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| 11:11 |
Zughy[m] |
#12315 can be merged rubenwardy |
| 11:11 |
pgimeno |
https://github.com/minetest/minetest/pull/12315 -- Add world-independent storage directory for mods by rubenwardy |
| 16:34 |
sfan5 |
rubenwardy: did you test #13205 |
| 16:34 |
pgimeno |
https://github.com/minetest/minetest/pull/13205 -- Android: Increase minimum SDK version to 21 by srifqi |
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| 18:41 |
caffblks |
Anyone know the maximum amount of data that may be sent between client and server in a single UDP request? |
| 18:42 |
caffblks |
I'm building a proxy for minetest and want to ensure that I don't have buffer overflows or other issues |
| 18:43 |
sfan5 |
the hard limit is 2^16 but that obviously doesn't fit in a single packet |
| 18:43 |
sfan5 |
(not one sent over the internet that is) |
| 18:45 |
caffblks |
hard limit for UDP datagram is 65507 over IPv4, no? |
| 18:46 |
rubenwardy |
the limit depends on the network, it's called the MTU |
| 18:47 |
caffblks |
I get that. |
| 18:48 |
caffblks |
I'm not concerned about MTU, I'm concerned about maximum payload |
| 18:48 |
caffblks |
(sans fragmentation) |
| 18:49 |
caffblks |
For some reason, my proxy handles the authentication just fine, but whatever happens next before it starts downloading media, that's where it's crashing. |
| 18:58 |
caffblks |
Actually, maximum UDP datagram is 65535 - (60 + 8) = 65467, but from what I can infer from my Googlefu, most people stick to a maximum packet size somewhere between 512 and 8192 bytes. |
| 18:58 |
caffblks |
I currently have a max buffer of 4096, and I'm wondering if that's the issue. |
| 19:07 |
rubenwardy |
are you working at the UDP or Minetest protocol layer |
| 19:11 |
caffblks |
UDP |
| 19:12 |
caffblks |
It's just a basic UDP proxy, essentially. |
| 19:29 |
caffblks |
The recvfrom() function shall return the length of the message written to the buffer pointed to by the buffer argument. For message-based sockets, such as [RS] [Option Start] SOCK_RAW, [Option End] SOCK_DGRAM, and SOCK_SEQPACKET, the entire message shall be read in a single operation. If a message is too long to fit in the supplied buffer, and MSG_PEEK is not set in the flags argument, the excess bytes shall be discarded. |
| 19:30 |
caffblks |
I think that's the problem (see: excess bytes discarded) |
| 19:32 |
caffblks |
I'm so new to c++ I guess there are just things I don't understand yet. I figure if I have my buffers too large, I may add additional latency / overhead as I'm sending excess bytes both directions. That's why I wanted to know what the maximum expected size might be. |
| 19:36 |
sfan5 |
if you proxy the minetest packets transparently it will work |
| 19:37 |
sfan5 |
that it doesn't work is an indicator that you have something wrong, consider a tool like wireshark to see what is actually being sent |
| 19:37 |
caffblks |
Indeed, good idea! |
| 19:44 |
kilbith |
https://github.com/minetest/minetest/pull/13206 |
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