jens@0: //
jens@0: //  IPAddress.h
jens@0: //  MYNetwork
jens@0: //
jens@0: //  Created by Jens Alfke on 1/4/08.
jens@0: //  Copyright 2008 Jens Alfke. All rights reserved.
jens@0: //
jens@0: 
jens@0: #import <Foundation/Foundation.h>
jens@0: 
jens@0: 
jens@2: /** Represents an Internet Protocol address and port number (similar to a sockaddr_in).
jens@0:     IPAddress itself only remembers the raw 32-bit IPv4 address; the subclass HostAddress
jens@0:     also remembers the DNS host-name. */
jens@0: @interface IPAddress : NSObject <NSCoding, NSCopying>
jens@0: {
jens@0:     UInt32 _ipv4;       // In network byte order (big-endian), just like struct in_addr
jens@0:     UInt16 _port;       // native byte order
jens@0: }
jens@0: 
jens@0: /** Initializes an IPAddress from a host name (which may be a DNS name or dotted-quad numeric form)
jens@0:     and port number.
jens@0:     If the hostname is not in dotted-quad form, an instance of the subclass HostAddress will
jens@0:     be returned instead. */
jens@0: - (id) initWithHostname: (NSString*)hostname port: (UInt16)port;
jens@0: 
jens@0: /** Initializes an IPAddress from a raw IPv4 address (in network byte order, i.e. big-endian)
jens@0:     and port number (in native byte order) */
jens@0: - (id) initWithIPv4: (UInt32)ipv4 port: (UInt16)port;
jens@0: 
jens@0: /** Initializes an IPAddress from a raw IPv4 address (in network byte order, i.e. big-endian).
jens@0:     The port number defaults to zero. */
jens@0: - (id) initWithIPv4: (UInt32)ipv4;
jens@0: 
jens@0: /** Initializes an IPAddress from a BSD struct sockaddr. */
jens@0: - (id) initWithSockAddr: (const struct sockaddr*)sockaddr;
jens@0: 
jens@26: /** Returns the IP address of this host (plus the specified port number).
jens@26:     If multiple network interfaces are active, the main one's address is returned. */
jens@26: + (IPAddress*) localAddressWithPort: (UInt16)port;
jens@26: 
jens@2: /** Returns the IP address of this host (with a port number of zero).
jens@0:     If multiple network interfaces are active, the main one's address is returned. */
jens@0: + (IPAddress*) localAddress;
jens@0: 
jens@0: /** Returns the address of the peer that an open socket is connected to.
jens@0:     (This calls getpeername.) */
jens@0: + (IPAddress*) addressOfSocket: (CFSocketNativeHandle)socket;
jens@0: 
jens@0: /** Returns YES if the two objects have the same IP address, ignoring port numbers. */
jens@0: - (BOOL) isSameHost: (IPAddress*)addr;
jens@0: 
jens@0: /** The raw IPv4 address, in network (big-endian) byte order. */
jens@0: @property (readonly) UInt32 ipv4;               // raw address in network byte order
jens@0: 
jens@0: /** The address as a dotted-quad string, e.g. @"10.0.1.1". */
jens@0: @property (readonly) NSString* ipv4name;
jens@0: 
jens@0: /** The address as a DNS hostname or else a dotted-quad string.
jens@0:     (IPAddress itself always returns dotted-quad; HostAddress returns the hostname it was
jens@0:     initialized with.) */
jens@0: @property (readonly) NSString* hostname;        // dotted-quad string, or DNS name if I am a HostAddress
jens@0: 
jens@0: /** The port number, or zero if none was specified, in native byte order. */
jens@0: @property (readonly) UInt16 port;
jens@0: 
jens@0: /** Is this IP address in a designated private/local address range, such as 10.0.1.X?
jens@0:     If so, the address is not globally meaningful outside of the local subnet. */
jens@0: @property (readonly) BOOL isPrivate;            // In a private/local addr range like 10.0.1.X?
jens@0: @end
jens@0: 
jens@0: 
jens@0: 
jens@0: /** A subclass of IPAddress that remembers the DNS hostname instead of a raw address.
jens@0:     An instance of HostAddress looks up its ipv4 address on the fly by calling gethostbyname. */
jens@0: @interface HostAddress : IPAddress
jens@0: {
jens@0:     NSString *_hostname;
jens@0: }
jens@0: 
jens@0: - (id) initWithHostname: (NSString*)hostname port: (UInt16)port;
jens@0: 
jens@0: @end
jens@0: 
jens@0: 
jens@0: 
jens@0: /** An IPAddress that can keep track of statistics on when it was last sucessfully used
jens@0:     and the number of successful attempts. This is useful when keeping a cache of recent
jens@0:     addresses for a peer that doesn't have a stable address. */
jens@0: @interface RecentAddress : IPAddress
jens@0: {
jens@0:     CFAbsoluteTime _lastSuccess;
jens@0:     UInt32 _successes;
jens@0: }
jens@0: 
jens@0: /** Initializes a RecentAddress from an IPAddress. (You can also initialize RecentAddress using
jens@0:     any inherited initializer method.) */
jens@0: - (id) initWithIPAddress: (IPAddress*)addr;
jens@0: 
jens@0: /** The absolute time that -noteSuccess or -noteSeen was last called. */
jens@0: @property (readonly) CFAbsoluteTime lastSuccess;
jens@0: 
jens@0: /** The number of times that -noteSuccess has been called. */
jens@0: @property (readonly) UInt32 successes;
jens@0: 
jens@0: /** Call this to indicate that the address was successfully used to connect to the desired peer.
jens@0:     Returns YES if the state of the object has changed and it should be re-archived. */
jens@0: - (BOOL) noteSuccess;
jens@0: 
jens@0: /** Call this to indicate that you have received evidence that this address is currently being
jens@0:     used by this peer. Unlike -noteSuccess it doesn't increment -successes, and only returns
jens@0:     YES (to indicate a persistent change) once every 18 hours (to avoid making the client
jens@0:     save its cache too often.) */
jens@0: - (BOOL) noteSeen;
jens@0: 
jens@0: @end