ipv4.c

video linux conference

         }
         /* If there is no source address, we use IP_ADD_MEMBERSHIP */
         else
         {
             struct ip_mreq imr;

             imr.imr_multiaddr.s_addr = sock.sin_addr.s_addr;
             if( psz_if_addr != NULL && *psz_if_addr
                && inet_addr(psz_if_addr) != INADDR_NONE )
            {
                imr.imr_interface.s_addr = inet_addr(psz_if_addr);
            }
            else
            {
                imr.imr_interface.s_addr = INADDR_ANY;
            }
            if( psz_if_addr != NULL ) free( psz_if_addr );

            msg_Dbg( p_this, "IP_ADD_MEMBERSHIP multicast request" );
            /* Join Multicast group without source filter */
            if( setsockopt( i_handle, IPPROTO_IP, IP_ADD_MEMBERSHIP,
                            (char*)&imr, sizeof(struct ip_mreq) ) == -1 )
            {
#if defined(WIN32) || defined(UNDER_CE)
                msg_Err( p_this, "failed to join IP multicast group (%i)",
                         WSAGetLastError() );
#else
                msg_Err( p_this, "failed to join IP multicast group (%s)",
                                  strerror(errno) );
#endif
                close( i_handle );
                return( -1 );
            }
         }
    }
#endif

    if( *psz_server_addr )
    {
        /* Build socket for remote connection */
        if ( BuildAddr( &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) )
        {
#if defined(WIN32) || defined(UNDER_CE)
            msg_Warn( p_this, "cannot connect socket (%i)", WSAGetLastError());
#else
            msg_Warn( p_this, "cannot connect socket (%s)", strerror(errno) );
#endif
            close( i_handle );
            return( -1 );
        }

#if !defined( SYS_BEOS )
        if( IN_MULTICAST( ntohl(inet_addr(psz_server_addr) ) ) )
        {
            /* set the time-to-live */
            int i_ttl = p_socket->i_ttl;
            unsigned char ttl;
            
            /* set the multicast interface */
            char * psz_mif_addr = config_GetPsz( p_this, "miface-addr" );
            if( psz_mif_addr )
            {
                struct in_addr intf;
                intf.s_addr = inet_addr(psz_mif_addr);
                free( psz_mif_addr  );

                if( setsockopt( i_handle, IPPROTO_IP, IP_MULTICAST_IF,
                                &intf, sizeof( intf ) ) < 0 )
                {
                    msg_Dbg( p_this, "failed to set multicast interface (%s).", strerror(errno) );
                    close( i_handle );
                    return ( -1 );
                }
            }

            if( i_ttl < 1 )
            {
                if( var_Get( p_this, "ttl", &val ) != VLC_SUCCESS )
                {
                    var_Create( p_this, "ttl",
                                VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
                    var_Get( p_this, "ttl", &val );
                }
                i_ttl = val.i_int;
            }
            if( i_ttl < 1 ) i_ttl = 1;
            ttl = (unsigned char) i_ttl;

            /* There is some confusion in the world whether IP_MULTICAST_TTL 
             * takes a byte or an int as an argument.
             * BSD seems to indicate byte so we are going with that and use
             * int as a fallback to be safe */
            if( setsockopt( i_handle, IPPROTO_IP, IP_MULTICAST_TTL,
                            &ttl, sizeof( ttl ) ) < 0 )
            {
                msg_Dbg( p_this, "failed to set ttl (%s). Let's try it "
                         "the integer way.", strerror(errno) );
                if( setsockopt( i_handle, IPPROTO_IP, IP_MULTICAST_TTL,
                                &i_ttl, sizeof( i_ttl ) ) <0 )
                {
                    msg_Err( p_this, "failed to set ttl (%s)",
                             strerror(errno) );
                    close( i_handle );
                    return( -1 );
                }
            }
        }
#endif
    }

    p_socket->i_handle = i_handle;

    if( var_Get( p_this, "mtu", &val ) != VLC_SUCCESS )
    {
        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_INET domain, automatic (0)
     * protocol */
    if( (i_handle = socket( PF_INET, SOCK_STREAM, 0 )) == -1 )
    {
#if defined(WIN32) || defined(UNDER_CE)
        msg_Warn( p_this, "cannot create socket (%i)", WSAGetLastError() );
#else
        msg_Warn( p_this, "cannot create socket (%s)", strerror(errno) );
#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" );
        }
    }
#else
    {
        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_in 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( &sock, psz_server_addr, i_server_port ) == -1 )
    {
        msg_Dbg( p_this, "could not build local address" );
        goto error;
    }

    /* Connect the socket */
    if( connect( i_handle, (struct sockaddr *) &sock, sizeof( sock ) ) == -1 )
    {
#if defined( WIN32 ) || defined( UNDER_CE )
        if( WSAGetLastError() == WSAEWOULDBLOCK )
#else
        if( errno == EINPROGRESS )
#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;

            if( var_Get( p_this, "ipv4-timeout", &val ) != VLC_SUCCESS )
            {
                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 ) );
#else
                     ( i_ret < 0 && errno == EINTR ) );
#endif

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

#if !defined( SYS_BEOS ) && !defined( UNDER_CE )
            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(WIN32) || defined(UNDER_CE)
            msg_Warn( p_this, "cannot connect socket (%i)", WSAGetLastError());
#else
            msg_Warn( p_this, "cannot connect socket (%s)", strerror(errno) );
#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_in 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( &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 )
    {
#if defined(WIN32) || defined(UNDER_CE)
        msg_Err( p_this, "cannot bind socket (%i)", WSAGetLastError());
#else
        msg_Err( p_this, "cannot bind socket (%s)", strerror(errno) );
#endif
        goto error;
    }
 
    /* Listen */
    if( listen( i_handle, 100 ) == -1 )
    {
#if defined(WIN32) || defined(UNDER_CE)
        msg_Err( p_this, "cannot bring socket in listening mode (%i)",
                 WSAGetLastError());
#else
        msg_Err( p_this, "cannot bring the socket in listening mode (%s)",
                 strerror(errno) );
#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 );
    }
}