odhcp6c-example-script.sh

   1 #!/bin/sh
   2 [ -z "$2" ] && echo "Error: should be run by odhcpc6c" && exit 1
   3
   4 update_resolv() {
   5         local device="$1"
   6         local dns="$2"
   7
   8         (
   9                 flock -n 9
  10                 grep -v "#odhcp6c:$device:" /etc/resolv.conf > /tmp/resolv.conf.tmp
  11                 for c in $dns; do
  12                         echo "nameserver $c #odhcp6c:$device:" >> /tmp/resolv.conf.tmp
  13                 done
  14                 mv /tmp/resolv.conf.tmp /etc/resolv.conf
  15         ) 9>/tmp/resolv.conf.lock
  16         rm -f /tmp/resolv.conf.lock /tmp/resolv.conf.tmp
  17 }
  18
  19 setup_interface () {
  20         local device="$1"
  21
  22         # Merge RA-DNS
  23         for radns in $RA_DNS; do
  24                 local duplicate=0
  25                 for dns in $RDNSS; do
  26                         [ "$radns" = "$dns" ] && duplicate=1
  27                 done
  28                 [ "$duplicate" = 0 ] && RDNSS="$RDNSS $radns"
  29         done
  30
  31         local dnspart=""
  32         for dns in $RDNSS; do
  33                 if [ -z "$dnspart" ]; then
  34                         dnspart="\"$dns\""
  35                 else
  36                         dnspart="$dnspart, \"$dns\""
  37                 fi
  38         done
  39
  40         update_resolv "$device" "$dns"
  41
  42         local prefixpart=""
  43         for entry in $PREFIXES; do
  44                 local addr="${entry%%,*}"
  45                 entry="${entry#*,}"
  46                 local preferred="${entry%%,*}"
  47                 entry="${entry#*,}"
  48                 local valid="${entry%%,*}"
  49                 entry="${entry#*,}"
  50                 [ "$entry" = "$valid" ] && entry=
  51
  52                 local class=""
  53                 local excluded=""
  54
  55                 while [ -n "$entry" ]; do
  56                         local key="${entry%%=*}"
  57                         entry="${entry#*=}"
  58                         local val="${entry%%,*}"
  59                         entry="${entry#*,}"
  60                         [ "$entry" = "$val" ] && entry=
  61
  62                         if [ "$key" = "class" ]; then
  63                                 class=", \"class\": $val"
  64                         elif [ "$key" = "excluded" ]; then
  65                                 excluded=", \"excluded\": \"$val\""
  66                         fi
  67                 done
  68
  69                 local prefix="{\"address\": \"$addr\", \"preferred\": $preferred, \"valid\": $valid $class $excluded}"
  70
  71                 if [ -z "$prefixpart" ]; then
  72                         prefixpart="$prefix"
  73                 else
  74                         prefixpart="$prefixpart, $prefix"
  75                 fi
  76
  77                 # TODO: delete this somehow when the prefix disappears
  78                 ip -6 route add unreachable "$addr"
  79         done
  80
  81         ip -6 route flush dev "$device"
  82         ip -6 address flush dev "$device" scope global
  83
  84         # Merge addresses
  85         for entry in $RA_ADDRESSES; do
  86                 local duplicate=0
  87                 local addr="${entry%%/*}"
  88                 for dentry in $ADDRESSES; do
  89                         local daddr="${dentry%%/*}"
  90                         [ "$addr" = "$daddr" ] && duplicate=1
  91                 done
  92                 [ "$duplicate" = "0" ] && ADDRESSES="$ADDRESSES $entry"
  93         done
  94
  95         for entry in $ADDRESSES; do
  96                 local addr="${entry%%,*}"
  97                 entry="${entry#*,}"
  98                 local preferred="${entry%%,*}"
  99                 entry="${entry#*,}"
 100                 local valid="${entry%%,*}"
 101
 102                 ip -6 address add "$addr" dev "$device" preferred_lft "$preferred" valid_lft "$valid"
 103         done
 104
 105         for entry in $RA_ROUTES; do
 106                 local addr="${entry%%,*}"
 107                 entry="${entry#*,}"
 108                 local gw="${entry%%,*}"
 109                 entry="${entry#*,}"
 110                 local valid="${entry%%,*}"
 111                 entry="${entry#*,}"
 112                 local metric="${entry%%,*}"
 113
 114                 if [ -n "$gw" ]; then
 115                         ip -6 route add "$addr" via "$gw" metric "$metric" dev "$device" from "::/128"
 116                 else
 117                         ip -6 route add "$addr" metric "$metric" dev "$device"
 118                 fi
 119
 120                 for prefix in $PREFIXES; do
 121                         local paddr="${prefix%%,*}"
 122                         [ -n "$gw" ] && ip -6 route add "$addr" via "$gw" metric "$metric" dev "$device" from "$paddr"
 123                 done
 124         done
 125 }
 126
 127 teardown_interface() {
 128         local device="$1"
 129         ip -6 route flush dev "$device"
 130         ip -6 address flush dev "$device" scope global
 131         update_resolv "$device" ""
 132 }
 133
 134 case "$2" in
 135         bound)
 136                 teardown_interface "$1"
 137                 setup_interface "$1"
 138         ;;
 139         informed|updated|rebound|ra-updated)
 140                 setup_interface "$1"
 141         ;;
 142         stopped|unbound)
 143                 teardown_interface "$1"
 144         ;;
 145         started)
 146                 teardown_interface "$1"
 147         ;;
 148 esac
 149
 150 # user rules
 151 [ -f /etc/odhcp6c.user ] && . /etc/odhcp6c.user
 152
 153 exit 0