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Update Packet44 to take a snapshot of attributes to prevent concurrent modification leading to bad packets or CMEs. This is a REQURIED update to get support.

This commit is contained in:
md_5 2013-07-09 08:29:39 +10:00
parent d06a613c2f
commit 3ec60528a2
1 changed files with 30 additions and 15 deletions
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47
CraftBukkit-Patches/0067-Snapshot-Protocol.patch
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@ -1,4 +1,4 @@
From f56b55c5dcd17f2238647b1a32ad097274cf5650 Mon Sep 17 00:00:00 2001
From 58f01e434d47d9543b1ef368c99503645fe6495e Mon Sep 17 00:00:00 2001
From: md_5 <md_5@live.com.au>
Date: Mon, 8 Jul 2013 21:27:40 +1000
Subject: [PATCH] Snapshot Protocol
@ -125,24 +125,35 @@ index 0000000..a1b2bbb
+}
diff --git a/src/main/java/net/minecraft/server/Packet44UpdateAttributes.java b/src/main/java/net/minecraft/server/Packet44UpdateAttributes.java
new file mode 100644
index 0000000..2d60528
index 0000000..f0a5d99
--- /dev/null
+++ b/src/main/java/net/minecraft/server/Packet44UpdateAttributes.java
@@ -0,0 +1,60 @@
@@ -0,0 +1,75 @@
+package net.minecraft.server;
+
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.Map.Entry;
+
+public class Packet44UpdateAttributes extends Packet {
+
+ private class AttributeSnapshot
+ {
+
+ private final String a;
+ private final double b;
+ private final Collection c;
+
+ public AttributeSnapshot(String a, double b, Collection c)
+ {
+ this.a = a;
+ this.b = b;
+ this.c = c;
+ }
+ }
+ private int a;
+ private final java.util.List<AttributeModifiable> b = new java.util.ArrayList<AttributeModifiable>();
+ private final java.util.List<AttributeSnapshot> b = new java.util.ArrayList<AttributeSnapshot>();
+
+ public Packet44UpdateAttributes() {}
+
@ -151,9 +162,9 @@ index 0000000..2d60528
+ Iterator iterator = collection.iterator();
+
+ while (iterator.hasNext()) {
+ AttributeModifiable attributeinstance = (AttributeModifiable) iterator.next();
+ AttributeInstance attributeinstance = (AttributeInstance) iterator.next();
+
+ this.b.add( attributeinstance );
+ this.b.add( new AttributeSnapshot( attributeinstance.a().a(),attributeinstance.b(),attributeinstance.c() ) );
+ }
+ }
+
@ -164,15 +175,19 @@ index 0000000..2d60528
+ public void a(DataOutput dataoutput) throws java.io.IOException { // Spigot - throws
+ dataoutput.writeInt( this.a );
+ dataoutput.writeInt( this.b.size() );
+ for ( AttributeModifiable attribute : this.b )
+ {
+ a( attribute.a().a(), dataoutput );
+ dataoutput.writeDouble( attribute.b() );
+ dataoutput.writeShort( attribute.c().size() );
+ Iterator<AttributeSnapshot> iter = this.b.iterator();
+
+ for ( Object o : attribute.c() )
+ while(iter.hasNext())
+ {
+ AttributeSnapshot attribute = iter.next();
+ a( attribute.a, dataoutput );
+ dataoutput.writeDouble( attribute.b );
+ dataoutput.writeShort( attribute.c.size() );
+
+ Iterator<AttributeModifier> inner = attribute.c.iterator();
+ while(inner.hasNext())
+ {
+ AttributeModifier modifier = (AttributeModifier) o;
+ AttributeModifier modifier = (AttributeModifier) inner.next();
+ dataoutput.writeLong( modifier.a().getMostSignificantBits() );
+ dataoutput.writeLong( modifier.a().getLeastSignificantBits() );
+ dataoutput.writeDouble( modifier.d() );