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/*****************************************************************************
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 * vlc_network.h: interface to communicate with network plug-ins
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 *****************************************************************************
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LGPL  
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 * Copyright (C) 2002-2005 VLC authors and VideoLAN
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 * Copyright © 2006-2007 Rémi Denis-Courmont
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 * $Id$
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 *
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 * Authors: Christophe Massiot <massiot@via.ecp.fr>
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 *          Laurent Aimar <fenrir@via.ecp.fr>
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 *          Rémi Denis-Courmont <rem # videolan.org>
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 *
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LGPL  
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 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
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 * (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
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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 *****************************************************************************/

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#ifndef VLC_NETWORK_H
# define VLC_NETWORK_H
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/**
 * \file
 * This file defines interface to communicate with network plug-ins
 */

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#if defined( WIN32 )
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#   if !defined(UNDER_CE)
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#       define _NO_OLDNAMES 1
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#       include <io.h>
#   endif
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#   include <winsock2.h>
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#   include <ws2tcpip.h>
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#   define ENETUNREACH WSAENETUNREACH
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#   define net_errno (WSAGetLastError())
extern const char *net_strerror( int val );
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struct iovec
{
    void  *iov_base;
    size_t iov_len;
};

struct msghdr
{
    void         *msg_name;
    size_t        msg_namelen;
    struct iovec *msg_iov;
    size_t        msg_iovlen;
    void         *msg_control;
    size_t        msg_controllen;
    int           msg_flags;
};

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#   ifndef IPV6_V6ONLY
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#       define IPV6_V6ONLY 27
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#   endif
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#else
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#   include <sys/types.h>
#   include <unistd.h>
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#   include <sys/socket.h>
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#   include <netinet/in.h>
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#   include <netdb.h>
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#   define net_errno errno
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#endif

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#if defined( __SYMBIAN32__ )
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#   undef AF_INET6
#   undef IN6_IS_ADDR_MULTICAST
#   undef IPV6_V6ONLY
#   undef IPV6_MULTICAST_HOPS
#   undef IPV6_MULTICAST_IF
#   undef IPV6_TCLASS
#   undef IPV6_JOIN_GROUP
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#endif

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int vlc_socket (int, int, int, bool nonblock) VLC_USED;
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struct sockaddr;
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VLC_API int vlc_accept( int, struct sockaddr *, socklen_t *, bool ) VLC_USED;
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# ifdef __cplusplus
extern "C" {
# endif
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/* Portable networking layer communication */
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int net_Socket (vlc_object_t *obj, int family, int socktype, int proto);

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VLC_API int net_Connect(vlc_object_t *p_this, const char *psz_host, int i_port, int socktype, int protocol);
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#define net_Connect(a, b, c, d, e) net_Connect(VLC_OBJECT(a), b, c, d, e)
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VLC_API int * net_Listen(vlc_object_t *p_this, const char *psz_host, int i_port, int socktype, int protocol);
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#define net_ListenTCP(a, b, c) net_Listen(VLC_OBJECT(a), b, c, \
                                          SOCK_STREAM, IPPROTO_TCP)
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static inline int net_ConnectTCP (vlc_object_t *obj, const char *host, int port)
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{
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    return net_Connect (obj, host, port, SOCK_STREAM, IPPROTO_TCP);
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}
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#define net_ConnectTCP(a, b, c) net_ConnectTCP(VLC_OBJECT(a), b, c)
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VLC_API int net_AcceptSingle(vlc_object_t *obj, int lfd);
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VLC_API int net_Accept( vlc_object_t *, int * );
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#define net_Accept(a, b) \
        net_Accept(VLC_OBJECT(a), b)
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VLC_API int net_ConnectDgram( vlc_object_t *p_this, const char *psz_host, int i_port, int hlim, int proto );
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#define net_ConnectDgram(a, b, c, d, e ) \
        net_ConnectDgram(VLC_OBJECT(a), b, c, d, e)
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static inline int net_ConnectUDP (vlc_object_t *obj, const char *host, int port, int hlim)
{
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    return net_ConnectDgram (obj, host, port, hlim, IPPROTO_UDP);
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}
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VLC_API int net_OpenDgram( vlc_object_t *p_this, const char *psz_bind, int i_bind, const char *psz_server, int i_server, int proto );
#define net_OpenDgram( a, b, c, d, e, g ) \
        net_OpenDgram(VLC_OBJECT(a), b, c, d, e, g)
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static inline int net_ListenUDP1 (vlc_object_t *obj, const char *host, int port)
{
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    return net_OpenDgram (obj, host, port, NULL, 0, IPPROTO_UDP);
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}
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VLC_API void net_ListenClose( int *fd );
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int net_Subscribe (vlc_object_t *obj, int fd, const struct sockaddr *addr,
                   socklen_t addrlen);
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VLC_API int net_SetCSCov( int fd, int sendcov, int recvcov );
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/* Functions to read from or write to the networking layer */
struct virtual_socket_t
{
    void *p_sys;
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    int (*pf_recv) ( void *, void *, size_t );
    int (*pf_send) ( void *, const void *, size_t );
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};

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VLC_API ssize_t net_Read( vlc_object_t *p_this, int fd, const v_socket_t *, void *p_data, size_t i_data, bool b_retry );
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#define net_Read(a,b,c,d,e,f) net_Read(VLC_OBJECT(a),b,c,d,e,f)
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VLC_API ssize_t net_Write( vlc_object_t *p_this, int fd, const v_socket_t *, const void *p_data, size_t i_data );
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#define net_Write(a,b,c,d,e) net_Write(VLC_OBJECT(a),b,c,d,e)
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VLC_API char * net_Gets( vlc_object_t *p_this, int fd, const v_socket_t * );
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#define net_Gets(a,b,c) net_Gets(VLC_OBJECT(a),b,c)
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VLC_API ssize_t net_Printf( vlc_object_t *p_this, int fd, const v_socket_t *, const char *psz_fmt, ... ) VLC_FORMAT( 4, 5 );
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#define net_Printf(o,fd,vs,...) net_Printf(VLC_OBJECT(o),fd,vs, __VA_ARGS__)
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VLC_API ssize_t net_vaPrintf( vlc_object_t *p_this, int fd, const v_socket_t *, const char *psz_fmt, va_list args );
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#define net_vaPrintf(a,b,c,d,e) net_vaPrintf(VLC_OBJECT(a),b,c,d,e)
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#ifdef WIN32
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/* Microsoft: same semantic, same value, different name... go figure */
# define SHUT_RD SD_RECEIVE
# define SHUT_WR SD_SEND
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# define SHUT_RDWR SD_BOTH
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# define net_Close( fd ) closesocket ((SOCKET)fd)
#else
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# ifdef __OS2__
#  define SHUT_RD    0
#  define SHUT_WR    1
#  define SHUT_RDWR  2
# endif
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# define net_Close( fd ) (void)close (fd)
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#endif

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/* Portable network names/addresses resolution layer */

/* GAI error codes */
# ifndef EAI_BADFLAGS
#  define EAI_BADFLAGS -1
# endif
# ifndef EAI_NONAME
#  define EAI_NONAME -2
# endif
# ifndef EAI_AGAIN
#  define EAI_AGAIN -3
# endif
# ifndef EAI_FAIL
#  define EAI_FAIL -4
# endif
# ifndef EAI_NODATA
#  define EAI_NODATA -5
# endif
# ifndef EAI_FAMILY
#  define EAI_FAMILY -6
# endif
# ifndef EAI_SOCKTYPE
#  define EAI_SOCKTYPE -7
# endif
# ifndef EAI_SERVICE
#  define EAI_SERVICE -8
# endif
# ifndef EAI_ADDRFAMILY
#  define EAI_ADDRFAMILY -9
# endif
# ifndef EAI_MEMORY
#  define EAI_MEMORY -10
# endif
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#ifndef EAI_OVERFLOW
#  define EAI_OVERFLOW -11
#endif
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# ifndef EAI_SYSTEM
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#  define EAI_SYSTEM -12
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# endif


# ifndef NI_MAXHOST
#  define NI_MAXHOST 1025
#  define NI_MAXSERV 32
# endif
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# define NI_MAXNUMERICHOST 64
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#ifndef AI_NUMERICSERV
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# define AI_NUMERICSERV 0
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#endif

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#ifdef __OS2__
# ifndef NI_NUMERICHOST
#  define NI_NUMERICHOST 0x01
#  define NI_NUMERICSERV 0x02
#  define NI_NOFQDN      0x04
#  define NI_NAMEREQD    0x08
#  define NI_DGRAM       0x10
# endif

struct 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 addrinfo *ai_next;
};

# define AI_PASSIVE     1
# define AI_CANONNAME   2
# define AI_NUMERICHOST 4

VLC_API const char *gai_strerror( int errnum );

VLC_API int  getaddrinfo ( const char *, const char *,
                           const struct addrinfo *, struct addrinfo ** );
VLC_API void freeaddrinfo( struct addrinfo * );
VLC_API int  getnameinfo ( const struct sockaddr *, socklen_t,
                           char *, int, char *, int, int );
#endif

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VLC_API int vlc_getnameinfo( const struct sockaddr *, int, char *, int, int *, int );
VLC_API int vlc_getaddrinfo( vlc_object_t *, const char *, int, const struct addrinfo *, struct addrinfo ** );
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#ifdef __OS2__
/* OS/2 does not support IPv6, yet. But declare these only for compilation */
struct in6_addr
{
    uint8_t s6_addr[16];
};

struct sockaddr_in6
{
    uint8_t         sin6_len;
    uint8_t         sin6_family;
    uint16_t        sin6_port;
    uint32_t        sin6_flowinfo;
    struct in6_addr sin6_addr;
    uint32_t        sin6_scope_id;
};

# define IN6_IS_ADDR_MULTICAST(a)   (((__const uint8_t *) (a))[0] == 0xff)

static const struct in6_addr in6addr_any =
    { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } };
#endif

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static inline bool
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net_SockAddrIsMulticast (const struct sockaddr *addr, socklen_t len)
{
    switch (addr->sa_family)
    {
#ifdef IN_MULTICAST
        case AF_INET:
        {
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            const struct sockaddr_in *v4 = (const struct sockaddr_in *)addr;
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            if ((size_t)len < sizeof (*v4))
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                return false;
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            return IN_MULTICAST (ntohl (v4->sin_addr.s_addr)) != 0;
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        }
#endif

#ifdef IN6_IS_ADDR_MULTICAST
        case AF_INET6:
        {
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            const struct sockaddr_in6 *v6 = (const struct sockaddr_in6 *)addr;
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            if ((size_t)len < sizeof (*v6))
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                return false;
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            return IN6_IS_ADDR_MULTICAST (&v6->sin6_addr) != 0;
        }
#endif
    }

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    return false;
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}


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static inline int net_GetSockAddress( int fd, char *address, int *port )
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{
    struct sockaddr_storage addr;
    socklen_t addrlen = sizeof( addr );

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    return getsockname( fd, (struct sockaddr *)&addr, &addrlen )
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        || vlc_getnameinfo( (struct sockaddr *)&addr, addrlen, address,
                            NI_MAXNUMERICHOST, port, NI_NUMERICHOST )
        ? VLC_EGENERIC : 0;
}
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static inline int net_GetPeerAddress( int fd, char *address, int *port )
{
    struct sockaddr_storage addr;
    socklen_t addrlen = sizeof( addr );
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    return getpeername( fd, (struct sockaddr *)&addr, &addrlen )
        || vlc_getnameinfo( (struct sockaddr *)&addr, addrlen, address,
                            NI_MAXNUMERICHOST, port, NI_NUMERICHOST )
        ? VLC_EGENERIC : 0;
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}

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static inline uint16_t net_GetPort (const struct sockaddr *addr)
{
    switch (addr->sa_family)
    {
#ifdef AF_INET6
        case AF_INET6:
            return ((const struct sockaddr_in6 *)addr)->sin6_port;
#endif
        case AF_INET:
            return ((const struct sockaddr_in *)addr)->sin_port;
    }
    return 0;
}

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static inline void net_SetPort (struct sockaddr *addr, uint16_t port)
{
    switch (addr->sa_family)
    {
#ifdef AF_INET6
        case AF_INET6:
            ((struct sockaddr_in6 *)addr)->sin6_port = port;
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        break;
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#endif
        case AF_INET:
            ((struct sockaddr_in *)addr)->sin_port = port;
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        break;
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    }
}
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# ifdef __cplusplus
}
# endif

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#endif