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|
# support for RFC3442 routes in DHCP RENEW
function convert_to_cidr () {
cidr=""
set -- $1
while [ $# -gt 0 ]; do
net_length=$1
case $net_length in
32|31|30|29|28|27|26|25)
if [ $# -lt 9 ]; then
return 1
fi
net_address="${2}.${3}.${4}.${5}"
gateway="${6}.${7}.${8}.${9}"
shift 9
;;
24|23|22|21|20|19|18|17)
if [ $# -lt 8 ]; then
return 1
fi
net_address="${2}.${3}.${4}.0"
gateway="${5}.${6}.${7}.${8}"
shift 8
;;
16|15|14|13|12|11|10|9)
if [ $# -lt 7 ]; then
return 1
fi
net_address="${2}.${3}.0.0"
gateway="${4}.${5}.${6}.${7}"
shift 7
;;
8|7|6|5|4|3|2|1)
if [ $# -lt 6 ]; then
return 1
fi
net_address="${2}.0.0.0"
gateway="${3}.${4}.${5}.${6}"
shift 6
;;
0) # default route
if [ $# -lt 5 ]; then
return 1
fi
net_address="0.0.0.0"
gateway="${2}.${3}.${4}.${5}"
shift 5
;;
*) # error
return 1
;;
esac
cidr+="${net_address}/${net_length}:${gateway} "
done
}
# main script starts here
RUN="yes"
if [ "$RUN" = "yes" ]; then
convert_to_cidr "$old_rfc3442_classless_static_routes"
old_cidr=$cidr
convert_to_cidr "$new_rfc3442_classless_static_routes"
new_cidr=$cidr
if [ "$reason" = "RENEW" ]; then
if [ "$new_rfc3442_classless_static_routes" != "$old_rfc3442_classless_static_routes" ]; then
logmsg info "RFC3442 route change detected, old_routes: $old_rfc3442_classless_static_routes"
logmsg info "RFC3442 route change detected, new_routes: $new_rfc3442_classless_static_routes"
if [ -z "$new_rfc3442_classless_static_routes" ]; then
# delete all routes from the old_rfc3442_classless_static_routes
for route in $old_cidr; do
network=$(printf "${route}" | awk -F ":" '{print $1}')
gateway=$(printf "${route}" | awk -F ":" '{print $2}')
# take care of link-local routes
if [ "${gateway}" != '0.0.0.0' ]; then
via_arg="via ${gateway}"
else
via_arg=""
fi
ip -4 route del "${network}" "${via_arg}" dev "${interface}" >/dev/null 2>&1
done
elif [ -z "$old_rfc3442_classless_static_routes" ]; then
# add all routes from the new_rfc3442_classless_static_routes
for route in $new_cidr; do
network=$(printf "${route}" | awk -F ":" '{print $1}')
gateway=$(printf "${route}" | awk -F ":" '{print $2}')
# take care of link-local routes
if [ "${gateway}" != '0.0.0.0' ]; then
via_arg="via ${gateway}"
else
via_arg=""
fi
ip -4 route add "${network}" "${via_arg}" dev "${interface}" >/dev/null 2>&1
done
else
# update routes
# delete old
for old_route in $old_cidr; do
match="false"
for new_route in $new_cidr; do
if [[ "$old_route" == "$new_route" ]]; then
match="true"
break
fi
done
if [[ "$match" == "false" ]]; then
# delete old_route
network=$(printf "${old_route}" | awk -F ":" '{print $1}')
gateway=$(printf "${old_route}" | awk -F ":" '{print $2}')
# take care of link-local routes
if [ "${gateway}" != '0.0.0.0' ]; then
via_arg="via ${gateway}"
else
via_arg=""
fi
ip -4 route del "${network}" "${via_arg}" dev "${interface}" >/dev/null 2>&1
fi
done
# add new
for new_route in $new_cidr; do
match="false"
for old_route in $old_cidr; do
if [[ "$new_route" == "$old_route" ]]; then
match="true"
break
fi
done
if [[ "$match" == "false" ]]; then
# add new_route
network=$(printf "${new_route}" | awk -F ":" '{print $1}')
gateway=$(printf "${new_route}" | awk -F ":" '{print $2}')
# take care of link-local routes
if [ "${gateway}" != '0.0.0.0' ]; then
via_arg="via ${gateway}"
else
via_arg=""
fi
ip -4 route add "${network}" "${via_arg}" dev "${interface}" >/dev/null 2>&1
fi
done
fi
fi
fi
fi
|
