A whole pose from a dedicated server opened a stream under any of its
65,536 numbers, and each stream kept its last 32 poses. Streams were only
dropped once their player had left, so a sender that opened one under
every number for a player who was there (itself) made the receiver keep
millions of poses. Sound streams were open the same way.
- pose_batch::open_stream: a player's new stream ends their old one, and
no more than 512 streams are held (twice the player limit); both the
pose and sound receivers open streams only through it.
- A stream is opened only for a player in the session. A refused whole
pose is not acked, so a real server sends it again; sound is sent whole
every couple of seconds.
- Tests: the reported flood leaves one stream for one player and 512 for
65,535; the same for sound, and only admitted players open a stream.
- mesh_tests: HookBatch stubbed, which the session uses since the freeze
fixes; the test had stopped linking.
A hacked client could move its skater's bones anywhere and stretch the
skater across the map for everyone: the server limited a bone's scale
but not its place.
Server: new anti_cheat setting bone_reach_limit, default 1 metre (0.5
to 20, 0 for off; console bone-reach <0.5-20>|off). A body or board
bone further than that from its parent is pulled back before the pose
is passed on. On the game's rig these bones never move (the longest, a
thigh, is 0.44 m). The fourteen skater bones that do move by metres
(they follow the board and the body in a fall) are held to 100 m, and
the board's rig to 5 m from the board.
Client: every pose a game is shown is held to 2 m reach and 8x bone
scale, whoever sent it, which covers servers that have not updated and
sessions without a dedicated server. A client used to accept up to
100x scale.
The limits come from two recorded play sessions; the exempt bones are
picked by index for the current build's 395-bone rig. The pose codec
bench now prints each recording's bone reach, and reads recordings made
by earlier versions.
Costume crash: the skater scripts' item:addEsShaderPreset uses the
preset it is handed without checking that it is loaded, and the game
crashed in the material's construction shortly after arriving on a
server's map while wearing a modded costume. The call is now checked
first: an item whose preset is not there is shown without it, and the
log says so.
Stuck close: once the player closes the game, a watch starts. If the
window has gone or stopped answering and the process is still there
8 seconds later, the process is ended. A window that still answers
(the close was turned down) is left alone, and the watch stands down
after two minutes.
Level unload guard: switched off. Skipping the entry that crashed left
its reference registered, so leaving the level never finished and the
game hung with the world unloaded. The crash it covered is back until
the reference is released properly.
Poses and skater sound between a dedicated server and its players use new
formats. Lobbies and the links between games are unchanged.
Poses (pose_codec.h, pose_batch.h):
- A pose is rounded once (rotations to 0.08 degrees, positions to a
millimetre) and sent as its differences from a pose of the same player
the receiver has acknowledged. Several players' poses share one message.
- The receiver acknowledges messages once a tick; the sender builds only on
acknowledged poses, or on the whole pose it sent reliably. Loss costs the
poses in that packet and nothing more.
- Fingers are not sent to players further than "finger_distance" (25 m).
- Games upload their own poses the same way, and the server acknowledges.
- About 300 B a pose at full rate against about 660 B before.
- The server no longer rounds rotations by distance: it saved little.
Sound (sound_codec.h):
- Each sample is sent as what changed since the one before, numbers rounded
to 1/1024. One reliable message a tick carries every skater a player can
hear. A stream is sent whole at its start and every two seconds.
- About 106 B a message against 368 B before, on a recording of real play.
Direct connections:
- "connection": "relay" (default) or "direct", with "direct_address" and
"direct_port". A direct server listens on UDP and is listed with its
address; players still sign in through Steam.
- Games connect straight to servers that offer it and fall back to the
relays after 5 s. Setting and "mp direct-connections" to turn it off.
Server:
- "bone_scale_limit" is 1 by default: resized body parts are off unless a
server allows them.
- Logs Steam's relay network status at start-up and in "net", and watches
the Steam sign-in.
- "pack_ms" (10): how long Steam may hold a message to pack it with others.
- "steam_debug": logs what Steam's networking says, for connection faults.
- "relay_everything": sends poses and sound through the server even between
games that have linked, for testing with few players.
- "net" shows pose sizes by rate, the share sent without fingers, and whole
poses sent.
Game:
- Only ReSkate's nametags are shown; the game's own are removed.
- "mp pose-dump <seconds>" records the local skater's poses and sound.
Tests: pose_codec_tests covers exact round trips, chains of differences,
held fingers, damaged input, the sender and receiver over a link that
delays, loses and reorders, and the sound format; with a recording as its
argument it prints sizes on real play.
Protocol 44: servers and games must both update.
AyeZeeBB