main/cli.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2006, Digium, Inc.
 *
 * Mark Spencer <markster@digium.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */
 
/*! \file
 *
 * \brief Standard Command Line Interface
 *
 * \author Mark Spencer <markster@digium.com>
 */
 
/*! \li \ref cli.c uses the configuration file \ref cli_permissions.conf
 * \addtogroup configuration_file Configuration Files
 */
 
/*!
 * \page cli_permissions.conf cli_permissions.conf
 * \verbinclude cli_permissions.conf.sample
 */
 
/*** MODULEINFO
    <support_level>core</support_level>
 ***/
 
#include "asterisk.h"
 
#include "asterisk/_private.h"
#include "asterisk/paths.h" /* use ast_config_AST_MODULE_DIR */
#include <signal.h>
#include <ctype.h>
#include <regex.h>
#include <pwd.h>
#include <grp.h>
 
#include "asterisk/cli.h"
#include "asterisk/linkedlists.h"
#include "asterisk/module.h"
#include "asterisk/pbx.h"
#include "asterisk/channel.h"
#include "asterisk/utils.h"
#include "asterisk/app.h"
#include "asterisk/lock.h"
#include "asterisk/threadstorage.h"
#include "asterisk/logger_category.h"
#include "asterisk/translate.h"
#include "asterisk/bridge.h"
#include "asterisk/stasis_channels.h"
#include "asterisk/stasis_bridges.h"
#include "asterisk/vector.h"
#include "asterisk/stream.h"
 
/*!
 * \brief List of restrictions per user.
 */
struct cli_perm {
    unsigned int permit:1;              /*!< 1=Permit 0=Deny */
    char *command;              /*!< Command name (to apply restrictions) */
    AST_LIST_ENTRY(cli_perm) list;
};
 
AST_LIST_HEAD_NOLOCK(cli_perm_head, cli_perm);
 
/*! \brief list of users to apply restrictions. */
struct usergroup_cli_perm {
    int uid;                /*!< User ID (-1 disabled) */
    int gid;                /*!< Group ID (-1 disabled) */
    struct cli_perm_head *perms;        /*!< List of permissions. */
    AST_LIST_ENTRY(usergroup_cli_perm) list;/*!< List mechanics */
};
/*! \brief CLI permissions config file. */
static const char perms_config[] = "cli_permissions.conf";
/*! \brief Default permissions value 1=Permit 0=Deny */
static int cli_default_perm = 1;
 
/*! \brief mutex used to prevent a user from running the 'cli reload permissions' command while
 * it is already running. */
AST_MUTEX_DEFINE_STATIC(permsconfiglock);
/*! \brief  List of users and permissions. */
static AST_RWLIST_HEAD_STATIC(cli_perms, usergroup_cli_perm);
 
/*!
 * \brief map a debug or verbose level to a module name
 */
struct module_level {
    unsigned int level;
    AST_RWLIST_ENTRY(module_level) entry;
    char module[0];
};
 
AST_RWLIST_HEAD(module_level_list, module_level);
 
/*! lists of module names and their debug/trace levels */
static struct module_level_list debug_modules = AST_RWLIST_HEAD_INIT_VALUE;
static struct module_level_list trace_modules = AST_RWLIST_HEAD_INIT_VALUE;
 
AST_THREADSTORAGE(ast_cli_buf);
 
AST_RWLOCK_DEFINE_STATIC(shutdown_commands_lock);
static AST_VECTOR(, struct ast_cli_entry *) shutdown_commands;
 
/*! \brief Initial buffer size for resulting strings in ast_cli() */
#define AST_CLI_INITLEN   256
 
void ast_cli(int fd, const char *fmt, ...)
{
    int res;
    struct ast_str *buf;
    va_list ap;
 
    if (!(buf = ast_str_thread_get(&ast_cli_buf, AST_CLI_INITLEN)))
        return;
 
    va_start(ap, fmt);
    res = ast_str_set_va(&buf, 0, fmt, ap);
    va_end(ap);
 
    if (res != AST_DYNSTR_BUILD_FAILED) {
        ast_carefulwrite(fd, ast_str_buffer(buf), ast_str_strlen(buf), 100);
    }
}
 
unsigned int ast_debug_get_by_module(const char *module)
{
    struct module_level *ml;
    unsigned int res = 0;
 
    AST_RWLIST_RDLOCK(&debug_modules);
    AST_LIST_TRAVERSE(&debug_modules, ml, entry) {
        if (!strcasecmp(ml->module, module)) {
            res = ml->level;
            break;
        }
    }
    AST_RWLIST_UNLOCK(&debug_modules);
 
    return res;
}
 
unsigned int ast_trace_get_by_module(const char *module)
{
    struct module_level *ml;
    unsigned int res = 0;
 
    AST_RWLIST_RDLOCK(&trace_modules);
    AST_LIST_TRAVERSE(&trace_modules, ml, entry) {
        if (!strcasecmp(ml->module, module)) {
            res = ml->level;
            break;
        }
    }
    AST_RWLIST_UNLOCK(&trace_modules);
 
    return res;
}
 
/*! \internal
 *  \brief Check if the user with 'uid' and 'gid' is allow to execute 'command',
 *     if command starts with '_' then not check permissions, just permit
 *     to run the 'command'.
 *     if uid == -1 or gid == -1 do not check permissions.
 *     if uid == -2 and gid == -2 is because rasterisk client didn't send
 *     the credentials, so the cli_default_perm will be applied.
 *  \param uid User ID.
 *  \param gid Group ID.
 *  \param command Command name to check permissions.
 *  \retval 1 if has permission
 *  \retval 0 if it is not allowed.
 */
static int cli_has_permissions(int uid, int gid, const char *command)
{
    struct usergroup_cli_perm *user_perm;
    struct cli_perm *perm;
    /* set to the default permissions general option. */
    int isallowg = cli_default_perm, isallowu = -1, ispattern;
    regex_t regexbuf;
 
    /* if uid == -1 or gid == -1 do not check permissions.
       if uid == -2 and gid == -2 is because rasterisk client didn't send
       the credentials, so the cli_default_perm will be applied. */
    if ((uid == CLI_NO_PERMS && gid == CLI_NO_PERMS) || command[0] == '_') {
        return 1;
    }
 
    if (gid < 0 && uid < 0) {
        return cli_default_perm;
    }
 
    AST_RWLIST_RDLOCK(&cli_perms);
    AST_LIST_TRAVERSE(&cli_perms, user_perm, list) {
        if (user_perm->gid != gid && user_perm->uid != uid) {
            continue;
        }
        AST_LIST_TRAVERSE(user_perm->perms, perm, list) {
            if (strcasecmp(perm->command, "all") && strncasecmp(perm->command, command, strlen(perm->command))) {
                /* if the perm->command is a pattern, check it against command. */
                ispattern = !regcomp(&regexbuf, perm->command, REG_EXTENDED | REG_NOSUB | REG_ICASE);
                if (ispattern && regexec(&regexbuf, command, 0, NULL, 0)) {
                    regfree(&regexbuf);
                    continue;
                }
                if (!ispattern) {
                    continue;
                }
                regfree(&regexbuf);
            }
            if (user_perm->uid == uid) {
                /* this is a user definition. */
                isallowu = perm->permit;
            } else {
                /* otherwise is a group definition. */
                isallowg = perm->permit;
            }
        }
    }
    AST_RWLIST_UNLOCK(&cli_perms);
    if (isallowu > -1) {
        /* user definition override group definition. */
        isallowg = isallowu;
    }
 
    return isallowg;
}
 
static AST_RWLIST_HEAD_STATIC(helpers, ast_cli_entry);
 
static char *handle_load(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    /* "module load <mod>" */
    switch (cmd) {
    case CLI_INIT:
        e->command = "module load";
        e->usage =
            "Usage: module load <module name>\n"
            "       Loads the specified module into Asterisk.\n";
        return NULL;
 
    case CLI_GENERATE:
        if (a->pos != e->args) {
            return NULL;
        }
        return ast_module_helper(a->line, a->word, a->pos, a->n, a->pos, AST_MODULE_HELPER_LOAD);
    }
    if (a->argc != e->args + 1) {
        return CLI_SHOWUSAGE;
    }
    if (ast_load_resource(a->argv[e->args])) {
        ast_cli(a->fd, "Unable to load module %s\n", a->argv[e->args]);
        return CLI_FAILURE;
    }
    ast_cli(a->fd, "Loaded %s\n", a->argv[e->args]);
    return CLI_SUCCESS;
}
 
static char *handle_reload(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    int x;
 
    switch (cmd) {
    case CLI_INIT:
        e->command = "module reload";
        e->usage =
            "Usage: module reload [module ...]\n"
            "       Reloads configuration files for all listed modules which support\n"
            "       reloading, or for all supported modules if none are listed.\n";
        return NULL;
 
    case CLI_GENERATE:
        return ast_module_helper(a->line, a->word, a->pos, a->n, a->pos, AST_MODULE_HELPER_RELOAD);
    }
    if (a->argc == e->args) {
        ast_module_reload(NULL);
        return CLI_SUCCESS;
    }
    for (x = e->args; x < a->argc; x++) {
        enum ast_module_reload_result res = ast_module_reload(a->argv[x]);
        switch (res) {
        case AST_MODULE_RELOAD_NOT_FOUND:
            ast_cli(a->fd, "No such module '%s'\n", a->argv[x]);
            break;
        case AST_MODULE_RELOAD_NOT_IMPLEMENTED:
            ast_cli(a->fd, "The module '%s' does not support reloads\n", a->argv[x]);
            break;
        case AST_MODULE_RELOAD_QUEUED:
            ast_cli(a->fd, "Asterisk cannot reload a module yet; request queued\n");
            break;
        case AST_MODULE_RELOAD_ERROR:
            ast_cli(a->fd, "The module '%s' reported a reload failure\n", a->argv[x]);
            break;
        case AST_MODULE_RELOAD_IN_PROGRESS:
            ast_cli(a->fd, "A module reload request is already in progress; please be patient\n");
            break;
        case AST_MODULE_RELOAD_UNINITIALIZED:
            ast_cli(a->fd, "The module '%s' was not properly initialized. Before reloading"
                    " the module, you must run \"module load %s\" and fix whatever is"
                    " preventing the module from being initialized.\n", a->argv[x], a->argv[x]);
            break;
        case AST_MODULE_RELOAD_SUCCESS:
            ast_cli(a->fd, "Module '%s' reloaded successfully.\n", a->argv[x]);
            break;
        }
    }
    return CLI_SUCCESS;
}
 
static char *handle_core_reload(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    switch (cmd) {
    case CLI_INIT:
        e->command = "core reload";
        e->usage =
            "Usage: core reload\n"
            "       Execute a global reload.\n";
        return NULL;
 
    case CLI_GENERATE:
        return NULL;
    }
 
    if (a->argc != e->args) {
        return CLI_SHOWUSAGE;
    }
 
    ast_module_reload(NULL);
 
    return CLI_SUCCESS;
}
 
/*!
 * \brief Find the module level setting
 *
 * \param module Module name to look for.
 * \param mll List to search.
 *
 * \retval level struct found on success.
 * \retval NULL not found.
 */
static struct module_level *find_module_level(const char *module, struct module_level_list *mll)
{
    struct module_level *ml;
 
    AST_LIST_TRAVERSE(mll, ml, entry) {
        if (!strcasecmp(ml->module, module))
            return ml;
    }
 
    return NULL;
}
 
static char *complete_number(const char *partial, unsigned int min, unsigned int max, int n)
{
    int i, count = 0;
    unsigned int prospective[2];
    unsigned int part = strtoul(partial, NULL, 10);
    char next[13];
 
    if (part < min || part > max) {
        return NULL;
    }
 
    for (i = 0; i < 21; i++) {
        if (i == 0) {
            prospective[0] = prospective[1] = part;
        } else if (part == 0 && !ast_strlen_zero(partial)) {
            break;
        } else if (i < 11) {
            prospective[0] = prospective[1] = part * 10 + (i - 1);
        } else {
            prospective[0] = (part * 10 + (i - 11)) * 10;
            prospective[1] = prospective[0] + 9;
        }
        if (i < 11 && (prospective[0] < min || prospective[0] > max)) {
            continue;
        } else if (prospective[1] < min || prospective[0] > max) {
            continue;
        }
 
        if (++count > n) {
            if (i < 11) {
                snprintf(next, sizeof(next), "%u", prospective[0]);
            } else {
                snprintf(next, sizeof(next), "%u...", prospective[0] / 10);
            }
            return ast_strdup(next);
        }
    }
    return NULL;
}
 
#define DEBUG_HANDLER 0
#define TRACE_HANDLER 1
#define VERBOSE_HANDLER 2
 
static void status_debug_verbose(struct ast_cli_args *a, int handler, int old_val, int cur_val)
{
    char was_buf[30];
    const char *was;
    const char *what = "";
 
    switch(handler) {
    case DEBUG_HANDLER:
        what = "Core debug";
        break;
    case TRACE_HANDLER:
        what = "Core trace";
        break;
    case VERBOSE_HANDLER:
        what = "Console verbose";
        break;
    }
 
    if (old_val) {
        snprintf(was_buf, sizeof(was_buf), "%d", old_val);
        was = was_buf;
    } else {
        was = "OFF";
    }
 
    if (old_val == cur_val) {
        ast_cli(a->fd, "%s is still %s.\n", what, was);
    } else {
        char now_buf[30];
        const char *now;
 
        if (cur_val) {
            snprintf(now_buf, sizeof(now_buf), "%d", cur_val);
            now = now_buf;
        } else {
            now = "OFF";
        }
 
        ast_cli(a->fd, "%s was %s and is now %s.\n", what, was, now);
    }
}
 
static char *handle_debug_or_trace(int handler, struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    int oldval;
    int newlevel;
    int atleast = 0;
    struct module_level *ml;
    struct module_level_list *modules;
    unsigned int module_option;
    int *core_option;
    const char *handler_name;
 
    if (a->argc <= e->args) {
        return CLI_SHOWUSAGE;
    }
 
    if (handler == DEBUG_HANDLER) {
        modules = &debug_modules;
        module_option = AST_OPT_FLAG_DEBUG_MODULE;
        core_option = &option_debug;
        handler_name = "debug";
    } else {
        modules = &trace_modules;
        module_option = AST_OPT_FLAG_TRACE_MODULE;
        core_option = &option_trace;
        handler_name = "trace";
    }
 
    if (a->argc == e->args + 1 && !strcasecmp(a->argv[e->args], "off")) {
        newlevel = 0;
    } else {
        if (!strcasecmp(a->argv[e->args], "atleast")) {
            atleast = 1;
        }
 
        if (a->argc != e->args + atleast + 1 && a->argc != e->args + atleast + 2) {
            return CLI_SHOWUSAGE;
        }
 
        if (sscanf(a->argv[e->args + atleast], "%30d", &newlevel) != 1) {
            return CLI_SHOWUSAGE;
        }
 
        if (a->argc == e->args + atleast + 2) {
            /* We have specified a module name. */
            char *mod = ast_strdupa(a->argv[e->args + atleast + 1]);
            int mod_len = strlen(mod);
 
            if (3 < mod_len && !strcasecmp(mod + mod_len - 3, ".so")) {
                mod[mod_len - 3] = '\0';
            }
 
            AST_RWLIST_WRLOCK(modules);
 
            ml = find_module_level(mod, modules);
            if (!newlevel) {
                if (!ml) {
                    /* Specified off for a nonexistent entry. */
                    AST_RWLIST_UNLOCK(modules);
                    ast_cli(a->fd, "Core %s is still 0 for '%s'.\n", handler_name, mod);
                    return CLI_SUCCESS;
                }
                AST_RWLIST_REMOVE(modules, ml, entry);
                if (AST_RWLIST_EMPTY(modules)) {
                    ast_clear_flag(&ast_options, module_option);
                }
                AST_RWLIST_UNLOCK(modules);
                ast_cli(a->fd, "Core %s was %u and has been set to 0 for '%s'.\n", handler_name,
                    ml->level, mod);
                ast_free(ml);
                return CLI_SUCCESS;
            }
 
            if (ml) {
                if ((atleast && newlevel < ml->level) || ml->level == newlevel) {
                    ast_cli(a->fd, "Core %s is still %u for '%s'.\n", handler_name, ml->level, mod);
                    AST_RWLIST_UNLOCK(modules);
                    return CLI_SUCCESS;
                }
                oldval = ml->level;
                ml->level = newlevel;
            } else {
                ml = ast_calloc(1, sizeof(*ml) + strlen(mod) + 1);
                if (!ml) {
                    AST_RWLIST_UNLOCK(modules);
                    return CLI_FAILURE;
                }
                oldval = ml->level;
                ml->level = newlevel;
                strcpy(ml->module, mod);
                AST_RWLIST_INSERT_TAIL(modules, ml, entry);
            }
            ast_set_flag(&ast_options, module_option);
 
            ast_cli(a->fd, "Core %s was %d and has been set to %u for '%s'.\n", handler_name,
                oldval, ml->level, ml->module);
 
            AST_RWLIST_UNLOCK(modules);
 
            return CLI_SUCCESS;
        }
    }
 
    /* Update global debug level */
    if (!newlevel) {
        /* Specified level was 0 or off. */
        AST_RWLIST_WRLOCK(modules);
        while ((ml = AST_RWLIST_REMOVE_HEAD(modules, entry))) {
            ast_free(ml);
        }
        ast_clear_flag(&ast_options, AST_OPT_FLAG_DEBUG_MODULE);
        AST_RWLIST_UNLOCK(modules);
    }
    oldval = *core_option;
    if (!atleast || newlevel > *core_option) {
        *core_option = newlevel;
    }
 
    /* Report debug level status */
    status_debug_verbose(a, handler, oldval, *core_option);
 
    return CLI_SUCCESS;
}
 
static char *handle_debug(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    int atleast = 0;
    const char *argv3 = a->argv ? S_OR(a->argv[3], "") : "";
 
    switch (cmd) {
    case CLI_INIT:
        e->command = "core set debug";
        e->usage =
            "Usage: core set debug [atleast] <level> [module]\n"
            "       core set debug off\n"
            "\n"
            "       Sets level of debug messages to be displayed or\n"
            "       sets a module name to display debug messages from.\n"
            "       0 or off means no messages should be displayed.\n"
            "       Equivalent to -d[d[...]] on startup\n";
        return NULL;
 
    case CLI_GENERATE:
        if (!strcasecmp(argv3, "category")) {
            return NULL;
        }
 
        if (!strcasecmp(argv3, "atleast")) {
            atleast = 1;
        }
        if (a->pos == 3 || (a->pos == 4 && atleast)) {
            const char *pos = a->pos == 3 ? argv3 : S_OR(a->argv[4], "");
            int numbermatch = (ast_strlen_zero(pos) || strchr("123456789", pos[0])) ? 0 : 21;
 
            if (a->n < 21 && numbermatch == 0) {
                return complete_number(pos, 0, 0x7fffffff, a->n);
            } else if (pos[0] == '0') {
                if (a->n == 0) {
                    return ast_strdup("0");
                }
            } else if (a->n == (21 - numbermatch)) {
                if (a->pos == 3 && !strncasecmp(argv3, "off", strlen(argv3))) {
                    return ast_strdup("off");
                } else if (a->pos == 3 && !strncasecmp(argv3, "atleast", strlen(argv3))) {
                    return ast_strdup("atleast");
                }
            } else if (a->n == (22 - numbermatch) && a->pos == 3 && ast_strlen_zero(argv3)) {
                return ast_strdup("atleast");
            }
        } else if ((a->pos == 4 && !atleast && strcasecmp(argv3, "off") && strcasecmp(argv3, "channel"))
            || (a->pos == 5 && atleast)) {
            return ast_module_helper(a->line, a->word, a->pos, a->n, a->pos, AST_MODULE_HELPER_RUNNING);
        }
        return NULL;
    }
    /* all the above return, so we proceed with the handler.
     * we are guaranteed to be called with argc >= e->args;
     */
 
    return handle_debug_or_trace(DEBUG_HANDLER, e, cmd, a);
}
 
static char *handle_trace(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    int atleast = 0;
    const char *argv3 = a->argv ? S_OR(a->argv[3], "") : "";
 
    switch (cmd) {
    case CLI_INIT:
        e->command = "core set trace";
        e->usage =
            "Usage: core set trace [atleast] <level> [module]\n"
            "       core set trace off\n"
            "\n"
            "       Sets level of trace messages to be displayed or\n"
            "       sets a module name to display trace messages from.\n"
            "       0 or off means no messages should be displayed.\n";
        return NULL;
 
    case CLI_GENERATE:
        if (!strcasecmp(argv3, "atleast")) {
            atleast = 1;
        }
        if (a->pos == 3 || (a->pos == 4 && atleast)) {
            const char *pos = a->pos == 3 ? argv3 : S_OR(a->argv[4], "");
            int numbermatch = (ast_strlen_zero(pos) || strchr("123456789", pos[0])) ? 0 : 21;
 
            if (a->n < 21 && numbermatch == 0) {
                return complete_number(pos, 0, 0x7fffffff, a->n);
            } else if (pos[0] == '0') {
                if (a->n == 0) {
                    return ast_strdup("0");
                }
            } else if (a->n == (21 - numbermatch)) {
                if (a->pos == 3 && !strncasecmp(argv3, "off", strlen(argv3))) {
                    return ast_strdup("off");
                } else if (a->pos == 3 && !strncasecmp(argv3, "atleast", strlen(argv3))) {
                    return ast_strdup("atleast");
                }
            } else if (a->n == (22 - numbermatch) && a->pos == 3 && ast_strlen_zero(argv3)) {
                return ast_strdup("atleast");
            }
        } else if ((a->pos == 4 && !atleast && strcasecmp(argv3, "off") && strcasecmp(argv3, "channel"))
            || (a->pos == 5 && atleast)) {
            return ast_module_helper(a->line, a->word, a->pos, a->n, a->pos, AST_MODULE_HELPER_RUNNING);
        }
        return NULL;
    }
    /* all the above return, so we proceed with the handler.
     * we are guaranteed to be called with argc >= e->args;
     */
 
    return handle_debug_or_trace(TRACE_HANDLER, e, cmd, a);
}
 
static char *handle_verbose(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    int oldval;
    int newlevel;
    int atleast = 0;
    int silent = 0;
    const char *argv3 = a->argv ? S_OR(a->argv[3], "") : "";
 
    switch (cmd) {
    case CLI_INIT:
        e->command = "core set verbose";
        e->usage =
            "Usage: core set verbose [atleast] <level> [silent]\n"
            "       core set verbose off\n"
            "\n"
            "       Sets level of verbose messages to be displayed.\n"
            "       0 or off means no verbose messages should be displayed.\n"
            "       The silent option means the command does not report what\n"
            "       happened to the verbose level.\n"
            "       Equivalent to -v[v[...]] on startup\n";
        return NULL;
 
    case CLI_GENERATE:
        if (!strcasecmp(argv3, "atleast")) {
            atleast = 1;
        }
        if (a->pos == 3 || (a->pos == 4 && atleast)) {
            const char *pos = a->pos == 3 ? argv3 : S_OR(a->argv[4], "");
            int numbermatch = (ast_strlen_zero(pos) || strchr("123456789", pos[0])) ? 0 : 21;
 
            if (a->n < 21 && numbermatch == 0) {
                return complete_number(pos, 0, 0x7fffffff, a->n);
            } else if (pos[0] == '0') {
                if (a->n == 0) {
                    return ast_strdup("0");
                }
            } else if (a->n == (21 - numbermatch)) {
                if (a->pos == 3 && !strncasecmp(argv3, "off", strlen(argv3))) {
                    return ast_strdup("off");
                } else if (a->pos == 3 && !strncasecmp(argv3, "atleast", strlen(argv3))) {
                    return ast_strdup("atleast");
                }
            } else if (a->n == (22 - numbermatch) && a->pos == 3 && ast_strlen_zero(argv3)) {
                return ast_strdup("atleast");
            }
        } else if ((a->pos == 4 && !atleast && strcasecmp(argv3, "off"))
            || (a->pos == 5 && atleast)) {
            const char *pos = S_OR(a->argv[a->pos], "");
 
            if (a->n == 0 && !strncasecmp(pos, "silent", strlen(pos))) {
                return ast_strdup("silent");
            }
        }
        return NULL;
    }
    /* all the above return, so we proceed with the handler.
     * we are guaranteed to be called with argc >= e->args;
     */
 
    if (a->argc <= e->args) {
        return CLI_SHOWUSAGE;
    }
 
    if (a->argc == e->args + 1 && !strcasecmp(a->argv[e->args], "off")) {
        newlevel = 0;
    } else {
        if (!strcasecmp(a->argv[e->args], "atleast")) {
            atleast = 1;
        }
        if (a->argc == e->args + atleast + 2
            && !strcasecmp(a->argv[e->args + atleast + 1], "silent")) {
            silent = 1;
        }
        if (a->argc != e->args + atleast + silent + 1) {
            return CLI_SHOWUSAGE;
        }
        if (sscanf(a->argv[e->args + atleast], "%30d", &newlevel) != 1) {
            return CLI_SHOWUSAGE;
        }
    }
 
    /* Update verbose level */
    oldval = ast_verb_console_get();
    if (!atleast || newlevel > oldval) {
        ast_verb_console_set(newlevel);
    } else {
        newlevel = oldval;
    }
 
    if (silent) {
        /* Be silent after setting the level. */
        return CLI_SUCCESS;
    }
 
    /* Report verbose level status */
    status_debug_verbose(a, VERBOSE_HANDLER, oldval, newlevel);
 
    return CLI_SUCCESS;
}
 
static char *handle_logger_mute(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    switch (cmd) {
    case CLI_INIT:
        e->command = "logger mute";
        e->usage =
            "Usage: logger mute\n"
            "       Disables logging output to the current console, making it possible to\n"
            "       gather information without being disturbed by scrolling lines.\n";
        return NULL;
    case CLI_GENERATE:
        return NULL;
    }
 
    if (a->argc < 2 || a->argc > 3)
        return CLI_SHOWUSAGE;
 
    if (a->argc == 3 && !strcasecmp(a->argv[2], "silent"))
        ast_console_toggle_mute(a->fd, 1);
    else
        ast_console_toggle_mute(a->fd, 0);
 
    return CLI_SUCCESS;
}
 
static char *handle_refresh(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    /* "module refresh <mod>" */
    switch (cmd) {
    case CLI_INIT:
        e->command = "module refresh";
        e->usage =
            "Usage: module refresh <module name>\n"
            "       Unloads and loads the specified module into Asterisk.\n";
        return NULL;
 
    case CLI_GENERATE:
        if (a->pos != e->args) {
            return NULL;
        }
        return ast_module_helper(a->line, a->word, a->pos, a->n, a->pos, AST_MODULE_HELPER_UNLOAD);
    }
    if (a->argc != e->args + 1) {
        return CLI_SHOWUSAGE;
    }
    if (ast_unload_resource(a->argv[e->args], AST_FORCE_SOFT)) {
        ast_cli(a->fd, "Unable to unload resource %s\n", a->argv[e->args]);
        return CLI_FAILURE;
    }
    if (ast_load_resource(a->argv[e->args])) {
        ast_cli(a->fd, "Unable to load module %s\n", a->argv[e->args]);
        return CLI_FAILURE;
    }
    ast_cli(a->fd, "Unloaded and loaded %s\n", a->argv[e->args]);
    return CLI_SUCCESS;
}
 
static char *handle_unload(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    /* "module unload mod_1 [mod_2 .. mod_N]" */
    int x;
    int force = AST_FORCE_SOFT;
    const char *s;
 
    switch (cmd) {
    case CLI_INIT:
        e->command = "module unload";
        e->usage =
            "Usage: module unload [-f|-h] <module_1> [<module_2> ... ]\n"
            "       Unloads the specified module from Asterisk. The -f\n"
            "       option causes the module to be unloaded even if it is\n"
            "       in use (may cause a crash) and the -h module causes the\n"
            "       module to be unloaded even if the module says it cannot, \n"
            "       which almost always will cause a crash.\n";
        return NULL;
 
    case CLI_GENERATE:
        return ast_module_helper(a->line, a->word, a->pos, a->n, a->pos, AST_MODULE_HELPER_UNLOAD);
    }
    if (a->argc < e->args + 1)
        return CLI_SHOWUSAGE;
    x = e->args;    /* first argument */
    s = a->argv[x];
    if (s[0] == '-') {
        if (s[1] == 'f')
            force = AST_FORCE_FIRM;
        else if (s[1] == 'h')
            force = AST_FORCE_HARD;
        else
            return CLI_SHOWUSAGE;
        if (a->argc < e->args + 2)  /* need at least one module name */
            return CLI_SHOWUSAGE;
        x++;    /* skip this argument */
    }
 
    for (; x < a->argc; x++) {
        if (ast_unload_resource(a->argv[x], force)) {
            ast_cli(a->fd, "Unable to unload resource %s\n", a->argv[x]);
            return CLI_FAILURE;
        }
        ast_cli(a->fd, "Unloaded %s\n", a->argv[x]);
    }
 
    return CLI_SUCCESS;
}
 
#define MODLIST_FORMAT  "%-30s %-40.40s %-10d %-11s %13s\n"
#define MODLIST_FORMAT2 "%-30s %-40.40s %-10s %-11s %13s\n"
 
AST_MUTEX_DEFINE_STATIC(climodentrylock);
static int climodentryfd = -1;
 
static int modlist_modentry(const char *module, const char *description,
        int usecnt, const char *status, const char *like,
        enum ast_module_support_level support_level)
{
    /* Comparing the like with the module */
    if (strcasestr(module, like) ) {
        ast_cli(climodentryfd, MODLIST_FORMAT, module, description, usecnt,
                status, ast_module_support_level_to_string(support_level));
        return 1;
    }
    return 0;
}
 
static void print_uptimestr(int fd, struct timeval timeval, const char *prefix, int printsec)
{
    int x; /* the main part - years, weeks, etc. */
    struct ast_str *out;
 
#define SECOND (1)
#define MINUTE (SECOND*60)
#define HOUR (MINUTE*60)
#define DAY (HOUR*24)
#define WEEK (DAY*7)
#define YEAR (DAY*365)
#define NEEDCOMMA(x) ((x) ? ", " : "")  /* define if we need a comma */
    if (timeval.tv_sec < 0) /* invalid, nothing to show */
        return;
 
    if (printsec)  {    /* plain seconds output */
        ast_cli(fd, "%s%lu\n", prefix, (u_long)timeval.tv_sec);
        return;
    }
    out = ast_str_alloca(256);
    if (timeval.tv_sec > YEAR) {
        x = (timeval.tv_sec / YEAR);
        timeval.tv_sec -= (x * YEAR);
        ast_str_append(&out, 0, "%d year%s%s", x, ESS(x), NEEDCOMMA(timeval.tv_sec));
    }
    if (timeval.tv_sec > WEEK) {
        x = (timeval.tv_sec / WEEK);
        timeval.tv_sec -= (x * WEEK);
        ast_str_append(&out, 0, "%d week%s%s", x, ESS(x), NEEDCOMMA(timeval.tv_sec));
    }
    if (timeval.tv_sec > DAY) {
        x = (timeval.tv_sec / DAY);
        timeval.tv_sec -= (x * DAY);
        ast_str_append(&out, 0, "%d day%s%s", x, ESS(x), NEEDCOMMA(timeval.tv_sec));
    }
    if (timeval.tv_sec > HOUR) {
        x = (timeval.tv_sec / HOUR);
        timeval.tv_sec -= (x * HOUR);
        ast_str_append(&out, 0, "%d hour%s%s", x, ESS(x), NEEDCOMMA(timeval.tv_sec));
    }
    if (timeval.tv_sec > MINUTE) {
        x = (timeval.tv_sec / MINUTE);
        timeval.tv_sec -= (x * MINUTE);
        ast_str_append(&out, 0, "%d minute%s%s", x, ESS(x), NEEDCOMMA(timeval.tv_sec));
    }
    x = timeval.tv_sec;
    if (x > 0 || ast_str_strlen(out) == 0) {
        /* if there is nothing, print 0 seconds */
        ast_str_append(&out, 0, "%d second%s", x, ESS(x));
    }
    ast_cli(fd, "%s%s\n", prefix, ast_str_buffer(out));
}
 
static struct ast_cli_entry *cli_next(struct ast_cli_entry *e)
{
    if (e) {
        return AST_LIST_NEXT(e, list);
    } else {
        return AST_LIST_FIRST(&helpers);
    }
}
 
static char * handle_showuptime(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    struct timeval curtime = ast_tvnow();
    int printsec;
 
    switch (cmd) {
    case CLI_INIT:
        e->command = "core show uptime [seconds]";
        e->usage =
            "Usage: core show uptime [seconds]\n"
            "       Shows Asterisk uptime information.\n"
            "       The seconds word returns the uptime in seconds only.\n";
        return NULL;
 
    case CLI_GENERATE:
        return NULL;
    }
    /* regular handler */
    if (a->argc == e->args && !strcasecmp(a->argv[e->args-1],"seconds"))
        printsec = 1;
    else if (a->argc == e->args-1)
        printsec = 0;
    else
        return CLI_SHOWUSAGE;
    if (ast_startuptime.tv_sec) {
        print_uptimestr(a->fd, ast_tvsub(curtime, ast_startuptime), "System uptime: ", printsec);
    }
    if (ast_lastreloadtime.tv_sec) {
        print_uptimestr(a->fd, ast_tvsub(curtime, ast_lastreloadtime), "Last reload: ", printsec);
    }
    return CLI_SUCCESS;
}
 
static char *handle_modlist(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    const char *like;
 
    switch (cmd) {
    case CLI_INIT:
        e->command = "module show [like]";
        e->usage =
            "Usage: module show [like keyword]\n"
            "       Shows Asterisk modules currently in use, and usage statistics.\n";
        return NULL;
 
    case CLI_GENERATE:
        if (a->pos == e->args) {
            return ast_module_helper(a->line, a->word, a->pos, a->n, a->pos, AST_MODULE_HELPER_LOADED);
        } else {
            return NULL;
        }
    }
    /* all the above return, so we proceed with the handler.
     * we are guaranteed to have argc >= e->args
     */
    if (a->argc == e->args - 1)
        like = "";
    else if (a->argc == e->args + 1 && !strcasecmp(a->argv[e->args-1], "like") )
        like = a->argv[e->args];
    else
        return CLI_SHOWUSAGE;
 
    ast_mutex_lock(&climodentrylock);
    climodentryfd = a->fd; /* global, protected by climodentrylock */
    ast_cli(a->fd, MODLIST_FORMAT2, "Module", "Description", "Use Count", "Status", "Support Level");
    ast_cli(a->fd,"%d modules loaded\n", ast_update_module_list(modlist_modentry, like));
    climodentryfd = -1;
    ast_mutex_unlock(&climodentrylock);
    return CLI_SUCCESS;
}
#undef MODLIST_FORMAT
#undef MODLIST_FORMAT2
 
static char *handle_showcalls(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    static const char * const completions[] = { "seconds", NULL };
    struct timeval curtime = ast_tvnow();
    int showuptime, printsec;
 
    switch (cmd) {
    case CLI_INIT:
        e->command = "core show calls [uptime]";
        e->usage =
            "Usage: core show calls [uptime [seconds]]\n"
            "       Lists number of currently active calls and total number of calls\n"
            "       processed through PBX since last restart. If 'uptime' is specified\n"
            "       the system uptime is also displayed. If 'seconds' is specified in\n"
            "       addition to 'uptime', the system uptime is displayed in seconds.\n";
        return NULL;
 
    case CLI_GENERATE:
        if (a->pos != e->args)
            return NULL;
        return ast_cli_complete(a->word, completions, a->n);
    }
 
    /* regular handler */
    if (a->argc >= e->args && !strcasecmp(a->argv[e->args-1],"uptime")) {
        showuptime = 1;
 
        if (a->argc == e->args+1 && !strcasecmp(a->argv[e->args],"seconds"))
            printsec = 1;
        else if (a->argc == e->args)
            printsec = 0;
        else
            return CLI_SHOWUSAGE;
    } else if (a->argc == e->args-1) {
        showuptime = 0;
        printsec = 0;
    } else
        return CLI_SHOWUSAGE;
 
    if (ast_option_maxcalls) {
        ast_cli(a->fd, "%d of %d max active call%s (%5.2f%% of capacity)\n",
           ast_active_calls(), ast_option_maxcalls, ESS(ast_active_calls()),
           ((double)ast_active_calls() / (double)ast_option_maxcalls) * 100.0);
    } else {
        ast_cli(a->fd, "%d active call%s\n", ast_active_calls(), ESS(ast_active_calls()));
    }
 
    ast_cli(a->fd, "%d call%s processed\n", ast_processed_calls(), ESS(ast_processed_calls()));
 
    if (ast_startuptime.tv_sec && showuptime) {
        print_uptimestr(a->fd, ast_tvsub(curtime, ast_startuptime), "System uptime: ", printsec);
    }
 
    return RESULT_SUCCESS;
}
 
static char *handle_chanlist(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
#define FORMAT_STRING  "%-64.64s %-32.32s %-7.7s %-30.30s\n"
#define FORMAT_STRING2 "%-64.64s %-32.32s %-7.7s %-30.30s\n"
#define CONCISE_FORMAT_STRING  "%s!%s!%s!%d!%s!%s!%s!%s!%s!%s!%d!%s!%s!%s\n"
#define VERBOSE_FORMAT_STRING  "%-80.80s %-24.24s %-24.24s %4d %-7.7s %-12.12s %-25.25s %-15.15s %8.8s %-11.11s %-11.11s %-20.20s\n"
#define VERBOSE_FORMAT_STRING2 "%-80.80s %-24.24s %-24.24s %-4.4s %-7.7s %-12.12s %-25.25s %-15.15s %8.8s %-11.11s %-11.11s %-20.20s\n"
 
    struct ao2_container *channels;
    struct ao2_iterator it_chans;
    struct ast_channel_snapshot *cs;
    int numchans = 0, concise = 0, verbose = 0, count = 0;
 
    switch (cmd) {
    case CLI_INIT:
        e->command = "core show channels [concise|verbose|count]";
        e->usage =
            "Usage: core show channels [concise|verbose|count]\n"
            "       Lists currently defined channels and some information about them. If\n"
            "       'concise' is specified, the format is abridged and in a more easily\n"
            "       machine parsable format. If 'verbose' is specified, the output includes\n"
            "       more and longer fields. If 'count' is specified only the channel and call\n"
            "       count is output.\n";
        return NULL;
 
    case CLI_GENERATE:
        return NULL;
    }
 
    if (a->argc == e->args) {
        if (!strcasecmp(a->argv[e->args-1],"concise"))
            concise = 1;
        else if (!strcasecmp(a->argv[e->args-1],"verbose"))
            verbose = 1;
        else if (!strcasecmp(a->argv[e->args-1],"count"))
            count = 1;
        else
            return CLI_SHOWUSAGE;
    } else if (a->argc != e->args - 1)
        return CLI_SHOWUSAGE;
 
    channels = ast_channel_cache_by_name();
 
    if (!count) {
        if (!concise && !verbose)
            ast_cli(a->fd, FORMAT_STRING2, "Channel", "Location", "State", "Application(Data)");
        else if (verbose)
            ast_cli(a->fd, VERBOSE_FORMAT_STRING2, "Channel", "Context", "Extension", "Priority", "State", "Application", "Data",
                "CallerID", "Duration", "Accountcode", "PeerAccount", "BridgeID");
    }
 
    it_chans = ao2_iterator_init(channels, 0);
    for (; (cs = ao2_iterator_next(&it_chans)); ao2_ref(cs, -1)) {
        char durbuf[16] = "-";
 
        if (!count) {
            if ((concise || verbose)  && !ast_tvzero(cs->base->creationtime)) {
                int duration = (int)(ast_tvdiff_ms(ast_tvnow(), cs->base->creationtime) / 1000);
                if (verbose) {
                    int durh = duration / 3600;
                    int durm = (duration % 3600) / 60;
                    int durs = duration % 60;
                    snprintf(durbuf, sizeof(durbuf), "%02d:%02d:%02d", durh, durm, durs);
                } else {
                    snprintf(durbuf, sizeof(durbuf), "%d", duration);
                }
            }
            if (concise) {
                ast_cli(a->fd, CONCISE_FORMAT_STRING, cs->base->name, cs->dialplan->context, cs->dialplan->exten, cs->dialplan->priority, ast_state2str(cs->state),
                    S_OR(cs->dialplan->appl, "(None)"),
                    cs->dialplan->data,
                    cs->caller->number,
                    cs->base->accountcode,
                    cs->peer->account,
                    cs->amaflags,
                    durbuf,
                    cs->bridge->id,
                    cs->base->uniqueid);
            } else if (verbose) {
                ast_cli(a->fd, VERBOSE_FORMAT_STRING, cs->base->name, cs->dialplan->context, cs->dialplan->exten, cs->dialplan->priority, ast_state2str(cs->state),
                    S_OR(cs->dialplan->appl, "(None)"),
                    S_OR(cs->dialplan->data, "(Empty)"),
                    cs->caller->number,
                    durbuf,
                    cs->base->accountcode,
                    cs->peer->account,
                    cs->bridge->id);
            } else {
                char locbuf[40] = "(None)";
                char appdata[40] = "(None)";
 
                if (!ast_strlen_zero(cs->dialplan->context) && !ast_strlen_zero(cs->dialplan->exten)) {
                    snprintf(locbuf, sizeof(locbuf), "%s@%s:%d", cs->dialplan->exten, cs->dialplan->context, cs->dialplan->priority);
                }
                if (!ast_strlen_zero(cs->dialplan->appl)) {
                    snprintf(appdata, sizeof(appdata), "%s(%s)", cs->dialplan->appl, S_OR(cs->dialplan->data, ""));
                }
                ast_cli(a->fd, FORMAT_STRING, cs->base->name, locbuf, ast_state2str(cs->state), appdata);
            }
        }
    }
    ao2_iterator_destroy(&it_chans);
 
    if (!concise) {
        numchans = ast_active_channels();
        ast_cli(a->fd, "%d active channel%s\n", numchans, ESS(numchans));
        if (ast_option_maxcalls)
            ast_cli(a->fd, "%d of %d max active call%s (%5.2f%% of capacity)\n",
                ast_active_calls(), ast_option_maxcalls, ESS(ast_active_calls()),
                ((double)ast_active_calls() / (double)ast_option_maxcalls) * 100.0);
        else
            ast_cli(a->fd, "%d active call%s\n", ast_active_calls(), ESS(ast_active_calls()));
 
        ast_cli(a->fd, "%d call%s processed\n", ast_processed_calls(), ESS(ast_processed_calls()));
    }
    ao2_ref(channels, -1);
 
    return CLI_SUCCESS;
 
#undef FORMAT_STRING
#undef FORMAT_STRING2
#undef CONCISE_FORMAT_STRING
#undef VERBOSE_FORMAT_STRING
#undef VERBOSE_FORMAT_STRING2
}
 
static char *handle_softhangup(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    struct ast_channel *c = NULL;
    static const char * const completions[] = { "all", NULL };
    char *complete;
 
    switch (cmd) {
    case CLI_INIT:
        e->command = "channel request hangup";
        e->usage =
            "Usage: channel request hangup <channel>|<all>\n"
            "       Request that a channel be hung up. The hangup takes effect\n"
            "       the next time the driver reads or writes from the channel.\n"
            "       If 'all' is specified instead of a channel name, all channels\n"
            "       will see the hangup request.\n";
        return NULL;
    case CLI_GENERATE:
        if (a->pos != e->args) {
            return NULL;
        }
        complete = ast_cli_complete(a->word, completions, a->n);
        if (!complete) {
            complete = ast_complete_channels(a->line, a->word, a->pos, a->n - 1, e->args);
        }
        return complete;
    }
 
    if (a->argc != 4) {
        return CLI_SHOWUSAGE;
    }
 
    if (!strcasecmp(a->argv[3], "all")) {
        struct ast_channel_iterator *iter = NULL;
        if (!(iter = ast_channel_iterator_all_new())) {
            return CLI_FAILURE;
        }
        for (; iter && (c = ast_channel_iterator_next(iter)); ast_channel_unref(c)) {
            ast_channel_lock(c);
            ast_cli(a->fd, "Requested Hangup on channel '%s'\n", ast_channel_name(c));
            ast_softhangup(c, AST_SOFTHANGUP_EXPLICIT);
            ast_channel_unlock(c);
        }
        ast_channel_iterator_destroy(iter);
    } else if ((c = ast_channel_get_by_name(a->argv[3]))) {
        ast_channel_lock(c);
        ast_cli(a->fd, "Requested Hangup on channel '%s'\n", ast_channel_name(c));
        ast_softhangup(c, AST_SOFTHANGUP_EXPLICIT);
        ast_channel_unlock(c);
        c = ast_channel_unref(c);
    } else {
        ast_cli(a->fd, "%s is not a known channel\n", a->argv[3]);
    }
 
    return CLI_SUCCESS;
}
 
/*! \brief handles CLI command 'cli show permissions' */
static char *handle_cli_show_permissions(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    struct usergroup_cli_perm *cp;
    struct cli_perm *perm;
    struct passwd *pw = NULL;
    struct group *gr = NULL;
 
    switch (cmd) {
    case CLI_INIT:
        e->command = "cli show permissions";
        e->usage =
            "Usage: cli show permissions\n"
            "       Shows CLI configured permissions.\n";
        return NULL;
    case CLI_GENERATE:
        return NULL;
    }
 
    AST_RWLIST_RDLOCK(&cli_perms);
    AST_LIST_TRAVERSE(&cli_perms, cp, list) {
        if (cp->uid >= 0) {
            pw = getpwuid(cp->uid);
            if (pw) {
                ast_cli(a->fd, "user: %s [uid=%d]\n", pw->pw_name, cp->uid);
            }
        } else {
            gr = getgrgid(cp->gid);
            if (gr) {
                ast_cli(a->fd, "group: %s [gid=%d]\n", gr->gr_name, cp->gid);
            }
        }
        ast_cli(a->fd, "Permissions:\n");
        if (cp->perms) {
            AST_LIST_TRAVERSE(cp->perms, perm, list) {
                ast_cli(a->fd, "\t%s -> %s\n", perm->permit ? "permit" : "deny", perm->command);
            }
        }
        ast_cli(a->fd, "\n");
    }
    AST_RWLIST_UNLOCK(&cli_perms);
 
    return CLI_SUCCESS;
}
 
/*! \brief handles CLI command 'cli reload permissions' */
static char *handle_cli_reload_permissions(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    switch (cmd) {
    case CLI_INIT:
        e->command = "cli reload permissions";
        e->usage =
            "Usage: cli reload permissions\n"
            "       Reload the 'cli_permissions.conf' file.\n";
        return NULL;
    case CLI_GENERATE:
        return NULL;
    }
 
    ast_cli_perms_init(1);
 
    return CLI_SUCCESS;
}
 
/*! \brief handles CLI command 'cli check permissions' */
static char *handle_cli_check_permissions(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    struct passwd *pw = NULL;
    struct group *gr;
    int gid = -1, uid = -1;
    char command[AST_MAX_ARGS] = "";
    struct ast_cli_entry *ce = NULL;
    int found = 0;
    char *group, *tmp;
 
    switch (cmd) {
    case CLI_INIT:
        e->command = "cli check permissions";
        e->usage =
            "Usage: cli check permissions {<username>|@<groupname>|<username>@<groupname>} [<command>]\n"
            "       Check permissions config for a user@group or list the allowed commands for the specified user.\n"
            "       The username or the groupname may be omitted.\n";
        return NULL;
    case CLI_GENERATE:
        if (a->pos >= 4) {
            return ast_cli_generator(a->line + strlen("cli check permissions") + strlen(a->argv[3]) + 1, a->word, a->n);
        }
        return NULL;
    }
 
    if (a->argc < 4) {
        return CLI_SHOWUSAGE;
    }
 
    tmp = ast_strdupa(a->argv[3]);
    group = strchr(tmp, '@');
    if (group) {
        gr = getgrnam(&group[1]);
        if (!gr) {
            ast_cli(a->fd, "Unknown group '%s'\n", &group[1]);
            return CLI_FAILURE;
        }
        group[0] = '\0';
        gid = gr->gr_gid;
    }
 
    if (!group && ast_strlen_zero(tmp)) {
        ast_cli(a->fd, "You didn't supply a username\n");
    } else if (!ast_strlen_zero(tmp) && !(pw = getpwnam(tmp))) {
        ast_cli(a->fd, "Unknown user '%s'\n", tmp);
        return CLI_FAILURE;
    } else if (pw) {
        uid = pw->pw_uid;
    }
 
    if (a->argc == 4) {
        while ((ce = cli_next(ce))) {
            /* Hide commands that start with '_' */
            if (ce->_full_cmd[0] == '_') {
                continue;
            }
            if (cli_has_permissions(uid, gid, ce->_full_cmd)) {
                ast_cli(a->fd, "%30.30s %s\n", ce->_full_cmd, S_OR(ce->summary, "<no description available>"));
                found++;
            }
        }
        if (!found) {
            ast_cli(a->fd, "You are not allowed to run any command on Asterisk\n");
        }
    } else {
        ast_join(command, sizeof(command), a->argv + 4);
        ast_cli(a->fd, "%s '%s%s%s' is %s to run command: '%s'\n", uid >= 0 ? "User" : "Group", tmp,
            group && uid >= 0 ? "@" : "",
            group ? &group[1] : "",
            cli_has_permissions(uid, gid, command) ? "allowed" : "not allowed", command);
    }
 
    return CLI_SUCCESS;
}
 
static char *__ast_cli_generator(const char *text, const char *word, int state, int lock);
 
static char *handle_commandmatchesarray(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    char *buf, *obuf;
    int buflen = 2048;
    int len = 0;
    char **matches;
    int x, matchlen;
 
    switch (cmd) {
    case CLI_INIT:
        e->command = "_command matchesarray";
        e->usage =
            "Usage: _command matchesarray \"<line>\" text \n"
            "       This function is used internally to help with command completion and should.\n"
            "       never be called by the user directly.\n";
        return NULL;
    case CLI_GENERATE:
        return NULL;
    }
 
    if (a->argc != 4)
        return CLI_SHOWUSAGE;
    if (!(buf = ast_malloc(buflen)))
        return CLI_FAILURE;
    buf[len] = '\0';
    matches = ast_cli_completion_matches(a->argv[2], a->argv[3]);
    if (matches) {
        for (x=0; matches[x]; x++) {
            matchlen = strlen(matches[x]) + 1;
            if (len + matchlen >= buflen) {
                buflen += matchlen * 3;
                obuf = buf;
                if (!(buf = ast_realloc(obuf, buflen)))
                    /* Memory allocation failure...  Just free old buffer and be done */
                    ast_free(obuf);
            }
            if (buf)
                len += sprintf( buf + len, "%s ", matches[x]);
            ast_free(matches[x]);
            matches[x] = NULL;
        }
        ast_free(matches);
    }
 
    if (buf) {
        ast_cli(a->fd, "%s%s",buf, AST_CLI_COMPLETE_EOF);
        ast_free(buf);
    } else
        ast_cli(a->fd, "NULL\n");
 
    return CLI_SUCCESS;
}
 
 
struct channel_set_debug_args {
    int fd;
    int is_off;
};
 
static int channel_set_debug(void *obj, void *arg, void *data, int flags)
{
    struct ast_channel *chan = obj;
    struct channel_set_debug_args *args = data;
 
    ast_channel_lock(chan);
 
    if (!(ast_channel_fin(chan) & DEBUGCHAN_FLAG) || !(ast_channel_fout(chan) & DEBUGCHAN_FLAG)) {
        if (args->is_off) {
            ast_channel_fin_set(chan, ast_channel_fin(chan) & ~DEBUGCHAN_FLAG);
            ast_channel_fout_set(chan, ast_channel_fout(chan) & ~DEBUGCHAN_FLAG);
        } else {
            ast_channel_fin_set(chan, ast_channel_fin(chan) | DEBUGCHAN_FLAG);
            ast_channel_fout_set(chan, ast_channel_fout(chan) | DEBUGCHAN_FLAG);
        }
        ast_cli(args->fd, "Debugging %s on channel %s\n", args->is_off ? "disabled" : "enabled",
                ast_channel_name(chan));
    }
 
    ast_channel_unlock(chan);
 
    return 0;
}
 
static char *handle_core_set_debug_channel(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    struct ast_channel *c = NULL;
    static const char * const completions_all[] = { "all", NULL };
    static const char * const completions_off[] = { "off", NULL };
    struct channel_set_debug_args args = {
        .fd = a->fd,
    };
 
    switch (cmd) {
    case CLI_INIT:
        e->command = "core set debug channel";
        e->usage =
            "Usage: core set debug channel <all|channel> [off]\n"
            "       Enables/disables debugging on all or on a specific channel.\n";
        return NULL;
    case CLI_GENERATE:
        if (a->pos == 4) {
            char *complete = ast_cli_complete(a->word, completions_all, a->n);
            if (!complete) {
                complete = ast_complete_channels(a->line, a->word, a->pos, a->n - 1, e->args);
            }
            return complete;
        } else if (a->pos == 5) {
            return ast_cli_complete(a->word, completions_off, a->n);
        }
 
        return NULL;
    }
 
    if (cmd == (CLI_HANDLER + 1000)) {
        /* called from handle_nodebugchan_deprecated */
        args.is_off = 1;
    } else if (a->argc == e->args + 2) {
        /* 'core set debug channel {all|chan_id}' */
        if (!strcasecmp(a->argv[e->args + 1], "off"))
            args.is_off = 1;
        else
            return CLI_SHOWUSAGE;
    } else if (a->argc != e->args + 1) {
        return CLI_SHOWUSAGE;
    }
 
    if (!strcasecmp("all", a->argv[e->args])) {
        if (args.is_off) {
            global_fin &= ~DEBUGCHAN_FLAG;
            global_fout &= ~DEBUGCHAN_FLAG;
        } else {
            global_fin |= DEBUGCHAN_FLAG;
            global_fout |= DEBUGCHAN_FLAG;
        }
        ast_channel_callback(channel_set_debug, NULL, &args, OBJ_NODATA | OBJ_MULTIPLE);
    } else {
        if ((c = ast_channel_get_by_name(a->argv[e->args]))) {
            channel_set_debug(c, NULL, &args, 0);
            ast_channel_unref(c);
        } else {
            ast_cli(a->fd, "No such channel %s\n", a->argv[e->args]);
        }
    }
 
    ast_cli(a->fd, "Debugging on new channels is %s\n", args.is_off ? "disabled" : "enabled");
 
    return CLI_SUCCESS;
}
 
static char *handle_debug_category(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    const char *argv4 = a->argv ? S_OR(a->argv[4], "") : "";
    int offset = strncasecmp(argv4, "off", strlen(argv4)) ? 0 : 1;
 
    switch (cmd) {
    case CLI_INIT:
        e->command = "core set debug category";
        e->usage =
            "Usage: core set debug category <category>[:<sublevel>] [category[:<sublevel] ...]\n"
            "       core set debug category off [<category> [<category>] ...]\n\n"
            "       Allows enabling and disabling debug logging categories.\n"
            "       When a category is enabled all relevant debug messages are logged\n"
            "       for a given category. However, if a sublevel is specified only\n"
            "       those categorized messages at or below the coded debug sublevel\n"
            "       are logged.\n";
        return NULL;
 
    case CLI_GENERATE:
        if (a->pos < e->args) {
            return NULL;
        }
 
        if (a->pos == 4 && offset) {
            ast_cli_completion_add(ast_strdup("off"));
        }
 
        return ast_debug_category_complete(a->argv + 4,
            a->pos - e->args, a->word, a->n - 1);
    }
 
    if (a->argc <= e->args) {
        return CLI_SHOWUSAGE;
    }
 
    ast_debug_category_set_sublevels(a->argv + e->args + offset, a->argc - e->args - offset,
        offset ? AST_LOG_CATEGORY_DISABLED : AST_LOG_CATEGORY_ENABLED);
 
    return CLI_SUCCESS;
}
 
static char *handle_nodebugchan_deprecated(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    char *res;
 
    switch (cmd) {
    case CLI_INIT:
        e->command = "no debug channel";
        return NULL;
    case CLI_HANDLER:
        /* exit out of switch statement */
        break;
    default:
        return NULL;
    }
 
    if (a->argc != e->args + 1)
        return CLI_SHOWUSAGE;
 
    /* add a 'magic' value to the CLI_HANDLER command so that
     * handle_core_set_debug_channel() will act as if 'off'
     * had been specified as part of the command
     */
    res = handle_core_set_debug_channel(e, CLI_HANDLER + 1000, a);
 
    return res;
}
 
static char *handle_showchan(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    struct ast_channel *chan;
    struct timeval now;
    char cdrtime[256];
    struct ast_str *obuf;/*!< Buffer for CDR variables. */
    struct ast_str *output;/*!< Accumulation buffer for all output. */
    long elapsed_seconds=0;
    int hour=0, min=0, sec=0;
    struct ast_var_t *var;
    struct ast_str *write_transpath = ast_str_alloca(256);
    struct ast_str *read_transpath = ast_str_alloca(256);
    struct ast_str *codec_buf = ast_str_alloca(AST_FORMAT_CAP_NAMES_LEN);
    struct ast_bridge *bridge;
    ast_callid callid;
    char callid_buf[32];
    int stream_num;
 
    switch (cmd) {
    case CLI_INIT:
        e->command = "core show channel";
        e->usage =
            "Usage: core show channel <channel>\n"
            "       Shows lots of information about the specified channel.\n";
        return NULL;
    case CLI_GENERATE:
        return ast_complete_channels(a->line, a->word, a->pos, a->n, 3);
    }
 
    if (a->argc != 4) {
        return CLI_SHOWUSAGE;
    }
 
    obuf = ast_str_thread_get(&ast_str_thread_global_buf, 16);
    if (!obuf) {
        return CLI_FAILURE;
    }
 
    chan = ast_channel_get_by_name(a->argv[3]);
    if (!chan) {
        ast_cli(a->fd, "%s is not a known channel\n", a->argv[3]);
 
        return CLI_SUCCESS;
    }
 
    output = ast_str_create(8192);
    if (!output) {
        ast_channel_unref(chan);
 
        return CLI_FAILURE;
    }
 
    now = ast_tvnow();
    ast_channel_lock(chan);
 
    if (!ast_tvzero(ast_channel_creationtime(chan))) {
        elapsed_seconds = now.tv_sec - ast_channel_creationtime(chan).tv_sec;
        hour = elapsed_seconds / 3600;
        min = (elapsed_seconds % 3600) / 60;
        sec = elapsed_seconds % 60;
        snprintf(cdrtime, sizeof(cdrtime), "%dh%dm%ds", hour, min, sec);
    } else {
        strcpy(cdrtime, "N/A");
    }
 
    ast_translate_path_to_str(ast_channel_writetrans(chan), &write_transpath);
    ast_translate_path_to_str(ast_channel_readtrans(chan), &read_transpath);
 
    bridge = ast_channel_get_bridge(chan);
    callid_buf[0] = '\0';
    callid = ast_channel_callid(chan);
    if (callid) {
        ast_callid_strnprint(callid_buf, sizeof(callid_buf), callid);
    }
 
    ast_str_append(&output, 0,
        " -- General --\n"
        "           Name: %s\n"
        "           Type: %s\n"
        "       UniqueID: %s\n"
        "       LinkedID: %s\n"
        "      Caller ID: %s\n"
        " Caller ID Name: %s\n"
        "Connected Line ID: %s\n"
        "Connected Line ID Name: %s\n"
        "Eff. Connected Line ID: %s\n"
        "Eff. Connected Line ID Name: %s\n"
        "    DNID Digits: %s\n"
        "       Language: %s\n"
        "          State: %s (%u)\n"
        "  NativeFormats: %s\n"
        "    WriteFormat: %s\n"
        "     ReadFormat: %s\n"
        " WriteTranscode: %s %s\n"
        "  ReadTranscode: %s %s\n"
        " Time to Hangup: %ld\n"
        "   Elapsed Time: %s\n"
        "      Bridge ID: %s\n"
        " --   PBX   --\n"
        "        Context: %s\n"
        "      Extension: %s\n"
        "       Priority: %d\n"
        "     Call Group: %llu\n"
        "   Pickup Group: %llu\n"
        "    Application: %s\n"
        "           Data: %s\n"
        " Call Identifer: %s\n",
        ast_channel_name(chan),
        ast_channel_tech(chan)->type,
        ast_channel_uniqueid(chan),
        ast_channel_linkedid(chan),
        S_COR(ast_channel_caller(chan)->id.number.valid,
              ast_channel_caller(chan)->id.number.str, "(N/A)"),
        S_COR(ast_channel_caller(chan)->id.name.valid,
              ast_channel_caller(chan)->id.name.str, "(N/A)"),
        S_COR(ast_channel_connected(chan)->id.number.valid,
              ast_channel_connected(chan)->id.number.str, "(N/A)"),
        S_COR(ast_channel_connected(chan)->id.name.valid,
              ast_channel_connected(chan)->id.name.str, "(N/A)"),
        S_COR(ast_channel_connected_effective_id(chan).number.valid,
              ast_channel_connected_effective_id(chan).number.str, "(N/A)"),
        S_COR(ast_channel_connected_effective_id(chan).name.valid,
              ast_channel_connected_effective_id(chan).name.str, "(N/A)"),
        S_OR(ast_channel_dialed(chan)->number.str, "(N/A)"),
        ast_channel_language(chan),
        ast_state2str(ast_channel_state(chan)),
        ast_channel_state(chan),
        ast_format_cap_get_names(ast_channel_nativeformats(chan), &codec_buf),
        ast_format_get_name(ast_channel_writeformat(chan)),
        ast_format_get_name(ast_channel_readformat(chan)),
        ast_str_strlen(write_transpath) ? "Yes" : "No",
        ast_str_buffer(write_transpath),
        ast_str_strlen(read_transpath) ? "Yes" : "No",
        ast_str_buffer(read_transpath),
        (long)ast_channel_whentohangup(chan)->tv_sec,
        cdrtime,
        bridge ? bridge->uniqueid : "(Not bridged)",
        ast_channel_context(chan),
        ast_channel_exten(chan),
        ast_channel_priority(chan),
        ast_channel_callgroup(chan),
        ast_channel_pickupgroup(chan),
        S_OR(ast_channel_appl(chan), "(N/A)"),
        S_OR(ast_channel_data(chan), "(Empty)"),
        S_OR(callid_buf, "(None)")
        );
 
    ast_str_append(&output, 0, "      Variables:\n");
 
    AST_LIST_TRAVERSE(ast_channel_varshead(chan), var, entries) {
        ast_str_append(&output, 0, "%s=%s\n", ast_var_name(var), ast_var_value(var));
    }
 
    if (!(ast_channel_tech(chan)->properties & AST_CHAN_TP_INTERNAL)
        && ast_cdr_serialize_variables(ast_channel_name(chan), &obuf, '=', '\n')) {
        ast_str_append(&output, 0, "  CDR Variables:\n%s\n", ast_str_buffer(obuf));
    }
 
    ast_str_append(&output, 0, " -- Streams --\n");
    for (stream_num = 0; stream_num < ast_stream_topology_get_count(ast_channel_get_stream_topology(chan)); stream_num++) {
        struct ast_stream *stream = ast_stream_topology_get_stream(ast_channel_get_stream_topology(chan), stream_num);
        struct ast_variable *metadata = ast_stream_get_metadata_list(stream);
 
        ast_str_append(&output, 0,
            "Name: %s\n"
            "    Type: %s\n"
            "    State: %s\n"
            "    Group: %d\n"
            "    Formats: %s\n"
            "    Metadata:\n",
            ast_stream_get_name(stream),
            ast_codec_media_type2str(ast_stream_get_type(stream)),
            ast_stream_state2str(ast_stream_get_state(stream)),
            ast_stream_get_group(stream),
            ast_format_cap_get_names(ast_stream_get_formats(stream), &codec_buf)
            );
 
        if (metadata) {
            struct ast_variable *v;
            for(v = metadata; v; v = v->next) {
                ast_str_append(&output, 0, "        %s: %s\n", v->name, v->value);
            }
            ast_variables_destroy(metadata);
        }
    }
 
    ast_channel_unlock(chan);
 
    ast_cli(a->fd, "%s", ast_str_buffer(output));
    ast_free(output);
 
    ao2_cleanup(bridge);
    ast_channel_unref(chan);
 
    return CLI_SUCCESS;
}
 
/*
 * helper function to generate CLI matches from a fixed set of values.
 * A NULL word is acceptable.
 */
char *ast_cli_complete(const char *word, const char * const choices[], int state)
{
    int i, which = 0, len;
    len = ast_strlen_zero(word) ? 0 : strlen(word);
 
    for (i = 0; choices[i]; i++) {
        if ((!len || !strncasecmp(word, choices[i], len)) && ++which > state) {
            if (state != -1) {
                return ast_strdup(choices[i]);
            }
 
            if (ast_cli_completion_add(ast_strdup(choices[i]))) {
                return NULL;
            }
        }
    }
    return NULL;
}
 
char *ast_complete_channels(const char *line, const char *word, int pos, int state, int rpos)
{
    int wordlen = strlen(word), which = 0;
    struct ao2_container *cached_channels;
    char *ret = NULL;
    struct ao2_iterator iter;
    struct ast_channel_snapshot *snapshot;
 
    if (pos != rpos) {
        return NULL;
    }
 
    cached_channels = ast_channel_cache_all();
 
    iter = ao2_iterator_init(cached_channels, 0);
    for (; (snapshot = ao2_iterator_next(&iter)); ao2_ref(snapshot, -1)) {
        if (!strncasecmp(word, snapshot->base->name, wordlen) && (++which > state)) {
            if (state != -1) {
                ret = ast_strdup(snapshot->base->name);
                ao2_ref(snapshot, -1);
                break;
            }
 
            if (ast_cli_completion_add(ast_strdup(snapshot->base->name))) {
                ao2_ref(snapshot, -1);
                break;
            }
        }
    }
    ao2_iterator_destroy(&iter);
    ao2_ref(cached_channels, -1);
 
    return ret;
}
 
static char *group_show_channels(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
#define FORMAT_STRING  "%-25s  %-20s  %-20s\n"
 
    struct ast_group_info *gi = NULL;
    int numchans = 0;
    regex_t regexbuf;
    int havepattern = 0;
 
    switch (cmd) {
    case CLI_INIT:
        e->command = "group show channels";
        e->usage =
            "Usage: group show channels [pattern]\n"
            "       Lists all currently active channels with channel group(s) specified.\n"
            "       Optional regular expression pattern is matched to group names for each\n"
            "       channel.\n";
        return NULL;
    case CLI_GENERATE:
        return NULL;
    }
 
    if (a->argc < 3 || a->argc > 4)
        return CLI_SHOWUSAGE;
 
    if (a->argc == 4) {
        if (regcomp(&regexbuf, a->argv[3], REG_EXTENDED | REG_NOSUB))
            return CLI_SHOWUSAGE;
        havepattern = 1;
    }
 
    ast_cli(a->fd, FORMAT_STRING, "Channel", "Group", "Category");
 
    ast_app_group_list_rdlock();
 
    gi = ast_app_group_list_head();
    while (gi) {
        if (!havepattern || !regexec(&regexbuf, gi->group, 0, NULL, 0)) {
            ast_cli(a->fd, FORMAT_STRING, ast_channel_name(gi->chan), gi->group, (ast_strlen_zero(gi->category) ? "(default)" : gi->category));
            numchans++;
        }
        gi = AST_LIST_NEXT(gi, group_list);
    }
 
    ast_app_group_list_unlock();
 
    if (havepattern)
        regfree(&regexbuf);
 
    ast_cli(a->fd, "%d active channel%s\n", numchans, ESS(numchans));
    return CLI_SUCCESS;
#undef FORMAT_STRING
}
 
static char *handle_cli_wait_fullybooted(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    switch (cmd) {
    case CLI_INIT:
        e->command = "core waitfullybooted";
        e->usage =
            "Usage: core waitfullybooted\n"
            "   Wait until Asterisk has fully booted.\n";
        return NULL;
    case CLI_GENERATE:
        return NULL;
    }
 
    while (!ast_test_flag(&ast_options, AST_OPT_FLAG_FULLY_BOOTED)) {
        usleep(100);
    }
 
    ast_cli(a->fd, "Asterisk has fully booted.\n");
 
    return CLI_SUCCESS;
}
 
 
#ifdef HAVE_MALLOC_TRIM
 
/*!
 * \internal
 * \brief Attempt to reclaim unused heap memory.
 *
 * Users have reported that asterisk will sometimes be killed because it can't allocate
 * more than around 3G of memory on a 32 bit system.
 *
 * Using malloc_trim() will help us to determine if it's because there's a leak or because
 * the heap is so fragmented that there isn't enough contiguous memory available.
 *
 * \note malloc_trim() is a GNU extension and is therefore not portable.
 */
static char *handle_cli_malloc_trim(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    extern int malloc_trim(size_t __pad) __THROW;
 
    switch (cmd) {
    case CLI_INIT:
        e->command = "malloc trim";
        e->usage =
            "Usage: malloc trim\n"
            "       Try to give excess memory back to the OS.\n";
        return NULL;
    case CLI_GENERATE:
        return NULL;
    }
 
    if (malloc_trim(0)) {
        ast_cli(a->fd, "Returned some memory to the OS.\n");
    } else {
        ast_cli(a->fd, "No memory returned to the OS.\n");
    }
 
    return CLI_SUCCESS;
}
 
#endif
 
static char *handle_help(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
 
static struct ast_cli_entry cli_cli[] = {
    AST_CLI_DEFINE(handle_commandmatchesarray, "Returns command matches array"),
 
    AST_CLI_DEFINE(handle_debug_category, "Enable/disable debugging categories"),
 
    AST_CLI_DEFINE(handle_debug, "Set level of debug chattiness"),
    AST_CLI_DEFINE(handle_trace, "Set level of trace chattiness"),
    AST_CLI_DEFINE(handle_verbose, "Set level of verbose chattiness"),
 
    AST_CLI_DEFINE(handle_help, "Display help list, or specific help on a command"),
    AST_CLI_DEFINE(handle_logger_mute, "Toggle logging output to a console"),
 
    AST_CLI_DEFINE(handle_modlist, "List modules and info"),
    AST_CLI_DEFINE(handle_load, "Load a module by name"),
    AST_CLI_DEFINE(handle_reload, "Reload configuration for a module"),
    AST_CLI_DEFINE(handle_core_reload, "Global reload"),
    AST_CLI_DEFINE(handle_unload, "Unload a module by name"),
    AST_CLI_DEFINE(handle_refresh, "Completely unloads and loads a module by name"),
 
    AST_CLI_DEFINE(handle_showuptime, "Show uptime information"),
 
    AST_CLI_DEFINE(handle_cli_reload_permissions, "Reload CLI permissions config"),
    AST_CLI_DEFINE(handle_cli_show_permissions, "Show CLI permissions"),
    AST_CLI_DEFINE(handle_cli_check_permissions, "Try a permissions config for a user"),
    AST_CLI_DEFINE(handle_cli_wait_fullybooted, "Wait for Asterisk to be fully booted"),
 
#ifdef HAVE_MALLOC_TRIM
    AST_CLI_DEFINE(handle_cli_malloc_trim, "Return excess memory to the OS"),
#endif
 
};
 
static struct ast_cli_entry cli_channels_cli[] = {
    AST_CLI_DEFINE(handle_nodebugchan_deprecated, "Disable debugging on channel(s)"),
    AST_CLI_DEFINE(handle_chanlist, "Display information on channels"),
    AST_CLI_DEFINE(handle_showcalls, "Display information on calls"),
    AST_CLI_DEFINE(handle_showchan, "Display information on a specific channel"),
    AST_CLI_DEFINE(handle_core_set_debug_channel, "Enable/disable debugging on a channel"),
    AST_CLI_DEFINE(group_show_channels, "Display active channels with group(s)"),
    AST_CLI_DEFINE(handle_softhangup, "Request a hangup on a given channel"),
};
 
/*!
 * Some regexp characters in cli arguments are reserved and used as separators.
 */
static const char cli_rsvd[] = "[]{}|*%";
 
/*!
 * initialize the _full_cmd string and related parameters,
 * return 0 on success, -1 on error.
 */
static int set_full_cmd(struct ast_cli_entry *e)
{
    int i;
    char buf[80];
 
    ast_join(buf, sizeof(buf), e->cmda);
    e->_full_cmd = ast_strdup(buf);
    if (!e->_full_cmd) {
        ast_log(LOG_WARNING, "-- cannot allocate <%s>\n", buf);
        return -1;
    }
    e->cmdlen = strcspn(e->_full_cmd, cli_rsvd);
    for (i = 0; e->cmda[i]; i++)
        ;
    e->args = i;
    return 0;
}
 
/*! \brief cleanup (free) cli_perms linkedlist. */
static void destroy_user_perms(void)
{
    struct cli_perm *perm;
    struct usergroup_cli_perm *user_perm;
 
    AST_RWLIST_WRLOCK(&cli_perms);
    while ((user_perm = AST_LIST_REMOVE_HEAD(&cli_perms, list))) {
        while ((perm = AST_LIST_REMOVE_HEAD(user_perm->perms, list))) {
            ast_free(perm->command);
            ast_free(perm);
        }
        ast_free(user_perm);
    }
    AST_RWLIST_UNLOCK(&cli_perms);
}
 
int ast_cli_perms_init(int reload)
{
    struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };
    struct ast_config *cfg;
    char *cat = NULL;
    struct ast_variable *v;
    struct usergroup_cli_perm *user_group, *cp_entry;
    struct cli_perm *perm = NULL;
    struct passwd *pw;
    struct group *gr;
 
    if (ast_mutex_trylock(&permsconfiglock)) {
        ast_log(LOG_NOTICE, "You must wait until last 'cli reload permissions' command finish\n");
        return 1;
    }
 
    cfg = ast_config_load2(perms_config, "" /* core, can't reload */, config_flags);
    if (!cfg) {
        ast_mutex_unlock(&permsconfiglock);
        return 1;
    } else if (cfg == CONFIG_STATUS_FILEUNCHANGED) {
        ast_mutex_unlock(&permsconfiglock);
        return 0;
    }
 
    /* free current structures. */
    destroy_user_perms();
 
    while ((cat = ast_category_browse(cfg, cat))) {
        if (!strcasecmp(cat, "general")) {
            /* General options */
            for (v = ast_variable_browse(cfg, cat); v; v = v->next) {
                if (!strcasecmp(v->name, "default_perm")) {
                    cli_default_perm = (!strcasecmp(v->value, "permit")) ? 1: 0;
                }
            }
            continue;
        }
 
        /* users or groups */
        gr = NULL, pw = NULL;
        if (cat[0] == '@') {
            /* This is a group */
            gr = getgrnam(&cat[1]);
            if (!gr) {
                ast_log (LOG_WARNING, "Unknown group '%s'\n", &cat[1]);
                continue;
            }
        } else {
            /* This is a user */
            pw = getpwnam(cat);
            if (!pw) {
                ast_log (LOG_WARNING, "Unknown user '%s'\n", cat);
                continue;
            }
        }
        user_group = NULL;
        /* Check for duplicates */
        AST_RWLIST_WRLOCK(&cli_perms);
        AST_LIST_TRAVERSE(&cli_perms, cp_entry, list) {
            if ((pw && cp_entry->uid == pw->pw_uid) || (gr && cp_entry->gid == gr->gr_gid)) {
                /* if it is duplicated, just added this new settings, to
                the current list. */
                user_group = cp_entry;
                break;
            }
        }
        AST_RWLIST_UNLOCK(&cli_perms);
 
        if (!user_group) {
            /* alloc space for the new user config. */
            user_group = ast_calloc(1, sizeof(*user_group));
            if (!user_group) {
                continue;
            }
            user_group->uid = (pw ? pw->pw_uid : -1);
            user_group->gid = (gr ? gr->gr_gid : -1);
            user_group->perms = ast_calloc(1, sizeof(*user_group->perms));
            if (!user_group->perms) {
                ast_free(user_group);
                continue;
            }
        }
        for (v = ast_variable_browse(cfg, cat); v; v = v->next) {
            if (ast_strlen_zero(v->value)) {
                /* we need to check this condition cause it could break security. */
                ast_log(LOG_WARNING, "Empty permit/deny option in user '%s'\n", cat);
                continue;
            }
            if (!strcasecmp(v->name, "permit")) {
                perm = ast_calloc(1, sizeof(*perm));
                if (perm) {
                    perm->permit = 1;
                    perm->command = ast_strdup(v->value);
                }
            } else if (!strcasecmp(v->name, "deny")) {
                perm = ast_calloc(1, sizeof(*perm));
                if (perm) {
                    perm->permit = 0;
                    perm->command = ast_strdup(v->value);
                }
            } else {
                /* up to now, only 'permit' and 'deny' are possible values. */
                ast_log(LOG_WARNING, "Unknown '%s' option\n", v->name);
                continue;
            }
            if (perm) {
                /* Added the permission to the user's list. */
                AST_LIST_INSERT_TAIL(user_group->perms, perm, list);
                perm = NULL;
            }
        }
        AST_RWLIST_WRLOCK(&cli_perms);
        AST_RWLIST_INSERT_TAIL(&cli_perms, user_group, list);
        AST_RWLIST_UNLOCK(&cli_perms);
    }
 
    ast_config_destroy(cfg);
    ast_mutex_unlock(&permsconfiglock);
    return 0;
}
 
static void cli_shutdown(void)
{
    ast_cli_unregister_multiple(cli_cli, ARRAY_LEN(cli_cli));
}
 
static void cli_channels_shutdown(void)
{
    ast_cli_unregister_multiple(cli_channels_cli, ARRAY_LEN(cli_channels_cli));
}
 
/*! \brief initialize the _full_cmd string in * each of the builtins. */
void ast_builtins_init(void)
{
    AST_VECTOR_INIT(&shutdown_commands, 0);
    ast_cli_register_multiple(cli_cli, ARRAY_LEN(cli_cli));
    ast_register_cleanup(cli_shutdown);
}
 
void ast_cli_channels_init(void)
{
    ast_cli_register_multiple(cli_channels_cli, ARRAY_LEN(cli_channels_cli));
    ast_register_cleanup(cli_channels_shutdown);
}
 
/*!
 * match a word in the CLI entry.
 * returns -1 on mismatch, 0 on match of an optional word,
 * 1 on match of a full word.
 *
 * The pattern can be
 *   any_word           match for equal
 *   [foo|bar|baz]      optionally, one of these words
 *   {foo|bar|baz}      exactly, one of these words
 *   %                  any word
 */
static int word_match(const char *cmd, const char *cli_word)
{
    int l;
    char *pos;
 
    if (ast_strlen_zero(cmd) || ast_strlen_zero(cli_word))
        return -1;
    if (!strchr(cli_rsvd, cli_word[0])) /* normal match */
        return (strcasecmp(cmd, cli_word) == 0) ? 1 : -1;
    l = strlen(cmd);
    /* wildcard match - will extend in the future */
    if (l > 0 && cli_word[0] == '%') {
        return 1;   /* wildcard */
    }
 
    /* Start a search for the command entered against the cli word in question */
    pos = strcasestr(cli_word, cmd);
    while (pos) {
 
        /*
         *Check if the word matched with is surrounded by reserved characters on both sides
         * and isn't at the beginning of the cli_word since that would make it check in a location we shouldn't know about.
         * If it is surrounded by reserved chars and isn't at the beginning, it's a match.
         */
        if (pos != cli_word && strchr(cli_rsvd, pos[-1]) && strchr(cli_rsvd, pos[l])) {
            return 1;   /* valid match */
        }
 
        /* Ok, that one didn't match, strcasestr to the next appearance of the command and start over.*/
        pos = strcasestr(pos + 1, cmd);
    }
    /* If no matches were found over the course of the while loop, we hit the end of the string. It's a mismatch. */
    return -1;
}
 
/*! \brief if word is a valid prefix for token, returns the pos-th
 * match as a malloced string, or NULL otherwise.
 * Always tell in *actual how many matches we got.
 */
static char *is_prefix(const char *word, const char *token,
    int pos, int *actual)
{
    int lw;
    char *s, *t1;
 
    *actual = 0;
    if (ast_strlen_zero(token))
        return NULL;
    if (ast_strlen_zero(word))
        word = "";  /* dummy */
    lw = strlen(word);
    if (strcspn(word, cli_rsvd) != lw)
        return NULL;    /* no match if word has reserved chars */
    if (strchr(cli_rsvd, token[0]) == NULL) {   /* regular match */
        if (strncasecmp(token, word, lw))   /* no match */
            return NULL;
        *actual = 1;
        return (pos != 0) ? NULL : ast_strdup(token);
    }
    /* now handle regexp match */
 
    /* Wildcard always matches, so we never do is_prefix on them */
 
    t1 = ast_strdupa(token + 1);    /* copy, skipping first char */
    while (pos >= 0 && (s = strsep(&t1, cli_rsvd)) && *s) {
        if (*s == '%')  /* wildcard */
            continue;
        if (strncasecmp(s, word, lw))   /* no match */
            continue;
        (*actual)++;
        if (pos-- == 0)
            return ast_strdup(s);
    }
    return NULL;
}
 
/*!
 * \internal
 * \brief locate a cli command in the 'helpers' list (which must be locked).
 *     The search compares word by word taking care of regexps in e->cmda
 *     This function will return NULL when nothing is matched, or the ast_cli_entry that matched.
 * \param cmds
 * \param match_type has 3 possible values:
 *      0       returns if the search key is equal or longer than the entry.
 *              note that trailing optional arguments are skipped.
 *      -1      true if the mismatch is on the last word XXX not true!
 *      1       true only on complete, exact match.
 *
 */
static struct ast_cli_entry *find_cli(const char * const cmds[], int match_type)
{
    int matchlen = -1;  /* length of longest match so far */
    struct ast_cli_entry *cand = NULL, *e=NULL;
 
    while ( (e = cli_next(e)) ) {
        /* word-by word regexp comparison */
        const char * const *src = cmds;
        const char * const *dst = e->cmda;
        int n = 0;
        for (;; dst++, src += n) {
            n = word_match(*src, *dst);
            if (n < 0)
                break;
        }
        if (ast_strlen_zero(*dst) || ((*dst)[0] == '[' && ast_strlen_zero(dst[1]))) {
            /* no more words in 'e' */
            if (ast_strlen_zero(*src))  /* exact match, cannot do better */
                break;
            /* Here, cmds has more words than the entry 'e' */
            if (match_type != 0)    /* but we look for almost exact match... */
                continue;   /* so we skip this one. */
            /* otherwise we like it (case 0) */
        } else {    /* still words in 'e' */
            if (ast_strlen_zero(*src))
                continue; /* cmds is shorter than 'e', not good */
            /* Here we have leftover words in cmds and 'e',
             * but there is a mismatch. We only accept this one if match_type == -1
             * and this is the last word for both.
             */
            if (match_type != -1 || !ast_strlen_zero(src[1]) ||
                !ast_strlen_zero(dst[1]))   /* not the one we look for */
                continue;
            /* good, we are in case match_type == -1 and mismatch on last word */
        }
        if (src - cmds > matchlen) {    /* remember the candidate */
            matchlen = src - cmds;
            cand = e;
        }
    }
 
    return e ? e : cand;
}
 
static char *find_best(const char *argv[])
{
    static char cmdline[80];
    int x;
    /* See how close we get, then print the candidate */
    const char *myargv[AST_MAX_CMD_LEN] = { NULL, };
 
    AST_RWLIST_RDLOCK(&helpers);
    for (x = 0; argv[x]; x++) {
        myargv[x] = argv[x];
        if (!find_cli(myargv, -1))
            break;
    }
    AST_RWLIST_UNLOCK(&helpers);
    ast_join(cmdline, sizeof(cmdline), myargv);
    return cmdline;
}
 
static int cli_is_registered(struct ast_cli_entry *e)
{
    struct ast_cli_entry *cur = NULL;
 
    while ((cur = cli_next(cur))) {
        if (cur == e) {
            return 1;
        }
    }
    return 0;
}
 
static void remove_shutdown_command(struct ast_cli_entry *e)
{
    ast_rwlock_wrlock(&shutdown_commands_lock);
    AST_VECTOR_REMOVE_ELEM_UNORDERED(&shutdown_commands, e, AST_VECTOR_ELEM_CLEANUP_NOOP);
    ast_rwlock_unlock(&shutdown_commands_lock);
}
 
int ast_cli_unregister(struct ast_cli_entry *e)
{
    if (e->inuse) {
        ast_log(LOG_WARNING, "Can't remove command that is in use\n");
    } else {
        AST_RWLIST_WRLOCK(&helpers);
        AST_RWLIST_REMOVE(&helpers, e, list);
        AST_RWLIST_UNLOCK(&helpers);
        remove_shutdown_command(e);
        ast_free(e->_full_cmd);
        e->_full_cmd = NULL;
        if (e->handler) {
            /* this is a new-style entry. Reset fields and free memory. */
            char *cmda = (char *) e->cmda;
            memset(cmda, '\0', sizeof(e->cmda));
            ast_free(e->command);
            e->command = NULL;
            e->usage = NULL;
        }
    }
    return 0;
}
 
int __ast_cli_register(struct ast_cli_entry *e, struct ast_module *module)
{
    struct ast_cli_entry *cur;
    int i, lf, ret = -1;
 
    struct ast_cli_args a;  /* fake argument */
    char **dst = (char **)e->cmda;  /* need to cast as the entry is readonly */
    char *s;
 
    AST_RWLIST_WRLOCK(&helpers);
 
    if (cli_is_registered(e)) {
        ast_log(LOG_WARNING, "Command '%s' already registered (the same ast_cli_entry)\n",
            S_OR(e->_full_cmd, e->command));
        ret = 0;  /* report success */
        goto done;
    }
 
    memset(&a, '\0', sizeof(a));
 
    e->module = module;
    /* No module reference needed here, the module called us. */
    e->handler(e, CLI_INIT, &a);
 
    /* XXX check that usage and command are filled up */
    s = ast_skip_blanks(e->command);
    s = e->command = ast_strdup(s);
    for (i=0; !ast_strlen_zero(s) && i < AST_MAX_CMD_LEN-1; i++) {
        *dst++ = s; /* store string */
        s = ast_skip_nonblanks(s);
        if (*s == '\0') /* we are done */
            break;
        *s++ = '\0';
        s = ast_skip_blanks(s);
    }
    *dst++ = NULL;
 
    if (find_cli(e->cmda, 1)) {
        ast_log(LOG_WARNING, "Command '%s' already registered (or something close enough)\n",
            S_OR(e->_full_cmd, e->command));
        goto done;
    }
    if (set_full_cmd(e)) {
        ast_log(LOG_WARNING, "Error registering CLI Command '%s'\n",
            S_OR(e->_full_cmd, e->command));
        goto done;
    }
 
    lf = e->cmdlen;
    AST_RWLIST_TRAVERSE_SAFE_BEGIN(&helpers, cur, list) {
        int len = cur->cmdlen;
        if (lf < len)
            len = lf;
        if (strncasecmp(e->_full_cmd, cur->_full_cmd, len) < 0) {
            AST_RWLIST_INSERT_BEFORE_CURRENT(e, list);
            break;
        }
    }
    AST_RWLIST_TRAVERSE_SAFE_END;
 
    if (!cur)
        AST_RWLIST_INSERT_TAIL(&helpers, e, list);
    ret = 0;    /* success */
 
done:
    AST_RWLIST_UNLOCK(&helpers);
    if (ret) {
        ast_free(e->command);
        e->command = NULL;
    }
 
    return ret;
}
 
/*
 * register/unregister an array of entries.
 */
int __ast_cli_register_multiple(struct ast_cli_entry *e, int len, struct ast_module *module)
{
    int i, res = 0;
 
    for (i = 0; i < len; i++) {
        res |= __ast_cli_register(e + i, module);
    }
 
    return res;
}
 
int ast_cli_unregister_multiple(struct ast_cli_entry *e, int len)
{
    int i, res = 0;
 
    for (i = 0; i < len; i++)
        res |= ast_cli_unregister(e + i);
 
    return res;
}
 
 
/*! \brief helper for final part of handle_help
 *  if locked = 1, assume the list is already locked
 */
static char *help1(int fd, const char * const match[], int locked)
{
    char matchstr[80] = "";
    struct ast_cli_entry *e = NULL;
    int len = 0;
    int found = 0;
 
    if (match) {
        ast_join(matchstr, sizeof(matchstr), match);
        len = strlen(matchstr);
    }
    if (!locked)
        AST_RWLIST_RDLOCK(&helpers);
    while ( (e = cli_next(e)) ) {
        /* Hide commands that start with '_' */
        if (e->_full_cmd[0] == '_')
            continue;
        if (match && strncasecmp(matchstr, e->_full_cmd, len))
            continue;
        ast_cli(fd, "%-30s -- %s\n", e->_full_cmd,
            S_OR(e->summary, "<no description available>"));
        found++;
    }
    if (!locked)
        AST_RWLIST_UNLOCK(&helpers);
    if (!found && matchstr[0])
        ast_cli(fd, "No such command '%s'.\n", matchstr);
    return CLI_SUCCESS;
}
 
static char *handle_help(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    char fullcmd[80];
    struct ast_cli_entry *my_e;
    char *res = CLI_SUCCESS;
 
    if (cmd == CLI_INIT) {
        e->command = "core show help";
        e->usage =
            "Usage: core show help [topic]\n"
            "       When called with a topic as an argument, displays usage\n"
            "       information on the given command. If called without a\n"
            "       topic, it provides a list of commands.\n";
        return NULL;
 
    } else if (cmd == CLI_GENERATE) {
        /* skip first 14 or 15 chars, "core show help " */
        int l = strlen(a->line);
 
        if (l > 15) {
            l = 15;
        }
        /* XXX watch out, should stop to the non-generator parts */
        return __ast_cli_generator(a->line + l, a->word, a->n, 0);
    }
    if (a->argc == e->args) {
        return help1(a->fd, NULL, 0);
    }
 
    AST_RWLIST_RDLOCK(&helpers);
    my_e = find_cli(a->argv + 3, 1);    /* try exact match first */
    if (!my_e) {
        res = help1(a->fd, a->argv + 3, 1 /* locked */);
        AST_RWLIST_UNLOCK(&helpers);
        return res;
    }
    if (my_e->usage)
        ast_cli(a->fd, "%s", my_e->usage);
    else {
        ast_join(fullcmd, sizeof(fullcmd), a->argv + 3);
        ast_cli(a->fd, "No help text available for '%s'.\n", fullcmd);
    }
    AST_RWLIST_UNLOCK(&helpers);
    return res;
}
 
static char *parse_args(const char *s, int *argc, const char *argv[], int max, int *trailingwhitespace)
{
    char *duplicate, *cur;
    int x = 0;
    int quoted = 0;
    int escaped = 0;
    int whitespace = 1;
    int dummy = 0;
 
    if (trailingwhitespace == NULL)
        trailingwhitespace = &dummy;
    *trailingwhitespace = 0;
    if (s == NULL)  /* invalid, though! */
        return NULL;
    /* make a copy to store the parsed string */
    if (!(duplicate = ast_strdup(s)))
        return NULL;
 
    cur = duplicate;
 
    /* Remove leading spaces from the command */
    while (isspace(*s)) {
        cur++;
        s++;
    }
 
    /* scan the original string copying into cur when needed */
    for (; *s ; s++) {
        if (x >= max - 1) {
            ast_log(LOG_WARNING, "Too many arguments, truncating at %s\n", s);
            break;
        }
        if (*s == '"' && !escaped) {
            quoted = !quoted;
            if (quoted && whitespace) {
                /* start a quoted string from previous whitespace: new argument */
                argv[x++] = cur;
                whitespace = 0;
            }
        } else if ((*s == ' ' || *s == '\t') && !(quoted || escaped)) {
            /* If we are not already in whitespace, and not in a quoted string or
               processing an escape sequence, and just entered whitespace, then
               finalize the previous argument and remember that we are in whitespace
            */
            if (!whitespace) {
                *cur++ = '\0';
                whitespace = 1;
            }
        } else if (*s == '\\' && !escaped) {
            escaped = 1;
        } else {
            if (whitespace) {
                /* we leave whitespace, and are not quoted. So it's a new argument */
                argv[x++] = cur;
                whitespace = 0;
            }
            *cur++ = *s;
            escaped = 0;
        }
    }
    /* Null terminate */
    *cur++ = '\0';
    /* XXX put a NULL in the last argument, because some functions that take
     * the array may want a null-terminated array.
     * argc still reflects the number of non-NULL entries.
     */
    argv[x] = NULL;
    *argc = x;
    *trailingwhitespace = whitespace;
    return duplicate;
}
 
char **ast_cli_completion_matches(const char *text, const char *word)
{
    struct ast_vector_string *vec = ast_cli_completion_vector(text, word);
    char **match_list;
 
    if (!vec) {
        return NULL;
    }
 
    if (AST_VECTOR_APPEND(vec, NULL)) {
        /* We failed to NULL terminate the elements */
        AST_VECTOR_CALLBACK_VOID(vec, ast_free);
        AST_VECTOR_PTR_FREE(vec);
 
        return NULL;
    }
 
    match_list = AST_VECTOR_STEAL_ELEMENTS(vec);
    AST_VECTOR_PTR_FREE(vec);
 
    return match_list;
}
 
AST_THREADSTORAGE_RAW(completion_storage);
 
/*!
 * \internal
 * \brief Add a value to the vector.
 *
 * \param vec Vector to add \a value to. Must be from threadstorage.
 * \param value The value to add.
 *
 * \retval 0 Success
 * \retval -1 Failure
 */
static int cli_completion_vector_add(struct ast_vector_string *vec, char *value)
{
    if (!value) {
        return 0;
    }
 
    if (!vec || AST_VECTOR_ADD_SORTED(vec, value, strcasecmp)) {
        if (vec) {
            ast_threadstorage_set_ptr(&completion_storage, NULL);
 
            AST_VECTOR_CALLBACK_VOID(vec, ast_free);
            AST_VECTOR_FREE(vec);
        }
        ast_free(value);
 
        return -1;
    }
 
    return 0;
}
 
int ast_cli_completion_add(char *value)
{
    return cli_completion_vector_add(ast_threadstorage_get_ptr(&completion_storage), value);
}
 
struct ast_vector_string *ast_cli_completion_vector(const char *text, const char *word)
{
    char *retstr, *prevstr;
    size_t max_equal;
    size_t which = 0;
    struct ast_vector_string *vec = ast_calloc(1, sizeof(*vec));
 
    /* Recursion into this function is a coding error. */
    ast_assert(!ast_threadstorage_get_ptr(&completion_storage));
 
    if (!vec) {
        return NULL;
    }
 
    if (ast_threadstorage_set_ptr(&completion_storage, vec)) {
        ast_log(LOG_ERROR, "Failed to initialize threadstorage for completion.\n");
        ast_free(vec);
 
        return NULL;
    }
 
    while ((retstr = ast_cli_generator(text, word, which)) != NULL) {
        if (cli_completion_vector_add(vec, retstr)) {
            ast_threadstorage_set_ptr(&completion_storage, NULL);
 
            goto vector_cleanup;
        }
 
        ++which;
    }
 
    ast_threadstorage_set_ptr(&completion_storage, NULL);
 
    if (!AST_VECTOR_SIZE(vec)) {
        AST_VECTOR_PTR_FREE(vec);
 
        return NULL;
    }
 
    prevstr = AST_VECTOR_GET(vec, 0);
    max_equal = strlen(prevstr);
    which = 1;
 
    /* Find the longest substring that is common to all results
     * (it is a candidate for completion), and store a copy in entry 0.
     */
    while (which < AST_VECTOR_SIZE(vec)) {
        size_t i = 0;
 
        retstr = AST_VECTOR_GET(vec, which);
        /* Check for and remove duplicate strings. */
        if (!strcasecmp(prevstr, retstr)) {
            AST_VECTOR_REMOVE(vec, which, 1);
            ast_free(retstr);
 
            continue;
        }
 
        while (i < max_equal && toupper(prevstr[i]) == toupper(retstr[i])) {
            i++;
        }
 
        max_equal = i;
        prevstr = retstr;
        ++which;
    }
 
    /* Insert longest match to position 0. */
    retstr = ast_strndup(AST_VECTOR_GET(vec, 0), max_equal);
    if (!retstr || AST_VECTOR_INSERT_AT(vec, 0, retstr)) {
        ast_free(retstr);
 
        goto vector_cleanup;
    }
 
    return vec;
 
vector_cleanup:
    AST_VECTOR_CALLBACK_VOID(vec, ast_free);
    AST_VECTOR_PTR_FREE(vec);
 
    return NULL;
}
 
/*! \brief returns true if there are more words to match */
static int more_words (const char * const *dst)
{
    int i;
    for (i = 0; dst[i]; i++) {
        if (dst[i][0] != '[')
            return -1;
    }
    return 0;
}
 
/*
 * generate the entry at position 'state'
 */
static char *__ast_cli_generator(const char *text, const char *word, int state, int lock)
{
    const char *argv[AST_MAX_ARGS];
    struct ast_cli_entry *e = NULL;
    int x = 0, argindex, matchlen;
    int matchnum=0;
    char *ret = NULL;
    char matchstr[80] = "";
    int tws = 0;
    /* Split the argument into an array of words */
    char *duplicate = parse_args(text, &x, argv, ARRAY_LEN(argv), &tws);
 
    if (!duplicate) /* malloc error */
        return NULL;
 
    /* Compute the index of the last argument (could be an empty string) */
    argindex = (!ast_strlen_zero(word) && x>0) ? x-1 : x;
 
    /* rebuild the command, ignore terminating white space and flatten space */
    ast_join(matchstr, sizeof(matchstr)-1, argv);
    matchlen = strlen(matchstr);
    if (tws) {
        strcat(matchstr, " "); /* XXX */
        if (matchlen)
            matchlen++;
    }
    if (lock)
        AST_RWLIST_RDLOCK(&helpers);
    while ( (e = cli_next(e)) ) {
        /* XXX repeated code */
        int src = 0, dst = 0, n = 0;
 
        if (e->command[0] == '_')
            continue;
 
        /*
         * Try to match words, up to and excluding the last word, which
         * is either a blank or something that we want to extend.
         */
        for (;src < argindex; dst++, src += n) {
            n = word_match(argv[src], e->cmda[dst]);
            if (n < 0)
                break;
        }
 
        if (src != argindex && more_words(e->cmda + dst))   /* not a match */
            continue;
        ret = is_prefix(argv[src], e->cmda[dst], state - matchnum, &n);
        matchnum += n;  /* this many matches here */
        if (ret) {
            /*
             * argv[src] is a valid prefix of the next word in this
             * command. If this is also the correct entry, return it.
             */
            if (matchnum > state)
                break;
            ast_free(ret);
            ret = NULL;
        } else if (ast_strlen_zero(e->cmda[dst])) {
            /*
             * This entry is a prefix of the command string entered
             * (only one entry in the list should have this property).
             * Run the generator if one is available. In any case we are done.
             */
            if (e->handler) {   /* new style command */
                struct ast_cli_args a = {
                    .line = matchstr, .word = word,
                    .pos = argindex,
                    .n = state - matchnum,
                    .argv = argv,
                    .argc = x};
 
                /* If the command is in a module it must be running. */
                if (!e->module || ast_module_running_ref(e->module)) {
                    ret = e->handler(e, CLI_GENERATE, &a);
                    ast_module_unref(e->module);
                }
            }
            if (ret)
                break;
        }
    }
    if (lock)
        AST_RWLIST_UNLOCK(&helpers);
    ast_free(duplicate);
    return ret;
}
 
char *ast_cli_generator(const char *text, const char *word, int state)
{
    return __ast_cli_generator(text, word, state, 1);
}
 
static int allowed_on_shutdown(struct ast_cli_entry *e)
{
    int found = 0;
    int i;
 
    ast_rwlock_rdlock(&shutdown_commands_lock);
    for (i = 0; i < AST_VECTOR_SIZE(&shutdown_commands); ++i) {
        if (e == AST_VECTOR_GET(&shutdown_commands, i)) {
            found = 1;
            break;
        }
    }
    ast_rwlock_unlock(&shutdown_commands_lock);
 
    return found;
}
 
int ast_cli_command_full(int uid, int gid, int fd, const char *s)
{
    const char *args[AST_MAX_ARGS + 1];
    struct ast_cli_entry *e = NULL;
    int x;
    char *duplicate = parse_args(s, &x, args + 1, AST_MAX_ARGS, NULL);
    char tmp[AST_MAX_ARGS + 1];
    char *retval = CLI_FAILURE;
    struct ast_cli_args a = {
        .fd = fd, .argc = x, .argv = args+1 };
 
    if (duplicate == NULL)
        return RESULT_FAILURE;
 
    if (x < 1)  /* We need at least one entry, otherwise ignore */
        goto done;
 
    AST_RWLIST_RDLOCK(&helpers);
    e = find_cli(args + 1, 0);
    if (e)
        ast_atomic_fetchadd_int(&e->inuse, 1);
    AST_RWLIST_UNLOCK(&helpers);
    if (e == NULL) {
        ast_cli(fd, "No such command '%s' (type 'core show help %s' for other possible commands)\n", s, find_best(args + 1));
        goto done;
    }
 
    if (ast_shutting_down() && !allowed_on_shutdown(e)) {
        ast_cli(fd, "Command '%s' cannot be run during shutdown\n", s);
        goto done;
    }
 
    ast_join(tmp, sizeof(tmp), args + 1);
    /* Check if the user has rights to run this command. */
    if (!cli_has_permissions(uid, gid, tmp)) {
        ast_cli(fd, "You don't have permissions to run '%s' command\n", tmp);
        goto done;
    }
 
    /*
     * Within the handler, argv[-1] contains a pointer to the ast_cli_entry.
     * Remember that the array returned by parse_args is NULL-terminated.
     */
    args[0] = (char *)e;
 
    /* If the command is in a module it must be running. */
    if (!e->module || ast_module_running_ref(e->module)) {
        retval = e->handler(e, CLI_HANDLER, &a);
        ast_module_unref(e->module);
    }
 
    if (retval == CLI_SHOWUSAGE) {
        ast_cli(fd, "%s", S_OR(e->usage, "Invalid usage, but no usage information available.\n"));
    } else if (retval == CLI_FAILURE) {
        ast_cli(fd, "Command '%s' failed.\n", s);
    }
 
done:
    if (e) {
        ast_atomic_fetchadd_int(&e->inuse, -1);
    }
    ast_free(duplicate);
    return retval == CLI_SUCCESS ? RESULT_SUCCESS : RESULT_FAILURE;
}
 
int ast_cli_command_multiple_full(int uid, int gid, int fd, size_t size, const char *s)
{
    char cmd[512];
    int x, y = 0, count = 0;
 
    for (x = 0; x < size; x++) {
        cmd[y] = s[x];
        y++;
        if (s[x] == '\0') {
            ast_cli_command_full(uid, gid, fd, cmd);
            y = 0;
            count++;
        }
    }
    return count;
}
 
void ast_cli_print_timestr_fromseconds(int fd, int seconds, const char *prefix)
{
    print_uptimestr(fd, ast_tv(seconds, 0), prefix, 0);
}
 
int ast_cli_allow_at_shutdown(struct ast_cli_entry *e)
{
    int res;
 
    ast_rwlock_wrlock(&shutdown_commands_lock);
    res = AST_VECTOR_APPEND(&shutdown_commands, e);
    ast_rwlock_unlock(&shutdown_commands_lock);
 
    return res;
}