Shell script to display raw Quake 3 server info and status responses.

fetch-serverinfo

#!/bin/bash
# Shell script to display raw Quake 3 server info and status responses.
# Author: Zack Middleton (zturtleman)
# License: Creative Commons Zero (CC0)

# Note: Default 'classic' netcat doesn't support IPv6 (debian package netcat-traditional)
#       so I use the OpenBSD rewrite instead. (debian package netcat-openbsd)
#       There is also a nc6 command in netcat6 package...

# netcat arguments:
#   -u means UDP
#   -q1 means quit waiting for reply after 1 second
NETCAT="nc"
NETCATARGS="-u -q1"

HOST_AND_MAYBE_PORT=$1

HOST=$1
PORT=$2

if [ -z $PORT ]; then
	case "$HOST_AND_MAYBE_PORT" in
	  # IPv6 address with port
	  \[*\]:*)
		HOST=`echo $HOST_AND_MAYBE_PORT | cut -d[ -f 2 | cut -d] -f 1`
		PORT=`echo $HOST_AND_MAYBE_PORT | cut -d] -f 2 | cut -c 2-`
		;;
	  # IPv6 address
	  *:*:*)
		HOST=$HOST_AND_MAYBE_PORT
		PORT=27960
		;;
	  # IPv4 address or hostname with port
	  *:*)
		HOST=`echo $HOST_AND_MAYBE_PORT | cut -d: -f 1`
		PORT=`echo $HOST_AND_MAYBE_PORT | cut -d: -f 2`
		;;
	  # IPv4 address or hostname
	  *)
		HOST=$HOST_AND_MAYBE_PORT
		PORT=27960
		;;
	esac
fi

if [ -z $HOST ]; then
	echo "Usage: fetch-serverinfo [host:port]"
	echo "                        [host] <port>"
	exit 0
fi

if ! command -v $NETCAT >/dev/null 2>&1; then
	echo "Error: Missing netcat ($NETCAT command)"
	exit 1
fi


printf "Checking $HOST port $PORT\n\n"

printf "Info:\n\n"

# use cut to remove the "\xFF\xFF\xFF\xFFinfoResponse\n"
printf "\xFF\xFF\xFF\xFFgetinfo xxx" | $NETCAT $NETCATARGS "$HOST" "$PORT" | cut -d"
" -f 2-

printf "\n\n"

printf "Status:\n\n"

# use cut to remove the "\xFF\xFF\xFF\xFFstatusResponse\n"
printf "\xFF\xFF\xFF\xFFgetstatus xxx" | $NETCAT $NETCATARGS "$HOST" "$PORT" | cut -d"
" -f 2-

printf "\n"