examples/functions/inetaddr

   1 #
   2 # inet2hex - Internet address conversion, dotted-decimal to hex
   3 #
   4 inet2hex ()
   5 {
   6         local IFS
   7
   8         IFS=.
   9         set -- $1
  10
  11         if (( $# != 4 )); then
  12                 echo "inet2hex: incorrect input format: $1" >&2
  13                 echo "inet2hex: usage: inet2hex XX.XX.XX.XX" >&2
  14                 return 2
  15         fi
  16
  17         printf "0x%02x%02x%02x%02x\n" $1 $2 $3 $4
  18 }
  19
  20 #
  21 # hex2inet - Internet address conversion, hex to dotted-decimal
  22 #
  23 hex2inet ()
  24 {
  25         local x1 x2 x3 x4
  26         local rev
  27
  28         OPTIND=1
  29         while getopts "r" o
  30         do
  31                 case "$o" in
  32                 r)      rev=true;;
  33                 *)      echo "hex2inet: usage: hex2inet [-r] [0x]XXXXXXXX" >&2 ; exit 2;;
  34                 esac
  35         done
  36         shift $(( $OPTIND - 1 ))
  37
  38         case "$1" in
  39         0x*)    h=${1#??} ;;
  40         *)      h=$1 ;;
  41         esac
  42
  43         if (( ${#h} != 8 )); then
  44                 echo "hex2inet: $h not in inet format" >&2
  45                 echo "hex2inet: usage: hex2inet [0x]XXXXXXXX" >&2
  46                 return 2
  47         fi
  48
  49         x1=$(( 0x${h:0:2} ))
  50         x2=$(( 0x${h:2:2} ))
  51         x3=$(( 0x${h:4:2} ))
  52         x4=$(( 0x${h:6:2} ))
  53
  54         if [ -z "$rev" ] ; then
  55                 printf "%d.%d.%d.%d\n" $x1 $x2 $x3 $x4
  56         else
  57                 printf "%d.%d.%d.%d\n" $x4 $x3 $x2 $x1
  58         fi
  59         return 0
  60 }