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authorGravatar Denys Vlasenko <vda.linux@googlemail.com>2019-02-05 17:48:24 +0100
committerGravatar Denys Vlasenko <vda.linux@googlemail.com>2019-02-05 17:48:24 +0100
commit2feaba1d8dc2893d9f1064673e500312eaa70777 (patch)
tree47b86c6692b613859535e2ddc98cdfef1a112482
parent779f96a24c43209be841f9cc0e7715a2c57db487 (diff)
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busybox-2feaba1d8dc2893d9f1064673e500312eaa70777.tar.bz2
dhcp service example: cater for servers hot giving subnet and/or router
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-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 62a288ebf..038b1f7f1 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'"