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/* $Id$
 * $URL$
 *
 * plugin for ppp throughput
 *
 * Copyright (C) 2003 Michael Reinelt <michael@reinelt.co.at>
 * Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
 *
 * This file is part of LCD4Linux.
 *
 * LCD4Linux is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * LCD4Linux 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

/* 
 * exported functions:
 *
 * int plugin_init_ppp (void)
 *  adds ppp() function
 *
 */

#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/ioctl.h>

#ifdef HAVE_NET_IF_PPP_H
#include <net/if_ppp.h>
#else
#warning if_ppp.h not found. PPP support deactivated.
#endif

#include "debug.h"
#include "plugin.h"
#include "qprintf.h"
#include "hash.h"

#ifdef HAVE_NET_IF_PPP_H

static HASH PPP;

static int get_ppp_stats(void)
{
    int age;
    int unit;
    unsigned ibytes, obytes;
    static int fd = -2;
    struct ifpppstatsreq req;
    char key[16], val[16];

    /* reread every 10 msec only */
    age = hash_age(&PPP, NULL);
    if (age > 0 && age <= 10)
	return 0;

    /* open socket only once */
    if (fd == -2) {
	fd = socket(AF_INET, SOCK_DGRAM, 0);
	if (fd == -1) {
	    error("socket() failed: %s", strerror(errno));
	    return -1;
	}
    }

    for (unit = 0; unit < 8; unit++) {
	memset(&req, 0, sizeof(req));
	req.stats_ptr = (caddr_t) & req.stats;
	qprintf(req.ifr__name, sizeof(req.ifr__name), "ppp%d", unit);

	if (ioctl(fd, SIOCGPPPSTATS, &req) == 0) {
	    ibytes = req.stats.p.ppp_ibytes;
	    obytes = req.stats.p.ppp_obytes;
	} else {
	    ibytes = obytes = 0;
	}
	qprintf(key, sizeof(key), "Rx:%d", unit);
	qprintf(val, sizeof(val), "%d", ibytes);
	hash_put_delta(&PPP, key, val);
	qprintf(key, sizeof(key), "Tx:%d", unit);
	qprintf(val, sizeof(val), "%d", obytes);
	hash_put_delta(&PPP, key, val);

    }
    return 0;
}


static void my_ppp(RESULT * result, RESULT * arg1, RESULT * arg2)
{
    double value;

    if (get_ppp_stats() < 0) {
	SetResult(&result, R_STRING, "");
	return;
    }
    value = hash_get_delta(&PPP, R2S(arg1), NULL, R2N(arg2));
    SetResult(&result, R_NUMBER, &value);
}

#endif


int plugin_init_ppp(void)
{
    hash_create(&PPP);
#ifdef HAVE_NET_IF_PPP_H
    AddFunction("ppp", 2, my_ppp);
#endif
    return 0;
}

void plugin_exit_ppp(void)
{
    hash_destroy(&PPP);
}