ip/routel

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0
   3
   4 #
   5 # Script created by: Stephen R. van den Berg <srb@cuci.nl>, 1999/04/18
   6 # Donated to the public domain.
   7 #
   8 # This script transforms the output of "ip" into more readable text.
   9 # "ip" is the Linux-advanced-routing configuration tool part of the
  10 # iproute package.
  11 #
  12
  13 test "X-h" = "X$1" && echo "Usage: $0 [tablenr [raw ip args...]]" && exit 64
  14
  15 test -z "$*" && set 0
  16
  17 ip route list table "$@" |
  18  while read network rest
  19  do set xx $rest
  20     shift
  21     proto=""
  22     via=""
  23     dev=""
  24     scope=""
  25     src=""
  26     table=""
  27     case $network in
  28        broadcast|local|unreachable) via=$network
  29           network=$1
  30           shift
  31           ;;
  32     esac
  33     while test $# != 0
  34     do
  35        case "$1" in
  36           proto|via|dev|scope|src|table)
  37              key=$1
  38              val=$2
  39              eval "$key='$val'"
  40              shift 2
  41              ;;
  42           dead|onlink|pervasive|offload|notify|linkdown|unresolved)
  43              shift
  44              ;;
  45           *)
  46              # avoid infinite loop on unknown keyword without value at line end
  47              shift
  48              shift
  49              ;;
  50        esac
  51     done
  52     echo "$network      $via    $src    $proto  $scope  $dev    $table"
  53  done | awk -F '        ' '
  54 BEGIN {
  55    format="%15s%-3s %15s %15s %8s %8s%7s %s\n";
  56    printf(format,"target","","gateway","source","proto","scope","dev","tbl");
  57  }
  58  { network=$1;
  59    mask="";
  60    if(match(network,"/"))
  61     { mask=" "substr(network,RSTART+1);
  62       network=substr(network,0,RSTART);
  63     }
  64    via=$2;
  65    src=$3;
  66    proto=$4;
  67    scope=$5;
  68    dev=$6;
  69    table=$7;
  70    printf(format,network,mask,via,src,proto,scope,dev,table);
  71  }
  72 '