/*
 * Copyright (c) 1983, 1993
 *      The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD: src/sbin/ifconfig/af_link.c,v 1.2 2004/12/31 19:46:27 sam Exp $
 */

#include <sys/types.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/ethernet.h>

#include <err.h>
#include <ifaddrs.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "ifconfig.h"

static struct ifreq link_ridreq;

static void
link_status(int s __unused, const struct ifaddrs *ifa)
{
        struct sockaddr_dl *sdl =
                __DECONST(struct sockaddr_dl *, ifa->ifa_addr);
                /* drop 'const' qualifier for LLADDR() to suppress warning */
        char addr[18], *p;
        int n;

        if (sdl == NULL || sdl->sdl_alen == 0)
                return;

        if (sdl->sdl_type == IFT_ETHER && sdl->sdl_alen == ETHER_ADDR_LEN) {
                ether_ntoa_r((const struct ether_addr *)LLADDR(sdl), addr);
                if (f_ether != NULL && strcmp(f_ether, "dash") == 0) {
                        p = addr;
                        while ((p = strchr(p, ':')) != NULL)
                                *p = '-';
                }
                printf("\tether %s\n", addr);
        } else {
                n = sdl->sdl_nlen > 0 ? sdl->sdl_nlen + 1 : 0;
                printf("\tlladdr %s\n", link_ntoa(sdl) + n);
        }
}

static void
link_getaddr(const char *addr, int which)
{
        struct sockaddr_dl sdl;
        struct sockaddr *sa = &link_ridreq.ifr_addr;
        char *temp;

        if (which != ADDR)
                errx(1, "can't set link-level netmask or broadcast");
        if ((temp = malloc(strlen(addr) + 2)) == NULL)
                errx(1, "malloc failed");
        temp[0] = ':';
        strcpy(temp + 1, addr);
        sdl.sdl_len = sizeof(sdl);
        link_addr(temp, &sdl);
        free(temp);
        if (sdl.sdl_alen > sizeof(sa->sa_data))
                errx(1, "malformed link-level address");
        sa->sa_family = AF_LINK;
        sa->sa_len = sdl.sdl_alen;
        memcpy(sa->sa_data, LLADDR(&sdl), sdl.sdl_alen);
}

static struct afswtch af_link = {
        .af_name        = "link",
        .af_af          = AF_LINK,
        .af_status      = link_status,
        .af_getaddr     = link_getaddr,
        .af_aifaddr     = SIOCSIFLLADDR,
        .af_addreq      = &link_ridreq,
};
static struct afswtch af_ether = {
        .af_name        = "ether",
        .af_af          = AF_LINK,
        .af_status      = link_status,
        .af_getaddr     = link_getaddr,
        .af_aifaddr     = SIOCSIFLLADDR,
        .af_addreq      = &link_ridreq,
};
static struct afswtch af_lladdr = {
        .af_name        = "lladdr",
        .af_af          = AF_LINK,
        .af_status      = link_status,
        .af_getaddr     = link_getaddr,
        .af_aifaddr     = SIOCSIFLLADDR,
        .af_addreq      = &link_ridreq,
};

__constructor(111)
static void
link_ctor(void)
{
        af_register(&af_link);
        af_register(&af_ether);
        af_register(&af_lladdr);
}