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Deobfuscate stacktraces in log messages using a RewriteAppender and a custom RewritePolicy (#5926) 

Also replace a couple calls to `System.err` with logger usages, as traces printed with the former do not get deobfuscated.
This commit is contained in:
Jason 2021-06-21 01:09:18 -07:00 committed by GitHub
parent 1830de58bf
commit 10e9c5a01c
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
8 changed files with 415 additions and 39 deletions
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12
patches/server/0026-Prevent-tile-entity-and-entity-crashes.patch
View File

@ -5,7 +5,7 @@ Subject: [PATCH] Prevent tile entity and entity crashes
diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index d29334b5dee6fe3f292f774442304b7dc6b0e2f0..d6ed061e36668ea1cbaee44c06575534336008fc 100644
index d29334b5dee6fe3f292f774442304b7dc6b0e2f0..939f88ab37eca30e8ad08cbe2045b66ee64aa952 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -729,11 +729,11 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
@ -18,8 +18,8 @@ index d29334b5dee6fe3f292f774442304b7dc6b0e2f0..d6ed061e36668ea1cbaee44c06575534
- entity.fillCrashReportCategory(crashreportsystemdetails);
- throw new ReportedException(crashreport);
+ // Paper start - Prevent tile entity and entity crashes
+ System.err.println("Entity threw exception at " + entity.level.getWorld().getName() + ":" + entity.getX() + "," + entity.getY() + "," + entity.getZ());
+ throwable.printStackTrace();
+ final String msg = String.format("Entity threw exception at %s:%s,%s,%s", entity.level.getWorld().getName(), entity.getX(), entity.getY(), entity.getZ());
+ MinecraftServer.LOGGER.error(msg, throwable);
+ entity.discard();
+ // Paper end
}
@ -44,7 +44,7 @@ index 7b333e2d6884b272abefbc820bcce8026a4cdf7e..66ab4deedd177f507d170a61ceca4c3e
}
}
diff --git a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
index 743aafec1f1c819846813688355dd90534dddb3e..21f613b8d7785b996866b5059f3cb1bc87533d2e 100644
index 743aafec1f1c819846813688355dd90534dddb3e..5bd2172a88c95722b86959e42442e8a3ab76879c 100644
--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
@@ -1241,11 +1241,11 @@ public class LevelChunk implements ChunkAccess {
@ -57,8 +57,8 @@ index 743aafec1f1c819846813688355dd90534dddb3e..21f613b8d7785b996866b5059f3cb1bc
- this.blockEntity.fillCrashReportCategory(crashreportsystemdetails);
- throw new ReportedException(crashreport);
+ // Paper start - Prevent tile entity and entity crashes
+ System.err.println("TileEntity threw exception at " + LevelChunk.this.getLevel().getWorld().getName() + ":" + this.getPos().getX() + "," + this.getPos().getY() + "," + this.getPos().getZ());
+ throwable.printStackTrace();
+ final String msg = String.format("BlockEntity threw exception at %s:%s,%s,%s", LevelChunk.this.getLevel().getWorld().getName(), this.getPos().getX(), this.getPos().getY(), this.getPos().getZ());
+ net.minecraft.server.MinecraftServer.LOGGER.error(msg, throwable);
+ LevelChunk.this.removeBlockEntity(this.getPos());
+ // Paper end
// Spigot start

24
patches/server/0053-Add-exception-reporting-event.patch
View File

@ -108,7 +108,7 @@ index 08c5f6fd1a307c89cf8365f56314a0c6d3e89e4b..26e0f03f2e736ed6ba86e2510a7962de
}
diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index da8e6f5b48a83ca4178c0de439200b7952f409d9..969a5ed2484036103834dc23b57b33c11896d72f 100644
index 718f31b74207c7ef06c1861fbc58de01cf67be3b..dda9ac55bd7b8cce055eac1f067d7ab70ed4dca7 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -1,5 +1,10 @@
@ -122,14 +122,10 @@ index da8e6f5b48a83ca4178c0de439200b7952f409d9..969a5ed2484036103834dc23b57b33c1
import com.google.common.collect.Lists;
import com.mojang.serialization.Codec;
import java.io.IOException;
@@ -729,8 +734,10 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
tickConsumer.accept(entity);
} catch (Throwable throwable) {
@@ -731,6 +736,7 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
// Paper start - Prevent tile entity and entity crashes
- System.err.println("Entity threw exception at " + entity.level.getWorld().getName() + ":" + entity.getX() + "," + entity.getY() + "," + entity.getZ());
+ String msg = "Entity threw exception at " + entity.level.getWorld().getName() + ":" + entity.getX() + "," + entity.getY() + "," + entity.getZ();
+ System.err.println(msg);
throwable.printStackTrace();
final String msg = String.format("Entity threw exception at %s:%s,%s,%s", entity.level.getWorld().getName(), entity.getX(), entity.getY(), entity.getZ());
MinecraftServer.LOGGER.error(msg, throwable);
+ getCraftServer().getPluginManager().callEvent(new ServerExceptionEvent(new ServerInternalException(msg, throwable)));
entity.discard();
// Paper end
@ -155,7 +151,7 @@ index b4a7776ba9486bbca42ffb596c8a8bcdf6471ce3..59fae60116167baf989e85596334824e
}
diff --git a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
index 21f613b8d7785b996866b5059f3cb1bc87533d2e..249f39bc0c5820e313cad7813bd1087cb2e09ed6 100644
index 5bd2172a88c95722b86959e42442e8a3ab76879c..bf5a039553a31ed6e9d9bfa64cbd435b3e551a08 100644
--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
@@ -1,6 +1,7 @@
@ -186,14 +182,10 @@ index 21f613b8d7785b996866b5059f3cb1bc87533d2e..249f39bc0c5820e313cad7813bd1087c
// CraftBukkit end
}
}
@@ -1242,8 +1248,10 @@ public class LevelChunk implements ChunkAccess {
gameprofilerfiller.pop();
} catch (Throwable throwable) {
@@ -1244,6 +1250,7 @@ public class LevelChunk implements ChunkAccess {
// Paper start - Prevent tile entity and entity crashes
- System.err.println("TileEntity threw exception at " + LevelChunk.this.getLevel().getWorld().getName() + ":" + this.getPos().getX() + "," + this.getPos().getY() + "," + this.getPos().getZ());
+ String msg = "TileEntity threw exception at " + LevelChunk.this.getLevel().getWorld().getName() + ":" + this.getPos().getX() + "," + this.getPos().getY() + "," + this.getPos().getZ();
+ System.err.println(msg);
throwable.printStackTrace();
final String msg = String.format("BlockEntity threw exception at %s:%s,%s,%s", LevelChunk.this.getLevel().getWorld().getName(), this.getPos().getX(), this.getPos().getY(), this.getPos().getZ());
net.minecraft.server.MinecraftServer.LOGGER.error(msg, throwable);
+ net.minecraft.world.level.chunk.LevelChunk.this.level.getCraftServer().getPluginManager().callEvent(new com.destroystokyo.paper.event.server.ServerExceptionEvent(new ServerInternalException(msg, throwable)));
LevelChunk.this.removeBlockEntity(this.getPos());
// Paper end

4
patches/server/0232-Option-to-prevent-armor-stands-from-doing-entity-loo.patch
View File

@ -31,10 +31,10 @@ index 6d717d3852afb3a3a4bef30c68980c402bdfefff..b47b1215e685c453c3496439bb350a91
for (int i = 0; i < list.size(); ++i) {
diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index 08f612b7d2e861ef7e8b91e622c7a278542809f0..00e5672f4d302d5ccfe3942e61fe0c0beb782b82 100644
index 45a9c7d5b8999d1abd7f5ef805f068f5b532dcfa..00e6ad6ce3bc8e4542284f426fd601abb669b57d 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -768,6 +768,13 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
@@ -767,6 +767,13 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
// Paper end
}
}

4
patches/server/0323-Optimize-Captured-TileEntity-Lookup.patch
View File

@ -10,10 +10,10 @@ Optimize to check if the captured list even has values in it, and also to
just do a get call since the value can never be null.
diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index c85f6fedfaf756f8b17b554bcb2d94d0f00f01f1..5d021fbaeeb2655a775053225a9614d7881331c4 100644
index 8076ad15b67d86b38ba61d701df921b0f615fd80..5b06aa23191d5e78cee7ac167ea39446c6c25b95 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -871,9 +871,12 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
@@ -870,9 +870,12 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
@Nullable
public BlockEntity getTileEntity(BlockPos blockposition, boolean validate) {

10
patches/server/0367-Anti-Xray.patch
View File

@ -1118,7 +1118,7 @@ index badac53382c776eba3efccfda42283912d07b99a..06e581bc0c0ea4e8141f7b9610cc5a7e
}
diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
index 22db34272c6635438d11f525fb4f08e2aa631f55..fcf5c7b28e927db977ad5b851edaf68e59de8d5b 100644
index 39997c5028fe51e2fefbd2d50353575080d92f3c..950182275f2e95c5d2ac5e715b968e86c3bdeb93 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -292,7 +292,7 @@ public class ServerLevel extends net.minecraft.world.level.Level implements Worl
@ -1153,7 +1153,7 @@ index f4a056185990181e486f452960159a5287947382..a695e5a0c2e8846333ccb9aea499b565
public void destroyAndAck(BlockPos pos, ServerboundPlayerActionPacket.Action action, String reason) {
diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index 580b3d7d993751e7c04e6b7d5d4d8fa9d150d383..83673e66aab4988e912d78fb8d1a45f807e38bd9 100644
index 6d9c74595cd8883167554e8b52008a99d6e113c3..afdbec2365db55ab968b15368ae9ce239b63f373 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -164,6 +164,7 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
@ -1229,7 +1229,7 @@ index 69c2454533e6f21c70792b555ec02c6bc6d169b3..2607c7ba5cf1aca5f3e5c22be2e4e8b3
@Override
diff --git a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
index 8cc0f2a74191357ab52f30439a515709f8ab80d1..fbb82d344f654b90809582916442c520f344aa39 100644
index 0530de6e9167419b180a3fd6e890d27d9d86c04c..2accbda808b485fa75011b7493567138b0945096 100644
--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
@@ -456,7 +456,7 @@ public class LevelChunk implements ChunkAccess {
@ -1241,7 +1241,7 @@ index 8cc0f2a74191357ab52f30439a515709f8ab80d1..fbb82d344f654b90809582916442c520
this.sections[j] = chunksection;
}
@@ -1307,4 +1307,11 @@ public class LevelChunk implements ChunkAccess {
@@ -1306,4 +1306,11 @@ public class LevelChunk implements ChunkAccess {
return "Level ticker for " + s + "@" + this.getPos();
}
}
@ -1448,7 +1448,7 @@ index 64cb0658021866c3875d145cc4266896e57c081e..f0c537e1d6b32ecde52b3d456f0f3889
@Override
public FluidState getFluidIfLoaded(BlockPos blockposition) {
diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java
index c131f6093c395b4d9e401d3c447e7fb13c631ecf..c09a1c640075bde9f656b11258f5adbd2daa4b0b 100644
index abd02d88911cbbbe6f770039aa0649cff85d85ee..9db83a8f2eceac41f6b86430e719bad1a12471b5 100644
--- a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java
+++ b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java
@@ -136,7 +136,7 @@ public class ChunkSerializer {

4
patches/server/0373-Avoid-hopper-searches-if-there-are-no-items.patch
View File

@ -14,10 +14,10 @@ And since minecart hoppers are used _very_ rarely near we can avoid alot of sear
Combined, this adds up a lot.
diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index d58a7adb58abc91f66fc893ee7a7a7bded3619a8..af1cee79e27667b78413760286f517c91d1517cb 100644
index 864b3efc014bf1c499257d01a7e8bce910ae85d0..7ffe9718188ba57cb2a7b934a40d5f893543a63a 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -990,7 +990,7 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
@@ -989,7 +989,7 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
}
}

12
patches/server/0404-Improved-Watchdog-Support.patch
View File

@ -299,7 +299,7 @@ index 7bf4bf5cb2c1b54a7e2733091f48f3a824336d36..dcce05d2f4ab16424db4ab103a12188e
}
diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index af1cee79e27667b78413760286f517c91d1517cb..c84070d05d325a8f49c3918cc112087b9c1074e9 100644
index 7ffe9718188ba57cb2a7b934a40d5f893543a63a..c407e85bd16b8f91b262bd6528253f902cbf9af6 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -843,6 +843,7 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
@ -308,10 +308,10 @@ index af1cee79e27667b78413760286f517c91d1517cb..c84070d05d325a8f49c3918cc112087b
} catch (Throwable throwable) {
+ if (throwable instanceof ThreadDeath) throw throwable; // Paper
// Paper start - Prevent tile entity and entity crashes
String msg = "Entity threw exception at " + entity.level.getWorld().getName() + ":" + entity.getX() + "," + entity.getY() + "," + entity.getZ();
System.err.println(msg);
final String msg = String.format("Entity threw exception at %s:%s,%s,%s", entity.level.getWorld().getName(), entity.getX(), entity.getY(), entity.getZ());
MinecraftServer.LOGGER.error(msg, throwable);
diff --git a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
index e19f5d5d58a8b2e4f35907e1c88224cac7f20e57..61c70e17401ec85c0a7e6e1793f6689506b8059a 100644
index a1f763536d77065e1ce779733a505df43be225ae..5c83bc6e5fbf10989f72c7210d3528daa9966f04 100644
--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
@@ -1319,6 +1319,7 @@ public class LevelChunk implements ChunkAccess {
@ -320,8 +320,8 @@ index e19f5d5d58a8b2e4f35907e1c88224cac7f20e57..61c70e17401ec85c0a7e6e1793f66895
} catch (Throwable throwable) {
+ if (throwable instanceof ThreadDeath) throw throwable; // Paper
// Paper start - Prevent tile entity and entity crashes
String msg = "TileEntity threw exception at " + LevelChunk.this.getLevel().getWorld().getName() + ":" + this.getPos().getX() + "," + this.getPos().getY() + "," + this.getPos().getZ();
System.err.println(msg);
final String msg = String.format("BlockEntity threw exception at %s:%s,%s,%s", LevelChunk.this.getLevel().getWorld().getName(), this.getPos().getX(), this.getPos().getY(), this.getPos().getZ());
net.minecraft.server.MinecraftServer.LOGGER.error(msg, throwable);
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index 2f7ab3142f44c657f3585c8f8a6872fbfac81768..a7d087875ec2d493ef6ed0fcdc03d89445d9008b 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java

384
patches/server/0717-Deobfuscate-stacktraces-in-log-messages-using-a-Rewr.patch Normal file
View File

@ -0,0 +1,384 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jason Penilla <11360596+jpenilla@users.noreply.github.com>
Date: Sun, 20 Jun 2021 18:19:09 -0700
Subject: [PATCH] Deobfuscate stacktraces in log messages using a
RewriteAppender and a custom RewritePolicy
diff --git a/build.gradle.kts b/build.gradle.kts
index 04938bb10c35d2e424043adb7ed8fec2e42bb816..f427c6f5adf20f9e1b1fa4ab56041506d8240c92 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,8 +1,12 @@
import com.github.jengelman.gradle.plugins.shadow.transformers.Log4j2PluginsCacheFileTransformer
import com.github.jengelman.gradle.plugins.shadow.transformers.Transformer
+import io.papermc.paperweight.tasks.BaseTask
import io.papermc.paperweight.util.Git
+import io.papermc.paperweight.util.defaultOutput
+import io.papermc.paperweight.util.openZip
import io.papermc.paperweight.util.path
import shadow.org.apache.logging.log4j.core.config.plugins.processor.PluginProcessor.PLUGIN_CACHE_FILE
+import java.nio.file.Files
import java.text.SimpleDateFormat
import java.util.Date
import java.util.Locale
@@ -15,6 +19,14 @@ plugins {
repositories {
maven("https://libraries.minecraft.net/")
+ // Paper start
+ maven("https://maven.quiltmc.org/repository/release/") {
+ mavenContent {
+ releasesOnly()
+ includeModule("org.quiltmc", "tiny-mappings-parser")
+ }
+ }
+ // Paper end
}
dependencies {
@@ -52,6 +64,8 @@ dependencies {
implementation("com.github.oshi:oshi-core:5.7.5") // Paper - fix startup delay and warning
+ implementation("org.quiltmc:tiny-mappings-parser:0.3.0") // Paper - needed to read mappings for stacktrace deobfuscation
+
testImplementation("io.github.classgraph:classgraph:4.8.47") // Paper - mob goal test
testImplementation("junit:junit:4.13.1")
testImplementation("org.hamcrest:hamcrest-library:1.3")
@@ -115,6 +129,44 @@ tasks.shadowJar {
transform(ModifiedLog4j2PluginsCacheFileTransformer::class.java)
}
+// Paper start - include reobf mappings in jar for stacktrace deobfuscation
+abstract class IncludeMappings : BaseTask() {
+ @get:InputFile
+ abstract val inputJar: RegularFileProperty
+
+ @get:InputFile
+ abstract val mappings: RegularFileProperty
+
+ @get:OutputFile
+ abstract val outputJar: RegularFileProperty
+
+ override fun init() {
+ outputJar.convention(defaultOutput())
+ }
+
+ @TaskAction
+ private fun addMappings() {
+ outputJar.get().asFile.parentFile.mkdirs()
+ inputJar.get().asFile.copyTo(outputJar.get().asFile, overwrite = true)
+ outputJar.get().path.openZip().use { fs ->
+ val dir = fs.getPath("META-INF/mappings/")
+ Files.createDirectories(dir)
+ val target = dir.resolve("reobf.tiny")
+ Files.copy(mappings.path, target)
+ }
+ }
+}
+
+val includeMappings = tasks.register<IncludeMappings>("includeMappings") {
+ inputJar.set(tasks.shadowJar.flatMap { it.archiveFile })
+ mappings.set(tasks.reobfJar.flatMap { it.mappingsFile })
+}
+
+tasks.reobfJar {
+ inputJar.set(includeMappings.flatMap { it.outputJar })
+}
+// Paper end - include reobf mappings in jar for stacktrace deobfuscation
+
tasks.test {
exclude("org/bukkit/craftbukkit/inventory/ItemStack*Test.class")
}
diff --git a/src/main/java/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
index 7acf077bc131af718c7548cc29deef558c04e463..73652e403eaa419fb5b4b54bd506f246c0aa4e99 100644
--- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
@@ -487,6 +487,11 @@ public class PaperConfig {
enableBrigadierConsoleCompletions = getBoolean("settings.console.enable-brigadier-completions", enableBrigadierConsoleCompletions);
}
+ public static boolean deobfuscateStacktraces = true;
+ private static void loggerSettings() {
+ deobfuscateStacktraces = getBoolean("settings.loggers.deobfuscate-stacktraces", deobfuscateStacktraces);
+ }
+
public static int itemValidationDisplayNameLength = 8192;
public static int itemValidationLocNameLength = 8192;
public static int itemValidationLoreLineLength = 8192;
diff --git a/src/main/java/io/papermc/paper/logging/StacktraceDeobfuscatingRewritePolicy.java b/src/main/java/io/papermc/paper/logging/StacktraceDeobfuscatingRewritePolicy.java
new file mode 100644
index 0000000000000000000000000000000000000000..5293a59d17eeb711694965816857e66481ff0277
--- /dev/null
+++ b/src/main/java/io/papermc/paper/logging/StacktraceDeobfuscatingRewritePolicy.java
@@ -0,0 +1,242 @@
+package io.papermc.paper.logging;
+
+import com.destroystokyo.paper.PaperConfig;
+import com.google.common.base.Charsets;
+import com.google.common.collect.ImmutableMap;
+import com.mojang.datafixers.util.Pair;
+import it.unimi.dsi.fastutil.ints.IntArrayList;
+import it.unimi.dsi.fastutil.ints.IntList;
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import net.fabricmc.mapping.tree.ClassDef;
+import net.fabricmc.mapping.tree.MethodDef;
+import net.fabricmc.mapping.tree.TinyMappingFactory;
+import net.fabricmc.mapping.tree.TinyTree;
+import org.apache.logging.log4j.core.Core;
+import org.apache.logging.log4j.core.LogEvent;
+import org.apache.logging.log4j.core.appender.rewrite.RewritePolicy;
+import org.apache.logging.log4j.core.config.plugins.Plugin;
+import org.apache.logging.log4j.core.config.plugins.PluginFactory;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.objectweb.asm.ClassReader;
+import org.objectweb.asm.ClassVisitor;
+import org.objectweb.asm.Label;
+import org.objectweb.asm.MethodVisitor;
+import org.objectweb.asm.Opcodes;
+
+@Plugin(
+ name = "StacktraceDeobfuscatingRewritePolicy",
+ category = Core.CATEGORY_NAME,
+ elementType = "rewritePolicy",
+ printObject = true
+)
+public final class StacktraceDeobfuscatingRewritePolicy implements RewritePolicy {
+ private static final String MOJANG_PLUS_YARN_NAMESPACE = "mojang+yarn";
+ private static final String SPIGOT_NAMESPACE = "spigot";
+
+ private final @Nullable Map<String, ClassMapping> mappings;
+ private final Map<Class<?>, Map<Pair<String, String>, IntList>> lineMapCache = Collections.synchronizedMap(new LinkedHashMap<>(64, 0.75f, true) {
+ @Override
+ protected boolean removeEldestEntry(final Map.Entry<Class<?>, Map<Pair<String, String>, IntList>> eldest) {
+ return this.size() > 63;
+ }
+ });
+
+ StacktraceDeobfuscatingRewritePolicy() {
+ this.mappings = loadMappingsIfPresent();
+ }
+
+ private static @Nullable Map<String, ClassMapping> loadMappingsIfPresent() {
+ try (final InputStream mappingsInputStream = StacktraceDeobfuscatingRewritePolicy.class.getClassLoader().getResourceAsStream("mappings/reobf.tiny")) {
+ if (mappingsInputStream == null) {
+ return null;
+ }
+ final TinyTree tree = TinyMappingFactory.loadWithDetection(new BufferedReader(new InputStreamReader(mappingsInputStream, Charsets.UTF_8)));
+ final var builder = ImmutableMap.<String, ClassMapping>builder();
+
+ for (final ClassDef classDef : tree.getClasses()) {
+ final String obfClassName = classDef.getName(SPIGOT_NAMESPACE).replace('/', '.');
+ final var methodMappings = ImmutableMap.<Pair<String, String>, MethodMapping>builder();
+
+ for (final MethodDef methodDef : classDef.getMethods()) {
+ final MethodMapping method = new MethodMapping(
+ methodDef.getName(SPIGOT_NAMESPACE),
+ methodDef.getName(MOJANG_PLUS_YARN_NAMESPACE),
+ methodDef.getDescriptor(SPIGOT_NAMESPACE)
+ );
+ methodMappings.put(
+ new Pair<>(method.obfName(), method.descriptor()),
+ method
+ );
+ }
+
+ final ClassMapping map = new ClassMapping(
+ obfClassName,
+ classDef.getName(MOJANG_PLUS_YARN_NAMESPACE).replace('/', '.'),
+ methodMappings.build()
+ );
+ builder.put(map.obfName(), map);
+ }
+
+ return builder.build();
+ } catch (final IOException ex) {
+ System.err.println("Failed to load mappings for stacktrace deobfuscation.");
+ ex.printStackTrace();
+ return null;
+ }
+ }
+
+ @Override
+ public @NotNull LogEvent rewrite(final @NotNull LogEvent rewrite) {
+ if (!PaperConfig.deobfuscateStacktraces) {
+ return rewrite;
+ }
+
+ final Throwable thrown = rewrite.getThrown();
+ if (thrown != null) {
+ this.deobfuscateThrowable(thrown);
+ }
+ return rewrite;
+ }
+
+ public void deobfuscateThrowable(final Throwable throwable) {
+ throwable.setStackTrace(this.deobfuscateStacktrace(throwable.getStackTrace()));
+ final Throwable cause = throwable.getCause();
+ if (cause != null) {
+ this.deobfuscateThrowable(cause);
+ }
+ for (final Throwable suppressed : throwable.getSuppressed()) {
+ this.deobfuscateThrowable(suppressed);
+ }
+ }
+
+ public StackTraceElement[] deobfuscateStacktrace(final StackTraceElement[] traceElements) {
+ if (this.mappings == null || traceElements.length == 0) {
+ return traceElements;
+ }
+ final StackTraceElement[] result = new StackTraceElement[traceElements.length];
+ for (int i = 0; i < traceElements.length; i++) {
+ final StackTraceElement element = traceElements[i];
+
+ final String className = element.getClassName();
+ final String methodName = element.getMethodName();
+
+ final ClassMapping classMapping = this.mappings.get(className);
+ if (classMapping == null) {
+ result[i] = element;
+ continue;
+ }
+
+ final Pair<String, String> nameDescriptorPair;
+ try {
+ final Class<?> clazz = Class.forName(className);
+ nameDescriptorPair = this.determineMethodForLine(clazz, element.getLineNumber());
+ } catch (final ReflectiveOperationException ex) {
+ throw new RuntimeException(ex);
+ }
+
+ final MethodMapping methodMapping = classMapping.methodMappings().get(nameDescriptorPair);
+
+ result[i] = new StackTraceElement(
+ element.getClassLoaderName(),
+ element.getModuleName(),
+ element.getModuleVersion(),
+ classMapping.mojangName(),
+ methodMapping != null ? methodMapping.mojangName() : methodName,
+ this.mappedFileName(classMapping.mojangName()),
+ element.getLineNumber()
+ );
+ }
+ return result;
+ }
+
+ private static @NotNull Map<Pair<String, String>, IntList> buildLineMap(final @NotNull Class<?> key) {
+ final Map<Pair<String, String>, IntList> lineMap = new HashMap<>();
+ final class LineCollectingMethodVisitor extends MethodVisitor {
+ private final IntList lines = new IntArrayList();
+ private final String name;
+ private final String descriptor;
+
+ LineCollectingMethodVisitor(String name, String descriptor) {
+ super(Opcodes.ASM9);
+ this.name = name;
+ this.descriptor = descriptor;
+ }
+
+ @Override
+ public void visitLineNumber(int line, Label start) {
+ super.visitLineNumber(line, start);
+ this.lines.add(line);
+ }
+
+ @Override
+ public void visitEnd() {
+ super.visitEnd();
+ lineMap.put(new Pair<>(this.name, this.descriptor), this.lines);
+ }
+ }
+ final ClassVisitor classVisitor = new ClassVisitor(Opcodes.ASM9) {
+ @Override
+ public MethodVisitor visitMethod(int access, String name, String descriptor, String signature, String[] exceptions) {
+ return new LineCollectingMethodVisitor(name, descriptor);
+ }
+ };
+ try {
+ final ClassReader reader = new ClassReader(key.getName());
+ reader.accept(classVisitor, 0);
+ } catch (final IOException ex) {
+ throw new RuntimeException(ex);
+ }
+ return lineMap;
+ }
+
+ private @Nullable Pair<String, String> determineMethodForLine(final @NotNull Class<?> clazz, final int lineNumber) {
+ final Map<Pair<String, String>, IntList> lineMap = this.lineMapCache.computeIfAbsent(clazz, StacktraceDeobfuscatingRewritePolicy::buildLineMap);
+ for (final var entry : lineMap.entrySet()) {
+ final Pair<String, String> pair = entry.getKey();
+ final IntList lines = entry.getValue();
+ for (int i = 0, linesSize = lines.size(); i < linesSize; i++) {
+ final int num = lines.getInt(i);
+ if (num == lineNumber) {
+ return pair;
+ }
+ }
+ }
+ return null;
+ }
+
+ private @NotNull String mappedFileName(final @NotNull String fullClassName) {
+ final int dot = fullClassName.lastIndexOf('.');
+ final String className = dot == -1
+ ? fullClassName
+ : fullClassName.substring(dot + 1);
+ final String rootClassName = className.split("\\$")[0];
+ return rootClassName + ".java";
+ }
+
+ @PluginFactory
+ public static @NotNull StacktraceDeobfuscatingRewritePolicy createPolicy() {
+ return new StacktraceDeobfuscatingRewritePolicy();
+ }
+
+ private record ClassMapping(
+ String obfName,
+ String mojangName,
+ Map<Pair<String, String>, MethodMapping> methodMappings
+ ) {
+ }
+
+ private record MethodMapping(
+ String obfName,
+ String mojangName,
+ String descriptor
+ ) {
+ }
+}
diff --git a/src/main/resources/log4j2.xml b/src/main/resources/log4j2.xml
index 67da1aa7a21622fb231d19dede3775a282a4a12e..f91d0df569b2f1d430ea5eee5f53779902a4f32c 100644
--- a/src/main/resources/log4j2.xml
+++ b/src/main/resources/log4j2.xml
@@ -29,15 +29,19 @@
</Policies>
<DefaultRolloverStrategy max="1000"/>
</RollingRandomAccessFile>
+ <Rewrite name="rewrite">
+ <StacktraceDeobfuscatingRewritePolicy />
+ <AppenderRef ref="File"/>
+ <AppenderRef ref="TerminalConsole" level="info"/>
+ <AppenderRef ref="ServerGuiConsole" level="info"/>
+ </Rewrite>
</Appenders>
<Loggers>
<Root level="info">
<filters>
<MarkerFilter marker="NETWORK_PACKETS" onMatch="DENY" onMismatch="NEUTRAL" />
</filters>
- <AppenderRef ref="File"/>
- <AppenderRef ref="TerminalConsole" level="info"/>
- <AppenderRef ref="ServerGuiConsole" level="info"/>
+ <AppenderRef ref="rewrite"/>
</Root>
</Loggers>
</Configuration>