/* $Id$ */ /* * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) * Copyright (C) 2003-2008 Benny Prijono * * 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. * * 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. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef __PJ_ADDR_RESOLV_H__ #define __PJ_ADDR_RESOLV_H__ /** * @file addr_resolv.h * @brief IP address resolution. */ #include PJ_BEGIN_DECL /** * @defgroup pj_addr_resolve Network Address Resolution * @ingroup PJ_IO * @{ * * This module provides function to resolve Internet address of the * specified host name. To resolve a particular host name, application * can just call #pj_gethostbyname(). * * Example: *
 *   ...
 *   pj_hostent he;
 *   pj_status_t rc;
 *   pj_str_t host = pj_str("host.example.com");
 *   
 *   rc = pj_gethostbyname( &host, &he);
 *   if (rc != PJ_SUCCESS) {
 *      char errbuf[80];
 *      pj_strerror( rc, errbuf, sizeof(errbuf));
 *      PJ_LOG(2,("sample", "Unable to resolve host, error=%s", errbuf));
 *      return rc;
 *   }
 *
 *   // process address...
 *   addr.sin_addr.s_addr = *(pj_uint32_t*)he.h_addr;
 *   ...
 * 
* * It's pretty simple really... */ /** This structure describes an Internet host address. */ typedef struct pj_hostent { char *h_name; /**< The official name of the host. */ char **h_aliases; /**< Aliases list. */ int h_addrtype; /**< Host address type. */ int h_length; /**< Length of address. */ char **h_addr_list; /**< List of addresses. */ } pj_hostent; /** Shortcut to h_addr_list[0] */ #define h_addr h_addr_list[0] /** * This structure describes address information pj_getaddrinfo(). */ typedef struct pj_addrinfo { char ai_canonname[PJ_MAX_HOSTNAME]; /**< Canonical name for host*/ pj_sockaddr ai_addr; /**< Binary address. */ } pj_addrinfo; /** * This function fills the structure of type pj_hostent for a given host name. * For host resolution function that also works with IPv6, please see * #pj_getaddrinfo(). * * @param name Host name to resolve. Specifying IPv4 address here * may fail on some platforms (e.g. Windows) * @param he The pj_hostent structure to be filled. Note that * the pointers in this structure points to temporary * variables which value will be reset upon subsequent * invocation. * * @return PJ_SUCCESS, or the appropriate error codes. */ PJ_DECL(pj_status_t) pj_gethostbyname(const pj_str_t *name, pj_hostent *he); /** * Resolve the primary IP address of local host. * * @param af The desired address family to query. Valid values * are pj_AF_INET() or pj_AF_INET6(). * @param addr On successful resolution, the address family and address * part of this socket address will be filled up with the host * IP address, in network byte order. Other parts of the socket * address are untouched. * * @return PJ_SUCCESS on success, or the appropriate error code. */ PJ_DECL(pj_status_t) pj_gethostip(int af, pj_sockaddr *addr); /** * Get the IP address of the default interface. Default interface is the * interface of the default route. * * @param af The desired address family to query. Valid values * are pj_AF_INET() or pj_AF_INET6(). * @param addr On successful resolution, the address family and address * part of this socket address will be filled up with the host * IP address, in network byte order. Other parts of the socket * address are untouched. * * @return PJ_SUCCESS on success, or the appropriate error code. */ PJ_DECL(pj_status_t) pj_getdefaultipinterface(int af, pj_sockaddr *addr); /** * This function translates the name of a service location (for example, * a host name) and returns a set of addresses and associated information * to be used in creating a socket with which to address the specified * service. * * @param af The desired address family to query. Valid values * are pj_AF_INET(), pj_AF_INET6(), or pj_AF_UNSPEC(). * @param name Descriptive name or an address string, such as host * name. * @param count On input, it specifies the number of elements in * \a ai array. On output, this will be set with the * number of address informations found for the * specified name. * @param ai Array of address info to be filled with the information * about the host. * * @return PJ_SUCCESS on success, or the appropriate error code. */ PJ_DECL(pj_status_t) pj_getaddrinfo(int af, const pj_str_t *name, unsigned *count, pj_addrinfo ai[]); /** @} */ PJ_END_DECL #endif /* __PJ_ADDR_RESOLV_H__ */