From 8375c097918c91e3a4ff945847903ff33c1f770f Mon Sep 17 00:00:00 2001 From: Aikar <aikar@aikar.co> Date: Sat, 11 Aug 2018 00:49:20 -0400 Subject: [PATCH] Detect and repair corrupt Region Files If the file has partial data written but not the full 8192 bytes, then the server will be unable to load that region file... I don't know why mojang only checks for 4096, when anything less than 8192 is a crash. But to be safe, it will attempt to back up the file. diff --git a/src/main/java/net/minecraft/server/RegionFile.java b/src/main/java/net/minecraft/server/RegionFile.java index 5d2853b9ce..6a2edfd1e1 100644 --- a/src/main/java/net/minecraft/server/RegionFile.java +++ b/src/main/java/net/minecraft/server/RegionFile.java @@ -22,10 +22,10 @@ import javax.annotation.Nullable; public class RegionFile { private static final byte[] a = new byte[4096]; - private final File b; - private RandomAccessFile c; - private final int[] d = new int[1024]; - private final int[] e = new int[1024]; + private final File b;private File getFile() { return b; } // Paper - OBFHELPER + private RandomAccessFile c;private RandomAccessFile getDataFile() { return c; } // Paper - OBFHELPER + private final int[] d = new int[1024];private int[] offsets = d; // Paper - OBFHELPER + private final int[] e = new int[1024];private int[] timestamps = e; // Paper - OBFHELPER private List<Boolean> f; private int g; private long h; @@ -40,7 +40,7 @@ public class RegionFile { } this.c = new RandomAccessFile(file1, "rw"); - if (this.c.length() < 4096L) { + if (this.c.length() < 8192L) { // Paper - headers should be 8192 this.c.write(a); this.c.write(a); this.g += 8192; @@ -74,16 +74,16 @@ public class RegionFile { for(int j1 = 0; j1 < 1024; ++j1) { int k = headerAsInts.get(); // Paper this.d[j1] = k; - if (k != 0 && (k >> 8) + (k & 255) <= this.f.size()) { + if (k > 0 && (k >> 8) > 1 && (k >> 8) + (k & 255) <= this.f.size()) { // Paper >= 1 as 0/1 are the headers, and negative isnt valid for(int l = 0; l < (k & 255); ++l) { this.f.set((k >> 8) + l, false); } - } + } else if (k != 0) deleteChunk(j1); // Paper } for(int k1 = 0; k1 < 1024; ++k1) { int l1 = headerAsInts.get(); // Paper - this.e[k1] = l1; + if (offsets[k1] != 0) this.timestamps[k1] = l1; // Paper - don't set timestamp if it got 0'd above due to corruption } } catch (IOException ioexception) { ioexception.printStackTrace(); @@ -276,6 +276,55 @@ public class RegionFile { } + // Paper start + public synchronized void deleteChunk(int j1) { + backup(); + int k = offsets[j1]; + int x = j1 & 1024; + int z = j1 >> 2; + int offset = (k >> 8); + int len = (k & 255); + org.apache.logging.log4j.Logger logger = org.apache.logging.log4j.LogManager.getLogger(); + String debug = "idx:" + + j1 + " - " + x + "," + z + " - offset: " + offset + " - len: " + len; + try { + RandomAccessFile file = getDataFile(); + file.seek(j1 * 4); + file.writeInt(0); + // clear the timestamp + file.seek(4096 + j1 * 4); + file.writeInt(0); + timestamps[j1] = 0; + offsets[j1] = 0; + logger.error("Deleted corrupt chunk (" + debug + ") " + getFile().getAbsolutePath(), e); + } catch (IOException e) { + + logger.error("Error deleting corrupt chunk (" + debug + ") " + getFile().getAbsolutePath(), e); + } + } + private boolean backedUp = false; + private synchronized void backup() { + if (backedUp) { + return; + } + backedUp = true; + File file = this.getFile(); + java.text.DateFormat formatter = new java.text.SimpleDateFormat("yyyy-MM-dd"); + java.util.Date today = new java.util.Date(); + File corrupt = new File(file.getParentFile(), file.getName() + "." + formatter.format(today) + ".corrupt"); + if (corrupt.exists()) { + return; + } + org.apache.logging.log4j.Logger logger = org.apache.logging.log4j.LogManager.getLogger(); + logger.error("Region file " + file.getAbsolutePath() + " was corrupt. Backing up to " + corrupt.getAbsolutePath() + " and repairing"); + try { + java.nio.file.Files.copy(file.toPath(), corrupt.toPath()); + + } catch (IOException e) { + logger.error("Error backing up corrupt file" + file.getAbsolutePath(), e); + } + } + // Paper end + class ChunkBuffer extends ByteArrayOutputStream { private final int b; private final int c; -- 2.19.1