public override DnsDatagram Query(DnsDatagram request)
{
//serialize request
byte[] requestBuffer;
using (MemoryStream mS = new MemoryStream(32))
{
request.WriteTo(mS);
requestBuffer = mS.ToArray();
}
//DoH wire format request
DateTime sentAt = DateTime.UtcNow;
byte[] responseBuffer;
using (WebClientEx wC = new WebClientEx())
{
wC.AddHeader("content-type", "application/dns-message");
wC.AddHeader("accept", "application/dns-message");
wC.AddHeader("host", _server.DnsOverHttpEndPoint.Host + ":" + _server.DnsOverHttpEndPoint.Port);
wC.UserAgent = "DoH client";
wC.Proxy = _proxy;
wC.Timeout = _timeout;
if (_proxy == null)
{
if (_server.IPEndPoint == null)
{
_server.RecursiveResolveIPAddress();
}
responseBuffer = wC.UploadData(new Uri(_server.DnsOverHttpEndPoint.Scheme + "://" + _server.IPEndPoint.ToString() + _server.DnsOverHttpEndPoint.PathAndQuery), requestBuffer);
}
else
{
responseBuffer = wC.UploadData(_server.DnsOverHttpEndPoint, requestBuffer);
}
}
//parse response
using (MemoryStream mS = new MemoryStream(responseBuffer, false))
{
DnsDatagram response = new DnsDatagram(mS);
response.SetMetadata(new DnsDatagramMetadata(_server, _protocol, responseBuffer.Length, (DateTime.UtcNow - sentAt).TotalMilliseconds));
if (response.Header.Identifier == request.Header.Identifier)
{
return(response);
}
}
return(null);
}
public override DnsDatagram Query(DnsDatagram request)
{
//DoH JSON format request
DateTime sentAt = DateTime.UtcNow;
byte[] responseBuffer;
using (WebClientEx wC = new WebClientEx())
{
wC.AddHeader("accept", "application/dns-json");
wC.AddHeader("host", _server.DnsOverHttpEndPoint.Host + ":" + _server.DnsOverHttpEndPoint.Port);
wC.UserAgent = "DoH client";
wC.Proxy = _proxy;
wC.Timeout = _timeout;
Uri queryUri;
if (_proxy == null)
{
if (_server.IPEndPoint == null)
{
_server.RecursiveResolveIPAddress(new SimpleDnsCache());
}
queryUri = new Uri(_server.DnsOverHttpEndPoint.Scheme + "://" + _server.IPEndPoint.ToString() + _server.DnsOverHttpEndPoint.PathAndQuery);
}
else
{
queryUri = _server.DnsOverHttpEndPoint;
}
wC.QueryString.Clear();
wC.QueryString.Add("name", request.Question[0].Name);
wC.QueryString.Add("type", Convert.ToString(((int)request.Question[0].Type)));
responseBuffer = wC.DownloadData(queryUri);
}
//parse response
dynamic jsonResponse = JsonConvert.DeserializeObject(Encoding.ASCII.GetString(responseBuffer));
DnsDatagram response = new DnsDatagram(jsonResponse);
response.SetMetadata(new DnsDatagramMetadata(_server, _protocol, responseBuffer.Length, (DateTime.UtcNow - sentAt).TotalMilliseconds));
return(response);
}
protected override void UpdateTracker(TrackerClientEvent @event, IPEndPoint clientEP)
{
string queryString;
queryString = "?info_hash=" + Uri.EscapeDataString(Encoding.ASCII.GetString(_infoHash)) +
"&peer_id=" + Uri.EscapeDataString(Encoding.ASCII.GetString(_clientID.PeerID));
switch (clientEP.Address.ToString())
{
case "0.0.0.0":
case "127.0.0.1":
case "::":
case "::1":
break;
default:
if (clientEP.Address.AddressFamily == System.Net.Sockets.AddressFamily.InterNetworkV6)
{
queryString += "&ipv6=" + clientEP.Address.ToString();
}
else
{
queryString += "&ip=" + clientEP.Address.ToString();
}
break;
}
queryString += "&port=" + clientEP.Port +
"&uploaded=0&downloaded=0&left=0&corrupt=0" +
"&key=" + BitConverter.ToString(_clientID.ClientKey).Replace("-", "");
switch (@event)
{
case TrackerClientEvent.Started:
queryString += "&event=started";
break;
case TrackerClientEvent.Stopped:
queryString += "&event=stopped";
break;
case TrackerClientEvent.Completed:
queryString += "&event=completed";
break;
}
queryString += "&numwant=" + _clientID.NumWant;
if (_clientID.Compact)
{
queryString += "&compact=1";
}
else
{
queryString += "&compact=0";
}
if (_clientID.NoPeerID)
{
queryString += "&no_peer_id=1";
}
using (WebClientEx webClient = new WebClientEx())
{
webClient.Proxy = _proxy;
webClient.Timeout = 30000; //30 sec timeout
webClient.UserAgent = _clientID.HttpUserAgent;
webClient.AddHeader("Accept-Encoding", _clientID.HttpAcceptEncoding);
webClient.KeepAlive = false;
using (Stream responseStream = webClient.OpenRead(_trackerURI.AbsoluteUri + queryString))
{
switch (@event)
{
case TrackerClientEvent.None:
case TrackerClientEvent.Started:
Bencoding x = Bencoding.Decode(responseStream);
switch (x.Type)
{
case BencodingType.Dictionary:
_peers.Clear();
foreach (var item in x.ValueDictionary)
{
switch (item.Key)
{
case "peers":
switch (item.Value.Type)
{
case BencodingType.String:
ParseCompactPeersIPv4(item.Value.Value as byte[], _peers);
break;
case BencodingType.List:
foreach (var peerObj in item.Value.ValueList)
{
var peer = peerObj.ValueDictionary;
_peers.Add(new IPEndPoint(IPAddress.Parse(peer["ip"].ValueString), Convert.ToInt32(peer["port"].ValueInteger)));
}
break;
}
break;
case "peers_ipv6":
case "peers6":
switch (item.Value.Type)
{
case BencodingType.String:
ParseCompactPeersIPv6(item.Value.Value as byte[], _peers);
break;
}
break;
case "interval":
if (item.Value.Type == BencodingType.Integer)
{
_interval = Convert.ToInt32(item.Value.Value);
}
break;
case "min interval":
if (item.Value.Type == BencodingType.Integer)
{
_minInterval = Convert.ToInt32(item.Value.Value);
}
break;
}
}
break;
default:
throw new TrackerClientException("Invalid data received from tracker. Expected bencoded dictionary.");
}
break;
}
}
}
}