Save/load game bug?

[Zgokee]

Hello, I was playing a solo map, SL1, on a USA server some time back. I decided to take a break because i was stuck on a part. So, few days later I wanted to finish it. I join a USA server and type in the great /load command as i usually do. I get an error saying, "You have to be on the 'GER' server to load this savegame." Hm, i am pretty i played a two player map afterwards i thought with a friend. Oh well, thought nothing of it. Maybe i am going crazy. Today, Dinner had the same problem with a different solo map.

Is there a legitimate reason for this?

Thanks in advance.

[laxa]

An exploit was found with save/load, and the only solution deen found so far is to let save/load only on ger afaik.

[deen]

Indeed, there was an exploit using savegames. The solution is that you can only load on the server where you saved (same country). Unfortunately I didn't record this information before, so I had to set GER as the default server. To restore your savegame on USA:
1. go to a GER server and /load MYCODE
2. /save USA MYCODE
3. go to a USA server and /load MYCODE

[Zgokee]

That is interesting. Would you mind explaining the exploit?
Thank you for the solution deen!

[laxa]

If I understood it correctly, the exploit is like that :

- save at some point of the run
- wait for the save to be spread to another server
- then you can load the save on 2 different servers
- you can then multiply your saves

Servers = different country server.

[Grim_Fandango]

If we have to go through this, could we at least get a list of the codes DDNet recognizes for the different countries...? >.>

On South African servers for example, I've tried getting mine over using "/save SA xyz" and it just saves as "SA xyz". "/save South Africa xyz" doesn't work either.

[deen]

If we have to go through this, could we at least get a list of the codes DDNet recognizes for the different countries...? >.>

On South African servers for example, I've tried getting mine over using "/save SA xyz" and it just saves as "SA xyz". "/save South Africa xyz" doesn't work either.

Yeah, I'm really sorry. The only choice was to do this or disable save altogether. The codes for each country are the 3 letter codes, so ZAF for South Africa, also GER, USA, RUS, CAN, CHN, CHL, BRA.

[HMH]

If I got this right it is a problem about sql-access, is it not ? Well, if it is I think I know how to fix it.

[deen]

If I got this right it is a problem about sql-access, is it not ? Well, if it is I think I know how to fix it.

On most DDNet countries a separate MariaDB (MySQL) database is running. They are all connected in a big replication circle. When you make a save it is stored on your country's database first, then replicated to the other ones. When you load, the same happens, but with a remove instead of add. So this is how they cheated: They went to 2 separate countries at the same time which have quite some ping between them, and loaded the save on both at the same time. Now they have made 2 saves from 1 and can try the map twice from that position. Great for cheating faily maps. Can be repeated to get more than 2 saves.

[Grim_Fandango]

If we have to go through this, could we at least get a list of the codes DDNet recognizes for the different countries...? >.>

On South African servers for example, I've tried getting mine over using "/save SA xyz" and it just saves as "SA xyz". "/save South Africa xyz" doesn't work either.

Yeah, I'm really sorry. The only choice was to do this or disable save altogether. The codes for each country are the 3 letter codes, so ZAF for South Africa, also GER, USA, RUS, CAN, CHN, CHL, BRA.

Ah, thanks deen!