6f5afe3eba
* Fixes in BuildPacket for typecasting * 255 character limit fix in BuildPacket git-svn-id: http://libopenmetaverse.googlecode.com/svn/trunk@48 52acb1d6-8a22-11de-b505-999d5b087335
840 lines
23 KiB
C#
840 lines
23 KiB
C#
/*
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* Copyright (c) 2006, Second Life Reverse Engineering Team
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* All rights reserved.
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*
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* - Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* - Neither the name of the Second Life Reverse Engineering Team nor the names
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* of its contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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using System;
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using System.Net;
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using System.Collections;
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namespace libsecondlife
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{
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public struct Field
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{
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public object Data;
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public MapField Layout;
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public override string ToString()
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{
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string output = "";
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if (Layout.Type == FieldType.Variable || Layout.Type == FieldType.Fixed)
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{
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bool printable = true;
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byte[] byteArray = (byte[])Data;
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for (int i = 0; i < byteArray.Length; ++i)
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{
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// Check if there are any unprintable characters in the array
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if ((byteArray[i] < 0x20 || byteArray[i] > 0x7E) && byteArray[i] != 0x09
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&& byteArray[i] != 0x0D)
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{
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printable = false;
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}
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}
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if (printable)
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{
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output += System.Text.Encoding.ASCII.GetChars(byteArray, 0, byteArray.Length);
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output.Replace("\0", "");
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}
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else
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{
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for (int i = 0; i < byteArray.Length; i += 16)
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{
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output += Layout.Name + ": ";
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for (int j = 0; j < 16; j++)
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{
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if ((i + j) < byteArray.Length)
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{
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output += String.Format("{0:X} ", byteArray[i + j]);
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}
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else
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{
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output += " ";
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}
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}
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for (int j = 0; j < 16 && (i + j) < byteArray.Length; j++)
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{
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if (byteArray[i + j] >= 0x20 && byteArray[i + j] < 0x7E)
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{
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output += (char)byteArray[i + j];
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}
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else
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{
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output += ".";
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}
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}
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output += "\n";
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}
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}
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}
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else
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{
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output += Layout.Name + ": " + Data.ToString();
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}
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return output;
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}
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}
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public struct Block
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{
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public ArrayList Fields;
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public MapBlock Layout;
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}
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public class Packet
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{
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public byte[] Data;
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public MapPacket Layout;
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public ushort Sequence
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{
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get
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{
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// The sequence number is the third and fourth bytes of the packet, stored
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// in network order
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return (ushort)(Data[2] * 256 + Data[3]);
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}
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set
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{
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Data[2] = (byte)(value / 256);
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Data[3] = (byte)(value % 256);
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}
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}
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private ProtocolManager Protocol;
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public Packet(string command, ProtocolManager protocol, int length)
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{
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Protocol = protocol;
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Data = new byte[length];
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Layout = protocol.Command(command);
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if (Layout == null)
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{
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Helpers.Log("Attempting to build a packet with invalid command \"" + command + "\"",
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Helpers.LogLevel.Error);
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}
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switch (Layout.Frequency)
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{
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case PacketFrequency.Low:
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// Set the low frequency identifier bits
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byte[] lowHeader = {0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF};
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Array.Copy(lowHeader, 0, Data, 0, 6);
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// Store the packet ID in network order
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Data[6] = (byte)(Layout.ID / 256);
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Data[7] = (byte)(Layout.ID % 256);
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break;
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case PacketFrequency.Medium:
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// Set the medium frequency identifier bit
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byte[] mediumHeader = {0x00, 0x00, 0x00, 0x00, 0xFF};
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Array.Copy(mediumHeader, 0, Data, 0, 5);
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Data[5] = (byte)Layout.ID;
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break;
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case PacketFrequency.High:
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byte[] highHeader = {0x00, 0x00, 0x00, 0x00};
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Array.Copy(highHeader, 0, Data, 0, 4);
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Data[4] = (byte)Layout.ID;
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break;
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}
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}
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public Packet(byte[] data, int length, ProtocolManager protocol)
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{
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Protocol = protocol;
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ushort command;
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Data = new byte[length];
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if (length < 5)
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{
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Helpers.Log("Received a packet with less than 5 bytes", Helpers.LogLevel.Warning);
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// Create an empty MapPacket
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Layout = new MapPacket();
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Layout.Blocks = new ArrayList();
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return;
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}
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if (data[4] == 0xFF)
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{
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if ((byte)data[5] == 0xFF)
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{
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// Low frequency
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command = (ushort)(data[6] * 256 + data[7]);
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Layout = protocol.Command(command, PacketFrequency.Low);
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}
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else
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{
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// Medium frequency
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command = (ushort)data[5];
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Layout = protocol.Command(command, PacketFrequency.Medium);
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}
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}
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else
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{
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// High frequency
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command = (ushort)data[4];
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Layout = protocol.Command(command, PacketFrequency.High);
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}
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if (Layout == null)
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{
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Helpers.Log("Received a packet with an unknown command ID", Helpers.LogLevel.Warning);
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// Create an empty MapPacket
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Layout = new MapPacket();
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Layout.Blocks = new ArrayList();
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}
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// Copy the network byte array to this packet's byte array
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Array.Copy(data, 0, Data, 0, length);
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}
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public ArrayList Blocks()
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{
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Field field;
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Block block;
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byte blockCount;
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int fieldSize;
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// Get the starting position of the SL payload (different than the UDP payload)
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int pos = HeaderLength();
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// Initialize the block list we are returning
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ArrayList blocks = new ArrayList();
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foreach (MapBlock blockMap in Layout.Blocks)
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{
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if (blockMap.Count == -1)
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{
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// Variable count block
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if (pos < Data.Length)
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{
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blockCount = Data[pos];
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pos++;
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}
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else
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{
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Helpers.Log("getBlocks(): goto 1 reached", Helpers.LogLevel.Warning);
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goto Done;
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}
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}
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else
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{
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blockCount = (byte)blockMap.Count;
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}
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for (int i = 0; i < blockCount; ++i)
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{
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// Create a new block to push back on the list
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block = new Block();
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block.Layout = blockMap;
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block.Fields = new ArrayList();
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foreach (MapField fieldMap in blockMap.Fields)
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{
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if (fieldMap.Type == FieldType.Variable)
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{
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if (fieldMap.Count == 1)
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{
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// Field length described with one byte
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if (pos < Data.Length)
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{
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fieldSize = (ushort)Data[pos];
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pos++;
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}
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else
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{
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Helpers.Log("getBlocks(): goto 2 reached", Helpers.LogLevel.Warning);
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goto BlockDone;
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}
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}
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else // (fieldMap.Count == 2)
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{
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// Field length described with two bytes
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if (pos + 1 < Data.Length)
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{
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fieldSize = (ushort)(Data[pos] + Data[pos + 1] * 256);
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pos += 2;
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}
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else
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{
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Helpers.Log("getBlocks(): goto 3 reached", Helpers.LogLevel.Warning);
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goto BlockDone;
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}
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}
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if (fieldSize != 0)
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{
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if (pos + fieldSize <= Data.Length)
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{
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// Create a new field to add to the fields for this block
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field = new Field();
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field.Data = GetField(Data, pos, fieldMap.Type, fieldSize);
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field.Layout = fieldMap;
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block.Fields.Add(field);
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pos += fieldSize;
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}
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else
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{
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Helpers.Log("getBlocks(): goto 4 reached", Helpers.LogLevel.Warning);
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goto BlockDone;
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}
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}
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}
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else if (fieldMap.Type == FieldType.Fixed)
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{
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fieldSize = fieldMap.Count;
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if (pos + fieldSize <= Data.Length)
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{
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// Create a new field to add to the fields for this block
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field = new Field();
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field.Data = GetField(Data, pos, fieldMap.Type, fieldSize);
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field.Layout = fieldMap;
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block.Fields.Add(field);
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pos += fieldSize;
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}
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else
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{
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Helpers.Log("getBlocks(): goto 4 reached", Helpers.LogLevel.Warning);
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goto BlockDone;
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}
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}
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else
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{
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for (int j = 0; j < fieldMap.Count; ++j)
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{
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fieldSize = (int)Protocol.TypeSizes[fieldMap.Type];
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if (pos + fieldSize <= Data.Length)
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{
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// Create a new field to add to the fields for this block
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field = new Field();
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field.Data = GetField(Data, pos, fieldMap.Type, fieldSize);
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field.Layout = fieldMap;
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block.Fields.Add(field);
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pos += fieldSize;
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}
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else
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{
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Helpers.Log("getBlocks(): goto 5 reached", Helpers.LogLevel.Warning);
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goto BlockDone;
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}
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}
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}
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}
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BlockDone:
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blocks.Add(block);
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}
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}
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Done:
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return blocks;
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}
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public object Field(string name)
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{
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foreach (Block block in Blocks())
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{
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foreach (Field field in block.Fields)
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{
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if (field.Layout.Name == name)
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{
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return field.Data;
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}
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}
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}
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return null;
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}
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public override string ToString()
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{
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string output = "";
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ArrayList blocks = Blocks();
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output += "---- " + Layout.Name + " ----\n";
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foreach (Block block in blocks)
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{
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output += "-- " + block.Layout.Name + " --\n";
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foreach (Field field in block.Fields)
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{
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output += field.ToString() + "\n";
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}
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}
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return output;
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}
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private object GetField(byte[] byteArray, int pos, FieldType type, int fieldSize)
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{
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switch (type)
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{
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case FieldType.U8:
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return byteArray[pos];
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case FieldType.U16:
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case FieldType.IPPORT:
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return (ushort)(byteArray[pos] + (byteArray[pos + 1] << 8));
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case FieldType.U32:
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return (uint)(byteArray[pos] + (byteArray[pos + 1] << 8) +
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(byteArray[pos + 2] << 16) + (byteArray[pos + 3] << 24));
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case FieldType.U64:
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return new U64(byteArray, pos);
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case FieldType.S8:
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return (sbyte)byteArray[pos];
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case FieldType.S16:
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return (short)(byteArray[pos] + (byteArray[pos + 1] << 8));
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case FieldType.S32:
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return byteArray[pos] + (byteArray[pos + 1] << 8) +
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(byteArray[pos + 2] << 16) + (byteArray[pos + 3] << 24);
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case FieldType.S64:
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return (long)(byteArray[pos] + (byteArray[pos + 1] << 8) +
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(byteArray[pos + 2] << 16) + (byteArray[pos + 3] << 24) +
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(byteArray[pos + 4] << 32) + (byteArray[pos + 5] << 40) +
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(byteArray[pos + 6] << 48) + (byteArray[pos + 7] << 56));
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case FieldType.F32:
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return BitConverter.ToSingle(byteArray, pos); // FIXME
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case FieldType.F64:
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return BitConverter.ToDouble(byteArray, pos); // FIXME
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case FieldType.LLUUID:
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return new LLUUID(byteArray, pos);
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case FieldType.BOOL:
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return (byteArray[pos] != 0) ? (bool)true : (bool)false;
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case FieldType.LLVector3:
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return new LLVector3(byteArray, pos);
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case FieldType.LLVector3d:
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return new LLVector3d(byteArray, pos);
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case FieldType.LLVector4:
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return new LLVector4(byteArray, pos);
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case FieldType.LLQuaternion:
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return new LLQuaternion(byteArray, pos);
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case FieldType.IPADDR:
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uint address = (uint)(byteArray[pos] + (byteArray[pos + 1] << 8) +
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(byteArray[pos + 2] << 16) + (byteArray[pos + 3] << 24));
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return new IPAddress(address);
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case FieldType.Variable:
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case FieldType.Fixed:
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byte[] bytes = new byte[fieldSize];
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Array.Copy(byteArray, pos, bytes, 0, fieldSize);
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return bytes;
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}
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return null;
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}
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public int HeaderLength()
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{
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switch (Layout.Frequency)
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{
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case PacketFrequency.High:
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return 5;
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case PacketFrequency.Medium:
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return 6;
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case PacketFrequency.Low:
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return 8;
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}
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return 0;
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}
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}
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public class PacketBuilder
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{
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public static Packet BuildPacket(string name, ProtocolManager protocol, Hashtable blocks, byte flags)
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{
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Hashtable fields;
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ArrayList payload = new ArrayList();
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byte[] byteArray = new byte[1024];
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int length = 0;
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int blockCount = 0;
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int fieldLength = 0;
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IDictionaryEnumerator blocksEnum;
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MapPacket packetMap = protocol.Command(name);
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// Build the header
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#region Header
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switch (packetMap.Frequency)
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{
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case PacketFrequency.High:
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byteArray[4] = (byte)packetMap.ID;
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length = 5;
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break;
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case PacketFrequency.Medium:
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byteArray[4] = 0xFF;
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byteArray[5] = (byte)packetMap.ID;
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length = 6;
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break;
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case PacketFrequency.Low:
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byteArray[4] = 0xFF;
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byteArray[5] = 0xFF;
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byteArray[6] = (byte)(packetMap.ID / 256);
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byteArray[7] = (byte)(packetMap.ID % 256);
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length = 8;
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break;
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}
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#endregion Header
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foreach (MapBlock blockMap in packetMap.Blocks)
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{
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// If this is a variable count block, count the number of appearances of this block in the
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// passed in Hashtable and prepend a counter byte
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#region VariableSize
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if (blockMap.Count == -1)
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{
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blockCount = 0;
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// Count the number of this type of block in the blocks Hashtable
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blocksEnum = blocks.GetEnumerator();
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while (blocksEnum.MoveNext())
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{
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if ((string)blocksEnum.Value == blockMap.Name)
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{
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blockCount++;
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}
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}
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if (blockCount > 255)
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{
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Helpers.Log("Trying to put more than 255 blocks in a variable block position, " +
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"this will not end well", Helpers.LogLevel.Error);
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}
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// Prepend the blocks with a count
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byteArray[length] = (byte)blockCount;
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length++;
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}
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#endregion VariableSize
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// Reset blockCount
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blockCount = 0;
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// Check for blocks of this type in the Hashtable
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#region BuildBlock
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blocksEnum = blocks.GetEnumerator();
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while (blocksEnum.MoveNext())
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{
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if ((string)blocksEnum.Value == blockMap.Name)
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{
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// Found a match of this block
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if (blockMap.Count == -1 || blockCount < blockMap.Count)
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{
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blockCount++;
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#region TryBlockTypecast
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try
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{
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fields = (Hashtable)blocksEnum.Key;
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}
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catch (Exception)
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{
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Helpers.Log("Something other than a field Hashtable was passed to BuildPacket " +
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"inside of the block Hashtable", Helpers.LogLevel.Warning);
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continue;
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}
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#endregion TryBlockTypecast
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foreach (MapField fieldMap in blockMap.Fields)
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{
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if (fields.ContainsKey(fieldMap.Name))
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{
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object field = fields[fieldMap.Name];
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|
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#region AddField
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try
|
|
{
|
|
switch (fieldMap.Type)
|
|
{
|
|
case FieldType.U8:
|
|
byteArray[length++] = (byte)field;
|
|
break;
|
|
case FieldType.U16:
|
|
case FieldType.IPPORT:
|
|
ushort fieldUShort = (ushort)field;
|
|
byteArray[length++] = (byte)(fieldUShort % 256);
|
|
fieldUShort >>= 8;
|
|
byteArray[length++] = (byte)(fieldUShort % 256);
|
|
break;
|
|
case FieldType.U32:
|
|
uint fieldUInt = (uint)field;
|
|
byteArray[length++] = (byte)(fieldUInt % 256);
|
|
fieldUInt >>= 8;
|
|
byteArray[length++] = (byte)(fieldUInt % 256);
|
|
fieldUInt >>= 8;
|
|
byteArray[length++] = (byte)(fieldUInt % 256);
|
|
fieldUInt >>= 8;
|
|
byteArray[length++] = (byte)(fieldUInt % 256);
|
|
break;
|
|
case FieldType.U64:
|
|
// FIXME: Apply endianness patch
|
|
Array.Copy(((U64)field).GetBytes(), 0, byteArray, length, 8);
|
|
length += 8;
|
|
break;
|
|
case FieldType.S8:
|
|
byteArray[length++] = (byte)((sbyte)field);
|
|
break;
|
|
case FieldType.S16:
|
|
// FIXME: Apply endianness patch
|
|
Array.Copy(BitConverter.GetBytes((short)field), 0, byteArray, length, 2);
|
|
length += 2;
|
|
break;
|
|
case FieldType.S32:
|
|
// FIXME: Apply endianness patch
|
|
Array.Copy(BitConverter.GetBytes((int)field), 0, byteArray, length, 4);
|
|
length += 4;
|
|
break;
|
|
case FieldType.S64:
|
|
// FIXME: Apply endianness patch
|
|
Array.Copy(BitConverter.GetBytes((long)field), 0, byteArray, length, 8);
|
|
length += 8;
|
|
break;
|
|
case FieldType.F32:
|
|
Array.Copy(BitConverter.GetBytes((float)field), 0, byteArray, length, 4);
|
|
length += 4;
|
|
break;
|
|
case FieldType.F64:
|
|
Array.Copy(BitConverter.GetBytes((double)field), 0, byteArray, length, 8);
|
|
length += 8;
|
|
break;
|
|
case FieldType.LLUUID:
|
|
Array.Copy(((LLUUID)field).Data, 0, byteArray, length, 16);
|
|
length += 16;
|
|
break;
|
|
case FieldType.BOOL:
|
|
byteArray[length] = (byte)((bool)field == true ? 1 : 0);
|
|
length++;
|
|
break;
|
|
case FieldType.LLVector3:
|
|
Array.Copy(((LLVector3)field).GetBytes(), 0, byteArray, length, 12);
|
|
length += 12;
|
|
break;
|
|
case FieldType.LLVector3d:
|
|
Array.Copy(((LLVector3d)field).GetBytes(), 0, byteArray, length, 24);
|
|
length += 24;
|
|
break;
|
|
case FieldType.LLVector4:
|
|
Array.Copy(((LLVector4)field).GetBytes(), 0, byteArray, length, 16);
|
|
length += 16;
|
|
break;
|
|
case FieldType.LLQuaternion:
|
|
Array.Copy(((LLQuaternion)field).GetBytes(), 0, byteArray, length, 16);
|
|
length += 16;
|
|
break;
|
|
case FieldType.IPADDR:
|
|
Array.Copy(BitConverter.GetBytes((ushort)field), 0, byteArray, length, 2);
|
|
length += 2;
|
|
break;
|
|
case FieldType.Variable:
|
|
if (fieldMap.Count == 1)
|
|
{
|
|
if (fieldLength > 255)
|
|
{
|
|
Helpers.Log("Truncating variable (byte) field to 255 " +
|
|
"characters", Helpers.LogLevel.Warning);
|
|
|
|
fieldLength = 255;
|
|
}
|
|
}
|
|
else if (fieldMap.Count == 2)
|
|
{
|
|
if (fieldLength > 1024)
|
|
{
|
|
Helpers.Log("Truncating variable (byte) field to 1024 " +
|
|
"characters", Helpers.LogLevel.Warning);
|
|
|
|
fieldLength = 1024;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
Helpers.Log("Variable field with an unknown count", Helpers.LogLevel.Warning);
|
|
}
|
|
|
|
if (field.GetType().IsArray)
|
|
{
|
|
// Assume this is a byte array
|
|
fieldLength = ((byte[])field).Length;
|
|
}
|
|
else
|
|
{
|
|
// Assume this is a string, add 1 for the null terminator
|
|
fieldLength = ((string)field).Length + 1;
|
|
}
|
|
|
|
if (fieldMap.Count == 2)
|
|
{
|
|
Array.Copy(BitConverter.GetBytes(fieldLength), 0, byteArray,
|
|
length, 2);
|
|
length += 2;
|
|
}
|
|
else
|
|
{
|
|
if (fieldMap.Count != 1)
|
|
{
|
|
Helpers.Log("Variable field " + fieldMap.Name + " has a count of " +
|
|
+ fieldMap.Count + ", ignoring and assuming 1",
|
|
Helpers.LogLevel.Warning);
|
|
}
|
|
|
|
byteArray[length] = (byte)(fieldLength);
|
|
length++;
|
|
}
|
|
|
|
if (field.GetType().IsArray)
|
|
{
|
|
// Assume this is a byte array
|
|
Array.Copy((byte[])field, 0, byteArray, length, fieldLength);
|
|
}
|
|
else
|
|
{
|
|
// Assume this is a string, add 1 for the null terminator
|
|
byte[] stringBytes = System.Text.Encoding.UTF8.GetBytes((string)field);
|
|
Array.Copy(stringBytes, 0, byteArray, length, stringBytes.Length);
|
|
fieldLength = stringBytes.Length + 1;
|
|
}
|
|
|
|
length += fieldLength;
|
|
|
|
break;
|
|
case FieldType.Fixed:
|
|
Array.Copy((byte[])field, 0, byteArray, length, fieldMap.Count);
|
|
length += fieldMap.Count;
|
|
break;
|
|
default:
|
|
Helpers.Log("Unhandled field type " + fieldMap.Type + " during " +
|
|
"packet construction", Helpers.LogLevel.Error);
|
|
break;
|
|
}
|
|
}
|
|
catch (Exception)
|
|
{
|
|
Helpers.Log("Data type " + field.GetType().ToString() + " for field " +
|
|
fieldMap.Name + " doesn't match expected type " + fieldMap.Type.ToString(),
|
|
Helpers.LogLevel.Error);
|
|
// This will fail for fixed or variable type packets, but it's a
|
|
// last ditch effort
|
|
length += (int)protocol.TypeSizes[fieldMap.Type];
|
|
}
|
|
#endregion AddField
|
|
}
|
|
else
|
|
{
|
|
// This field wasn't passed in, create an empty version
|
|
#region EmptyField
|
|
if (fieldMap.Type == FieldType.Variable)
|
|
{
|
|
// Just set the counter to zero and move on
|
|
if (fieldMap.Count == 2)
|
|
{
|
|
length += 2;
|
|
}
|
|
else
|
|
{
|
|
if (fieldMap.Count != 1)
|
|
{
|
|
Helpers.Log("Variable field " + fieldMap.Name + " has a count of " +
|
|
+ fieldMap.Count + ", ignoring and assuming 1",
|
|
Helpers.LogLevel.Warning);
|
|
}
|
|
|
|
length++;
|
|
}
|
|
}
|
|
else if (fieldMap.Type == FieldType.Fixed)
|
|
{
|
|
length += fieldMap.Count;
|
|
}
|
|
else
|
|
{
|
|
length += (int)protocol.TypeSizes[fieldMap.Type];
|
|
}
|
|
#endregion EmptyField
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
Helpers.Log("Trying to build a " + packetMap.Name + " packet with too many " +
|
|
blockMap.Name + " blocks", Helpers.LogLevel.Warning);
|
|
}
|
|
}
|
|
}
|
|
#endregion BuildBlock
|
|
|
|
// If this is a fixed count block and it doesn't appear in the Hashtable passed in, create
|
|
// empty filler blocks
|
|
#region EmptyBlock
|
|
if (blockCount == 0 && blockMap.Count != -1)
|
|
{
|
|
for (int i = 0; i < blockMap.Count; ++i)
|
|
{
|
|
foreach (MapField field in blockMap.Fields)
|
|
{
|
|
if (field.Type == FieldType.Variable)
|
|
{
|
|
length++;
|
|
}
|
|
else
|
|
{
|
|
length += (int)protocol.TypeSizes[field.Type];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#endregion EmptyBlock
|
|
}
|
|
|
|
Packet packet = new Packet(byteArray, length, protocol);
|
|
packet.Data[0] = flags;
|
|
return packet;
|
|
}
|
|
}
|
|
}
|