Open-source multiplayer game server compatible with the RuneScape client
https://www.openrs2.org/
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102 lines
3.4 KiB
102 lines
3.4 KiB
package org.openrs2.patcher.transform
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import com.github.michaelbull.logging.InlineLogger
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import org.objectweb.asm.Opcodes
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import org.objectweb.asm.tree.ClassNode
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import org.objectweb.asm.tree.FieldInsnNode
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import org.objectweb.asm.tree.InsnList
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import org.objectweb.asm.tree.InsnNode
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import org.objectweb.asm.tree.IntInsnNode
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import org.objectweb.asm.tree.JumpInsnNode
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import org.objectweb.asm.tree.LdcInsnNode
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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.objectweb.asm.tree.VarInsnNode
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import org.openrs2.asm.InsnMatcher
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import org.openrs2.asm.classpath.ClassPath
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import org.openrs2.asm.classpath.Library
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import org.openrs2.asm.transform.Transformer
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import javax.inject.Singleton
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@Singleton
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public class InvalidKeyTransformer : Transformer() {
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private var catchBlocks = 0
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override fun preTransform(classPath: ClassPath) {
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catchBlocks = 0
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}
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override fun transformCode(classPath: ClassPath, library: Library, clazz: ClassNode, method: MethodNode): Boolean {
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for (match in MATCHER.match(method)) {
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val ldc = if (match[8] is LdcInsnNode) {
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match[8]
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} else {
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match[9]
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} as LdcInsnNode
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if (ldc.cst != "T3 - ") {
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continue
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}
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val uncompressedStore = match[2] as VarInsnNode
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val goto = match[3] as JumpInsnNode
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val exLoad = match[5]
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val invokeWrap = match[match.size - 2]
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val exThrow = match[match.size - 1]
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/*
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* Replace:
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*
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* } catch (RuntimeException ex) {
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* throw TracingException.wrap(ex, "T3 - " + ...);
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* }
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*
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* with:
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*
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* } catch (RuntimeException ex) {
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* System.out.println("T3 - " + ...);
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* uncompressed = new byte[] { 0 };
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* }
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*/
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val list = InsnList()
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list.add(FieldInsnNode(Opcodes.GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;"))
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list.add(InsnNode(Opcodes.SWAP))
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list.add(MethodInsnNode(Opcodes.INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V"))
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list.add(InsnNode(Opcodes.ICONST_1))
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list.add(IntInsnNode(Opcodes.NEWARRAY, Opcodes.T_BYTE))
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list.add(InsnNode(Opcodes.DUP))
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list.add(InsnNode(Opcodes.ICONST_0))
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list.add(InsnNode(Opcodes.ICONST_0))
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list.add(InsnNode(Opcodes.BASTORE))
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list.add(VarInsnNode(Opcodes.ASTORE, uncompressedStore.`var`))
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list.add(JumpInsnNode(Opcodes.GOTO, goto.label))
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method.instructions.remove(exLoad)
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method.instructions.insertBefore(invokeWrap, list)
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method.instructions.remove(invokeWrap)
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method.instructions.remove(exThrow)
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catchBlocks++
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}
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return false
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}
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override fun postTransform(classPath: ClassPath) {
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logger.info { "Made $catchBlocks invalid key catch blocks non-fatal" }
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}
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private companion object {
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private val logger = InlineLogger()
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private val MATCHER = InsnMatcher.compile(
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"""
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ALOAD INVOKESTATIC ASTORE GOTO ASTORE ALOAD NEW DUP INVOKESPECIAL? LDC .*? INVOKESTATIC ATHROW
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""".trimIndent()
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)
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}
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}
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