/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <stdlib.h>
#include <stdio.h>
#include <strings.h>
#include <stropts.h>
#include <unistd.h>
#include <uuid/uuid.h>
#include <sys/sockio.h>
#include <libdlpi.h>
#include <sys/utsname.h>

#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include "etheraddr.h"

static boolean_t get_etheraddr(const char *linkname, void *arg);

/*
 * get an individual arp entry
 */
int
arp_get(uuid_node_t *node)
{
        struct utsname name;
        struct arpreq ar;
        struct hostent *hp;
        struct sockaddr_in *sin;
        int s;

        if (uname(&name) == -1) {
                return (-1);
        }
        (void) memset(&ar, 0, sizeof (ar));
        ar.arp_pa.sa_family = AF_INET;
        /* LINTED pointer */
        sin = (struct sockaddr_in *)&ar.arp_pa;
        sin->sin_family = AF_INET;
        sin->sin_addr.s_addr = inet_addr(name.nodename);
        if (sin->sin_addr.s_addr == (in_addr_t)-1) {
                hp = gethostbyname(name.nodename);
                if (hp == NULL) {
                        return (-1);
                }
                (void) memcpy(&sin->sin_addr, hp->h_addr,
                    sizeof (sin->sin_addr));
        }
        s = socket(AF_INET, SOCK_DGRAM, 0);
        if (s < 0) {
                return (-1);
        }
        if (ioctl(s, SIOCGARP, (caddr_t)&ar) < 0) {
                (void) close(s);
                return (-1);
        }
        (void) close(s);
        if (ar.arp_flags & ATF_COM) {
                bcopy(&ar.arp_ha.sa_data, node, 6);
        } else
                return (-1);
        return (0);
}

/*
 * Name:        get_ethernet_address
 *
 * Description: Obtains the system ethernet address.
 *
 * Returns:     0 on success, non-zero otherwise.  The system ethernet
 *              address is copied into the passed-in variable.
 */
int
get_ethernet_address(uuid_node_t *node)
{
        walker_arg_t    state;

        if (arp_get(node) == 0)
                return (0);

        /*
         * Try to get physical (ethernet) address from network interfaces.
         */
        state.wa_addrvalid = B_FALSE;
        dlpi_walk(get_etheraddr, &state, 0);
        if (state.wa_addrvalid)
                bcopy(state.wa_etheraddr, node, state.wa_etheraddrlen);

        return (state.wa_addrvalid ? 0 : -1);
}

/*
 * Get the physical address via DLPI and update the flag to true upon success.
 */
static boolean_t
get_etheraddr(const char *linkname, void *arg)
{
        int             retval;
        dlpi_handle_t   dh;
        walker_arg_t    *statep = arg;

        if (dlpi_open(linkname, &dh, 0) != DLPI_SUCCESS)
                return (B_FALSE);

        statep->wa_etheraddrlen = DLPI_PHYSADDR_MAX;
        retval = dlpi_get_physaddr(dh, DL_CURR_PHYS_ADDR,
            statep->wa_etheraddr, &(statep->wa_etheraddrlen));

        dlpi_close(dh);

        if (retval == DLPI_SUCCESS) {
                statep->wa_addrvalid = B_TRUE;
                return (B_TRUE);
        }
        return (B_FALSE);
}