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https://github.com/PaperMC/Paper.git
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Address todos
This commit is contained in:
Jason Penilla
parent
be53945cc0
commit
dafde7ed62
@ -6,31 +6,42 @@ Subject: [PATCH] Modify library loader jars bytecode
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diff --git a/src/main/java/io/papermc/paper/plugin/entrypoint/classloader/BytecodeModifyingURLClassLoader.java b/src/main/java/io/papermc/paper/plugin/entrypoint/classloader/BytecodeModifyingURLClassLoader.java
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new file mode 100644
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index 0000000000000000000000000000000000000000..acd24b8d32b5debd987f463c0be0ac6bdfdd061f
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index 0000000000000000000000000000000000000000..405416dc3d1c8c58b4e0c880d8751ca319188f62
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--- /dev/null
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+++ b/src/main/java/io/papermc/paper/plugin/entrypoint/classloader/BytecodeModifyingURLClassLoader.java
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@@ -0,0 +1,116 @@
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@@ -0,0 +1,185 @@
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+package io.papermc.paper.plugin.entrypoint.classloader;
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+
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+import io.papermc.paper.pluginremap.reflect.ReflectionRemapper;
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+import java.io.IOException;
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+import java.io.InputStream;
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+import java.io.UncheckedIOException;
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+import java.net.JarURLConnection;
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+import java.net.URL;
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+import java.net.URLClassLoader;
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+import java.security.CodeSigner;
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+import java.security.CodeSource;
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+import java.util.Map;
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+import java.util.concurrent.ConcurrentHashMap;
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+import java.util.function.Function;
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+import java.util.jar.Attributes;
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+import java.util.jar.Manifest;
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+import org.checkerframework.checker.nullness.qual.Nullable;
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+import org.objectweb.asm.ClassReader;
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+import org.objectweb.asm.ClassVisitor;
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+import org.objectweb.asm.ClassWriter;
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+
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+import static java.util.Objects.requireNonNullElse;
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+
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+public final class BytecodeModifyingURLClassLoader extends URLClassLoader {
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+ static {
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+ ClassLoader.registerAsParallelCapable();
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+ }
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+
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+ private static final Object MISSING_MANIFEST = new Object();
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+
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+ private final Function<byte[], byte[]> modifier;
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+ private final Map<String, Object> manifests = new ConcurrentHashMap<>();
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+
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+ public BytecodeModifyingURLClassLoader(
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+ final URL[] urls,
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@ -65,20 +76,8 @@ index 0000000000000000000000000000000000000000..acd24b8d32b5debd987f463c0be0ac6b
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+ if (url != null) {
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+ try {
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+ result = this.defineClass(name, url);
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+ } catch (IOException e) {
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+ } catch (final IOException e) {
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+ throw new ClassNotFoundException(name, e);
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+ } catch (ClassFormatError e2) {
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+ /* TODO
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+ try {
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+ final Throwable dataError = (Throwable) GET_DATA_ERROR.invoke(res);
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+ if (dataError != null) {
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+ e2.addSuppressed(dataError);
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+ }
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+ } catch (final ReflectiveOperationException e) {
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+ throw new RuntimeException(e);
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+ }
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+ */
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+ throw e2;
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+ }
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+ } else {
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+ result = null;
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@ -94,26 +93,24 @@ index 0000000000000000000000000000000000000000..acd24b8d32b5debd987f463c0be0ac6b
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+ if (i != -1) {
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+ String pkgname = name.substring(0, i);
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+ // Check if package already loaded.
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+ Manifest man = null; // (Manifest) GET_MANIFEST.invoke(res); TODO
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+ //if (GET_AND_VERIFY_PKG.invoke(this, pkgname, man, url) == null) { // todo
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+ final @Nullable Manifest man = this.manifestFor(url);
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+ if (this.getAndVerifyPackage(pkgname, man, url) == null) {
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+ try {
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+ if (man != null) {
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+ definePackage(pkgname, man, url);
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+ this.definePackage(pkgname, man, url);
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+ } else {
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+ definePackage(pkgname, null, null, null, null, null, null, null);
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+ this.definePackage(pkgname, null, null, null, null, null, null, null);
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+ }
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+ } catch (IllegalArgumentException iae) {
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+ // parallel-capable class loaders: re-verify in case of a
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+ // race condition
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+ /* TODO
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+ if (GET_AND_VERIFY_PKG.invoke(this, pkgname, man, url) == null) {
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+ if (this.getAndVerifyPackage(pkgname, man, url) == null) {
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+ // Should never happen
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+ throw new AssertionError("Cannot find package " +
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+ pkgname);
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+ }
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+ */
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+ }
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+ //} // todo
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+ }
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+ }
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+ final byte[] bytes;
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+ try (final InputStream is = url.openStream()) {
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@ -123,7 +120,79 @@ index 0000000000000000000000000000000000000000..acd24b8d32b5debd987f463c0be0ac6b
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+ final byte[] modified = this.modifier.apply(bytes);
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+
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+ final CodeSource cs = new CodeSource(url, (CodeSigner[]) null);
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+ return defineClass(name, modified, 0, modified.length, cs);
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+ return this.defineClass(name, modified, 0, modified.length, cs);
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+ }
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+
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+ private Package getAndVerifyPackage(
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+ String pkgname,
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+ Manifest man, URL url
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+ ) {
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+ Package pkg = getDefinedPackage(pkgname);
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+ if (pkg != null) {
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+ // Package found, so check package sealing.
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+ if (pkg.isSealed()) {
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+ // Verify that code source URL is the same.
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+ if (!pkg.isSealed(url)) {
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+ throw new SecurityException(
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+ "sealing violation: package " + pkgname + " is sealed");
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+ }
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+ } else {
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+ // Make sure we are not attempting to seal the package
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+ // at this code source URL.
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+ if ((man != null) && this.isSealed(pkgname, man)) {
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+ throw new SecurityException(
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+ "sealing violation: can't seal package " + pkgname +
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+ ": already loaded");
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+ }
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+ }
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+ }
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+ return pkg;
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+ }
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+
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+ private boolean isSealed(String name, Manifest man) {
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+ Attributes attr = man.getAttributes(name.replace('.', '/').concat("/"));
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+ String sealed = null;
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+ if (attr != null) {
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+ sealed = attr.getValue(Attributes.Name.SEALED);
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+ }
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+ if (sealed == null) {
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+ if ((attr = man.getMainAttributes()) != null) {
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+ sealed = attr.getValue(Attributes.Name.SEALED);
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+ }
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+ }
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+ return "true".equalsIgnoreCase(sealed);
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+ }
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+
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+ private @Nullable Manifest manifestFor(final URL url) throws IOException {
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+ Manifest man = null;
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+ if (url.getProtocol().equals("jar")) {
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+ try {
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+ final Object computedManifest = this.manifests.computeIfAbsent(jarName(url), $ -> {
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+ try {
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+ final Manifest m = ((JarURLConnection) url.openConnection()).getManifest();
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+ return requireNonNullElse(m, MISSING_MANIFEST);
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+ } catch (final IOException e) {
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+ throw new UncheckedIOException(e);
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+ }
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+ });
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+ if (computedManifest instanceof Manifest found) {
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+ man = found;
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+ }
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+ } catch (final UncheckedIOException e) {
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+ throw e.getCause();
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+ } catch (final IllegalArgumentException e) {
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+ throw new IOException(e);
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+ }
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+ }
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+ return man;
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+ }
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+
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+ private static String jarName(final URL sourceUrl) {
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+ final int exclamationIdx = sourceUrl.getPath().lastIndexOf('!');
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+ if (exclamationIdx != -1) {
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+ return sourceUrl.getPath().substring(0, exclamationIdx);
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+ }
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+ throw new IllegalArgumentException("Could not find jar for URL " + sourceUrl);
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+ }
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+}
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diff --git a/src/main/java/io/papermc/paper/plugin/loader/PaperClasspathBuilder.java b/src/main/java/io/papermc/paper/plugin/loader/PaperClasspathBuilder.java
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