chiark - git - jdamery - source-route-watch/blob - source-route-watch.sh

   1 #! /bin/bash
   2 set -ex
   3
   4 while true
   5 do
   6     stdbuf -oL ip monitor route | (
   7         while read X
   8         do
   9             read -t 1 -N 100000 || true # clear stdin
  10             for int in $( sed -n '/# local/,$ { /^[^#]/ s/.* // p }' /etc/iproute2/rt_tables )
  11             do
  12                 tab=$(ip -6 route list table "$int" |
  13                              sed 's/\(dev [^ ]*\) .*/\1/')
  14                 def=$(ip -6 route list match default |
  15                              sed -n '/dev '"$int"'/ {
  16                                      s/\(dev [^ ]*\) .*/\1/
  17                                      p
  18                                      }')
  19                 if [ "x$def" != "x$tab" ]
  20                 then
  21                     ip -6 route del $tab table "$int" || true
  22                     ip -6 route add $def table "$int" || true
  23                     ip -6 rule del table "$int" || true
  24                     ip -6 rule add from $(
  25                         ip -6 addr show "$int" scope global | sed -n '
  26                              /inet6/ {
  27                                  s/.*inet6 //
  28                                  s/ .*//
  29                                  p
  30                                  }') table "$int"
  31                 fi
  32             done
  33         done
  34     )
  35 done