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/*
* Copyright (C) 2006-2009 Tobias Brunner
* Copyright (C) 2006 Daniel Roethlisberger
* Copyright (C) 2005-2008 Martin Willi
* Copyright (C) 2005 Jan Hutter
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
/**
* @defgroup host host
* @{ @ingroup utils
*/
#ifndef HOST_H_
#define HOST_H_
typedef enum host_diff_t host_diff_t;
typedef struct host_t host_t;
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <chunk.h>
/**
* Differences between two hosts. They differ in
* address, port, or both.
*/
enum host_diff_t {
HOST_DIFF_NONE = 0,
HOST_DIFF_ADDR = 1,
HOST_DIFF_PORT = 2,
};
/**
* Representates a Host
*
* Host object, identifies a address:port pair and defines some
* useful functions on it.
*/
struct host_t {
/**
* Build a clone of this host object.
*
* @return cloned host
*/
host_t *(*clone) (host_t *this);
/**
* Get a pointer to the internal sockaddr struct.
*
* This is used for sending and receiving via sockets.
*
* @return pointer to the internal sockaddr structure
*/
sockaddr_t *(*get_sockaddr) (host_t *this);
/**
* Get the length of the sockaddr struct.
*
* Depending on the family, the length of the sockaddr struct
* is different. Use this function to get the length of the sockaddr
* struct returned by get_sock_addr.
*
* This is used for sending and receiving via sockets.
*
* @return length of the sockaddr struct
*/
socklen_t *(*get_sockaddr_len) (host_t *this);
/**
* Gets the family of the address
*
* @return family
*/
int (*get_family) (host_t *this);
/**
* Checks if the ip address of host is set to default route.
*
* @return TRUE if host is 0.0.0.0 or 0::0, FALSE otherwise
*/
bool (*is_anyaddr) (host_t *this);
/**
* Get the address of this host as chunk_t
*
* Returned chunk points to internal data.
*
* @return address string,
*/
chunk_t (*get_address) (host_t *this);
/**
* Get the port of this host
*
* @return port number
*/
u_int16_t (*get_port) (host_t *this);
/**
* Set the port of this host
*
* @param port port numer
*/
void (*set_port) (host_t *this, u_int16_t port);
/**
* Compare the ips of two hosts hosts.
*
* @param other the other to compare
* @return TRUE if addresses are equal.
*/
bool (*ip_equals) (host_t *this, host_t *other);
/**
* Compare two hosts, with port.
*
* @param other the other to compare
* @return TRUE if addresses and ports are equal.
*/
bool (*equals) (host_t *this, host_t *other);
/**
* Compare two hosts and return the differences.
*
* @param other the other to compare
* @return differences in a combination of host_diff_t's
*/
host_diff_t (*get_differences) (host_t *this, host_t *other);
/**
* Destroy this host object.
*/
void (*destroy) (host_t *this);
};
/**
* Constructor to create a host_t object from an address string.
*
* @param string string of an address, such as "152.96.193.130"
* @param port port number
* @return host_t, NULL if string not an address.
*/
host_t *host_create_from_string(char *string, u_int16_t port);
/**
* Constructor to create a host_t from a DNS name.
*
* @param string hostname to resolve
* @param family family to prefer, 0 for first match
* @param port port number
* @return host_t, NULL lookup failed
*/
host_t *host_create_from_dns(char *string, int family, u_int16_t port);
/**
* Constructor to create a host_t object from an address chunk.
*
* If family is AF_UNSPEC, it is guessed using address.len.
*
* @param family Address family, such as AF_INET or AF_INET6
* @param address address as chunk_t in network order
* @param port port number
* @return host_t, NULL if family not supported/chunk invalid
*/
host_t *host_create_from_chunk(int family, chunk_t address, u_int16_t port);
/**
* Constructor to create a host_t object from a sockaddr struct
*
* @param sockaddr sockaddr struct which contains family, address and port
* @return host_t, NULL if family not supported
*/
host_t *host_create_from_sockaddr(sockaddr_t *sockaddr);
/**
* Create a host from a CIDR subnet definition (1.2.3.0/24), return bits.
*
* @param string string to parse
* @param bits gets the number of network bits in CIDR notation
* @return network start address, NULL on error
*/
host_t *host_create_from_subnet(char *string, int *bits);
/**
* Create a host without an address, a "any" host.
*
* @param family family of the any host
* @return host_t, NULL if family not supported
*/
host_t *host_create_any(int family);
/**
* printf hook function for host_t.
*
* Arguments are:
* host_t *host
* Use #-modifier to include port number
*/
int host_printf_hook(printf_hook_data_t *data, printf_hook_spec_t *spec,
const void *const *args);
#endif /** HOST_H_ @}*/
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