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Skeleton of eventual pkvldtprod logic

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This commit is contained in:
Greg Edwards
2014-06-30 00:48:27 -04:00
parent 92d831abaf
commit 24a8518143
4 changed files with 135 additions and 21 deletions
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98
gts/pkvldtprod.ashx.cs
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@@ -2,6 +2,9 @@
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
using PkmnFoundations.Support;
using System.Text;
namespace PkmnFoundations.GTS
{
@@ -13,28 +16,81 @@ namespace PkmnFoundations.GTS
public void ProcessRequest(HttpContext context)
{
// todo...
byte[] requestData = new byte[(int)context.Request.InputStream.Length];
context.Request.InputStream.ReadBlock(requestData, 0, (int)context.Request.InputStream.Length);
// this is a mysterious token of unknown purpose. It seems to vary with the
// type of request being done.
// On GTS requests, it's 83 characters long and begins with NDS.
// In Random Matchup, it looks more like a base64 string, is 88 chars long
// and encodes 64 bytes of random looking data.
int tokenLength = Array.IndexOf<byte>(requestData, 0x00);
String token = StringHelper.BytesToString(requestData, 0, tokenLength, Encoding.UTF8);
int offset = tokenLength + 1;
RequestType type = (RequestType)BitConverter.ToInt16(requestData, offset);
offset += 2;
int pkmCount;
switch (type)
{
case RequestType.RandomMatchup:
case RequestType.GTS:
{
pkmCount = (requestData.Length - offset) / 220;
} break;
case RequestType.BattleSubway:
{
pkmCount = 6;
// todo: Need more info on this structure
} break;
default:
{
// Don't understand this request. Give it a response containing
// all 00s so stuff depending on it won't break.
// The game accepts a hash of all 00s and doesn't care what's contained
// in the response beyond its expected length so this will work.
// fixme: Once we start generating real signatures, they will prevent
// this from returning the necessary number of 00s in all cases.
pkmCount = 6;
} break;
}
context.Response.ContentType = "text/plain";
context.Response.OutputStream.Write(new byte[]{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, 0, 149);
context.Response.OutputStream.WriteByte((byte)PartyValidationResult.Valid); // success
for (int x = 0; x < pkmCount; x++)
{
context.Response.OutputStream.Write(BitConverter.GetBytes((int)PokemonValidationResult.Valid), 0, 4);
}
// placeholder for signature.
// Should be 128 bytes of an unknown hashing/signing algorithm
context.Response.OutputStream.Write(new byte[128], 0, 128);
}
private enum PartyValidationResult : byte
{
Valid = 0x00,
Invalid = 0x01
}
private enum PokemonValidationResult : int
{
Valid = 0x00000000,
Invalid = 0x3c000000
}
private enum RequestType : short
{
RandomMatchup = 0x0000,
GTS = 0x0100,
BattleSubway = 0x0400
}
private void Error400(HttpContext context)
{
context.Response.StatusCode = 400;
context.Response.ContentType = "text/plain";
context.Response.Write("Bad request");
}
public bool IsReusable

2
library/Library.csproj
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@@ -63,6 +63,8 @@
<Compile Include="Support\AssertHelper.cs" />
<Compile Include="Support\EncodedString4.cs" />
<Compile Include="Support\EncodedString5.cs" />
<Compile Include="Support\StreamExtender.cs" />
<Compile Include="Support\StringHelper.cs" />
</ItemGroup>
<ItemGroup />
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />

31
library/Support/StreamExtender.cs Normal file
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@@ -0,0 +1,31 @@
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace PkmnFoundations.Support
{
public static class StreamExtender
{
/// <summary>
/// Reads bytes from a stream and waits until it can read them all.
/// </summary>
/// <param name="s"></param>
/// <param name="buffer"></param>
/// <param name="offset"></param>
/// <param name="count"></param>
public static int ReadBlock(this Stream s, byte[] buffer, int offset, int count)
{
int readBytes = 0;
while (readBytes < count)
{
int x = s.Read(buffer, offset + readBytes, count - readBytes);
if (x == 0) return readBytes;
readBytes += x;
}
return readBytes;
}
}
}

25
library/Support/StringHelper.cs Normal file
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@@ -0,0 +1,25 @@
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace PkmnFoundations.Support
{
public static class StringHelper
{
public static String BytesToString(byte[] data, Encoding encoding)
{
MemoryStream ms = new MemoryStream(data);
StreamReader sr = new StreamReader(ms, encoding);
return sr.ReadToEnd();
}
public static String BytesToString(byte[] data, int start, int length, Encoding encoding)
{
MemoryStream ms = new MemoryStream(data, start, length);
StreamReader sr = new StreamReader(ms, encoding);
return sr.ReadToEnd();
}
}
}