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Feature: allow the use of TURN to connect client and server together

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TURN is a last resort, used only if all other methods failed.
TURN is a relay approach to connect client and server together, where
openttd.org (by default) is the middleman.

It is very unlikely either the client or server cannot connect to
the STUN server, as they are both already connected to the Game
Coordinator. But in the odd case it does fail, estabilishing the
connection fails without any further possibility to recover.
This commit is contained in:
Patric Stout
2021-05-05 10:47:01 +02:00
committed by Patric Stout
parent 8a36134003
commit fa1e27994d
21 changed files with 620 additions and 2 deletions
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19
docs/game_coordinator.md
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@@ -62,3 +62,22 @@ server can continue to talk to each other.
Some NAT gateways do not allow this method; for those this attempt will fail,
and this also means that it is not possible to create a connection between
the client and server.
## 3) Via TURN
As a last resort, the Game Coordinator can decide to connect the client and
server together via TURN. TURN is a relay service, relaying the messages
between client and server.
As the client and server can already connect to the Game Coordinator, it is
very likely this is successful.
It is important to note that a relay service has full view of the traffic
send between client and server, and as such it is important that you trust
the relay service used.
For official binaries, this relay service is hosted by openttd.org. The relay
service as hosted by openttd.org only validates it is relaying valid OpenTTD
packets and does no further inspection of the payload itself.
Although in our experience most patch-packs also use the services as offered
by openttd.org, it is possible they use different services. Please be mindful
about this.