#!/bin/sh

# SPDX-License-Identifier: GPL-2.0

#

# Script created by: Stephen R. van den Berg <srb@cuci.nl>, 1999/04/18

# Donated to the public domain.

#

# This script transforms the output of "ip" into more readable text.

# "ip" is the Linux-advanced-routing configuration tool part of the

# iproute package.

#

test "X-h" = "X$1" && echo "Usage: $0 [tablenr [raw ip args...]]" && exit 64

test -z "$*" && set 0

ip route list table "$@" |

 while read network rest

 do set xx $rest

    shift

    proto=""

    via=""

    dev=""

    scope=""

    src=""

    table=""

    case $network in

       broadcast|local|unreachable) via=$network

          network=$1

          shift

          ;;

    esac

    while test $# != 0

    do

       case "$1" in

          proto|via|dev|scope|src|table)

             key=$1

             val=$2

             eval "$key='$val'"

             shift 2

             ;;

          dead|onlink|pervasive|offload|notify|linkdown|unresolved)

             shift

             ;;

          *)

             # avoid infinite loop on unknown keyword without value at line end

             shift

             shift

             ;;

       esac

    done

    echo "$network	$via	$src	$proto	$scope	$dev	$table"

 done | awk -F '	' '

BEGIN {

   format="%15s%-3s %15s %15s %8s %8s%7s %s\n";

   printf(format,"target","","gateway","source","proto","scope","dev","tbl");

 }

 { network=$1;

   mask="";

   if(match(network,"/"))

    { mask=" "substr(network,RSTART+1);

      network=substr(network,0,RSTART);

    }

   via=$2;

   src=$3;

   proto=$4;

   scope=$5;

   dev=$6;

   table=$7;

   printf(format,network,mask,via,src,proto,scope,dev,table);

 }

'