#==============================================================================
# ** Module Win32 - Handles numerical based data.
#------------------------------------------------------------------------------
# Author    Ruby
# Version   1.8.1
#==============================================================================

module Win32

  #----------------------------------------------------------------------------
  # ● Retrieves data from a pointer.
  #----------------------------------------------------------------------------
  def copymem(len)
    buf = "\0" * len
    Win32API.new('kernel32', 'RtlMoveMemory', 'ppl', '').call(buf, self, len)
    buf
  end

end

# Extends the numeric class.
class Numeric
  include Win32
end

# Extends the string class.
class String
  include Win32
end

#==============================================================================
# ** Module Winsock - Maps out the functions held in the Winsock DLL.
#------------------------------------------------------------------------------
# Author    Ruby
# Version   1.8.1
#==============================================================================

module Winsock

  DLL = 'ws2_32'

  #----------------------------------------------------------------------------
  # * Accept Connection
  #----------------------------------------------------------------------------
  def self.accept(*args)
    Win32API.new(DLL, 'accept', 'ppl', 'l').call(*args)
  end
  #----------------------------------------------------------------------------
  # * Bind
  #----------------------------------------------------------------------------
  def self.bind(*args)
    Win32API.new(DLL, 'bind', 'ppl', 'l').call(*args)
  end
  #----------------------------------------------------------------------------
  # * Close Socket
  #----------------------------------------------------------------------------
  def self.closesocket(*args)
    Win32API.new(DLL, 'closesocket', 'p', 'l').call(*args)
  end
  #----------------------------------------------------------------------------
  # * Connect
  #----------------------------------------------------------------------------
  def self.connect(*args)
    Win32API.new(DLL, 'connect', 'ppl', 'l').call(*args)
  end
  #----------------------------------------------------------------------------
  # * Get host (Using Adress)
  #----------------------------------------------------------------------------
  def self.gethostbyaddr(*args)
    Win32API.new(DLL, 'gethostbyaddr', 'pll', 'l').call(*args)
  end
  #----------------------------------------------------------------------------
  # * Get host (Using Name)
  #----------------------------------------------------------------------------
  def self.gethostbyname(*args)
    Win32API.new(DLL, 'gethostbyname', 'p', 'l').call(*args)
  end
  #----------------------------------------------------------------------------
  # * Get host's Name
  #----------------------------------------------------------------------------
  def self.gethostname(*args)
    Win32API.new(DLL, 'gethostname', 'pl', '').call(*args)
  end
  #----------------------------------------------------------------------------
  # * Get Server (Using Name)
  #----------------------------------------------------------------------------
  def self.getservbyname(*args)
    Win32API.new(DLL, 'getservbyname', 'pp', 'p').call(*args)
  end
  #----------------------------------------------------------------------------
  # * HT OnL
  #----------------------------------------------------------------------------
  def self.htonl(*args)
    Win32API.new(DLL, 'htonl', 'l', 'l').call(*args)
  end
  #----------------------------------------------------------------------------
  # * HT OnS
  #----------------------------------------------------------------------------
  def self.htons(*args)
    Win32API.new(DLL, 'htons', 'l', 'l').call(*args)
  end
  #----------------------------------------------------------------------------
  # * Inet Adress
  #----------------------------------------------------------------------------
  def self.inet_addr(*args)
    Win32API.new(DLL, 'inet_addr', 'p', 'l').call(*args)
  end
  #----------------------------------------------------------------------------
  # * Inet NtOA
  #----------------------------------------------------------------------------
  def self.inet_ntoa(*args)
    Win32API.new(DLL, 'inet_ntoa', 'l', 'p').call(*args)
  end
  #----------------------------------------------------------------------------
  # * Listen
  #----------------------------------------------------------------------------
  def self.listen(*args)
    Win32API.new(DLL, 'listen', 'pl', 'l').call(*args)
  end
  #----------------------------------------------------------------------------
  # * Recieve
  #----------------------------------------------------------------------------
  def self.recv(*args)
    Win32API.new(DLL, 'recv', 'ppll', 'l').call(*args)
  end
  #----------------------------------------------------------------------------
  # * Select
  #----------------------------------------------------------------------------
  def self.select(*args)
    Win32API.new(DLL, 'select', 'lpppp', 'l').call(*args)
  end
  #----------------------------------------------------------------------------
  # * Send
  #----------------------------------------------------------------------------
  def self.send(*args)
    Win32API.new(DLL, 'send', 'ppll', 'l').call(*args)
  end
  #----------------------------------------------------------------------------
  # * Set Socket Options
  #----------------------------------------------------------------------------
  def self.setsockopt(*args)
    Win32API.new(DLL, 'setsockopt', 'pllpl', 'l').call(*args)
  end
  #----------------------------------------------------------------------------
  # * Shutdown
  #----------------------------------------------------------------------------
  def self.shutdown(*args)
    Win32API.new(DLL, 'shutdown', 'pl', 'l').call(*args)
  end
  #----------------------------------------------------------------------------
  # * Socket
  #----------------------------------------------------------------------------
  def self.socket(*args)
    Win32API.new(DLL, 'socket', 'lll', 'l').call(*args)
  end
  #----------------------------------------------------------------------------
  # * Get Last Error
  #----------------------------------------------------------------------------
  def self.WSAGetLastError(*args)
    Win32API.new(DLL, 'WSAGetLastError', '', 'l').call(*args)
  end

end

#==============================================================================
# ** Socket - Creates and manages sockets.
#------------------------------------------------------------------------------
# Author    Ruby
# Version   1.8.1
#==============================================================================

class Socket

  #----------------------------------------------------------------------------
  # ● Constants
  #----------------------------------------------------------------------------
  AF_UNSPEC                 = 0
  AF_UNIX                   = 1
  AF_INET                   = 2
  AF_IPX                    = 6
  AF_APPLETALK              = 16

  PF_UNSPEC                 = 0
  PF_UNIX                   = 1
  PF_INET                   = 2
  PF_IPX                    = 6
  PF_APPLETALK              = 16

  SOCK_STREAM               = 1
  SOCK_DGRAM                = 2
  SOCK_RAW                  = 3
  SOCK_RDM                  = 4
  SOCK_SEQPACKET            = 5

  IPPROTO_IP                = 0
  IPPROTO_ICMP              = 1
  IPPROTO_IGMP              = 2
  IPPROTO_GGP               = 3
  IPPROTO_TCP               = 6
  IPPROTO_PUP               = 12
  IPPROTO_UDP               = 17
  IPPROTO_IDP               = 22
  IPPROTO_ND                = 77
  IPPROTO_RAW               = 255
  IPPROTO_MAX               = 256

  SOL_SOCKET                = 65535

  SO_DEBUG                  = 1
  SO_REUSEADDR              = 4
  SO_KEEPALIVE              = 8
  SO_DONTROUTE              = 16
  SO_BROADCAST              = 32
  SO_LINGER                 = 128
  SO_OOBINLINE              = 256
  SO_RCVLOWAT               = 4100
  SO_SNDTIMEO               = 4101
  SO_RCVTIMEO               = 4102
  SO_ERROR                  = 4103
  SO_TYPE                   = 4104
  SO_SNDBUF                 = 4097
  SO_RCVBUF                 = 4098
  SO_SNDLOWAT               = 4099

  TCP_NODELAY               = 1

  MSG_OOB                   = 1
  MSG_PEEK                  = 2
  MSG_DONTROUTE             = 4

  IP_OPTIONS                = 1
  IP_DEFAULT_MULTICAST_LOOP = 1
  IP_DEFAULT_MULTICAST_TTL  = 1
  IP_MULTICAST_IF           = 2
  IP_MULTICAST_TTL          = 3
  IP_MULTICAST_LOOP         = 4
  IP_ADD_MEMBERSHIP         = 5
  IP_DROP_MEMBERSHIP        = 6
  IP_TTL                    = 7
  IP_TOS                    = 8
  IP_MAX_MEMBERSHIPS        = 20

  EAI_ADDRFAMILY            = 1
  EAI_AGAIN                 = 2
  EAI_BADFLAGS              = 3
  EAI_FAIL                  = 4
  EAI_FAMILY                = 5
  EAI_MEMORY                = 6
  EAI_NODATA                = 7
  EAI_NONAME                = 8
  EAI_SERVICE               = 9
  EAI_SOCKTYPE              = 10
  EAI_SYSTEM                = 11
  EAI_BADHINTS              = 12
  EAI_PROTOCOL              = 13
  EAI_MAX                   = 14

  AI_PASSIVE                = 1
  AI_CANONNAME              = 2
  AI_NUMERICHOST            = 4
  AI_MASK                   = 7
  AI_ALL                    = 256
  AI_V4MAPPED_CFG           = 512
  AI_ADDRCONFIG             = 1024
  AI_DEFAULT                = 1536
  AI_V4MAPPED               = 2048

  #----------------------------------------------------------------------------
  # ● Returns the associated IP address for the given hostname.
  #----------------------------------------------------------------------------
  def self.getaddress(host)
    gethostbyname(host)[3].unpack('C4').join('.')
  end
  #----------------------------------------------------------------------------
  # ● Returns the associated IP address for the given hostname.
  #----------------------------------------------------------------------------
  def self.getservice(serv)
    case serv
    when Numeric
      return serv
    when String
      return getservbyname(serv)
    else
      raise 'Please us an interger or string for services.'
    end
  end
  #----------------------------------------------------------------------------
  # ● Returns information about the given hostname.
  #----------------------------------------------------------------------------
  def self.gethostbyname(name)
    raise SocketError::ENOASSOCHOST if (ptr = Winsock.gethostbyname(name)) == 0
    host = ptr.copymem(16).unpack('iissi')
    [host[0].copymem(64).split("\0")[0], [], host[2], host[4].copymem(4).unpack('l')[0].copymem(4)]
  end
  #----------------------------------------------------------------------------
  # ● Returns the user's hostname.
  #----------------------------------------------------------------------------
  def self.gethostname
    buf = "\0" * 256
    Winsock.gethostname(buf, 256)
    buf.strip
  end
  #----------------------------------------------------------------------------
  # ● Returns information about the given service.
  #----------------------------------------------------------------------------
  def self.getservbyname(name)
    case name
    when /echo/i
      return 7
    when /daytime/i
      return 13
    when /ftp/i
      return 21
    when /telnet/i
      return 23
    when /smtp/i
      return 25
    when /time/i
      return 37
    when /http/i
      return 80
    when /pop/i
      return 110
    else
      raise 'Service not recognized.'
    end
  end
  #----------------------------------------------------------------------------
  # ● Creates an INET-sockaddr struct.
  #----------------------------------------------------------------------------
  def self.sockaddr_in(port, host)
    begin
      [AF_INET, getservice(port)].pack('sn') + gethostbyname(host)[3] + [].pack('x8')
    rescue
    end
  end
  #----------------------------------------------------------------------------
  # ● Creates a new socket and connects it to the given host and port.
  #----------------------------------------------------------------------------
  def self.open(*args)
    socket = new(*args)
    if block_given?
      begin
        yield socket
      ensure
        socket.close
      end
    end
    nil
  end
  #----------------------------------------------------------------------------
  # ● Creates a new socket.
  #----------------------------------------------------------------------------
  def initialize(domain, type, protocol)
    SocketError.check if (@fd = Winsock.socket(domain, type, protocol)) == -1
    @fd
  end
  #----------------------------------------------------------------------------
  # ● Accepts incoming connections.
  #----------------------------------------------------------------------------
  def accept(flags = 0)
    buf = "\0" * 16
    SocketError.check if Winsock.accept(@fd, buf, flags) == -1
    buf
  end
  #----------------------------------------------------------------------------
  # ● Binds a socket to the given sockaddr.
  #----------------------------------------------------------------------------
  def bind(sockaddr)
    SocketError.check if (ret = Winsock.bind(@fd, sockaddr, sockaddr.size)) == -1
    ret
  end
  #----------------------------------------------------------------------------
  # ● Closes a socket.
  #----------------------------------------------------------------------------
  def close
    SocketError.check if (ret = Winsock.closesocket(@fd)) == -1
    ret
  end
  #----------------------------------------------------------------------------
  # ● Connects a socket to the given sockaddr.
  #----------------------------------------------------------------------------
  def connect(sockaddr)
    SocketError.check if (ret = Winsock.connect(@fd, sockaddr, sockaddr.size)) == -1
    ret
  end
  #----------------------------------------------------------------------------
  # ● Listens for incoming connections.
  #----------------------------------------------------------------------------
  def listen(backlog)
    SocketError.check if (ret = Winsock.listen(@fd, backlog)) == -1
    ret
  end
  #----------------------------------------------------------------------------
  # ● Checks waiting data's status.
  #----------------------------------------------------------------------------
  def select(timeout)
    SocketError.check if (ret = Winsock.select(1, [1, @fd].pack('ll'), 0, 0, [timeout, timeout * 1000000].pack('ll'))) == -1
    ret
  end
  #----------------------------------------------------------------------------
  # ● Checks if data is waiting.
  #----------------------------------------------------------------------------
  def ready?
    not select(0) == 0
  end
  #----------------------------------------------------------------------------
  # ● Reads data from socket.
  #----------------------------------------------------------------------------
  def read(len)
    buf = "\0" * len
    Win32API.new('msvcrt', '_read', 'lpl', 'l').call(@fd, buf, len)
    buf
  end
  #----------------------------------------------------------------------------
  # ● Returns recieved data.
  #----------------------------------------------------------------------------
  def recv(len, flags = 0)
    buf = "\0" * len
    SocketError.check if Winsock.recv(@fd, buf, buf.size, flags) == -1
    buf
  end
  #----------------------------------------------------------------------------
  # ● Sends data to a host.
  #----------------------------------------------------------------------------
  def send(data, flags = 0)
    SocketError.check if (ret = Winsock.send(@fd, data, data.size, flags)) == -1
    ret
  end
  #----------------------------------------------------------------------------
  # ● Writes data to socket.
  #----------------------------------------------------------------------------
  def write(data)
    Win32API.new('msvcrt', '_write', 'lpl', 'l').call(@fd, data, 1)
  end

end

#==============================================================================
# ** TCPSocket - Creates and manages TCP sockets.
#------------------------------------------------------------------------------
# Author    Ruby
# Version   1.8.1
#==============================================================================

class TCPSocket < Socket

  #----------------------------------------------------------------------------
  # ● Creates a new socket and connects it to the given host and port.
  #----------------------------------------------------------------------------
  def self.open(*args)
    socket = new(*args)
    if block_given?
      begin
        yield socket
      ensure
        socket.close
      end
    end
    nil
  end
  #----------------------------------------------------------------------------
  # ● Creates a new socket and connects it to the given host and port.
  #----------------------------------------------------------------------------
  def initialize(host, port)
    super(AF_INET, SOCK_STREAM, IPPROTO_TCP)
    connect(Socket.sockaddr_in(port, host))
  end

end

#==============================================================================
# ** SocketError
#------------------------------------------------------------------------------
# Default exception class for sockets.
#==============================================================================

class SocketError < StandardError

  ENOASSOCHOST = 'getaddrinfo: no address associated with hostname.'

  # fixed by: https://lthzelda.wordpress.com/2010/04/28/rm-4-tcp-sockets-in-rpg-maker-vx/
  def self.check
    errno = Winsock.WSAGetLastError
    const = Errno.constants.detect {|c| Errno.const_get(c).new.errno == errno }
    if const
      raise Errno.const_get(const)
    else
      raise "Unknown network error code: #{errno}"
    end
  end

end