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/*	$Id$	*/
/*
 * Copyright (c) 2004 demon <demon@vhost.dymdns.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, 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 <stdio.h>
#include <sys/socket.h>
#include <net/if.h>
#include <fcntl.h>
#include <kvm.h>
#include <nlist.h>
#include <limits.h>
#include <err.h>
#include "main.h"

kvm_t *kvmd = NULL;
void *ifhead;

int if_init(void) {
    char *vmunix = NULL, *core = NULL;
    char errbuf[_POSIX2_LINE_MAX];

    struct nlist nl[] = { { "_ifnet" }, { NULL } };

    kvmd = kvm_openfiles(vmunix, core, NULL, O_RDONLY, errbuf);
    if (kvmd == NULL)
	errx(1,"%s", errbuf);

    if ((kvm_nlist(kvmd, nl)) == -1)
	errx(1, "%s", kvm_geterr(kvmd));

    if (kvm_read(kvmd, nl->n_value, &ifhead, sizeof(nl->n_value)) != sizeof(nl->n_value))
	errx(1, "%s", kvm_geterr(kvmd));
}

int if_stat(char *ifname) {
    struct ifnet ifnet;
    void *addr;

    addr = ifhead;

    for (; addr != NULL; addr = (struct ifnet *)ifnet.if_list.tqe_next) {
	if (kvm_read(kvmd, (unsigned long)addr, &ifnet, sizeof(ifnet)) != sizeof(ifnet))
	    errx(1, "%s", kvm_geterr(kvmd));
	if (strncmp(ifnet.if_xname, ifname, strlen(ifname)) == NULL) {
	    curr.ib = ifnet.if_ibytes;
	    curr.ob = ifnet.if_obytes;
	}
    }
}

int if_fini(void) {
    kvm_close(kvmd);
    exit(0);
}