image/base: Create console input socket

This socket forwards any input to the server console directly.

Usage from outside:
  echo "my server command" | nc -UN /tmp/steamcmd/console.sock

The OpenBSD version of netcat is required for that to work (I believe).

Signed-off-by: Timo Reichl <[email protected]>

README.md

@@ -10,6 +10,7 @@ https://github.com/thetredev/steamcmd/assets/6085219/b7b807c0-3459-4522-89ed-343
 # Table of Contents
 - [Differences to official images](#differences-to-official-images)
   - [tmux session socket](#tmux-session-socket)
+  - [console input socket](#console-input-socket)
   - [Base image](#base-image)
   - [SSH server](#ssh-server)
 - [HLDS image](#hlds-image)
@@ -60,6 +61,27 @@ tmux -S /tmp/steamcmd/tmux.sock send-keys "bot_kick" "Enter"
 
 Unfortunately there's no way currently to provide a shorthand for `send-keys` yet.
 
+### console input socket
+
+To get around the `tmux` session syntax noise, I decided to create a Unix domain socket as well.
+
+To type something in the SteamCMD game server console directly, you can use `netcat-openbsd` / `openbsd-netcat` like this:
+```
+echo "my server command" | nc -UN /tmp/steamcmd/console.sock
+```
+
+To expose the socket, just bind-mount the path (using `cs2` as an example):
+```yaml
+services:
+  cs2:
+    ...
+    volumes:
+      - /tmp/steamcmd:/tmp/steamcmd
+    ...
+```
+
+This socket makes it possible to forward console inputs from a web API or secure TCP socket for example.
+
 ### Base image
 - Based on the official [`SteamRT v3 "(Sniper)"` image](https://gitlab.steamos.cloud/steamrt/sniper/platform) with all necessary dependencies and basic tools preinstalled
 - For legacy game servers (Source 1, non-CS 2 and HLDS) SteamRT v2 "Soldier" is used instead

image/base/Dockerfile

@@ -18,7 +18,8 @@ ENV STEAMCMD_SH="${STEAMCMD_INSTALL_DIR}/steamcmd.sh"
 ## SteamCMD socket paths
 ENV STEAMCMD_SERVER_SOCKET_PATH="/tmp/steamcmd"
 ENV STEAMCMD_SERVER_TMUX_SOCKET="${STEAMCMD_SERVER_SOCKET_PATH}/tmux.sock" \
-    STEAMCMD_SERVER_LOGS_SOCKET="${STEAMCMD_SERVER_SOCKET_PATH}/logs.sock"
+    STEAMCMD_SERVER_LOGS_SOCKET="${STEAMCMD_SERVER_SOCKET_PATH}/logs.sock" \
+    STEAMCMD_SERVER_CONSOLE_SOCKET="${STEAMCMD_SERVER_SOCKET_PATH}/console.sock"
 ## System
 ENV TIME_ZONE=UTC \
     LANG=en_US.UTF-8 \
@@ -44,6 +45,8 @@ RUN apt-get update && \
         vim \
         nano \
         bash-completion \
+        # tools needed for managing unix domain sockets
+        netcat-openbsd \
     && \
         # Remve preinstalled SSHD configs
         rm -f /etc/ssh/sshd_config.d/* \

image/base/usr/local/lib/steamcmd/server-common.sh

@@ -112,6 +112,8 @@ _run_post() {
 
     echo ${MESSAGE_STEAMCMD_SERVER_WAITING}
     until healthy; do :; done
+
+    _input_socket
     echo ${MESSAGE_STEAMCMD_SERVER_HEALTHY}
 }
 
@@ -123,3 +125,14 @@ _logs_fifo() {
     ${TMUX_CMD} pipe-pane -O -t ${STEAMCMD_SERVER_SESSION_NAME} 'cat > ${STEAMCMD_SERVER_LOGS_SOCKET}'
     while :; do cat ${STEAMCMD_SERVER_LOGS_SOCKET}; done &
 }
+
+
+_input_socket() {
+    rm -rf ${STEAMCMD_SERVER_CONSOLE_SOCKET}
+    nc -lkU ${STEAMCMD_SERVER_CONSOLE_SOCKET} &
+
+    while :; do
+        input_string=$(nc -Ul ${STEAMCMD_SERVER_CONSOLE_SOCKET} < /dev/null)
+        ${TMUX_CMD} send-keys -t ${STEAMCMD_SERVER_SESSION_NAME} "${input_string}" "Enter"
+    done &
+}