/* OpenBSC NAT interface to quagga VTY */
/* (C) 2010-2011 by Holger Hans Peter Freyther
 * (C) 2010-2011 by On-Waves
 * All Rights Reserved
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include <openbsc/vty.h>
#include <openbsc/gsm_data.h>
#include <openbsc/bsc_nat.h>
#include <openbsc/bsc_nat_sccp.h>
#include <openbsc/bsc_msc.h>
#include <openbsc/gsm_04_08.h>
#include <openbsc/mgcp.h>
#include <openbsc/vty.h>

#include <osmocom/core/talloc.h>
#include <osmocom/core/rate_ctr.h>
#include <osmocom/core/utils.h>
#include <osmocom/vty/logging.h>
#include <osmocom/vty/misc.h>

#include <osmocom/sccp/sccp.h>

#include <stdlib.h>

static struct bsc_nat *_nat;


#define PAGING_STR "Paging\n"
#define SMSC_REWRITE "SMSC Rewriting\n"

static struct cmd_node nat_node = {
	NAT_NODE,
	"%s(nat)#",
	1,
};

static struct cmd_node bsc_node = {
	NAT_BSC_NODE,
	"%s(bsc)#",
	1,
};

static struct cmd_node pgroup_node = {
	PGROUP_NODE,
	"%s(paging-group)#",
	1,
};

static int config_write_pgroup(struct vty *vty)
{
	return CMD_SUCCESS;
}

static void write_acc_lst(struct vty *vty, struct bsc_nat_acc_lst *lst)
{
	struct bsc_nat_acc_lst_entry *entry;

	llist_for_each_entry(entry, &lst->fltr_list, list) {
		if (entry->imsi_allow)
			vty_out(vty, " access-list %s imsi-allow %s%s",
				lst->name, entry->imsi_allow, VTY_NEWLINE);
		if (entry->imsi_deny)
			vty_out(vty, " access-list %s imsi-deny %s%s",
				lst->name, entry->imsi_deny, VTY_NEWLINE);
	}
}

static void dump_lac(struct vty *vty, struct llist_head *head)
{
	struct bsc_lac_entry *lac;
	llist_for_each_entry(lac, head, entry)
		vty_out(vty, "  location_area_code %u%s", lac->lac, VTY_NEWLINE);
}


static void write_pgroup_lst(struct vty *vty, struct bsc_nat_paging_group *pgroup)
{
	vty_out(vty, " paging-group %d%s", pgroup->nr, VTY_NEWLINE);
	dump_lac(vty, &pgroup->lists);
}

static int config_write_nat(struct vty *vty)
{
	struct bsc_nat_acc_lst *lst;
	struct bsc_nat_paging_group *pgroup;

	vty_out(vty, "nat%s", VTY_NEWLINE);
	vty_out(vty, " msc ip %s%s", _nat->main_dest->ip, VTY_NEWLINE);
	vty_out(vty, " msc port %d%s", _nat->main_dest->port, VTY_NEWLINE);
	vty_out(vty, " timeout auth %d%s", _nat->auth_timeout, VTY_NEWLINE);
	vty_out(vty, " timeout ping %d%s", _nat->ping_timeout, VTY_NEWLINE);
	vty_out(vty, " timeout pong %d%s", _nat->pong_timeout, VTY_NEWLINE);
	if (_nat->token)
		vty_out(vty, " token %s%s", _nat->token, VTY_NEWLINE);
	vty_out(vty, " ip-dscp %d%s", _nat->bsc_ip_dscp, VTY_NEWLINE);
	if (_nat->acc_lst_name)
		vty_out(vty, " access-list-name %s%s", _nat->acc_lst_name, VTY_NEWLINE);
	if (_nat->ussd_lst_name)
		vty_out(vty, " ussd-list-name %s%s", _nat->ussd_lst_name, VTY_NEWLINE);
	if (_nat->ussd_query)
		vty_out(vty, " ussd-query %s%s", _nat->ussd_query, VTY_NEWLINE);
	if (_nat->ussd_token)
		vty_out(vty, " ussd-token %s%s", _nat->ussd_token, VTY_NEWLINE);
	if (_nat->ussd_local)
		vty_out(vty, " ussd-local-ip %s%s", _nat->ussd_local, VTY_NEWLINE);

	if (_nat->num_rewr_name)
		vty_out(vty, " number-rewrite %s%s", _nat->num_rewr_name, VTY_NEWLINE);
	if (_nat->smsc_rewr_name)
		vty_out(vty, " rewrite-smsc addr %s%s",
			_nat->smsc_rewr_name, VTY_NEWLINE);
	if (_nat->tpdest_match_name)
		vty_out(vty, " rewrite-smsc tp-dest-match %s%s",
			_nat->tpdest_match_name, VTY_NEWLINE);
	if (_nat->sms_clear_tp_srr_name)
		vty_out(vty, " sms-clear-tp-srr %s%s",
			_nat->sms_clear_tp_srr_name, VTY_NEWLINE);

	llist_for_each_entry(lst, &_nat->access_lists, list)
		write_acc_lst(vty, lst);
	llist_for_each_entry(pgroup, &_nat->paging_groups, entry)
		write_pgroup_lst(vty, pgroup);

	return CMD_SUCCESS;
}

static void config_write_bsc_single(struct vty *vty, struct bsc_config *bsc)
{
	vty_out(vty, " bsc %u%s", bsc->nr, VTY_NEWLINE);
	vty_out(vty, "  token %s%s", bsc->token, VTY_NEWLINE);
	dump_lac(vty, &bsc->lac_list);
	if (bsc->description)
		vty_out(vty, "  description %s%s", bsc->description, VTY_NEWLINE);
	if (bsc->acc_lst_name)
		vty_out(vty, "  access-list-name %s%s", bsc->acc_lst_name, VTY_NEWLINE);
	vty_out(vty, "  max-endpoints %d%s", bsc->max_endpoints, VTY_NEWLINE);
	if (bsc->paging_group != -1)
		vty_out(vty, "  paging group %d%s", bsc->paging_group, VTY_NEWLINE);
	vty_out(vty, "  paging forbidden %d%s", bsc->forbid_paging, VTY_NEWLINE);
}

static int config_write_bsc(struct vty *vty)
{
	struct bsc_config *bsc;

	llist_for_each_entry(bsc, &_nat->bsc_configs, entry)
		config_write_bsc_single(vty, bsc);
	return CMD_SUCCESS;
}


DEFUN(show_sccp, show_sccp_cmd, "show sccp connections",
      SHOW_STR "Display information about current SCCP connections")
{
	struct sccp_connections *con;
	vty_out(vty, "Listing all open SCCP connections%s", VTY_NEWLINE);

	llist_for_each_entry(con, &_nat->sccp_connections, list_entry) {
		vty_out(vty, "For BSC Nr: %d BSC ref: 0x%x; MUX ref: 0x%x; Network has ref: %d ref: 0x%x MSC/BSC mux: 0x%x/0x%x type: %s%s",
			con->bsc->cfg ? con->bsc->cfg->nr : -1,
			sccp_src_ref_to_int(&con->real_ref),
			sccp_src_ref_to_int(&con->patched_ref),
			con->has_remote_ref,
			sccp_src_ref_to_int(&con->remote_ref),
			con->msc_endp, con->bsc_endp,
			bsc_con_type_to_string(con->con_type),
			VTY_NEWLINE);
	}

	return CMD_SUCCESS;
}

DEFUN(show_bsc, show_bsc_cmd, "show bsc connections",
      SHOW_STR "Display information about current BSCs")
{
	struct bsc_connection *con;
	struct sockaddr_in sock;
	socklen_t len = sizeof(sock);

	llist_for_each_entry(con, &_nat->bsc_connections, list_entry) {
		getpeername(con->write_queue.bfd.fd, (struct sockaddr *) &sock, &len);
		vty_out(vty, "BSC nr: %d auth: %d fd: %d peername: %s%s",
			con->cfg ? con->cfg->nr : -1,
			con->authenticated, con->write_queue.bfd.fd,
			inet_ntoa(sock.sin_addr), VTY_NEWLINE);
	}

	return CMD_SUCCESS;
}

DEFUN(show_bsc_mgcp, show_bsc_mgcp_cmd, "show bsc mgcp NR",
      SHOW_STR "Display the MGCP status for a given BSC")
{
	struct bsc_connection *con;
	int nr = atoi(argv[0]);
	int i, j, endp;

	llist_for_each_entry(con, &_nat->bsc_connections, list_entry) {
		int max;
		if (!con->cfg)
			continue;
		if (con->cfg->nr != nr)
			continue;

		/* this bsc has no audio endpoints yet */
		if (!con->_endpoint_status)
			continue;

		vty_out(vty, "MGCP Status for %d%s", con->cfg->nr, VTY_NEWLINE);
		max = bsc_mgcp_nr_multiplexes(con->max_endpoints);
		for (i = 0; i < max; ++i) {
			for (j = 0; j < 32; ++j) {
				endp = mgcp_timeslot_to_endpoint(i, j);
				vty_out(vty, " Endpoint 0x%x %s%s", endp,
					con->_endpoint_status[endp] == 0 
						? "free" : "allocated",
				VTY_NEWLINE);
			}
		}
		break;
	}

	return CMD_SUCCESS;
}

DEFUN(show_bsc_cfg, show_bsc_cfg_cmd, "show bsc config",
      SHOW_STR "Display information about known BSC configs")
{
	struct bsc_config *conf;
	llist_for_each_entry(conf, &_nat->bsc_configs, entry) {
		vty_out(vty, "BSC token: '%s' nr: %u%s",
			conf->token, conf->nr, VTY_NEWLINE);
		if (conf->acc_lst_name)
			vty_out(vty, " access-list: %s%s",
				conf->acc_lst_name, VTY_NEWLINE);
		vty_out(vty, " paging forbidden: %d%s",
			conf->forbid_paging, VTY_NEWLINE);
		if (conf->description)
			vty_out(vty, " description: %s%s", conf->description, VTY_NEWLINE);
		else
			vty_out(vty, " No description.%s", VTY_NEWLINE);

	}

	return CMD_SUCCESS;
}

static void dump_stat_total(struct vty *vty, struct bsc_nat *nat)
{
	vty_out(vty, "NAT statistics%s", VTY_NEWLINE);
	vty_out(vty, " SCCP Connections %lu total, %lu calls%s",
		osmo_counter_get(nat->stats.sccp.conn),
		osmo_counter_get(nat->stats.sccp.calls), VTY_NEWLINE);
	vty_out(vty, " MSC Connections %lu%s",
		osmo_counter_get(nat->stats.msc.reconn), VTY_NEWLINE);
	vty_out(vty, " MSC Connected: %d%s",
		nat->msc_con->is_connected, VTY_NEWLINE);
	vty_out(vty, " BSC Connections %lu total, %lu auth failed.%s",
		osmo_counter_get(nat->stats.bsc.reconn),
		osmo_counter_get(nat->stats.bsc.auth_fail), VTY_NEWLINE);
}

static void dump_stat_bsc(struct vty *vty, struct bsc_config *conf)
{
	int connected = 0;
	struct bsc_connection *con;

	vty_out(vty, " BSC nr: %d%s",
		conf->nr, VTY_NEWLINE);
	vty_out_rate_ctr_group(vty, " ", conf->stats.ctrg);

	llist_for_each_entry(con, &conf->nat->bsc_connections, list_entry) {
		if (con->cfg != conf)
			continue;
		connected = 1;
		break;
	}

	vty_out(vty, "  Connected: %d%s", connected, VTY_NEWLINE);
}

DEFUN(show_stats,
      show_stats_cmd,
      "show statistics [NR]",
	SHOW_STR "Display network statistics")
{
	struct bsc_config *conf;

	int nr = -1;

	if (argc == 1)
		nr = atoi(argv[0]);

	dump_stat_total(vty, _nat);
	llist_for_each_entry(conf, &_nat->bsc_configs, entry) {
		if (argc == 1 && nr != conf->nr)
			continue;
		dump_stat_bsc(vty, conf);
	}

	return CMD_SUCCESS;
}

DEFUN(show_stats_lac,
      show_stats_lac_cmd,
      "show statistics-by-lac <0-65535>",
      SHOW_STR "Display network statistics by lac\n"
      "The lac of the BSC\n")
{
	int lac;
	struct bsc_config *conf;

	lac = atoi(argv[0]);

	dump_stat_total(vty, _nat);
	llist_for_each_entry(conf, &_nat->bsc_configs, entry) {
		if (!bsc_config_handles_lac(conf, lac))
			continue;
		dump_stat_bsc(vty, conf);
	}

	return CMD_SUCCESS;
}

DEFUN(show_msc,
      show_msc_cmd,
      "show msc connection",
      SHOW_STR "Show the status of the MSC connection.")
{
	if (!_nat->msc_con) {
		vty_out(vty, "The MSC is not yet configured.\n");
		return CMD_WARNING;
	}

	vty_out(vty, "MSC is connected: %d%s\n",
		_nat->msc_con->is_connected, VTY_NEWLINE);
	return CMD_SUCCESS;
}

DEFUN(close_bsc,
      close_bsc_cmd,
      "close bsc connection BSC_NR",
      "Close the connection with the BSC identified by the config number.")
{
	struct bsc_connection *bsc;
	int bsc_nr = atoi(argv[0]);

	llist_for_each_entry(bsc, &_nat->bsc_connections, list_entry) {
		if (!bsc->cfg || bsc->cfg->nr != bsc_nr)
			continue;
		bsc_close_connection(bsc);
		break;
	}

	return CMD_SUCCESS;
}

DEFUN(cfg_nat, cfg_nat_cmd, "nat", "Configute the NAT")
{
	vty->index = _nat;
	vty->node = NAT_NODE;

	return CMD_SUCCESS;
}

DEFUN(cfg_nat_msc_ip,
      cfg_nat_msc_ip_cmd,
      "msc ip A.B.C.D",
      "Set the IP address of the MSC.")
{
	bsc_nat_set_msc_ip(_nat, argv[0]);
	return CMD_SUCCESS;
}

DEFUN(cfg_nat_msc_port,
      cfg_nat_msc_port_cmd,
      "msc port <1-65500>",
      "Set the port of the MSC.")
{
	_nat->main_dest->port = atoi(argv[0]);
	return CMD_SUCCESS;
}

DEFUN(cfg_nat_auth_time,
      cfg_nat_auth_time_cmd,
      "timeout auth <1-256>",
      "The time to wait for an auth response.")
{
	_nat->auth_timeout = atoi(argv[0]);
	return CMD_SUCCESS;
}

DEFUN(cfg_nat_ping_time,
      cfg_nat_ping_time_cmd,
      "timeout ping NR",
      "Send a ping every NR seconds. Negative to disable.")
{
	_nat->ping_timeout = atoi(argv[0]);
	return CMD_SUCCESS;
}

DEFUN(cfg_nat_pong_time,
      cfg_nat_pong_time_cmd,
      "timeout pong NR",
      "Wait NR seconds for the PONG response. Should be smaller than ping.")
{
	_nat->pong_timeout = atoi(argv[0]);
	return CMD_SUCCESS;
}

DEFUN(cfg_nat_token, cfg_nat_token_cmd,
      "token TOKEN",
      "Set a token for the NAT")
{
	bsc_replace_string(_nat, &_nat->token, argv[0]);
	return CMD_SUCCESS;
}

DEFUN(cfg_nat_bsc_ip_dscp, cfg_nat_bsc_ip_dscp_cmd,
      "ip-dscp <0-255>",
      "Set the IP DSCP for the BSCs to use\n" "Set the IP_TOS attribute")
{
	_nat->bsc_ip_dscp = atoi(argv[0]);
	return CMD_SUCCESS;
}

ALIAS_DEPRECATED(cfg_nat_bsc_ip_dscp, cfg_nat_bsc_ip_tos_cmd,
      "ip-tos <0-255>",
      "Use ip-dscp in the future.\n" "Set the DSCP\n")


DEFUN(cfg_nat_acc_lst_name,
      cfg_nat_acc_lst_name_cmd,
      "access-list-name NAME",
      "Set the name of the access list to use.\n"
      "The name of the to be used access list.")
{
	bsc_replace_string(_nat, &_nat->acc_lst_name, argv[0]);
	return CMD_SUCCESS;
}

DEFUN(cfg_nat_no_acc_lst_name,
      cfg_nat_no_acc_lst_name_cmd,
      "no access-list-name",
      NO_STR "Remove the access list from the NAT.\n")
{
	if (_nat->acc_lst_name) {
		talloc_free(_nat->acc_lst_name);
		_nat->acc_lst_name = NULL;
	}

	return CMD_SUCCESS;
}

static int replace_rules(struct bsc_nat *nat, char **name,
			 struct llist_head *head, const char *file)
{
	struct osmo_config_list *rewr = NULL;

	bsc_replace_string(nat, name, file);
	if (*name) {
		rewr = osmo_config_list_parse(nat, *name);
		bsc_nat_num_rewr_entry_adapt(nat, head, rewr);
		talloc_free(rewr);
		return CMD_SUCCESS;
	} else {
		bsc_nat_num_rewr_entry_adapt(nat, head, NULL);
		return CMD_SUCCESS;
	}
}

DEFUN(cfg_nat_number_rewrite,
      cfg_nat_number_rewrite_cmd,
      "number-rewrite FILENAME",
      "Set the file with rewriting rules.\n" "Filename")
{
	return replace_rules(_nat, &_nat->num_rewr_name,
			     &_nat->num_rewr, argv[0]);
}

DEFUN(cfg_nat_smsc_addr,
      cfg_nat_smsc_addr_cmd,
      "rewrite-smsc addr FILENAME",
      SMSC_REWRITE
      "The SMSC Address to match and replace in RP-DATA\n"
      "File with rules for the SMSC Address replacing\n")
{
	return replace_rules(_nat, &_nat->smsc_rewr_name,
			     &_nat->smsc_rewr, argv[0]);
}

DEFUN(cfg_nat_smsc_tpdest,
      cfg_nat_smsc_tpdest_cmd,
      "rewrite-smsc tp-dest-match FILENAME",
      SMSC_REWRITE
      "Match TP-Destination of a SMS.\n"
      "File with rules for matching MSISDN and TP-DEST\n")
{
	return replace_rules(_nat, &_nat->tpdest_match_name,
			     &_nat->tpdest_match, argv[0]);
}

DEFUN(cfg_nat_sms_clear_tpsrr,
      cfg_nat_sms_clear_tpsrr_cmd,
      "sms-clear-tp-srr FILENAME",
      "SMS TPDU Sender Report Request clearing\n"
      "Files with rules for matching MSISDN\n")
{
	return replace_rules(_nat, &_nat->sms_clear_tp_srr_name,
			     &_nat->sms_clear_tp_srr, argv[0]);
}

DEFUN(cfg_nat_no_sms_clear_tpsrr,
      cfg_nat_no_sms_clear_tpsrr_cmd,
      "no sms-clear-tp-srr",
      NO_STR
      "SMS TPDU Sender Report Request clearing\n")
{
	talloc_free(_nat->sms_clear_tp_srr_name);
	_nat->sms_clear_tp_srr_name = NULL;

	bsc_nat_num_rewr_entry_adapt(NULL, &_nat->sms_clear_tp_srr, NULL);
	return CMD_SUCCESS;
}

DEFUN(cfg_nat_ussd_lst_name,
      cfg_nat_ussd_lst_name_cmd,
      "ussd-list-name NAME",
      "Set the name of the access list to check for IMSIs for USSD message\n"
      "The name of the access list for HLR USSD handling")
{
	bsc_replace_string(_nat, &_nat->ussd_lst_name, argv[0]);
	return CMD_SUCCESS;
}

DEFUN(cfg_nat_ussd_query,
      cfg_nat_ussd_query_cmd,
      "ussd-query REGEXP",
      "Set the USSD query to match with the ussd-list-name\n"
      "The query to match")
{
	if (gsm_parse_reg(_nat, &_nat->ussd_query_re, &_nat->ussd_query, argc, argv) != 0)
		return CMD_WARNING;
	return CMD_SUCCESS;
}

DEFUN(cfg_nat_ussd_token,
      cfg_nat_ussd_token_cmd,
      "ussd-token TOKEN",
      "Set the token used to identify the USSD module\n" "Secret key\n")
{
	bsc_replace_string(_nat, &_nat->ussd_token, argv[0]);
	return CMD_SUCCESS;
}

DEFUN(cfg_nat_ussd_local,
      cfg_nat_ussd_local_cmd,
      "ussd-local-ip A.B.C.D",
      "Set the IP to listen for the USSD Provider\n" "IP Address\n")
{
	bsc_replace_string(_nat, &_nat->ussd_local, argv[0]);
	return CMD_SUCCESS;
}

/* per BSC configuration */
DEFUN(cfg_bsc, cfg_bsc_cmd, "bsc BSC_NR", "Select a BSC to configure")
{
	int bsc_nr = atoi(argv[0]);
	struct bsc_config *bsc;

	if (bsc_nr > _nat->num_bsc) {
		vty_out(vty, "%% The next unused BSC number is %u%s",
			_nat->num_bsc, VTY_NEWLINE);
		return CMD_WARNING;
	} else if (bsc_nr == _nat->num_bsc) {
		/* allocate a new one */
		bsc = bsc_config_alloc(_nat, "unknown");
	} else
		bsc = bsc_config_num(_nat, bsc_nr);

	if (!bsc)
		return CMD_WARNING;

	vty->index = bsc;
	vty->node = NAT_BSC_NODE;

	return CMD_SUCCESS;
}

DEFUN(cfg_bsc_token, cfg_bsc_token_cmd, "token TOKEN", "Set the token")
{
	struct bsc_config *conf = vty->index;

	bsc_replace_string(conf, &conf->token, argv[0]);
	return CMD_SUCCESS;
}

DEFUN(cfg_bsc_lac, cfg_bsc_lac_cmd, "location_area_code <0-65535>",
      "Add the Location Area Code (LAC) of this BSC\n" "LAC\n")
{
	struct bsc_config *tmp;
	struct bsc_config *conf = vty->index;

	int lac = atoi(argv[0]);

	if (lac == GSM_LAC_RESERVED_DETACHED || lac == GSM_LAC_RESERVED_ALL_BTS) {
		vty_out(vty, "%% LAC %d is reserved by GSM 04.08%s",
			lac, VTY_NEWLINE);
		return CMD_WARNING;
	}

	/* verify that the LACs are unique */
	llist_for_each_entry(tmp, &_nat->bsc_configs, entry) {
		if (bsc_config_handles_lac(tmp, lac)) {
			vty_out(vty, "%% LAC %d is already used.%s", lac, VTY_NEWLINE);
			return CMD_ERR_INCOMPLETE;
		}
	}

	bsc_config_add_lac(conf, lac);

	return CMD_SUCCESS;
}

DEFUN(cfg_bsc_no_lac, cfg_bsc_no_lac_cmd,
      "no location_area_code <0-65535>",
      NO_STR "Remove the Location Area Code (LAC) of this BSC\n" "LAC\n")
{
	int lac = atoi(argv[0]);
	struct bsc_config *conf = vty->index;

	bsc_config_del_lac(conf, lac);
	return CMD_SUCCESS;
}


DEFUN(cfg_lst_imsi_allow,
      cfg_lst_imsi_allow_cmd,
      "access-list NAME imsi-allow [REGEXP]",
      "Add the regexp to the allowed list\n"
      "The name of the access-list\n"
      "The regexp of allowed IMSIs\n")
{
	struct bsc_nat_acc_lst *acc;
	struct bsc_nat_acc_lst_entry *entry;

	acc = bsc_nat_acc_lst_get(_nat, argv[0]);
	if (!acc)
		return CMD_WARNING;

	entry = bsc_nat_acc_lst_entry_create(acc);
	if (!entry)
		return CMD_WARNING;

	if (gsm_parse_reg(acc, &entry->imsi_allow_re, &entry->imsi_allow, argc - 1, &argv[1]) != 0)
		return CMD_WARNING;
	return CMD_SUCCESS;
}

DEFUN(cfg_lst_imsi_deny,
      cfg_lst_imsi_deny_cmd,
      "access-list NAME imsi-deny [REGEXP]",
      "Add the regexp to the deny list\n"
      "The name of the access-list\n"
      "The regexp of to be denied IMSIs\n")
{
	struct bsc_nat_acc_lst *acc;
	struct bsc_nat_acc_lst_entry *entry;

	acc = bsc_nat_acc_lst_get(_nat, argv[0]);
	if (!acc)
		return CMD_WARNING;

	entry = bsc_nat_acc_lst_entry_create(acc);
	if (!entry)
		return CMD_WARNING;

	if (gsm_parse_reg(acc, &entry->imsi_deny_re, &entry->imsi_deny, argc - 1, &argv[1]) != 0)
		return CMD_WARNING;
	return CMD_SUCCESS;
}

/* naming to follow Zebra... */
DEFUN(cfg_lst_no,
      cfg_lst_no_cmd,
      "no access-list NAME",
      NO_STR "Remove an access-list by name\n"
      "The access-list to remove\n")
{
	struct bsc_nat_acc_lst *acc;
	acc = bsc_nat_acc_lst_find(_nat, argv[0]);
	if (!acc)
		return CMD_WARNING;

	bsc_nat_acc_lst_delete(acc);
	return CMD_SUCCESS;
}

DEFUN(show_acc_lst,
      show_acc_lst_cmd,
      "show access-list NAME",
      SHOW_STR "The name of the access list\n")
{
	struct bsc_nat_acc_lst *acc;
	acc = bsc_nat_acc_lst_find(_nat, argv[0]);
	if (!acc)
		return CMD_WARNING;

	vty_out(vty, "access-list %s%s", acc->name, VTY_NEWLINE);
	vty_out_rate_ctr_group(vty, " ", acc->stats);

	return CMD_SUCCESS;
}


DEFUN(cfg_bsc_acc_lst_name,
      cfg_bsc_acc_lst_name_cmd,
      "access-list-name NAME",
      "Set the name of the access list to use.\n"
      "The name of the to be used access list.")
{
	struct bsc_config *conf = vty->index;

	bsc_replace_string(conf, &conf->acc_lst_name, argv[0]);
	return CMD_SUCCESS;
}

DEFUN(cfg_bsc_no_acc_lst_name,
      cfg_bsc_no_acc_lst_name_cmd,
      "no access-list-name",
      NO_STR "Do not use an access-list for the BSC.\n")
{
	struct bsc_config *conf = vty->index;

	if (conf->acc_lst_name) {
		talloc_free(conf->acc_lst_name);
		conf->acc_lst_name = NULL;
	}

	return CMD_SUCCESS;
}

DEFUN(cfg_bsc_max_endps, cfg_bsc_max_endps_cmd,
      "max-endpoints <1-1024>",
      "Highest endpoint to use (exclusively)\n" "Number of ports\n")
{
	struct bsc_config *conf = vty->index;

	conf->max_endpoints = atoi(argv[0]);
	return CMD_SUCCESS;
}

DEFUN(cfg_bsc_paging,
      cfg_bsc_paging_cmd,
      "paging forbidden (0|1)",
      PAGING_STR "Forbid sending PAGING REQUESTS to the BSC.")
{
	struct bsc_config *conf = vty->index;

	if (strcmp("1", argv[0]) == 0)
		conf->forbid_paging = 1;
	else
		conf->forbid_paging = 0;

	return CMD_SUCCESS;
}

DEFUN(cfg_bsc_desc,
      cfg_bsc_desc_cmd,
      "description DESC",
      "Provide a description for the given BSC.")
{
	struct bsc_config *conf = vty->index;

	bsc_replace_string(conf, &conf->description, argv[0]);
	return CMD_SUCCESS;
}

DEFUN(cfg_bsc_paging_grp,
      cfg_bsc_paging_grp_cmd,
      "paging group <0-1000>",
      PAGING_STR "Use a paging group\n" "Paging Group to use\n")
{
	struct bsc_config *conf = vty->index;
	conf->paging_group = atoi(argv[0]);
	return CMD_SUCCESS;
}

ALIAS_DEPRECATED(cfg_bsc_paging_grp, cfg_bsc_old_grp_cmd,
		 "paging-group <0-1000>",
		 "Use a paging group\n" "Paging Group to use\n")

DEFUN(cfg_bsc_no_paging_grp,
      cfg_bsc_no_paging_grp_cmd,
      "no paging group",
      NO_STR PAGING_STR "Disable the usage of a paging group.\n")
{
	struct bsc_config *conf = vty->index;
	conf->paging_group = PAGIN_GROUP_UNASSIGNED;
	return CMD_SUCCESS;
}

DEFUN(test_regex, test_regex_cmd,
      "test regex PATTERN STRING",
      "Check if the string is matching the current pattern.")
{
	regex_t reg;
	char *str = NULL;

	memset(&reg, 0, sizeof(reg));
	if (gsm_parse_reg(_nat, &reg, &str, 1, argv) != 0)
		return CMD_WARNING;

	vty_out(vty, "String matches allow pattern: %d%s",
		regexec(&reg, argv[1], 0, NULL, 0) == 0, VTY_NEWLINE);

	talloc_free(str);
	regfree(&reg);
	return CMD_SUCCESS;
}

DEFUN(set_last_endp, set_last_endp_cmd,
      "set bsc last-used-endpoint <0-9999999999> <0-1024>",
      "Set a value\n" "Operate on a BSC\n"
      "Last used endpoint for an assignment\n" "BSC configuration number\n"
      "Endpoint number used\n")
{
	struct bsc_connection *con;
	int nr = atoi(argv[0]);
	int endp = atoi(argv[1]);


	llist_for_each_entry(con, &_nat->bsc_connections, list_entry) {
		if (!con->cfg)
			continue;
		if (con->cfg->nr != nr)
			continue;

		con->last_endpoint = endp;
		vty_out(vty, "Updated the last endpoint for %d to %d.%s",
			con->cfg->nr, con->last_endpoint, VTY_NEWLINE);
	}

	return CMD_SUCCESS;
}

DEFUN(block_new_conn, block_new_conn_cmd,
      "nat-block (block|unblock)",
      "Block the NAT for new connections\n"
      "Block\n" "Unblock\n")
{
	_nat->blocked = argv[0][0] == 'b';
	vty_out(vty, "%%Going to %s the NAT.%s",
		_nat->blocked ? "block" : "unblock", VTY_NEWLINE);
	return CMD_SUCCESS;
}

/* paging group */
DEFUN(cfg_nat_pgroup, cfg_nat_pgroup_cmd,
      "paging-group <0-1000>",
      "Create a Paging Group\n" "Number of the Group\n")
{
	int group = atoi(argv[0]);
	struct bsc_nat_paging_group *pgroup;
	pgroup = bsc_nat_paging_group_num(_nat, group);
	if (!pgroup)
		pgroup = bsc_nat_paging_group_create(_nat, group);
	if (!pgroup) {
		vty_out(vty, "Failed to create the group.%s", VTY_NEWLINE);
		return CMD_WARNING;
	}

	vty->index = pgroup;
	vty->node = PGROUP_NODE;
	return CMD_SUCCESS;
}

DEFUN(cfg_nat_no_pgroup, cfg_nat_no_pgroup_cmd,
      "no paging-group <0-1000>",
      NO_STR "Delete paging-group\n")
{
	int group = atoi(argv[0]);
	struct bsc_nat_paging_group *pgroup;
	pgroup = bsc_nat_paging_group_num(_nat, group);
	if (!pgroup) {
		vty_out(vty, "No such paging group %d.%s", group, VTY_NEWLINE);
		return CMD_WARNING;
	}

	bsc_nat_paging_group_delete(pgroup);
	return CMD_SUCCESS;
}

DEFUN(cfg_pgroup_lac, cfg_pgroup_lac_cmd,
      "location_area_code <0-65535>",
       "Add the Location Area Code (LAC)\n" "LAC\n")
{
	struct bsc_nat_paging_group *pgroup = vty->index;

	int lac = atoi(argv[0]);
	if (lac == GSM_LAC_RESERVED_DETACHED || lac == GSM_LAC_RESERVED_ALL_BTS) {
		vty_out(vty, "%% LAC %d is reserved by GSM 04.08%s",
			lac, VTY_NEWLINE);
		return CMD_WARNING;
	}

	bsc_nat_paging_group_add_lac(pgroup, lac);
	return CMD_SUCCESS;
}

DEFUN(cfg_pgroup_no_lac, cfg_pgroup_no_lac_cmd,
      "no location_area_code <0-65535>",
      NO_STR "Remove the Location Area Code (LAC)\n" "LAC\n")
{
	int lac = atoi(argv[0]);
	struct bsc_nat_paging_group *pgroup = vty->index;

	bsc_nat_paging_group_del_lac(pgroup, lac);
	return CMD_SUCCESS;
}

int bsc_nat_vty_init(struct bsc_nat *nat)
{
	_nat = nat;

	/* show commands */
	install_element_ve(&show_sccp_cmd);
	install_element_ve(&show_bsc_cmd);
	install_element_ve(&show_bsc_cfg_cmd);
	install_element_ve(&show_stats_cmd);
	install_element_ve(&show_stats_lac_cmd);
	install_element_ve(&close_bsc_cmd);
	install_element_ve(&show_msc_cmd);
	install_element_ve(&test_regex_cmd);
	install_element_ve(&show_bsc_mgcp_cmd);
	install_element_ve(&show_acc_lst_cmd);

	install_element(ENABLE_NODE, &set_last_endp_cmd);
	install_element(ENABLE_NODE, &block_new_conn_cmd);

	/* nat group */
	install_element(CONFIG_NODE, &cfg_nat_cmd);
	install_node(&nat_node, config_write_nat);
	install_default(NAT_NODE);
	install_element(NAT_NODE, &ournode_exit_cmd);
	install_element(NAT_NODE, &ournode_end_cmd);
	install_element(NAT_NODE, &cfg_nat_msc_ip_cmd);
	install_element(NAT_NODE, &cfg_nat_msc_port_cmd);
	install_element(NAT_NODE, &cfg_nat_auth_time_cmd);
	install_element(NAT_NODE, &cfg_nat_ping_time_cmd);
	install_element(NAT_NODE, &cfg_nat_pong_time_cmd);
	install_element(NAT_NODE, &cfg_nat_token_cmd);
	install_element(NAT_NODE, &cfg_nat_bsc_ip_dscp_cmd);
	install_element(NAT_NODE, &cfg_nat_bsc_ip_tos_cmd);
	install_element(NAT_NODE, &cfg_nat_acc_lst_name_cmd);
	install_element(NAT_NODE, &cfg_nat_no_acc_lst_name_cmd);
	install_element(NAT_NODE, &cfg_nat_ussd_lst_name_cmd);
	install_element(NAT_NODE, &cfg_nat_ussd_query_cmd);
	install_element(NAT_NODE, &cfg_nat_ussd_token_cmd);
	install_element(NAT_NODE, &cfg_nat_ussd_local_cmd);

	/* access-list */
	install_element(NAT_NODE, &cfg_lst_imsi_allow_cmd);
	install_element(NAT_NODE, &cfg_lst_imsi_deny_cmd);
	install_element(NAT_NODE, &cfg_lst_no_cmd);

	/* number rewriting */
	install_element(NAT_NODE, &cfg_nat_number_rewrite_cmd);
	install_element(NAT_NODE, &cfg_nat_smsc_addr_cmd);
	install_element(NAT_NODE, &cfg_nat_smsc_tpdest_cmd);
	install_element(NAT_NODE, &cfg_nat_sms_clear_tpsrr_cmd);
	install_element(NAT_NODE, &cfg_nat_no_sms_clear_tpsrr_cmd);

	install_element(NAT_NODE, &cfg_nat_pgroup_cmd);
	install_element(NAT_NODE, &cfg_nat_no_pgroup_cmd);
	install_node(&pgroup_node, config_write_pgroup);
	install_default(PGROUP_NODE);
	install_element(PGROUP_NODE, &cfg_pgroup_lac_cmd);
	install_element(PGROUP_NODE, &cfg_pgroup_no_lac_cmd);

	/* BSC subgroups */
	install_element(NAT_NODE, &cfg_bsc_cmd);
	install_node(&bsc_node, config_write_bsc);
	install_default(NAT_BSC_NODE);
	install_element(NAT_BSC_NODE, &ournode_exit_cmd);
	install_element(NAT_BSC_NODE, &ournode_end_cmd);
	install_element(NAT_BSC_NODE, &cfg_bsc_token_cmd);
	install_element(NAT_BSC_NODE, &cfg_bsc_lac_cmd);
	install_element(NAT_BSC_NODE, &cfg_bsc_no_lac_cmd);
	install_element(NAT_BSC_NODE, &cfg_bsc_paging_cmd);
	install_element(NAT_BSC_NODE, &cfg_bsc_desc_cmd);
	install_element(NAT_BSC_NODE, &cfg_bsc_acc_lst_name_cmd);
	install_element(NAT_BSC_NODE, &cfg_bsc_no_acc_lst_name_cmd);
	install_element(NAT_BSC_NODE, &cfg_bsc_max_endps_cmd);
	install_element(NAT_BSC_NODE, &cfg_bsc_old_grp_cmd);
	install_element(NAT_BSC_NODE, &cfg_bsc_paging_grp_cmd);
	install_element(NAT_BSC_NODE, &cfg_bsc_no_paging_grp_cmd);

	mgcp_vty_init();

	return 0;
}


/* called by the telnet interface... we have our own init above */
int bsc_vty_init(const struct log_info *cat)
{
	logging_vty_add_cmds(cat);
	return 0;
}