78 lines
3.2 KiB
Markdown
78 lines
3.2 KiB
Markdown
# etrelay
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UDP relay + master heartbeat for the Wolfenstein: Enemy Territory server, running on the front server (replaces its UDP 27960 DNAT rule / nginx `stream` block).
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```
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players / masters ──> front :27960 (etrelay) ══wg══> 10.66.0.10:27960 (nginx stream) ──> ET 10.0.1.103:27960
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```
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- **Proxy**: one upstream socket per client address, packets forwarded as-is both ways, session dropped after 2 min of silence.
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- **Heartbeat**: every 5 min, `getinfo` to the ET server; if it answers, `heartbeat EnemyTerritory-1` to the masters **from the public socket**. When it stops answering, one `heartbeat ETFlatline-1`.
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Masters check (`getChallenge`, `getInfo`) the address the heartbeat came from: the public `:27960`. Those packets go through the relay like any client, the ET server answers them, and the master lists the front public address.
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How it works in detail, with diagrams: [ENGINE.md](ENGINE.md).
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## Usage
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```bash
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etrelay <UPSTREAM> [--listen 0.0.0.0:27960] [--master host:port]... [--debug]
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```
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Default masters: `etmaster.idsoftware.com:27950` (id Software, the one ET 2.60b clients query) and `etmaster.net:27950` (ET: Legacy community). Passing `--master` replaces both.
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`--debug` logs sessions (open/close, packet counts), connectionless packets by command name only (`getinfo`, `getstatus`, `connect`...: no arguments, `connect` carries the userinfo), probes and heartbeats. In-game packets are only counted.
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```
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probe 10.66.0.10:27960: up
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ET server 10.66.0.10:27960 is up
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heartbeat EnemyTerritory-1 -> etmaster.net:27950 (91.220.53.121:27950)
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session + 91.220.53.121:27950 (2 active)
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91.220.53.121:27950 -> ET getChallenge (27 B)
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91.220.53.121:27950 <- ET challengeResponse (32 B)
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91.220.53.121:27950 -> ET getInfo (22 B)
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91.220.53.121:27950 <- ET infoResponse (303 B)
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session - <player>:27960: 5321 packets to ET, 4876 from ET
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```
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Deploy with it: `make deploy ARGS=--debug`, back to normal with `make deploy`.
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## Build
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```bash
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make build # dynamic (glibc)
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make static # static (musl), runs on any x86_64 Linux
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make release # both
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```
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Artifacts land in `dist/`, named `<name>-v<version>-<target triple>` with a `.sha256` checksum:
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```
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dist/etrelay-v0.1.0-x86_64-unknown-linux-gnu # dynamic
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dist/etrelay-v0.1.0-x86_64-unknown-linux-musl # static
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```
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## Deploy
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1. Relay (static binary + systemd unit on `ionos`): `make deploy`
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2. Front: remove what captured UDP 27960 before etrelay, or players bypass it:
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- the DNAT rule (`PostUp`/`PostDown` in `/etc/wireguard/wg0.conf`, then `wg-quick down wg0 && wg-quick up wg0`); `iptables -t nat -S | grep 27960` must print nothing
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- the nginx `stream` block (`proxy/nginx/nginx.conf` in the `pve` repo): `make -C proxy deploy-nginx` from there
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3. ET server `server.cfg`: stop its own heartbeats, they leave through the home box with the wrong IP:
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```
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set sv_master1 ""
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set sv_master2 ""
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set sv_master3 ""
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set sv_master4 ""
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set sv_master5 ""
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```
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## Check
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```bash
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make logs # "ET server ... is up"
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ssh ionos tcpdump -ni any udp port 27950 # heartbeat out, getChallenge/getInfo in, answers out
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```
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The server then shows up on the master (in-game server browser).
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