Open-source multiplayer game server compatible with the RuneScape client
https://www.openrs2.org/
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90 lines
2.2 KiB
90 lines
2.2 KiB
package dev.openrs2.bundler.transform;
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import dev.openrs2.asm.InsnMatcher;
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import dev.openrs2.asm.classpath.ClassPath;
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import dev.openrs2.asm.classpath.Library;
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import dev.openrs2.asm.transform.Transformer;
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import org.objectweb.asm.Opcodes;
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import org.objectweb.asm.Type;
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import org.objectweb.asm.tree.ClassNode;
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import org.objectweb.asm.tree.InsnNode;
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import org.objectweb.asm.tree.MethodInsnNode;
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import org.objectweb.asm.tree.MethodNode;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public final class HostCheckTransformer extends Transformer {
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private static final Logger logger = LoggerFactory.getLogger(HostCheckTransformer.class);
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private static final InsnMatcher GET_HOST_MATCHER = InsnMatcher.compile("INVOKEVIRTUAL INVOKEVIRTUAL INVOKEVIRTUAL");
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private int hostChecks;
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@Override
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protected void preTransform(ClassPath classPath) {
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hostChecks = 0;
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}
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@Override
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protected boolean transformCode(ClassPath classPath, Library library, ClassNode clazz, MethodNode method) {
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if (Type.getReturnType(method.desc).getSort() != Type.BOOLEAN) {
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return false;
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}
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GET_HOST_MATCHER.match(method).forEach(match -> {
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var insn1 = (MethodInsnNode) match.get(0);
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if (!insn1.owner.equals(clazz.name)) {
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return;
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}
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if (!insn1.name.equals("getDocumentBase")) {
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return;
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}
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if (!insn1.desc.equals("()Ljava/net/URL;")) {
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return;
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}
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var insn2 = (MethodInsnNode) match.get(1);
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if (!insn2.owner.equals("java/net/URL")) {
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return;
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}
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if (!insn2.name.equals("getHost")) {
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return;
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}
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if (!insn2.desc.equals("()Ljava/lang/String;")) {
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return;
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}
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var insn3 = (MethodInsnNode) match.get(2);
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if (!insn3.owner.equals("java/lang/String")) {
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return;
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}
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if (!insn3.name.equals("toLowerCase")) {
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return;
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}
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if (!insn3.desc.equals("()Ljava/lang/String;")) {
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return;
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}
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method.instructions.clear();
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method.tryCatchBlocks.clear();
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method.instructions.add(new InsnNode(Opcodes.ICONST_1));
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method.instructions.add(new InsnNode(Opcodes.IRETURN));
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hostChecks++;
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});
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return false;
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}
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@Override
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protected void postTransform(ClassPath classPath) {
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logger.info("Removed {} host checks", hostChecks);
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}
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}
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