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2021-03-30 21:07:35 +02:00
parent 4acc5675d6
commit 813643036b
817 changed files with 16 additions and 0 deletions
--- a/src/main/java/net/mina/MaplePacketDecoder.java
+++ b/src/main/java/net/mina/MaplePacketDecoder.java
@@ -0,0 +1,105 @@
+/*
+	This file is part of the OdinMS Maple Story Server
+    Copyright (C) 2008 Patrick Huy <patrick.huy@frz.cc>
+		       Matthias Butz <matze@odinms.de>
+		       Jan Christian Meyer <vimes@odinms.de>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as
+    published by the Free Software Foundation version 3 as published by
+    the Free Software Foundation. You may not use, modify or distribute
+    this program under any other version of the GNU Affero General Public
+    License.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+package net.mina;
+
+import config.YamlConfig;
+import client.MapleClient;
+import constants.net.OpcodeConstants;
+import net.server.coordinator.session.MapleSessionCoordinator;
+import org.apache.mina.core.buffer.IoBuffer;
+import org.apache.mina.core.session.IoSession;
+import org.apache.mina.filter.codec.CumulativeProtocolDecoder;
+import org.apache.mina.filter.codec.ProtocolDecoderOutput;
+import tools.HexTool;
+import tools.MapleAESOFB;
+import tools.data.input.ByteArrayByteStream;
+import tools.data.input.GenericLittleEndianAccessor;
+import tools.FilePrinter;
+
+public class MaplePacketDecoder extends CumulativeProtocolDecoder {
+    private static final String DECODER_STATE_KEY = MaplePacketDecoder.class.getName() + ".STATE";
+
+    private static class DecoderState {
+        public int packetlength = -1;
+    }
+
+    @Override
+    protected boolean doDecode(IoSession session, IoBuffer in, ProtocolDecoderOutput out) throws Exception {
+        final MapleClient client = (MapleClient) session.getAttribute(MapleClient.CLIENT_KEY);
+        if(client == null) {
+            MapleSessionCoordinator.getInstance().closeSession(session, true);
+            return false;
+        }
+        
+        DecoderState decoderState = (DecoderState) session.getAttribute(DECODER_STATE_KEY);
+        if (decoderState == null) {
+            decoderState = new DecoderState();
+            session.setAttribute(DECODER_STATE_KEY, decoderState);
+        }
+        
+        MapleAESOFB rcvdCrypto = client.getReceiveCrypto();
+        if (in.remaining() >= 4 && decoderState.packetlength == -1) {
+            int packetHeader = in.getInt();
+            if (!rcvdCrypto.checkPacket(packetHeader)) {
+                MapleSessionCoordinator.getInstance().closeSession(session, true);
+                return false;
+            }
+            decoderState.packetlength = MapleAESOFB.getPacketLength(packetHeader);
+        } else if (in.remaining() < 4 && decoderState.packetlength == -1) {
+            return false;
+        }
+        if (in.remaining() >= decoderState.packetlength) {
+            byte decryptedPacket[] = new byte[decoderState.packetlength];
+            in.get(decryptedPacket, 0, decoderState.packetlength);
+            decoderState.packetlength = -1;
+            rcvdCrypto.crypt(decryptedPacket);
+            MapleCustomEncryption.decryptData(decryptedPacket);
+            out.write(decryptedPacket);
+            if (YamlConfig.config.server.USE_DEBUG_SHOW_PACKET){ // Atoot's idea: packet traffic log, applied using auto-identation thanks to lrenex
+                int packetLen = decryptedPacket.length;
+                int pHeader = readFirstShort(decryptedPacket);
+                String pHeaderStr = Integer.toHexString(pHeader).toUpperCase();
+                String op = lookupSend(pHeader);
+                String Send = "ClientSend:" + op + " [" + pHeaderStr + "] (" + packetLen + ")\r\n";
+                if (packetLen <= 3000) {
+                    String SendTo = Send + HexTool.toString(decryptedPacket) + "\r\n" + HexTool.toStringFromAscii(decryptedPacket);
+                    System.out.println(SendTo);
+                    if (op == null) {
+                        System.out.println("UnknownPacket:" + SendTo);
+                    }
+                } else {
+                    FilePrinter.print(FilePrinter.PACKET_STREAM + MapleSessionCoordinator.getSessionRemoteAddress(session) + ".txt", HexTool.toString(new byte[]{decryptedPacket[0], decryptedPacket[1]}) + "...");
+                }
+            }
+            return true;
+        }
+        return false;
+    }
+    
+    private String lookupSend(int val) {
+        return OpcodeConstants.recvOpcodeNames.get(val);
+    }
+
+    private int readFirstShort(byte[] arr) {
+        return new GenericLittleEndianAccessor(new ByteArrayByteStream(arr)).readShort();
+    }
+}