OpenSceneGraph/examples/osgcluster/broadcaster.cpp

#include <stdio.h>
#include <fcntl.h>
#include <sys/types.h>

#if !defined (WIN32) || defined(__CYGWIN__)
#include <sys/ioctl.h>
#include <sys/uio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <sys/time.h>
#include <net/if.h>
#include <netdb.h>
#endif

#include <string.h>

#if defined(__linux)
    #include <unistd.h>
    #include <linux/sockios.h>
#elif defined(__FreeBSD__)
    #include <unistd.h>
    #include <sys/sockio.h>
#elif defined(__sgi)
    #include <unistd.h>
    #include <net/soioctl.h>
#elif defined(__CYGWIN__) 
    #include <unistd.h>
#elif defined(__sun) 
    #include <unistd.h>
    #include <sys/sockio.h>
#elif defined (__APPLE__)
    #include <unistd.h>
    #include <sys/sockio.h>
#elif defined (WIN32)
    #include <winsock.h>
    #include <stdio.h>
#elif defined (__hpux__)
    #include <unistd.h>
#else
    #error Teach me how to build on this system
#endif

#include "broadcaster.h"

#define _VERBOSE 1

Broadcaster::Broadcaster( void )
{
    _port = 0;
    _initialized = false;
    _buffer = 0L;
    _address = 0;
}

Broadcaster::~Broadcaster( void )
{
#if defined (WIN32) && !defined(__CYGWIN__)
    closesocket( _so);
#else
    close( _so );
#endif
}

bool Broadcaster::init( void )
{
#if defined (WIN32) && !defined(__CYGWIN__)
    WORD version = MAKEWORD(1,1);
    WSADATA wsaData;
    // First, we start up Winsock
    WSAStartup(version, &wsaData);
#endif

    if( _port == 0 )
    {
        fprintf( stderr, "Broadcaster::init() - port not defined\n" );
        return false;
    }

    if( (_so = socket( AF_INET, SOCK_DGRAM, 0 )) < 0 )
    {
        perror( "Socket" );
        return false;
    }
#if defined (WIN32) && !defined(__CYGWIN__)
    const BOOL on = TRUE;
#else
    int on = 1;
#endif

#if defined (WIN32) && !defined(__CYGWIN__)
    setsockopt( _so, SOL_SOCKET, SO_REUSEADDR, (const char *) &on, sizeof(int));
#else
    setsockopt( _so, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
#endif

    saddr.sin_family = AF_INET;
    saddr.sin_port   = htons( _port );
    if( _address == 0 )
    {
#if defined (WIN32) && !defined(__CYGWIN__)
        setsockopt( _so, SOL_SOCKET, SO_BROADCAST, (const char *) &on, sizeof(int));
#else
        setsockopt( _so, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on));
#endif

#if !defined (WIN32) || defined(__CYGWIN__)
        struct ifreq ifr;
#endif
#if defined (__linux) || defined(__CYGWIN__)
        strcpy( ifr.ifr_name, "eth0" );
#elif defined(__sun)
        strcpy( ifr.ifr_name, "hme0" );
#elif !defined (WIN32)
        strcpy( ifr.ifr_name, "ef0" );
#endif
#if defined (WIN32) // get the server address
        saddr.sin_addr.s_addr = htonl(INADDR_BROADCAST);
    }
#else
        if( (ioctl( _so, SIOCGIFBRDADDR, &ifr)) < 0 )
        {
            perror( "Broadcaster::init() Cannot get Broadcast Address" );
            return false;
        }
            saddr.sin_addr.s_addr = (((sockaddr_in *)&ifr.ifr_broadaddr)->sin_addr.s_addr);
        }
        else
        {
            saddr.sin_addr.s_addr = _address;
        }
#endif
#define _VERBOSE 1
#ifdef _VERBOSE
    unsigned char *ptr = (unsigned char *)&saddr.sin_addr.s_addr;
    printf( "Broadcast address : %u.%u.%u.%u\n", ptr[0], ptr[1], ptr[2], ptr[3] );
#endif

    _initialized = true;
    return _initialized;
}

void Broadcaster::setHost( const char *hostname )
{
    struct hostent *h;
    if( (h = gethostbyname( hostname )) == 0L )
    {
        fprintf( stderr, "Broadcaster::setHost() - Cannot resolv an address for \"%s\".\n", hostname );
        _address = 0;
    }
    else
        _address = *(( unsigned long  *)h->h_addr);
}

void Broadcaster::setPort( const short port )
{
    _port = port;
}

void Broadcaster::setBuffer( void *buffer, const unsigned int size )
{
    _buffer = buffer;
    _buffer_size = size;
}

void Broadcaster::sync( void )
{
    if(!_initialized) init();

    if( _buffer == 0L )
    {
        fprintf( stderr, "Broadcaster::sync() - No buffer\n" );
        return;
    }

#if defined (WIN32) && !defined(__CYGWIN__)
    unsigned int size = sizeof( SOCKADDR_IN );
    sendto( _so, (const char *)_buffer, _buffer_size, 0, (struct sockaddr *)&saddr, size );
    int err = WSAGetLastError ();
    int *dum = (int*) _buffer;
#else
    unsigned int size = sizeof( struct sockaddr_in );
    sendto( _so, (const void *)_buffer, _buffer_size, 0, (struct sockaddr *)&saddr, size );
#endif

}