/*
 * minconn.c - pppd plugin to implement a `minconnect' option.
 *
 * Copyright (c) 1999-2024 Paul Mackerras. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <stddef.h>
#include <time.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdarg.h>
#include <sys/types.h>

#include <pppd/pppd.h>
#include <pppd/options.h>

#if !defined(SOL2)
#include <linux/ppp_defs.h>
#else
#include <net/ppp_defs.h>
#endif

char pppd_version[] = PPPD_VERSION;

static int minconnect = 0;

static struct option my_options[] = {
	{ "minconnect", o_int, &minconnect,
	  "Set minimum connect time before idle timeout applies" },
	{ NULL }
};

static int my_get_idle(struct ppp_idle *idle)
{
	time_t t;

	if (idle == NULL)
		return minconnect ? minconnect: ppp_get_max_idle_time();
	t = idle->xmit_idle;
	if (idle->recv_idle < t)
		t = idle->recv_idle;
	return ppp_get_max_idle_time() - t;
}

void plugin_init(void)
{
	info("plugin_init");
	ppp_add_options(my_options);
	idle_time_hook = my_get_idle;
}