Minecraft Authentication

simpleauth.sh

#!/bin/sh

user=$1
pass=$2

echo "Login..."
oldIFS="$IFS"
IFS=':'
set -- `curl -d "user=$user&password=$pass&version=9999" https://login.minecraft.net/`
IFS="$oldIFS"
if [ $# -ne 4 ]
then
        echo "ERR: $@"
        exit 1
fi
sid=$4
user=$3
hash=$RANDOM
echo "Now I'm the client ($user)..."
curl -L "http://www.minecraft.net/game/joinserver.jsp?user=$user&sessionId=$sid&serverId=$hash"
echo
echo "Now I'm the server..."
curl -L "http://www.minecraft.net/game/checkserver.jsp?user=$user&serverId=$hash"
echo