ipv6.c

video linux conference

    /* Join the multicast group if the socket is a multicast address */
#if defined( WIN32 ) || defined( HAVE_IF_NAMETOINDEX )
    if( IN6_IS_ADDR_MULTICAST(&sock.sin6_addr) )
    {
        struct ipv6_mreq     imr;
        int                  res;

        imr.ipv6mr_interface = sock.sin6_scope_id;
        imr.ipv6mr_multiaddr = sock.sin6_addr;
        res = setsockopt(i_handle, IPPROTO_IPV6, IPV6_JOIN_GROUP, (void*) &imr,
#if defined(WIN32)
                         sizeof(imr) + 4); /* Doesn't work without this */
#else
                         sizeof(imr));
#endif

        if( res == -1 )
        {
            msg_Err( p_this, "cannot join multicast group" );
        } 
    }
#else
    msg_Warn( p_this, "Multicast IPv6 is not supported on your OS" );
#endif


    if( *psz_server_addr )
    {
        int ttl = p_socket->i_ttl;
        if( ttl < 1 )
        {
            ttl = config_GetInt( p_this, "ttl" );
        }
        if( ttl < 1 ) ttl = 1;

        /* Build socket for remote connection */
        if ( BuildAddr( p_this, &sock, psz_server_addr, i_server_port ) == -1 )
        {
            msg_Warn( p_this, "cannot build remote address" );
            close( i_handle );
            return( -1 );
        }

        /* Connect the socket */
        if( connect( i_handle, (struct sockaddr *) &sock,
                     sizeof( sock ) ) == (-1) )
        {
            msg_Warn( p_this, "cannot connect socket (%s)", strerror(errno) );
            close( i_handle );
            return( -1 );
        }

        /* Set the time-to-live */
        if( ttl > 1 )
        {
#if defined( WIN32 ) || defined( HAVE_IF_NAMETOINDEX )
            if( IN6_IS_ADDR_MULTICAST(&sock.sin6_addr) )
            {
                if( setsockopt( i_handle, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
                                (void *)&ttl, sizeof( ttl ) ) < 0 )
                {
#ifdef HAVE_ERRNO_H
                    msg_Err( p_this, "failed to set multicast ttl (%s)",
                             strerror(errno) );
#else
                    msg_Err( p_this, "failed to set multicast ttl" );
#endif
                }
            }
            else
#endif
            {
                if( setsockopt( i_handle, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
                                (void *)&ttl, sizeof( ttl ) ) < 0 )
                {
#ifdef HAVE_ERRNO_H
                    msg_Err( p_this, "failed to set unicast ttl (%s)",
                              strerror(errno) );
#else
                    msg_Err( p_this, "failed to set unicast ttl" );
#endif
                }
            }
        }
    }

    p_socket->i_handle = i_handle;

    var_Create( p_this, "mtu", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
    var_Get( p_this, "mtu", &val );
    p_socket->i_mtu = val.i_int;

    return( 0 );
}

/*****************************************************************************
 * SocketTCP: create a TCP socket
 *****************************************************************************
 * This function returns -1 in case of error.
 *****************************************************************************/
static int SocketTCP( vlc_object_t * p_this )
{
    int i_handle;
    
    /* Open a SOCK_STREAM (TCP) socket, in the PF_INET6 domain, automatic (0)
     * protocol */
    if( (i_handle = socket( PF_INET6, SOCK_STREAM, 0 )) == -1 )
    {
#ifdef HAVE_ERRNO_H
        msg_Warn( p_this, "cannot create socket (%s)", strerror(errno) );
#else
        msg_Warn( p_this, "cannot create socket" );
#endif
        return -1;
    }

    /* Set to non-blocking */
#if defined( WIN32 ) || defined( UNDER_CE )
    {
        unsigned long i_dummy = 1;
        if( ioctlsocket( i_handle, FIONBIO, &i_dummy ) != 0 )
        {
            msg_Err( p_this, "cannot set socket to non-blocking mode" );
        }
    }
#elif defined( HAVE_ERRNO_H )
    {
        int i_flags;
        if( ( i_flags = fcntl( i_handle, F_GETFL, 0 ) ) < 0 ||
            fcntl( i_handle, F_SETFL, i_flags | O_NONBLOCK ) < 0 )
        {
            msg_Err( p_this, "cannot set socket to non-blocking mode" );
        }
    }
#endif

    return i_handle;
}

/*****************************************************************************
 * OpenTCP: open a TCP socket
 *****************************************************************************
 * psz_server_addr, i_server_port : address and port used for the connect()
 *   system call. If i_server_port == 0, 80 is used.
 * Other parameters are ignored.
 * This function returns -1 in case of error.
 *****************************************************************************/
static int OpenTCP( vlc_object_t * p_this, network_socket_t * p_socket )
{
    char * psz_server_addr = p_socket->psz_server_addr;
    int i_server_port = p_socket->i_server_port;

    int i_handle;
    struct sockaddr_in6 sock;

    if( i_server_port == 0 )
    {
        i_server_port = 80;
    }

    if( (i_handle = SocketTCP( p_this )) == -1 )
        return VLC_EGENERIC;

    /* Build remote address */
    if ( BuildAddr( p_this, &sock, psz_server_addr, i_server_port ) == -1 )
        goto error;

    /* Connect the socket */
    if( connect( i_handle, (struct sockaddr *) &sock, sizeof( sock ) ) == -1 )
    {
#if defined( WIN32 ) || defined( UNDER_CE )
        if( WSAGetLastError() == WSAEWOULDBLOCK )
#elif defined( HAVE_ERRNO_H )
        if( errno == EINPROGRESS )
#else
        if( 0 )
#endif
        {
            int i_ret, i_opt, i_opt_size = sizeof( i_opt ), i_max_count;
            struct timeval timeout;
            vlc_value_t val;
            fd_set fds;

            /* FIXME: There is no ipv6-timeout option, so we use ipv4-timeout
             * instead */
            if( !var_Type( p_this, "ipv4-timeout" ) )
            {
                var_Create( p_this, "ipv4-timeout",
                            VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
            }
            var_Get( p_this, "ipv4-timeout", &val );
            i_max_count = val.i_int * 1000 / 100000 /* timeout.tv_usec */;

            msg_Dbg( p_this, "connection in progress" );
            do
            {
                if( p_this->b_die || i_max_count <= 0 )
                {
                    msg_Dbg( p_this, "connection aborted" );
                    goto error;
                }

                i_max_count--;

                /* Initialize file descriptor set */
                FD_ZERO( &fds );
                FD_SET( i_handle, &fds );

                /* We'll wait 0.1 second if nothing happens */
                timeout.tv_sec = 0;
                timeout.tv_usec = 100000;

            } while( ( i_ret = select( i_handle + 1, NULL, &fds, NULL,
                                       &timeout ) ) == 0 ||
#if defined( WIN32 ) || defined( UNDER_CE )
                     ( i_ret < 0 && WSAGetLastError() == WSAEWOULDBLOCK ) );
#elif defined( HAVE_ERRNO_H )
                     ( i_ret < 0 && errno == EINTR ) );
#else
                     ( i_ret < 0 ) );
#endif

            if( i_ret < 0 )
            {
                msg_Warn( p_this, "cannot connect socket (select failed)" );
                goto error;
            }

#if !defined( SYS_BEOS )
            if( getsockopt( i_handle, SOL_SOCKET, SO_ERROR, (void*)&i_opt,
                            &i_opt_size ) == -1 || i_opt != 0 )
            {
                msg_Warn( p_this, "cannot connect socket (SO_ERROR)" );
                goto error;
            }
#endif
        }
        else
        {
#if defined( HAVE_ERRNO_H )
            msg_Warn( p_this, "cannot connect socket (%s)", strerror(errno) );
#else
            msg_Warn( p_this, "cannot connect socket" );
#endif
            goto error;
        }
    }

    p_socket->i_handle = i_handle;
    p_socket->i_mtu = 0; /* There is no MTU notion in TCP */
    return VLC_SUCCESS;

error:
    close( i_handle );
    return VLC_EGENERIC;
}

/*****************************************************************************
 * ListenTCP: open a TCP passive socket (server-side)
 *****************************************************************************
 * psz_server_addr, i_server_port : address and port used for the bind()
 *   system call. If i_server_port == 0, 80 is used.
 * Other parameters are ignored.
 * This function returns -1 in case of error.
 *****************************************************************************/
static int ListenTCP( vlc_object_t * p_this, network_socket_t * p_socket )
{
    char * psz_server_addr = p_socket->psz_server_addr;
    int i_server_port = p_socket->i_server_port;

    int i_handle, i_dummy = 1;
    struct sockaddr_in6 sock;

    if( (i_handle = SocketTCP( p_this )) == -1 )
        return VLC_EGENERIC;

    if ( setsockopt( i_handle, SOL_SOCKET, SO_REUSEADDR,
                (void *)&i_dummy, sizeof( i_dummy ) ) == -1 )
    {
        msg_Warn( p_this, "cannot configure socket (SO_REUSEADDR)" );
    }

    /* Build remote address */
    if ( BuildAddr( p_this, &sock, psz_server_addr, i_server_port ) == -1 )
    {
        msg_Dbg( p_this, "could not build local address" );
        return VLC_EGENERIC;
    }
    
    /* Bind the socket */
    if( bind( i_handle, (struct sockaddr *) &sock, sizeof( sock )) == -1 )
    {
#ifdef HAVE_ERRNO_H
        msg_Err( p_this, "cannot bind socket (%s)", strerror(errno) );
#else
        msg_Err( p_this, "cannot bind socket" );
#endif
        goto error;
    }
 
    /* Listen */
    if( listen( i_handle, 100 ) == -1 )
    {
#ifdef HAVE_ERRNO_H
         msg_Err( p_this, "cannot bring the socket in listening mode (%s)",
                  strerror(errno) );
#else
         msg_Err( p_this, "cannot bring the socket in listening mode" );
#endif
         goto error;
    }

    p_socket->i_handle = i_handle;
    p_socket->i_mtu = 0; /* There is no MTU notion in TCP */
    return VLC_SUCCESS;

error:
    close( i_handle );
    return VLC_EGENERIC;
}

/*****************************************************************************
 * NetOpen: wrapper around OpenUDP, ListenTCP and OpenTCP
 *****************************************************************************/
static int NetOpen( vlc_object_t * p_this )
{
    network_socket_t * p_socket = p_this->p_private;

    if( p_socket->i_type == NETWORK_UDP )
    {
        return OpenUDP( p_this, p_socket );
    }
    else if( p_socket->i_type == NETWORK_TCP_PASSIVE )
    {
        return ListenTCP( p_this, p_socket );
    }
    else
    {
        return OpenTCP( p_this, p_socket );
    }
}