Open-source multiplayer game server compatible with the RuneScape client https://www.openrs2.org/
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openrs2/bundler/src/main/java/org/openrs2/bundler/transform/HostCheckTransformer.kt

69 lines
2.2 KiB

package org.openrs2.bundler.transform
import com.github.michaelbull.logging.InlineLogger
import org.objectweb.asm.Opcodes
import org.objectweb.asm.Type
import org.objectweb.asm.tree.ClassNode
import org.objectweb.asm.tree.InsnNode
import org.objectweb.asm.tree.MethodInsnNode
import org.objectweb.asm.tree.MethodNode
import org.openrs2.asm.InsnMatcher
import org.openrs2.asm.classpath.ClassPath
import org.openrs2.asm.classpath.Library
import org.openrs2.asm.transform.Transformer
import javax.inject.Singleton
@Singleton
public class HostCheckTransformer : Transformer() {
private var hostChecks = 0
override fun preTransform(classPath: ClassPath) {
hostChecks = 0
}
override fun transformCode(classPath: ClassPath, library: Library, clazz: ClassNode, method: MethodNode): Boolean {
if (Type.getReturnType(method.desc).sort != Type.BOOLEAN) {
return false
}
for (match in GET_HOST_MATCHER.match(method)) {
val insn1 = match[0] as MethodInsnNode
if (insn1.owner != clazz.name || insn1.name != "getDocumentBase" || insn1.desc != "()Ljava/net/URL;") {
continue
}
val insn2 = match[1] as MethodInsnNode
if (insn2.owner != "java/net/URL" || insn2.name != "getHost" || insn2.desc != "()Ljava/lang/String;") {
continue
}
val insn3 = match[2] as MethodInsnNode
if (
insn3.owner != "java/lang/String" ||
insn3.name != "toLowerCase" ||
insn3.desc != "()Ljava/lang/String;"
) {
continue
}
method.instructions.clear()
method.tryCatchBlocks.clear()
method.instructions.add(InsnNode(Opcodes.ICONST_1))
method.instructions.add(InsnNode(Opcodes.IRETURN))
hostChecks++
}
return false
}
override fun postTransform(classPath: ClassPath) {
logger.info { "Removed $hostChecks host checks" }
}
private companion object {
private val logger = InlineLogger()
private val GET_HOST_MATCHER = InsnMatcher.compile("INVOKEVIRTUAL INVOKEVIRTUAL INVOKEVIRTUAL")
}
}