cli.c

/*
 * 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 <editline/readline.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/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);

/*! list of module names and their debug levels */
static struct module_level_list debug_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_verbose_get_by_module(const char *module)
{
	return 0;
}

/*! \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 *complete_fn(const char *word, int state)
{
	char *c, *d;
	char filename[PATH_MAX];

	if (word[0] == '/')
		ast_copy_string(filename, word, sizeof(filename));
	else
		snprintf(filename, sizeof(filename), "%s/%s", ast_config_AST_MODULE_DIR, word);

	c = d = filename_completion_function(filename, state);

	if (c && word[0] != '/')
		c += (strlen(ast_config_AST_MODULE_DIR) + 1);
	if (c)
		c = ast_strdup(c);

	ast_std_free(d);

	return c;
}

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 complete_fn(a->word, a->n);
	}
	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, 1);
	}
	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[12];

	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;
}

static void status_debug_verbose(struct ast_cli_args *a, const char *what, int old_val, int cur_val)
{
	char was_buf[30];
	const char *was;

	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(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
	int oldval;
	int newlevel;
	int atleast = 0;
	const char *argv3 = a->argv ? S_OR(a->argv[3], "") : "";
	struct module_level *ml;

	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, "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, 0);
		}
		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 + 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(&debug_modules);

			ml = find_module_level(mod, &debug_modules);
			if (!newlevel) {
				if (!ml) {
					/* Specified off for a nonexistent entry. */
					AST_RWLIST_UNLOCK(&debug_modules);
					ast_cli(a->fd, "Core debug is still 0 for '%s'.\n", mod);
					return CLI_SUCCESS;
				}
				AST_RWLIST_REMOVE(&debug_modules, ml, entry);
				if (AST_RWLIST_EMPTY(&debug_modules)) {
					ast_clear_flag(&ast_options, AST_OPT_FLAG_DEBUG_MODULE);
				}
				AST_RWLIST_UNLOCK(&debug_modules);
				ast_cli(a->fd, "Core debug was %u and has been set to 0 for '%s'.\n",
					ml->level, mod);
				ast_free(ml);
				return CLI_SUCCESS;
			}

			if (ml) {
				if ((atleast && newlevel < ml->level) || ml->level == newlevel) {
					ast_cli(a->fd, "Core debug is still %u for '%s'.\n", ml->level, mod);
					AST_RWLIST_UNLOCK(&debug_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(&debug_modules);
					return CLI_FAILURE;
				}
				oldval = ml->level;
				ml->level = newlevel;
				strcpy(ml->module, mod);
				AST_RWLIST_INSERT_TAIL(&debug_modules, ml, entry);
			}
			ast_set_flag(&ast_options, AST_OPT_FLAG_DEBUG_MODULE);

			ast_cli(a->fd, "Core debug was %d and has been set to %u for '%s'.\n",
				oldval, ml->level, ml->module);

			AST_RWLIST_UNLOCK(&debug_modules);

			return CLI_SUCCESS;
		}
	}

	/* Update global debug level */
	if (!newlevel) {
		/* Specified level was 0 or off. */
		AST_RWLIST_WRLOCK(&debug_modules);
		while ((ml = AST_RWLIST_REMOVE_HEAD(&debug_modules, entry))) {
			ast_free(ml);
		}
		ast_clear_flag(&ast_options, AST_OPT_FLAG_DEBUG_MODULE);
		AST_RWLIST_UNLOCK(&debug_modules);
	}
	oldval = option_debug;
	if (!atleast || newlevel > option_debug) {
		option_debug = newlevel;
	}

	/* Report debug level status */
	status_debug_verbose(a, "Core debug", oldval, option_debug);

	return CLI_SUCCESS;
}

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, "Console verbose", 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_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, 0);
	}
	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, 0);
		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  "%-20.20s %-20.20s %-7.7s %-30.30s\n"
#define FORMAT_STRING2 "%-20.20s %-20.20s %-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  "%-20.20s %-20.20s %-16.16s %4d %-7.7s %-12.12s %-25.25s %-15.15s %8.8s %-11.11s %-11.11s %-20.20s\n"
#define VERBOSE_FORMAT_STRING2 "%-20.20s %-20.20s %-16.16s %-4.4s %-7.7s %-12.12s %-25.25s %-15.15s %8.8s %-11.11s %-11.11s %-20.20s\n"

	RAII_VAR(struct ao2_container *, channels, NULL, ao2_cleanup);
	struct ao2_iterator it_chans;
	struct stasis_message *msg;
	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"
			"	The 'concise' option is deprecated and will be removed from future versions\n"
			"	of Asterisk.\n";
		return NULL;