public byte[] DownloadFileData(CacheIndex index, int fileId, CacheFileInfo fileInfo)
{
if (!fileInfo.Crc.HasValue)
{
throw new ArgumentException("File CRC must be set when requesting HTTP files.");
}
if (!fileInfo.Version.HasValue)
{
throw new ArgumentException("File version must be set when requesting HTTP files.");
}
if (!fileInfo.CompressedSize.HasValue)
{
throw new ArgumentException("File compressed size must be set when requesting HTTP files.");
}
var webRequest = WebRequest.CreateHttp(
$"https://{ClientDetails.GetContentServerHostname()}/ms?m=0&a={(int)index}&k={ClientDetails.GetBuildNumber().Item1}&g={fileId}&c={fileInfo.Crc}&v={fileInfo.Version}"
);
try
{
using var response = (HttpWebResponse)webRequest.GetResponse();
if (response.StatusCode != HttpStatusCode.OK)
{
throw new DownloaderException($"HTTP interface responded with status code: {response.StatusCode}.");
}
if (response.ContentLength != fileInfo.CompressedSize)
{
throw new DownloaderException($"Downloaded file size {response.ContentLength} does not match expected {fileInfo.CompressedSize}.");
}
var dataStream = new MemoryStream();
var dataWriter = new BinaryWriter(dataStream);
var responseReader = new BinaryReader(response.GetResponseStream());
dataWriter.Write(responseReader.ReadBytesExactly((int)response.ContentLength));
return(dataStream.ToArray());
}
catch (WebException exception)
{
throw new DownloaderException(
$"Could not download {(int)index}/{fileId} via HTTP due to a request error.",
exception
);
}
}
private void Connect()
{
if (this._connected)
{
throw new DownloaderException("Tried to connect while already connected.");
}
// Retry connecting with an increasing major version until the server no longer reports we're outdated
var currentBuildNumber = ClientDetails.HasBuildNumber()
? ClientDetails.GetBuildNumber()
: new Tuple <int, int>(TcpFileDownloader.StartBuildNumber, 1);
var connected = false;
while (!connected)
{
this._contentClient = new TcpClient(
ClientDetails.GetContentServerHostname(),
ClientDetails.GetContentServerTcpPort()
);
var handshakeWriter = new BinaryWriter(this._contentClient.GetStream());
var handshakeReader = new BinaryReader(this._contentClient.GetStream());
var handshakeKey = ClientDetails.GetContentServerTcpHandshakeKey();
Log.Debug($"Attempting to connect to TCP content server with version {currentBuildNumber.Item1}.{currentBuildNumber.Item2}...");
handshakeWriter.Write((byte)15); // Handshake type
handshakeWriter.Write((byte)(9 + handshakeKey.Length + 1)); // Handshake length (42)
handshakeWriter.WriteUInt32BigEndian((uint)currentBuildNumber.Item1);
handshakeWriter.WriteUInt32BigEndian((uint)currentBuildNumber.Item2);
handshakeWriter.WriteNullTerminatedString(handshakeKey);
handshakeWriter.Write((byte)Language.English);
handshakeWriter.Flush();
var response = (HandshakeResponse)handshakeReader.ReadByte();
switch (response)
{
case HandshakeResponse.Success:
connected = true;
// Make build number globally available.
ClientDetails.SetBuildNumber(currentBuildNumber);
break;
case HandshakeResponse.Outdated:
this._contentClient.Dispose();
this._contentClient = null;
currentBuildNumber = new Tuple <int, int>(currentBuildNumber.Item1 + 1, 1);
break;
default:
this._contentClient.Dispose();
this._contentClient = null;
throw new DownloaderException($"Content server responded to handshake with {response}.");
}
}
Log.Debug($"Successfully connected to content server with version {currentBuildNumber.Item1}.{currentBuildNumber.Item2}.");
var contentReader = new BinaryReader(this._contentClient.GetStream());
// Loading requirements. Whatever that might mean:
// 00 00 0c ea
// 00 01 10 a3
// 00 00 a2 b3
// 00 00 8c 1a
// 00 05 79 3c
// 00 42 d4 96
// 00 00 ad 57
// 00 00 47 3f
// 00 01 0b 50
// 00 06 b6 55 00 13 dd 79 00 0a 1f cf 00 0a b2 93 00 13 d9 2a 00 15 dd e7 00 00 a4 3c 00 14 10 50 00 00 5a e3 00 00 97 75 00 00 04 dc 00 01 70 0d 00 00 09 20 00 00 00 77 00 13 73 f2 00 51 66 05 00 00 ab ee 00 00 61 ba 00 02 2d 43
var loadingRequirements = contentReader.ReadBytesExactly(28 * 4);
// Send the initial connection status and login packets to the server. I don't know what the individual
// writes mean but they do the trick.
Log.Debug("Sending initial connection status and login packets...");
var contentWriter = new BinaryWriter(this._contentClient.GetStream());
const int unknownTribyte1 = 0x000005;
const ushort unknownShort1 = 0x0000;
const ushort unknownShort2 = 0x0000; // Observed to be different and is used in every file request.
contentWriter.Write((byte)0x06);
contentWriter.WriteUInt24BigEndian(unknownTribyte1);
contentWriter.WriteUInt16BigEndian(unknownShort1);
contentWriter.WriteUInt16BigEndian((ushort)currentBuildNumber.Item1);
contentWriter.WriteUInt16BigEndian(unknownShort2);
contentWriter.Flush();
contentWriter.Write((byte)0x03);
contentWriter.WriteUInt24BigEndian(unknownTribyte1);
contentWriter.WriteUInt16BigEndian(unknownShort1);
contentWriter.WriteUInt16BigEndian((ushort)currentBuildNumber.Item1);
contentWriter.WriteUInt16BigEndian(unknownShort2);
contentWriter.Flush();
this._connected = true;
}