[mirror_frr.git] / vtysh / vtysh.c

/* Virtual terminal interface shell.
 * Copyright (C) 2000 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 this program; see the file COPYING; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <zebra.h>

#include <sys/un.h>
#include <setjmp.h>
#include <sys/wait.h>
#include <sys/resource.h>
#include <sys/stat.h>

#include <readline/readline.h>
#include <readline/history.h>

#include <dirent.h>
#include <stdio.h>
#include <string.h>

#include "linklist.h"
#include "command.h"
#include "memory.h"
#include "filter.h"
#include "vtysh/vtysh.h"
#include "log.h"
#include "bgpd/bgp_vty.h"
#include "ns.h"
#include "vrf.h"
#include "libfrr.h"
#include "command_graph.h"
#include "frrstr.h"
#include "json.h"
#include "ferr.h"

DEFINE_MTYPE_STATIC(MVTYSH, VTYSH_CMD, "Vtysh cmd copy")

/* Struct VTY. */
struct vty *vty;

/* VTY shell pager name. */
char *vtysh_pager_name = NULL;

/* VTY shell client structure */
struct vtysh_client {
        int fd;
        const char *name;
        int flag;
        char path[MAXPATHLEN];
        struct vtysh_client *next;
};

/* Some utility functions for working on vtysh-specific vty tasks */

static FILE *vty_open_pager(struct vty *vty)
{
        if (vty->is_paged)
                return vty->of;

        if (!vtysh_pager_name)
                return NULL;

        vty->of_saved = vty->of;
        vty->of = popen(vtysh_pager_name, "w");
        if (vty->of == NULL) {
                vty->of = vty->of_saved;
                perror("popen");
                exit(1);
        }

        vty->is_paged = true;

        return vty->of;
}

static int vty_close_pager(struct vty *vty)
{
        if (!vty->is_paged)
                return 0;

        fflush(vty->of);
        if (pclose(vty->of) == -1) {
                perror("pclose");
                exit(1);
        }

        vty->of = vty->of_saved;
        vty->is_paged = false;

        return 0;
}

static void vtysh_pager_envdef(bool fallback)
{
        char *pager_defined;

        pager_defined = getenv("VTYSH_PAGER");

        if (pager_defined)
                vtysh_pager_name = strdup(pager_defined);
        else if (fallback)
                vtysh_pager_name = strdup(VTYSH_PAGER);
}

/* --- */

struct vtysh_client vtysh_client[] = {
        {.fd = -1, .name = "zebra", .flag = VTYSH_ZEBRA, .next = NULL},
        {.fd = -1, .name = "ripd", .flag = VTYSH_RIPD, .next = NULL},
        {.fd = -1, .name = "ripngd", .flag = VTYSH_RIPNGD, .next = NULL},
        {.fd = -1, .name = "ospfd", .flag = VTYSH_OSPFD, .next = NULL},
        {.fd = -1, .name = "ospf6d", .flag = VTYSH_OSPF6D, .next = NULL},
        {.fd = -1, .name = "ldpd", .flag = VTYSH_LDPD, .next = NULL},
        {.fd = -1, .name = "bgpd", .flag = VTYSH_BGPD, .next = NULL},
        {.fd = -1, .name = "isisd", .flag = VTYSH_ISISD, .next = NULL},
        {.fd = -1, .name = "pimd", .flag = VTYSH_PIMD, .next = NULL},
        {.fd = -1, .name = "nhrpd", .flag = VTYSH_NHRPD, .next = NULL},
        {.fd = -1, .name = "eigrpd", .flag = VTYSH_EIGRPD, .next = NULL},
        {.fd = -1, .name = "babeld", .flag = VTYSH_BABELD, .next = NULL},
        {.fd = -1, .name = "sharpd", .flag = VTYSH_SHARPD, .next = NULL},
        {.fd = -1, .name = "fabricd", .flag = VTYSH_FABRICD, .next = NULL},
        {.fd = -1, .name = "watchfrr", .flag = VTYSH_WATCHFRR, .next = NULL},
        {.fd = -1, .name = "pbrd", .flag = VTYSH_PBRD, .next = NULL},
        {.fd = -1, .name = "staticd", .flag = VTYSH_STATICD, .next = NULL},
        {.fd = -1, .name = "bfdd", .flag = VTYSH_BFDD, .next = NULL},
        {.fd = -1, .name = "vrrpd", .flag = VTYSH_VRRPD, .next = NULL},
};

/* Searches for client by name, returns index */
static int vtysh_client_lookup(const char *name)
{
        int idx = -1;

        for (unsigned int i = 0; i < array_size(vtysh_client); i++) {
                if (strmatch(vtysh_client[i].name, name)) {
                        idx = i;
                        break;
                }
        }

        return idx;
}

enum vtysh_write_integrated vtysh_write_integrated =
        WRITE_INTEGRATED_UNSPECIFIED;

static int vtysh_reconnect(struct vtysh_client *vclient);

static void vclient_close(struct vtysh_client *vclient)
{
        if (vclient->fd >= 0) {
                if (vty->of)
                        vty_out(vty,
                                "Warning: closing connection to %s because of an I/O error!\n",
                                vclient->name);
                close(vclient->fd);
                /* indicate as candidate for reconnect */
                vclient->fd = VTYSH_WAS_ACTIVE;
        }
}

/*
 * Send a CLI command to a client and read the response.
 *
 * Output will be printed to vty->of. If you want to suppress output, set that
 * to NULL.
 *
 * vclient
 *    the client to send the command to
 *
 * line
 *    the command to send
 *
 * callback
 *    if non-null, this will be called with each line of output received from
 *    the client passed in the second parameter
 *
 * cbarg
 *    optional first argument to pass to callback
 *
 * Returns:
 *    a status code
 */
static int vtysh_client_run(struct vtysh_client *vclient, const char *line,
                            void (*callback)(void *, const char *), void *cbarg)
{
        int ret;
        char stackbuf[4096];
        char *buf = stackbuf;
        size_t bufsz = sizeof(stackbuf);
        char *bufvalid, *end = NULL;
        char terminator[3] = {0, 0, 0};

        /* vclinet was previously active, try to reconnect */
        if (vclient->fd == VTYSH_WAS_ACTIVE) {
                ret = vtysh_reconnect(vclient);
                if (ret < 0)
                        goto out_err;
        }

        if (vclient->fd < 0)
                return CMD_SUCCESS;

        ret = write(vclient->fd, line, strlen(line) + 1);
        if (ret <= 0) {
                /* close connection and try to reconnect */
                vclient_close(vclient);
                ret = vtysh_reconnect(vclient);
                if (ret < 0)
                        goto out_err;
                /* retry line */
                ret = write(vclient->fd, line, strlen(line) + 1);
                if (ret <= 0)
                        goto out_err;
        }

        bufvalid = buf;
        do {
                ssize_t nread =
                        read(vclient->fd, bufvalid, buf + bufsz - bufvalid - 1);

                if (nread < 0 && (errno == EINTR || errno == EAGAIN))
                        continue;

                if (nread <= 0) {
                        if (vty->of)
                                vty_out(vty,
                                        "vtysh: error reading from %s: %s (%d)",
                                        vclient->name, safe_strerror(errno),
                                        errno);
                        goto out_err;
                }

                bufvalid += nread;

                /* Null terminate so we may pass this to *printf later. */
                bufvalid[0] = '\0';

                /*
                 * We expect string output from daemons, so instead of looking
                 * for the full 3 null bytes of the terminator, we check for
                 * just one instead and assume it is the first byte of the
                 * terminator. The presence of the full terminator is checked
                 * later.
                 */
                if (bufvalid - buf >= 4)
                        end = memmem(bufvalid - 4, 4, "\0", 1);

                /*
                 * calculate # bytes we have, up to & not including the
                 * terminator if present
                 */
                size_t textlen = (end ? end : bufvalid) - buf;
                bool b = false;

                /* feed line processing callback if present */
                while (callback && bufvalid > buf && (end > buf || !end)) {
                        textlen = (end ? end : bufvalid) - buf;
                        char *eol = memchr(buf, '\n', textlen);
                        if (eol)
                                /* line break */
                                *eol++ = '\0';
                        else if (end == buf)
                                /*
                                 * no line break, end of input, no text left
                                 * before end; nothing to write
                                 */
                                b = true;
                        else if (end)
                                /* no nl, end of input, but some text left */
                                eol = end;
                        else if (bufvalid == buf + bufsz - 1) {
                                /*
                                 * no nl, no end of input, no buffer space;
                                 * realloc
                                 */
                                char *new;

                                bufsz *= 2;
                                if (buf == stackbuf) {
                                        new = XMALLOC(MTYPE_TMP, bufsz);
                                        memcpy(new, stackbuf, sizeof(stackbuf));
                                } else
                                        new = XREALLOC(MTYPE_TMP, buf, bufsz);

                                bufvalid = bufvalid - buf + new;
                                buf = new;
                                /* if end != NULL, we won't be reading more
                                 * data... */
                                assert(end == NULL);
                                b = true;
                        } else
                                b = true;

                        if (b)
                                break;

                        /* eol is at line end now, either \n => \0 or \0\0\0 */
                        assert(eol && eol <= bufvalid);

                        if (vty->of)
                                vty_out(vty, "%s\n", buf);

                        callback(cbarg, buf);

                        /* shift back data and adjust bufvalid */
                        memmove(buf, eol, bufvalid - eol);
                        bufvalid -= eol - buf;
                        if (end)
                                end -= eol - buf;
                }

                /* else if no callback, dump raw */
                if (!callback) {
                        if (vty->of)
                                vty_out(vty, "%s", buf);
                        memmove(buf, buf + textlen, bufvalid - buf - textlen);
                        bufvalid -= textlen;
                        if (end)
                                end -= textlen;

                        /*
                         * ----------------------------------------------------
                         * At this point `buf` should be in one of two states:
                         * - Empty (i.e. buf == bufvalid)
                         * - Contains up to 4 bytes of the terminator
                         * ----------------------------------------------------
                         */
                        assert(((buf == bufvalid)
                                || (bufvalid - buf <= 4 && buf[0] == 0x00)));
                }

                /* if we have the terminator, break */
                if (end && bufvalid - buf == 4) {
                        assert(!memcmp(buf, terminator, 3));
                        ret = buf[3];
                        break;
                }

        } while (true);
        goto out;

out_err:
        vclient_close(vclient);
        ret = CMD_SUCCESS;
out:
        if (buf != stackbuf)
                XFREE(MTYPE_TMP, buf);
        return ret;
}

static int vtysh_client_run_all(struct vtysh_client *head_client,
                                const char *line, int continue_on_err,
                                void (*callback)(void *, const char *),
                                void *cbarg)
{
        struct vtysh_client *client;
        int rc, rc_all = CMD_SUCCESS;
        int correct_instance = 0, wrong_instance = 0;

        for (client = head_client; client; client = client->next) {
                rc = vtysh_client_run(client, line, callback, cbarg);
                if (rc == CMD_NOT_MY_INSTANCE) {
                        wrong_instance++;
                        continue;
                }
                if (client->fd > 0)
                        correct_instance++;
                if (rc != CMD_SUCCESS) {
                        if (!continue_on_err)
                                return rc;
                        rc_all = rc;
                }
        }
        if (wrong_instance && !correct_instance && vty->of) {
                vty_out(vty,
                        "%% [%s]: command ignored as it targets an instance that is not running\n",
                        head_client->name);
                rc_all = CMD_WARNING_CONFIG_FAILED;
        }
        return rc_all;
}

/*
 * Execute command against all daemons.
 *
 * head_client
 *    where to start walking in the daemon list
 *
 * line
 *    the specific command to execute
 *
 * Returns:
 *    a status code
 */
static int vtysh_client_execute(struct vtysh_client *head_client,
                                const char *line)
{
        return vtysh_client_run_all(head_client, line, 0, NULL, NULL);
}

/* Execute by name */
static int vtysh_client_execute_name(const char *name, const char *line)
{
        int ret = CMD_SUCCESS;
        int idx_client = -1;

        idx_client = vtysh_client_lookup(name);
        if (idx_client != -1)
                ret = vtysh_client_execute(&vtysh_client[idx_client], line);
        else {
                vty_out(vty, "Client not found\n");
                ret = CMD_WARNING;
        }

        return ret;
}

/*
 * Retrieve all running config from daemons and parse it with the vtysh config
 * parser. Returned output is not displayed to the user.
 *
 * head_client
 *    where to start walking in the daemon list
 *
 * line
 *    the specific command to execute
 */
static void vtysh_client_config(struct vtysh_client *head_client, char *line)
{
        /* watchfrr currently doesn't load any config, and has some hardcoded
         * settings that show up in "show run".  skip it here (for now at
         * least) so we don't get that mangled up in config-write.
         */
        if (head_client->flag == VTYSH_WATCHFRR)
                return;

        /* suppress output to user */
        vty->of_saved = vty->of;
        vty->of = NULL;
        vtysh_client_run_all(head_client, line, 1, vtysh_config_parse_line,
                             NULL);
        vty->of = vty->of_saved;
}

/* Command execution over the vty interface. */
static int vtysh_execute_func(const char *line, int pager)
{
        int ret, cmd_stat;
        unsigned int i;
        vector vline;
        const struct cmd_element *cmd;
        int tried = 0;
        int saved_ret, saved_node;

        /* Split readline string up into the vector. */
        vline = cmd_make_strvec(line);

        if (vline == NULL)
                return CMD_SUCCESS;

        if (user_mode) {
                if (strncmp("en", vector_slot(vline, 0), 2) == 0) {
                        cmd_free_strvec(vline);
                        vty_out(vty, "%% Command not allowed: enable\n");
                        return CMD_WARNING;
                }
        }

        saved_ret = ret = cmd_execute(vty, line, &cmd, 1);
        saved_node = vty->node;

        /*
         * If command doesn't succeeded in current node, try to walk up in node
         * tree. Changing vty->node is enough to try it just out without actual
         * walkup in the vtysh.
         */
        while (ret != CMD_SUCCESS && ret != CMD_SUCCESS_DAEMON
               && ret != CMD_WARNING && ret != CMD_WARNING_CONFIG_FAILED
               && vty->node > CONFIG_NODE) {
                vty->node = node_parent(vty->node);
                ret = cmd_execute(vty, line, &cmd, 1);
                tried++;
        }

        vty->node = saved_node;

        /*
         * If command succeeded in any other node than current (tried > 0) we
         * have to move into node in the vtysh where it succeeded.
         */
        if (ret == CMD_SUCCESS || ret == CMD_SUCCESS_DAEMON
            || ret == CMD_WARNING) {
                if ((saved_node == BGP_VPNV4_NODE
                     || saved_node == BGP_VPNV6_NODE
                     || saved_node == BGP_IPV4_NODE
                     || saved_node == BGP_IPV6_NODE
                     || saved_node == BGP_FLOWSPECV4_NODE
                     || saved_node == BGP_FLOWSPECV6_NODE
                     || saved_node == BGP_IPV4M_NODE
                     || saved_node == BGP_IPV4L_NODE
                     || saved_node == BGP_IPV6L_NODE
                     || saved_node == BGP_IPV6M_NODE
                     || saved_node == BGP_EVPN_NODE
                     || saved_node == LDP_IPV4_NODE
                     || saved_node == LDP_IPV6_NODE)
                    && (tried == 1)) {
                        vtysh_execute("exit-address-family");
                } else if ((saved_node == BGP_EVPN_VNI_NODE) && (tried == 1)) {
                        vtysh_execute("exit-vni");
                } else if (saved_node == BGP_VRF_POLICY_NODE && (tried == 1)) {
                        vtysh_execute("exit-vrf-policy");
                } else if ((saved_node == BGP_VNC_DEFAULTS_NODE
                            || saved_node == BGP_VNC_NVE_GROUP_NODE
                            || saved_node == BGP_VNC_L2_GROUP_NODE)
                           && (tried == 1)) {
                        vtysh_execute("exit-vnc");
                } else if (saved_node == VRF_NODE && (tried == 1)) {
                        vtysh_execute("exit-vrf");
                } else if ((saved_node == KEYCHAIN_KEY_NODE
                            || saved_node == LDP_PSEUDOWIRE_NODE
                            || saved_node == LDP_IPV4_IFACE_NODE
                            || saved_node == LDP_IPV6_IFACE_NODE)
                           && (tried == 1)) {
                        vtysh_execute("exit");
                } else if (tried) {
                        vtysh_execute("end");
                        vtysh_execute("configure");
                }
        }
        /*
         * If command didn't succeed in any node, continue with return value
         * from first try.
         */
        else if (tried) {
                ret = saved_ret;
        }

        cmd_free_strvec(vline);

        cmd_stat = ret;
        switch (ret) {
        case CMD_WARNING:
        case CMD_WARNING_CONFIG_FAILED:
                if (vty->type == VTY_FILE)
                        vty_out(vty, "Warning...\n");
                break;
        case CMD_ERR_AMBIGUOUS:
                vty_out(vty, "%% Ambiguous command: %s\n", line);
                break;
        case CMD_ERR_NO_MATCH:
                vty_out(vty, "%% Unknown command: %s\n", line);
                break;
        case CMD_ERR_INCOMPLETE:
                vty_out(vty, "%% Command incomplete: %s\n", line);
                break;
        case CMD_SUCCESS_DAEMON: {
                /*
                 * FIXME: Don't open pager for exit commands. popen() causes
                 * problems if exited from vtysh at all. This hack shouldn't
                 * cause any problem but is really ugly.
                 */
                if (pager && strncmp(line, "exit", 4))
                        vty_open_pager(vty);

                if (!strcmp(cmd->string, "configure")) {
                        for (i = 0; i < array_size(vtysh_client); i++) {
                                cmd_stat = vtysh_client_execute(
                                        &vtysh_client[i], line);
                                if (cmd_stat == CMD_WARNING)
                                        break;
                        }

                        if (cmd_stat) {
                                line = "end";
                                vline = cmd_make_strvec(line);


                                if (vline == NULL) {
                                        if (vty->is_paged)
                                                vty_close_pager(vty);
                                        return CMD_SUCCESS;
                                }

                                ret = cmd_execute_command(vline, vty, &cmd, 1);
                                cmd_free_strvec(vline);
                                if (ret != CMD_SUCCESS_DAEMON)
                                        break;
                        } else if (cmd->func) {
                                (*cmd->func)(cmd, vty, 0, NULL);
                                break;
                        }
                }

                cmd_stat = CMD_SUCCESS;
                struct vtysh_client *vc;
                for (i = 0; i < array_size(vtysh_client); i++) {
                        if (cmd->daemon & vtysh_client[i].flag) {
                                if (vtysh_client[i].fd < 0
                                    && (cmd->daemon == vtysh_client[i].flag)) {
                                        for (vc = &vtysh_client[i]; vc;
                                             vc = vc->next)
                                                if (vc->fd == VTYSH_WAS_ACTIVE)
                                                        vtysh_reconnect(vc);
                                }
                                if (vtysh_client[i].fd < 0
                                    && (cmd->daemon == vtysh_client[i].flag)) {
                                        bool any_inst = false;
                                        for (vc = &vtysh_client[i]; vc;
                                             vc = vc->next)
                                                any_inst = any_inst
                                                           || (vc->fd > 0);
                                        if (!any_inst) {
                                                fprintf(stderr,
                                                        "%s is not running\n",
                                                        vtysh_client[i].name);
                                                continue;
                                        }
                                }
                                cmd_stat = vtysh_client_execute(
                                        &vtysh_client[i], line);
                                if (cmd_stat != CMD_SUCCESS)
                                        break;
                        }
                }
                if (cmd_stat != CMD_SUCCESS)
                        break;

                if (cmd->func)
                        (*cmd->func)(cmd, vty, 0, NULL);
        }
        }
        if (vty->is_paged)
                vty_close_pager(vty);

        return cmd_stat;
}

int vtysh_execute_no_pager(const char *line)
{
        return vtysh_execute_func(line, 0);
}

int vtysh_execute(const char *line)
{
        return vtysh_execute_func(line, 1);
}

static char *trim(char *s)
{
        size_t size;
        char *end;

        size = strlen(s);

        if (!size)
                return s;

        end = s + size - 1;
        while (end >= s && isspace((unsigned char)*end))
                end--;
        *(end + 1) = '\0';

        while (*s && isspace((unsigned char)*s))
                s++;

        return s;
}

int vtysh_mark_file(const char *filename)
{
        struct vty *vty;
        FILE *confp = NULL;
        int ret;
        vector vline;
        int tried = 0;
        const struct cmd_element *cmd;
        int saved_ret, prev_node;
        int lineno = 0;
        char *vty_buf_copy = NULL;
        char *vty_buf_trimmed = NULL;

        if (strncmp("-", filename, 1) == 0)
                confp = stdin;
        else
                confp = fopen(filename, "r");

        if (confp == NULL) {
                fprintf(stderr, "%% Can't open config file %s due to '%s'.\n",
                        filename, safe_strerror(errno));
                return (CMD_ERR_NO_FILE);
        }

        vty = vty_new();
        vty->wfd = STDERR_FILENO;
        vty->type = VTY_TERM;
        vty->node = CONFIG_NODE;

        vtysh_execute_no_pager("enable");
        vtysh_execute_no_pager("configure");
        vty_buf_copy = XCALLOC(MTYPE_VTYSH_CMD, VTY_BUFSIZ);

        while (fgets(vty->buf, VTY_BUFSIZ, confp)) {
                lineno++;
                tried = 0;
                strlcpy(vty_buf_copy, vty->buf, VTY_BUFSIZ);
                vty_buf_trimmed = trim(vty_buf_copy);

                switch (vty->node) {
                case LDP_IPV4_IFACE_NODE:
                        if (strncmp(vty_buf_copy, "   ", 3)) {
                                vty_out(vty, "  end\n");
                                vty->node = LDP_IPV4_NODE;
                        }
                        break;
                case LDP_IPV6_IFACE_NODE:
                        if (strncmp(vty_buf_copy, "   ", 3)) {
                                vty_out(vty, "  end\n");
                                vty->node = LDP_IPV6_NODE;
                        }
                        break;
                case LDP_PSEUDOWIRE_NODE:
                        if (strncmp(vty_buf_copy, "  ", 2)) {
                                vty_out(vty, " end\n");
                                vty->node = LDP_L2VPN_NODE;
                        }
                        break;
                default:
                        break;
                }

                if (vty_buf_trimmed[0] == '!' || vty_buf_trimmed[0] == '#') {
                        vty_out(vty, "%s", vty->buf);
                        continue;
                }

                /* Split readline string up into the vector. */
                vline = cmd_make_strvec(vty->buf);

                if (vline == NULL) {
                        vty_out(vty, "%s", vty->buf);
                        continue;
                }

                /*
                 * Ignore the "end" lines, we will generate these where
                 * appropriate
                 */
                if (strlen(vty_buf_trimmed) == 3
                    && strncmp("end", vty_buf_trimmed, 3) == 0) {
                        cmd_free_strvec(vline);
                        continue;
                }

                prev_node = vty->node;
                saved_ret = ret = cmd_execute_command_strict(vline, vty, &cmd);

                /*
                 * If command doesn't succeeded in current node, try to walk up
                 * in node tree. Changing vty->node is enough to try it just
                 * out without actual walkup in the vtysh.
                 */
                while (ret != CMD_SUCCESS && ret != CMD_SUCCESS_DAEMON
                       && ret != CMD_WARNING && ret != CMD_WARNING_CONFIG_FAILED
                       && vty->node > CONFIG_NODE) {
                        vty->node = node_parent(vty->node);
                        ret = cmd_execute_command_strict(vline, vty, &cmd);
                        tried++;
                }

                /*
                 * If command succeeded in any other node than current (tried >
                 * 0) we have to move into node in the vtysh where it
                 * succeeded.
                 */
                if (ret == CMD_SUCCESS || ret == CMD_SUCCESS_DAEMON
                    || ret == CMD_WARNING) {
                        if ((prev_node == BGP_VPNV4_NODE
                             || prev_node == BGP_VPNV6_NODE
                             || prev_node == BGP_IPV4_NODE
                             || prev_node == BGP_IPV6_NODE
                             || prev_node == BGP_FLOWSPECV4_NODE
                             || prev_node == BGP_FLOWSPECV6_NODE
                             || prev_node == BGP_IPV4L_NODE
                             || prev_node == BGP_IPV6L_NODE
                             || prev_node == BGP_IPV4M_NODE
                             || prev_node == BGP_IPV6M_NODE
                             || prev_node == BGP_EVPN_NODE)
                            && (tried == 1)) {
                                vty_out(vty, "exit-address-family\n");
                        } else if ((prev_node == BGP_EVPN_VNI_NODE)
                                   && (tried == 1)) {
                                vty_out(vty, "exit-vni\n");
                        } else if ((prev_node == KEYCHAIN_KEY_NODE)
                                   && (tried == 1)) {
                                vty_out(vty, "exit\n");
                        } else if (tried) {
                                vty_out(vty, "end\n");
                        }
                }
                /*
                 * If command didn't succeed in any node, continue with return
                 * value from first try.
                 */
                else if (tried) {
                        ret = saved_ret;
                        vty->node = prev_node;
                }

                cmd_free_strvec(vline);
                switch (ret) {
                case CMD_WARNING:
                case CMD_WARNING_CONFIG_FAILED:
                        if (vty->type == VTY_FILE)
                                fprintf(stderr, "line %d: Warning...: %s\n",
                                        lineno, vty->buf);
                        fclose(confp);
                        vty_close(vty);
                        XFREE(MTYPE_VTYSH_CMD, vty_buf_copy);
                        return ret;
                case CMD_ERR_AMBIGUOUS:
                        fprintf(stderr, "line %d: %% Ambiguous command: %s\n",
                                lineno, vty->buf);
                        fclose(confp);
                        vty_close(vty);
                        XFREE(MTYPE_VTYSH_CMD, vty_buf_copy);
                        return CMD_ERR_AMBIGUOUS;
                case CMD_ERR_NO_MATCH:
                        fprintf(stderr, "line %d: %% Unknown command: %s\n",
                                lineno, vty->buf);
                        fclose(confp);
                        vty_close(vty);
                        XFREE(MTYPE_VTYSH_CMD, vty_buf_copy);
                        return CMD_ERR_NO_MATCH;
                case CMD_ERR_INCOMPLETE:
                        fprintf(stderr, "line %d: %% Command incomplete: %s\n",
                                lineno, vty->buf);
                        fclose(confp);
                        vty_close(vty);
                        XFREE(MTYPE_VTYSH_CMD, vty_buf_copy);
                        return CMD_ERR_INCOMPLETE;
                case CMD_SUCCESS:
                        vty_out(vty, "%s", vty->buf);
                        if (strmatch(vty_buf_trimmed, "exit-vrf"))
                                vty_out(vty, "end\n");
                        break;
                case CMD_SUCCESS_DAEMON: {
                        int cmd_stat;

                        vty_out(vty, "%s", vty->buf);
                        if (strmatch(vty_buf_trimmed, "exit-vrf"))
                                vty_out(vty, "end\n");
                        cmd_stat = vtysh_client_execute(&vtysh_client[0],
                                                        vty->buf);
                        if (cmd_stat != CMD_SUCCESS)
                                break;

                        if (cmd->func)
                                (*cmd->func)(cmd, vty, 0, NULL);
                }
                }
        }
        /* This is the end */
        vty_out(vty, "\nend\n");
        vty_close(vty);
        XFREE(MTYPE_VTYSH_CMD, vty_buf_copy);

        if (confp != stdin)
                fclose(confp);

        return (0);
}

/* Configration make from file. */
int vtysh_config_from_file(struct vty *vty, FILE *fp)
{
        int ret;
        const struct cmd_element *cmd;
        int lineno = 0;
        /* once we have an error, we remember & return that */
        int retcode = CMD_SUCCESS;

        while (fgets(vty->buf, VTY_BUFSIZ, fp)) {
                lineno++;

                ret = command_config_read_one_line(vty, &cmd, lineno, 1);

                switch (ret) {
                case CMD_WARNING:
                case CMD_WARNING_CONFIG_FAILED:
                        if (vty->type == VTY_FILE)
                                fprintf(stderr, "line %d: Warning[%d]...: %s\n",
                                        lineno, vty->node, vty->buf);
                        retcode = ret;

                        break;
                case CMD_ERR_AMBIGUOUS:
                        fprintf(stderr,
                                "line %d: %% Ambiguous command[%d]: %s\n",
                                lineno, vty->node, vty->buf);
                        retcode = CMD_ERR_AMBIGUOUS;
                        break;
                case CMD_ERR_NO_MATCH:
                        fprintf(stderr, "line %d: %% Unknown command[%d]: %s",
                                lineno, vty->node, vty->buf);
                        retcode = CMD_ERR_NO_MATCH;
                        break;
                case CMD_ERR_INCOMPLETE:
                        fprintf(stderr,
                                "line %d: %% Command incomplete[%d]: %s\n",
                                lineno, vty->node, vty->buf);
                        retcode = CMD_ERR_INCOMPLETE;
                        break;
                case CMD_SUCCESS_DAEMON: {
                        unsigned int i;
                        int cmd_stat = CMD_SUCCESS;

                        for (i = 0; i < array_size(vtysh_client); i++) {
                                if (cmd->daemon & vtysh_client[i].flag) {
                                        cmd_stat = vtysh_client_execute(
                                                &vtysh_client[i], vty->buf);
                                        /*
                                         * CMD_WARNING - Can mean that the
                                         * command was parsed successfully but
                                         * it was already entered in a few
                                         * spots. As such if we receive a
                                         * CMD_WARNING from a daemon we
                                         * shouldn't stop talking to the other
                                         * daemons for the particular command.
                                         */
                                        if (cmd_stat != CMD_SUCCESS
                                            && cmd_stat != CMD_WARNING) {
                                                fprintf(stderr,
                                                        "line %d: Failure to communicate[%d] to %s, line: %s\n",
                                                        lineno, cmd_stat,
                                                        vtysh_client[i].name,
                                                        vty->buf);
                                                retcode = cmd_stat;
                                                break;
                                        }
                                }
                        }
                        if (cmd_stat != CMD_SUCCESS)
                                break;

                        if (cmd->func)
                                (*cmd->func)(cmd, vty, 0, NULL);
                }
                }
        }

        return (retcode);
}

/*
 * Function processes cli commands terminated with '?' character when entered
 * through either 'vtysh' or 'vtysh -c' interfaces.
 */
static int vtysh_process_questionmark(const char *input, int input_len)
{
        int ret, width = 0;
        unsigned int i;
        vector vline, describe;
        struct cmd_token *token;

        if (!input)
                return 1;

        vline = cmd_make_strvec(input);

        /* In case of '> ?'. */
        if (vline == NULL) {
                vline = vector_init(1);
                vector_set(vline, NULL);
        } else if (input_len && isspace((unsigned char)input[input_len - 1]))
                vector_set(vline, NULL);

        describe = cmd_describe_command(vline, vty, &ret);

        /* Ambiguous and no match error. */
        switch (ret) {
        case CMD_ERR_AMBIGUOUS:
                cmd_free_strvec(vline);
                vector_free(describe);
                vty_out(vty, "%% Ambiguous command.\n");
                rl_on_new_line();
                return 0;
                break;
        case CMD_ERR_NO_MATCH:
                cmd_free_strvec(vline);
                if (describe)
                        vector_free(describe);
                vty_out(vty, "%% There is no matched command.\n");
                rl_on_new_line();
                return 0;
                break;
        }

        /* Get width of command string. */
        width = 0;
        for (i = 0; i < vector_active(describe); i++)
                if ((token = vector_slot(describe, i)) != NULL) {
                        if (token->text[0] == '\0')
                                continue;

                        int len = strlen(token->text);

                        if (width < len)
                                width = len;
                }

        for (i = 0; i < vector_active(describe); i++)
                if ((token = vector_slot(describe, i)) != NULL) {
                        if (!token->desc)
                                vty_out(vty, "  %-s\n", token->text);
                        else
                                vty_out(vty, "  %-*s  %s\n", width, token->text,
                                        token->desc);

                        if (IS_VARYING_TOKEN(token->type)) {
                                const char *ref = vector_slot(
                                        vline, vector_active(vline) - 1);

                                vector varcomps = vector_init(VECTOR_MIN_SIZE);
                                cmd_variable_complete(token, ref, varcomps);

                                if (vector_active(varcomps) > 0) {
                                        int rows, cols;
                                        rl_get_screen_size(&rows, &cols);

                                        char *ac = cmd_variable_comp2str(
                                                varcomps, cols);
                                        vty_out(vty, "%s\n", ac);
                                        XFREE(MTYPE_TMP, ac);
                                }

                                vector_free(varcomps);
                        }
                }

        cmd_free_strvec(vline);
        vector_free(describe);

        return 0;
}

/*
 * Entry point for user commands terminated with '?' character and typed through
 * the usual vtysh's stdin interface. This is the function being registered with
 * readline() api's.
 */
static int vtysh_rl_describe(int a, int b)
{
        int ret;

        vty_out(vty, "\n");

        ret = vtysh_process_questionmark(rl_line_buffer, rl_end);
        rl_on_new_line();

        return ret;
}

/*
 * Function in charged of processing vtysh instructions terminating with '?'
 * character and received through the 'vtysh -c' interface. If user's
 * instruction is well-formatted, we will call the same processing routine
 * utilized by the traditional vtysh's stdin interface.
 */
int vtysh_execute_command_questionmark(char *input)
{
        int input_len, qmark_count = 0;
        const char *str;

        if (!(input && *input))
                return 1;

        /* Finding out question_mark count and strlen */
        for (str = input; *str; ++str) {
                if (*str == '?')
                        qmark_count++;
        }
        input_len = str - input;

        /*
         * Verify that user's input terminates in '?' and that patterns such as
         * 'cmd ? subcmd ?' are prevented.
         */
        if (qmark_count != 1 || input[input_len - 1] != '?')
                return 1;

        /*
         * Questionmark-processing function is not expecting to receive '?'
         * character in input string.
         */
        input[input_len - 1] = '\0';

        return vtysh_process_questionmark(input, input_len - 1);
}

/* Result of cmd_complete_command() call will be stored here
 * and used in new_completion() in order to put the space in
 * correct places only. */
int complete_status;

static char *command_generator(const char *text, int state)
{
        vector vline;
        static char **matched = NULL;
        static int index = 0;

        /* First call. */
        if (!state) {
                index = 0;

                if (vty->node == AUTH_NODE || vty->node == AUTH_ENABLE_NODE)
                        return NULL;

                vline = cmd_make_strvec(rl_line_buffer);
                if (vline == NULL)
                        return NULL;

                if (rl_end &&
                    isspace((unsigned char)rl_line_buffer[rl_end - 1]))
                        vector_set(vline, NULL);

                matched = cmd_complete_command(vline, vty, &complete_status);
                cmd_free_strvec(vline);
        }

        if (matched && matched[index])
                /*
                 * this is free()'d by readline, but we leak 1 count of
                 * MTYPE_COMPLETION
                 */
                return matched[index++];

        XFREE(MTYPE_TMP, matched);
        matched = NULL;

        return NULL;
}

static char **new_completion(const char *text, int start, int end)
{
        char **matches;

        matches = rl_completion_matches(text, command_generator);

        if (matches) {
                rl_point = rl_end;
                if (complete_status != CMD_COMPLETE_FULL_MATCH)
                        /* only append a space on full match */
                        rl_completion_append_character = '\0';
        }

        return matches;
}

/* Vty node structures. */
static struct cmd_node bgp_node = {
        BGP_NODE, "%s(config-router)# ",
};

static struct cmd_node rip_node = {
        RIP_NODE, "%s(config-router)# ",
};

static struct cmd_node isis_node = {
        ISIS_NODE, "%s(config-router)# ",
};

static struct cmd_node openfabric_node = {
        OPENFABRIC_NODE, "%s(config-router)# ",
};

static struct cmd_node interface_node = {
        INTERFACE_NODE, "%s(config-if)# ",
};

static struct cmd_node pw_node = {
        PW_NODE, "%s(config-pw)# ",
};

static struct cmd_node vrf_node = {
        VRF_NODE, "%s(config-vrf)# ",
};

static struct cmd_node nh_group_node = {
        NH_GROUP_NODE,
        "%s(config-nh-group)# ",
};

static struct cmd_node rmap_node = {RMAP_NODE, "%s(config-route-map)# "};

static struct cmd_node pbr_map_node = {PBRMAP_NODE, "%s(config-pbr-map)# "};

static struct cmd_node zebra_node = {ZEBRA_NODE, "%s(config-router)# "};

static struct cmd_node bgp_vpnv4_node = {BGP_VPNV4_NODE,
                                         "%s(config-router-af)# "};

static struct cmd_node bgp_vpnv6_node = {BGP_VPNV6_NODE,
                                         "%s(config-router-af)# "};

static struct cmd_node bgp_flowspecv4_node = {BGP_FLOWSPECV4_NODE,
                                        "%s(config-router-af)# "};

static struct cmd_node bgp_flowspecv6_node = {BGP_FLOWSPECV6_NODE,
                                        "%s(config-router-af)# "};

static struct cmd_node bgp_ipv4_node = {BGP_IPV4_NODE,
                                        "%s(config-router-af)# "};

static struct cmd_node bgp_ipv4m_node = {BGP_IPV4M_NODE,
                                         "%s(config-router-af)# "};

static struct cmd_node bgp_ipv4l_node = {BGP_IPV4L_NODE,
                                         "%s(config-router-af)# "};

static struct cmd_node bgp_ipv6_node = {BGP_IPV6_NODE,
                                        "%s(config-router-af)# "};

static struct cmd_node bgp_ipv6m_node = {BGP_IPV6M_NODE,
                                         "%s(config-router-af)# "};

static struct cmd_node bgp_evpn_node = {BGP_EVPN_NODE,
                                        "%s(config-router-af)# "};

static struct cmd_node bgp_evpn_vni_node = {BGP_EVPN_VNI_NODE,
                                            "%s(config-router-af-vni)# "};

static struct cmd_node bgp_ipv6l_node = {BGP_IPV6L_NODE,
                                         "%s(config-router-af)# "};

static struct cmd_node bgp_vnc_defaults_node = {
        BGP_VNC_DEFAULTS_NODE, "%s(config-router-vnc-defaults)# "};

static struct cmd_node bgp_vnc_nve_group_node = {
        BGP_VNC_NVE_GROUP_NODE, "%s(config-router-vnc-nve-group)# "};

static struct cmd_node bgp_vrf_policy_node = {BGP_VRF_POLICY_NODE,
                                              "%s(config-router-vrf-policy)# "};

static struct cmd_node bgp_vnc_l2_group_node = {
        BGP_VNC_L2_GROUP_NODE, "%s(config-router-vnc-l2-group)# "};

static struct cmd_node bmp_node = {BMP_NODE, "%s(config-bgp-bmp)# "};

static struct cmd_node ospf_node = {OSPF_NODE, "%s(config-router)# "};

static struct cmd_node eigrp_node = {EIGRP_NODE, "%s(config-router)# "};

static struct cmd_node babel_node = {BABEL_NODE, "%s(config-router)# "};

static struct cmd_node ripng_node = {RIPNG_NODE, "%s(config-router)# "};

static struct cmd_node ospf6_node = {OSPF6_NODE, "%s(config-ospf6)# "};

static struct cmd_node ldp_node = {LDP_NODE, "%s(config-ldp)# "};

static struct cmd_node ldp_ipv4_node = {LDP_IPV4_NODE, "%s(config-ldp-af)# "};

static struct cmd_node ldp_ipv6_node = {LDP_IPV6_NODE, "%s(config-ldp-af)# "};

static struct cmd_node ldp_ipv4_iface_node = {LDP_IPV4_IFACE_NODE,
                                              "%s(config-ldp-af-if)# "};

static struct cmd_node ldp_ipv6_iface_node = {LDP_IPV6_IFACE_NODE,
                                              "%s(config-ldp-af-if)# "};

static struct cmd_node ldp_l2vpn_node = {LDP_L2VPN_NODE, "%s(config-l2vpn)# "};

static struct cmd_node ldp_pseudowire_node = {LDP_PSEUDOWIRE_NODE,
                                              "%s(config-l2vpn-pw)# "};

static struct cmd_node keychain_node = {KEYCHAIN_NODE, "%s(config-keychain)# "};

static struct cmd_node keychain_key_node = {KEYCHAIN_KEY_NODE,
                                            "%s(config-keychain-key)# "};

struct cmd_node link_params_node = {
        LINK_PARAMS_NODE, "%s(config-link-params)# ",
};

static struct cmd_node rpki_node = {RPKI_NODE, "%s(config-rpki)# ", 1};

#if HAVE_BFDD > 0
static struct cmd_node bfd_node = {
        BFD_NODE,
        "%s(config-bfd)# ",
};

static struct cmd_node bfd_peer_node = {
        BFD_PEER_NODE,
        "%s(config-bfd-peer)# ",
};
#endif /* HAVE_BFDD */

/* Defined in lib/vty.c */
extern struct cmd_node vty_node;

/* When '^Z' is received from vty, move down to the enable mode. */
static int vtysh_end(void)
{
        switch (vty->node) {
        case VIEW_NODE:
        case ENABLE_NODE:
                /* Nothing to do. */
                break;
        default:
                vty->node = ENABLE_NODE;
                break;
        }
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_REALLYALL, vtysh_end_all, vtysh_end_all_cmd, "end",
        "End current mode and change to enable mode\n")
{
        return vtysh_end();
}

DEFUNSH(VTYSH_BGPD, router_bgp, router_bgp_cmd,
        "router bgp [(1-4294967295)$instasn [<view|vrf> WORD]]",
        ROUTER_STR BGP_STR AS_STR
        "BGP view\nBGP VRF\n"
        "View/VRF name\n")
{
        vty->node = BGP_NODE;
        return CMD_SUCCESS;
}

#ifdef KEEP_OLD_VPN_COMMANDS
DEFUNSH(VTYSH_BGPD, address_family_vpnv4, address_family_vpnv4_cmd,
        "address-family vpnv4 [unicast]",
        "Enter Address Family command mode\n"
        "Address Family\n"
        "Address Family modifier\n")
{
        vty->node = BGP_VPNV4_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_BGPD, address_family_vpnv6, address_family_vpnv6_cmd,
        "address-family vpnv6 [unicast]",
        "Enter Address Family command mode\n"
        "Address Family\n"
        "Address Family modifier\n")
{
        vty->node = BGP_VPNV6_NODE;
        return CMD_SUCCESS;
}
#endif /* KEEP_OLD_VPN_COMMANDS */

DEFUNSH(VTYSH_BGPD, address_family_ipv4, address_family_ipv4_cmd,
        "address-family ipv4 [unicast]",
        "Enter Address Family command mode\n"
        "Address Family\n"
        "Address Family Modifier\n")
{
        vty->node = BGP_IPV4_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_BGPD, address_family_flowspecv4, address_family_flowspecv4_cmd,
        "address-family ipv4 flowspec",
        "Enter Address Family command mode\n"
        "Address Family\n"
        "Address Family Modifier\n")
{
        vty->node = BGP_FLOWSPECV4_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_BGPD, address_family_flowspecv6, address_family_flowspecv6_cmd,
        "address-family ipv6 flowspec",
        "Enter Address Family command mode\n"
        "Address Family\n"
        "Address Family Modifier\n")
{
        vty->node = BGP_FLOWSPECV6_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_BGPD, address_family_ipv4_multicast,
        address_family_ipv4_multicast_cmd, "address-family ipv4 multicast",
        "Enter Address Family command mode\n"
        "Address Family\n"
        "Address Family modifier\n")
{
        vty->node = BGP_IPV4M_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_BGPD, address_family_ipv4_vpn, address_family_ipv4_vpn_cmd,
        "address-family ipv4 vpn",
        "Enter Address Family command mode\n"
        "Address Family\n"
        "Address Family modifier\n")
{
        vty->node = BGP_VPNV4_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_BGPD, address_family_ipv4_labeled_unicast,
        address_family_ipv4_labeled_unicast_cmd,
        "address-family ipv4 labeled-unicast",
        "Enter Address Family command mode\n"
        "Address Family\n"
        "Address Family modifier\n")
{
        vty->node = BGP_IPV4L_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_BGPD, address_family_ipv6, address_family_ipv6_cmd,
        "address-family ipv6 [unicast]",
        "Enter Address Family command mode\n"
        "Address Family\n"
        "Address Family modifier\n")
{
        vty->node = BGP_IPV6_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_BGPD, address_family_ipv6_multicast,
        address_family_ipv6_multicast_cmd, "address-family ipv6 multicast",
        "Enter Address Family command mode\n"
        "Address Family\n"
        "Address Family modifier\n")
{
        vty->node = BGP_IPV6M_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_BGPD, address_family_ipv6_vpn, address_family_ipv6_vpn_cmd,
        "address-family ipv6 vpn",
        "Enter Address Family command mode\n"
        "Address Family\n"
        "Address Family modifier\n")
{
        vty->node = BGP_VPNV6_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_BGPD, address_family_ipv6_labeled_unicast,
        address_family_ipv6_labeled_unicast_cmd,
        "address-family ipv6 labeled-unicast",
        "Enter Address Family command mode\n"
        "Address Family\n"
        "Address Family modifier\n")
{
        vty->node = BGP_IPV6L_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_BGPD,
        rpki,
        rpki_cmd,
        "rpki",
        "Enable rpki and enter rpki configuration mode\n")
{
        vty->node = RPKI_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_BGPD,
        bmp_targets,
        bmp_targets_cmd,
        "bmp targets BMPTARGETS",
        "BGP Monitoring Protocol\n"
        "Create BMP target group\n"
        "Name of the BMP target group\n")
{
        vty->node = BMP_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_BGPD, address_family_evpn, address_family_evpn_cmd,
        "address-family <l2vpn evpn>",
        "Enter Address Family command mode\n"
        "Address Family\n"
        "Address Family modifier\n")
{
        vty->node = BGP_EVPN_NODE;
        return CMD_SUCCESS;
}

#if defined(HAVE_CUMULUS)
DEFUNSH_HIDDEN(VTYSH_BGPD, address_family_evpn2, address_family_evpn2_cmd,
               "address-family evpn",
               "Enter Address Family command mode\n"
               "EVPN Address family\n")
{
        vty->node = BGP_EVPN_NODE;
        return CMD_SUCCESS;
}
#endif

DEFUNSH(VTYSH_BGPD, bgp_evpn_vni, bgp_evpn_vni_cmd, "vni " CMD_VNI_RANGE,
        "VXLAN Network Identifier\n"
        "VNI number\n")
{
        vty->node = BGP_EVPN_VNI_NODE;
        return CMD_SUCCESS;
}

#if defined(ENABLE_BGP_VNC)
DEFUNSH(VTYSH_BGPD, vnc_defaults, vnc_defaults_cmd, "vnc defaults",
        "VNC/RFP related configuration\n"
        "Configure default NVE group\n")
{
        vty->node = BGP_VNC_DEFAULTS_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_BGPD, vnc_nve_group, vnc_nve_group_cmd, "vnc nve-group NAME",
        "VNC/RFP related configuration\n"
        "Configure a NVE group\n"
        "Group name\n")
{
        vty->node = BGP_VNC_NVE_GROUP_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_BGPD, vnc_vrf_policy, vnc_vrf_policy_cmd, "vrf-policy NAME",
        "Configure a VRF policy group\n"
        "Group name\n")
{
        vty->node = BGP_VRF_POLICY_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_BGPD, vnc_l2_group, vnc_l2_group_cmd, "vnc l2-group NAME",
        "VNC/RFP related configuration\n"
        "Configure a L2 group\n"
        "Group name\n")
{
        vty->node = BGP_VNC_L2_GROUP_NODE;
        return CMD_SUCCESS;
}
#endif

DEFUNSH(VTYSH_KEYS, key_chain, key_chain_cmd, "key chain WORD",
        "Authentication key management\n"
        "Key-chain management\n"
        "Key-chain name\n")
{
        vty->node = KEYCHAIN_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_KEYS, key, key_cmd, "key (0-2147483647)",
        "Configure a key\n"
        "Key identifier number\n")
{
        vty->node = KEYCHAIN_KEY_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_RIPD, router_rip, router_rip_cmd, "router rip [vrf NAME]",
        ROUTER_STR "RIP\n" VRF_CMD_HELP_STR)
{
        vty->node = RIP_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_RIPNGD, router_ripng, router_ripng_cmd, "router ripng [vrf NAME]",
        ROUTER_STR "RIPng\n" VRF_CMD_HELP_STR)
{
        vty->node = RIPNG_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_OSPFD, router_ospf, router_ospf_cmd,
        "router ospf [(1-65535)] [vrf NAME]",
        "Enable a routing process\n"
        "Start OSPF configuration\n"
        "Instance ID\n"
        VRF_CMD_HELP_STR)
{
        vty->node = OSPF_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_EIGRPD, router_eigrp, router_eigrp_cmd, "router eigrp (1-65535)",
        "Enable a routing process\n"
        "Start EIGRP configuration\n"
        "AS number to use\n")
{
        vty->node = EIGRP_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_BABELD, router_babel, router_babel_cmd, "router babel",
        "Enable a routing process\n"
        "Make Babel instance command\n")
{
        vty->node = BABEL_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_OSPF6D, router_ospf6, router_ospf6_cmd, "router ospf6",
        ROUTER_STR OSPF6_STR)
{
        vty->node = OSPF6_NODE;
        return CMD_SUCCESS;
}

#if defined(HAVE_LDPD)
DEFUNSH(VTYSH_LDPD, ldp_mpls_ldp, ldp_mpls_ldp_cmd, "mpls ldp",
        "Global MPLS configuration subcommands\n"
        "Label Distribution Protocol\n")
{
        vty->node = LDP_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_LDPD, ldp_address_family_ipv4, ldp_address_family_ipv4_cmd,
        "address-family ipv4",
        "Configure Address Family and its parameters\n"
        "IPv4\n")
{
        vty->node = LDP_IPV4_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_LDPD, ldp_address_family_ipv6, ldp_address_family_ipv6_cmd,
        "address-family ipv6",
        "Configure Address Family and its parameters\n"
        "IPv6\n")
{
        vty->node = LDP_IPV6_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_LDPD, ldp_exit_address_family, ldp_exit_address_family_cmd,
        "exit-address-family", "Exit from Address Family configuration mode\n")
{
        if (vty->node == LDP_IPV4_NODE || vty->node == LDP_IPV6_NODE)
                vty->node = LDP_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_LDPD, ldp_interface_ifname, ldp_interface_ifname_cmd,
        "interface IFNAME",
        "Enable LDP on an interface and enter interface submode\n"
        "Interface's name\n")
{
        switch (vty->node) {
        case LDP_IPV4_NODE:
                vty->node = LDP_IPV4_IFACE_NODE;
                break;
        case LDP_IPV6_NODE:
                vty->node = LDP_IPV6_IFACE_NODE;
                break;
        default:
                break;
        }

        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_LDPD, ldp_l2vpn_word_type_vpls, ldp_l2vpn_word_type_vpls_cmd,
        "l2vpn WORD type vpls",
        "Configure l2vpn commands\n"
        "L2VPN name\n"
        "L2VPN type\n"
        "Virtual Private LAN Service\n")
{
        vty->node = LDP_L2VPN_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_LDPD, ldp_member_pseudowire_ifname,
        ldp_member_pseudowire_ifname_cmd, "member pseudowire IFNAME",
        "L2VPN member configuration\n"
        "Pseudowire interface\n"
        "Interface's name\n")
{
        vty->node = LDP_PSEUDOWIRE_NODE;
        return CMD_SUCCESS;
}
#endif

DEFUNSH(VTYSH_ISISD, router_isis, router_isis_cmd, "router isis WORD",
        ROUTER_STR
        "ISO IS-IS\n"
        "ISO Routing area tag\n")
{
        vty->node = ISIS_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_FABRICD, router_openfabric, router_openfabric_cmd, "router openfabric WORD",
        ROUTER_STR
        "OpenFabric routing protocol\n"
        "ISO Routing area tag\n")
{
        vty->node = OPENFABRIC_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_RMAP, vtysh_route_map, vtysh_route_map_cmd,
        "route-map WORD <deny|permit> (1-65535)",
        "Create route-map or enter route-map command mode\n"
        "Route map tag\n"
        "Route map denies set operations\n"
        "Route map permits set operations\n"
        "Sequence to insert to/delete from existing route-map entry\n")
{
        vty->node = RMAP_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_PBRD, vtysh_pbr_map, vtysh_pbr_map_cmd,
        "pbr-map PBRMAP seq (1-700)",
        "Create pbr-map or enter pbr-map command mode\n"
        "The name of the PBR MAP\n"
        "Sequence to insert to/delete from existing pbr-map entry\n"
        "Sequence number\n")
{
        vty->node = PBRMAP_NODE;
        return CMD_SUCCESS;
}

#if HAVE_BFDD > 0
DEFUNSH(VTYSH_BFDD, bfd_enter, bfd_enter_cmd, "bfd", "Configure BFD peers\n")
{
        vty->node = BFD_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_BFDD, bfd_peer_enter, bfd_peer_enter_cmd,
        "peer <A.B.C.D|X:X::X:X> [{multihop|local-address <A.B.C.D|X:X::X:X>|interface IFNAME|vrf NAME}]",
        "Configure peer\n"
        "IPv4 peer address\n"
        "IPv6 peer address\n"
        "Configure multihop\n"
        "Configure local address\n"
        "IPv4 local address\n"
        "IPv6 local address\n"
        INTERFACE_STR
        "Configure interface name to use\n"
        "Configure VRF\n"
        "Configure VRF name\n")
{
        vty->node = BFD_PEER_NODE;
        return CMD_SUCCESS;
}
#endif /* HAVE_BFDD */

DEFSH(VTYSH_PBRD, vtysh_no_pbr_map_cmd, "no pbr-map PBRMAP [seq (1-700)]",
        NO_STR
        "Delete pbr-map\n"
        "The name of  the PBR MAP\n"
        "Sequence to delete from existing pbr-map entry\n"
        "Sequence number\n")

DEFUNSH(VTYSH_ALL, vtysh_line_vty, vtysh_line_vty_cmd, "line vty",
        "Configure a terminal line\n"
        "Virtual terminal\n")
{
        vty->node = VTY_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_REALLYALL, vtysh_enable, vtysh_enable_cmd, "enable",
        "Turn on privileged mode command\n")
{
        vty->node = ENABLE_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_REALLYALL, vtysh_disable, vtysh_disable_cmd, "disable",
        "Turn off privileged mode command\n")
{
        if (vty->node == ENABLE_NODE)
                vty->node = VIEW_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_REALLYALL, vtysh_config_terminal, vtysh_config_terminal_cmd,
        "configure [terminal]",
        "Configuration from vty interface\n"
        "Configuration terminal\n")
{
        vty->node = CONFIG_NODE;
        return CMD_SUCCESS;
}

static int vtysh_exit(struct vty *vty)
{
        switch (vty->node) {
        case VIEW_NODE:
        case ENABLE_NODE:
                exit(0);
                break;
        case CONFIG_NODE:
                vty->node = ENABLE_NODE;
                break;
        case INTERFACE_NODE:
        case PW_NODE:
        case VRF_NODE:
        case NH_GROUP_NODE:
        case ZEBRA_NODE:
        case BGP_NODE:
        case RIP_NODE:
        case RIPNG_NODE:
        case OSPF_NODE:
        case OSPF6_NODE:
        case EIGRP_NODE:
        case BABEL_NODE:
        case LDP_NODE:
        case LDP_L2VPN_NODE:
        case ISIS_NODE:
        case OPENFABRIC_NODE:
        case RMAP_NODE:
        case PBRMAP_NODE:
        case VTY_NODE:
        case KEYCHAIN_NODE:
        case BFD_NODE:
        case RPKI_NODE:
                vtysh_execute("end");
                vtysh_execute("configure");
                vty->node = CONFIG_NODE;
                break;
        case BGP_VPNV4_NODE:
        case BGP_VPNV6_NODE:
        case BGP_IPV4_NODE:
        case BGP_IPV4M_NODE:
        case BGP_IPV4L_NODE:
        case BGP_IPV6_NODE:
        case BGP_IPV6M_NODE:
        case BGP_IPV6L_NODE:
        case BGP_FLOWSPECV4_NODE:
        case BGP_FLOWSPECV6_NODE:
        case BGP_VRF_POLICY_NODE:
        case BGP_EVPN_NODE:
        case BGP_VNC_DEFAULTS_NODE:
        case BGP_VNC_NVE_GROUP_NODE:
        case BGP_VNC_L2_GROUP_NODE:
        case BMP_NODE:
                vty->node = BGP_NODE;
                break;
        case BGP_EVPN_VNI_NODE:
                vty->node = BGP_EVPN_NODE;
                break;
        case LDP_IPV4_NODE:
        case LDP_IPV6_NODE:
                vty->node = LDP_NODE;
                break;
        case LDP_IPV4_IFACE_NODE:
                vty->node = LDP_IPV4_NODE;
                break;
        case LDP_IPV6_IFACE_NODE:
                vty->node = LDP_IPV6_NODE;
                break;
        case LDP_PSEUDOWIRE_NODE:
                vty->node = LDP_L2VPN_NODE;
                break;
        case KEYCHAIN_KEY_NODE:
                vty->node = KEYCHAIN_NODE;
                break;
        case LINK_PARAMS_NODE:
                vty->node = INTERFACE_NODE;
                break;
        case BFD_PEER_NODE:
                vty->node = BFD_NODE;
                break;
        default:
                break;
        }
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_REALLYALL, vtysh_exit_all, vtysh_exit_all_cmd, "exit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit(vty);
}

DEFUNSH(VTYSH_ALL, vtysh_quit_all, vtysh_quit_all_cmd, "quit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit_all(self, vty, argc, argv);
}

DEFUNSH(VTYSH_BGPD, exit_address_family, exit_address_family_cmd,
        "exit-address-family", "Exit from Address Family configuration mode\n")
{
        if (vty->node == BGP_IPV4_NODE || vty->node == BGP_IPV4M_NODE
            || vty->node == BGP_IPV4L_NODE || vty->node == BGP_VPNV4_NODE
            || vty->node == BGP_VPNV6_NODE || vty->node == BGP_IPV6_NODE
            || vty->node == BGP_IPV6L_NODE || vty->node == BGP_IPV6M_NODE
            || vty->node == BGP_EVPN_NODE
            || vty->node == BGP_FLOWSPECV4_NODE
            || vty->node == BGP_FLOWSPECV6_NODE)
                vty->node = BGP_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_BGPD, exit_vni, exit_vni_cmd, "exit-vni", "Exit from VNI mode\n")
{
        if (vty->node == BGP_EVPN_VNI_NODE)
                vty->node = BGP_EVPN_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_BGPD, exit_vnc_config, exit_vnc_config_cmd, "exit-vnc",
        "Exit from VNC configuration mode\n")
{
        if (vty->node == BGP_VNC_DEFAULTS_NODE
            || vty->node == BGP_VNC_NVE_GROUP_NODE
            || vty->node == BGP_VNC_L2_GROUP_NODE)
                vty->node = BGP_NODE;
        return CMD_SUCCESS;

}

DEFUNSH(VTYSH_BGPD, rpki_exit, rpki_exit_cmd, "exit",
        "Exit current mode and down to previous mode\n")
{
        vtysh_exit(vty);
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_BGPD, rpki_quit, rpki_quit_cmd, "quit",
        "Exit current mode and down to previous mode\n")
{
        return rpki_exit(self, vty, argc, argv);
}

DEFUNSH(VTYSH_BGPD, bmp_exit, bmp_exit_cmd, "exit",
        "Exit current mode and down to previous mode\n")
{
        vtysh_exit(vty);
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_BGPD, bmp_quit, bmp_quit_cmd, "quit",
        "Exit current mode and down to previous mode\n")
{
        return bmp_exit(self, vty, argc, argv);
}

DEFUNSH(VTYSH_VRF, exit_vrf_config, exit_vrf_config_cmd, "exit-vrf",
        "Exit from VRF configuration mode\n")
{
        if (vty->node == VRF_NODE)
                vty->node = CONFIG_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_BGPD, exit_vrf_policy, exit_vrf_policy_cmd, "exit-vrf-policy",
        "Exit from VRF policy configuration mode\n")
{
        if (vty->node == BGP_VRF_POLICY_NODE)
                vty->node = BGP_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_RIPD, vtysh_exit_ripd, vtysh_exit_ripd_cmd, "exit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit(vty);
}

DEFUNSH(VTYSH_RIPD, vtysh_quit_ripd, vtysh_quit_ripd_cmd, "quit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit_ripd(self, vty, argc, argv);
}

DEFUNSH(VTYSH_RIPNGD, vtysh_exit_ripngd, vtysh_exit_ripngd_cmd, "exit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit(vty);
}

DEFUNSH(VTYSH_RIPNGD, vtysh_quit_ripngd, vtysh_quit_ripngd_cmd, "quit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit_ripngd(self, vty, argc, argv);
}

DEFUNSH(VTYSH_RMAP, vtysh_exit_rmap, vtysh_exit_rmap_cmd, "exit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit(vty);
}

DEFUNSH(VTYSH_RMAP, vtysh_quit_rmap, vtysh_quit_rmap_cmd, "quit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit_rmap(self, vty, argc, argv);
}

DEFUNSH(VTYSH_PBRD, vtysh_exit_pbr_map, vtysh_exit_pbr_map_cmd, "exit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit(vty);
}

DEFUNSH(VTYSH_PBRD, vtysh_quit_pbr_map, vtysh_quit_pbr_map_cmd, "quit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit_rmap(self, vty, argc, argv);
}

DEFUNSH(VTYSH_BGPD, vtysh_exit_bgpd, vtysh_exit_bgpd_cmd, "exit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit(vty);
}

DEFUNSH(VTYSH_BGPD, vtysh_quit_bgpd, vtysh_quit_bgpd_cmd, "quit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit_bgpd(self, vty, argc, argv);
}

DEFUNSH(VTYSH_OSPFD, vtysh_exit_ospfd, vtysh_exit_ospfd_cmd, "exit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit(vty);
}

DEFUNSH(VTYSH_OSPFD, vtysh_quit_ospfd, vtysh_quit_ospfd_cmd, "quit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit_ospfd(self, vty, argc, argv);
}

DEFUNSH(VTYSH_EIGRPD, vtysh_exit_eigrpd, vtysh_exit_eigrpd_cmd, "exit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit(vty);
}

DEFUNSH(VTYSH_EIGRPD, vtysh_quit_eigrpd, vtysh_quit_eigrpd_cmd, "quit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit(vty);
}

DEFUNSH(VTYSH_EIGRPD, vtysh_exit_babeld, vtysh_exit_babeld_cmd, "exit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit(vty);
}

DEFUNSH(VTYSH_BABELD, vtysh_quit_babeld, vtysh_quit_babeld_cmd, "quit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit(vty);
}

DEFUNSH(VTYSH_OSPF6D, vtysh_exit_ospf6d, vtysh_exit_ospf6d_cmd, "exit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit(vty);
}

DEFUNSH(VTYSH_OSPF6D, vtysh_quit_ospf6d, vtysh_quit_ospf6d_cmd, "quit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit_ospf6d(self, vty, argc, argv);
}

#if defined(HAVE_LDPD)
DEFUNSH(VTYSH_LDPD, vtysh_exit_ldpd, vtysh_exit_ldpd_cmd, "exit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit(vty);
}

ALIAS(vtysh_exit_ldpd, vtysh_quit_ldpd_cmd, "quit",
      "Exit current mode and down to previous mode\n")
#endif

DEFUNSH(VTYSH_ISISD, vtysh_exit_isisd, vtysh_exit_isisd_cmd, "exit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit(vty);
}

DEFUNSH(VTYSH_ISISD, vtysh_quit_isisd, vtysh_quit_isisd_cmd, "quit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit_isisd(self, vty, argc, argv);
}

#if HAVE_BFDD > 0
DEFUNSH(VTYSH_BFDD, vtysh_exit_bfdd, vtysh_exit_bfdd_cmd, "exit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit(vty);
}

ALIAS(vtysh_exit_bfdd, vtysh_quit_bfdd_cmd, "quit",
      "Exit current mode and down to previous mode\n")
#endif

DEFUNSH(VTYSH_FABRICD, vtysh_exit_fabricd, vtysh_exit_fabricd_cmd, "exit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit(vty);
}

DEFUNSH(VTYSH_FABRICD, vtysh_quit_fabricd, vtysh_quit_fabricd_cmd, "quit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit_fabricd(self, vty, argc, argv);
}

DEFUNSH(VTYSH_ALL, vtysh_exit_line_vty, vtysh_exit_line_vty_cmd, "exit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit(vty);
}

DEFUNSH(VTYSH_ALL, vtysh_quit_line_vty, vtysh_quit_line_vty_cmd, "quit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit_line_vty(self, vty, argc, argv);
}

DEFUNSH(VTYSH_INTERFACE, vtysh_interface, vtysh_interface_cmd,
        "interface IFNAME [vrf NAME]",
        "Select an interface to configure\n"
        "Interface's name\n" VRF_CMD_HELP_STR)
{
        vty->node = INTERFACE_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_ZEBRA, vtysh_pseudowire, vtysh_pseudowire_cmd,
        "pseudowire IFNAME",
        "Static pseudowire configuration\n"
        "Pseudowire name\n")
{
        vty->node = PW_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_PBRD | VTYSH_SHARPD, vtysh_nexthop_group, vtysh_nexthop_group_cmd,
        "nexthop-group NHGNAME",
        "Nexthop Group configuration\n"
        "Name of the Nexthop Group\n")
{
        vty->node = NH_GROUP_NODE;
        return CMD_SUCCESS;
}

DEFSH(VTYSH_PBRD | VTYSH_SHARPD, vtysh_no_nexthop_group_cmd,
      "no nexthop-group NHGNAME",
      NO_STR
      "Nexthop Group Configuration\n"
      "Name of the Nexthop Group\n")

DEFUNSH(VTYSH_VRF, vtysh_vrf, vtysh_vrf_cmd, "vrf NAME",
        "Select a VRF to configure\n"
        "VRF's name\n")
{
        vty->node = VRF_NODE;
        return CMD_SUCCESS;
}

DEFSH(VTYSH_ZEBRA, vtysh_vrf_netns_cmd,
      "netns NAME",
      "Attach VRF to a Namespace\n"
      "The file name in " NS_RUN_DIR ", or a full pathname\n")

DEFSH(VTYSH_ZEBRA, vtysh_no_vrf_netns_cmd,
      "no netns [NAME]",
      NO_STR
      "Detach VRF from a Namespace\n"
      "The file name in " NS_RUN_DIR ", or a full pathname\n")

DEFUNSH(VTYSH_VRF, vtysh_exit_vrf, vtysh_exit_vrf_cmd, "exit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit(vty);
}

DEFUNSH(VTYSH_VRF, vtysh_quit_vrf, vtysh_quit_vrf_cmd, "quit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit_vrf(self, vty, argc, argv);
}

DEFUNSH(VTYSH_PBRD | VTYSH_SHARPD, vtysh_exit_nexthop_group, vtysh_exit_nexthop_group_cmd,
        "exit", "Exit current mode and down to previous mode\n")
{
        return vtysh_exit(vty);
}

DEFUNSH(VTYSH_PBRD | VTYSH_SHARPD, vtysh_quit_nexthop_group, vtysh_quit_nexthop_group_cmd,
        "quit", "Exit current mode and down to previous mode\n")
{
        return vtysh_exit_nexthop_group(self, vty, argc, argv);
}

DEFUNSH(VTYSH_INTERFACE, vtysh_exit_interface, vtysh_exit_interface_cmd, "exit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit(vty);
}

DEFUNSH(VTYSH_INTERFACE, vtysh_quit_interface, vtysh_quit_interface_cmd, "quit",
        "Exit current mode and down to previous mode\n")
{
        return vtysh_exit_interface(self, vty, argc, argv);
}

DEFUN (vtysh_show_poll,
       vtysh_show_poll_cmd,
       "show thread poll",
       SHOW_STR
       "Thread information\n"
       "Thread Poll Information\n")
{
        unsigned int i;
        int ret = CMD_SUCCESS;
        char line[100];

        snprintf(line, sizeof(line), "do show thread poll\n");
        for (i = 0; i < array_size(vtysh_client); i++)
                if (vtysh_client[i].fd >= 0) {
                        vty_out(vty, "Thread statistics for %s:\n",
                                vtysh_client[i].name);
                        ret = vtysh_client_execute(&vtysh_client[i], line);
                        vty_out(vty, "\n");
                }
        return ret;
}

DEFUN (vtysh_show_thread,
       vtysh_show_thread_cmd,
       "show thread cpu [FILTER]",
       SHOW_STR
       "Thread information\n"
       "Thread CPU usage\n"
       "Display filter (rwtexb)\n")
{
        unsigned int i;
        int idx = 0;
        int ret = CMD_SUCCESS;
        char line[100];

        const char *filter =
                argv_find(argv, argc, "FILTER", &idx) ? argv[idx]->arg : "";

        snprintf(line, sizeof(line), "do show thread cpu %s\n", filter);
        for (i = 0; i < array_size(vtysh_client); i++)
                if (vtysh_client[i].fd >= 0) {
                        vty_out(vty, "Thread statistics for %s:\n",
                                vtysh_client[i].name);
                        ret = vtysh_client_execute(&vtysh_client[i], line);
                        vty_out(vty, "\n");
                }
        return ret;
}

DEFUN (vtysh_show_work_queues,
       vtysh_show_work_queues_cmd,
       "show work-queues",
       SHOW_STR
       "Work Queue information\n")
{
        unsigned int i;
        int ret = CMD_SUCCESS;
        char line[] = "do show work-queues\n";

        for (i = 0; i < array_size(vtysh_client); i++)
                if (vtysh_client[i].fd >= 0) {
                        vty_out(vty, "Work queue statistics for %s:\n",
                                vtysh_client[i].name);
                        ret = vtysh_client_execute(&vtysh_client[i], line);
                        vty_out(vty, "\n");
                }

        return ret;
}

DEFUN (vtysh_show_work_queues_daemon,
       vtysh_show_work_queues_daemon_cmd,
       "show work-queues " DAEMONS_LIST,
       SHOW_STR
       "Work Queue information\n"
       DAEMONS_STR)
{
        int idx_protocol = 2;

        return vtysh_client_execute_name(argv[idx_protocol]->text,
                                         "show work-queues\n");
}

DEFUNSH(VTYSH_ZEBRA, vtysh_link_params, vtysh_link_params_cmd, "link-params",
        LINK_PARAMS_STR)
{
        vty->node = LINK_PARAMS_NODE;
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_ZEBRA, exit_link_params, exit_link_params_cmd, "exit-link-params",
        "Exit from Link Params configuration node\n")
{
        if (vty->node == LINK_PARAMS_NODE)
                vty->node = INTERFACE_NODE;
        return CMD_SUCCESS;
}

static int show_per_daemon(const char *line, const char *headline)
{
        unsigned int i;
        int ret = CMD_SUCCESS;

        for (i = 0; i < array_size(vtysh_client); i++)
                if (vtysh_client[i].fd >= 0) {
                        vty_out(vty, headline, vtysh_client[i].name);
                        ret = vtysh_client_execute(&vtysh_client[i], line);
                        vty_out(vty, "\n");
                }

        return ret;
}

DEFUNSH_HIDDEN (0x00,
                vtysh_debug_all,
                vtysh_debug_all_cmd,
                "[no] debug all",
                NO_STR
                DEBUG_STR
                "Toggle all debugs on or off\n")
{
        return CMD_SUCCESS;
}

DEFUN (vtysh_show_debugging,
       vtysh_show_debugging_cmd,
       "show debugging",
       SHOW_STR
       DEBUG_STR)
{
        return show_per_daemon("do show debugging\n", "");
}

DEFUN (vtysh_show_debugging_hashtable,
       vtysh_show_debugging_hashtable_cmd,
       "show debugging hashtable [statistics]",
       SHOW_STR
       DEBUG_STR
       "Statistics about hash tables\n"
       "Statistics about hash tables\n")
{
        vty_out(vty, "\n");
        vty_out(vty,
                "Load factor (LF) - average number of elements across all buckets\n");
        vty_out(vty,
                "Full load factor (FLF) - average number of elements across full buckets\n\n");
        vty_out(vty,
                "Standard deviation (SD) is calculated for both the LF and FLF\n");
        vty_out(vty,
                "and indicates the typical deviation of bucket chain length\n");
        vty_out(vty, "from the value in the corresponding load factor.\n\n");

        return show_per_daemon("do show debugging hashtable\n",
                               "Hashtable statistics for %s:\n");
}

DEFUN (vtysh_show_error_code,
       vtysh_show_error_code_cmd,
       "show error <(1-4294967296)|all> [json]",
       SHOW_STR
       "Information on errors\n"
       "Error code to get info about\n"
       "Information on all errors\n"
       JSON_STR)
{
        uint32_t arg = 0;

        if (!strmatch(argv[2]->text, "all"))
                arg = strtoul(argv[2]->arg, NULL, 10);

        /* If it's not a shared code, send it to all the daemons */
        if (arg < LIB_FERR_START || arg > LIB_FERR_END) {
                char *fcmd = argv_concat(argv, argc, 0);
                char cmd[256];

                snprintf(cmd, sizeof(cmd), "do %s", fcmd);
                show_per_daemon(cmd, "");
                XFREE(MTYPE_TMP, fcmd);
                /* Otherwise, print it ourselves to avoid duplication */
        } else {
                bool json = strmatch(argv[argc - 1]->text, "json");

                if (!strmatch(argv[2]->text, "all"))
                        arg = strtoul(argv[2]->arg, NULL, 10);

                log_ref_display(vty, arg, json);
        }

        return CMD_SUCCESS;
}

/* Memory */
DEFUN (vtysh_show_memory,
       vtysh_show_memory_cmd,
       "show memory",
       SHOW_STR
       "Memory statistics\n")
{
        return show_per_daemon("do show memory\n", "Memory statistics for %s:\n");
}

DEFUN (vtysh_show_modules,
       vtysh_show_modules_cmd,
       "show modules",
       SHOW_STR
       "Loaded modules\n")
{
        return show_per_daemon("do show modules\n",
                               "Module information for %s:\n");
}

/* Logging commands. */
DEFUN (vtysh_show_logging,
       vtysh_show_logging_cmd,
       "show logging",
       SHOW_STR
       "Show current logging configuration\n")
{
        return show_per_daemon("do show logging\n",
                               "Logging configuration for %s:\n");
}

DEFUNSH(VTYSH_ALL, vtysh_log_stdout, vtysh_log_stdout_cmd, "log stdout",
        "Logging control\n"
        "Set stdout logging level\n")
{
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_ALL, vtysh_log_stdout_level, vtysh_log_stdout_level_cmd,
        "log stdout <emergencies|alerts|critical|errors|warnings|notifications|informational|debugging>",
        "Logging control\n"
        "Set stdout logging level\n" LOG_LEVEL_DESC)
{
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_ALL, no_vtysh_log_stdout, no_vtysh_log_stdout_cmd,
        "no log stdout [LEVEL]", NO_STR
        "Logging control\n"
        "Cancel logging to stdout\n"
        "Logging level\n")
{
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_ALL, vtysh_log_file, vtysh_log_file_cmd, "log file FILENAME",
        "Logging control\n"
        "Logging to file\n"
        "Logging filename\n")
{
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_ALL, vtysh_log_file_level, vtysh_log_file_level_cmd,
        "log file FILENAME <emergencies|alerts|critical|errors|warnings|notifications|informational|debugging>",
        "Logging control\n"
        "Logging to file\n"
        "Logging filename\n" LOG_LEVEL_DESC)
{
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_ALL, no_vtysh_log_file, no_vtysh_log_file_cmd,
        "no log file [FILENAME [LEVEL]]", NO_STR
        "Logging control\n"
        "Cancel logging to file\n"
        "Logging file name\n"
        "Logging level\n")
{
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_ALL, vtysh_log_monitor, vtysh_log_monitor_cmd,
        "log monitor [<emergencies|alerts|critical|errors|warnings|notifications|informational|debugging>]",
        "Logging control\n"
        "Set terminal line (monitor) logging level\n" LOG_LEVEL_DESC)
{
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_ALL, no_vtysh_log_monitor, no_vtysh_log_monitor_cmd,
        "no log monitor [LEVEL]", NO_STR
        "Logging control\n"
        "Disable terminal line (monitor) logging\n"
        "Logging level\n")
{
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_ALL, vtysh_log_syslog, vtysh_log_syslog_cmd,
        "log syslog [<emergencies|alerts|critical|errors|warnings|notifications|informational|debugging>]",
        "Logging control\n"
        "Set syslog logging level\n" LOG_LEVEL_DESC)
{
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_ALL, no_vtysh_log_syslog, no_vtysh_log_syslog_cmd,
        "no log syslog [<emergencies|alerts|critical|errors|warnings|notifications|informational|debugging>]",
        NO_STR
        "Logging control\n"
        "Cancel logging to syslog\n"
        LOG_LEVEL_DESC)
{
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_ALL, vtysh_log_facility, vtysh_log_facility_cmd,
        "log facility <kern|user|mail|daemon|auth|syslog|lpr|news|uucp|cron|local0|local1|local2|local3|local4|local5|local6|local7>",
        "Logging control\n"
        "Facility parameter for syslog messages\n" LOG_FACILITY_DESC)
{
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_ALL, no_vtysh_log_facility, no_vtysh_log_facility_cmd,
        "no log facility [FACILITY]", NO_STR
        "Logging control\n"
        "Reset syslog facility to default (daemon)\n"
        "Syslog facility\n")
{
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_ALL, vtysh_log_record_priority, vtysh_log_record_priority_cmd,
        "log record-priority",
        "Logging control\n"
        "Log the priority of the message within the message\n")
{
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_ALL, no_vtysh_log_record_priority,
        no_vtysh_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")
{
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_ALL, vtysh_log_timestamp_precision,
        vtysh_log_timestamp_precision_cmd, "log timestamp precision (0-6)",
        "Logging control\n"
        "Timestamp configuration\n"
        "Set the timestamp precision\n"
        "Number of subsecond digits\n")
{
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_ALL, vtysh_debug_memstats,
        vtysh_debug_memstats_cmd, "[no] debug memstats-at-exit",
        NO_STR
        "Debug\n"
        "Print memory statistics at exit\n")
{
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_ALL, no_vtysh_log_timestamp_precision,
        no_vtysh_log_timestamp_precision_cmd, "no log timestamp precision",
        NO_STR
        "Logging control\n"
        "Timestamp configuration\n"
        "Reset the timestamp precision to the default value of 0\n")
{
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_ALL, vtysh_service_password_encrypt,
        vtysh_service_password_encrypt_cmd, "service password-encryption",
        "Set up miscellaneous service\n"
        "Enable encrypted passwords\n")
{
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_ALL, no_vtysh_service_password_encrypt,
        no_vtysh_service_password_encrypt_cmd, "no service password-encryption",
        NO_STR
        "Set up miscellaneous service\n"
        "Enable encrypted passwords\n")
{
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_ALL, vtysh_config_password, vtysh_password_cmd,
        "password [(8-8)] LINE",
        "Modify the terminal connection password\n"
        "Specifies a HIDDEN password will follow\n"
        "The password string\n")
{
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_ALL, no_vtysh_config_password, no_vtysh_password_cmd,
        "no password", NO_STR
        "Modify the terminal connection password\n")
{
        vty_out(vty, NO_PASSWD_CMD_WARNING);

        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_ALL, vtysh_config_enable_password, vtysh_enable_password_cmd,
        "enable password [(8-8)] LINE",
        "Modify enable password parameters\n"
        "Assign the privileged level password\n"
        "Specifies a HIDDEN password will follow\n"
        "The 'enable' password string\n")
{
        return CMD_SUCCESS;
}

DEFUNSH(VTYSH_ALL, no_vtysh_config_enable_password,
        no_vtysh_enable_password_cmd, "no enable password", NO_STR
        "Modify enable password parameters\n"
        "Assign the privileged level password\n")
{
        vty_out(vty, NO_PASSWD_CMD_WARNING);

        return CMD_SUCCESS;
}

/* Log filter */
DEFUN (vtysh_log_filter,
       vtysh_log_filter_cmd,
       "[no] log-filter WORD ["DAEMONS_LIST"]",
       NO_STR
       FILTER_LOG_STR
       "String to filter by\n"
       DAEMONS_STR)
{
        char *filter = NULL;
        char *daemon = NULL;
        int found = 0;
        int idx = 0;
        int daemon_idx = 2;
        int total_len = 0;
        int len = 0;

        char line[ZLOG_FILTER_LENGTH_MAX + 20];

        found = argv_find(argv, argc, "no", &idx);
        if (found == 1) {
                len = snprintf(line, sizeof(line), "no log-filter");
                daemon_idx += 1;
        } else
                len = snprintf(line, sizeof(line), "log-filter");

        total_len += len;

        idx = 1;
        found = argv_find(argv, argc, "WORD", &idx);
        if (found != 1) {
                vty_out(vty, "%% No filter string given\n");
                return CMD_WARNING;
        }
        filter = argv[idx]->arg;

        if (strnlen(filter, ZLOG_FILTER_LENGTH_MAX + 1)
            > ZLOG_FILTER_LENGTH_MAX) {
                vty_out(vty, "%% Filter is too long\n");
                return CMD_WARNING;
        }

        len = snprintf(line + total_len, sizeof(line) - total_len, " %s\n",
                       filter);

        if ((len < 0) || (size_t)(total_len + len) > sizeof(line)) {
                vty_out(vty, "%% Error buffering filter to daemons\n");
                return CMD_ERR_INCOMPLETE;
        }

        if (argc >= (daemon_idx + 1))
                daemon = argv[daemon_idx]->text;

        if (daemon != NULL) {
                vty_out(vty, "Applying log filter change to %s:\n", daemon);
                return vtysh_client_execute_name(daemon, line);
        } else
                return show_per_daemon(line,
                                       "Applying log filter change to %s:\n");
}

/* Clear log filters */
DEFUN (vtysh_log_filter_clear,
       vtysh_log_filter_clear_cmd,
       "log-filter clear ["DAEMONS_LIST"]",
       FILTER_LOG_STR
       CLEAR_STR
       DAEMONS_STR)
{
        char *daemon = NULL;
        int daemon_idx = 2;

        char line[] = "clear log-filter\n";

        if (argc >= (daemon_idx + 1))
                daemon = argv[daemon_idx]->text;

        if (daemon != NULL) {
                vty_out(vty, "Clearing all filters applied to %s:\n", daemon);
                return vtysh_client_execute_name(daemon, line);
        } else
                return show_per_daemon(line,
                                       "Clearing all filters applied to %s:\n");
}

/* Show log filter */
DEFUN (vtysh_show_log_filter,
       vtysh_show_log_filter_cmd,
       "show log-filter",
       SHOW_STR
       FILTER_LOG_STR)
{
        char line[] = "do show log-filter\n";

        return show_per_daemon(line, "Log filters applied to %s:\n");
}

DEFUN (vtysh_write_terminal,
       vtysh_write_terminal_cmd,
       "write terminal ["DAEMONS_LIST"]",
       "Write running configuration to memory, network, or terminal\n"
       "Write to terminal\n"
       DAEMONS_STR)
{
        unsigned int i;
        char line[] = "do write terminal\n";

        vty_out(vty, "Building configuration...\n");
        vty_out(vty, "\nCurrent configuration:\n");
        vty_out(vty, "!\n");

        for (i = 0; i < array_size(vtysh_client); i++)
                if ((argc < 3)
                    || (strmatch(vtysh_client[i].name, argv[2]->text)))
                        vtysh_client_config(&vtysh_client[i], line);

        /* Integrate vtysh specific configuration. */
        vty_open_pager(vty);
        vtysh_config_write();
        vtysh_config_dump();
        vty_close_pager(vty);
        vty_out(vty, "end\n");

        return CMD_SUCCESS;
}

DEFUN (vtysh_show_running_config,
       vtysh_show_running_config_cmd,
       "show running-config ["DAEMONS_LIST"]",
       SHOW_STR
       "Current operating configuration\n"
       DAEMONS_STR)
{
        return vtysh_write_terminal(self, vty, argc, argv);
}

DEFUN (vtysh_integrated_config,
       vtysh_integrated_config_cmd,
       "service integrated-vtysh-config",
       "Set up miscellaneous service\n"
       "Write configuration into integrated file\n")
{
        vtysh_write_integrated = WRITE_INTEGRATED_YES;
        return CMD_SUCCESS;
}

DEFUN (no_vtysh_integrated_config,
       no_vtysh_integrated_config_cmd,
       "no service integrated-vtysh-config",
       NO_STR
       "Set up miscellaneous service\n"
       "Write configuration into integrated file\n")
{
        vtysh_write_integrated = WRITE_INTEGRATED_NO;
        return CMD_SUCCESS;
}

static void backup_config_file(const char *fbackup)
{
        char *integrate_sav = NULL;

        size_t integrate_sav_sz = strlen(fbackup) + strlen(CONF_BACKUP_EXT) + 1;
        integrate_sav = malloc(integrate_sav_sz);
        strlcpy(integrate_sav, fbackup, integrate_sav_sz);
        strlcat(integrate_sav, CONF_BACKUP_EXT, integrate_sav_sz);

        /* Move current configuration file to backup config file. */
        if (unlink(integrate_sav) != 0) {
                vty_out(vty, "Warning: %s unlink failed\n", integrate_sav);
        }
        if (rename(fbackup, integrate_sav) != 0) {
                vty_out(vty, "Error renaming %s to %s\n", fbackup,
                        integrate_sav);
        }
        free(integrate_sav);
}

int vtysh_write_config_integrated(void)
{
        unsigned int i;
        char line[] = "do write terminal\n";
        FILE *fp;
        int fd;
#ifdef FRR_USER
        struct passwd *pwentry;
#endif
#ifdef FRR_GROUP
        struct group *grentry;
#endif
        uid_t uid = -1;
        gid_t gid = -1;
        struct stat st;
        int err = 0;

        vty_out(vty, "Building Configuration...\n");

        backup_config_file(frr_config);
        fp = fopen(frr_config, "w");
        if (fp == NULL) {
                vty_out(vty,
                        "%% Error: failed to open configuration file %s: %s\n",
                        frr_config, safe_strerror(errno));
                return CMD_WARNING_CONFIG_FAILED;
        }
        fd = fileno(fp);

        for (i = 0; i < array_size(vtysh_client); i++)
                vtysh_client_config(&vtysh_client[i], line);

        vtysh_config_write();
        vty->of_saved = vty->of;
        vty->of = fp;
        vtysh_config_dump();
        vty->of = vty->of_saved;

        if (fchmod(fd, CONFIGFILE_MASK) != 0) {
                printf("%% Warning: can't chmod configuration file %s: %s\n",
                       frr_config, safe_strerror(errno));
                err++;
        }

#ifdef FRR_USER
        pwentry = getpwnam(FRR_USER);
        if (pwentry)
                uid = pwentry->pw_uid;
        else {
                printf("%% Warning: could not look up user \"%s\"\n", FRR_USER);
                err++;
        }
#endif
#ifdef FRR_GROUP
        grentry = getgrnam(FRR_GROUP);
        if (grentry)
                gid = grentry->gr_gid;
        else {
                printf("%% Warning: could not look up group \"%s\"\n",
                       FRR_GROUP);
                err++;
        }
#endif

        if (!fstat(fd, &st)) {
                if (st.st_uid == uid)
                        uid = -1;
                if (st.st_gid == gid)
                        gid = -1;
                if ((uid != (uid_t)-1 || gid != (gid_t)-1)
                    && fchown(fd, uid, gid)) {
                        printf("%% Warning: can't chown configuration file %s: %s\n",
                               frr_config, safe_strerror(errno));
                        err++;
                }
        } else {
                printf("%% Warning: stat() failed on %s: %s\n", frr_config,
                       safe_strerror(errno));
                err++;
        }

        fclose(fp);

        printf("Integrated configuration saved to %s\n", frr_config);
        if (err)
                return CMD_WARNING;

        printf("[OK]\n");
        return CMD_SUCCESS;
}

static bool want_config_integrated(void)
{
        struct stat s;

        switch (vtysh_write_integrated) {
        case WRITE_INTEGRATED_UNSPECIFIED:
                if (stat(frr_config, &s) && errno == ENOENT)
                        return false;
                return true;
        case WRITE_INTEGRATED_NO:
                return false;
        case WRITE_INTEGRATED_YES:
                return true;
        }
        return true;
}

DEFUN (vtysh_write_memory,
       vtysh_write_memory_cmd,
       "write [<memory|file>]",
       "Write running configuration to memory, network, or terminal\n"
       "Write configuration to the file (same as write file)\n"
       "Write configuration to the file (same as write memory)\n")
{
        int ret = CMD_SUCCESS;
        char line[] = "do write memory\n";
        unsigned int i;

        vty_out(vty, "Note: this version of vtysh never writes vtysh.conf\n");

        /* If integrated frr.conf explicitely set. */
        if (want_config_integrated()) {
                ret = CMD_WARNING_CONFIG_FAILED;

                /* first attempt to use watchfrr if it's available */
                bool used_watchfrr = false;

                for (i = 0; i < array_size(vtysh_client); i++)
                        if (vtysh_client[i].flag == VTYSH_WATCHFRR)
                                break;
                if (i < array_size(vtysh_client) && vtysh_client[i].fd != -1) {
                        used_watchfrr = true;
                        ret = vtysh_client_execute(&vtysh_client[i],
                                                   "do write integrated");
                }

                /*
                 * If we didn't use watchfrr, fallback to writing the config
                 * ourselves
                 */
                if (!used_watchfrr) {
                        printf("\nWarning: attempting direct configuration write without "
                               "watchfrr.\nFile permissions and ownership may be "
                               "incorrect, or write may fail.\n\n");
                        ret = vtysh_write_config_integrated();
                }
                return ret;
        }

        vty_out(vty, "Building Configuration...\n");

        for (i = 0; i < array_size(vtysh_client); i++)
                ret = vtysh_client_execute(&vtysh_client[i], line);

        return ret;
}

DEFUN (vtysh_copy_running_config,
       vtysh_copy_running_config_cmd,
       "copy running-config startup-config",
       "Copy from one file to another\n"
       "Copy from current system configuration\n"
       "Copy to startup configuration\n")
{
        return vtysh_write_memory(self, vty, argc, argv);
}

DEFUN (vtysh_terminal_paginate,
       vtysh_terminal_paginate_cmd,
       "[no] terminal paginate",
       NO_STR
       "Set terminal line parameters\n"
       "Use pager for output scrolling\n")
{
        free(vtysh_pager_name);
        vtysh_pager_name = NULL;

        if (strcmp(argv[0]->text, "no"))
                vtysh_pager_envdef(true);
        return CMD_SUCCESS;
}

DEFUN (vtysh_terminal_length,
       vtysh_terminal_length_cmd,
       "[no] terminal length (0-4294967295)",
       NO_STR
       "Set terminal line parameters\n"
       "Set number of lines on a screen\n"
       "Number of lines on screen (0 for no pausing, nonzero to use pager)\n")
{
        int idx_number = 2;
        unsigned long lines;

        free(vtysh_pager_name);
        vtysh_pager_name = NULL;

        if (!strcmp(argv[0]->text, "no") || !strcmp(argv[1]->text, "no")) {
                /* "terminal no length" = use VTYSH_PAGER */
                vtysh_pager_envdef(true);
                return CMD_SUCCESS;
        }

        lines = strtoul(argv[idx_number]->arg, NULL, 10);
        if (lines != 0) {
                vty_out(vty,
                        "%% The \"terminal length\" command is deprecated and its value is ignored.\n"
                        "%% Please use \"terminal paginate\" instead with OS TTY length handling.\n");
                vtysh_pager_envdef(true);
        }

        return CMD_SUCCESS;
}

ALIAS_DEPRECATED(vtysh_terminal_length,
       vtysh_terminal_no_length_cmd,
       "terminal no length",
       "Set terminal line parameters\n"
       NO_STR
       "Set number of lines on a screen\n")

DEFUN (vtysh_show_daemons,
       vtysh_show_daemons_cmd,
       "show daemons",
       SHOW_STR
       "Show list of running daemons\n")
{
        unsigned int i;

        for (i = 0; i < array_size(vtysh_client); i++)
                if (vtysh_client[i].fd >= 0)
                        vty_out(vty, " %s", vtysh_client[i].name);
        vty_out(vty, "\n");

        return CMD_SUCCESS;
}

/* Execute command in child process. */
static void execute_command(const char *command, int argc, const char *arg1,
                            const char *arg2)
{
        pid_t pid;
        int status;

        /* Call fork(). */
        pid = fork();

        if (pid < 0) {
                /* Failure of fork(). */
                fprintf(stderr, "Can't fork: %s\n", safe_strerror(errno));
                exit(1);
        } else if (pid == 0) {
                /* This is child process. */
                switch (argc) {
                case 0:
                        execlp(command, command, (const char *)NULL);
                        break;
                case 1:
                        execlp(command, command, arg1, (const char *)NULL);
                        break;
                case 2:
                        execlp(command, command, arg1, arg2,
                               (const char *)NULL);
                        break;
                }

                /* When execlp suceed, this part is not executed. */
                fprintf(stderr, "Can't execute %s: %s\n", command,
                        safe_strerror(errno));
                exit(1);
        } else {
                /* This is parent. */
                execute_flag = 1;
                wait4(pid, &status, 0, NULL);
                execute_flag = 0;
        }
}

DEFUN (vtysh_ping,
       vtysh_ping_cmd,
       "ping WORD",
       "Send echo messages\n"
       "Ping destination address or hostname\n")
{
        int idx = 1;

        argv_find(argv, argc, "WORD", &idx);
        execute_command("ping", 1, argv[idx]->arg, NULL);
        return CMD_SUCCESS;
}

ALIAS(vtysh_ping, vtysh_ping_ip_cmd, "ping ip WORD",
      "Send echo messages\n"
      "IP echo\n"
      "Ping destination address or hostname\n")

DEFUN (vtysh_traceroute,
       vtysh_traceroute_cmd,
       "traceroute WORD",
       "Trace route to destination\n"
       "Trace route to destination address or hostname\n")
{
        int idx = 1;

        argv_find(argv, argc, "WORD", &idx);
        execute_command("traceroute", 1, argv[idx]->arg, NULL);
        return CMD_SUCCESS;
}

ALIAS(vtysh_traceroute, vtysh_traceroute_ip_cmd, "traceroute ip WORD",
      "Trace route to destination\n"
      "IP trace\n"
      "Trace route to destination address or hostname\n")

DEFUN (vtysh_mtrace,
       vtysh_mtrace_cmd,
       "mtrace WORD [WORD]",
       "Multicast trace route to multicast source\n"
       "Multicast trace route to multicast source address\n"
       "Multicast trace route for multicast group address\n")
{
        if (argc == 2)
                execute_command("mtracebis", 1, argv[1]->arg, NULL);
        else
                execute_command("mtracebis", 2, argv[1]->arg, argv[2]->arg);
        return CMD_SUCCESS;
}

DEFUN (vtysh_ping6,
       vtysh_ping6_cmd,
       "ping ipv6 WORD",
       "Send echo messages\n"
       "IPv6 echo\n"
       "Ping destination address or hostname\n")
{
        execute_command("ping6", 1, argv[2]->arg, NULL);
        return CMD_SUCCESS;
}

DEFUN (vtysh_traceroute6,
       vtysh_traceroute6_cmd,
       "traceroute ipv6 WORD",
       "Trace route to destination\n"
       "IPv6 trace\n"
       "Trace route to destination address or hostname\n")
{
        execute_command("traceroute6", 1, argv[2]->arg, NULL);
        return CMD_SUCCESS;
}

#if defined(HAVE_SHELL_ACCESS)
DEFUN (vtysh_telnet,
       vtysh_telnet_cmd,
       "telnet WORD",
       "Open a telnet connection\n"
       "IP address or hostname of a remote system\n")
{
        execute_command("telnet", 1, argv[1]->arg, NULL);
        return CMD_SUCCESS;
}

DEFUN (vtysh_telnet_port,
       vtysh_telnet_port_cmd,
       "telnet WORD PORT",
       "Open a telnet connection\n"
       "IP address or hostname of a remote system\n"
       "TCP Port number\n")
{
        execute_command("telnet", 2, argv[1]->arg, argv[2]->arg);
        return CMD_SUCCESS;
}

DEFUN (vtysh_ssh,
       vtysh_ssh_cmd,
       "ssh WORD",
       "Open an ssh connection\n"
       "[user@]host\n")
{
        execute_command("ssh", 1, argv[1]->arg, NULL);
        return CMD_SUCCESS;
}

DEFUN (vtysh_start_shell,
       vtysh_start_shell_cmd,
       "start-shell",
       "Start UNIX shell\n")
{
        execute_command("sh", 0, NULL, NULL);
        return CMD_SUCCESS;
}

DEFUN (vtysh_start_bash,
       vtysh_start_bash_cmd,
       "start-shell bash",
       "Start UNIX shell\n"
       "Start bash\n")
{
        execute_command("bash", 0, NULL, NULL);
        return CMD_SUCCESS;
}

DEFUN (vtysh_start_zsh,
       vtysh_start_zsh_cmd,
       "start-shell zsh",
       "Start UNIX shell\n"
       "Start Z shell\n")
{
        execute_command("zsh", 0, NULL, NULL);
        return CMD_SUCCESS;
}
#endif

DEFUN (config_list,
       config_list_cmd,
       "list [permutations]",
       "Print command list\n"
       "Print all possible command permutations\n")
{
        return cmd_list_cmds(vty, argc == 2);
}

DEFUN (vtysh_output_file,
       vtysh_output_file_cmd,
       "output file FILE",
       "Direct vtysh output to file\n"
       "Direct vtysh output to file\n"
       "Path to dump output to\n")
{
        const char *path = argv[argc - 1]->arg;
        vty->of = fopen(path, "a");
        if (!vty->of) {
                vty_out(vty, "Failed to open file '%s': %s\n", path,
                        safe_strerror(errno));
                vty->of = stdout;
        }
        return CMD_SUCCESS;
}

DEFUN (no_vtysh_output_file,
       no_vtysh_output_file_cmd,
       "no output file [FILE]",
       NO_STR
       "Direct vtysh output to file\n"
       "Direct vtysh output to file\n"
       "Path to dump output to\n")
{
        if (vty->of != stdout) {
                fclose(vty->of);
                vty->of = stdout;
        }
        return CMD_SUCCESS;
}

DEFUN(find,
      find_cmd,
      "find COMMAND...",
      "Find CLI command containing text\n"
      "Text to search for\n")
{
        char *text = argv_concat(argv, argc, 1);
        const struct cmd_node *node;
        const struct cmd_element *cli;
        vector clis;

        for (unsigned int i = 0; i < vector_active(cmdvec); i++) {
                node = vector_slot(cmdvec, i);
                if (!node)
                        continue;
                clis = node->cmd_vector;
                for (unsigned int j = 0; j < vector_active(clis); j++) {
                        cli = vector_slot(clis, j);
                        if (strcasestr(cli->string, text))
                                vty_out(vty, "  (%s)  %s\n",
                                        node_names[node->node], cli->string);
                }
        }

        XFREE(MTYPE_TMP, text);

        return CMD_SUCCESS;
}

DEFUN_HIDDEN(show_cli_graph_vtysh,
             show_cli_graph_vtysh_cmd,
             "show cli graph",
             SHOW_STR
             "CLI reflection\n"
             "Dump current command space as DOT graph\n")
{
        struct cmd_node *cn = vector_slot(cmdvec, vty->node);
        char *dot = cmd_graph_dump_dot(cn->cmdgraph);

        vty_out(vty, "%s\n", dot);
        XFREE(MTYPE_TMP, dot);
        return CMD_SUCCESS;
}

static void vtysh_install_default(enum node_type node)
{
        install_element(node, &config_list_cmd);
        install_element(node, &find_cmd);
        install_element(node, &show_cli_graph_vtysh_cmd);
        install_element(node, &vtysh_output_file_cmd);
        install_element(node, &no_vtysh_output_file_cmd);
}

/* Making connection to protocol daemon. */
static int vtysh_connect(struct vtysh_client *vclient)
{
        int ret;
        int sock, len;
        struct sockaddr_un addr;
        struct stat s_stat;
        const char *path;

        if (!vclient->path[0])
                snprintf(vclient->path, sizeof(vclient->path), "%s/%s.vty",
                         vtydir, vclient->name);
        path = vclient->path;

        /* Stat socket to see if we have permission to access it. */
        ret = stat(path, &s_stat);
        if (ret < 0 && errno != ENOENT) {
                fprintf(stderr, "vtysh_connect(%s): stat = %s\n", path,
                        safe_strerror(errno));
                exit(1);
        }

        if (ret >= 0) {
                if (!S_ISSOCK(s_stat.st_mode)) {
                        fprintf(stderr, "vtysh_connect(%s): Not a socket\n",
                                path);
                        exit(1);
                }
        }

        sock = socket(AF_UNIX, SOCK_STREAM, 0);
        if (sock < 0) {
#ifdef DEBUG
                fprintf(stderr, "vtysh_connect(%s): socket = %s\n", path,
                        safe_strerror(errno));
#endif /* DEBUG */
                return -1;
        }

        memset(&addr, 0, sizeof(struct sockaddr_un));
        addr.sun_family = AF_UNIX;
        strlcpy(addr.sun_path, path, sizeof(addr.sun_path));
#ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
        len = addr.sun_len = SUN_LEN(&addr);
#else
        len = sizeof(addr.sun_family) + strlen(addr.sun_path);
#endif /* HAVE_STRUCT_SOCKADDR_UN_SUN_LEN */

        ret = connect(sock, (struct sockaddr *)&addr, len);
        if (ret < 0) {
#ifdef DEBUG
                fprintf(stderr, "vtysh_connect(%s): connect = %s\n", path,
                        safe_strerror(errno));
#endif /* DEBUG */
                close(sock);
                return -1;
        }
        vclient->fd = sock;

        return 0;
}

static int vtysh_reconnect(struct vtysh_client *vclient)
{
        int ret;

        fprintf(stderr, "Warning: connecting to %s...", vclient->name);
        ret = vtysh_connect(vclient);
        if (ret < 0) {
                fprintf(stderr, "failed!\n");
                return ret;
        }
        fprintf(stderr, "success!\n");
        if (vtysh_client_execute(vclient, "enable") < 0)
                return -1;
        return vtysh_execute_no_pager("end");
}

/* Return true if str ends with suffix, else return false */
static int ends_with(const char *str, const char *suffix)
{
        if (!str || !suffix)
                return 0;
        size_t lenstr = strlen(str);
        size_t lensuffix = strlen(suffix);
        if (lensuffix > lenstr)
                return 0;
        return strncmp(str + lenstr - lensuffix, suffix, lensuffix) == 0;
}

static void vtysh_client_sorted_insert(struct vtysh_client *head_client,
                                       struct vtysh_client *client)
{
        struct vtysh_client *prev_node, *current_node;

        prev_node = head_client;
        current_node = head_client->next;
        while (current_node) {
                if (strcmp(current_node->path, client->path) > 0)
                        break;

                prev_node = current_node;
                current_node = current_node->next;
        }
        client->next = current_node;
        prev_node->next = client;
}

#define MAXIMUM_INSTANCES 10

static void vtysh_update_all_instances(struct vtysh_client *head_client)
{
        struct vtysh_client *client;
        DIR *dir;
        struct dirent *file;
        int n = 0;

        if (head_client->flag != VTYSH_OSPFD)
                return;

        /* ls vty_sock_dir and look for all files ending in .vty */
        dir = opendir(vtydir);
        if (dir) {
                while ((file = readdir(dir)) != NULL) {
                        if (frrstr_startswith(file->d_name, "ospfd-")
                            && ends_with(file->d_name, ".vty")) {
                                if (n == MAXIMUM_INSTANCES) {
                                        fprintf(stderr,
                                                "Parsing %s, client limit(%d) reached!\n",
                                                vtydir, n);
                                        break;
                                }
                                client = (struct vtysh_client *)malloc(
                                        sizeof(struct vtysh_client));
                                client->fd = -1;
                                client->name = "ospfd";
                                client->flag = VTYSH_OSPFD;
                                snprintf(client->path, sizeof(client->path),
                                         "%s/%s", vtydir, file->d_name);
                                client->next = NULL;
                                vtysh_client_sorted_insert(head_client, client);
                                n++;
                        }
                }
                closedir(dir);
        }
}

static int vtysh_connect_all_instances(struct vtysh_client *head_client)
{
        struct vtysh_client *client;
        int rc = 0;

        vtysh_update_all_instances(head_client);

        client = head_client->next;
        while (client) {
                if (vtysh_connect(client) == 0)
                        rc++;
                client = client->next;
        }

        return rc;
}

int vtysh_connect_all(const char *daemon_name)
{
        unsigned int i;
        int rc = 0;
        int matches = 0;

        for (i = 0; i < array_size(vtysh_client); i++) {
                if (!daemon_name
                    || !strcmp(daemon_name, vtysh_client[i].name)) {
                        matches++;
                        if (vtysh_connect(&vtysh_client[i]) == 0)
                                rc++;

                        rc += vtysh_connect_all_instances(&vtysh_client[i]);
                }
        }
        if (!matches)
                fprintf(stderr, "Error: no daemons match name %s!\n",
                        daemon_name);
        return rc;
}

/* To disable readline's filename completion. */
static char *vtysh_completion_entry_function(const char *ignore,
                                             int invoking_key)
{
        return NULL;
}

void vtysh_readline_init(void)
{
        /* readline related settings. */
        rl_initialize();
        rl_bind_key('?', (rl_command_func_t *)vtysh_rl_describe);
        rl_completion_entry_function = vtysh_completion_entry_function;
        rl_attempted_completion_function = new_completion;
}

char *vtysh_prompt(void)
{
        static char buf[512];

        snprintf(buf, sizeof buf, cmd_prompt(vty->node), cmd_hostname_get());
        return buf;
}

static void vtysh_ac_line(void *arg, const char *line)
{
        vector comps = arg;
        size_t i;
        for (i = 0; i < vector_active(comps); i++)
                if (!strcmp(line, (char *)vector_slot(comps, i)))
                        return;
        vector_set(comps, XSTRDUP(MTYPE_COMPLETION, line));
}

static void vtysh_autocomplete(vector comps, struct cmd_token *token)
{
        char accmd[256];
        size_t i;

        snprintf(accmd, sizeof(accmd), "autocomplete %d %s %s", token->type,
                 token->text, token->varname ? token->varname : "-");

        vty->of_saved = vty->of;
        vty->of = NULL;
        for (i = 0; i < array_size(vtysh_client); i++)
                vtysh_client_run_all(&vtysh_client[i], accmd, 1, vtysh_ac_line,
                                     comps);
        vty->of = vty->of_saved;
}

static const struct cmd_variable_handler vtysh_var_handler[] = {
        {/* match all */
         .tokenname = NULL,
         .varname = NULL,
         .completions = vtysh_autocomplete},
        {.completions = NULL}};

void vtysh_uninit(void)
{
        if (vty->of != stdout)
                fclose(vty->of);
}

void vtysh_init_vty(void)
{
        /* Make vty structure. */
        vty = vty_new();
        vty->type = VTY_SHELL;
        vty->node = VIEW_NODE;

        /* set default output */
        vty->of = stdout;
        vtysh_pager_envdef(false);

        /* Initialize commands. */
        cmd_init(0);
        cmd_variable_handler_register(vtysh_var_handler);

        /* Install nodes. */
        install_node(&bgp_node, NULL);
        install_node(&rip_node, NULL);
        install_node(&interface_node, NULL);
        install_node(&pw_node, NULL);
        install_node(&link_params_node, NULL);
        install_node(&vrf_node, NULL);
        install_node(&nh_group_node, NULL);
        install_node(&rmap_node, NULL);
        install_node(&pbr_map_node, NULL);
        install_node(&zebra_node, NULL);
        install_node(&bgp_vpnv4_node, NULL);
        install_node(&bgp_vpnv6_node, NULL);
        install_node(&bgp_flowspecv4_node, NULL);
        install_node(&bgp_flowspecv6_node, NULL);
        install_node(&bgp_ipv4_node, NULL);
        install_node(&bgp_ipv4m_node, NULL);
        install_node(&bgp_ipv4l_node, NULL);
        install_node(&bgp_ipv6_node, NULL);
        install_node(&bgp_ipv6m_node, NULL);
        install_node(&bgp_ipv6l_node, NULL);
        install_node(&bgp_vrf_policy_node, NULL);
        install_node(&bgp_evpn_node, NULL);
        install_node(&bgp_evpn_vni_node, NULL);
        install_node(&bgp_vnc_defaults_node, NULL);
        install_node(&bgp_vnc_nve_group_node, NULL);
        install_node(&bgp_vnc_l2_group_node, NULL);
        install_node(&ospf_node, NULL);
        install_node(&eigrp_node, NULL);
        install_node(&babel_node, NULL);
        install_node(&ripng_node, NULL);
        install_node(&ospf6_node, NULL);
        install_node(&ldp_node, NULL);
        install_node(&ldp_ipv4_node, NULL);
        install_node(&ldp_ipv6_node, NULL);
        install_node(&ldp_ipv4_iface_node, NULL);
        install_node(&ldp_ipv6_iface_node, NULL);
        install_node(&ldp_l2vpn_node, NULL);
        install_node(&ldp_pseudowire_node, NULL);
        install_node(&keychain_node, NULL);
        install_node(&keychain_key_node, NULL);
        install_node(&isis_node, NULL);
        install_node(&openfabric_node, NULL);
        install_node(&vty_node, NULL);
        install_node(&rpki_node, NULL);
        install_node(&bmp_node, NULL);
#if HAVE_BFDD > 0
        install_node(&bfd_node, NULL);
        install_node(&bfd_peer_node, NULL);
#endif /* HAVE_BFDD */

        struct cmd_node *node;
        for (unsigned int i = 0; i < vector_active(cmdvec); i++) {
                node = vector_slot(cmdvec, i);
                if (!node || node->node == VIEW_NODE)
                        continue;
                vtysh_install_default(node->node);
        }

        install_element(VIEW_NODE, &vtysh_enable_cmd);
        install_element(ENABLE_NODE, &vtysh_config_terminal_cmd);
        install_element(ENABLE_NODE, &vtysh_disable_cmd);

        /* "exit" command. */
        install_element(VIEW_NODE, &vtysh_exit_all_cmd);
        install_element(CONFIG_NODE, &vtysh_exit_all_cmd);
        install_element(VIEW_NODE, &vtysh_quit_all_cmd);
        install_element(CONFIG_NODE, &vtysh_quit_all_cmd);
        install_element(RIP_NODE, &vtysh_exit_ripd_cmd);
        install_element(RIP_NODE, &vtysh_quit_ripd_cmd);
        install_element(RIPNG_NODE, &vtysh_exit_ripngd_cmd);
        install_element(RIPNG_NODE, &vtysh_quit_ripngd_cmd);
        install_element(OSPF_NODE, &vtysh_exit_ospfd_cmd);
        install_element(OSPF_NODE, &vtysh_quit_ospfd_cmd);
        install_element(EIGRP_NODE, &vtysh_exit_eigrpd_cmd);
        install_element(EIGRP_NODE, &vtysh_quit_eigrpd_cmd);
        install_element(BABEL_NODE, &vtysh_exit_babeld_cmd);
        install_element(BABEL_NODE, &vtysh_quit_babeld_cmd);
        install_element(OSPF6_NODE, &vtysh_exit_ospf6d_cmd);
        install_element(OSPF6_NODE, &vtysh_quit_ospf6d_cmd);
#if defined(HAVE_LDPD)
        install_element(LDP_NODE, &vtysh_exit_ldpd_cmd);
        install_element(LDP_NODE, &vtysh_quit_ldpd_cmd);
        install_element(LDP_IPV4_NODE, &vtysh_exit_ldpd_cmd);
        install_element(LDP_IPV4_NODE, &vtysh_quit_ldpd_cmd);
        install_element(LDP_IPV4_NODE, &ldp_exit_address_family_cmd);
        install_element(LDP_IPV6_NODE, &vtysh_exit_ldpd_cmd);
        install_element(LDP_IPV6_NODE, &vtysh_quit_ldpd_cmd);
        install_element(LDP_IPV6_NODE, &ldp_exit_address_family_cmd);
        install_element(LDP_IPV4_IFACE_NODE, &vtysh_exit_ldpd_cmd);
        install_element(LDP_IPV4_IFACE_NODE, &vtysh_quit_ldpd_cmd);
        install_element(LDP_IPV6_IFACE_NODE, &vtysh_exit_ldpd_cmd);
        install_element(LDP_IPV6_IFACE_NODE, &vtysh_quit_ldpd_cmd);
        install_element(LDP_L2VPN_NODE, &vtysh_exit_ldpd_cmd);
        install_element(LDP_L2VPN_NODE, &vtysh_quit_ldpd_cmd);
        install_element(LDP_PSEUDOWIRE_NODE, &vtysh_exit_ldpd_cmd);
        install_element(LDP_PSEUDOWIRE_NODE, &vtysh_quit_ldpd_cmd);
#endif
        install_element(BGP_NODE, &vtysh_exit_bgpd_cmd);
        install_element(BGP_NODE, &vtysh_quit_bgpd_cmd);
        install_element(BGP_VPNV4_NODE, &vtysh_exit_bgpd_cmd);
        install_element(BGP_VPNV4_NODE, &vtysh_quit_bgpd_cmd);
        install_element(BGP_VPNV6_NODE, &vtysh_exit_bgpd_cmd);
        install_element(BGP_VPNV6_NODE, &vtysh_quit_bgpd_cmd);
        install_element(BGP_FLOWSPECV4_NODE, &vtysh_exit_bgpd_cmd);
        install_element(BGP_FLOWSPECV4_NODE, &vtysh_quit_bgpd_cmd);
        install_element(BGP_FLOWSPECV6_NODE, &vtysh_exit_bgpd_cmd);
        install_element(BGP_FLOWSPECV6_NODE, &vtysh_quit_bgpd_cmd);
        install_element(BGP_IPV4_NODE, &vtysh_exit_bgpd_cmd);
        install_element(BGP_IPV4_NODE, &vtysh_quit_bgpd_cmd);
        install_element(BGP_IPV4M_NODE, &vtysh_exit_bgpd_cmd);
        install_element(BGP_IPV4M_NODE, &vtysh_quit_bgpd_cmd);
        install_element(BGP_IPV4L_NODE, &vtysh_exit_bgpd_cmd);
        install_element(BGP_IPV4L_NODE, &vtysh_quit_bgpd_cmd);
        install_element(BGP_IPV6_NODE, &vtysh_exit_bgpd_cmd);
        install_element(BGP_IPV6_NODE, &vtysh_quit_bgpd_cmd);
        install_element(BGP_IPV6M_NODE, &vtysh_exit_bgpd_cmd);
        install_element(BGP_IPV6M_NODE, &vtysh_quit_bgpd_cmd);
        install_element(BGP_EVPN_NODE, &vtysh_quit_bgpd_cmd);
        install_element(BGP_EVPN_NODE, &vtysh_exit_bgpd_cmd);
        install_element(BGP_EVPN_VNI_NODE, &vtysh_exit_bgpd_cmd);
        install_element(BGP_EVPN_VNI_NODE, &vtysh_quit_bgpd_cmd);
        install_element(BGP_IPV6L_NODE, &vtysh_exit_bgpd_cmd);
        install_element(BGP_IPV6L_NODE, &vtysh_quit_bgpd_cmd);
#if defined(ENABLE_BGP_VNC)
        install_element(BGP_VRF_POLICY_NODE, &vtysh_exit_bgpd_cmd);
        install_element(BGP_VRF_POLICY_NODE, &vtysh_quit_bgpd_cmd);
        install_element(BGP_VNC_DEFAULTS_NODE, &vtysh_exit_bgpd_cmd);
        install_element(BGP_VNC_DEFAULTS_NODE, &vtysh_quit_bgpd_cmd);
        install_element(BGP_VNC_NVE_GROUP_NODE, &vtysh_exit_bgpd_cmd);
        install_element(BGP_VNC_NVE_GROUP_NODE, &vtysh_quit_bgpd_cmd);
        install_element(BGP_VNC_L2_GROUP_NODE, &vtysh_exit_bgpd_cmd);
        install_element(BGP_VNC_L2_GROUP_NODE, &vtysh_quit_bgpd_cmd);
#endif
        install_element(ISIS_NODE, &vtysh_exit_isisd_cmd);
        install_element(ISIS_NODE, &vtysh_quit_isisd_cmd);
        install_element(OPENFABRIC_NODE, &vtysh_exit_fabricd_cmd);
        install_element(OPENFABRIC_NODE, &vtysh_quit_fabricd_cmd);
        install_element(KEYCHAIN_NODE, &vtysh_exit_ripd_cmd);
        install_element(KEYCHAIN_NODE, &vtysh_quit_ripd_cmd);
        install_element(KEYCHAIN_KEY_NODE, &vtysh_exit_ripd_cmd);
        install_element(KEYCHAIN_KEY_NODE, &vtysh_quit_ripd_cmd);
        install_element(RMAP_NODE, &vtysh_exit_rmap_cmd);
        install_element(RMAP_NODE, &vtysh_quit_rmap_cmd);
        install_element(PBRMAP_NODE, &vtysh_exit_pbr_map_cmd);
        install_element(PBRMAP_NODE, &vtysh_quit_pbr_map_cmd);
#if HAVE_BFDD > 0
        /* Enter node. */
        install_element(CONFIG_NODE, &bfd_enter_cmd);
        install_element(BFD_NODE, &bfd_peer_enter_cmd);

        /* Exit/quit node. */
        install_element(BFD_NODE, &vtysh_exit_bfdd_cmd);
        install_element(BFD_NODE, &vtysh_quit_bfdd_cmd);
        install_element(BFD_PEER_NODE, &vtysh_exit_bfdd_cmd);
        install_element(BFD_PEER_NODE, &vtysh_quit_bfdd_cmd);

        /* End/exit all. */
        install_element(BFD_NODE, &vtysh_end_all_cmd);
        install_element(BFD_PEER_NODE, &vtysh_end_all_cmd);
#endif /* HAVE_BFDD */
        install_element(VTY_NODE, &vtysh_exit_line_vty_cmd);
        install_element(VTY_NODE, &vtysh_quit_line_vty_cmd);

        /* "end" command. */
        install_element(CONFIG_NODE, &vtysh_end_all_cmd);
        install_element(ENABLE_NODE, &vtysh_end_all_cmd);
        install_element(RIP_NODE, &vtysh_end_all_cmd);
        install_element(RIPNG_NODE, &vtysh_end_all_cmd);
        install_element(OSPF_NODE, &vtysh_end_all_cmd);
        install_element(EIGRP_NODE, &vtysh_end_all_cmd);
        install_element(BABEL_NODE, &vtysh_end_all_cmd);
        install_element(OSPF6_NODE, &vtysh_end_all_cmd);
        install_element(LDP_NODE, &vtysh_end_all_cmd);
        install_element(LDP_IPV4_NODE, &vtysh_end_all_cmd);
        install_element(LDP_IPV6_NODE, &vtysh_end_all_cmd);
        install_element(LDP_IPV4_IFACE_NODE, &vtysh_end_all_cmd);
        install_element(LDP_IPV6_IFACE_NODE, &vtysh_end_all_cmd);
        install_element(LDP_L2VPN_NODE, &vtysh_end_all_cmd);
        install_element(LDP_PSEUDOWIRE_NODE, &vtysh_end_all_cmd);
        install_element(BGP_NODE, &vtysh_end_all_cmd);
        install_element(BGP_IPV4_NODE, &vtysh_end_all_cmd);
        install_element(BGP_IPV4M_NODE, &vtysh_end_all_cmd);
        install_element(BGP_IPV4L_NODE, &vtysh_end_all_cmd);
        install_element(BGP_VPNV4_NODE, &vtysh_end_all_cmd);
        install_element(BGP_VPNV6_NODE, &vtysh_end_all_cmd);
        install_element(BGP_FLOWSPECV4_NODE, &vtysh_end_all_cmd);
        install_element(BGP_FLOWSPECV6_NODE, &vtysh_end_all_cmd);
        install_element(BGP_IPV6_NODE, &vtysh_end_all_cmd);
        install_element(BGP_IPV6M_NODE, &vtysh_end_all_cmd);
        install_element(BGP_IPV6L_NODE, &vtysh_end_all_cmd);
        install_element(BGP_VRF_POLICY_NODE, &vtysh_end_all_cmd);
        install_element(BGP_EVPN_NODE, &vtysh_end_all_cmd);
        install_element(BGP_EVPN_VNI_NODE, &vtysh_end_all_cmd);
        install_element(BGP_VNC_DEFAULTS_NODE, &vtysh_end_all_cmd);
        install_element(BGP_VNC_NVE_GROUP_NODE, &vtysh_end_all_cmd);
        install_element(BGP_VNC_L2_GROUP_NODE, &vtysh_end_all_cmd);
        install_element(ISIS_NODE, &vtysh_end_all_cmd);
        install_element(OPENFABRIC_NODE, &vtysh_end_all_cmd);
        install_element(KEYCHAIN_NODE, &vtysh_end_all_cmd);
        install_element(KEYCHAIN_KEY_NODE, &vtysh_end_all_cmd);
        install_element(RMAP_NODE, &vtysh_end_all_cmd);
        install_element(PBRMAP_NODE, &vtysh_end_all_cmd);
        install_element(VTY_NODE, &vtysh_end_all_cmd);

        install_element(INTERFACE_NODE, &vtysh_end_all_cmd);
        install_element(INTERFACE_NODE, &vtysh_exit_interface_cmd);
        install_element(LINK_PARAMS_NODE, &exit_link_params_cmd);
        install_element(LINK_PARAMS_NODE, &vtysh_end_all_cmd);
        install_element(LINK_PARAMS_NODE, &vtysh_exit_interface_cmd);
        install_element(INTERFACE_NODE, &vtysh_quit_interface_cmd);

        install_element(PW_NODE, &vtysh_end_all_cmd);
        install_element(PW_NODE, &vtysh_exit_interface_cmd);
        install_element(PW_NODE, &vtysh_quit_interface_cmd);

        install_element(CONFIG_NODE, &vtysh_nexthop_group_cmd);
        install_element(NH_GROUP_NODE, &vtysh_end_all_cmd);
        install_element(NH_GROUP_NODE, &vtysh_exit_nexthop_group_cmd);
        install_element(NH_GROUP_NODE, &vtysh_quit_nexthop_group_cmd);

        install_element(VRF_NODE, &vtysh_end_all_cmd);
        install_element(VRF_NODE, &vtysh_exit_vrf_cmd);
        install_element(VRF_NODE, &vtysh_quit_vrf_cmd);

        install_element(CONFIG_NODE, &router_eigrp_cmd);
        install_element(CONFIG_NODE, &router_babel_cmd);
        install_element(CONFIG_NODE, &router_rip_cmd);
        install_element(CONFIG_NODE, &router_ripng_cmd);
        install_element(CONFIG_NODE, &router_ospf_cmd);
        install_element(CONFIG_NODE, &router_ospf6_cmd);
#if defined(HAVE_LDPD)
        install_element(CONFIG_NODE, &ldp_mpls_ldp_cmd);
        install_element(LDP_NODE, &ldp_address_family_ipv4_cmd);
        install_element(LDP_NODE, &ldp_address_family_ipv6_cmd);
        install_element(LDP_IPV4_NODE, &ldp_interface_ifname_cmd);
        install_element(LDP_IPV6_NODE, &ldp_interface_ifname_cmd);
        install_element(CONFIG_NODE, &ldp_l2vpn_word_type_vpls_cmd);
        install_element(LDP_L2VPN_NODE, &ldp_member_pseudowire_ifname_cmd);
#endif
        install_element(CONFIG_NODE, &router_isis_cmd);
        install_element(CONFIG_NODE, &router_openfabric_cmd);
        install_element(CONFIG_NODE, &router_bgp_cmd);
#ifdef KEEP_OLD_VPN_COMMANDS
        install_element(BGP_NODE, &address_family_vpnv4_cmd);
        install_element(BGP_NODE, &address_family_vpnv6_cmd);
#endif /* KEEP_OLD_VPN_COMMANDS */
#if defined(ENABLE_BGP_VNC)
        install_element(BGP_NODE, &vnc_vrf_policy_cmd);
        install_element(BGP_NODE, &vnc_defaults_cmd);
        install_element(BGP_NODE, &vnc_nve_group_cmd);
        install_element(BGP_NODE, &vnc_l2_group_cmd);
#endif
        install_element(BGP_NODE, &address_family_ipv4_cmd);
        install_element(BGP_NODE, &address_family_ipv4_multicast_cmd);
        install_element(BGP_NODE, &address_family_ipv4_vpn_cmd);
        install_element(BGP_NODE, &address_family_ipv4_labeled_unicast_cmd);
        install_element(BGP_NODE, &address_family_ipv6_cmd);
        install_element(BGP_NODE, &address_family_ipv6_multicast_cmd);
        install_element(BGP_NODE, &address_family_ipv6_vpn_cmd);
        install_element(BGP_NODE, &address_family_ipv6_labeled_unicast_cmd);
        install_element(BGP_NODE, &address_family_evpn_cmd);
        install_element(BGP_NODE, &address_family_flowspecv4_cmd);
        install_element(BGP_NODE, &address_family_flowspecv6_cmd);
#if defined(HAVE_CUMULUS)
        install_element(BGP_NODE, &address_family_evpn2_cmd);
#endif
        install_element(BGP_VPNV4_NODE, &exit_address_family_cmd);
        install_element(BGP_VPNV6_NODE, &exit_address_family_cmd);
        install_element(BGP_IPV4_NODE, &exit_address_family_cmd);
        install_element(BGP_IPV4M_NODE, &exit_address_family_cmd);
        install_element(BGP_IPV4L_NODE, &exit_address_family_cmd);
        install_element(BGP_IPV6_NODE, &exit_address_family_cmd);
        install_element(BGP_IPV6M_NODE, &exit_address_family_cmd);
        install_element(BGP_EVPN_NODE, &exit_address_family_cmd);
        install_element(BGP_IPV6L_NODE, &exit_address_family_cmd);
        install_element(BGP_FLOWSPECV4_NODE, &exit_address_family_cmd);
        install_element(BGP_FLOWSPECV6_NODE, &exit_address_family_cmd);

        install_element(BGP_NODE, &bmp_targets_cmd);
        install_element(BMP_NODE, &bmp_exit_cmd);
        install_element(BMP_NODE, &bmp_quit_cmd);
        install_element(BMP_NODE, &vtysh_end_all_cmd);

        install_element(CONFIG_NODE, &rpki_cmd);
        install_element(RPKI_NODE, &rpki_exit_cmd);
        install_element(RPKI_NODE, &rpki_quit_cmd);
        install_element(RPKI_NODE, &vtysh_end_all_cmd);

        /* EVPN commands */
        install_element(BGP_EVPN_NODE, &bgp_evpn_vni_cmd);
        install_element(BGP_EVPN_VNI_NODE, &exit_vni_cmd);

        install_element(BGP_VRF_POLICY_NODE, &exit_vrf_policy_cmd);
        install_element(BGP_VNC_DEFAULTS_NODE, &exit_vnc_config_cmd);
        install_element(BGP_VNC_NVE_GROUP_NODE, &exit_vnc_config_cmd);
        install_element(BGP_VNC_L2_GROUP_NODE, &exit_vnc_config_cmd);

        install_element(CONFIG_NODE, &key_chain_cmd);
        install_element(CONFIG_NODE, &vtysh_route_map_cmd);
        install_element(CONFIG_NODE, &vtysh_pbr_map_cmd);
        install_element(CONFIG_NODE, &vtysh_no_pbr_map_cmd);
        install_element(CONFIG_NODE, &vtysh_line_vty_cmd);
        install_element(KEYCHAIN_NODE, &key_cmd);
        install_element(KEYCHAIN_NODE, &key_chain_cmd);
        install_element(KEYCHAIN_KEY_NODE, &key_chain_cmd);
        install_element(CONFIG_NODE, &vtysh_interface_cmd);
        install_element(CONFIG_NODE, &vtysh_pseudowire_cmd);
        install_element(INTERFACE_NODE, &vtysh_link_params_cmd);
        install_element(ENABLE_NODE, &vtysh_show_running_config_cmd);
        install_element(ENABLE_NODE, &vtysh_copy_running_config_cmd);

        install_element(CONFIG_NODE, &vtysh_vrf_cmd);
        install_element(VRF_NODE, &vtysh_vrf_netns_cmd);
        install_element(VRF_NODE, &vtysh_no_vrf_netns_cmd);
        install_element(VRF_NODE, &exit_vrf_config_cmd);

        install_element(CONFIG_NODE, &vtysh_no_nexthop_group_cmd);

        /* "write terminal" command. */
        install_element(ENABLE_NODE, &vtysh_write_terminal_cmd);

        install_element(CONFIG_NODE, &vtysh_integrated_config_cmd);
        install_element(CONFIG_NODE, &no_vtysh_integrated_config_cmd);

        /* "write memory" command. */
        install_element(ENABLE_NODE, &vtysh_write_memory_cmd);

        install_element(CONFIG_NODE, &vtysh_terminal_paginate_cmd);
        install_element(VIEW_NODE, &vtysh_terminal_paginate_cmd);
        install_element(VIEW_NODE, &vtysh_terminal_length_cmd);
        install_element(VIEW_NODE, &vtysh_terminal_no_length_cmd);
        install_element(VIEW_NODE, &vtysh_show_daemons_cmd);

        install_element(VIEW_NODE, &vtysh_ping_cmd);
        install_element(VIEW_NODE, &vtysh_ping_ip_cmd);
        install_element(VIEW_NODE, &vtysh_traceroute_cmd);
        install_element(VIEW_NODE, &vtysh_traceroute_ip_cmd);
        install_element(VIEW_NODE, &vtysh_mtrace_cmd);
        install_element(VIEW_NODE, &vtysh_ping6_cmd);
        install_element(VIEW_NODE, &vtysh_traceroute6_cmd);
#if defined(HAVE_SHELL_ACCESS)
        install_element(VIEW_NODE, &vtysh_telnet_cmd);
        install_element(VIEW_NODE, &vtysh_telnet_port_cmd);
        install_element(VIEW_NODE, &vtysh_ssh_cmd);
#endif
#if defined(HAVE_SHELL_ACCESS)
        install_element(ENABLE_NODE, &vtysh_start_shell_cmd);
        install_element(ENABLE_NODE, &vtysh_start_bash_cmd);
        install_element(ENABLE_NODE, &vtysh_start_zsh_cmd);
#endif

        /* debugging */
        install_element(VIEW_NODE, &vtysh_show_debugging_cmd);
        install_element(VIEW_NODE, &vtysh_show_error_code_cmd);
        install_element(VIEW_NODE, &vtysh_show_debugging_hashtable_cmd);
        install_element(ENABLE_NODE, &vtysh_debug_all_cmd);
        install_element(CONFIG_NODE, &vtysh_debug_all_cmd);
        install_element(ENABLE_NODE, &vtysh_debug_memstats_cmd);
        install_element(CONFIG_NODE, &vtysh_debug_memstats_cmd);

        /* misc lib show commands */
        install_element(VIEW_NODE, &vtysh_show_memory_cmd);
        install_element(VIEW_NODE, &vtysh_show_modules_cmd);
        install_element(VIEW_NODE, &vtysh_show_work_queues_cmd);
        install_element(VIEW_NODE, &vtysh_show_work_queues_daemon_cmd);
        install_element(VIEW_NODE, &vtysh_show_thread_cmd);
        install_element(VIEW_NODE, &vtysh_show_poll_cmd);

        /* Logging */
        install_element(VIEW_NODE, &vtysh_show_logging_cmd);
        install_element(VIEW_NODE, &vtysh_show_log_filter_cmd);
        install_element(CONFIG_NODE, &vtysh_log_filter_cmd);
        install_element(CONFIG_NODE, &vtysh_log_filter_clear_cmd);
        install_element(CONFIG_NODE, &vtysh_log_stdout_cmd);
        install_element(CONFIG_NODE, &vtysh_log_stdout_level_cmd);
        install_element(CONFIG_NODE, &no_vtysh_log_stdout_cmd);
        install_element(CONFIG_NODE, &vtysh_log_file_cmd);
        install_element(CONFIG_NODE, &vtysh_log_file_level_cmd);
        install_element(CONFIG_NODE, &no_vtysh_log_file_cmd);
        install_element(CONFIG_NODE, &vtysh_log_monitor_cmd);
        install_element(CONFIG_NODE, &no_vtysh_log_monitor_cmd);
        install_element(CONFIG_NODE, &vtysh_log_syslog_cmd);
        install_element(CONFIG_NODE, &no_vtysh_log_syslog_cmd);
        install_element(CONFIG_NODE, &vtysh_log_facility_cmd);
        install_element(CONFIG_NODE, &no_vtysh_log_facility_cmd);
        install_element(CONFIG_NODE, &vtysh_log_record_priority_cmd);
        install_element(CONFIG_NODE, &no_vtysh_log_record_priority_cmd);
        install_element(CONFIG_NODE, &vtysh_log_timestamp_precision_cmd);
        install_element(CONFIG_NODE, &no_vtysh_log_timestamp_precision_cmd);

        install_element(CONFIG_NODE, &vtysh_service_password_encrypt_cmd);
        install_element(CONFIG_NODE, &no_vtysh_service_password_encrypt_cmd);

        install_element(CONFIG_NODE, &vtysh_password_cmd);
        install_element(CONFIG_NODE, &no_vtysh_password_cmd);
        install_element(CONFIG_NODE, &vtysh_enable_password_cmd);
        install_element(CONFIG_NODE, &no_vtysh_enable_password_cmd);
}