X-Git-Url: http://git.grml.org/?a=blobdiff_plain;f=usr_sbin%2Fgrml-hostname;h=b7a6eab8667424bc23c8b97f2a04c07143b6282b;hb=2d67bfb005b9f1c2f94f0cfb350ea47912542c79;hp=b529d1772107c632ef79b92b46880a7b0ca907c6;hpb=9375a86c1fe0f2936a7ff20f46aa98a4d5f1ffb3;p=grml-scripts.git

diff --git a/usr_sbin/grml-hostname b/usr_sbin/grml-hostname
index b529d17..b7a6eab 100755
--- a/usr_sbin/grml-hostname
+++ b/usr_sbin/grml-hostname
@@ -37,6 +37,20 @@ else
   retval=0
 fi
 
+# stupid + simplified checking for valid hostname (according to RFC 952)
+VALIDATE=$(echo "$NEW_HOSTNAME" | tr --delete '[:alnum:]-')
+if [ -n "$VALIDATE" ] ; then
+  if [ -z "$NONINTERACTIVE" ] ; then
+    dialog --title "${PN}" \
+      --msgbox "Error: invalid characters specified in hostname: '$VALIDATE' can not be used inside hostnames." \
+      0 0
+    exec "$0"
+  else
+    echo "Error: invalid characters specified in hostname: '$VALIDATE' can not be used inside hostnames." >&2
+    exit 1
+  fi
+fi
+
 case $retval in
   0)
      echo "$NEW_HOSTNAME" > /etc/hostname