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2 commits

Author SHA1 Message Date
heinrich5991 4fb050ccb7 Use STUN to determine UDP connectivity and show diagnostics
These diagnostics are supposed to guide the user to problem resolution.
They're displayed if no packet is received from the server within one
second of connecting.

No message if we don't have STUN servers.

"Trying to determine UDP connectivity..." if no answer has been received
from the STUN server yet and it hasn't timed out yet.

"UDP seems to be filtered." if the STUN request has timed out.

"UDP and TCP IP addresses seem to be different. Try disabling VPN,
proxy or network accelerators." if the STUN request has returned an IP
address different from the one obtained via HTTP from info2.ddnet.tw.

"No answer from server yet." otherwise, if the STUN request has returned
no interesting data, indicating that it's likely the game server's
fault.
2022-05-18 09:21:31 +02:00
heinrich5991 ec45a7338a Add bare-bones STUN protocol support
Implemented according to RFC 5389.
2022-05-18 09:20:54 +02:00