Skip to content

Add system property for packet direction validation #1761

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
pop4959 wants to merge 2 commits into from
Closed

Add system property for packet direction validation #1761

Changes from 1 commit
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
6cce036
add system property for packet direction validation
pop4959 Mar 31, 2026
df86ad5
use velocityproperties and default true
pop4959 Apr 1, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
3 changes: 2 additions & 1 deletion proxy/src/main/java/com/velocitypowered/proxy/protocol/netty/MinecraftDecoder.java
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,7 @@ public class MinecraftDecoder extends ChannelInboundHandlerAdapter {
private static final QuietRuntimeException DECODE_FAILED =
new QuietRuntimeException("A packet did not decode successfully (invalid data). For more "
+ "information, launch Velocity with -Dvelocity.packet-decode-logging=true to see more.");
private static final boolean DIRECTION_VALIDATION = Boolean.getBoolean("velocity.packet-direction-validation");
Comment thread
pop4959 marked this conversation as resolved.
Outdated

private final ProtocolUtils.Direction direction;
private StateRegistry state;
Expand Down Expand Up @@ -74,7 +75,7 @@ private void tryDecode(ChannelHandlerContext ctx, ByteBuf buf) throws Exception
MinecraftPacket packet = this.registry.createPacket(packetId);
if (packet == null) {
buf.readerIndex(originalReaderIndex);
if (this.direction == ProtocolUtils.Direction.SERVERBOUND && this.state != StateRegistry.PLAY) {
if (DIRECTION_VALIDATION && this.direction == ProtocolUtils.Direction.SERVERBOUND && this.state != StateRegistry.PLAY) {
buf.release();
throw this.handleInvalidPacketId(packetId);
}
Expand Down