require "socket"
s=TCPServer.new("localhost",3000)
c=s.accept
udpsocks=[]
tcpsocks=[]
next_sock=0
puts "Connection established"
while true
  ch=c.getc
  if ch==nil
    next
  end
  cmd=ch.ord
  if cmd==0
    c.print [192,168,0,10].pack("CCCC")
  end
  if cmd==1
    sock=UDPSocket.new()
    sock.bind("10.0.0.180",0)
    c.print [next_sock,sock.addr[1]].pack("L<L<")
    udpsocks[next_sock]=sock
    next_sock+=1;
  end
  if cmd==4
    info=c.read(12).unpack("L<CCCCS<S<")
    msg=c.read(info[6])
    udpsocks[info[0]].send(msg,0,"#{info[1]}.#{info[2]}.#{info[3]}.#{info[4]}",info[5])
  end
  if cmd==5
    id=c.read(4).unpack("L<")[0]
    msg=udpsocks[id].recv(65536)
    if msg==""
      c.print [0].pack("L<")
    else
      c.print [msg.length].pack("L<")
      c.print msg
    end
  end
  if cmd==6
    id=c.read(4).unpack("L<")[0]
    udpsocks[id]=nil
  end
  if cmd==7
    info=c.read(6).unpack("CCCCS<")
    sock=TCPSocket.new("#{info[0]}.#{info[1]}.#{info[2]}.#{info[3]}",info[4])
    c.print [next_sock].pack("L<")
    tcpsocks[next_sock]=sock
    next_sock+=1;
  end
  if cmd==8
    info=c.read(6).unpack("L<S<")
    msg=c.read(info[1])
    tcpsocks[info[0]].print msg
  end
  if cmd==9
    id=c.read(4).unpack("L<")[0]
    if !tcpsocks[id].ready? and tcpsocks[id].closed?
      c.print [0].pack("L<")
    else
      msg=tcpsocks[id].gets
      c.print [msg.length].pack("L<")
      c.print msg
    end
  end
end