrite(vty, matched[0]);
+		free(matched[0]);
+		vector_only_index_free(matched);
+		return;
+		break;
+	case CMD_COMPLETE_LIST_MATCH:
+		for (i = 0; matched[i] != NULL; i++) {
+			if (i != 0 && ((i % 6) == 0))
+				vty_out(vty, "%s", VTY_NEWLINE);
+			vty_out(vty, "%-10s ", matched[i]);
+			free(matched[i]);
+		}
+		vty_out(vty, "%s", VTY_NEWLINE);
+
+		vty_prompt(vty);
+		vty_redraw_line(vty);
+		break;
+	case CMD_ERR_NOTHING_TODO:
+		vty_prompt(vty);
+		vty_redraw_line(vty);
+		break;
+	default:
+		break;
+	}
+	if (matched)
+		vector_only_index_free(matched);
+}
+
+static void
+vty_describe_fold(struct vty *vty, int cmd_width,
+		  unsigned int desc_width, struct desc *desc)
+{
+	char *buf;
+	const char *cmd, *p;
+	int pos;
+
+	cmd = desc->cmd[0] == '.' ? desc->cmd + 1 : desc->cmd;
+
+	if (desc_width <= 0) {
+		vty_out(vty, "  %-*s  %s%s", cmd_width, cmd, desc->str,
+			VTY_NEWLINE);
+		return;
+	}
+
+	buf = calloc(1, strlen(desc->str) + 1);
+	if (!buf)
+		return;
+
+	for (p = desc->str; strlen(p) > desc_width; p += pos + 1) {
+		for (pos = desc_width; pos > 0; pos--)
+			if (*(p + pos) == ' ')
+				break;
+
+		if (pos == 0)
+			break;
+
+		strncpy(buf, p, pos);
+		buf[pos] = '\0';
+		vty_out(vty, "  %-*s  %s%s", cmd_width, cmd, buf, VTY_NEWLINE);
+
+		cmd = "";
+	}
+
+	vty_out(vty, "  %-*s  %s%s", cmd_width, cmd, p, VTY_NEWLINE);
+
+	free(buf);
+}
+
+/* Describe matched command function. */
+static void vty_describe_command(struct vty *vty)
+{
+	int ret;
+	vector vline;
+	vector describe;
+	unsigned int i, width, desc_width;
+	struct desc *desc, *desc_cr = NULL;
+
+	vline = cmd_make_strvec(vty->buf);
+
+	/* In case of '> ?'. */
+	if (vline == NULL) {
+		vline = vector_init(1);
+		vector_set(vline, '\0');
+	} else if (isspace((int)vty->buf[vty->length - 1]))
+		vector_set(vline, '\0');
+
+	describe = cmd_describe_command(vline, vty, &ret);
+
+	vty_out(vty, "%s", VTY_NEWLINE);
+
+	/* Ambiguous error. */
+	switch (ret) {
+	case CMD_ERR_AMBIGUOUS:
+		cmd_free_strvec(vline);
+		vty_out(vty, "%% Ambiguous command.%s", VTY_NEWLINE);
+		vty_prompt(vty);
+		vty_redraw_line(vty);
+		return;
+		break;
+	case CMD_ERR_NO_MATCH:
+		cmd_free_strvec(vline);
+		vty_out(vty, "%% There is no matched command.%s", VTY_NEWLINE);
+		vty_prompt(vty);
+		vty_redraw_line(vty);
+		return;
+		break;
+	}
+
+	/* Get width of command string. */
+	width = 0;
+	for (i = 0; i < vector_active(describe); i++)
+		if ((desc = vector_slot(describe, i)) != NULL) {
+			unsigned int len;
+
+			if (desc->cmd[0] == '\0')
+				continue;
+
+			len = strlen(desc->cmd);
+			if (desc->cmd[0] == '.')
+				len--;
+
+			if (width < len)
+				width = len;
+		}
+
+	/* Get width of description string. */
+	desc_width = vty->width - (width + 6);
+
+	/* Print out description. */
+	for (i = 0; i < vector_active(describe); i++)
+		if ((desc = vector_slot(describe, i)) != NULL) {
+			if (desc->cmd[0] == '\0')
+				continue;
+
+			if (strcmp(desc->cmd, "<cr>") == 0) {
+				desc_cr = desc;
+				continue;
+			}
+
+			if (!desc->str)
+				vty_out(vty, "  %-s%s",
+					desc->cmd[0] ==
+					'.' ? desc->cmd + 1 : desc->cmd,
+					VTY_NEWLINE);
+			else if (desc_width >= strlen(desc->str))
+				vty_out(vty, "  %-*s  %s%s", width,
+					desc->cmd[0] ==
+					'.' ? desc->cmd + 1 : desc->cmd,
+					desc->str, VTY_NEWLINE);
+			else
+				vty_describe_fold(vty, width, desc_width, desc);
+
+#if 0
+			vty_out(vty, "  %-*s %s%s", width
+				desc->cmd[0] == '.' ? desc->cmd + 1 : desc->cmd,
+				desc->str ? desc->str : "", VTY_NEWLINE);
+#endif				/* 0 */
+		}
+
+	if ((desc = desc_cr)) {
+		if (!desc->str)
+			vty_out(vty, "  %-s%s",
+				desc->cmd[0] == '.' ? desc->cmd + 1 : desc->cmd,
+				VTY_NEWLINE);
+		else if (desc_width >= strlen(desc->str))
+			vty_out(vty, "  %-*s  %s%s", width,
+				desc->cmd[0] == '.' ? desc->cmd + 1 : desc->cmd,
+				desc->str, VTY_NEWLINE);
+		else
+			vty_describe_fold(vty, width, desc_width, desc);
+	}
+
+	cmd_free_strvec(vline);
+	vector_free(describe);
+
+	vty_prompt(vty);
+	vty_redraw_line(vty);
+}
+
+/* ^C stop current input and do not add command line to the history. */
+static void vty_stop_input(struct vty *vty)
+{
+	vty->cp = vty->length = 0;
+	vty_clear_buf(vty);
+	vty_out(vty, "%s", VTY_NEWLINE);
+
+	switch (vty->node) {
+	case VIEW_NODE:
+	case ENABLE_NODE:
+		/* Nothing to do. */
+		break;
+	case CONFIG_NODE:
+	case INTERFACE_NODE:
+	case ZEBRA_NODE:
+	case RIP_NODE:
+	case RIPNG_NODE:
+	case BGP_NODE:
+	case RMAP_NODE:
+	case OSPF_NODE:
+	case OSPF6_NODE:
+	case ISIS_NODE:
+	case KEYCHAIN_NODE:
+	case KEYCHAIN_KEY_NODE:
+	case MASC_NODE:
+	case VTY_NODE:
+		vty_config_unlock(vty);
+		vty->node = ENABLE_NODE;
+		break;
+	default:
+		/* Unknown node, we have to ignore it. */
+		break;
+	}
+	vty_prompt(vty);
+
+	/* Set history pointer to the latest one. */
+	vty->hp = vty->hindex;
+}
+
+#define CONTROL(X)  ((X) - '@')
+#define VTY_NORMAL     0
+#define VTY_PRE_ESCAPE 1
+#define VTY_ESCAPE     2
+
+/* Escape character command map. */
+static void vty_escape_map(unsigned char c, struct vty *vty)
+{
+	switch (c) {
+	case ('A'):
+		vty_previous_line(vty);
+		break;
+	case ('B'):
+		vty_next_line(vty);
+		break;
+	case ('C'):
+		vty_forward_char(vty);
+		break;
+	case ('D'):
+		vty_backward_char(vty);
+		break;
+	default:
+		break;
+	}
+
+	/* Go back to normal mode. */
+	vty->escape = VTY_NORMAL;
+}
+
+/* Quit print out to the buffer. */
+static void vty_buffer_reset(struct vty *vty)
+{
+	buffer_reset(vty->obuf);
+	vty_prompt(vty);
+	vty_redraw_line(vty);
+}
+
+/* Read data via vty socket. */
+int vty_read(struct vty *vty)
+{
+	int i;
+	int nbytes;
+	unsigned char buf[VTY_READ_BUFSIZ];
+
+	int vty_sock = vty->fd;
+
+	/* Read raw data from socket */
+	if ((nbytes = read(vty->fd, buf, VTY_READ_BUFSIZ)) <= 0) {
+		if (nbytes < 0) {
+			if (ERRNO_IO_RETRY(errno)) {
+				vty_event(VTY_READ, vty_sock, vty);
+				return 0;
+			}
+		}
+		buffer_reset(vty->obuf);
+		vty->status = VTY_CLOSE;
+	}
+
+	for (i = 0; i < nbytes; i++) {
+		if (buf[i] == IAC) {
+			if (!vty->iac) {
+				vty->iac = 1;
+				continue;
+			} else {
+				vty->iac = 0;
+			}
+		}
+
+		if (vty->iac_sb_in_progress && !vty->iac) {
+			if (vty->sb_len < sizeof(vty->sb_buf))
+				vty->sb_buf[vty->sb_len] = buf[i];
+			vty->sb_len++;
+			continue;
+		}
+
+		if (vty->iac) {
+			/* In case of telnet command */
+			int ret = 0;
+			ret = vty_telnet_option(vty, buf + i, nbytes - i);
+			vty->iac = 0;
+			i += ret;
+			continue;
+		}
+
+		if (vty->status == VTY_MORE) {
+			switch (buf[i]) {
+			case CONTROL('C'):
+			case 'q':
+			case 'Q':
+				vty_buffer_reset(vty);
+				break;
+#if 0				/* More line does not work for "show ip bgp".  */
+			case '\n':
+			case '\r':
+				vty->status = VTY_MORELINE;
+				break;
+#endif
+			default:
+				break;
+			}
+			continue;
+		}
+
+		/* Escape character. */
+		if (vty->escape == VTY_ESCAPE) {
+			vty_escape_map(buf[i], vty);
+			continue;
+		}
+
+		/* Pre-escape status. */
+		if (vty->escape == VTY_PRE_ESCAPE) {
+			switch (buf[i]) {
+			case '[':
+				vty->escape = VTY_ESCAPE;
+				break;
+			case 'b':
+				vty_backward_word(vty);
+				vty->escape = VTY_NORMAL;
+				break;
+			case 'f':
+				vty_forward_word(vty);
+				vty->escape = VTY_NORMAL;
+				break;
+			case 'd':
+				vty_forward_kill_word(vty);
+				vty->escape = VTY_NORMAL;
+				break;
+			case CONTROL('H'):
+			case 0x7f:
+				vty_backward_kill_word(vty);
+				vty->escape = VTY_NORMAL;
+				break;
+			default:
+				vty->escape = VTY_NORMAL;
+				break;
+			}
+			continue;
+		}
+
+		switch (buf[i]) {
+		case CONTROL('A'):
+			vty_beginning_of_line(vty);
+			break;
+		case CONTROL('B'):
+			vty_backward_char(vty);
+			break;
+		case CONTROL('C'):
+			vty_stop_input(vty);
+			break;
+		case CONTROL('D'):
+			vty_delete_char(vty);
+			break;
+		case CONTROL('E'):
+			vty_end_of_line(vty);
+			break;
+		case CONTROL('F'):
+			vty_forward_char(vty);
+			break;
+		case CONTROL('H'):
+		case 0x7f:
+			vty_delete_backward_char(vty);
+			break;
+		case CONTROL('K'):
+			vty_kill_line(vty);
+			break;
+		case CONTROL('N'):
+			vty_next_line(vty);
+			break;
+		case CONTROL('P'):
+			vty_previous_line(vty);
+			break;
+		case CONTROL('T'):
+			vty_transpose_chars(vty);
+			break;
+		case CONTROL('U'):
+			vty_kill_line_from_beginning(vty);
+			break;
+		case CONTROL('W'):
+			vty_backward_kill_word(vty);
+			break;
+		case CONTROL('Z'):
+			vty_end_config(vty);
+			break;
+		case '\n':
+		case '\r':
+			vty_out(vty, "%s", VTY_NEWLINE);
+			vty_execute(vty);
+			break;
+		case '\t':
+			vty_complete_command(vty);
+			break;
+		case '?':
+			if (vty->node == AUTH_NODE
+			    || vty->node == AUTH_ENABLE_NODE)
+				vty_self_insert(vty, buf[i]);
+			else
+				vty_describe_command(vty);
+			break;
+		case '\033':
+			if (i + 1 < nbytes && buf[i + 1] == '[') {
+				vty->escape = VTY_ESCAPE;
+				i++;
+			} else
+				vty->escape = VTY_PRE_ESCAPE;
+			break;
+		default:
+			if (buf[i] > 31 && buf[i] < 127)
+				vty_self_insert(vty, buf[i]);
+			break;
+		}
+	}
+
+	/* Check status. */
+	if (vty->status == VTY_CLOSE)
+		vty_close(vty);
+	else {
+		vty_event(VTY_WRITE, vty_sock, vty);
+		vty_event(VTY_READ, vty_sock, vty);
+	}
+	return 0;
+}
+
+/* Create new vty structure. */
+struct vty *
+vty_create (int vty_sock)
+{
+  struct vty *vty;
+
+	struct termios t;
+
+	tcgetattr(vty_sock, &t);
+	cfmakeraw(&t);
+	tcsetattr(vty_sock, TCSANOW, &t);
+
+  /* Allocate new vty structure and set up default values. */
+  vty = vty_new ();
+  vty->fd = vty_sock;
+  vty->type = VTY_TERM;
+  if (no_password_check)
+    {
+      if (host.advanced)
+	vty->node = ENABLE_NODE;
+      else
+	vty->node = VIEW_NODE;
+    }
+  else
+    vty->node = AUTH_NODE;
+  vty->fail = 0;
+  vty->cp = 0;
+  vty_clear_buf (vty);
+  vty->length = 0;
+  memset (vty->hist, 0, sizeof (vty->hist));
+  vty->hp = 0;
+  vty->hindex = 0;
+  vector_set_index (vtyvec, vty_sock, vty);
+  vty->status = VTY_NORMAL;
+  if (host.lines >= 0)
+    vty->lines = host.lines;
+  else
+    vty->lines = -1;
+
+  if (! no_password_check)
+    {
+      /* Vty is not available if password isn't set. */
+      if (host.password == NULL && host.password_encrypt == NULL)
+	{
+	  vty_out (vty, "Vty password is not set.%s", VTY_NEWLINE);
+	  vty->status = VTY_CLOSE;
+	  vty_close (vty);
+	  return NULL;
+	}
+    }
+
+  /* Say hello to the world. */
+  vty_hello (vty);
+  if (! no_password_check)
+    vty_out (vty, "%sUser Access Verification%s%s", VTY_NEWLINE, VTY_NEWLINE, VTY_NEWLINE);
+
+  /* Setting up terminal. */
+  vty_will_echo (vty);
+  vty_will_suppress_go_ahead (vty);
+
+  vty_dont_linemode (vty);
+  vty_do_window_size (vty);
+  /* vty_dont_lflow_ahead (vty); */
+
+  vty_prompt (vty);
+
+  /* Add read/write thread. */
+  vty_event (VTY_WRITE, vty_sock, vty);
+  vty_event (VTY_READ, vty_sock, vty);
+
+  return vty;
+}
+
+DEFUN(config_who, config_who_cmd, "who", "Display who is on vty\n")
+{
+	unsigned int i;
+	struct vty *v;
+
+	for (i = 0; i < vector_active(vtyvec); i++)
+		if ((v = vector_slot(vtyvec, i)) != NULL)
+			vty_out(vty, "%svty[%d] %s",
+				v->config ? "*" : " ", i, VTY_NEWLINE);
+	return CMD_SUCCESS;
+}
+
+/* Move to vty configuration mode. */
+DEFUN(line_vty,
+      line_vty_cmd,
+      "line vty", "Configure a terminal line\n" "Virtual terminal\n")
+{
+	vty->node = VTY_NODE;
+	return CMD_SUCCESS;
+}
+
+/* vty login. */
+DEFUN(vty_login, vty_login_cmd, "login", "Enable password checking\n")
+{
+	no_password_check = 0;
+	return CMD_SUCCESS;
+}
+
+DEFUN(no_vty_login,
+      no_vty_login_cmd, "no login", NO_STR "Enable password checking\n")
+{
+	no_password_check = 1;
+	return CMD_SUCCESS;
+}
+
+DEFUN(service_advanced_vty,
+      service_advanced_vty_cmd,
+      "service advanced-vty",
+      "Set up miscellaneous service\n" "Enable advanced mode vty interface\n")
+{
+	host.advanced = 1;
+	return CMD_SUCCESS;
+}
+
+DEFUN(no_service_advanced_vty,
+      no_service_advanced_vty_cmd,
+      "no service advanced-vty",
+      NO_STR
+      "Set up miscellaneous service\n" "Enable advanced mode vty interface\n")
+{
+	host.advanced = 0;
+	return CMD_SUCCESS;
+}
+
+DEFUN(terminal_monitor,
+      terminal_monitor_cmd,
+      "terminal monitor",
+      "Set terminal line parameters\n"
+      "Copy debug output to the current terminal line\n")
+{
+	vty->monitor = 1;
+	return CMD_SUCCESS;
+}
+
+DEFUN(terminal_no_monitor,
+      terminal_no_monitor_cmd,
+      "terminal no monitor",
+      "Set terminal line parameters\n"
+      NO_STR "Copy debug output to the current terminal line\n")
+{
+	vty->monitor = 0;
+	return CMD_SUCCESS;
+}
+
+DEFUN(show_history,
+      show_history_cmd,
+      "show history", SHOW_STR "Display the session command history\n")
+{
+	int index;
+
+	for (index = vty->hindex + 1; index != vty->hindex;) {
+		if (index == VTY_MAXHIST) {
+			index = 0;
+			continue;
+		}
+
+		if (vty->hist[index] != NULL)
+			vty_out(vty, "  %s%s", vty->hist[index], VTY_NEWLINE);
+
+		index++;
+	}
+
+	return CMD_SUCCESS;
+}
+
+/* Display current configuration. */
+static int vty_config_write(struct vty *vty)
+{
+	vty_out(vty, "line vty%s", VTY_NEWLINE);
+
+	/* login */
+	if (no_password_check)
+		vty_out(vty, " no login%s", VTY_NEWLINE);
+
+	vty_out(vty, "!%s", VTY_NEWLINE);
+
+	return CMD_SUCCESS;
+}
+
+struct cmd_node vty_node = {
+	VTY_NODE,
+	"%s(config-line)# ",
+	1,
+};
+
+/* Reset all VTY status. */
+void vty_reset()
+{
+	unsigned int i;
+	struct vty *vty;
+	struct thread *vty_serv_thread;
+
+	for (i = 0; i < vector_active(vtyvec); i++)
+		if ((vty = vector_slot(vtyvec, i)) != NULL) {
+			buffer_reset(vty->obuf);
+			vty->status = VTY_CLOSE;
+			vty_close(vty);
+		}
+
+	for (i = 0; i < vector_active(Vvty_serv_thread); i++)
+		if ((vty_serv_thread =
+		     vector_slot(Vvty_serv_thread, i)) != NULL) {
+			//thread_cancel (vty_serv_thread);
+			vector_slot(Vvty_serv_thread, i) = NULL;
+			close(i);
+		}
+}
+
+static void vty_save_cwd(void)
+{
+	char cwd[MAXPATHLEN];
+	char *c;
+
+	c = getcwd(cwd, MAXPATHLEN);
+
+	if (!c) {
+		chdir(SYSCONFDIR);
+		getcwd(cwd, MAXPATHLEN);
+	}
+
+	vty_cwd = malloc(strlen(cwd) + 1);
+	strcpy(vty_cwd, cwd);
+}
+
+char *vty_get_cwd()
+{
+	return vty_cwd;
+}
+
+int vty_shell_serv(struct vty *vty)
+{
+	return vty->type == VTY_SHELL_SERV ? 1 : 0;
+}
+
+void vty_init_vtysh()
+{
+	vtyvec = vector_init(VECTOR_MIN_SIZE);
+}
+
+/* Install vty's own commands like `who' command. */
+void vty_init()
+{
+	/* For further configuration read, preserve current directory. */
+	vty_save_cwd();
+
+	vtyvec = vector_init(VECTOR_MIN_SIZE);
+
+	/* Install bgp top node. */
+	install_node(&vty_node, vty_config_write);
+
+	install_element(VIEW_NODE, &config_who_cmd);
+	install_element(VIEW_NODE, &show_history_cmd);
+	install_element(ENABLE_NODE, &config_who_cmd);
+	install_element(CONFIG_NODE, &line_vty_cmd);
+	install_element(CONFIG_NODE, &service_advanced_vty_cmd);
+	install_element(CONFIG_NODE, &no_service_advanced_vty_cmd);
+	install_element(CONFIG_NODE, &show_history_cmd);
+	install_element(ENABLE_NODE, &terminal_monitor_cmd);
+	install_element(ENABLE_NODE, &terminal_no_monitor_cmd);
+	install_element(ENABLE_NODE, &show_history_cmd);
+
+	install_default(VTY_NODE);
+#if 0
+	install_element(VTY_NODE, &vty_login_cmd);
+	install_element(VTY_NODE, &no_vty_login_cmd);
+#endif
+}