void SendQuery (SimpleResolverEventArgs args, DnsQuery query, bool add_it)
{
// TODO: not sure about reusing IDs when add_it == false
int count = 0;
if (add_it) {
do {
query.Header.ID = (ushort)new Random().Next(1, 65534);
if (count > 500)
throw new InvalidOperationException ("Too many pending queries (or really bad luck)");
} while (AddQuery (query, args) == false);
args.QueryID = query.Header.ID;
} else {
query.Header.ID = args.QueryID;
}
if (args.Timer == null)
args.Timer = new Timer (timeout_cb, args, 5000, Timeout.Infinite);
else
args.Timer.Change (5000, Timeout.Infinite);
client.BeginSend (query.Packet, 0, query.Length, SocketFlags.None, null, null);
}
bool AddQuery (DnsQuery query, SimpleResolverEventArgs args)
{
lock (queries) {
if (queries.ContainsKey (query.Header.ID))
return false;
queries [query.Header.ID] = args;
}
return true;
}