minconn.c

实现点到点的以太网协议,用于拨号上网,是拨号上网的基础部分软件模块.

/*
 * minconn.c - pppd plugin to implement a `minconnect' option.
 *
 * Copyright (c) 1999 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.
 *
 * 3. The name(s) of the authors of this software must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission.
 *
 * 4. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by Paul Mackerras
 *     <[e-mail]>".
 *
 * 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 "pppd.h"

char pppd_version[] = VERSION;

static int minconnect = 0;

static option_t 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: idle_time_limit;
	t = idle->xmit_idle;
	if (idle->recv_idle < t)
		t = idle->recv_idle;
	return idle_time_limit - t;
}

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