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