/*
    Copyright (C) 2008 Andreas Baumann <abaumann@yahoo.com>

    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 3 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, see <http://www.gnu.org/licenses/>.
*/

#ifndef WOLF_NETDB_H
#define WOLF_NETDB_H

/**
 * @addtogroup wolf_port Porting
 * @{
 */

/**
 * @file netdb.h
 * @brief POSIX getaddrinfo and getnameinfo
 * @author Andreas Baumann <abaumann@yahoo.com>
 */

/*
 * Based on ideas found in:
 * - Postgres src/port/getaddrinfo.c
 *   Copyright (c) 2003-2008, PostgreSQL Global Development Group
 * - Unix Stevens Network Programming
 *   libgai implementation in unpv12e
 */

#include "port/sys.h"

#ifdef FREEBSD
/* not sure about that */
#define __BSD_VISIBLE 0
#include <sys/socket.h>			/* for AF_UNSPEC */
#include </usr/include/netinet/in.h>	/* for IPPROTO_TCP */
#endif

#ifdef SUNOS
#if OS_MAJOR_VERSION == 5
#if OS_MINOR_VERSION >= 8 && OS_MINOR_VERSION <= 10
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#endif
#endif
#endif                  

#ifdef NETBSD
#include <sys/socket.h>			/* for AF_UNDEF */
#include <netinet/in.h>                 /* for IPPROTO_TCP */
#endif

#ifdef OPENBSD
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>			/* for IPPROTO_TCP */
#endif

/* for all modern Unix systems */        
#ifndef _WIN32      
#include <netdb.h>			/* for getaddrinfo, freeadrinfo,
					   struct getaddrinfo */
#endif

/* exists on Windows in slightly different form */
#ifdef _WIN32
#define WIN32_MEAN_AND_LEAN
#include <Winsock2.h>			/* all kind of prerequisites */
#include <WS2tcpip.h>			/* for getaddrinfo */
#endif

#ifndef NI_MAXHOST
#define NI_MAXHOST      1025
#endif

#ifndef NI_MAXSERV
#define NI_MAXSERV      32
#endif

#if !defined HAVE_GETADDRINFO || defined TEST_GETADDRINFO

#include <sys/types.h>			/* for size_t */
#include <sys/socket.h>			/* for AF_UNSPEC */
#include <arpa/inet.h>			/* for TCPPROTO and others */

/* for errors returned by getaddrinfo */
#if !defined EAI_NONAME
#define EAI_NONAME		-2	/**< NAME or SERVICE is unknown */
#define EAI_AGAIN		-3	/**< temporary failure in name resolution */
#define EAI_FAIL		-4	/**< non-recoverable failure in name resultion */
#define EAI_FAMILY		-6	/**< socket family not supported */
#define EAI_MEMORY		-10	/**< memory allocation failure */
#endif

/* for ai_flags */
#if !defined AI_PASSIVE
#define AI_PASSIVE		1	/**< socket is intended for bind() + listen() */
#define AI_CANONNAME		2	/**< return canonical name */
#define AI_NUMERICHOST		4	/**< don't use name resolution */
#endif

/* for flags in getnameinfo */
#if !defined NI_NUMERICHOST
#define NI_NUMERICHOST		1       /**< don't try to look up hostname.  */
#define NI_NUMERICSERV		2	/**< don't convert port number to name.  */
#endif

struct wolf_port_addrinfo
{
	int ai_flags;
	int ai_family;
	int ai_socktype;
	int ai_protocol;
	size_t ai_addrlen;  
	struct sockaddr *ai_addr;
	char *ai_canonname;
	struct wolf_port_addrinfo *ai_next;
};

int wolf_port_getaddrinfo(		const char *host_name,
					const char *service_name,
					const struct wolf_port_addrinfo *hints,
					struct wolf_port_addrinfo **result );
void wolf_port_freeaddrinfo(		struct wolf_port_addrinfo *result );

int wolf_port_getnameinfo(		const struct sockaddr *sa, socklen_t salen,
					char *host, size_t hostlen,
					char *serv, size_t servlen,	
					int flags );
						
const char *wolf_port_gai_strerror(	int errcode );

#if !defined HAVE_GETADDRINFO
#define addrinfo wolf_port_addrinfo
#define getaddrinfo( host_name, service_name, hints, result ) wolf_port_getaddrinfo( host_name, service_name, hints, result )
#define freeaddrinfo( result ) wolf_port_freeaddrinfo( result )
#define getnameinfo( sa, salen, host, hostlen, serv, servlen, flags ) wolf_port_getnameinfo( sa, salen, host, hostlen, serv, servlen, flags )
#define gai_strerror( errcode ) wolf_port_gai_strerror( errcode )
#endif

#endif /* !defined HAVE_GETADDRINFO || defined TEST_GETADDRINFO */

/* gai_strerror is not thread-safe. Some platforms (like AIX 6.1) started to
 * introduce a thread-safe version gai_strerror_r
 */
#if !defined HAVE_GAI_STRERROR_R || defined TEST_GAI_STRERROR_R
int wolf_port_gai_strerror_r( int errcode, char *buf, size_t buflen );
#if !defined HAVE_GAI_STRERROR_R
#define gai_strerror_r( errcode, buf, buflen ) wolf_port_gai_strerror_r( errcode, buf, buflen )
#endif /* !defined HAVE_GAI_STRERROR_R */

#endif /* !defined HAVE_GAI_STRERROR_R || defined TEST_GAI_STRERROR_R */

/** @} */ /* @addtogroup wolf_port */

#endif /* ifndef WOLF_NETDB_H */