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Crcon

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crcon is a lightweight command line interface used to issue commands to the openarena server without having to directly type those commands into the openarena server program.

PurposeEdit

The main reason to use crcon is to integrate the power of shell or python scripting (or any other scripting language) with server commands. Scripts can be written to display all sorts of information by calling a specfic server command, and then parsing that information. Seeing how the openarena server cli does not have build in support for coreutils such as grep or sed, and does not have support for more complex scripts involving loops and conditional expressions, crcon is meant to provide a bridge for scripts and server interaction.

UsageEdit

While crcon supports multiple games, this guide will focus on openarena. If starting up crcon with no parameters, the user will be greeted with a usage message:

usage: 
./crcon [-p password] [-P port] [-t type] [-b buffersize] server command
./crcon -l [-P port] [-t type] [-b buffersize] server
./crcon -v variable -p password [-P port] [-t type] [-b buffersize] server player_name
     -h | --help  			diplay this message
     -l | --list 	 		get player list
     -p password | --password=password 	set password
     -P port | --port=port  	  	default is 27960
     -t gametype | --type=gametype    	default is q3a, type -h gametype	 		              	        
     -v variable | --var=variable 	get player variable
     -b buffersize-kbytes | --buffersize=buffersize-kbytes  defaults to 4k

Here is a simple example of using crcon to receive the output of the "status" command from the server. This particular example is for a server running on the same machine, but that does not neccesarily have to be the case:

./crcon -p password -P 27961 localhost status

Notice here, password is the password for the server (the rconpassword variable in server.cfg). 27961 is the port number the server is running on. Localhost is the ip adress of the server that is being connected to. Status is the particular command being sent. Other commands can be cvarlist or "addbot sarge". Notice for commands spanning more than one word quotation marks need to be added.

An example of a script that automates this process is shown below.

#!/bin/bash
CRCONPATH="./crcon" # Path for crcon
RCONPASSWORD="<einstein>" # rcon password for the server 
    
server1="localhost"
port1="27961"
server2=""
port2=""
server3=""
port3=""
    
function connect
{
   $CRCONPATH -p $RCONPASSWORD -P $2 $1 "$3"
}
    
function connectToServers
{
  connect $server1 $port1 "$1"
#  connect $server2 $port2 "$1"
#  connect $server3 $port3 "$1"
}
    
message="status"
    
if test "$1" == "" ; then
    echo supply parameter     
else
    if [ $1 ==  "-p" ] ; then 
        connectToServers "cvarlist" | grep player | \
        sed 's/.*g_humanplayers "\([0-9]\)"/\1/'
    else
        connectToServers "$1"
    fi
fi

This script simplifies having to type the long string to simply get the status of the server. Assuming the script above is known as crconScript, the script can be launched with:

./crconScript status

Which will output:

num score ping name            lastmsg address               qport rate
--- ----- ---- --------------- ------- --------------------- ----- -----
0     0    0 S

In the example above, there was one player in the server. With this new script however, the number of players can be returned as a value to stdout, which can be used by other scripts to interact with the players in the server.

./crconScript -p

Will return the number of players currently in the server.

See alsoEdit

External linksEdit

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