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258 lines
12 KiB
Diff
258 lines
12 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Fri, 15 Feb 2019 01:08:19 -0500
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Subject: [PATCH] Allow Saving of Oversized Chunks
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The Minecraft World Region File format has a hard cap of 1MB per chunk.
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This is due to the fact that the header of the file format only allocates
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a single byte for sector count, meaning a maximum of 256 sectors, at 4k per sector.
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This limit can be reached fairly easily with books, resulting in the chunk being unable
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to save to the world. Worse off, is that nothing printed when this occured, and silently
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performed a chunk rollback on next load.
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This leads to security risk with duplication and is being actively exploited.
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This patch catches the too large scenario, falls back and moves any large Entity
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or Tile Entity into a new compound, and this compound is saved into a different file.
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On Chunk Load, we check for oversized status, and if so, we load the extra file and
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merge the Entities and Tile Entities from the oversized chunk back into the level to
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then be loaded as normal.
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Once a chunk is returned back to normal size, the oversized flag will clear, and no
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extra data file will exist.
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This fix maintains compatability with all existing Anvil Region Format tools as it
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does not alter the save format. They will just not know about the extra entities.
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This fix also maintains compatability if someone switches server jars to one without
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this fix, as the data will remain in the oversized file. Once the server returns
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to a jar with this fix, the data will be restored.
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diff --git a/src/main/java/net/minecraft/server/NBTCompressedStreamTools.java b/src/main/java/net/minecraft/server/NBTCompressedStreamTools.java
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index c9be8c7f40917056091f63d36311a10d6302acbb..f48b62af436de47484eb1cf496e97a29168586b0 100644
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--- a/src/main/java/net/minecraft/server/NBTCompressedStreamTools.java
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+++ b/src/main/java/net/minecraft/server/NBTCompressedStreamTools.java
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@@ -70,6 +70,7 @@ public class NBTCompressedStreamTools {
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}
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+ public static NBTTagCompound readNBT(DataInputStream datainputstream) throws IOException { return a(datainputstream); } // Paper - OBFHELPER
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public static NBTTagCompound a(DataInputStream datainputstream) throws IOException {
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return a((DataInput) datainputstream, NBTReadLimiter.a);
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}
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@@ -90,6 +91,7 @@ public class NBTCompressedStreamTools {
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}
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}
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+ public static void writeNBT(NBTTagCompound nbttagcompound, DataOutput dataoutput) throws IOException { a(nbttagcompound, dataoutput); } // Paper - OBFHELPER
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public static void a(NBTTagCompound nbttagcompound, DataOutput dataoutput) throws IOException {
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a((NBTBase) nbttagcompound, dataoutput);
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}
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diff --git a/src/main/java/net/minecraft/server/RegionFile.java b/src/main/java/net/minecraft/server/RegionFile.java
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index 26b55108ecf4cd48762b00da625b0ce1d2f42c67..f781bb12a1c37d8b3088d0f638eae80d5b80aca4 100644
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--- a/src/main/java/net/minecraft/server/RegionFile.java
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+++ b/src/main/java/net/minecraft/server/RegionFile.java
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@@ -17,6 +17,8 @@ import java.nio.file.Files;
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import java.nio.file.LinkOption;
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import java.nio.file.StandardCopyOption;
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import java.nio.file.StandardOpenOption;
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+import java.util.zip.InflaterInputStream; // Paper
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+
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import javax.annotation.Nullable;
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import org.apache.logging.log4j.LogManager;
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import org.apache.logging.log4j.Logger;
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@@ -32,13 +34,16 @@ public class RegionFile implements AutoCloseable {
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private final IntBuffer g;
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private final IntBuffer h;
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private final RegionFileBitSet freeSectors;
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+ public final File file;
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public RegionFile(File file, File file1, boolean flag) throws IOException {
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this(file.toPath(), file1.toPath(), RegionFileCompression.b, flag);
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}
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public RegionFile(java.nio.file.Path java_nio_file_path, java.nio.file.Path java_nio_file_path1, RegionFileCompression regionfilecompression, boolean flag) throws IOException {
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+ this.file = java_nio_file_path.toFile(); // Paper
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this.f = ByteBuffer.allocateDirect(8192);
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+ initOversizedState();
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this.freeSectors = new RegionFileBitSet();
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this.e = regionfilecompression;
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if (!Files.isDirectory(java_nio_file_path1, new LinkOption[0])) {
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@@ -389,6 +394,74 @@ public class RegionFile implements AutoCloseable {
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void run() throws IOException;
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}
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+ private final byte[] oversized = new byte[1024];
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+ private int oversizedCount = 0;
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+
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+ private synchronized void initOversizedState() throws IOException {
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+ File metaFile = getOversizedMetaFile();
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+ if (metaFile.exists()) {
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+ final byte[] read = java.nio.file.Files.readAllBytes(metaFile.toPath());
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+ System.arraycopy(read, 0, oversized, 0, oversized.length);
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+ for (byte temp : oversized) {
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+ oversizedCount += temp;
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+ }
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+ }
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+ }
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+
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+ private static int getChunkIndex(int x, int z) {
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+ return (x & 31) + (z & 31) * 32;
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+ }
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+ synchronized boolean isOversized(int x, int z) {
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+ return this.oversized[getChunkIndex(x, z)] == 1;
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+ }
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+ synchronized void setOversized(int x, int z, boolean oversized) throws IOException {
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+ final int offset = getChunkIndex(x, z);
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+ boolean previous = this.oversized[offset] == 1;
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+ this.oversized[offset] = (byte) (oversized ? 1 : 0);
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+ if (!previous && oversized) {
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+ oversizedCount++;
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+ } else if (!oversized && previous) {
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+ oversizedCount--;
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+ }
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+ if (previous && !oversized) {
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+ File oversizedFile = getOversizedFile(x, z);
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+ if (oversizedFile.exists()) {
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+ oversizedFile.delete();
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+ }
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+ }
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+ if (oversizedCount > 0) {
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+ if (previous != oversized) {
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+ writeOversizedMeta();
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+ }
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+ } else if (previous) {
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+ File oversizedMetaFile = getOversizedMetaFile();
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+ if (oversizedMetaFile.exists()) {
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+ oversizedMetaFile.delete();
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+ }
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+ }
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+ }
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+
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+ private void writeOversizedMeta() throws IOException {
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+ java.nio.file.Files.write(getOversizedMetaFile().toPath(), oversized);
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+ }
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+
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+ private File getOversizedMetaFile() {
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+ return new File(this.file.getParentFile(), this.file.getName().replaceAll("\\.mca$", "") + ".oversized.nbt");
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+ }
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+
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+ private File getOversizedFile(int x, int z) {
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+ return new File(this.file.getParentFile(), this.file.getName().replaceAll("\\.mca$", "") + "_oversized_" + x + "_" + z + ".nbt");
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+ }
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+
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+ synchronized NBTTagCompound getOversizedData(int x, int z) throws IOException {
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+ File file = getOversizedFile(x, z);
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+ try (DataInputStream out = new DataInputStream(new BufferedInputStream(new InflaterInputStream(new java.io.FileInputStream(file))))) {
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+ return NBTCompressedStreamTools.readNBT(out);
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+ }
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+
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+ }
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+ // Paper end
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+
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class ChunkBuffer extends ByteArrayOutputStream {
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private final ChunkCoordIntPair b;
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diff --git a/src/main/java/net/minecraft/server/RegionFileCache.java b/src/main/java/net/minecraft/server/RegionFileCache.java
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index 0305f3c93e8485552890dd5eca8e79277e2bb886..02bd568af727633a6e834d5328683a9ff67b9dd7 100644
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--- a/src/main/java/net/minecraft/server/RegionFileCache.java
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+++ b/src/main/java/net/minecraft/server/RegionFileCache.java
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@@ -44,6 +44,74 @@ public final class RegionFileCache implements AutoCloseable {
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}
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}
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+ // Paper start
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+ private static void printOversizedLog(String msg, File file, int x, int z) {
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+ org.apache.logging.log4j.LogManager.getLogger().fatal(msg + " (" + file.toString().replaceAll(".+[\\\\/]", "") + " - " + x + "," + z + ") Go clean it up to remove this message. /minecraft:tp " + (x<<4)+" 128 "+(z<<4) + " - DO NOT REPORT THIS TO PAPER - You may ask for help on Discord, but do not file an issue. These error messages can not be removed.");
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+ }
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+
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+ private static final int DEFAULT_SIZE_THRESHOLD = 1024 * 8;
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+ private static final int OVERZEALOUS_TOTAL_THRESHOLD = 1024 * 64;
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+ private static final int OVERZEALOUS_THRESHOLD = 1024;
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+ private static int SIZE_THRESHOLD = DEFAULT_SIZE_THRESHOLD;
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+ private static void resetFilterThresholds() {
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+ SIZE_THRESHOLD = Math.max(1024 * 4, Integer.getInteger("Paper.FilterThreshhold", DEFAULT_SIZE_THRESHOLD));
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+ }
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+ static {
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+ resetFilterThresholds();
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+ }
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+
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+ static boolean isOverzealous() {
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+ return SIZE_THRESHOLD == OVERZEALOUS_THRESHOLD;
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+ }
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+
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+
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+ private static NBTTagCompound readOversizedChunk(RegionFile regionfile, ChunkCoordIntPair chunkCoordinate) throws IOException {
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+ synchronized (regionfile) {
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+ try (DataInputStream datainputstream = regionfile.getReadStream(chunkCoordinate)) {
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+ NBTTagCompound oversizedData = regionfile.getOversizedData(chunkCoordinate.x, chunkCoordinate.z);
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+ NBTTagCompound chunk = NBTCompressedStreamTools.readNBT(datainputstream);
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+ if (oversizedData == null) {
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+ return chunk;
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+ }
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+ NBTTagCompound oversizedLevel = oversizedData.getCompound("Level");
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+ NBTTagCompound level = chunk.getCompound("Level");
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+
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+ mergeChunkList(level, oversizedLevel, "Entities");
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+ mergeChunkList(level, oversizedLevel, "TileEntities");
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+
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+ chunk.set("Level", level);
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+
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+ return chunk;
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+ } catch (Throwable throwable) {
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+ throwable.printStackTrace();
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+ throw throwable;
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+ }
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+ }
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+ }
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+
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+ private static void mergeChunkList(NBTTagCompound level, NBTTagCompound oversizedLevel, String key) {
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+ NBTTagList levelList = level.getList(key, 10);
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+ NBTTagList oversizedList = oversizedLevel.getList(key, 10);
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+
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+ if (!oversizedList.isEmpty()) {
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+ levelList.addAll(oversizedList);
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+ level.set(key, levelList);
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+ }
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+ }
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+
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+ private static int getNBTSize(NBTBase nbtBase) {
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+ DataOutputStream test = new DataOutputStream(new org.apache.commons.io.output.NullOutputStream());
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+ try {
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+ nbtBase.write(test);
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+ return test.size();
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+ } catch (IOException e) {
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+ e.printStackTrace();
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+ return 0;
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+ }
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+ }
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+
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+ // Paper End
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+
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@Nullable
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public NBTTagCompound read(ChunkCoordIntPair chunkcoordintpair) throws IOException {
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// CraftBukkit start - SPIGOT-5680: There's no good reason to preemptively create files on read, save that for writing
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@@ -53,6 +121,12 @@ public final class RegionFileCache implements AutoCloseable {
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}
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// CraftBukkit end
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DataInputStream datainputstream = regionfile.a(chunkcoordintpair);
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+ // Paper start
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+ if (regionfile.isOversized(chunkcoordintpair.x, chunkcoordintpair.z)) {
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+ printOversizedLog("Loading Oversized Chunk!", regionfile.file, chunkcoordintpair.x, chunkcoordintpair.z);
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+ return readOversizedChunk(regionfile, chunkcoordintpair);
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+ }
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+ // Paper end
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Throwable throwable = null;
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NBTTagCompound nbttagcompound;
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@@ -93,6 +167,7 @@ public final class RegionFileCache implements AutoCloseable {
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try {
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NBTCompressedStreamTools.a(nbttagcompound, (DataOutput) dataoutputstream);
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+ regionfile.setOversized(chunkcoordintpair.x, chunkcoordintpair.z, false); // We don't do this anymore
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} catch (Throwable throwable1) {
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throwable = throwable1;
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throw throwable1;
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