freebsd-dev/sbin/ifconfig/af_link.c

/*
 * 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.
 * 4. 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.
 */

#ifndef lint
static const char rcsid[] =
  "$FreeBSD$";
#endif /* not lint */

#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/route.h>		/* for RTX_IFA */

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

#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/ethernet.h>

#include "ifconfig.h"

static struct ifreq link_ridreq;

static void
link_status(int s __unused, const struct rt_addrinfo *info)
{
	const struct sockaddr_dl *sdl =
		(const struct sockaddr_dl *) info->rti_info[RTAX_IFA];

	if (sdl != NULL && sdl->sdl_alen > 0) {
		if (sdl->sdl_type == IFT_ETHER &&
		    sdl->sdl_alen == ETHER_ADDR_LEN)
			printf("\tether %s\n",
			    ether_ntoa((const struct ether_addr *)LLADDR(sdl)));
		else {
			int 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)
{
	char *temp;
	struct sockaddr_dl sdl;
	struct sockaddr *sa = &link_ridreq.ifr_addr;

	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;
	bcopy(LLADDR(&sdl), sa->sa_data, 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,
};

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