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Added support for early gamestats servers with very little validation.

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This commit is contained in:
Greg Edwards 2014-09-12 23:26:35 -04:00
parent 63a13037bb
commit 370dd2f76b
1 changed files with 31 additions and 7 deletions
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38
GamestatsBase/GamestatsHandler.cs
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@ -103,15 +103,15 @@ namespace GamestatsBase
if (form["hash"] == null ||
form["data"] == null ||
form["data"].Length <
((RequestVersion == GamestatsRequestVersions.Version1) ? 12 : 16))
((RequestVersion != GamestatsRequestVersions.Version3) ? 12 : 16))
{
// arguments missing, partial check for data length.
// In version 1, we require data to hold at least 7 bytes
// In version 1-2, we require data to hold at least 7 bytes
// in this check. In reality, it must hold at least 8,
// which is checked for below after decoding
// In version 2, we require data to hold at least 10 bytes
// In version 3, we require data to hold at least 10 bytes
// in this check, but it actually needs to hold 12.
// We do incomplete checks so we can fail as early as
@ -145,7 +145,7 @@ namespace GamestatsBase
try
{
data = DecryptData(form["data"]);
if (data.Length < ((RequestVersion == GamestatsRequestVersions.Version1)
if (data.Length < ((RequestVersion != GamestatsRequestVersions.Version3)
? 4 : 8))
{
// data too short to contain a pid
@ -173,7 +173,7 @@ namespace GamestatsBase
return;
}
if (RequestVersion != GamestatsRequestVersions.Version1)
if (RequestVersion == GamestatsRequestVersions.Version3)
{
int length = BitConverter.ToInt32(data, 4);
if (length + 8 != data.Length)
@ -184,7 +184,7 @@ namespace GamestatsBase
}
}
int trimLength = (RequestVersion == GamestatsRequestVersions.Version1) ? 4 : 8;
int trimLength = (RequestVersion != GamestatsRequestVersions.Version3) ? 4 : 8;
byte[] dataTrim = new byte[data.Length - trimLength];
Array.Copy(data, trimLength, dataTrim, 0, data.Length - trimLength);
@ -266,6 +266,8 @@ namespace GamestatsBase
byte[] data2 = FromUrlSafeBase64String(data);
if (data2.Length < 4) throw new FormatException("Data must contain at least 4 bytes.");
if (RequestVersion == GamestatsRequestVersions.Version1) return data2;
byte[] data3 = new byte[data2.Length - 4];
int checksum = BitConverter.ToInt32(data2, 0);
checksum = IPAddress.NetworkToHostOrder(checksum); // endian flip
@ -327,14 +329,36 @@ namespace GamestatsBase
public enum GamestatsRequestVersions
{
/// <summary>
/// Version 1 has very little validation. Request data doesn't contain
/// any of the headers found in later versions and is unencrypted.
/// </summary>
Version1,
Version2
/// <summary>
/// Data contains an obfuscated checksum and pid, and supports
/// enryption.
/// </summary>
Version2,
/// <summary>
/// Data contains an obfuscated checksum, pid, and payload length, and
/// supports encryption.
/// </summary>
Version3
}
public enum GamestatsResponseVersions
{
/// <summary>
/// Response is plain raw binary data.
/// </summary>
Version1,
/// <summary>
/// Response contains a salted hash at the end, encoded in hex.
/// </summary>
Version2,
/// <summary>
/// Response contains the word "done" followed by the salted hash.
/// </summary>
Version3
}