Merge pull request #770 from jgillich/unknown30

add Unknown30 decoder, allow non-advanced packets

src/main/scala/net/psforever/actors/net/MiddlewareActor.scala

@@ -182,7 +182,8 @@ class MiddlewareActor(
   val outQueueBundled: mutable.Queue[PlanetSidePacket] = mutable.Queue()
 
   /** Latest outbound sequence number;
-    * the current sequence is one less than this number */
+    * the current sequence is one less than this number
+    */
   var outSequence = 0
 
   /**
@@ -202,7 +203,8 @@ class MiddlewareActor(
   }
 
   /** Latest outbound subslot number;
-    * the current subslot is one less than this number */
+    * the current subslot is one less than this number
+    */
   var outSubslot = 0
 
   /**
@@ -230,6 +232,7 @@ class MiddlewareActor(
   )
 
   val smpHistoryLength: Int = 100
+
   /** History of created `SlottedMetaPacket`s.
     * In case the client does not register receiving a packet by checking against packet subslot index numbers,
     * it will dispatch a `RelatedA` packet,
@@ -244,19 +247,27 @@ class MiddlewareActor(
 
   /** end of life stat */
   var timesInReorderQueue: Int = 0
+
   /** end of life stat */
   var timesSubslotMissing: Int = 0
+
   /** Delay between runs of the packet bundler/resolver timer (ms);
-    * 250ms per network update (client upstream), so 10 runs of this bundling code every update */
+    * 250ms per network update (client upstream), so 10 runs of this bundling code every update
+    */
   val packetProcessorDelay = Config.app.network.middleware.packetBundlingDelay
+
   /** Timer that handles the bundling and throttling of outgoing packets and resolves disorganized inbound packets */
   var packetProcessor: Cancellable = Default.Cancellable
+
   /** how long packets that are out of sequential order wait for the missing sequence before being expedited (ms) */
   val inReorderTimeout = Config.app.network.middleware.inReorderTimeout
+
   /** Timer that handles the bundling and throttling of outgoing packets requesting packets with known subslot numbers */
   var subslotMissingProcessor: Cancellable = Default.Cancellable
+
   /** how long to wait between repeated requests for packets with known missing subslot numbers (ms) */
   val inSubslotMissingDelay = Config.app.network.middleware.inSubslotMissingDelay
+
   /** how many time to repeat the request for a packet with a known missing subslot number */
   val inSubslotMissingNumberOfAttempts = Config.app.network.middleware.inSubslotMissingAttempts
 
@@ -274,6 +285,13 @@ class MiddlewareActor(
                 send(ServerStart(nonce, serverNonce), None, None)
                 cryptoSetup()
 
+              /** Unknown30 is used to reuse an existing crypto session when switching from login to world
+                * When not handling it, it appears that the client will fall back to using ClientStart
+                * TODO implement this
+                */
+              case (Unknown30(nonce), _) =>
+                connectionClose()
+
               // TODO ResetSequence
               case _ =>
                 log.warn(s"Unexpected packet type $packet in start (before crypto)")
@@ -381,8 +399,7 @@ class MiddlewareActor(
                   )
                   send(ServerFinished(serverChallengeResult))
                   //start the queue processor loop
-                  packetProcessor =
-                    context.system.scheduler.scheduleWithFixedDelay(
+                  packetProcessor = context.system.scheduler.scheduleWithFixedDelay(
                     packetProcessorDelay,
                     packetProcessorDelay
                   )(() => {
@@ -575,8 +592,7 @@ class MiddlewareActor(
       } else if (outQueue.nonEmpty) {
         val bundle = {
           var length = 0L
-          val (_, bundle) = outQueue
-            .dequeueWhile {
+          val (_, bundle) = outQueue.dequeueWhile {
             case (packet, payload) =>
               // packet length + MultiPacketEx header length
               val packetLength = payload.length + (
@@ -598,8 +614,7 @@ class MiddlewareActor(
                 // We deduct some bytes to leave room for SlottedMetaPacket (4 bytes) and MultiPacketEx (2 bytes + prefix per packet)
                 length == packetLength || length <= (MTU - 6) * 8
               }
-            }
-            .unzip
+          }.unzip
           bundle
         }
 
@@ -870,14 +885,14 @@ class MiddlewareActor(
     */
   def askForMissingSubslots(): Unit = {
     if (subslotMissingProcessor.isCancelled) {
-      subslotMissingProcessor =
-        context.system.scheduler.scheduleWithFixedDelay(
+      subslotMissingProcessor = context.system.scheduler.scheduleWithFixedDelay(
         initialDelay = 0.milliseconds,
         inSubslotMissingDelay
       )(() => {
         inSubslotsMissing.synchronized {
           timesSubslotMissing += inSubslotsMissing.size
-            inSubslotsMissing.foreach { case (subslot, attempt) =>
+          inSubslotsMissing.foreach {
+            case (subslot, attempt) =>
               val value = attempt - 1
               if (value > 0) {
                 inSubslotsMissing(subslot) = value

src/main/scala/net/psforever/packet/ControlPacketOpcode.scala

@@ -16,16 +16,37 @@ object ControlPacketOpcode extends Enumeration {
   ClientStart,        // first packet ever sent during client connection
   ServerStart,        // second packet sent in response to ClientStart
   MultiPacket,        // used to send multiple packets with one UDP message (subpackets limited to <= 255)
-  Unknown4, TeardownConnection, Unknown6, ControlSync, // sent to the server from the client
+  Unknown4,           //
+  TeardownConnection, //
+  Unknown6,           //
+  ControlSync,        // sent to the server from the client
   // 0x08
   ControlSyncResp,    // the response generated by the server
-  SlottedMetaPacket0, SlottedMetaPacket1, SlottedMetaPacket2, SlottedMetaPacket3, SlottedMetaPacket4,
-      SlottedMetaPacket5, SlottedMetaPacket6,
+  SlottedMetaPacket0, //
+  SlottedMetaPacket1, //
+  SlottedMetaPacket2, //
+  SlottedMetaPacket3, //
+  SlottedMetaPacket4, //
+  SlottedMetaPacket5, //
+  SlottedMetaPacket6, //
   // OPCODES 0x10-1f
-  SlottedMetaPacket7, RelatedA0, RelatedA1, RelatedA2, RelatedA3, RelatedB0, RelatedB1, RelatedB2,
+  SlottedMetaPacket7, //
+  RelatedA0,          //
+  RelatedA1,          //
+  RelatedA2,          //
+  RelatedA3,          //
+  RelatedB0,          //
+  RelatedB1,          //
+  RelatedB2,          //
   // 0x18
-  RelatedB3, MultiPacketEx, // same as MultiPacket, but with the ability to send extended length packets
-  Unknown26, Unknown27, Unknown28, ConnectionClose, Unknown30 = Value
+  RelatedB3,       //
+  MultiPacketEx,   // same as MultiPacket, but with the ability to send extended length packets
+  Unknown26,       //
+  Unknown27,       //
+  Unknown28,       //
+  ConnectionClose, //
+  Unknown30        // Probably a more lightweight variant of ClientStart, containing only the client nonce
+  = Value
 
   private def noDecoder(opcode: ControlPacketOpcode.Type) =
     (bits: BitVector) => Attempt.failure(Err(s"Could not find a marshaller for control packet $opcode (${bits.toHex})"))
@@ -69,7 +90,7 @@ object ControlPacketOpcode extends Enumeration {
       case 0x1b => noDecoder(Unknown27)
       case 0x1c => noDecoder(Unknown28)
       case 0x1d => control.ConnectionClose.decode
-      case 0x1e => noDecoder(Unknown30)
+      case 0x1e => control.Unknown30.decode
       case _    => noDecoder(opcode)
     }
 

src/main/scala/net/psforever/packet/PSPacket.scala

@@ -63,7 +63,7 @@ object PacketType extends Enumeration(1) {
 }
 
 /** PlanetSide packet flags (beginning of most packets) */
-final case class PlanetSidePacketFlags(packetType: PacketType.Value, secured: Boolean)
+final case class PlanetSidePacketFlags(packetType: PacketType.Value, secured: Boolean, advanced: Boolean = true)
 
 /** Codec for [[PlanetSidePacketFlags]] */
 object PlanetSidePacketFlags extends Marshallable[PlanetSidePacketFlags] {
@@ -71,7 +71,8 @@ object PlanetSidePacketFlags extends Marshallable[PlanetSidePacketFlags] {
     ("packet_type" | PacketType.codec) :: // first 4-bits
       ("unused" | constant(bin"0")) ::
       ("secured" | bool) ::
-      ("advanced" | constant(bin"1")) ::      // we only support "advanced packets"
+      //("advanced" | constant(bin"1")) ::      // we only support "advanced packets"
+      ("advanced" | bool) ::
       ("length_specified" | constant(bin"0")) // we DO NOT support this field
   ).as[PlanetSidePacketFlags]
 }

src/main/scala/net/psforever/packet/PacketCoding.scala

@@ -238,8 +238,7 @@ object PacketCoding {
   def decodePacket(msg: ByteVector): Attempt[PlanetSidePacket] = {
     if (msg.length < PLANETSIDE_MIN_PACKET_SIZE)
       return Failure(Err(s"Packet does not meet the minimum length of $PLANETSIDE_MIN_PACKET_SIZE bytes"))
-    val firstByte = msg { 0 }
-    firstByte match {
+    msg(0) match {
       case 0x00 =>
         // control packets don't need the first byte
         ControlPacketOpcode.codec.decode(msg.drop(1).bits) match {

src/main/scala/net/psforever/packet/control/Unknown30.scala

@@ -0,0 +1,18 @@
+package net.psforever.packet.control
+
+import net.psforever.packet.{ControlPacketOpcode, Marshallable, PlanetSideControlPacket}
+import scodec.Codec
+import scodec.bits._
+import scodec.codecs._
+
+final case class Unknown30(clientNonce: Long) extends PlanetSideControlPacket {
+  type Packet = Unknown30
+  def opcode = ControlPacketOpcode.Unknown30
+  def encode = Unknown30.encode(this)
+}
+
+object Unknown30 extends Marshallable[Unknown30] {
+  implicit val codec: Codec[Unknown30] = (
+    ("client_nonce" | uint32L)
+  ).as[Unknown30]
+}