DDraceNetwork - developer

It seems players have some sort of script they use to attack the servers... Their ping ramps up to ~600 then to 999 and the lag is unbearable, it's killing the fun in the Brazil servers; BUT if the players can somehow vote-kick the player with 999 ping, everything goes back to normal in a matter of seconds. This effect has been well known by players in the servers I play in for a while now, but it's hard to vote-kick the player because after the attack starts the server is very slow to respond so the vote-kick ends before people can react to it; and most players just close the game, leaving behind their ghosts that don't vote. But looking at that attack behavior, I assume it's very likely that it's a denial of service exploiting actual game packets, and not DDOS (as in multiple IPs attacking), neither a normal UDP flood since kicking them from the game wouldn't stop that (unless kicking a player adds their IP to an iptables filter, and I very much doubt that). Shouldn't it be possible to detect such attacks and kick the player automatically, inside the server code? Or maybe a setting to kick any player with obscenely high ping? I know I could probably do this on my own server, but wouldn't it be reasonable to have something like this on the official servers?... It just feels like this denial-of-service exploit script has reached a lot of hands, the servers are attacked so much that the game is not as popular as it should be... And they even often brag about it: "touch me and I lag the server" and such (got pictures but I don't think it's relevant to this conversation).

03:34

Also hypothetically: if I open a "bait" server, leave it on with tcpdump or WireShark registering the traffic flow and HOPE somebody runs this particular attack on it, then pinpoint how the attack works, would a Dev possibly see that and go for a fix?

03:34

Or are my assumptions just wrong?

03:35

Cute cat for posting a wall of text:

03:35

ddnet-maps

[ddnet-maps:master] 1 new commit

32d6a66 M NUT_race2 - ddnet-maps

@Curvelo official ddnet servers are only affected by ddos, here is a blog written by deen about it https://hookrace.net/blog/dos-attacks-against-online-game/

05:09

note that there were maybe 2 more tries to solve the issue since then, for example the ger10 whitelist servers, I myself don't know how effective that approach turned out

I think he's right it's not a ddos. Wasn't there an issue with emote spam lagging the server? It could be similar

Curvelo

It seems players have some sort of script they use to attack the servers... Their ping ramps up to ~600 then to 999 and the lag is unbearable, it's killing the fun in the Brazil servers; BUT if the players can somehow vote-kick the player with 999 ping, everything goes back to normal in a matter of seconds. This effect has been well known by players in the servers I play in for a while now, but it's hard to vote-kick the player because after the attack starts the server is very slow to respond so the vote-kick ends before people can react to it; and most players just close the game, leaving behind their ghosts that don't vote. But looking at that attack behavior, I assume it's very likely that it's a denial of service exploiting actual game packets, and not DDOS (as in multiple IPs attacking), neither a normal UDP flood since kicking them from the game wouldn't stop that (unless kicking a player adds their IP to an iptables filter, and I very much doubt that). Shouldn't it be possible to detect such attacks and kick the player automatically, inside the server code? Or maybe a setting to kick any player with obscenely high ping? I know I could probably do this on my own server, but wouldn't it be reasonable to have something like this on the official servers?... It just feels like this denial-of-service exploit script has reached a lot of hands, the servers are attacked so much that the game is not as popular as it should be... And they even often brag about it: "touch me and I lag the server" and such (got pictures but I don't think it's relevant to this conversation).

Can u record a demo of the attacker next time it happens

Or ping a admin to make a traffic dump

06:43

@Jupstar ✪ friday rust

Ryozuki

@Jupstar ✪ friday rust

True, yesterday I also had a question ready. I hope I remember it soon

im remaking my kernel

06:44

i need to learn GOP if i use uefi

06:45

https://wiki.osdev.org/GOP

@Ryozuki have u ever worked with lock free structures in rust?

atomics? xd

06:57

but i think not

06:57

dont rly know much about them

Yeah atomic maps or stacks

they usually use linked lists?

06:57

idk

Yep they are

dashmap

06:58

is a good hashmap

Ever worked with explicit spinlocks in rust?

for mt

06:58

u use a spinlock in the kernel dev

06:58

there is a good read for u

06:59

https://marabos.nl/atomics/

Rust Atomics and Locks by Mara Bos

Low-level Concurrency in Practice. This practical book helps Rust programmers of all levels gain a clear understanding of low-level concurrency. You'll learn everything about atomics and …