cs16-dm-server: CS 1.6 deathmatch server in Docker

One-command setup (SteamCMD + pinned, checksum-verified ReHLDS / ReGameDLL /
Metamod-R / AMXX / ReAPI / ReUnion / CSDM-ReAPI / YaPB / GunGame), .env
settings, ./cs menu (map, DM/GunGame mode, bots, kill counter, restart,
update), own plugins (extras, rtv, mode switch), all-time kill counter,
watchdog + nightly backup, docs for admins and players.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

rcon

@@ -0,0 +1,55 @@
+#!/usr/bin/env python3
+"""Server console from the terminal (the RCON password never leaves this machine).
+  ./rcon status            one command
+  ./rcon                   interactive prompt (Ctrl+D or 'exit' to quit)
+Reads the port from .env and the password from secrets/rcon-password.txt."""
+import os, socket, sys
+
+D = os.path.dirname(os.path.abspath(__file__))
+env = {}
+for line in open(os.path.join(D, ".env"), encoding="utf-8"):
+    k, _, v = line.strip().partition("=")
+    env[k] = v
+PW = open(os.path.join(D, "secrets", "rcon-password.txt")).read().strip()
+ADDR = ("127.0.0.1", int(env.get("CS_PORT") or 27015))
+H = b"\xff\xff\xff\xff"
+
+
+def rcon(cmd):
+    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    s.settimeout(3)
+    try:
+        s.sendto(H + b"challenge rcon\n", ADDR)
+        ch = s.recvfrom(4096)[0].split()[2]
+    except (OSError, IndexError):
+        return "(no answer: server down or changing map?)"
+    s.sendto(H + b"rcon " + ch + b' "' + PW.encode() + b'" ' + cmd.encode(), ADDR)
+    out = []
+    while True:  # long replies (status, cvarlist) come in several packets
+        try:
+            data = s.recvfrom(65535)[0]
+        except OSError:
+            break
+        out.append(data[5:].decode(errors="replace") if data[:4] == H else data.decode(errors="replace"))
+        s.settimeout(0.4)
+    text = "".join(out)
+    # never show passwords (a map change prints the whole cvar list)
+    return "\n".join(l for l in text.splitlines()
+                     if "rcon_password" not in l and "sv_password" not in l) or "(ok, no output)"
+
+
+if __name__ == "__main__":
+    if len(sys.argv) > 1:
+        print(rcon(" ".join(sys.argv[1:])))
+        sys.exit()
+    print("CS 1.6 console: status, changelevel de_nuke, yb_quota 6, esef_mode gg, say hi. Ctrl+D to quit.")
+    while True:
+        try:
+            line = input("cs16> ").strip()
+        except (EOFError, KeyboardInterrupt):
+            print()
+            break
+        if line in ("exit", "quit"):
+            break
+        if line:
+            print(rcon(line))