- TerminateAck fix from Yuri

[l2tpns.git] / cli.c

// L2TPNS Command Line Interface
// vim: sw=4 ts=8

char const *cvs_name = "$Name:  $";
char const *cvs_id_cli = "$Id: cli.c,v 1.10 2004/07/11 07:57:33 bodea Exp $";

#include <stdio.h>
#include <stdarg.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <syslog.h>
#include <malloc.h>
#include <sched.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 <unistd.h>
#include <dlfcn.h>
#include <libcli.h>
#include "l2tpns.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;
struct cli_def *cli = NULL;
int cli_quit = 0;
extern int clifd, udpfd, tunfd, snoopfd, ifrfd, cluster_sockfd;
extern int *radfds;
extern struct configt *config;
extern struct 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;

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

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

int debug_session;
int debug_tunnel;
int debug_rb_tail;
FILE *save_config_fh;

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

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_UNPRIVILEGED, 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");

    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, "Temporarily enable interception for a user");
    cli_register_command(cli, NULL, "throttle", cmd_throttle, PRIVILEGE_PRIVILEGED, MODE_EXEC, "Temporarily enable throttling for a user");
    cli_register_command(cli, NULL, "debug", cmd_debug, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Set the level of logging that is shown on the console");

    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 peer");

    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, "Temporarily disable interception for a user");
    cli_register_command(cli, c, "throttle", cmd_no_throttle, PRIVILEGE_PRIVILEGED, MODE_EXEC, "Temporarily disable throttling for a user");
    cli_register_command(cli, c, "debug", cmd_no_debug, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Turn off logging of a certain level of debugging");
    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 peer");

    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, "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, "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");

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

    if (!(f = fopen(CLIUSERS, "r")))
    {
        log(0, 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, 0, "Setting enable password\n");
            }
            else
            {
                cli_allow_user(cli, buf, p);
                log(3, 0, 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, 0, "Error listening on cli port 23: %s\n", strerror(errno));
            return;
    }
    listen(clifd, 10);
}

void cli_do(int sockfd)
{
    int i;

    if (fork()) return;
    if (config->scheduler_fifo)
    {
        int ret;
        struct sched_param params = {0};
        params.sched_priority = 0;
        if ((ret = sched_setscheduler(0, SCHED_OTHER, &params)) == 0)
        {
            log(3, 0, 0, 0, "Dropped FIFO scheduler\n");
        }
        else
        {
            log(0, 0, 0, 0, "Error setting scheduler to OTHER: %s\n", strerror(errno));
            log(0, 0, 0, 0, "This is probably really really bad.\n");
        }
    }

    signal(SIGPIPE, SIG_DFL);
    signal(SIGCHLD, SIG_DFL);
    signal(SIGHUP, SIG_DFL);
    signal(SIGUSR1, SIG_DFL);
    signal(SIGQUIT, SIG_DFL);
    signal(SIGKILL, SIG_DFL);
    signal(SIGALRM, SIG_DFL);
    signal(SIGTERM, SIG_DFL);

    // Close sockets
    if (udpfd) close(udpfd); udpfd = 0;
    if (tunfd) close(tunfd); tunfd = 0;
    if (snoopfd) close(snoopfd); snoopfd = 0;
    for (i = 0; i < config->num_radfds; i++)
        if (radfds[i]) close(radfds[i]);
    if (ifrfd) close(ifrfd); ifrfd = 0;
    if (cluster_sockfd) close(cluster_sockfd); cluster_sockfd = 0;
    if (clifd) close(clifd); clifd = 0;
#ifdef BGP
    for (i = 0; i < BGP_NUM_PEERS; i++)
        if (bgp_peers[i].sock != -1)
            close(bgp_peers[i].sock);
#endif /* BGP */

    {
        int require_auth = 1;
        struct sockaddr_in addr;
        int l = sizeof(addr);
        if (getpeername(sockfd, (struct sockaddr *)&addr, &l) == 0)
        {
            log(3, 0, 0, 0, "Accepted connection to CLI from %s\n", inet_toa(addr.sin_addr.s_addr));
            require_auth = addr.sin_addr.s_addr != inet_addr("127.0.0.1");
        }
        else
            log(0, 0, 0, 0, "getpeername() failed on cli socket. Requiring authentication: %s\n", strerror(errno));

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

    debug_session = 0;
    debug_tunnel = 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(3, 0, 0, 0, "Closed CLI connection\n");
    exit(0);
}

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

void cli_do_file(FILE *fh)
{
    log(3, 0, 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_print(cli, "  %-20s %s", p, desc);
        else
            cli_print(cli, "  %s", p);

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

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

    return CLI_OK;
}

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;
            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, "    User:           %s", session[s].user[0] ? session[s].user : "none");
            cli_print(cli, "    Calling Num:    %s", session[s].calling);
            cli_print(cli, "    Called Num:     %s", session[s].called);
            cli_print(cli, "    Tunnel ID:      %d", session[s].tunnel);
            cli_print(cli, "    IP address:     %s", inet_toa(htonl(session[s].ip)));
            cli_print(cli, "    HSD sid:        %lu", session[s].sid);
            cli_print(cli, "    Idle time:      %u seconds", abs(time_now - session[s].last_packet));
            cli_print(cli, "    Next Recv:      %u", session[s].nr);
            cli_print(cli, "    Next Send:      %u", session[s].ns);
            cli_print(cli, "    Bytes In/Out:   %lu/%lu", (unsigned long)session[s].total_cout, (unsigned long)session[s].total_cin);
            cli_print(cli, "    Pkts In/Out:    %lu/%lu", (unsigned long)session[s].pout, (unsigned long)session[s].pin);
            cli_print(cli, "    MRU:            %d", session[s].mru);
            cli_print(cli, "    Radius Session: %u", session[s].radius);
            cli_print(cli, "    Rx Speed:       %lu", session[s].rx_connect_speed);
            cli_print(cli, "    Tx Speed:       %lu", session[s].tx_connect_speed);
            if (session[s].snoop_ip && session[s].snoop_port)
                cli_print(cli, "        Intercepted:    %s:%d", inet_toa(session[s].snoop_ip), session[s] .snoop_port);
            else
                cli_print(cli, "        Intercepted:    no");
            cli_print(cli, "    Throttled:      %s", session[s].throttle ? "YES" : "no");
            cli_print(cli, "    Walled Garden:  %s", session[s].walled_garden ? "YES" : "no");
            cli_print(cli, "    Filter BucketI: %d", session[s].tbf_in);
            cli_print(cli, "    Filter BucketO: %d", session[s].tbf_out);
        }
        return CLI_OK;
    }

    // Show Summary
    cli_print(cli, "  %s %4s %-32s %-15s %s %s %s %10s %10s %10s %4s %-15s %s",
            "SID",
            "TID",
            "Username",
            "IP",
            "I",
            "T",
            "G",
            "opened",
            "downloaded",
            "uploaded",
            "idle",
            "LAC",
            "CLI");
    for (i = 1; i < MAXSESSION; i++)
    {
        char *userip, *tunnelip;
        if (!session[i].opened) continue;
        userip = strdup(inet_toa(htonl(session[i].ip)));
        tunnelip = strdup(inet_toa(htonl(tunnel[ session[i].tunnel ].ip)));
        cli_print(cli, "%5d %4d %-32s %-15s %s %s %s %10u %10lu %10lu %4u %-15s %s",
                i,
                session[i].tunnel,
                session[i].user[0] ? session[i].user : "*",
                userip,
                (session[i].snoop_ip && session[i].snoop_port) ? "Y" : "N",
                (session[i].throttle) ? "Y" : "N",
                (session[i].walled_garden) ? "Y" : "N",
                abs(time_now - (unsigned long)session[i].opened),
                (unsigned long)session[i].total_cout,
                (unsigned long)session[i].total_cin,
                abs(time_now - (session[i].last_packet ? session[i].last_packet : time_now)),
                tunnelip,
                session[i].calling[0] ? session[i].calling : "*");
        if (userip) free(userip);
        if (tunnelip) free(tunnelip);
    }
    return CLI_OK;
}

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, "        State:          %s", states[tunnel[t].state]);
                cli_print(cli, "        Hostname:       %s", tunnel[t].hostname[0] ? tunnel[t].hostname : "(none)");
                cli_print(cli, "        Remote IP:      %s", inet_toa(htonl(tunnel[t].ip)));
                cli_print(cli, "        Remote Port:    %d", tunnel[t].port);
                cli_print(cli, "        Rx Window:      %u", tunnel[t].window);
                cli_print(cli, "        Next Recv:      %u", tunnel[t].nr);
                cli_print(cli, "        Next Send:      %u", tunnel[t].ns);
                cli_print(cli, "        Queue Len:      %u", tunnel[t].controlc);
                cli_print(cli, "        Last 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, "        Sessions:       %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 || !tunnel[i].hostname[0])) 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)",
                inet_toa(htonl(tunnel[i].ip)),
                states[tunnel[i].state],
                sessions);
    }
    return CLI_OK;
}

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;
}

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 %-8s %-10s %-8s", "Ethernet", "Bytes", "Packets", "Errors");
    cli_print(cli, "%-10s %8lu %8lu %8lu", "RX",
            GET_STAT(tun_rx_bytes),
            GET_STAT(tun_rx_packets),
            GET_STAT(tun_rx_errors));
    cli_print(cli, "%-10s %8lu %8lu %8lu", "TX",
            GET_STAT(tun_tx_bytes),
            GET_STAT(tun_tx_packets),
            GET_STAT(tun_tx_errors));
    cli_print(cli, "");

    cli_print(cli, "%-10s %-8s %-10s %-8s %-8s", "Tunnel", "Bytes", "Packets", "Errors", "Retries");
    cli_print(cli, "%-10s %8lu %8lu %8lu %8lu", "RX",
            GET_STAT(tunnel_rx_bytes),
            GET_STAT(tunnel_rx_packets),
            GET_STAT(tunnel_rx_errors),
            0L);
    cli_print(cli, "%-10s %8lu %8lu %8lu %8lu", "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%lu", "radius_retries",        GET_STAT(radius_retries));
    cli_print(cli, "%-30s%lu", "arp_sent",              GET_STAT(arp_sent));
    cli_print(cli, "%-30s%lu", "packets_snooped",       GET_STAT(packets_snooped));
    cli_print(cli, "%-30s%lu", "tunnel_created",        GET_STAT(tunnel_created));
    cli_print(cli, "%-30s%lu", "session_created",       GET_STAT(session_created));
    cli_print(cli, "%-30s%lu", "tunnel_timeout",        GET_STAT(tunnel_timeout));
    cli_print(cli, "%-30s%lu", "session_timeout",       GET_STAT(session_timeout));
    cli_print(cli, "%-30s%lu", "radius_timeout",        GET_STAT(radius_timeout));
    cli_print(cli, "%-30s%lu", "radius_overflow",       GET_STAT(radius_overflow));
    cli_print(cli, "%-30s%lu", "tunnel_overflow",       GET_STAT(tunnel_overflow));
    cli_print(cli, "%-30s%lu", "session_overflow",      GET_STAT(session_overflow));
    cli_print(cli, "%-30s%lu", "ip_allocated",          GET_STAT(ip_allocated));
    cli_print(cli, "%-30s%lu", "ip_freed",              GET_STAT(ip_freed));
    cli_print(cli, "%-30s%lu", "cluster_forwarded",     GET_STAT(c_forwarded));
    cli_print(cli, "%-30s%lu", "recv_forward",          GET_STAT(recv_forward));


#ifdef STATISTICS
    cli_print(cli, "\n%-30s%-10s", "Counter", "Value");
    cli_print(cli, "-----------------------------------------");
    cli_print(cli, "%-30s%lu", "call_processtun",       GET_STAT(call_processtun));
    cli_print(cli, "%-30s%lu", "call_processipout",     GET_STAT(call_processipout));
    cli_print(cli, "%-30s%lu", "call_processudp",       GET_STAT(call_processudp));
    cli_print(cli, "%-30s%lu", "call_processpap",       GET_STAT(call_processpap));
    cli_print(cli, "%-30s%lu", "call_processchap",      GET_STAT(call_processchap));
    cli_print(cli, "%-30s%lu", "call_processlcp",       GET_STAT(call_processlcp));
    cli_print(cli, "%-30s%lu", "call_processipcp",      GET_STAT(call_processipcp));
    cli_print(cli, "%-30s%lu", "call_processipin",      GET_STAT(call_processipin));
    cli_print(cli, "%-30s%lu", "call_processccp",       GET_STAT(call_processccp));
    cli_print(cli, "%-30s%lu", "call_processrad",       GET_STAT(call_processrad));
    cli_print(cli, "%-30s%lu", "call_sendarp",          GET_STAT(call_sendarp));
    cli_print(cli, "%-30s%lu", "call_sendipcp",         GET_STAT(call_sendipcp));
    cli_print(cli, "%-30s%lu", "call_sendchap",         GET_STAT(call_sendchap));
    cli_print(cli, "%-30s%lu", "call_sessionbyip",      GET_STAT(call_sessionbyip));
    cli_print(cli, "%-30s%lu", "call_sessionbyuser",    GET_STAT(call_sessionbyuser));
    cli_print(cli, "%-30s%lu", "call_tunnelsend",       GET_STAT(call_tunnelsend));
    cli_print(cli, "%-30s%lu", "call_tunnelkill",       GET_STAT(call_tunnelkill));
    cli_print(cli, "%-30s%lu", "call_tunnelshutdown",   GET_STAT(call_tunnelshutdown));
    cli_print(cli, "%-30s%lu", "call_sessionkill",      GET_STAT(call_sessionkill));
    cli_print(cli, "%-30s%lu", "call_sessionshutdown",  GET_STAT(call_sessionshutdown));
    cli_print(cli, "%-30s%lu", "call_sessionsetup",     GET_STAT(call_sessionsetup));
    cli_print(cli, "%-30s%lu", "call_assign_ip_address",GET_STAT(call_assign_ip_address));
    cli_print(cli, "%-30s%lu", "call_free_ip_address",  GET_STAT(call_free_ip_address));
    cli_print(cli, "%-30s%lu", "call_dump_acct_info",   GET_STAT(call_dump_acct_info));
    cli_print(cli, "%-30s%lu", "call_radiussend",       GET_STAT(call_radiussend));
    cli_print(cli, "%-30s%lu", "call_radiusretry",      GET_STAT(call_radiusretry));
#endif
    return CLI_OK;
}

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", 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_md5);
        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;
}

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", inet_toa(config->cluster_master_address));
        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    Y %8d %s",
                inet_toa(htonl(ip_address_pool[i].address)), ip_address_pool[i].session, session[ip_address_pool[i].session].user);

            used++;
        }
        else
        {
            if (ip_address_pool[i].last)
                cli_print(cli, "%-15s    N %8s [%s] %ds",
                    inet_toa(htonl(ip_address_pool[i].address)), "",
                    ip_address_pool[i].user, time_now - ip_address_pool[i].last);
            else if (show_all)
                cli_print(cli, "%-15s    N", inet_toa(htonl(ip_address_pool[i].address)));

            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;
}

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

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);
    }
    else
    {
        cli_print(cli, "Error writing configuration: %s", strerror(errno));
    }
    return CLI_OK;
}

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

    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 == IP)
            cli_print(cli, "set %s %s", config_values[i].key, inet_toa(*(unsigned *)value));
        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]);
        }
    }

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

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",
        "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%5s%6s%9s%9s%4s", "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%5d%6s%9d%9u%4d",
                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;
}

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;
}

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, "Token bucket filters:");
    cli_print(cli, "%-6s %8s %-4s", "ID", "Handle", "Used");
    for (i = 0; i < MAXSESSION; i++)
    {
        if (!session[i].throttle)
            continue;

        cli_print(cli, "%-6d %8d %8d",
            i,
            session[i].tbf_in,
            session[i].tbf_out);
    }
    return CLI_OK;
}

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;
}

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

    cli_print(cli, "Counters cleared");
    SET_STAT(last_reset, time(NULL));
    return CLI_OK;
}

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_print(cli, "Can't do this on a slave.  Do it on %s", inet_toa(config->cluster_master_address));
        return CLI_OK;
    }

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

    for (i = 0; i < argc; i++)
    {
        if (!(s = sessionbyuser(argv[i])))
        {
            cli_print(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;
}

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_print(cli, "Can't do this on a slave.  Do it on %s", inet_toa(config->cluster_master_address));
        return CLI_OK;
    }

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

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

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

        if (tunnel[t].die)
        {
            cli_print(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;
}

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_print(cli, "Can't do this on a slave.  Do it on %s", inet_toa(config->cluster_master_address));
        return CLI_OK;
    }

    if (!argc)
    {
        cli_print(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_print(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_print(cli, "Session %d is not active.", s);
        }
    }

    return CLI_OK;
}

int cmd_snoop(struct cli_def *cli, char *command, char **argv, int argc)
{
    ipt ip;
    u16 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_print(cli, "Can't do this on a slave.  Do it on %s", inet_toa(config->cluster_master_address));
        return CLI_OK;
    }

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

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

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

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

    cli_print(cli, "Snooping user %s to %s:%d", argv[0], inet_toa(session[s].snoop_ip), session[s].snoop_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;
}

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 un-snoop", NULL);

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

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

    for (i = 0; i < argc; i++)
    {
        if (!(s = sessionbyuser(argv[i])))
        {
            cli_print(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;
}

int cmd_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 throttle", NULL);

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

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

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

        if (session[s].throttle)
        {
            cli_print(cli, "User %s already throttled", argv[i]);
            continue;
        }

        cli_print(cli, "Throttling user %s", argv[i]);
        cli_session_actions[s].throttle = config->rl_rate; // could be configurable at some stage
        cli_session_actions[s].action |= CLI_SESS_THROTTLE;
    }

    return CLI_OK;
}

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 un-throttle", NULL);

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

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

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

        if (!session[s].throttle)
        {
            cli_print(cli, "User %s not throttled", argv[i]);
            continue;
        }

        cli_print(cli, "Unthrottling user %s", argv[i]);
        cli_session_actions[s].action |= CLI_SESS_NOTHROTTLE;
    }

    return CLI_OK;
}

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

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

    return CLI_OK;
}

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

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

    return CLI_OK;
}

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_print(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_print(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;
}

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

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;
}

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;
}

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(argv[0], config_values[i].key, len))
                        cli_print(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_print(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:
                    strncpy((char *)value, argv[1], config_values[i].size - 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 IP:
                    *(unsigned *)value = inet_addr(argv[1]);
                    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_print(cli, "Unknown variable type");
                    break;
            }
            config->reload_config = 1;
            return CLI_OK;
        }
    }

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

int regular_stuff(struct cli_def *cli)
{
    int i = debug_rb_tail;
    int reprompt = 0;

#ifdef RINGBUFFER
    while (i != ringbuffer->tail)
    {
        int show_message = 0;

        if (*ringbuffer->buffer[i].message)
        {
            // Always show messages if we are doing general debug
            if (ringbuffer->buffer[i].level == 0 && debug_flags.critical) show_message = 1;
            if (ringbuffer->buffer[i].level == 1 && debug_flags.error) show_message = 1;
            if (ringbuffer->buffer[i].level == 2 && debug_flags.warning) show_message = 1;
            if (ringbuffer->buffer[i].level == 3 && debug_flags.info) show_message = 1;
            if (ringbuffer->buffer[i].level == 4 && debug_flags.calls) show_message = 1;
            if (ringbuffer->buffer[i].level == 5 && debug_flags.data) show_message = 1;
        }

        if (show_message)
        {
            ipt address = htonl(ringbuffer->buffer[i].address);
            char *ipaddr;
            struct in_addr addr;

            memcpy(&addr, &address, sizeof(ringbuffer->buffer[i].address));
            ipaddr = inet_ntoa(addr);

            cli_print(cli, "\r%s-%s-%u-%u %s",
                    debug_levels[(int)ringbuffer->buffer[i].level],
                    ipaddr,
                    ringbuffer->buffer[i].tunnel,
                    ringbuffer->buffer[i].session,
                    ringbuffer->buffer[i].message);

            reprompt = 1;
        }

        if (++i == ringbuffer->tail) break;
        if (i == RINGBUFFER_SIZE) i = 0;
    }

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