DumpTransferPacket.js

//frida-trace -U -i "_ZN14TransferPacket4readER12BinaryStream" com.mojang.minecraftpe
//Tested on MCPE 1.1.4
{
	onEnter: function(log, args, state) {
		this.ptr = args[0];
	},
	onLeave: function(log, retval, state) {
		realAddr = Memory.readPointer(this.ptr.add(12));
		rlen = Memory.readU32(realAddr.sub(12));
		uint8arr = new Uint8Array(Memory.readByteArray(realAddr, rlen));
		var string = String.fromCharCode.apply(null, uint8arr),
			host = decodeURIComponent(escape(string));
		console.log(host + ':' + Memory.readU16(this.ptr.add(16)));
	}
}