vlc_network.h

/*****************************************************************************
 * vlc_network.h: interface to communicate with network plug-ins
 *****************************************************************************
 * Copyright (C) 2002-2005 VLC authors and VideoLAN
 * Copyright © 2006-2007 Rémi Denis-Courmont
 * $Id$
 *
 * Authors: Christophe Massiot <massiot@via.ecp.fr>
 *          Laurent Aimar <fenrir@via.ecp.fr>
 *          Rémi Denis-Courmont <rem # videolan.org>
 *
 * 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
 * (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 Lesser General Public License for more details.
 *
 * 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.
 *****************************************************************************/

#ifndef VLC_NETWORK_H
# define VLC_NETWORK_H

/**
 * \ingroup file
 * \defgroup sockets Internet sockets
 * @{
 * \file
 * Definitions for sockets and low-level networking
 */

#if defined( _WIN32 )
#   define _NO_OLDNAMES 1
#   include <io.h>
#   include <winsock2.h>
#   include <ws2tcpip.h>
#   define net_errno (WSAGetLastError())

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;
};

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

#ifndef MSG_NOSIGNAL
# define MSG_NOSIGNAL 0
#endif

VLC_API int vlc_socket (int, int, int, bool nonblock) VLC_USED;

struct sockaddr;
VLC_API int vlc_accept( int, struct sockaddr *, socklen_t *, bool ) VLC_USED;

# ifdef __cplusplus
extern "C" {
# endif

/* Portable networking layer communication */
int net_Socket (vlc_object_t *obj, int family, int socktype, int proto);

VLC_API int net_Connect(vlc_object_t *p_this, const char *psz_host, int i_port, int socktype, int protocol);
#define net_Connect(a, b, c, d, e) net_Connect(VLC_OBJECT(a), b, c, d, e)

VLC_API int * net_Listen(vlc_object_t *p_this, const char *psz_host, int i_port, int socktype, int protocol);

#define net_ListenTCP(a, b, c) net_Listen(VLC_OBJECT(a), b, c, \
                                          SOCK_STREAM, IPPROTO_TCP)

static inline int net_ConnectTCP (vlc_object_t *obj, const char *host, int port)
{
    return net_Connect (obj, host, port, SOCK_STREAM, IPPROTO_TCP);
}
#define net_ConnectTCP(a, b, c) net_ConnectTCP(VLC_OBJECT(a), b, c)

VLC_API int net_AcceptSingle(vlc_object_t *obj, int lfd);

VLC_API int net_Accept( vlc_object_t *, int * );
#define net_Accept(a, b) \
        net_Accept(VLC_OBJECT(a), b)

VLC_API int net_ConnectDgram( vlc_object_t *p_this, const char *psz_host, int i_port, int hlim, int proto );
#define net_ConnectDgram(a, b, c, d, e ) \
        net_ConnectDgram(VLC_OBJECT(a), b, c, d, e)

static inline int net_ConnectUDP (vlc_object_t *obj, const char *host, int port, int hlim)
{
    return net_ConnectDgram (obj, host, port, hlim, IPPROTO_UDP);
}

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)

static inline int net_ListenUDP1 (vlc_object_t *obj, const char *host, int port)
{
    return net_OpenDgram (obj, host, port, NULL, 0, IPPROTO_UDP);
}

VLC_API void net_ListenClose( int *fd );

int net_Subscribe (vlc_object_t *obj, int fd, const struct sockaddr *addr,
                   socklen_t addrlen);

VLC_API int net_SetCSCov( int fd, int sendcov, int recvcov );

/* Functions to read from or write to the networking layer */
struct virtual_socket_t
{
    void *p_sys;
    int (*pf_recv) ( void *, void *, size_t );
    int (*pf_send) ( void *, const void *, size_t );
};

VLC_API ssize_t net_Read( vlc_object_t *p_this, int fd, void *p_data, size_t i_data );
#define net_Read(a,b,c,d) net_Read(VLC_OBJECT(a),b,c,d)
VLC_API ssize_t net_Write( vlc_object_t *p_this, int fd, const void *p_data, size_t i_data );
#define net_Write(a,b,c,d) net_Write(VLC_OBJECT(a),b,c,d)
VLC_API char * net_Gets( vlc_object_t *p_this, int fd );
#define net_Gets(a,b) net_Gets(VLC_OBJECT(a),b)


VLC_API ssize_t net_Printf( vlc_object_t *p_this, int fd, const char *psz_fmt, ... ) VLC_FORMAT( 3, 4 );
#define net_Printf(o,fd,...) net_Printf(VLC_OBJECT(o),fd, __VA_ARGS__)
VLC_API ssize_t net_vaPrintf( vlc_object_t *p_this, int fd, const char *psz_fmt, va_list args );
#define net_vaPrintf(a,b,c,d) net_vaPrintf(VLC_OBJECT(a),b,c,d)

#ifdef _WIN32
/* Microsoft: same semantic, same value, different name... go figure */
# define SHUT_RD SD_RECEIVE
# define SHUT_WR SD_SEND
# define SHUT_RDWR SD_BOTH
# define net_Close( fd ) closesocket ((SOCKET)fd)
#else
# ifdef __OS2__
#  define SHUT_RD    0
#  define SHUT_WR    1
#  define SHUT_RDWR  2
# endif
# define net_Close( fd ) (void)close (fd)
#endif

/* 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
#ifndef EAI_OVERFLOW
#  define EAI_OVERFLOW -11
#endif
# ifndef EAI_SYSTEM
#  define EAI_SYSTEM -12
# endif


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

#ifndef AI_NUMERICSERV
# define AI_NUMERICSERV 0
#endif
#ifndef AI_IDN
# define AI_IDN 0 /* GNU/libc extension */
#endif

#ifdef _WIN32
# undef gai_strerror
# define gai_strerror gai_strerrorA
#endif

#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

# 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

VLC_API int vlc_getnameinfo( const struct sockaddr *, int, char *, int, int *, int );
VLC_API int vlc_getaddrinfo (const char *, unsigned,
                             const struct addrinfo *, struct addrinfo **);


#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

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

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

    return false;
}


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

    return getsockname( fd, (struct sockaddr *)&addr, &addrlen )
        || vlc_getnameinfo( (struct sockaddr *)&addr, addrlen, address,
                            NI_MAXNUMERICHOST, port, NI_NUMERICHOST )
        ? VLC_EGENERIC : 0;
}

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

    return getpeername( fd, (struct sockaddr *)&addr, &addrlen )
        || vlc_getnameinfo( (struct sockaddr *)&addr, addrlen, address,
                            NI_MAXNUMERICHOST, port, NI_NUMERICHOST )
        ? VLC_EGENERIC : 0;
}

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;
}

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;
        break;
#endif
        case AF_INET:
            ((struct sockaddr_in *)addr)->sin_port = port;
        break;
    }
}

VLC_API char *vlc_getProxyUrl(const char *);

# ifdef __cplusplus
}
# endif

/** @} */

#endif