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dhcp service example: cater for servers hot giving subnet and/or router

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2019-02-05 17:48:24 +01:00
parent 779f96a24c
commit 2feaba1d8d
1 changed files with 19 additions and 0 deletions
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19
examples/var_service/dhcp_if/convert2ipconf
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@ -26,6 +26,25 @@ exec 2>&1
test "$interface" || exit 1 test "$interface" || exit 1
test "$ip" || exit 1 test "$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" echo "let cfg=cfg+1"
test "$interface" && echo "if[\$cfg]='$interface'" test "$interface" && echo "if[\$cfg]='$interface'"