191 lines
6.3 KiB
C
191 lines
6.3 KiB
C
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/* $Id$ */
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/*
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* Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
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* Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __PJ_ADDR_RESOLV_H__
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#define __PJ_ADDR_RESOLV_H__
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/**
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* @file addr_resolv.h
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* @brief IP address resolution.
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*/
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#include <pj/sock.h>
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PJ_BEGIN_DECL
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/**
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* @defgroup pj_addr_resolve Network Address Resolution
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* @ingroup PJ_IO
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* @{
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*
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* This module provides function to resolve Internet address of the
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* specified host name. To resolve a particular host name, application
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* can just call #pj_gethostbyname().
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*
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* Example:
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* <pre>
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* ...
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* pj_hostent he;
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* pj_status_t rc;
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* pj_str_t host = pj_str("host.example.com");
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*
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* rc = pj_gethostbyname( &host, &he);
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* if (rc != PJ_SUCCESS) {
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* char errbuf[80];
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* pj_strerror( rc, errbuf, sizeof(errbuf));
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* PJ_LOG(2,("sample", "Unable to resolve host, error=%s", errbuf));
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* return rc;
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* }
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*
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* // process address...
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* addr.sin_addr.s_addr = *(pj_uint32_t*)he.h_addr;
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* ...
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* </pre>
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*
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* It's pretty simple really...
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*/
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/** This structure describes an Internet host address. */
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typedef struct pj_hostent
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{
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char *h_name; /**< The official name of the host. */
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char **h_aliases; /**< Aliases list. */
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int h_addrtype; /**< Host address type. */
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int h_length; /**< Length of address. */
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char **h_addr_list; /**< List of addresses. */
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} pj_hostent;
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/** Shortcut to h_addr_list[0] */
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#define h_addr h_addr_list[0]
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/**
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* This structure describes address information pj_getaddrinfo().
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*/
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typedef struct pj_addrinfo
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{
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char ai_canonname[PJ_MAX_HOSTNAME]; /**< Canonical name for host*/
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pj_sockaddr ai_addr; /**< Binary address. */
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} pj_addrinfo;
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/**
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* This function fills the structure of type pj_hostent for a given host name.
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* For host resolution function that also works with IPv6, please see
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* #pj_getaddrinfo().
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*
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* @param name Host name to resolve. Specifying IPv4 address here
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* may fail on some platforms (e.g. Windows)
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* @param he The pj_hostent structure to be filled. Note that
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* the pointers in this structure points to temporary
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* variables which value will be reset upon subsequent
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* invocation.
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*
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* @return PJ_SUCCESS, or the appropriate error codes.
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*/
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PJ_DECL(pj_status_t) pj_gethostbyname(const pj_str_t *name, pj_hostent *he);
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/**
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* Resolve the primary IP address of local host.
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*
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* @param af The desired address family to query. Valid values
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* are pj_AF_INET() or pj_AF_INET6().
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* @param addr On successful resolution, the address family and address
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* part of this socket address will be filled up with the host
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* IP address, in network byte order. Other parts of the socket
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* address are untouched.
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*
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* @return PJ_SUCCESS on success, or the appropriate error code.
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*/
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PJ_DECL(pj_status_t) pj_gethostip(int af, pj_sockaddr *addr);
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/**
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* Get the interface IP address to send data to the specified destination.
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*
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* @param af The desired address family to query. Valid values
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* are pj_AF_INET() or pj_AF_INET6().
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* @param dst The destination host.
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* @param itf_addr On successful resolution, the address family and address
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* part of this socket address will be filled up with the host
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* IP address, in network byte order. Other parts of the socket
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* address should be ignored.
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* @param allow_resolve If \a dst may contain hostname (instead of IP
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* address), specify whether hostname resolution should
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* be performed. If not, default interface address will
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* be returned.
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* @param p_dst_addr If not NULL, it will be filled with the IP address of
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* the destination host.
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*
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* @return PJ_SUCCESS on success, or the appropriate error code.
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*/
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PJ_DECL(pj_status_t) pj_getipinterface(int af,
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const pj_str_t *dst,
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pj_sockaddr *itf_addr,
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pj_bool_t allow_resolve,
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pj_sockaddr *p_dst_addr);
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/**
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* Get the IP address of the default interface. Default interface is the
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* interface of the default route.
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*
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* @param af The desired address family to query. Valid values
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* are pj_AF_INET() or pj_AF_INET6().
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* @param addr On successful resolution, the address family and address
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* part of this socket address will be filled up with the host
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* IP address, in network byte order. Other parts of the socket
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* address are untouched.
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*
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* @return PJ_SUCCESS on success, or the appropriate error code.
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*/
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PJ_DECL(pj_status_t) pj_getdefaultipinterface(int af,
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pj_sockaddr *addr);
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/**
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* This function translates the name of a service location (for example,
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* a host name) and returns a set of addresses and associated information
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* to be used in creating a socket with which to address the specified
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* service.
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*
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* @param af The desired address family to query. Valid values
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* are pj_AF_INET(), pj_AF_INET6(), or pj_AF_UNSPEC().
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* @param name Descriptive name or an address string, such as host
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* name.
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* @param count On input, it specifies the number of elements in
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* \a ai array. On output, this will be set with the
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* number of address informations found for the
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* specified name.
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* @param ai Array of address info to be filled with the information
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* about the host.
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*
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* @return PJ_SUCCESS on success, or the appropriate error code.
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*/
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PJ_DECL(pj_status_t) pj_getaddrinfo(int af, const pj_str_t *name,
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unsigned *count, pj_addrinfo ai[]);
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/** @} */
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PJ_END_DECL
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#endif /* __PJ_ADDR_RESOLV_H__ */
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