static IEnumerable <DnsTransaction.ResourceRecord> readCsv(string file)
{
string line;
using (var reader = File.OpenText(file))
{
while ((line = reader.ReadLine()) != null)
{
// Skip comment
if (line[0] == '#')
{
continue;
}
string[] substr = line.Split(',');
if (substr.Length != 4)
{
continue;
}
DnsTransaction.QTYPE qtype;
if (Enum.TryParse <DnsTransaction.QTYPE>(substr[2], out qtype))
{
byte[] data = null;
switch (qtype)
{
case DnsTransaction.QTYPE.NS:
data = DnsTransaction.getLabelBytes(substr[3]);
break;
case DnsTransaction.QTYPE.AAAA:
case DnsTransaction.QTYPE.A:
IPAddress ip;
ip = IPAddress.Parse(substr[3]);
data = ip.GetAddressBytes();
break;
case DnsTransaction.QTYPE.MX:
MemoryStream stream = new MemoryStream();
string[] subsubstr = substr[3].Split(' ');
stream.Write(DnsTransaction.getLEBytes(ushort.Parse(subsubstr[0])), 0, 2);
stream.Write(DnsTransaction.getLabelBytes(subsubstr[1]), 0, subsubstr[1].Length);
data = stream.ToArray();
break;
}
yield return(new DnsTransaction.ResourceRecord(substr[0], qtype, DnsTransaction.RCLASS.IN, uint.Parse(substr[1]), data));
}
}
}
}
public void cache(object obj)
{
uint source = 0; // source nameserver id?
if (obj is DnsTransaction)
{
DnsTransaction t = obj as DnsTransaction;
// cache question too? they're in the resource records....
// there should be a table that indicates the question (request made, the time, the flags, the response code, etc)
foreach (DnsTransaction.ResourceRecord rr in t.getRecords())
{
cache(rr);
}
}
if (obj is DnsTransaction.ResourceRecord)
{
DnsTransaction.ResourceRecord record = obj as DnsTransaction.ResourceRecord;
uint qid = getDnsQueryId(record.question);
MySqlCommand sql = new MySqlCommand("SELECT id FROM records WHERE query=@query AND ttl > (now()-cached) ORDER BY cached DESC LIMIT 1", db);
sql.Parameters.AddWithValue("@query", qid);
sql.Prepare();
object r = sql.ExecuteScalar();
if (r == null)
{
// Not in cache, or expired
sql.CommandText = "INSERT INTO records (query,ttl,data,source) VALUES (@query,@ttl,@data,@source)";
sql.Parameters.AddWithValue("@ttl", record.ttl);
sql.Parameters.AddWithValue("@data", record.data);
if (source != 0)
{
sql.Parameters.AddWithValue("@source", source);
}
else
{
sql.Parameters.AddWithValue("@source", null);
}
sql.ExecuteNonQuery();
}
}
}
protected void onRecieve(IAsyncResult result)
{
int nBytesRec = tor.proxy.TcpClient.Client.EndReceive(result);
if (nBytesRec <= 0)
{
// tcp connection closing
this.tor.cleanup();
}
else
{
buffer.Write(chunk, 0, nBytesRec);
foreach (DnsTransaction answer in DnsTransaction.parseBuffer(buffer)) // cache all resourcerecords (answers/authoratative/additional)
{
callback(answer);
}
this.tor.proxy.TcpClient.Client.BeginReceive(chunk, 0, chunk.Length, SocketFlags.None, new AsyncCallback(onRecieve), this);
}
}
public DnsTask(DnsTransaction.QuestionRecord question)
{
this.resolver = new DnsTransaction(1, new DnsTransaction.DnsFlags(0x0100), question);
}
