sbin/ifconfig/af_link.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * $FreeBSD: src/sbin/ifconfig/af_link.c,v 1.2 2004/12/31 19:46:27 sam Exp $
  30  * $DragonFly: src/sbin/ifconfig/af_link.c,v 1.2 2006/09/03 02:01:52 sephe Exp $
  31  */
  32
  33 #include <sys/types.h>
  34 #include <sys/ioctl.h>
  35 #include <sys/socket.h>
  36 #include <net/if.h>
  37 #include <net/route.h>          /* for RTX_IFA */
  38
  39 #include <err.h>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43
  44 #include <net/if_dl.h>
  45 #include <net/if_types.h>
  46 #include <net/ethernet.h>
  47
  48 #include "ifconfig.h"
  49
  50 static struct ifreq link_ridreq;
  51
  52 static void
  53 link_status(int s __unused, const struct rt_addrinfo *info)
  54 {
  55         const struct sockaddr_dl *sdl =
  56                 (const struct sockaddr_dl *) info->rti_info[RTAX_IFA];
  57
  58         if (sdl != NULL && sdl->sdl_alen > 0) {
  59                 if (sdl->sdl_type == IFT_ETHER &&
  60                     sdl->sdl_alen == ETHER_ADDR_LEN)
  61                         printf("\tether %s\n",
  62                             ether_ntoa((const struct ether_addr *)LLADDR(sdl)));
  63                 else {
  64                         int n = sdl->sdl_nlen > 0 ? sdl->sdl_nlen + 1 : 0;
  65
  66                         printf("\tlladdr %s\n", link_ntoa(sdl) + n);
  67                 }
  68         }
  69 }
  70
  71 static void
  72 link_getaddr(const char *addr, int which)
  73 {
  74         char *temp;
  75         struct sockaddr_dl sdl;
  76         struct sockaddr *sa = &link_ridreq.ifr_addr;
  77
  78         if (which != ADDR)
  79                 errx(1, "can't set link-level netmask or broadcast");
  80         if ((temp = malloc(strlen(addr) + 2)) == NULL)
  81                 errx(1, "malloc failed");
  82         temp[0] = ':';
  83         strcpy(temp + 1, addr);
  84         sdl.sdl_len = sizeof(sdl);
  85         link_addr(temp, &sdl);
  86         free(temp);
  87         if (sdl.sdl_alen > sizeof(sa->sa_data))
  88                 errx(1, "malformed link-level address");
  89         sa->sa_family = AF_LINK;
  90         sa->sa_len = sdl.sdl_alen;
  91         bcopy(LLADDR(&sdl), sa->sa_data, sdl.sdl_alen);
  92 }
  93
  94 static struct afswtch af_link = {
  95         .af_name        = "link",
  96         .af_af          = AF_LINK,
  97         .af_status      = link_status,
  98         .af_getaddr     = link_getaddr,
  99         .af_aifaddr     = SIOCSIFLLADDR,
 100         .af_addreq      = &link_ridreq,
 101 };
 102 static struct afswtch af_ether = {
 103         .af_name        = "ether",
 104         .af_af          = AF_LINK,
 105         .af_status      = link_status,
 106         .af_getaddr     = link_getaddr,
 107         .af_aifaddr     = SIOCSIFLLADDR,
 108         .af_addreq      = &link_ridreq,
 109 };
 110 static struct afswtch af_lladdr = {
 111         .af_name        = "lladdr",
 112         .af_af          = AF_LINK,
 113         .af_status      = link_status,
 114         .af_getaddr     = link_getaddr,
 115         .af_aifaddr     = SIOCSIFLLADDR,
 116         .af_addreq      = &link_ridreq,
 117 };
 118
 119 static __constructor void
 120 link_ctor(void)
 121 {
 122         af_register(&af_link);
 123         af_register(&af_ether);
 124         af_register(&af_lladdr);
 125 }