usr/src/lib/libuuid/common/etheraddr.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #pragma ident   "%Z%%M% %I%     %E% SMI"
  27
  28 #include <stdlib.h>
  29 #include <stdio.h>
  30 #include <strings.h>
  31 #include <stropts.h>
  32 #include <unistd.h>
  33 #include <uuid/uuid.h>
  34 #include <sys/sockio.h>
  35 #include <libdlpi.h>
  36 #include <sys/utsname.h>
  37
  38 #include <netdb.h>
  39 #include <netinet/in.h>
  40 #include <arpa/inet.h>
  41
  42 #include "etheraddr.h"
  43
  44 static boolean_t get_etheraddr(const char *linkname, void *arg);
  45
  46 /*
  47  * get an individual arp entry
  48  */
  49 int
  50 arp_get(uuid_node_t *node)
  51 {
  52         struct utsname name;
  53         struct arpreq ar;
  54         struct hostent *hp;
  55         struct sockaddr_in *sin;
  56         int s;
  57
  58         if (uname(&name) == -1) {
  59                 return (-1);
  60         }
  61         (void) memset(&ar, 0, sizeof (ar));
  62         ar.arp_pa.sa_family = AF_INET;
  63         /* LINTED pointer */
  64         sin = (struct sockaddr_in *)&ar.arp_pa;
  65         sin->sin_family = AF_INET;
  66         sin->sin_addr.s_addr = inet_addr(name.nodename);
  67         if (sin->sin_addr.s_addr == (in_addr_t)-1) {
  68                 hp = gethostbyname(name.nodename);
  69                 if (hp == NULL) {
  70                         return (-1);
  71                 }
  72                 (void) memcpy(&sin->sin_addr, hp->h_addr,
  73                     sizeof (sin->sin_addr));
  74         }
  75         s = socket(AF_INET, SOCK_DGRAM, 0);
  76         if (s < 0) {
  77                 return (-1);
  78         }
  79         if (ioctl(s, SIOCGARP, (caddr_t)&ar) < 0) {
  80                 (void) close(s);
  81                 return (-1);
  82         }
  83         (void) close(s);
  84         if (ar.arp_flags & ATF_COM) {
  85                 bcopy(&ar.arp_ha.sa_data, node, 6);
  86         } else
  87                 return (-1);
  88         return (0);
  89 }
  90
  91 /*
  92  * Name:        get_ethernet_address
  93  *
  94  * Description: Obtains the system ethernet address.
  95  *
  96  * Returns:     0 on success, non-zero otherwise.  The system ethernet
  97  *              address is copied into the passed-in variable.
  98  */
  99 int
 100 get_ethernet_address(uuid_node_t *node)
 101 {
 102         walker_arg_t    state;
 103
 104         if (arp_get(node) == 0)
 105                 return (0);
 106
 107         /*
 108          * Try to get physical (ethernet) address from network interfaces.
 109          */
 110         state.wa_addrvalid = B_FALSE;
 111         dlpi_walk(get_etheraddr, &state, 0);
 112         if (state.wa_addrvalid)
 113                 bcopy(state.wa_etheraddr, node, state.wa_etheraddrlen);
 114
 115         return (state.wa_addrvalid ? 0 : -1);
 116 }
 117
 118 /*
 119  * Get the physical address via DLPI and update the flag to true upon success.
 120  */
 121 static boolean_t
 122 get_etheraddr(const char *linkname, void *arg)
 123 {
 124         int             retval;
 125         dlpi_handle_t   dh;
 126         walker_arg_t    *statep = arg;
 127
 128         if (dlpi_open(linkname, &dh, 0) != DLPI_SUCCESS)
 129                 return (B_FALSE);
 130
 131         statep->wa_etheraddrlen = DLPI_PHYSADDR_MAX;
 132         retval = dlpi_get_physaddr(dh, DL_CURR_PHYS_ADDR,
 133             statep->wa_etheraddr, &(statep->wa_etheraddrlen));
 134
 135         dlpi_close(dh);
 136
 137         if (retval == DLPI_SUCCESS) {
 138                 statep->wa_addrvalid = B_TRUE;
 139                 return (B_TRUE);
 140         }
 141         return (B_FALSE);
 142 }