[git commit] dhcp service example: cater for servers hot giving subnet and/or router

[Bernhard Reutner-Fischer]

On 5 February 2019 17:48:24 CET, Denys Vlasenko <vda.linux at googlemail.com> wrote:
>commit:
>https://git.busybox.net/busybox/commit/?id=2feaba1d8dc2893d9f1064673e500312eaa70777
>branch: https://git.busybox.net/busybox/commit/?id=refs/heads/master
>
>Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
>---
> examples/var_service/dhcp_if/convert2ipconf | 19 +++++++++++++++++++
> 1 file changed, 19 insertions(+)
>
>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

I'd suggest "case $ip in" here, fwiw.

Cheers,

>+	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'"
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