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="$2"
   7
   8         (
   9                 flock 9
  10                 grep -v "#odhcp6c:$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                 chmod 0644 /etc/resolv.conf
  16         ) 9>/tmp/resolv.conf.lock
  17         rm -f /tmp/resolv.conf.lock /tmp/resolv.conf.tmp
  18 }
  19
  20 setup_interface () {
  21         local device="$1"
  22
  23         # Merge RA-DNS
  24         for radns in $RA_DNS; do
  25                 local duplicate=0
  26                 for dns in $RDNSS; do
  27                         [ "$radns" = "$dns" ] && duplicate=1
  28                 done
  29                 [ "$duplicate" = 0 ] && RDNSS="$RDNSS $radns"
  30         done
  31
  32         local dnspart=""
  33         for dns in $RDNSS; do
  34                 if [ -z "$dnspart" ]; then
  35                         dnspart="\"$dns\""
  36                 else
  37                         dnspart="$dnspart, \"$dns\""
  38                 fi
  39         done
  40
  41         update_resolv "$device" "$dns"
  42
  43         local prefixpart=""
  44         for entry in $PREFIXES; do
  45                 local addr="${entry%%,*}"
  46                 entry="${entry#*,}"
  47                 local preferred="${entry%%,*}"
  48                 entry="${entry#*,}"
  49                 local valid="${entry%%,*}"
  50                 entry="${entry#*,}"
  51                 [ "$entry" = "$valid" ] && entry=
  52
  53                 local class=""
  54                 local excluded=""
  55
  56                 while [ -n "$entry" ]; do
  57                         local key="${entry%%=*}"
  58                         entry="${entry#*=}"
  59                         local val="${entry%%,*}"
  60                         entry="${entry#*,}"
  61                         [ "$entry" = "$val" ] && entry=
  62
  63                         if [ "$key" = "class" ]; then
  64                                 class=", \"class\": $val"
  65                         elif [ "$key" = "excluded" ]; then
  66                                 excluded=", \"excluded\": \"$val\""
  67                         fi
  68                 done
  69
  70                 local prefix="{\"address\": \"$addr\", \"preferred\": $preferred, \"valid\": $valid $class $excluded}"
  71
  72                 if [ -z "$prefixpart" ]; then
  73                         prefixpart="$prefix"
  74                 else
  75                         prefixpart="$prefixpart, $prefix"
  76                 fi
  77
  78                 # TODO: delete this somehow when the prefix disappears
  79                 ip -6 route add unreachable "$addr"
  80         done
  81
  82         ip -6 route flush dev "$device"
  83         ip -6 address flush dev "$device" scope global
  84
  85         # Merge addresses
  86         for entry in $RA_ADDRESSES; do
  87                 local duplicate=0
  88                 local addr="${entry%%/*}"
  89                 for dentry in $ADDRESSES; do
  90                         local daddr="${dentry%%/*}"
  91                         [ "$addr" = "$daddr" ] && duplicate=1
  92                 done
  93                 [ "$duplicate" = "0" ] && ADDRESSES="$ADDRESSES $entry"
  94         done
  95
  96         for entry in $ADDRESSES; do
  97                 local addr="${entry%%,*}"
  98                 entry="${entry#*,}"
  99                 local preferred="${entry%%,*}"
 100                 entry="${entry#*,}"
 101                 local valid="${entry%%,*}"
 102
 103                 ip -6 address add "$addr" dev "$device" preferred_lft "$preferred" valid_lft "$valid"
 104         done
 105
 106         for entry in $RA_ROUTES; do
 107                 local addr="${entry%%,*}"
 108                 entry="${entry#*,}"
 109                 local gw="${entry%%,*}"
 110                 entry="${entry#*,}"
 111                 local valid="${entry%%,*}"
 112                 entry="${entry#*,}"
 113                 local metric="${entry%%,*}"
 114
 115                 if [ -n "$gw" ]; then
 116                         ip -6 route add "$addr" via "$gw" metric "$metric" dev "$device" from "::/128"
 117                 else
 118                         ip -6 route add "$addr" metric "$metric" dev "$device"
 119                 fi
 120
 121                 for prefix in $PREFIXES; do
 122                         local paddr="${prefix%%,*}"
 123                         [ -n "$gw" ] && ip -6 route add "$addr" via "$gw" metric "$metric" dev "$device" from "$paddr"
 124                 done
 125         done
 126 }
 127
 128 teardown_interface() {
 129         local device="$1"
 130         ip -6 route flush dev "$device"
 131         ip -6 address flush dev "$device" scope global
 132         update_resolv "$device" ""
 133 }
 134
 135 (
 136         flock 9
 137         case "$2" in
 138                 bound)
 139                         teardown_interface "$1"
 140                         setup_interface "$1"
 141                 ;;
 142                 informed|updated|rebound|ra-updated)
 143                         setup_interface "$1"
 144                 ;;
 145                 stopped|unbound)
 146                         teardown_interface "$1"
 147                 ;;
 148                 started)
 149                         teardown_interface "$1"
 150                 ;;
 151         esac
 152
 153         # user rules
 154         [ -f /etc/odhcp6c.user ] && . /etc/odhcp6c.user
 155 ) 9>/tmp/odhcp6c.lock.$1
 156 rm -f /tmp/odhcp6c.lock.$1