luci-base: add a strict flag to the hostname validator

[project/luci.git] / modules / luci-base / luasrc / cbi / datatypes.lua

diff --git a/modules/luci-base/luasrc/cbi/datatypes.lua b/modules/luci-base/luasrc/cbi/datatypes.lua
index 55cdf8a..99113e0 100644 (file)
--- a/modules/luci-base/luasrc/cbi/datatypes.lua
+++ b/modules/luci-base/luasrc/cbi/datatypes.lua
@@ -199,13 +199,13 @@ function macaddr(val)
        return ip.checkmac(val) and true or false
 end
 
-function hostname(val)
+function hostname(val, strict)
        if val and (#val < 254) and (
           val:match("^[a-zA-Z_]+$") or
           (val:match("^[a-zA-Z0-9_][a-zA-Z0-9_%-%.]*[a-zA-Z0-9]$") and
            val:match("[^0-9%.]"))
        ) then
-               return true
+               return (not strict or not val:match("^_"))
        end
        return false
 end