Enet (2026's edition)

[ohlidalp]

An experimental RoRnet upgrade to use UDP packets (instead of TCP packets) via popular ENet library.
RoRserver counterpart: RigsOfRods/ror-server#143

Features:

• backward compatibility with older rorservers - first connection is made via TCP (socketw) as usual to check version.
• actor-actor collisions via additional RoRnet stream containing collision forces (not lag-compensated yet).
• character-actor sticky collision: character can walk on cabs of moving networked actor
• extended MP ClientList UI showing net traffic graphs.

[Zentro]

Trying to get this to start.. Fedora Linux 44

After compiling, I tried to run rorserver and saw:

26-07-2026 01:08:52|t140167781660544|ERROR|Failed to create ENet server host.

But this didn't cause the server to sigkill, it kept going. It seems the listener thread started.

I connected anyways with a TCP client, and saw "error getting server version" with this in the logs:

26-07-2026 01:15:24|t140695771834048|VERBO|Listener got a new connection
26-07-2026 01:15:24|t140695771834048|ERROR|SWReceiveMessage(): payload too long: 1850896210 b (max. is 8192 b)
26-07-2026 01:15:24|t140695771834048|ERROR|ERROR Listener: receiving first message
26-07-2026 01:15:24|t140695771834048|VERBO|Listener awaiting connections

Then, I connected with a valid UDP client and saw "Connecting via UDP" with:

26-07-2026 01:31:06|t140574239315648|VERBO|Listener got a new connection
26-07-2026 01:31:06|t140574239315648|VERBO|Listener awaiting connections

But enet isn't initialized, so we're just stuck trying to connect until it eventually fails.

Unrelated for RoR server, but the annoying "foreground" feature causes a coredump. I can remove this in a separate PR.

--- edit ---

Inspected errno with:

diff --git a/source/server/dispatcher_enet.cpp b/source/server/dispatcher_enet.cpp
index edc037c..03f97eb 100644
--- a/source/server/dispatcher_enet.cpp
+++ b/source/server/dispatcher_enet.cpp
@@ -7,6 +7,9 @@
 
 #include <cassert>
 
+#include <cerrno>
+#include <cstring>
+
 void DispatcherENet::Initialize()
 {
     // Make sure it's not started twice
@@ -41,7 +44,7 @@ void DispatcherENet::Initialize()
                               0      /* assume any amount of outgoing bandwidth */);
     if (m_host == nullptr)
     {
-        Logger::Log(LOG_ERROR, "Failed to create ENet server host.");
+        Logger::Log(LOG_ERROR, "Failed to create ENet server host: %s", std::strerror(errno));
         return;
     }
     else
@@ -201,4 +204,4 @@ void DispatcherENet::QueueMessage(ENetPeer *peer, int type, int source, unsigned
     ENetPacket* packet = enet_packet_create(buffer, msgsize, packet_flags);
     enet_peer_send(peer, 0, packet);
     Messaging::StatsAddOutgoing(msgsize);
-}
\ No newline at end of file
+}

which noted:

26-07-2026 01:39:06|t140626541614976|ERROR|Failed to create ENet server host: Cannot assign requested address

So I set forced my IP to be local (seems trying to fetch the IP from an HTTP call is bad, should probably stop that) and now it works!

Users disconnect cleanly.