Add example status script

diff --git a/odhcp6c-example-script.sh b/odhcp6c-example-script.sh
new file mode 100755 (executable)
index 0000000..6215257
--- /dev/null
+++ b/odhcp6c-example-script.sh
@@ -0,0 +1,153 @@
+#!/bin/sh
+[ -z "$2" ] && echo "Error: should be run by odhcpc6c" && exit 1
+
+update_resolv() {
+       local device="$1"
+       local dns="$2"
+       
+       (
+               flock -n 9
+               grep -v "#odhcp6c:$device:" /etc/resolv.conf > /tmp/resolv.conf.tmp
+               for c in $dns; do
+                       echo "nameserver $c #odhcp6c:$device:" >> /tmp/resolv.conf.tmp
+               done
+               mv /tmp/resolv.conf.tmp /etc/resolv.conf
+       ) 9>/tmp/resolv.conf.lock
+       rm -f /tmp/resolv.conf.lock /tmp/resolv.conf.tmp
+}
+
+setup_interface () {
+       local device="$1"
+
+       # Merge RA-DNS
+       for radns in $RA_DNS; do
+               local duplicate=0
+               for dns in $RDNSS; do
+                       [ "$radns" = "$dns" ] && duplicate=1
+               done
+               [ "$duplicate" = 0 ] && RDNSS="$RDNSS $radns"
+       done
+
+       local dnspart=""
+       for dns in $RDNSS; do
+               if [ -z "$dnspart" ]; then
+                       dnspart="\"$dns\""
+               else
+                       dnspart="$dnspart, \"$dns\""
+               fi
+       done
+
+       update_resolv "$device" "$dns"
+
+       local prefixpart=""
+       for entry in $PREFIXES; do
+               local addr="${entry%%,*}"
+                entry="${entry#*,}"
+                local preferred="${entry%%,*}"
+                entry="${entry#*,}"
+                local valid="${entry%%,*}"
+                entry="${entry#*,}"
+               [ "$entry" = "$valid" ] && entry=
+
+               local class=""
+               local excluded=""
+
+               while [ -n "$entry" ]; do
+                       local key="${entry%%=*}"
+                       entry="${entry#*=}"
+                       local val="${entry%%,*}"
+                       entry="${entry#*,}"
+                       [ "$entry" = "$val" ] && entry=
+
+                       if [ "$key" = "class" ]; then
+                               class=", \"class\": $val"
+                       elif [ "$key" = "excluded" ]; then
+                               excluded=", \"excluded\": \"$val\""
+                       fi
+               done
+
+               local prefix="{\"address\": \"$addr\", \"preferred\": $preferred, \"valid\": $valid $class $excluded}"
+               
+               if [ -z "$prefixpart" ]; then
+                       prefixpart="$prefix"
+               else
+                       prefixpart="$prefixpart, $prefix"
+               fi
+
+               # TODO: delete this somehow when the prefix disappears
+               ip -6 route add unreachable "$addr"
+       done
+
+       ip -6 route flush dev "$device"
+       ip -6 address flush dev "$device" scope global
+
+       # Merge addresses
+       for entry in $RA_ADDRESSES; do
+               local duplicate=0
+               local addr="${entry%%/*}"
+               for dentry in $ADDRESSES; do
+                       local daddr="${dentry%%/*}"
+                       [ "$addr" = "$daddr" ] && duplicate=1
+               done
+               [ "$duplicate" = "0" ] && ADDRESSES="$ADDRESSES $entry"
+       done
+
+       for entry in $ADDRESSES; do
+               local addr="${entry%%,*}"
+               entry="${entry#*,}"
+               local preferred="${entry%%,*}"
+               entry="${entry#*,}"
+               local valid="${entry%%,*}"
+
+               ip -6 address add "$addr" dev "$device" preferred_lft "$preferred" valid_lft "$valid" 
+       done
+
+       for entry in $RA_ROUTES; do
+               local addr="${entry%%,*}"
+               entry="${entry#*,}"
+               local gw="${entry%%,*}"
+               entry="${entry#*,}"
+               local valid="${entry%%,*}"
+               entry="${entry#*,}"
+               local metric="${entry%%,*}"
+
+               if [ -n "$gw" ]; then
+                       ip -6 route add "$addr" via "$gw" metric "$metric" dev "$device" from "::/128"
+               else
+                       ip -6 route add "$addr" metric "$metric" dev "$device"
+               fi
+
+               for prefix in $PREFIXES; do
+                       local paddr="${prefix%%,*}"
+                       [ -n "$gw" ] && ip -6 route add "$addr" via "$gw" metric "$metric" dev "$device" from "$paddr"
+               done
+       done
+}
+
+teardown_interface() {
+       local device="$1"
+       ip -6 route flush dev "$device"
+       ip -6 address flush dev "$device" scope global
+       update_resolv "$device" ""
+}
+
+case "$2" in
+       bound)
+               teardown_interface "$1"
+               setup_interface "$1"
+       ;;
+       informed|updated|rebound|ra-updated)
+               setup_interface "$1"
+       ;;
+       stopped|unbound)
+               teardown_interface "$1"
+       ;;
+       started)
+               teardown_interface "$1"
+       ;;
+esac
+
+# user rules
+[ -f /etc/odhcp6c.user ] && . /etc/odhcp6c.user
+
+exit 0