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cli.c

// L2TPNS Command Line Interface
// vim: sw=8 ts=8

char const *cvs_name = "$Name: release_2_1_21 $";
char const *cvs_id_cli = "$Id: cli.c,v 1.71 2005/12/06 09:43:42 bodea Exp $";

#include <stdio.h>
#include <stddef.h>
#include <stdarg.h>
#include <unistd.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <syslog.h>
#include <malloc.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <time.h>
#include <arpa/inet.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <signal.h>
#include <dlfcn.h>
#include <netdb.h>
#include <libcli.h>

#include "l2tpns.h"
#include "constants.h"
#include "util.h"
#include "cluster.h"
#include "tbf.h"
#include "ll.h"
#ifdef BGP
#include "bgp.h"
#endif

extern tunnelt *tunnel;
extern sessiont *session;
extern radiust *radius;
extern ippoolt *ip_address_pool;
extern struct Tstats *_statistics;
static struct cli_def *cli = NULL;
extern configt *config;
extern config_descriptt config_values[];
#ifdef RINGBUFFER
extern struct Tringbuffer *ringbuffer;
#endif
extern struct cli_session_actions *cli_session_actions;
extern struct cli_tunnel_actions *cli_tunnel_actions;
extern tbft *filter_list;
extern ip_filtert *ip_filters;

struct
{
      char critical;
      char error;
      char warning;
      char info;
      char calls;
      char data;
} debug_flags;

#ifdef RINGBUFFER

static int debug_rb_tail;
static char *debug_levels[] = {
      "CRIT",
      "ERROR",
      "WARN",
      "INFO",
      "CALL",
      "DATA",
};

#endif

static int cmd_show_session(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_show_tunnels(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_show_users(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_show_radius(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_show_version(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_show_pool(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_show_run(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_show_banana(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_show_plugins(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_show_throttle(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_write_memory(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_drop_user(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_drop_tunnel(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_drop_session(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_snoop(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_no_snoop(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_throttle(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_no_throttle(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_debug(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_no_debug(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_set(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_load_plugin(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_remove_plugin(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_uptime(struct cli_def *cli, char *command, char **argv, int argc);

static int regular_stuff(struct cli_def *cli);

#ifdef STATISTICS
static int cmd_show_counters(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_clear_counters(struct cli_def *cli, char *command, char **argv, int argc);
#endif /* STATISTICS */

#ifdef BGP
#define MODE_CONFIG_BGP 8
static int cmd_router_bgp(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_router_bgp_neighbour(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_router_bgp_no_neighbour(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_show_bgp(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_suspend_bgp(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_no_suspend_bgp(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_restart_bgp(struct cli_def *cli, char *command, char **argv, int argc);
#endif /* BGP */

#define MODE_CONFIG_NACL 9
static int cmd_ip_access_list(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_no_ip_access_list(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_ip_access_list_rule(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_filter(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_no_filter(struct cli_def *cli, char *command, char **argv, int argc);
static int cmd_show_access_list(struct cli_def *cli, char *command, char **argv, int argc);

/* match if b is a substr of a */
#define MATCH(a,b) (!strncmp((a), (b), strlen(b)))

void init_cli(char *hostname)
{
      FILE *f;
      char buf[4096];
      struct cli_command *c;
      struct cli_command *c2;
      int on = 1;
      struct sockaddr_in addr;

      cli = cli_init();
      if (hostname && *hostname)
            cli_set_hostname(cli, hostname);
      else
            cli_set_hostname(cli, "l2tpns");

      c = cli_register_command(cli, NULL, "show", NULL, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, NULL);
      cli_register_command(cli, c, "banana", cmd_show_banana, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Show a banana");
#ifdef BGP
      cli_register_command(cli, c, "bgp", cmd_show_bgp, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Show BGP status");
#endif /* BGP */
      cli_register_command(cli, c, "cluster", cmd_show_cluster, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Show cluster information");
      cli_register_command(cli, c, "ipcache", cmd_show_ipcache, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Show contents of the IP cache");
      cli_register_command(cli, c, "plugins", cmd_show_plugins, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "List all installed plugins");
      cli_register_command(cli, c, "pool", cmd_show_pool, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Show the IP address allocation pool");
      cli_register_command(cli, c, "radius", cmd_show_radius, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Show active radius queries");
      cli_register_command(cli, c, "running-config", cmd_show_run, PRIVILEGE_PRIVILEGED, MODE_EXEC, "Show the currently running configuration");
      cli_register_command(cli, c, "session", cmd_show_session, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Show a list of sessions or details for a single session");
      cli_register_command(cli, c, "tbf", cmd_show_tbf, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "List all token bucket filters in use");
      cli_register_command(cli, c, "throttle", cmd_show_throttle, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "List all throttled sessions and associated TBFs");
      cli_register_command(cli, c, "tunnels", cmd_show_tunnels, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Show a list of tunnels or details for a single tunnel");
      cli_register_command(cli, c, "users", cmd_show_users, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Show a list of all connected users or details of selected user");
      cli_register_command(cli, c, "version", cmd_show_version, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Show currently running software version");
      cli_register_command(cli, c, "access-list", cmd_show_access_list, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Show named access-list");

      c2 = cli_register_command(cli, c, "histogram", NULL, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, NULL);
      cli_register_command(cli, c2, "idle", cmd_show_hist_idle, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Show histogram of session idle times");
      cli_register_command(cli, c2, "open", cmd_show_hist_open, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Show histogram of session durations");

#ifdef STATISTICS
      cli_register_command(cli, c, "counters", cmd_show_counters, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Display all the internal counters and running totals");

      c = cli_register_command(cli, NULL, "clear", NULL, PRIVILEGE_PRIVILEGED, MODE_EXEC, NULL);
      cli_register_command(cli, c, "counters", cmd_clear_counters, PRIVILEGE_PRIVILEGED, MODE_EXEC, "Clear internal counters");
#endif

      cli_register_command(cli, NULL, "uptime", cmd_uptime, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Show uptime and bandwidth utilisation");

      c = cli_register_command(cli, NULL, "write", NULL, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, NULL);
      cli_register_command(cli, c, "memory", cmd_write_memory, PRIVILEGE_PRIVILEGED, MODE_EXEC, "Save the running config to flash");
      cli_register_command(cli, c, "terminal", cmd_show_run, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Show the running config");

      cli_register_command(cli, NULL, "snoop", cmd_snoop, PRIVILEGE_PRIVILEGED, MODE_EXEC, "Enable interception of a session");
      cli_register_command(cli, NULL, "throttle", cmd_throttle, PRIVILEGE_PRIVILEGED, MODE_EXEC, "Enable throttling of a session");
      cli_register_command(cli, NULL, "filter", cmd_filter, PRIVILEGE_PRIVILEGED, MODE_EXEC, "Add filtering to a session");
      cli_register_command(cli, NULL, "debug", cmd_debug, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Set the level of logging that is shown on the console");

#ifdef BGP
      c = cli_register_command(cli, NULL, "suspend", NULL, PRIVILEGE_PRIVILEGED, MODE_EXEC, NULL);
      cli_register_command(cli, c, "bgp", cmd_suspend_bgp, PRIVILEGE_PRIVILEGED, MODE_EXEC, "Withdraw routes from BGP neighbour");
#endif /* BGP */

      c = cli_register_command(cli, NULL, "no", NULL, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, NULL);
      cli_register_command(cli, c, "snoop", cmd_no_snoop, PRIVILEGE_PRIVILEGED, MODE_EXEC, "Disable interception of a session");
      cli_register_command(cli, c, "throttle", cmd_no_throttle, PRIVILEGE_PRIVILEGED, MODE_EXEC, "Disable throttling of a session");
      cli_register_command(cli, c, "filter", cmd_no_filter, PRIVILEGE_PRIVILEGED, MODE_EXEC, "Remove filtering from a session");
      cli_register_command(cli, c, "debug", cmd_no_debug, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Turn off logging of a certain level of debugging");

#ifdef BGP
      c2 = cli_register_command(cli, c, "suspend", NULL, PRIVILEGE_PRIVILEGED, MODE_EXEC, NULL);
      cli_register_command(cli, c2, "bgp", cmd_no_suspend_bgp, PRIVILEGE_PRIVILEGED, MODE_EXEC, "Advertise routes to BGP neighbour");

      c = cli_register_command(cli, NULL, "restart", NULL, PRIVILEGE_PRIVILEGED, MODE_EXEC, NULL);
      cli_register_command(cli, c, "bgp", cmd_restart_bgp, PRIVILEGE_PRIVILEGED, MODE_EXEC, "Restart BGP");

      c = cli_register_command(cli, NULL, "router", NULL, PRIVILEGE_PRIVILEGED, MODE_CONFIG, NULL);
      cli_register_command(cli, c, "bgp", cmd_router_bgp, PRIVILEGE_PRIVILEGED, MODE_CONFIG, "Configure BGP");

      cli_register_command(cli, NULL, "neighbour", cmd_router_bgp_neighbour, PRIVILEGE_PRIVILEGED, MODE_CONFIG_BGP, "Configure BGP neighbour");

      c = cli_register_command(cli, NULL, "no", NULL, PRIVILEGE_PRIVILEGED, MODE_CONFIG_BGP, NULL);
      cli_register_command(cli, c, "neighbour", cmd_router_bgp_no_neighbour, PRIVILEGE_PRIVILEGED, MODE_CONFIG_BGP, "Remove BGP neighbour");
#endif /* BGP */

      c = cli_register_command(cli, NULL, "drop", NULL, PRIVILEGE_PRIVILEGED, MODE_EXEC, NULL);
      cli_register_command(cli, c, "user", cmd_drop_user, PRIVILEGE_PRIVILEGED, MODE_EXEC, "Disconnect a user");
      cli_register_command(cli, c, "tunnel", cmd_drop_tunnel, PRIVILEGE_PRIVILEGED, MODE_EXEC, "Disconnect a tunnel and all sessions on that tunnel");
      cli_register_command(cli, c, "session", cmd_drop_session, PRIVILEGE_PRIVILEGED, MODE_EXEC, "Disconnect a session");

      c = cli_register_command(cli, NULL, "load", NULL, PRIVILEGE_PRIVILEGED, MODE_CONFIG, NULL);
      cli_register_command(cli, c, "plugin", cmd_load_plugin, PRIVILEGE_PRIVILEGED, MODE_CONFIG, "Load a plugin");

      c = cli_register_command(cli, NULL, "remove", NULL, PRIVILEGE_PRIVILEGED, MODE_CONFIG, NULL);
      cli_register_command(cli, c, "plugin", cmd_remove_plugin, PRIVILEGE_PRIVILEGED, MODE_CONFIG, "Remove a plugin");

      cli_register_command(cli, NULL, "set", cmd_set, PRIVILEGE_PRIVILEGED, MODE_CONFIG, "Set a configuration variable");

      c = cli_register_command(cli, NULL, "ip", NULL, PRIVILEGE_PRIVILEGED, MODE_CONFIG, NULL);
      cli_register_command(cli, c, "access-list", cmd_ip_access_list, PRIVILEGE_PRIVILEGED, MODE_CONFIG, "Add named access-list");

      cli_register_command(cli, NULL, "permit", cmd_ip_access_list_rule, PRIVILEGE_PRIVILEGED, MODE_CONFIG_NACL, "Permit rule");
      cli_register_command(cli, NULL, "deny", cmd_ip_access_list_rule, PRIVILEGE_PRIVILEGED, MODE_CONFIG_NACL, "Deny rule");

      c = cli_register_command(cli, NULL, "no", NULL, PRIVILEGE_UNPRIVILEGED, MODE_CONFIG, NULL);
      c2 = cli_register_command(cli, c, "ip", NULL, PRIVILEGE_PRIVILEGED, MODE_CONFIG, NULL);
      cli_register_command(cli, c2, "access-list", cmd_no_ip_access_list, PRIVILEGE_PRIVILEGED, MODE_CONFIG, "Remove named access-list");

      // Enable regular processing
      cli_regular(cli, regular_stuff);

      if (!(f = fopen(CLIUSERS, "r")))
      {
            LOG(0, 0, 0, "WARNING! No users specified. Command-line access is open to all\n");
      }
      else
      {
            while (fgets(buf, 4096, f))
            {
                  char *p;
                  if (*buf == '#') continue;
                  if ((p = strchr(buf, '\r'))) *p = 0;
                  if ((p = strchr(buf, '\n'))) *p = 0;
                  if (!*buf) continue;
                  if (!(p = strchr((char *)buf, ':'))) continue;
                  *p++ = 0;
                  if (!strcmp(buf, "enable"))
                  {
                        cli_allow_enable(cli, p);
                        LOG(3, 0, 0, "Setting enable password\n");
                  }
                  else
                  {
                        cli_allow_user(cli, buf, p);
                        LOG(3, 0, 0, "Allowing user %s to connect to the CLI\n", buf);
                  }
            }
            fclose(f);
      }

      memset(&addr, 0, sizeof(addr));
      clifd = socket(PF_INET, SOCK_STREAM, 6);
      setsockopt(clifd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
      {
            int flags;
            // Set cli fd as non-blocking
            flags = fcntl(clifd, F_GETFL, 0);
            fcntl(clifd, F_SETFL, flags | O_NONBLOCK);
      }
      addr.sin_family = AF_INET;
      addr.sin_port = htons(23);
      if (bind(clifd, (void *) &addr, sizeof(addr)) < 0)
      {
            LOG(0, 0, 0, "Error listening on cli port 23: %s\n", strerror(errno));
            return;
      }
      listen(clifd, 10);
}

void cli_do(int sockfd)
{
      int require_auth = 1;
      struct sockaddr_in addr;
      socklen_t l = sizeof(addr);

      if (fork_and_close()) return;
      if (getpeername(sockfd, (struct sockaddr *) &addr, &l) == 0)
      {
            require_auth = addr.sin_addr.s_addr != inet_addr("127.0.0.1");
            LOG(require_auth ? 3 : 4, 0, 0, "Accepted connection to CLI from %s\n",
                  fmtaddr(addr.sin_addr.s_addr, 0));
      }
      else
            LOG(0, 0, 0, "getpeername() failed on cli socket.  Requiring authentication: %s\n", strerror(errno));

      if (require_auth)
      {
            LOG(3, 0, 0, "CLI is remote, requiring authentication\n");
            if (!cli->users) /* paranoia */
            {
                  LOG(0, 0, 0, "No users for remote authentication!  Exiting CLI\n");
                  exit(0);
            }
      }
      else
      {
            /* no username/pass required */
            cli->users = 0;
      }

#ifdef RINGBUFFER
      debug_rb_tail = ringbuffer->tail;
#endif
      memset(&debug_flags, 0, sizeof(debug_flags));
      debug_flags.critical = 1;

      cli_loop(cli, sockfd);

      close(sockfd);
      LOG(require_auth ? 3 : 4, 0, 0, "Closed CLI connection from %s\n",
            fmtaddr(addr.sin_addr.s_addr, 0));

      exit(0);
}

static void cli_print_log(struct cli_def *cli, char *string)
{
      LOG(3, 0, 0, "%s\n", string);
}

void cli_do_file(FILE *fh)
{
      LOG(3, 0, 0, "Reading configuration file\n");
      cli_print_callback(cli, cli_print_log);
      cli_file(cli, fh, PRIVILEGE_PRIVILEGED, MODE_CONFIG);
      cli_print_callback(cli, NULL);
}

int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...)
{
      va_list ap;
      char *desc;
      char buf[16];
      char *p;

      va_start(ap, entry);
      while (entry)
      {
            /* allow one %d */
            if ((p = strchr(entry, '%')) && !strchr(p+1, '%') && p[1] == 'd')
            {
                  int v = va_arg(ap, int);
                  snprintf(buf, sizeof(buf), entry, v);
                  p = buf;
            }
            else
                  p = entry;

            desc = va_arg(ap, char *);
            if (desc && *desc)
                  cli_error(cli, "  %-20s %s", p, desc);
            else
                  cli_error(cli, "  %s", p);

            entry = desc ? va_arg(ap, char *) : 0;
      }

      va_end(ap);
      if (cr_ok)
            cli_error(cli, "  <cr>");

      return CLI_OK;
}

static int cmd_show_session(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i;

      if (CLI_HELP_REQUESTED)
            return cli_arg_help(cli, 1,
                  "<1-%d>", MAXSESSION-1, "Show specific session by id",
                  NULL);

      time(&time_now);
      if (argc > 0)
      {
            // Show individual session
            for (i = 0; i < argc; i++)
            {
                  unsigned int s, b_in, b_out;
                  s = atoi(argv[i]);
                  if (s <= 0 || s >= MAXSESSION)
                  {
                        cli_print(cli, "Invalid session id \"%s\"", argv[i]);
                        continue;
                  }
                  cli_print(cli, "\r\nSession %d:", s);
                  cli_print(cli, "\tUser:\t\t%s", session[s].user[0] ? session[s].user : "none");
                  cli_print(cli, "\tCalling Num:\t%s", session[s].calling);
                  cli_print(cli, "\tCalled Num:\t%s", session[s].called);
                  cli_print(cli, "\tTunnel ID:\t%d", session[s].tunnel);
                  cli_print(cli, "\tPPP Phase:\t%s", ppp_phase(session[s].ppp.phase));
                  switch (session[s].ppp.phase)
                  {
                  case Establish:
                        cli_print(cli, "\t LCP state:\t%s", ppp_state(session[s].ppp.lcp));
                        break;

                  case Authenticate:
                  case Network:
                        cli_print(cli, "\t IPCP state:\t%s", ppp_state(session[s].ppp.ipcp));
                        cli_print(cli, "\t IPV6CP state:\t%s", ppp_state(session[s].ppp.ipv6cp));
                        cli_print(cli, "\t CCP state:\t%s", ppp_state(session[s].ppp.ccp));
                  }
                  cli_print(cli, "\tIP address:\t%s", fmtaddr(htonl(session[s].ip), 0));
                  cli_print(cli, "\tUnique SID:\t%u", session[s].unique_id);
                  cli_print(cli, "\tOpened:\t\t%u seconds", session[s].opened ? abs(time_now - session[s].opened) : 0);
                  cli_print(cli, "\tIdle time:\t%u seconds", session[s].last_packet ? abs(time_now - session[s].last_packet) : 0);
                  cli_print(cli, "\tBytes In/Out:\t%u/%u", session[s].cout, session[s].cin);
                  cli_print(cli, "\tPkts In/Out:\t%u/%u", session[s].pout, session[s].pin);
                  cli_print(cli, "\tMRU:\t\t%d", session[s].mru);
                  cli_print(cli, "\tRx Speed:\t%u", session[s].rx_connect_speed);
                  cli_print(cli, "\tTx Speed:\t%u", session[s].tx_connect_speed);
                  if (session[s].filter_in && session[s].filter_in <= MAXFILTER)
                        cli_print(cli, "\tFilter in:\t%u (%s)", session[s].filter_in, ip_filters[session[s].filter_in - 1].name);
                  if (session[s].filter_out && session[s].filter_out <= MAXFILTER)
                        cli_print(cli, "\tFilter out:\t%u (%s)", session[s].filter_out, ip_filters[session[s].filter_out - 1].name);
                  if (session[s].snoop_ip && session[s].snoop_port)
                        cli_print(cli, "\tIntercepted:\t%s:%d", fmtaddr(session[s].snoop_ip, 0), session[s] .snoop_port);
                  else
                        cli_print(cli, "\tIntercepted:\tno");

                  cli_print(cli, "\tWalled Garden:\t%s", session[s].walled_garden ? "YES" : "no");
                  {
                        int t = (session[s].throttle_in || session[s].throttle_out);
                        cli_print(cli, "\tThrottled:\t%s%s%.0d%s%s%.0d%s%s",
                              t ? "YES" : "no", t ? " (" : "",
                              session[s].throttle_in, session[s].throttle_in ? "kbps" : t ? "-" : "",
                              t ? "/" : "",
                              session[s].throttle_out, session[s].throttle_out ? "kbps" : t ? "-" : "",
                              t ? ")" : "");
                  }

                  b_in = session[s].tbf_in;
                  b_out = session[s].tbf_out;
                  if (b_in || b_out)
                        cli_print(cli, "\t\t\t%5s %6s %6s | %7s %7s %8s %8s %8s %8s",
                              "Rate", "Credit", "Queued", "ByteIn", "PackIn",
                              "ByteSent", "PackSent", "PackDrop", "PackDelay");

                  if (b_in)
                        cli_print(cli, "\tTBFI#%d%1s%s\t%5d %6d %6d | %7d %7d %8d %8d %8d %8d",
                              b_in,
                              (filter_list[b_in].next ? "*" : " "),
                              (b_in < 100 ? "\t" : ""),
                              filter_list[b_in].rate * 8,
                              filter_list[b_in].credit,
                              filter_list[b_in].queued,
                              filter_list[b_in].b_queued,
                              filter_list[b_in].p_queued,
                              filter_list[b_in].b_sent,
                              filter_list[b_in].p_sent,
                              filter_list[b_in].p_dropped,
                              filter_list[b_in].p_delayed);

                  if (b_out)
                        cli_print(cli, "\tTBFO#%d%1s%s\t%5d %6d %6d | %7d %7d %8d %8d %8d %8d",
                              b_out,
                              (filter_list[b_out].next ? "*" : " "),
                              (b_out < 100 ? "\t" : ""),
                              filter_list[b_out].rate * 8,
                              filter_list[b_out].credit,
                              filter_list[b_out].queued,
                              filter_list[b_out].b_queued,
                              filter_list[b_out].p_queued,
                              filter_list[b_out].b_sent,
                              filter_list[b_out].p_sent,
                              filter_list[b_out].p_dropped,
                              filter_list[b_out].p_delayed);

            }
            return CLI_OK;
      }

      // Show Summary
      cli_print(cli, "%5s %4s %-32s %-15s %s %s %s %s %10s %10s %10s %4s %-15s %s",
                  "SID",
                  "TID",
                  "Username",
                  "IP",
                  "I",
                  "T",
                  "G",
                  "6",
                  "opened",
                  "downloaded",
                  "uploaded",
                  "idle",
                  "LAC",
                  "CLI");

      for (i = 1; i < MAXSESSION; i++)
      {
            if (!session[i].opened) continue;
            cli_print(cli, "%5d %4d %-32s %-15s %s %s %s %s %10u %10lu %10lu %4u %-15s %s",
                        i,
                        session[i].tunnel,
                        session[i].user[0] ? session[i].user : "*",
                        fmtaddr(htonl(session[i].ip), 0),
                        (session[i].snoop_ip && session[i].snoop_port) ? "Y" : "N",
                        (session[i].throttle_in || session[i].throttle_out) ? "Y" : "N",
                        (session[i].walled_garden) ? "Y" : "N",
                        (session[i].ppp.ipv6cp == Opened) ? "Y" : "N",
                        abs(time_now - (unsigned long)session[i].opened),
                        (unsigned long)session[i].cout,
                        (unsigned long)session[i].cin,
                        abs(time_now - (session[i].last_packet ? session[i].last_packet : time_now)),
                        fmtaddr(htonl(tunnel[ session[i].tunnel ].ip), 1),
                        session[i].calling[0] ? session[i].calling : "*");
      }
      return CLI_OK;
}

static int cmd_show_tunnels(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i, x, show_all = 0;
      char *states[] = {
            "Free",
            "Open",
            "Closing",
            "Opening",
      };

      if (CLI_HELP_REQUESTED)
      {
            if (argc > 1)
                  return cli_arg_help(cli, 1,
                        "<1-%d>", MAXTUNNEL-1, "Show specific tunnel by id",
                        NULL);

            return cli_arg_help(cli, 1,
                  "all", "Show all tunnels, including unused",
                  "<1-%d>", MAXTUNNEL-1, "Show specific tunnel by id",
                  NULL);
      }

      time(&time_now);
      if (argc > 0)
      {
            if (strcmp(argv[0], "all") == 0)
            {
                  show_all = 1;
            }
            else
            {
                  // Show individual tunnel
                  for (i = 0; i < argc; i++)
                  {
                        char s[65535] = {0};
                        unsigned int t;
                        t = atoi(argv[i]);
                        if (t <= 0 || t >= MAXTUNNEL)
                        {
                              cli_print(cli, "Invalid tunnel id \"%s\"", argv[i]);
                              continue;
                        }
                        cli_print(cli, "\r\nTunnel %d:", t);
                        cli_print(cli, "\tState:\t\t%s", states[tunnel[t].state]);
                        cli_print(cli, "\tHostname:\t%s", tunnel[t].hostname[0] ? tunnel[t].hostname : "(none)");
                        cli_print(cli, "\tRemote IP:\t%s", fmtaddr(htonl(tunnel[t].ip), 0));
                        cli_print(cli, "\tRemote Port:\t%d", tunnel[t].port);
                        cli_print(cli, "\tRx Window:\t%u", tunnel[t].window);
                        cli_print(cli, "\tNext Recv:\t%u", tunnel[t].nr);
                        cli_print(cli, "\tNext Send:\t%u", tunnel[t].ns);
                        cli_print(cli, "\tQueue Len:\t%u", tunnel[t].controlc);
                        cli_print(cli, "\tLast Packet Age:%u", (unsigned)(time_now - tunnel[t].last));

                        for (x = 0; x < MAXSESSION; x++)
                              if (session[x].tunnel == t && session[x].opened && !session[x].die)
                                    sprintf(s, "%s%u ", s, x);

                        cli_print(cli, "\tSessions:\t%s", s);
                  }
                  return CLI_OK;
            }
      }

      // Show tunnel summary
      cli_print(cli, "%4s %20s %20s %6s %s",
                  "TID",
                  "Hostname",
                  "IP",
                  "State",
                  "Sessions");

      for (i = 1; i < MAXTUNNEL; i++)
      {
            int sessions = 0;
            if (!show_all && (!tunnel[i].ip || tunnel[i].die)) continue;

            for (x = 0; x < MAXSESSION; x++) if (session[x].tunnel == i && session[x].opened && !session[x].die) sessions++;
            cli_print(cli, "%4d %20s %20s %6s %6d",
                        i,
                        *tunnel[i].hostname ? tunnel[i].hostname : "(null)",
                        fmtaddr(htonl(tunnel[i].ip), 0),
                        states[tunnel[i].state],
                        sessions);
      }

      return CLI_OK;
}

static int cmd_show_users(struct cli_def *cli, char *command, char **argv, int argc)
{
      char sid[32][8];
      char *sargv[32];
      int sargc = 0;
      int i;

      if (CLI_HELP_REQUESTED)
            return cli_arg_help(cli, 1,
                  "USER", "Show details for specific username",
                  NULL);

      for (i = 0; i < MAXSESSION; i++)
      {
            if (!session[i].opened) continue;
            if (!session[i].user[0]) continue;
            if (argc > 0)
            {
                  int j;
                  for (j = 0; j < argc && sargc < 32; j++)
                  {
                        if (strcmp(argv[j], session[i].user) == 0)
                        {
                              snprintf(sid[sargc], sizeof(sid[0]), "%d", i);
                              sargv[sargc] = sid[sargc];
                              sargc++;
                        }
                  }

                  continue;
            }

            cli_print(cli, "%s", session[i].user);
      }

      if (sargc > 0)
            return cmd_show_session(cli, "users", sargv, sargc);

      return CLI_OK;
}

#ifdef STATISTICS
static int cmd_show_counters(struct cli_def *cli, char *command, char **argv, int argc)
{
      if (CLI_HELP_REQUESTED)
            return CLI_HELP_NO_ARGS;

      cli_print(cli, "%-10s %10s %10s %10s %10s", "Ethernet", "Bytes", "Packets", "Errors", "Dropped");
      cli_print(cli, "%-10s %10u %10u %10u %10u", "RX",
                  GET_STAT(tun_rx_bytes),
                  GET_STAT(tun_rx_packets),
                  GET_STAT(tun_rx_errors),
                  GET_STAT(tun_rx_dropped));
      cli_print(cli, "%-10s %10u %10u %10u", "TX",
                  GET_STAT(tun_tx_bytes),
                  GET_STAT(tun_tx_packets),
                  GET_STAT(tun_tx_errors));
      cli_print(cli, "");

      cli_print(cli, "%-10s %10s %10s %10s %10s", "Tunnel", "Bytes", "Packets", "Errors", "Retries");
      cli_print(cli, "%-10s %10u %10u %10u", "RX",
                  GET_STAT(tunnel_rx_bytes),
                  GET_STAT(tunnel_rx_packets),
                  GET_STAT(tunnel_rx_errors));
      cli_print(cli, "%-10s %10u %10u %10u %10u", "TX",
                  GET_STAT(tunnel_tx_bytes),
                  GET_STAT(tunnel_tx_packets),
                  GET_STAT(tunnel_tx_errors),
                  GET_STAT(tunnel_retries));
      cli_print(cli, "");

      cli_print(cli, "%-30s%-10s", "Counter", "Value");
      cli_print(cli, "-----------------------------------------");
      cli_print(cli, "%-30s%u", "radius_retries",           GET_STAT(radius_retries));
      cli_print(cli, "%-30s%u", "arp_sent",                 GET_STAT(arp_sent));
      cli_print(cli, "%-30s%u", "packets_snooped",          GET_STAT(packets_snooped));
      cli_print(cli, "%-30s%u", "tunnel_created",           GET_STAT(tunnel_created));
      cli_print(cli, "%-30s%u", "session_created",          GET_STAT(session_created));
      cli_print(cli, "%-30s%u", "tunnel_timeout",           GET_STAT(tunnel_timeout));
      cli_print(cli, "%-30s%u", "session_timeout",          GET_STAT(session_timeout));
      cli_print(cli, "%-30s%u", "radius_timeout",           GET_STAT(radius_timeout));
      cli_print(cli, "%-30s%u", "radius_overflow",          GET_STAT(radius_overflow));
      cli_print(cli, "%-30s%u", "tunnel_overflow",          GET_STAT(tunnel_overflow));
      cli_print(cli, "%-30s%u", "session_overflow",         GET_STAT(session_overflow));
      cli_print(cli, "%-30s%u", "ip_allocated",       GET_STAT(ip_allocated));
      cli_print(cli, "%-30s%u", "ip_freed",                 GET_STAT(ip_freed));
      cli_print(cli, "%-30s%u", "cluster_forwarded",        GET_STAT(c_forwarded));
      cli_print(cli, "%-30s%u", "recv_forward",       GET_STAT(recv_forward));
      cli_print(cli, "%-30s%u", "select_called",            GET_STAT(select_called));
      cli_print(cli, "%-30s%u", "multi_read_used",          GET_STAT(multi_read_used));
      cli_print(cli, "%-30s%u", "multi_read_exceeded",      GET_STAT(multi_read_exceeded));


#ifdef STAT_CALLS
      cli_print(cli, "\n%-30s%-10s", "Counter", "Value");
      cli_print(cli, "-----------------------------------------");
      cli_print(cli, "%-30s%u", "call_processtun",          GET_STAT(call_processtun));
      cli_print(cli, "%-30s%u", "call_processipout",        GET_STAT(call_processipout));
      cli_print(cli, "%-30s%u", "call_processipv6out",      GET_STAT(call_processipv6out));
      cli_print(cli, "%-30s%u", "call_processudp",          GET_STAT(call_processudp));
      cli_print(cli, "%-30s%u", "call_processpap",          GET_STAT(call_processpap));
      cli_print(cli, "%-30s%u", "call_processchap",         GET_STAT(call_processchap));
      cli_print(cli, "%-30s%u", "call_processlcp",          GET_STAT(call_processlcp));
      cli_print(cli, "%-30s%u", "call_processipcp",         GET_STAT(call_processipcp));
      cli_print(cli, "%-30s%u", "call_processipv6cp",       GET_STAT(call_processipv6cp));
      cli_print(cli, "%-30s%u", "call_processipin",         GET_STAT(call_processipin));
      cli_print(cli, "%-30s%u", "call_processipv6in",       GET_STAT(call_processipv6in));
      cli_print(cli, "%-30s%u", "call_processccp",          GET_STAT(call_processccp));
      cli_print(cli, "%-30s%u", "call_processrad",          GET_STAT(call_processrad));
      cli_print(cli, "%-30s%u", "call_sendarp",       GET_STAT(call_sendarp));
      cli_print(cli, "%-30s%u", "call_sendipcp",            GET_STAT(call_sendipcp));
      cli_print(cli, "%-30s%u", "call_sendchap",            GET_STAT(call_sendchap));
      cli_print(cli, "%-30s%u", "call_sessionbyip",         GET_STAT(call_sessionbyip));
      cli_print(cli, "%-30s%u", "call_sessionbyipv6",       GET_STAT(call_sessionbyipv6));
      cli_print(cli, "%-30s%u", "call_sessionbyuser",       GET_STAT(call_sessionbyuser));
      cli_print(cli, "%-30s%u", "call_tunnelsend",          GET_STAT(call_tunnelsend));
      cli_print(cli, "%-30s%u", "call_tunnelkill",          GET_STAT(call_tunnelkill));
      cli_print(cli, "%-30s%u", "call_tunnelshutdown",      GET_STAT(call_tunnelshutdown));
      cli_print(cli, "%-30s%u", "call_sessionkill",         GET_STAT(call_sessionkill));
      cli_print(cli, "%-30s%u", "call_sessionshutdown",     GET_STAT(call_sessionshutdown));
      cli_print(cli, "%-30s%u", "call_sessionsetup",        GET_STAT(call_sessionsetup));
      cli_print(cli, "%-30s%u", "call_assign_ip_address",   GET_STAT(call_assign_ip_address));
      cli_print(cli, "%-30s%u", "call_free_ip_address",     GET_STAT(call_free_ip_address));
      cli_print(cli, "%-30s%u", "call_dump_acct_info",      GET_STAT(call_dump_acct_info));
      cli_print(cli, "%-30s%u", "call_radiussend",          GET_STAT(call_radiussend));
      cli_print(cli, "%-30s%u", "call_radiusretry",         GET_STAT(call_radiusretry));
      cli_print(cli, "%-30s%u", "call_random_data",         GET_STAT(call_random_data));
#endif /* STAT_CALLS */

      {
            time_t l = GET_STAT(last_reset);
            char *t = ctime(&l);
            char *p = strchr(t, '\n');
            if (p) *p = 0;

            cli_print(cli, "");
            cli_print(cli, "Last counter reset %s", t);
      }

      return CLI_OK;
}

static int cmd_clear_counters(struct cli_def *cli, char *command, char **argv, int argc)
{
      if (CLI_HELP_REQUESTED)
            return CLI_HELP_NO_ARGS;

      memset(_statistics, 0, sizeof(struct Tstats));
      SET_STAT(last_reset, time(NULL));

      cli_print(cli, "Counters cleared");
      return CLI_OK;
}
#endif /* STATISTICS */

static int cmd_show_version(struct cli_def *cli, char *command, char **argv, int argc)
{
      int tag = 0;
      int file = 0;
      int i = 0;

      if (CLI_HELP_REQUESTED)
            return cli_arg_help(cli, 1,
                  "tag", "Include CVS release tag",
                  "file", "Include file versions",
                  NULL);

      for (i = 0; i < argc; i++)
            if (!strcmp(argv[i], "tag"))
                  tag++;
            else if (!strcmp(argv[i], "file"))
                  file++;

      cli_print(cli, "L2TPNS %s", VERSION);
      if (tag)
      {
            char const *p = strchr(cvs_name, ':');
            char const *e;
            if (p)
            {
                  p++;
                  while (isspace(*p))
                        p++;
            }

            if (!p || *p == '$')
                  p = "HEAD";

            e = strpbrk(p, " \t$");
            cli_print(cli, "Tag: %.*s", (int) (e ? e - p + 1 : strlen(p)), p);
      }
      
      if (file)
      {
            extern linked_list *loaded_plugins;
            void *p;

            cli_print(cli, "Files:");
            cli_print(cli, "  %s", cvs_id_arp);
#ifdef BGP
            cli_print(cli, "  %s", cvs_id_bgp);
#endif /* BGP */
            cli_print(cli, "  %s", cvs_id_cli);
            cli_print(cli, "  %s", cvs_id_cluster);
            cli_print(cli, "  %s", cvs_id_constants);
            cli_print(cli, "  %s", cvs_id_control);
            cli_print(cli, "  %s", cvs_id_icmp);
            cli_print(cli, "  %s", cvs_id_l2tpns);
            cli_print(cli, "  %s", cvs_id_ll);
            cli_print(cli, "  %s", cvs_id_ppp);
            cli_print(cli, "  %s", cvs_id_radius);
            cli_print(cli, "  %s", cvs_id_tbf);
            cli_print(cli, "  %s", cvs_id_util);

            ll_reset(loaded_plugins);
            while ((p = ll_next(loaded_plugins)))
            {
                  char const **id = dlsym(p, "cvs_id");
                  if (id)
                        cli_print(cli, "  %s", *id);
            }
      }

      return CLI_OK;
}

static int cmd_show_pool(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i;
      int used = 0, free = 0, show_all = 0;

      if (!config->cluster_iam_master)
      {
            cli_print(cli, "Can't do this on a slave.  Do it on %s",
                  fmtaddr(config->cluster_master_address, 0));

            return CLI_OK;
      }

      if (CLI_HELP_REQUESTED)
      {
            if (argc > 1)
                  return cli_arg_help(cli, 1, NULL);

            return cli_arg_help(cli, 1,
                  "all", "Show all pool addresses, including unused",
                  NULL);
      }

      if (argc > 0 && strcmp(argv[0], "all") == 0)
            show_all = 1;

      time(&time_now);
      cli_print(cli, "%-15s %4s %8s %s", "IP Address", "Used", "Session", "User");
      for (i = 0; i < MAXIPPOOL; i++)
      {
            if (!ip_address_pool[i].address) continue;
            if (ip_address_pool[i].assigned)
            {
                  cli_print(cli, "%-15s\tY %8d %s",
                        fmtaddr(htonl(ip_address_pool[i].address), 0),
                        ip_address_pool[i].session,
                        session[ip_address_pool[i].session].user);

                  used++;
            }
            else
            {
                  if (ip_address_pool[i].last)
                        cli_print(cli, "%-15s\tN %8s [%s] %ds",
                              fmtaddr(htonl(ip_address_pool[i].address), 0), "",
                              ip_address_pool[i].user, (int) time_now - ip_address_pool[i].last);

                  else if (show_all)
                        cli_print(cli, "%-15s\tN", fmtaddr(htonl(ip_address_pool[i].address), 0));

                  free++;
            }
      }

      if (!show_all)
            cli_print(cli, "(Not displaying unused addresses)");

      cli_print(cli, "\r\nFree: %d\r\nUsed: %d", free, used);
      return CLI_OK;
}

static FILE *save_config_fh = 0;
static void print_save_config(struct cli_def *cli, char *string)
{
      if (save_config_fh)
            fprintf(save_config_fh, "%s\n", string);
}

static int cmd_write_memory(struct cli_def *cli, char *command, char **argv, int argc)
{
      if (CLI_HELP_REQUESTED)
            return CLI_HELP_NO_ARGS;

      if ((save_config_fh = fopen(config->config_file, "w")))
      {
            cli_print(cli, "Writing configuration");
            cli_print_callback(cli, print_save_config);
            cmd_show_run(cli, command, argv, argc);
            cli_print_callback(cli, NULL);
            fclose(save_config_fh);
            save_config_fh = 0;
      }
      else
      {
            cli_error(cli, "Error writing configuration: %s", strerror(errno));
      }
      return CLI_OK;
}

static char const *show_access_list_rule(int extended, ip_filter_rulet *rule);

static int cmd_show_run(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i;
      char ipv6addr[INET6_ADDRSTRLEN];

      if (CLI_HELP_REQUESTED)
            return CLI_HELP_NO_ARGS;

      cli_print(cli, "# Current configuration:");

      for (i = 0; config_values[i].key; i++)
      {
            void *value = ((void *)config) + config_values[i].offset;
            if (config_values[i].type == STRING)
                  cli_print(cli, "set %s \"%.*s\"", config_values[i].key, config_values[i].size, (char *) value);
            else if (config_values[i].type == IPv4)
                  cli_print(cli, "set %s %s", config_values[i].key, fmtaddr(*(in_addr_t *) value, 0));
            else if (config_values[i].type == IPv6)
                  cli_print(cli, "set %s %s", config_values[i].key, inet_ntop(AF_INET6, value, ipv6addr, INET6_ADDRSTRLEN));
            else if (config_values[i].type == SHORT)
                  cli_print(cli, "set %s %hu", config_values[i].key, *(short *) value);
            else if (config_values[i].type == BOOL)
                  cli_print(cli, "set %s %s", config_values[i].key, (*(int *) value) ? "yes" : "no");
            else if (config_values[i].type == INT)
                  cli_print(cli, "set %s %d", config_values[i].key, *(int *) value);
            else if (config_values[i].type == UNSIGNED_LONG)
                  cli_print(cli, "set %s %lu", config_values[i].key, *(unsigned long *) value);
      }

      cli_print(cli, "# Plugins");
      for (i = 0; i < MAXPLUGINS; i++)
      {
            if (*config->plugins[i])
            {
                  cli_print(cli, "load plugin \"%s\"", config->plugins[i]);
            }
      }

#ifdef BGP
      if (config->as_number)
      {
            int k;
            int h;

            cli_print(cli, "# BGP");
            cli_print(cli, "router bgp %u", config->as_number);
            for (i = 0; i < BGP_NUM_PEERS; i++)
            {
                  if (!config->neighbour[i].name[0])
                        continue;

                  cli_print(cli, " neighbour %s remote-as %u", config->neighbour[i].name, config->neighbour[i].as);

                  k = config->neighbour[i].keepalive;
                  h = config->neighbour[i].hold;

                  if (k == -1)
                  {
                        if (h == -1)
                              continue;

                        k = BGP_KEEPALIVE_TIME;
                  }

                  if (h == -1)
                        h = BGP_HOLD_TIME;

                  cli_print(cli, " neighbour %s timers %d %d", config->neighbour[i].name, k, h);
            }
      }
#endif

      cli_print(cli, "# Filters");
      for (i = 0; i < MAXFILTER; i++)
      {
            ip_filter_rulet *rules;
            if (!*ip_filters[i].name)
                  continue;

            cli_print(cli, "ip access-list %s %s",
                  ip_filters[i].extended ? "extended" : "standard",
                  ip_filters[i].name);

            rules = ip_filters[i].rules;
            while (rules->action)
                  cli_print(cli, "%s", show_access_list_rule(ip_filters[i].extended, rules++));
      }

      cli_print(cli, "# end");
      return CLI_OK;
}

static int cmd_show_radius(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i, free = 0, used = 0, show_all = 0;
      char *states[] = {
            "NULL",
            "CHAP",
            "AUTH",
            "IPCP",
            "START",
            "STOP",
            "INTRM",
            "WAIT",
      };

      if (CLI_HELP_REQUESTED)
      {
            if (argc > 1)
                  return cli_arg_help(cli, 1, NULL);

            return cli_arg_help(cli, 1,
                  "all", "Show all RADIUS sessions, including unused",
                  NULL);
      }

      cli_print(cli, "%6s%7s%5s%6s%9s%9s%4s", "ID", "Radius", "Sock", "State", "Session", "Retry", "Try");

      time(&time_now);

      if (argc > 0 && strcmp(argv[0], "all") == 0)
            show_all = 1;

      for (i = 1; i < MAXRADIUS; i++)
      {
            if (radius[i].state == RADIUSNULL)
                  free++;
            else
                  used++;

            if (!show_all && radius[i].state == RADIUSNULL) continue;

            cli_print(cli, "%6d%7d%5d%6s%9d%9u%4d",
                        i,
                        i >> RADIUS_SHIFT,
                        i & RADIUS_MASK,
                        states[radius[i].state],
                        radius[i].session,
                        radius[i].retry,
                        radius[i].try);
      }

      cli_print(cli, "\r\nFree: %d\r\nUsed: %d", free, used);

      return CLI_OK;
}

static int cmd_show_plugins(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i;

      if (CLI_HELP_REQUESTED)
            return CLI_HELP_NO_ARGS;

      cli_print(cli, "Plugins currently loaded:");
      for (i = 0; i < MAXPLUGINS; i++)
            if (*config->plugins[i])
                  cli_print(cli, "  %s", config->plugins[i]);

      return CLI_OK;
}

static int cmd_show_throttle(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i;

      if (CLI_HELP_REQUESTED)
            return CLI_HELP_NO_ARGS;

      cli_print(cli, "%5s %4s %-32s %7s %6s %6s %6s",
                  "SID",
                  "TID",
                  "Username",
                  "Rate In",
                  "Out",
                  "TBFI",
                  "TBFO");

      for (i = 0; i < MAXSESSION; i++)
      {
            if (session[i].throttle_in || session[i].throttle_out)
                  cli_print(cli, "%5d %4d %-32s  %6d %6d %6d %6d",
                        i,
                        session[i].tunnel,
                        session[i].user,
                        session[i].throttle_in,
                        session[i].throttle_out,
                        session[i].tbf_in,
                        session[i].tbf_out);
      }

      return CLI_OK;
}

static int cmd_show_banana(struct cli_def *cli, char *command, char **argv, int argc)
{
      if (CLI_HELP_REQUESTED)
            return CLI_HELP_NO_ARGS;

      cli_print(cli,    " _\n"
                  "//\\\n"
                  "V  \\\n"
                  " \\  \\_\n"
                  "  \\,'.`-.\n"
                  "   |\\ `. `.\n"
                  "   ( \\  `. `-.                        _,.-:\\\n"
                  "    \\ \\   `.  `-._             __..--' ,-';/\n"
                  "     \\ `.   `-.   `-..___..---'   _.--' ,'/\n"
                  "      `. `.    `-._        __..--'    ,' /\n"
                  "        `. `-_     ``--..''       _.-' ,'\n"
                  "          `-_ `-.___        __,--'   ,'\n"
                  "             `-.__  `----\"\"\"    __.-'\n"
                  "hh                `--..____..--'");

      return CLI_OK;
}

static int cmd_drop_user(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i;
      sessionidt s;

      if (CLI_HELP_REQUESTED)
            return cli_arg_help(cli, argc > 1,
                  "USER", "Username of session to drop", NULL);

      if (!config->cluster_iam_master)
      {
            cli_error(cli, "Can't do this on a slave.  Do it on %s",
                  fmtaddr(config->cluster_master_address, 0));

            return CLI_OK;
      }

      if (!argc)
      {
            cli_error(cli, "Specify a user to drop");
            return CLI_OK;
      }

      for (i = 0; i < argc; i++)
      {
            if (!(s = sessionbyuser(argv[i])))
            {
                  cli_error(cli, "User %s is not connected", argv[i]);
                  continue;
            }

            if (session[s].ip && session[s].opened && !session[s].die)
            {
                  cli_print(cli, "Dropping user %s", session[s].user);
                  cli_session_actions[s].action |= CLI_SESS_KILL;
            }
      }

      return CLI_OK;
}

static int cmd_drop_tunnel(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i;
      tunnelidt t;

      if (CLI_HELP_REQUESTED)
            return cli_arg_help(cli, argc > 1,
                  "<1-%d>", MAXTUNNEL-1, "Tunnel id to drop", NULL);

      if (!config->cluster_iam_master)
      {
            cli_error(cli, "Can't do this on a slave.  Do it on %s",
                  fmtaddr(config->cluster_master_address, 0));

            return CLI_OK;
      }

      if (!argc)
      {
            cli_error(cli, "Specify a tunnel to drop");
            return CLI_OK;
      }

      for (i = 0; i < argc; i++)
      {
            if ((t = atol(argv[i])) <= 0 || (t >= MAXTUNNEL))
            {
                  cli_error(cli, "Invalid tunnel ID (1-%d)", MAXTUNNEL-1);
                  continue;
            }

            if (!tunnel[t].ip)
            {
                  cli_error(cli, "Tunnel %d is not connected", t);
                  continue;
            }

            if (tunnel[t].die)
            {
                  cli_error(cli, "Tunnel %d is already being shut down", t);
                  continue;
            }

            cli_print(cli, "Tunnel %d shut down (%s)", t, tunnel[t].hostname);
            cli_tunnel_actions[t].action |= CLI_TUN_KILL;
      }

      return CLI_OK;
}

static int cmd_drop_session(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i;
      sessionidt s;

      if (CLI_HELP_REQUESTED)
            return cli_arg_help(cli, argc > 1,
                  "<1-%d>", MAXSESSION-1, "Session id to drop", NULL);

      if (!config->cluster_iam_master)
      {
            cli_error(cli, "Can't do this on a slave.  Do it on %s",
                  fmtaddr(config->cluster_master_address, 0));

            return CLI_OK;
      }

      if (!argc)
      {
            cli_error(cli, "Specify a session id to drop");
            return CLI_OK;
      }

      for (i = 0; i < argc; i++)
      {
            if ((s = atol(argv[i])) <= 0 || (s > MAXSESSION))
            {
                  cli_error(cli, "Invalid session ID (1-%d)", MAXSESSION-1);
                  continue;
            }

            if (session[s].ip && session[s].opened && !session[s].die)
            {
                  cli_print(cli, "Dropping session %d", s);
                  cli_session_actions[s].action |= CLI_SESS_KILL;
            }
            else
            {
                  cli_error(cli, "Session %d is not active.", s);
            }
      }

      return CLI_OK;
}

static int cmd_snoop(struct cli_def *cli, char *command, char **argv, int argc)
{
      in_addr_t ip;
      uint16_t port;
      sessionidt s;

      if (CLI_HELP_REQUESTED)
      {
            switch (argc)
            {
            case 1:
                  return cli_arg_help(cli, 0,
                        "USER", "Username of session to snoop", NULL);

            case 2:
                  return cli_arg_help(cli, 0,
                        "A.B.C.D", "IP address of snoop destination", NULL);

            case 3:
                  return cli_arg_help(cli, 0,
                        "N", "Port of snoop destination", NULL);

            case 4:
                  if (!argv[3][1])
                        return cli_arg_help(cli, 1, NULL);

            default:
                  return CLI_OK;
            }
      }

      if (!config->cluster_iam_master)
      {
            cli_error(cli, "Can't do this on a slave.  Do it on %s",
                  fmtaddr(config->cluster_master_address, 0));

            return CLI_OK;
      }

      if (argc < 3)
      {
            cli_error(cli, "Specify username, ip and port");
            return CLI_OK;
      }

      if (!(s = sessionbyuser(argv[0])))
      {
            cli_error(cli, "User %s is not connected", argv[0]);
            return CLI_OK;
      }

      ip = inet_addr(argv[1]);
      if (!ip || ip == INADDR_NONE)
      {
            cli_error(cli, "Cannot parse IP \"%s\"", argv[1]);
            return CLI_OK;
      }

      port = atoi(argv[2]);
      if (!port)
      {
            cli_error(cli, "Invalid port %s", argv[2]);
            return CLI_OK;
      }

      cli_print(cli, "Snooping user %s to %s:%d", argv[0], fmtaddr(ip, 0), port);
      cli_session_actions[s].snoop_ip = ip;
      cli_session_actions[s].snoop_port = port;
      cli_session_actions[s].action |= CLI_SESS_SNOOP;

      return CLI_OK;
}

static int cmd_no_snoop(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i;
      sessionidt s;

      if (CLI_HELP_REQUESTED)
            return cli_arg_help(cli, argc > 1,
                  "USER", "Username of session to unsnoop", NULL);

      if (!config->cluster_iam_master)
      {
            cli_error(cli, "Can't do this on a slave.  Do it on %s",
                  fmtaddr(config->cluster_master_address, 0));

            return CLI_OK;
      }

      if (!argc)
      {
            cli_error(cli, "Specify a user to unsnoop");
            return CLI_OK;
      }

      for (i = 0; i < argc; i++)
      {
            if (!(s = sessionbyuser(argv[i])))
            {
                  cli_error(cli, "User %s is not connected", argv[i]);
                  continue;
            }

            cli_print(cli, "Not snooping user %s", argv[i]);
            cli_session_actions[s].action |= CLI_SESS_NOSNOOP;
      }

      return CLI_OK;
}

static int cmd_throttle(struct cli_def *cli, char *command, char **argv, int argc)
{
      int rate_in = 0;
      int rate_out = 0;
      sessionidt s;

      /*
         throttle USER                   - throttle in/out to default rate
         throttle USER RATE              - throttle in/out to default rate
         throttle USER in RATE           - throttle input only
         throttle USER out RATE          - throttle output only
         throttle USER in RATE out RATE  - throttle both
       */

      if (CLI_HELP_REQUESTED)
      {
            switch (argc)
            {
            case 1:
                  return cli_arg_help(cli, 0,
                        "USER", "Username of session to throttle", NULL);

            case 2:
                  return cli_arg_help(cli, 1,
                        "RATE", "Rate in kbps (in and out)",
                        "in",   "Select incoming rate",
                        "out",  "Select outgoing rate", NULL);

            case 4:
                  return cli_arg_help(cli, 1,
                        "in",   "Select incoming rate",
                        "out",  "Select outgoing rate", NULL);

            case 3:
                  if (isdigit(argv[1][0]))
                        return cli_arg_help(cli, 1, NULL);

            case 5:
                  return cli_arg_help(cli, 0, "RATE", "Rate in kbps", NULL);

            default:
                  return cli_arg_help(cli, argc > 1, NULL);
            }
      }

      if (!config->cluster_iam_master)
      {
            cli_error(cli, "Can't do this on a slave.  Do it on %s",
                  fmtaddr(config->cluster_master_address, 0));

            return CLI_OK;
      }

      if (argc == 0)
      {
            cli_error(cli, "Specify a user to throttle");
            return CLI_OK;
      }

      if (!(s = sessionbyuser(argv[0])))
      {
            cli_error(cli, "User %s is not connected", argv[0]);
            return CLI_OK;
      }

      if (argc == 1)
      {
            rate_in = rate_out = config->rl_rate;
      }
      else if (argc == 2)
      {
            rate_in = rate_out = atoi(argv[1]);
            if (rate_in < 1)
            {
                  cli_error(cli, "Invalid rate \"%s\"", argv[1]);
                  return CLI_OK;
            }
      }
      else if (argc == 3 || argc == 5)
      {
            int i;
            for (i = 1; i < argc - 1; i += 2)
            {
                  int r = 0;
                  if (MATCH("in", argv[i]))
                        r = rate_in = atoi(argv[i+1]);
                  else if (MATCH("out", argv[i]))
                        r = rate_out = atoi(argv[i+1]);

                  if (r < 1)
                  {
                        cli_error(cli, "Invalid rate specification \"%s %s\"", argv[i], argv[i+1]);
                        return CLI_OK;
                  }
            }
      }
      else
      {
            cli_error(cli, "Invalid arguments");
            return CLI_OK;
      }

      if ((rate_in && session[s].throttle_in) || (rate_out && session[s].throttle_out))
      {
            cli_error(cli, "User %s already throttled, unthrottle first", argv[0]);
            return CLI_OK;
      }

      cli_session_actions[s].throttle_in = cli_session_actions[s].throttle_out = -1;
      if (rate_in && session[s].throttle_in != rate_in)
            cli_session_actions[s].throttle_in = rate_in;

      if (rate_out && session[s].throttle_out != rate_out)
            cli_session_actions[s].throttle_out = rate_out;

      if (cli_session_actions[s].throttle_in == -1 &&
          cli_session_actions[s].throttle_out == -1)
      {
            cli_error(cli, "User %s already throttled at this rate", argv[0]);
            return CLI_OK;
      }

      cli_print(cli, "Throttling user %s", argv[0]);
      cli_session_actions[s].action |= CLI_SESS_THROTTLE;

      return CLI_OK;
}

static int cmd_no_throttle(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i;
      sessionidt s;

      if (CLI_HELP_REQUESTED)
            return cli_arg_help(cli, argc > 1,
                  "USER", "Username of session to unthrottle", NULL);

      if (!config->cluster_iam_master)
      {
            cli_error(cli, "Can't do this on a slave.  Do it on %s",
                  fmtaddr(config->cluster_master_address, 0));

            return CLI_OK;
      }

      if (!argc)
      {
            cli_error(cli, "Specify a user to unthrottle");
            return CLI_OK;
      }

      for (i = 0; i < argc; i++)
      {
            if (!(s = sessionbyuser(argv[i])))
            {
                  cli_error(cli, "User %s is not connected", argv[i]);
                  continue;
            }

            if (session[s].throttle_in || session[s].throttle_out)
            {
                  cli_print(cli, "Unthrottling user %s", argv[i]);
                  cli_session_actions[s].action |= CLI_SESS_NOTHROTTLE;
            }
            else
            {
                  cli_error(cli, "User %s not throttled", argv[i]);
            }
      }

      return CLI_OK;
}

static int cmd_debug(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i;

      if (CLI_HELP_REQUESTED)
            return cli_arg_help(cli, 1,
                  "all",            "Enable debugging for all except \"data\"",
                  "critical", "", // FIXME: add descriptions
                  "error",    "",
                  "warning",  "",
                  "info",           "",
                  "calls",    "",
                  "data",           "",
                  NULL);

      if (!argc)
      {
            char *p = (char *) &debug_flags;
            for (i = 0; i < sizeof(debug_flags); i++)
            {
                  if (p[i])
                  {
                        cli_print(cli, "Currently debugging:%s%s%s%s%s%s",
                              (debug_flags.critical) ? " critical" : "",
                              (debug_flags.error)    ? " error"    : "",
                              (debug_flags.warning)  ? " warning"  : "",
                              (debug_flags.info)     ? " info"     : "",
                              (debug_flags.calls)    ? " calls"    : "",
                              (debug_flags.data)     ? " data"     : "");

                        return CLI_OK;
                  }
            }

            cli_print(cli, "Debugging off");
            return CLI_OK;
      }

      for (i = 0; i < argc; i++)
      {
            int len = strlen(argv[i]);

            if (argv[i][0] == 'c' && len < 2)
                  len = 2; /* distinguish [cr]itical from [ca]lls */

            if (!strncmp("critical", argv[i], len)) { debug_flags.critical = 1; continue; }
            if (!strncmp("error",    argv[i], len)) { debug_flags.error = 1;    continue; }
            if (!strncmp("warning",  argv[i], len)) { debug_flags.warning = 1;  continue; }
            if (!strncmp("info",     argv[i], len)) { debug_flags.info = 1;     continue; }
            if (!strncmp("calls",    argv[i], len)) { debug_flags.calls = 1;    continue; }
            if (!strncmp("data",     argv[i], len)) { debug_flags.data = 1;     continue; }
            if (!strncmp("all",      argv[i], len))
            {
                  memset(&debug_flags, 1, sizeof(debug_flags));
                  debug_flags.data = 0;
                  continue;
            }

            cli_error(cli, "Invalid debugging flag \"%s\"", argv[i]);
      }

      return CLI_OK;
}

static int cmd_no_debug(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i;

      if (CLI_HELP_REQUESTED)
            return cli_arg_help(cli, 1,
                  "all",            "Disable all debugging",
                  "critical", "", // FIXME: add descriptions
                  "error",    "",
                  "warning",  "",
                  "info",           "",
                  "calls",    "",
                  "data",           "",
                  NULL);

      if (!argc)
      {
            memset(&debug_flags, 0, sizeof(debug_flags));
            return CLI_OK;
      }

      for (i = 0; i < argc; i++)
      {
            int len = strlen(argv[i]);

            if (argv[i][0] == 'c' && len < 2)
                  len = 2; /* distinguish [cr]itical from [ca]lls */

            if (!strncmp("critical", argv[i], len)) { debug_flags.critical = 0; continue; }
            if (!strncmp("error",    argv[i], len)) { debug_flags.error = 0;    continue; }
            if (!strncmp("warning",  argv[i], len)) { debug_flags.warning = 0;  continue; }
            if (!strncmp("info",     argv[i], len)) { debug_flags.info = 0;     continue; }
            if (!strncmp("calls",    argv[i], len)) { debug_flags.calls = 0;    continue; }
            if (!strncmp("data",     argv[i], len)) { debug_flags.data = 0;     continue; }
            if (!strncmp("all",      argv[i], len))
            {
                  memset(&debug_flags, 0, sizeof(debug_flags));
                  continue;
            }

            cli_error(cli, "Invalid debugging flag \"%s\"", argv[i]);
      }

      return CLI_OK;
}

static int cmd_load_plugin(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i, firstfree = 0;

      if (CLI_HELP_REQUESTED)
            return cli_arg_help(cli, argc > 1,
                  "PLUGIN", "Name of plugin to load", NULL);

      if (argc != 1)
      {
            cli_error(cli, "Specify a plugin to load");
            return CLI_OK;
      }

      for (i = 0; i < MAXPLUGINS; i++)
      {
            if (!*config->plugins[i] && !firstfree)
                  firstfree = i;
            if (strcmp(config->plugins[i], argv[0]) == 0)
            {
                  cli_error(cli, "Plugin is already loaded");
                  return CLI_OK;
            }
      }

      if (firstfree)
      {
            strncpy(config->plugins[firstfree], argv[0], sizeof(config->plugins[firstfree]) - 1);
            config->reload_config = 1;
            cli_print(cli, "Loading plugin %s", argv[0]);
      }

      return CLI_OK;
}

static int cmd_remove_plugin(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i;

      if (CLI_HELP_REQUESTED)
            return cli_arg_help(cli, argc > 1,
                  "PLUGIN", "Name of plugin to unload", NULL);

      if (argc != 1)
      {
            cli_error(cli, "Specify a plugin to remove");
            return CLI_OK;
      }

      for (i = 0; i < MAXPLUGINS; i++)
      {
            if (strcmp(config->plugins[i], argv[0]) == 0)
            {
                  config->reload_config = 1;
                  memset(config->plugins[i], 0, sizeof(config->plugins[i]));
                  return CLI_OK;
            }
      }

      cli_error(cli, "Plugin is not loaded");
      return CLI_OK;
}

static char *duration(time_t secs)
{
      static char *buf = NULL;
      int p = 0;

      if (!buf) buf = calloc(64, 1);

      if (secs >= 86400)
      {
            int days = secs / 86400;
            p = sprintf(buf, "%d day%s, ", days, days > 1 ? "s" : "");
            secs %= 86400;
      }

      if (secs >= 3600)
      {
            int mins = secs / 60;
            int hrs = mins / 60;

            mins %= 60;
            sprintf(buf + p, "%d:%02d", hrs, mins);
      }
      else if (secs >= 60)
      {
            int mins = secs / 60;
            sprintf(buf + p, "%d min%s", mins, mins > 1 ? "s" : "");
      }
      else
            sprintf(buf, "%ld sec%s", secs, secs > 1 ? "s" : "");

      return buf;
}

static int cmd_uptime(struct cli_def *cli, char *command, char **argv, int argc)
{
      FILE *fh;
      char buf[100], *p = buf, *loads[3];
      int i, num_sessions = 0;

      if (CLI_HELP_REQUESTED)
            return CLI_HELP_NO_ARGS;

      fh = fopen("/proc/loadavg", "r");
      fgets(buf, 100, fh);
      fclose(fh);

      for (i = 0; i < 3; i++)
            loads[i] = strdup(strsep(&p, " "));

      time(&time_now);
      strftime(buf, 99, "%H:%M:%S", localtime(&time_now));

      for (i = 1; i < MAXSESSION; i++)
            if (session[i].opened) num_sessions++;

      cli_print(cli, "%s up %s, %d users, load average: %s, %s, %s",
                  buf,
                  duration(time_now - config->start_time),
                  num_sessions,
                  loads[0], loads[1], loads[2]
      );
      for (i = 0; i < 3; i++)
            if (loads[i]) free(loads[i]);

      cli_print(cli, "Bandwidth: %s", config->bandwidth);

      return CLI_OK;
}

static int cmd_set(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i;

      if (CLI_HELP_REQUESTED)
      {
            switch (argc)
            {
            case 1:
                  {
                        int len = strlen(argv[0])-1;
                        for (i = 0; config_values[i].key; i++)
                              if (!len || !strncmp(config_values[i].key, argv[0], len))
                                    cli_error(cli, "  %s", config_values[i].key);
                  }

                  return CLI_OK;

            case 2:
                  return cli_arg_help(cli, 0,
                        "VALUE", "Value for variable", NULL);

            case 3:
                  if (!argv[2][1])
                        return cli_arg_help(cli, 1, NULL);

            default:
                  return CLI_OK;
            }
      }

      if (argc != 2)
      {
            cli_error(cli, "Specify variable and value");
            return CLI_OK;
      }

      for (i = 0; config_values[i].key; i++)
      {
            void *value = ((void *) config) + config_values[i].offset;
            if (strcmp(config_values[i].key, argv[0]) == 0)
            {
                  // Found a value to set
                  cli_print(cli, "Setting \"%s\" to \"%s\"", argv[0], argv[1]);
                  switch (config_values[i].type)
                  {
                  case STRING:
                        snprintf((char *) value, config_values[i].size, "%s", argv[1]);
                        break;
                  case INT:
                        *(int *) value = atoi(argv[1]);
                        break;
                  case UNSIGNED_LONG:
                        *(unsigned long *) value = atol(argv[1]);
                        break;
                  case SHORT:
                        *(short *) value = atoi(argv[1]);
                        break;
                  case IPv4:
                        *(in_addr_t *) value = inet_addr(argv[1]);
                        break;
                  case IPv6:
                        inet_pton(AF_INET6, argv[1], value);
                        break;
                  case BOOL:
                        if (strcasecmp(argv[1], "yes") == 0 || strcasecmp(argv[1], "true") == 0 || strcasecmp(argv[1], "1") == 0)
                              *(int *) value = 1;
                        else
                              *(int *) value = 0;
                        break;
                  default:
                        cli_error(cli, "Unknown variable type");
                        break;
                  }
                  config->reload_config = 1;
                  return CLI_OK;
            }
      }

      cli_error(cli, "Unknown variable \"%s\"", argv[0]);
      return CLI_OK;
}

int regular_stuff(struct cli_def *cli)
{
#ifdef RINGBUFFER
      int out = 0;
      int i;

      for (i = debug_rb_tail; i != ringbuffer->tail; i = (i + 1) % RINGBUFFER_SIZE)
      {
            char *m = ringbuffer->buffer[i].message;
            char *p;
            int show = 0;

            if (!*m) continue;

            switch (ringbuffer->buffer[i].level)
            {
            case 0: show = debug_flags.critical;      break;
            case 1: show = debug_flags.error;   break;
            case 2: show = debug_flags.warning; break;
            case 3: show = debug_flags.info;    break;
            case 4: show = debug_flags.calls;   break;
            case 5: show = debug_flags.data;    break;
            }

            if (!show) continue;

            if (!(p = strchr(m, '\n')))
                  p = m + strlen(m);

            cli_error(cli, "\r%s-%u-%u %.*s",
                  debug_levels[(int)ringbuffer->buffer[i].level],
                  ringbuffer->buffer[i].tunnel,
                  ringbuffer->buffer[i].session,
                  (int) (p - m), m);

            out++;
      }

      debug_rb_tail = ringbuffer->tail;
      if (out)
            cli_reprompt(cli);
#endif
      return CLI_OK;
}

#ifdef BGP
static int cmd_router_bgp(struct cli_def *cli, char *command, char **argv, int argc)
{
      int as;

      if (CLI_HELP_REQUESTED)
            return cli_arg_help(cli, argc > 1,
                  "<1-65535>", "Autonomous system number", NULL);

      if (argc != 1 || (as = atoi(argv[0])) < 1 || as > 65535)
      {
            cli_error(cli, "Invalid autonomous system number");
            return CLI_OK;
      }

      if (bgp_configured && as != config->as_number)
      {
            cli_error(cli, "Can't change local AS on a running system");
            return CLI_OK;
      }

      config->as_number = as;
      cli_set_configmode(cli, MODE_CONFIG_BGP, "router");

      return CLI_OK;
}

static int find_bgp_neighbour(char const *name)
{
      int i;
      int new = -1;
      struct hostent *h;
      in_addr_t addrs[4] = { 0 };
      char **a;

      if (!(h = gethostbyname(name)) || h->h_addrtype != AF_INET)
            return -2;

      for (i = 0; i < sizeof(addrs) / sizeof(*addrs) && h->h_addr_list[i]; i++)
            memcpy(&addrs[i], h->h_addr_list[i], sizeof(*addrs));

      for (i = 0; i < BGP_NUM_PEERS; i++)
      {
            if (!config->neighbour[i].name[0])
            {
                  if (new == -1) new = i;
                  continue;
            }

            if (!strcmp(name, config->neighbour[i].name))
                  return i;

            if (!(h = gethostbyname(config->neighbour[i].name)) || h->h_addrtype != AF_INET)
                  continue;

            for (a = h->h_addr_list; *a; a++)
            {
                  int j;
                  for (j = 0; j < sizeof(addrs) / sizeof(*addrs) && addrs[j]; j++)
                        if (!memcmp(&addrs[j], *a, sizeof(*addrs)))
                              return i;
            }
      }

      return new;
}

static int cmd_router_bgp_neighbour(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i;
      int keepalive;
      int hold;

      if (CLI_HELP_REQUESTED)
      {
            switch (argc)
            {
            case 1:
                  return cli_arg_help(cli, 0,
                        "A.B.C.D", "BGP neighbour address",
                        "NAME",    "BGP neighbour name",
                        NULL);

            case 2:
                  return cli_arg_help(cli, 0,
                        "remote-as", "Set remote autonomous system number",
                        "timers",    "Set timers",
                        NULL);

            default:
                  if (MATCH("remote-as", argv[1]))
                        return cli_arg_help(cli, argv[2][1], "<1-65535>", "Autonomous system number", NULL);

                  if (MATCH("timers", argv[1]))
                  {
                        if (argc == 3)
                              return cli_arg_help(cli, 0, "<1-65535>", "Keepalive time", NULL);

                        if (argc == 4)
                              return cli_arg_help(cli, argv[3][1], "<3-65535>", "Hold time", NULL);

                        if (argc == 5 && !argv[4][1])
                              return cli_arg_help(cli, 1, NULL);
                  }

                  return CLI_OK;
            }
      }

      if (argc < 3)
      {
            cli_error(cli, "Invalid arguments");
            return CLI_OK;
      }

      if ((i = find_bgp_neighbour(argv[0])) == -2)
      {
            cli_error(cli, "Invalid neighbour");
            return CLI_OK;
      }

      if (i == -1)
      {
            cli_error(cli, "Too many neighbours (max %d)", BGP_NUM_PEERS);
            return CLI_OK;
      }

      if (MATCH("remote-as", argv[1]))
      {
            int as = atoi(argv[2]);
            if (as < 0 || as > 65535)
            {
                  cli_error(cli, "Invalid autonomous system number");
                  return CLI_OK;
            }

            if (!config->neighbour[i].name[0])
            {
                  snprintf(config->neighbour[i].name, sizeof(config->neighbour[i].name), "%s", argv[0]);
                  config->neighbour[i].keepalive = -1;
                  config->neighbour[i].hold = -1;
            }

            config->neighbour[i].as = as;
            return CLI_OK;
      }

      if (argc != 4 || !MATCH("timers", argv[1]))
      {
            cli_error(cli, "Invalid arguments");
            return CLI_OK;
      }

      if (!config->neighbour[i].name[0])
      {
            cli_error(cli, "Specify remote-as first");
            return CLI_OK;
      }

      keepalive = atoi(argv[2]);
      hold = atoi(argv[3]);

      if (keepalive < 1 || keepalive > 65535)
      {
            cli_error(cli, "Invalid keepalive time");
            return CLI_OK;
      }

      if (hold < 3 || hold > 65535)
      {
            cli_error(cli, "Invalid hold time");
            return CLI_OK;
      }

      if (keepalive == BGP_KEEPALIVE_TIME)
            keepalive = -1; // using default value

      if (hold == BGP_HOLD_TIME)
            hold = -1;

      config->neighbour[i].keepalive = keepalive;
      config->neighbour[i].hold = hold;

      return CLI_OK;
}

static int cmd_router_bgp_no_neighbour(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i;

      if (CLI_HELP_REQUESTED)
            return cli_arg_help(cli, argc > 0,
                  "A.B.C.D", "BGP neighbour address",
                  "NAME",    "BGP neighbour name",
                  NULL);

      if (argc != 1)
      {
            cli_error(cli, "Specify a BGP neighbour");
            return CLI_OK;
      }

      if ((i = find_bgp_neighbour(argv[0])) == -2)
      {
            cli_error(cli, "Invalid neighbour");
            return CLI_OK;
      }

      if (i < 0 || !config->neighbour[i].name[0])
      {
            cli_error(cli, "Neighbour %s not configured", argv[0]);
            return CLI_OK;
      }

      memset(&config->neighbour[i], 0, sizeof(config->neighbour[i]));
      return CLI_OK;
}

static int cmd_show_bgp(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i;
      int hdr = 0;
      char *addr;

      if (!bgp_configured)
            return CLI_OK;

      if (CLI_HELP_REQUESTED)
            return cli_arg_help(cli, 1,
                  "A.B.C.D", "BGP neighbour address",
                  "NAME",    "BGP neighbour name",
                  NULL);

      cli_print(cli, "BGPv%d router identifier %s, local AS number %d",
            BGP_VERSION, fmtaddr(my_address, 0), (int) config->as_number);

      time(&time_now);

      for (i = 0; i < BGP_NUM_PEERS; i++)
      {
            if (!*bgp_peers[i].name)
                  continue;

            addr = fmtaddr(bgp_peers[i].addr, 0);
            if (argc && strcmp(addr, argv[0]) &&
                strncmp(bgp_peers[i].name, argv[0], strlen(argv[0])))
                  continue;

            if (!hdr++)
            {
                  cli_print(cli, "");
                  cli_print(cli, "Peer                  AS         Address "
                      "State       Retries Retry in Route Pend    Timers");
                  cli_print(cli, "------------------ ----- --------------- "
                      "----------- ------- -------- ----- ---- ---------");
            }

            cli_print(cli, "%-18.18s %5d %15s %-11s %7d %7lds %5s %4s %4d %4d",
                  bgp_peers[i].name,
                  bgp_peers[i].as,
                  addr,
                  bgp_state_str(bgp_peers[i].state),
                  bgp_peers[i].retry_count,
                  bgp_peers[i].retry_time ? bgp_peers[i].retry_time - time_now : 0,
                  bgp_peers[i].routing ? "yes" : "no",
                  bgp_peers[i].update_routes ? "yes" : "no",
                  bgp_peers[i].keepalive,
                  bgp_peers[i].hold);
      }

      return CLI_OK;
}

static int cmd_suspend_bgp(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i;
      char *addr;

      if (!bgp_configured)
            return CLI_OK;

      if (CLI_HELP_REQUESTED)
            return cli_arg_help(cli, 1,
                  "A.B.C.D", "BGP neighbour address",
                  "NAME",    "BGP neighbour name",
                  NULL);

      for (i = 0; i < BGP_NUM_PEERS; i++)
      {
            if (bgp_peers[i].state != Established)
                  continue;

            if (!bgp_peers[i].routing)
                  continue;

            addr = fmtaddr(bgp_peers[i].addr, 0);
            if (argc && strcmp(addr, argv[0]) && strcmp(bgp_peers[i].name, argv[0]))
                  continue;

            bgp_peers[i].cli_flag = BGP_CLI_SUSPEND;
            cli_print(cli, "Suspending peer %s", bgp_peers[i].name);
      }

      return CLI_OK;
}

static int cmd_no_suspend_bgp(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i;
      char *addr;

      if (!bgp_configured)
            return CLI_OK;

      if (CLI_HELP_REQUESTED)
            return cli_arg_help(cli, 1,
                  "A.B.C.D", "BGP neighbour address",
                  "NAME",    "BGP neighbour name",
                  NULL);

      for (i = 0; i < BGP_NUM_PEERS; i++)
      {
            if (bgp_peers[i].state != Established)
                  continue;

            if (bgp_peers[i].routing)
                  continue;

            addr = fmtaddr(bgp_peers[i].addr, 0);
            if (argc && strcmp(addr, argv[0]) &&
                strncmp(bgp_peers[i].name, argv[0], strlen(argv[0])))
                  continue;

            bgp_peers[i].cli_flag = BGP_CLI_ENABLE;
            cli_print(cli, "Un-suspending peer %s", bgp_peers[i].name);
      }

      return CLI_OK;
}

static int cmd_restart_bgp(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i;
      char *addr;

      if (!bgp_configured)
            return CLI_OK;

      if (CLI_HELP_REQUESTED)
            return cli_arg_help(cli, 1,
                  "A.B.C.D", "BGP neighbour address",
                  "NAME",    "BGP neighbour name",
                  NULL);

      for (i = 0; i < BGP_NUM_PEERS; i++)
      {
            if (!*bgp_peers[i].name)
                  continue;

            addr = fmtaddr(bgp_peers[i].addr, 0);
            if (argc && strcmp(addr, argv[0]) &&
                strncmp(bgp_peers[i].name, argv[0], strlen(argv[0])))
                  continue;

            bgp_peers[i].cli_flag = BGP_CLI_RESTART;
            cli_print(cli, "Restarting peer %s", bgp_peers[i].name);
      }

      return CLI_OK;
}
#endif /* BGP*/

static int filt;
static int access_list(struct cli_def *cli, char **argv, int argc, int add)
{
      int extended;

      if (CLI_HELP_REQUESTED)
      {
            switch (argc)
            {
            case 1:
                  return cli_arg_help(cli, 0,
                        "standard", "Standard syntax",
                        "extended", "Extended syntax",
                        NULL);

            case 2:
                  return cli_arg_help(cli, argv[1][1],
                        "NAME", "Access-list name",
                        NULL);

            default:
                  if (argc == 3 && !argv[2][1])
                        return cli_arg_help(cli, 1, NULL);

                  return CLI_OK;
            }
      }

      if (argc != 2)
      {
            cli_error(cli, "Specify access-list type and name");
            return CLI_OK;
      }

      if (MATCH("standard", argv[0]))
            extended = 0;
      else if (MATCH("extended", argv[0]))
            extended = 1;
      else
      {
            cli_error(cli, "Invalid access-list type");
            return CLI_OK;
      }

      if (strlen(argv[1]) > sizeof(ip_filters[0].name) - 1 ||
          strspn(argv[1], "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-") != strlen(argv[1]))
      {
            cli_error(cli, "Invalid access-list name");
            return CLI_OK;
      }

      filt = find_filter(argv[1], strlen(argv[1]));
      if (add)
      {
            if (filt < 0)
            {
                  cli_error(cli, "Too many access-lists");
                  return CLI_OK;
            }

            // racy
            if (!*ip_filters[filt].name)
            {
                  memset(&ip_filters[filt], 0, sizeof(ip_filters[filt]));
                  strcpy(ip_filters[filt].name, argv[1]);
                  ip_filters[filt].extended = extended;
            }
            else if (ip_filters[filt].extended != extended)
            {
                  cli_error(cli, "Access-list is %s",
                        ip_filters[filt].extended ? "extended" : "standard");

                  return CLI_OK;
            }

            cli_set_configmode(cli, MODE_CONFIG_NACL, extended ? "ext-nacl" : "std-nacl");
            return CLI_OK;
      }

      if (filt < 0 || !*ip_filters[filt].name)
      {
            cli_error(cli, "Access-list not defined");
            return CLI_OK;
      }

      // racy
      if (ip_filters[filt].used)
      {
            cli_error(cli, "Access-list in use");
            return CLI_OK;
      }

      memset(&ip_filters[filt], 0, sizeof(ip_filters[filt]));
      return CLI_OK;
}

static int cmd_ip_access_list(struct cli_def *cli, char *command, char **argv, int argc)
{
      return access_list(cli, argv, argc, 1);
}

static int cmd_no_ip_access_list(struct cli_def *cli, char *command, char **argv, int argc)
{
      return access_list(cli, argv, argc, 0);
}

static int show_ip_wild(char *buf, in_addr_t ip, in_addr_t wild)
{
      if (ip == INADDR_ANY && wild == INADDR_BROADCAST)
            return sprintf(buf, " any");

      if (wild == INADDR_ANY)
            return sprintf(buf, " host %s", fmtaddr(ip, 0));

      return sprintf(buf, " %s %s", fmtaddr(ip, 0), fmtaddr(wild, 1));
}

static int show_ports(char *buf, ip_filter_portt *ports)
{
      switch (ports->op)
      {
      case FILTER_PORT_OP_EQ:    return sprintf(buf, " eq %u", ports->port);
      case FILTER_PORT_OP_NEQ:   return sprintf(buf, " neq %u", ports->port);
      case FILTER_PORT_OP_GT:    return sprintf(buf, " gt %u", ports->port);
      case FILTER_PORT_OP_LT:    return sprintf(buf, " lt %u", ports->port);
      case FILTER_PORT_OP_RANGE: return sprintf(buf, " range %u %u", ports->port, ports->port2);
      }

      return 0;
}

static char const *show_access_list_rule(int extended, ip_filter_rulet *rule)
{
      static char buf[256];
      char *p = buf;

      p += sprintf(p, " %s", rule->action == FILTER_ACTION_PERMIT ? "permit" : "deny");
      if (extended)
      {
            struct protoent *proto = getprotobynumber(rule->proto);
            p += sprintf(p, " %s", proto ? proto->p_name : "ERR");
      }

      p += show_ip_wild(p, rule->src_ip, rule->src_wild);
      if (!extended)
            return buf;

      if (rule->proto == IPPROTO_TCP || rule->proto == IPPROTO_UDP)
            p += show_ports(p, &rule->src_ports);

      p += show_ip_wild(p, rule->dst_ip, rule->dst_wild);
      if (rule->proto == IPPROTO_TCP || rule->proto == IPPROTO_UDP)
            p += show_ports(p, &rule->dst_ports);

      if (rule->proto == IPPROTO_TCP && rule->tcp_flag_op)
      {
            switch (rule->tcp_flag_op)
            {
            case FILTER_FLAG_OP_EST:
                  p += sprintf(p, " established");
                  break;

            case FILTER_FLAG_OP_ANY:
            case FILTER_FLAG_OP_ALL:
                  p += sprintf(p, " match-%s", rule->tcp_flag_op == FILTER_FLAG_OP_ALL ? "all" : "any");
                  if (rule->tcp_sflags & TCP_FLAG_FIN) p += sprintf(p, " +fin");
                  if (rule->tcp_cflags & TCP_FLAG_FIN) p += sprintf(p, " -fin");
                  if (rule->tcp_sflags & TCP_FLAG_SYN) p += sprintf(p, " +syn");
                  if (rule->tcp_cflags & TCP_FLAG_SYN) p += sprintf(p, " -syn");
                  if (rule->tcp_sflags & TCP_FLAG_RST) p += sprintf(p, " +rst");
                  if (rule->tcp_cflags & TCP_FLAG_RST) p += sprintf(p, " -rst");
                  if (rule->tcp_sflags & TCP_FLAG_PSH) p += sprintf(p, " +psh");
                  if (rule->tcp_cflags & TCP_FLAG_PSH) p += sprintf(p, " -psh");
                  if (rule->tcp_sflags & TCP_FLAG_ACK) p += sprintf(p, " +ack");
                  if (rule->tcp_cflags & TCP_FLAG_ACK) p += sprintf(p, " -ack");
                  if (rule->tcp_sflags & TCP_FLAG_URG) p += sprintf(p, " +urg");
                  if (rule->tcp_cflags & TCP_FLAG_URG) p += sprintf(p, " -urg");
                  break;
            }
      }

      if (rule->frag)
            p += sprintf(p, " fragments");

      return buf;
}

static ip_filter_rulet *access_list_rule_ext(struct cli_def *cli, char *command, char **argv, int argc)
{
      static ip_filter_rulet rule;
      struct in_addr addr;
      int i;
      int a;

      if (CLI_HELP_REQUESTED)
      {
            if (argc == 1)
            {
                  cli_arg_help(cli, 0,
                        "ip",  "Match IP packets",
                        "tcp", "Match TCP packets",
                        "udp", "Match UDP packets",
                        NULL);

                  return NULL;
            }

            // *sigh*, too darned complex
            cli_arg_help(cli, 0, "RULE", "SOURCE [PORTS] DEST [PORTS] FLAGS", NULL);
            return NULL;
      }

      if (argc < 3)
      {
            cli_error(cli, "Specify rule details");
            return NULL;
      }

      memset(&rule, 0, sizeof(rule));
      rule.action = (command[0] == 'p')
            ? FILTER_ACTION_PERMIT
            : FILTER_ACTION_DENY;

      if (MATCH("ip", argv[0]))
            rule.proto = IPPROTO_IP;
      else if (MATCH("udp", argv[0]))
            rule.proto = IPPROTO_UDP;
      else if (MATCH("tcp", argv[0]))
            rule.proto = IPPROTO_TCP;
      else
      {
            cli_error(cli, "Invalid protocol \"%s\"", argv[0]);
            return NULL;
      }

      for (a = 1, i = 0; i < 2; i++)
      {
            in_addr_t *ip;
            in_addr_t *wild;
            ip_filter_portt *port;

            if (i == 0)
            {
                  ip = &rule.src_ip;
                  wild = &rule.src_wild;
                  port = &rule.src_ports;
            }
            else
            {
                  ip = &rule.dst_ip;
                  wild = &rule.dst_wild;
                  port = &rule.dst_ports;
                  if (a >= argc)
                  {
                        cli_error(cli, "Specify destination");
                        return NULL;
                  }
            }

            if (MATCH("any", argv[a]))
            {
                  *ip = INADDR_ANY;
                  *wild = INADDR_BROADCAST;
                  a++;
            }
            else if (MATCH("host", argv[a]))
            {
                  if (++a >= argc)
                  {
                        cli_error(cli, "Specify host ip address");
                        return NULL;
                  }

                  if (!inet_aton(argv[a], &addr))
                  {
                        cli_error(cli, "Cannot parse IP \"%s\"", argv[a]);
                        return NULL;
                  }

                  *ip = addr.s_addr;
                  *wild = INADDR_ANY;
                  a++;
            }
            else
            {
                  if (a >= argc - 1)
                  {
                        cli_error(cli, "Specify %s ip address and wildcard", i ? "destination" : "source");
                        return NULL;
                  }

                  if (!inet_aton(argv[a], &addr))
                  {
                        cli_error(cli, "Cannot parse IP \"%s\"", argv[a]);
                        return NULL;
                  }

                  *ip = addr.s_addr;

                  if (!inet_aton(argv[++a], &addr))
                  {
                        cli_error(cli, "Cannot parse IP \"%s\"", argv[a]);
                        return NULL;
                  }

                  *wild = addr.s_addr;
                  a++;
            }

            if (rule.proto == IPPROTO_IP || a >= argc)
                  continue;

            port->op = 0;
            if (MATCH("eq", argv[a]))
                  port->op = FILTER_PORT_OP_EQ;
            else if (MATCH("neq", argv[a]))
                  port->op = FILTER_PORT_OP_NEQ;
            else if (MATCH("gt", argv[a]))
                  port->op = FILTER_PORT_OP_GT;
            else if (MATCH("lt", argv[a]))
                  port->op = FILTER_PORT_OP_LT;
            else if (MATCH("range", argv[a]))
                  port->op = FILTER_PORT_OP_RANGE;

            if (!port->op)
                  continue;

            if (++a >= argc)
            {
                  cli_error(cli, "Specify port");
                  return NULL;
            }

            if (!(port->port = atoi(argv[a])))
            {
                  cli_error(cli, "Invalid port \"%s\"", argv[a]);
                  return NULL;
            }
                  
            a++;
            if (port->op != FILTER_PORT_OP_RANGE)
                  continue;

            if (a >= argc)
            {
                  cli_error(cli, "Specify port");
                  return NULL;
            }

            if (!(port->port2 = atoi(argv[a])) || port->port2 < port->port)
            {
                  cli_error(cli, "Invalid port \"%s\"", argv[a]);
                  return NULL;
            }
                  
            a++;
      }

      if (rule.proto == IPPROTO_TCP && a < argc)
      {
            if (MATCH("established", argv[a]))
            {
                  rule.tcp_flag_op = FILTER_FLAG_OP_EST;
                  a++;
            }
            else if (!strcmp(argv[a], "match-any") || !strcmp(argv[a], "match-an") ||
                   !strcmp(argv[a], "match-all") || !strcmp(argv[a], "match-al"))
            {
                  rule.tcp_flag_op = argv[a][7] == 'n'
                        ? FILTER_FLAG_OP_ANY
                        : FILTER_FLAG_OP_ALL;

                  if (++a >= argc)
                  {
                        cli_error(cli, "Specify tcp flags");
                        return NULL;
                  }

                  while (a < argc && (argv[a][0] == '+' || argv[a][0] == '-'))
                  {
                        uint8_t *f;

                        f = (argv[a][0] == '+') ? &rule.tcp_sflags : &rule.tcp_cflags;

                        if (MATCH("fin", &argv[a][1]))      *f |= TCP_FLAG_FIN;
                        else if (MATCH("syn", &argv[a][1])) *f |= TCP_FLAG_SYN;
                        else if (MATCH("rst", &argv[a][1])) *f |= TCP_FLAG_RST;
                        else if (MATCH("psh", &argv[a][1])) *f |= TCP_FLAG_PSH;
                        else if (MATCH("ack", &argv[a][1])) *f |= TCP_FLAG_ACK;
                        else if (MATCH("urg", &argv[a][1])) *f |= TCP_FLAG_URG;
                        else
                        {
                              cli_error(cli, "Invalid tcp flag \"%s\"", argv[a]);
                              return NULL;
                        }

                        a++;
                  }
            }
      }

      if (a < argc && MATCH("fragments", argv[a]))
      {
            if (rule.src_ports.op || rule.dst_ports.op || rule.tcp_flag_op)
            {
                  cli_error(cli, "Can't specify \"fragments\" on rules with layer 4 matches");
                  return NULL;
            }

            rule.frag = 1;
            a++;
      }

      if (a < argc)
      {
            cli_error(cli, "Invalid flag \"%s\"", argv[a]);
            return NULL;
      }

      return &rule;
}

static ip_filter_rulet *access_list_rule_std(struct cli_def *cli, char *command, char **argv, int argc)
{
      static ip_filter_rulet rule;
      struct in_addr addr;

      if (CLI_HELP_REQUESTED)
      {
            if (argc == 1)
            {
                  cli_arg_help(cli, argv[0][1],
                        "A.B.C.D", "Source address",
                        "any",     "Any source address",
                        "host",    "Source host",
                        NULL);

                  return NULL;
            }

            if (MATCH("any", argv[0]))
            {
                  if (argc == 2 && !argv[1][1])
                        cli_arg_help(cli, 1, NULL);
            }
            else if (MATCH("host", argv[0]))
            {
                  if (argc == 2)
                  {
                        cli_arg_help(cli, argv[1][1],
                              "A.B.C.D", "Host address",
                              NULL);
                  }
                  else if (argc == 3 && !argv[2][1])
                        cli_arg_help(cli, 1, NULL);
            }
            else
            {
                  if (argc == 2)
                  {
                        cli_arg_help(cli, 1,
                              "A.B.C.D", "Wildcard bits",
                              NULL);
                  }
                  else if (argc == 3 && !argv[2][1])
                        cli_arg_help(cli, 1, NULL);
            }

            return NULL;
      }

      if (argc < 1)
      {
            cli_error(cli, "Specify rule details");
            return NULL;
      }

      memset(&rule, 0, sizeof(rule));
      rule.action = (command[0] == 'p')
            ? FILTER_ACTION_PERMIT
            : FILTER_ACTION_DENY;

      rule.proto = IPPROTO_IP;
      if (MATCH("any", argv[0]))
      {
            rule.src_ip = INADDR_ANY;
            rule.src_wild = INADDR_BROADCAST;
      }
      else if (MATCH("host", argv[0]))
      {
            if (argc != 2)
            {
                  cli_error(cli, "Specify host ip address");
                  return NULL;
            }

            if (!inet_aton(argv[1], &addr))
            {
                  cli_error(cli, "Cannot parse IP \"%s\"", argv[1]);
                  return NULL;
            }

            rule.src_ip = addr.s_addr;
            rule.src_wild = INADDR_ANY;
      }
      else
      {
            if (argc > 2)
            {
                  cli_error(cli, "Specify source ip address and wildcard");
                  return NULL;
            }

            if (!inet_aton(argv[0], &addr))
            {
                  cli_error(cli, "Cannot parse IP \"%s\"", argv[0]);
                  return NULL;
            }

            rule.src_ip = addr.s_addr;

            if (argc > 1)
            {
                  if (!inet_aton(argv[1], &addr))
                  {
                        cli_error(cli, "Cannot parse IP \"%s\"", argv[1]);
                        return NULL;
                  }

                  rule.src_wild = addr.s_addr;
            }
            else
                  rule.src_wild = INADDR_ANY;
      }

      return &rule;
}

static int cmd_ip_access_list_rule(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i;
      ip_filter_rulet *rule = ip_filters[filt].extended
            ? access_list_rule_ext(cli, command, argv, argc)
            : access_list_rule_std(cli, command, argv, argc);

      if (!rule)
            return CLI_OK;

      for (i = 0; i < MAXFILTER_RULES - 1; i++) // -1: list always terminated by empty rule
      {
            if (!ip_filters[filt].rules[i].action)
            {
                  memcpy(&ip_filters[filt].rules[i], rule, sizeof(*rule));
                  return CLI_OK;
            }

            if (!memcmp(&ip_filters[filt].rules[i], rule, offsetof(ip_filter_rulet, counter)))
                  return CLI_OK;
      }

      cli_error(cli, "Too many rules");
      return CLI_OK;
}

static int cmd_filter(struct cli_def *cli, char *command, char **argv, int argc)
{
      sessionidt s;
      int i;

      /* filter USER {in|out} FILTER ... */
      if (CLI_HELP_REQUESTED)
      {
            switch (argc)
            {
            case 1:
                  return cli_arg_help(cli, 0,
                        "USER", "Username of session to filter", NULL);

            case 2:
            case 4:
                  return cli_arg_help(cli, 0,
                        "in",   "Set incoming filter",
                        "out",  "Set outgoing filter", NULL);

            case 3:
            case 5:
                  return cli_arg_help(cli, argc == 5 && argv[4][1],
                        "NAME", "Filter name", NULL);

            default:
                  return cli_arg_help(cli, argc > 1, NULL);
            }
      }

      if (!config->cluster_iam_master)
      {
            cli_error(cli, "Can't do this on a slave.  Do it on %s",
                  fmtaddr(config->cluster_master_address, 0));

            return CLI_OK;
      }

      if (argc != 3 && argc != 5)
      {
            cli_error(cli, "Specify a user and filters");
            return CLI_OK;
      }

      if (!(s = sessionbyuser(argv[0])))
      {
            cli_error(cli, "User %s is not connected", argv[0]);
            return CLI_OK;
      }

      cli_session_actions[s].filter_in = cli_session_actions[s].filter_out = -1;
      for (i = 1; i < argc; i += 2)
      {
            int *f = 0;
            int v;

            if (MATCH("in", argv[i]))
            {
                  if (session[s].filter_in)
                  {
                        cli_error(cli, "Input already filtered");
                        return CLI_OK;
                  }
                  f = &cli_session_actions[s].filter_in;
            }
            else if (MATCH("out", argv[i]))
            {
                  if (session[s].filter_out)
                  {
                        cli_error(cli, "Output already filtered");
                        return CLI_OK;
                  }
                  f = &cli_session_actions[s].filter_out;
            }
            else
            {
                  cli_error(cli, "Invalid filter specification");
                  return CLI_OK;
            }

            v = find_filter(argv[i+1], strlen(argv[i+1]));
            if (v < 0 || !*ip_filters[v].name)
            {
                  cli_error(cli, "Access-list %s not defined", argv[i+1]);
                  return CLI_OK;
            }

            *f = v + 1;
      }

      cli_print(cli, "Filtering user %s", argv[0]);
      cli_session_actions[s].action |= CLI_SESS_FILTER;

      return CLI_OK;
}

static int cmd_no_filter(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i;
      sessionidt s;

      if (CLI_HELP_REQUESTED)
            return cli_arg_help(cli, argc > 1,
                  "USER", "Username of session to remove filters from", NULL);

      if (!config->cluster_iam_master)
      {
            cli_error(cli, "Can't do this on a slave.  Do it on %s",
                  fmtaddr(config->cluster_master_address, 0));

            return CLI_OK;
      }

      if (!argc)
      {
            cli_error(cli, "Specify a user to remove filters from");
            return CLI_OK;
      }

      for (i = 0; i < argc; i++)
      {
            if (!(s = sessionbyuser(argv[i])))
            {
                  cli_error(cli, "User %s is not connected", argv[i]);
                  continue;
            }

            if (session[s].filter_in || session[s].filter_out)
            {
                  cli_print(cli, "Removing filters from user %s", argv[i]);
                  cli_session_actions[s].action |= CLI_SESS_NOFILTER;
            }
            else
            {
                  cli_error(cli, "User %s not filtered", argv[i]);
            }
      }

      return CLI_OK;
}

static int cmd_show_access_list(struct cli_def *cli, char *command, char **argv, int argc)
{
      int i;

      if (CLI_HELP_REQUESTED)
            return cli_arg_help(cli, argc > 1, "NAME", "Filter name", NULL);

      if (argc < 1)
      {
            cli_error(cli, "Specify a filter name");
            return CLI_OK;
      }

      for (i = 0; i < argc; i++)
      {
            int f = find_filter(argv[i], strlen(argv[i]));
            ip_filter_rulet *rules;

            if (f < 0 || !*ip_filters[f].name)
            {
                  cli_error(cli, "Access-list %s not defined", argv[i]);
                  return CLI_OK;
            }

            if (i)
                  cli_print(cli, "");

            cli_print(cli, "%s IP access list %s",
                  ip_filters[f].extended ? "Extended" : "Standard",
                  ip_filters[f].name);

            for (rules = ip_filters[f].rules; rules->action; rules++)
            {
                  char const *r = show_access_list_rule(ip_filters[f].extended, rules);
                  if (rules->counter)
                        cli_print(cli, "%s (%u match%s)", r,
                              rules->counter, rules->counter > 1 ? "es" : "");
                  else
                        cli_print(cli, "%s", r);
            }
      }

      return CLI_OK;
}

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