domain syntax check for zoneupdate

server/src/com/cloud/configuration/ConfigurationManagerImpl.java

@@ -1187,6 +1187,13 @@ public class ConfigurationManagerImpl implements ConfigurationManager, Configura
         
         // add the domain prefix list to details if not null
         if (dnsSearchOrder != null){
+            for(String dom : dnsSearchOrder){
+                if (!NetUtils.verifyDomainName(dom)) {
+                    throw new InvalidParameterValueException(
+                            "Invalid network domain suffixes. Total length shouldn't exceed 190 chars. Each domain label must be between 1 and 63 characters long, can contain ASCII letters 'a' through 'z', the digits '0' through '9', "
+                            + "and the hyphen ('-'); can't start or end with \"-\"");
+                }
+            }
             newDetails.put(ZoneConfig.DnsSearchOrder.getName(), StringUtils.join(dnsSearchOrder, ","));
         }