net/mac-to-devinfo/files/ip-to-devinfo

   1 #!/bin/sh
   2 #    ip-to-devinfo - IP (through arping or ping and arp cache) to MAC IEEE and
   3 #    custom information
   4 #    Copyright (C) 2009  Daniel Dickinson
   5
   6 #    This program is free software; you can redistribute it and/or modify
   7 #    it under the terms of the GNU General Public License as published by
   8 #    the Free Software Foundation; either version 2 of the License, or
   9 #    (at your option) any later version.
  10
  11 #    This program is distributed in the hope that it will be useful,
  12 #    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 #    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 #    GNU General Public License for more details.
  15
  16 #    You should have received a copy of the GNU General Public License along
  17 #    with this program; if not, write to the Free Software Foundation, Inc.,
  18 #    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19
  20 ARP=arp
  21 MACTODEV=mac-to-devinfo
  22
  23 usage() {
  24     echo "Usage: $0 [-i interface] [-x port] IP-address"
  25 }
  26
  27 if [ "$1" == "-i" ]; then
  28     INTERFACE="$2"
  29     if [ -z "$INTERFACE" ]; then
  30         echo "-i without interface"
  31         usage
  32         exit 1
  33     fi
  34     shift
  35     shift
  36 fi
  37
  38 if [ "$1" == "-x" ]; then
  39     PORT="-x $2"
  40     if [ -z "$PORT" ]; then
  41         echo "-x without the port"
  42         usage
  43         exit 1
  44     fi
  45     shift
  46     shift
  47 fi
  48
  49 IP="$1"
  50 shift
  51
  52 if [ -z "$IP" ]; then
  53         echo "Must specify IP address"
  54         usage
  55         exit 1
  56 fi
  57
  58
  59 if [ ! -x "$(which $ARP)" ]; then
  60     do_arp() {
  61         cat /proc/net/arp
  62     }
  63     ARPMACFIELD=4
  64 else
  65     do_arp() {
  66         $ARP -n
  67     }
  68     ARPMACFIELD=3
  69 fi
  70
  71 if [ -z "$INTERFACE" ]; then
  72     ping -q -c 2 $IP >/dev/null
  73     MAC=$(do_arp|grep "$IP "|tr -s \  | cut -f$ARPMACFIELD -d\  )
  74 else
  75     MAC=$(arping -f -c 5 -I $INTERFACE $IP | grep 'Unicast reply from' | cut -f2 -d \[ | cut -f1 -d\])
  76 fi
  77
  78 $MACTODEV $PORT $MAC
  79
  80