class FreeBsdPorts

def parse_net_address(net_addr, protocol)
  case protocol
  when 'tcp4', 'udp4', 'tcp', 'udp'
    # replace * with 0.0.0.0
    net_addr = net_addr.gsub(/^\*:/, '0.0.0.0:') if net_addr =~ /^*:(\d+)$/
    ip_addr = URI('addr://'+net_addr)
    host = ip_addr.host
    port = ip_addr.port
  when 'tcp6', 'udp6'
    return [] if net_addr == '*:*' # abort for now
    # replace * with 0:0:0:0:0:0:0:0
    net_addr = net_addr.gsub(/^\*:/, '0:0:0:0:0:0:0:0:') if net_addr =~ /^*:(\d+)$/
    # extract port
    ip6 = /^(\S+):(\d+)$/.match(net_addr)
    ip6addr = ip6[1]
    ip_addr = URI("addr://[#{ip6addr}]:#{ip6[2]}")
    # replace []
    host = ip_addr.host[1..ip_addr.host.size-2]
    port = ip_addr.port
  end
  [host, port]
rescue URI::InvalidURIError => e
  warn "Could not parse #{net_addr}, #{e}"
  nil
end