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-rwxr-xr-xexamples/var_service/dhcp_if/convert2ipconf19
1 files changed, 19 insertions, 0 deletions
diff --git a/examples/var_service/dhcp_if/convert2ipconf b/examples/var_service/dhcp_if/convert2ipconf
index 62a288e..038b1f7 100755
--- a/examples/var_service/dhcp_if/convert2ipconf
+++ b/examples/var_service/dhcp_if/convert2ipconf
@@ -26,6 +26,25 @@ exec 2>&1
test "$interface" || exit 1
test "$ip" || exit 1
+# some servers do not return subnet option.
+# guess it for standard private networks.
+if ! test "$mask"; then
+ if test "$ip" != "${ip#192.168.}"; then
+ mask=16
+ elif test "$ip" != "${ip#172.16.}"; then
+ mask=12
+ # repeat for each in 172.17. - 172.31. range?
+ elif test "$ip" != "${ip#10.}"; then
+ mask=8
+ fi
+fi
+
+# some servers do not return router option.
+# assume DHCP server is the router.
+if ! test "$router"; then
+ test "$serverid" && router="$serverid"
+fi
+
{
echo "let cfg=cfg+1"
test "$interface" && echo "if[\$cfg]='$interface'"