/* -*- C++ -*- */

//=============================================================================
/**
 *  @file    INET_Addr.h
 *
 *  @author Douglas C. Schmidt <d.schmidt@vanderbilt.edu>
 */
//=============================================================================

#ifndef ACE_INET_ADDR_H
#define ACE_INET_ADDR_H
#include /**/ "ace/pre.h"

#include "ace/Sock_Connect.h"

#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */

#include "ace/Addr.h"
#include <vector>

ACE_BEGIN_VERSIONED_NAMESPACE_DECL

/**
 * @class ACE_INET_Addr
 *
 * @brief Defines a C++ wrapper facade for the Internet domain address
 * family format.
 *
 * ACE_INET_Addr can hold all of the IP addresses assigned to a single name.
 * By default it refers only to the first, if there is more than one. The
 * next() method can make the others available in turn.
 */
class ACE_Export ACE_INET_Addr : public ACE_Addr
{
public:
  /// Default constructor.
  ACE_INET_Addr ();

  /// Copy constructor.
  ACE_INET_Addr (const ACE_INET_Addr &);

  /// Creates an ACE_INET_Addr from a sockaddr_in structure.
  ACE_INET_Addr (const sockaddr_in *addr, int len);

  /// Creates an ACE_INET_Addr from a @a port_number and the remote
  /// @a host_name. The port number is assumed to be in host byte order.
  /// To set a port already in network byte order, please @see set().
  /// Use address_family to select IPv6 (PF_INET6) vs. IPv4 (PF_INET).
  ACE_INET_Addr (u_short port_number,
                 const char host_name[],
                 int address_family = AF_UNSPEC);

  /**
   * Initializes an ACE_INET_Addr from the @a address, which can be
   * "ip-addr:port-number" (e.g., "tango.cs.wustl.edu:1234"),
   * "ip-addr:port-name" (e.g., "tango.cs.wustl.edu:telnet"),
   * "ip-number:port-number" (e.g., "128.252.166.57:1234"),
   * "ip-number:port-name" (e.g., "128.252.166.57:telnet"),
   * "[ipv6-number]:port-number (e.g, "[2001:db8::57]:1234") or
   * "[ipv6-number]:port-name (e.g, "[2001:db8::57]:telnet").
   * If there is no ':' in the @a address it is assumed to be a port number,
   * with the IP address being INADDR_ANY.
   */
  explicit ACE_INET_Addr (const char address[],
                          int address_family = AF_UNSPEC);

  /**
   * Creates an ACE_INET_Addr from a @a port_number and an Internet
   * @a ip_addr.  This method assumes that @a port_number and @a ip_addr
   * are in host byte order. If you have addressing information in
   * network byte order, @see set().
   */
  explicit ACE_INET_Addr (u_short port_number,
                          ACE_UINT32 ip_addr = INADDR_ANY);

  /// Uses getservbyname() to create an ACE_INET_Addr from a
  /// @a port_name, the remote @a host_name, and the @a protocol.
  ACE_INET_Addr (const char port_name[],
                 const char host_name[],
                 const char protocol[] = "tcp");

  /**
   * Uses getservbyname() to create an ACE_INET_Addr from a
   * @a port_name, an Internet @a ip_addr, and the @a protocol.  This
   * method assumes that @a ip_addr is in host byte order.
   */
  ACE_INET_Addr (const char port_name[],
                 ACE_UINT32 ip_addr,
                 const char protocol[] = "tcp");

#if defined (ACE_HAS_WCHAR)
  ACE_INET_Addr (u_short port_number,
                 const wchar_t host_name[],
                 int address_family = AF_UNSPEC);

  explicit ACE_INET_Addr (const wchar_t address[],
                          int address_family = AF_UNSPEC);

  ACE_INET_Addr (const wchar_t port_name[],
                 const wchar_t host_name[],
                 const wchar_t protocol[] = ACE_TEXT_WIDE ("tcp"));

  ACE_INET_Addr (const wchar_t port_name[],
                 ACE_UINT32 ip_addr,
                 const wchar_t protocol[] = ACE_TEXT_WIDE ("tcp"));
#endif /* ACE_HAS_WCHAR */

  /// Default dtor.
  ~ACE_INET_Addr ();

  // = Direct initialization methods.

  // These methods are useful after the object has been constructed.

  /// Assignment. In a more well-ordered world, member-wise assignment would
  /// work fine. However, because of the class design feature that all of the
  /// acceptor/connector-type classes that can be used in the
  /// Acceptor-Connector framework take ACE_Addr objects instead of the
  /// addressing class matching the family in use. The mechanism used to
  /// enable this substitution to the more-appropriate class is
  /// ACE_sap_any_cast, which casts the ACE_Addr to the more-specific class.
  /// In this case, casting an ACE_Addr to ACE_INET_Addr then copying it.
  /// Since adding multiple address support to ACE_INET_Addr, that cast-copy
  /// operation ends up, in the member-wise case, copying a bogus vector
  /// and doing lots of random damage. Thus, this operator is used to make
  /// life ordered in this common scenario.
  ACE_INET_Addr & operator= (const ACE_INET_Addr &rhs);

  /// Initializes from another ACE_INET_Addr.
  int set (const ACE_INET_Addr &);

  /**
   * Initializes an ACE_INET_Addr from a @a port_number and the
   * remote @a host_name.  If @a encode is non-zero then @a port_number is
   * converted into network byte order, otherwise it is assumed to be
   * in network byte order already and are passed straight through.
   * address_family can be used to select IPv4/IPv6 if the OS has
   * IPv6 capability (ACE_HAS_IPV6 is defined). To specify IPv6, use
   * the value AF_INET6. To specify IPv4, use AF_INET.
   */
  int set (u_short port_number,
           const char host_name[],
           int encode = 1,
           int address_family = AF_UNSPEC);

  /**
   * Initializes an ACE_INET_Addr from a @a port_number and an Internet
   * @a ip_addr.  If @a encode is non-zero then the port number and IP address
   * are converted into network byte order, otherwise they are assumed to be
   * in network byte order already and are passed straight through.
   *
   * If @a map is non-zero and IPv6 support has been compiled in,
   * then this address will be set to the IPv4-mapped IPv6 address of it.
   */
  int set (u_short port_number,
           ACE_UINT32 ip_addr = INADDR_ANY,
           int encode = 1,
           int map = 0);

  /// Uses getservbyname() to initialize an ACE_INET_Addr from a
  /// @a port_name, the remote @a host_name, and the @a protocol.
  int set (const char port_name[],
           const char host_name[],
           const char protocol[] = "tcp");

  /**
   * Uses getservbyname() to initialize an ACE_INET_Addr from a
   * @a port_name, an @a ip_addr, and the @a protocol.  This assumes that
   * @a ip_addr is already in network byte order.
   */
  int set (const char port_name[],
           ACE_UINT32 ip_addr,
           const char protocol[] = "tcp");

  /**
   * Initializes an ACE_INET_Addr from the @a address, which can be
   * "ip-addr:port-number" (e.g., "tango.cs.wustl.edu:1234"),
   * "ip-addr:port-name" (e.g., "tango.cs.wustl.edu:telnet"),
   * "ip-number:port-number" (e.g., "128.252.166.57:1234"),
   * "ip-number:port-name" (e.g., "128.252.166.57:telnet"),
   * "[ipv6-number]:port-number (e.g, "[2001:db8::57]:1234") or
   * "[ipv6-number]:port-name (e.g, "[2001:db8::57]:telnet").
   * If there is no ':' in the @a address it is assumed to be a port number,
   * with the IP address being INADDR_ANY.
   */
  int set (const char addr[], int address_family = AF_UNSPEC);

  /// Creates an ACE_INET_Addr from a sockaddr_in structure.
  int set (const sockaddr_in *,
           int len);

#if defined (ACE_HAS_WCHAR)
  int set (u_short port_number,
           const wchar_t host_name[],
           int encode = 1,
           int address_family = AF_UNSPEC);

  int set (const wchar_t port_name[],
           const wchar_t host_name[],
           const wchar_t protocol[] = ACE_TEXT_WIDE ("tcp"));

  int set (const wchar_t port_name[],
           ACE_UINT32 ip_addr,
           const wchar_t protocol[] = ACE_TEXT_WIDE ("tcp"));

  int set (const wchar_t addr[], int address_family = AF_UNSPEC);
#endif /* ACE_HAS_WCHAR */

  /// Return a pointer to the underlying network address.
  virtual void *get_addr () const;
  int get_addr_size() const;

  /// Set a pointer to the address.
  virtual void set_addr (const void *, int len);

  /// Set a pointer to the address.
  virtual void set_addr (const void *, int len, int map);

  /**
   * Transform the current ACE_INET_Addr address into string format.
   * If @a ipaddr_format is true this produces "ip-number:port-number"
   * (e.g., "128.252.166.57:1234" or "[2001:db8::57]:1234"), whereas
   * if @a ipaddr_format is false this produces "ip-name:port-number" (e.g.,
   * "tango.cs.wustl.edu:1234").  Returns -1 if the @a size of the
   * @a buffer is too small, else 0.
   */
  virtual int addr_to_string (ACE_TCHAR buffer[],
                              size_t size,
                              int ipaddr_format = 1) const;

  /**
   * Initializes an ACE_INET_Addr from the @a address, which can be
   * "ip-addr:port-number" (e.g., "tango.cs.wustl.edu:1234"),
   * "ip-addr:port-name" (e.g., "tango.cs.wustl.edu:telnet"),
   * "ip-number:port-number" (e.g., "128.252.166.57:1234"),
   * "ip-number:port-name" (e.g., "128.252.166.57:telnet"),
   * "[ipv6-number]:port-number (e.g, "[2001:db8::57]:1234") or
   * "[ipv6-number]:port-name (e.g, "[2001:db8::57]:telnet").
   * If there is no ':' in the @a address it is assumed to be a port number,
   * with the IP address being INADDR_ANY.
   */
  virtual int string_to_addr (const char address[],
                              int address_family = AF_UNSPEC);

#if defined (ACE_HAS_WCHAR)
  /*
  virtual int string_to_addr (const char address[]);
  */
#endif /* ACE_HAS_WCHAR */

  /**
   * Sets the port number without affecting the host name.  If
   * @a encode is enabled then @a port_number is converted into network
   * byte order, otherwise it is assumed to be in network byte order
   * already and are passed straight through.
   */
  void set_port_number (u_short,
                        int encode = 1);

  /**
   * Sets the address without affecting the port number.  If
   * @a encode is enabled then @a ip_addr is converted into network
   * byte order, otherwise it is assumed to be in network byte order
   * already and are passed straight through.  The size of the address
   * is specified in the @a len parameter.
   * If @a map is non-zero, IPv6 support has been compiled in, and
   * @a ip_addr is an IPv4 address, then this address is set to the IPv4-mapped
   * IPv6 address of it.
   */
  int set_address (const char *ip_addr,
                   int len,
                   int encode = 1,
                   int map = 0);

#if (defined (ACE_LINUX) || defined (ACE_WIN32)) && defined (ACE_HAS_IPV6)
  /**
   * Sets the interface that should be used for this address. This only has
   * an effect when the address is link local, otherwise it does nothing.
   */
  int set_interface (const char *intf_name);
#endif /* (ACE_LINUX || ACE_WIN32) && ACE_HAS_IPV6 */

  /// Return the port number, converting it into host byte-order.
  u_short get_port_number () const;

  /**
   * Return the character representation of the name of the host,
   * storing it in the @a hostname (which is assumed to be
   * @a hostnamelen bytes long).  This version is reentrant.  If
   * @a hostnamelen is greater than 0 then @a hostname will be
   * NUL-terminated even if -1 is returned.
   */
  int get_host_name (char hostname[],
                     size_t hostnamelen) const;

#if defined (ACE_HAS_WCHAR)
  int get_host_name (wchar_t hostname[],
                     size_t hostnamelen) const;
#endif /* ACE_HAS_WCHAR */

  /**
   * Return the character representation of the hostname.  This
   * version is non-reentrant since it returns a pointer to a static
   * data area.  You should therefore either (1) do a "deep copy" of
   * the address returned by get_host_name(), e.g., using strdup() or
   * (2) use the "reentrant" version of get_host_name() described
   * above.
   */
  const char *get_host_name () const;

  /**
   * Return the "dotted decimal" Internet address representation of
   * the hostname storing it in the @a addr (which is assumed to be
   * @a addr_size bytes long).  This version is reentrant.
   */
  const char *get_host_addr (char *addr, int addr_size) const;

  /**
   * Return the "dotted decimal" Internet address representation of
   * the hostname.  This version is non-reentrant since it returns a
   * pointer to a static data area.  You should therefore either
   * (1) do a "deep copy" of the address returned by get_host_addr(), e.g.,
   * using strdup() or (2) use the "reentrant" version of
   * get_host_addr() described above.
   */
  const char *get_host_addr () const;

  /// Return the 4-byte IP address, converting it into host byte
  /// order.
  ACE_UINT32 get_ip_address () const;

  /// Return @c true if the IP address is INADDR_ANY or IN6ADDR_ANY.
  bool is_any () const;

  /// Return @c true if the IP address is IPv4/IPv6 loopback address.
  bool is_loopback () const;

  /// Return @c true if the IP address is IPv4/IPv6 multicast address.
  bool is_multicast () const;

#if defined (ACE_HAS_IPV6)
  /// Return @c true if the IP address is IPv6 linklocal address.
  bool is_linklocal (void) const;

  /// Return @c true if the IP address is IPv6 sitelocal address.
  bool is_sitelocal (void) const;

  /// Return @c true if the IP address is IPv4-mapped IPv6 address.
  bool is_ipv4_mapped_ipv6 (void) const;

  /// Return @c true if the IP address is IPv4-compatible IPv6 address.
  bool is_ipv4_compat_ipv6 (void) const;
#endif /* ACE_HAS_IPV6 */

  /**
   * Returns @c true if @c this is less than @a rhs.  In this context,
   * "less than" is defined in terms of IP address and TCP port
   * number.  This operator makes it possible to use @c ACE_INET_Addrs
   * in STL maps.
   */
  bool operator < (const ACE_INET_Addr &rhs) const;

  /// Compare two addresses for equality.  The addresses are considered
  /// equal if they contain the same IP address and port number.
  bool operator == (const ACE_INET_Addr &SAP) const;

  /// Compare two addresses for inequality.
  bool operator != (const ACE_INET_Addr &SAP) const;

  /// A variation of the equality operator, this method only compares the
  /// IP address and ignores the port number.
  bool is_ip_equal (const ACE_INET_Addr &SAP) const;

  /// Computes and returns hash value.
  virtual u_long hash () const;

  /// If there is another address to examine, move to it and return true;
  /// else return false.
  bool next ();

  /// Reset the set of address so they can be scanned again using next().
  void reset ();

  /// Dump the state of an object.
  void dump () const;

  /// Declare the dynamic allocation hooks.
  ACE_ALLOC_HOOK_DECLARE;

private:
  /// Insure that @a hostname is properly null-terminated.
  int get_host_name_i (char hostname[], size_t hostnamelen) const;

  // Methods to gain access to the actual address of
  // the underlying internet address structure.
  void *ip_addr_pointer () const;
  int ip_addr_size () const;
  int determine_type () const;

  /// Initialize underlying inet_addr_ to default values
  void reset_i ();

  /// Underlying representation.
  /// This union uses the knowledge that the two structures share the
  /// first member, sa_family (as all sockaddr structures do).
  union ip46
  {
    sockaddr_in  in4_;
#if defined (ACE_HAS_IPV6)
    sockaddr_in6 in6_;
#endif /* ACE_HAS_IPV6 */
  } inet_addr_;
  // If there is more than one address assigned to a given name, this
  // holds all of them; one is always copied to inet_addr_.
  std::vector<union ip46> inet_addrs_;
  std::vector<union ip46>::iterator inet_addrs_iter_;
};

ACE_END_VERSIONED_NAMESPACE_DECL

#if defined (__ACE_INLINE__)
#include "ace/INET_Addr.inl"
#endif /* __ACE_INLINE__ */

#include /**/ "ace/post.h"
#endif /* ACE_INET_ADDR_H */
