好久都没有来看看了，研究下这个代码再说

khyang

ps,忘了从哪里找到的了!!!

/*
* Program to test new [sg]etsockopts and ioctls for manipulating IP and
* Ethernet multicast address filters.
* You can watch the IGMP messages on the network by also running a trace
* tool such as tcpdump.
*
* Written by Steve Deering, Stanford University, February 1989.
*
* The code compiles "as-is" under 4.4BSD.
* For Solaris 2.5 you need to add a #include of  and then
* "cc mtest.c -lsocket -lnsl".
*/
#define MULTICAST
#include
#include
#include
#include
#include
#include
main( argc, argv )
    int argc;
    char **argv;
  {
    int so;
    char line[80];
    char *lineptr;
    struct ip_mreq imr;
    struct ifreq ifr;
    int n, f;
    unsigned i1, i2, i3, i4, g1, g2, g3, g4;
    unsigned e1, e2, e3, e4, e5, e6;
    if( (so = socket( AF_INET, SOCK_DGRAM, 0 )) == -1)
      {
perror( "can't open socket" );
exit( 1 );
      }
    printf( "multicast membership test program; " );
    printf( "enter ? for list of commands\n" );
    while( fgets( line, 79, stdin ) != NULL )
      {
lineptr = line;
while( *lineptr == ' ' || *lineptr == '\t' ) ++lineptr;
switch( *lineptr )
   {
     case '?':
       {
  printf( "%s%s%s%s%s%s%s",
  " j g.g.g.g i.i.i.i      - join  IP  multicast group     \n",
  " l g.g.g.g i.i.i.i      - leave IP  multicast group     \n",
  " a ifname e.e.e.e.e.e   - add ether multicast address   \n",
  " d ifname e.e.e.e.e.e   - del ether multicast address   \n",
  " m ifname 1/0           - set/clear ether allmulti flag \n",
  " p ifname 1/0           - set/clear ether promisc flag  \n",
  " q                      - quit                      \n\n" );
  break;
       }
     case 'j':
       {
  ++lineptr;
  while( *lineptr == ' ' || *lineptr == '\t' ) ++lineptr;
  if( (n = sscanf( lineptr, "%u.%u.%u.%u %u.%u.%u.%u %u",
      &g1, &g2, &g3, &g4, &i1, &i2, &i3, &i4 )) != 8 )
    {
      printf( "bad args\n" );
      break;
    }
  imr.imr_multiaddr.s_addr = (g1
     case 'l':
       {
  ++lineptr;
  while( *lineptr == ' ' || *lineptr == '\t' ) ++lineptr;
  if( (n = sscanf( lineptr, "%u.%u.%u.%u %u.%u.%u.%u %u",
      &g1, &g2, &g3, &g4, &i1, &i2, &i3, &i4 )) != 8 )
    {
      printf( "bad args\n" );
      break;
    }
  imr.imr_multiaddr.s_addr = (g1
     case 'a':
       {
  ++lineptr;
  while( *lineptr == ' ' || *lineptr == '\t' ) ++lineptr;
  if( (n = sscanf( lineptr, "%s %x.%x.%x.%x.%x.%x",
   ifr.ifr_name, &e1, &e2, &e3, &e4, &e5, &e6 )) != 7 )
    {
      printf( "bad args\n" );
      break;
    }
  ifr.ifr_addr.sa_family = AF_UNSPEC;
  ifr.ifr_addr.sa_data[0] = e1;
  ifr.ifr_addr.sa_data[1] = e2;
  ifr.ifr_addr.sa_data[2] = e3;
  ifr.ifr_addr.sa_data[3] = e4;
  ifr.ifr_addr.sa_data[4] = e5;
  ifr.ifr_addr.sa_data[5] = e6;
  if( ioctl( so, SIOCADDMULTI, &ifr ) == -1 )
       perror( "can't add ether adress" );
  else printf( "ether address added\n" );
  break;
       }     
     case 'd':
       {
  ++lineptr;
  while( *lineptr == ' ' || *lineptr == '\t' ) ++lineptr;
  if( (n = sscanf( lineptr, "%s %x.%x.%x.%x.%x.%x",
   ifr.ifr_name, &e1, &e2, &e3, &e4, &e5, &e6 )) != 7 )
    {
      printf( "bad args\n" );
      break;
    }
  ifr.ifr_addr.sa_family = AF_UNSPEC;
  ifr.ifr_addr.sa_data[0] = e1;
  ifr.ifr_addr.sa_data[1] = e2;
  ifr.ifr_addr.sa_data[2] = e3;
  ifr.ifr_addr.sa_data[3] = e4;
  ifr.ifr_addr.sa_data[4] = e5;
  ifr.ifr_addr.sa_data[5] = e6;
  if( ioctl( so, SIOCDELMULTI, &ifr ) == -1 )
       perror( "can't delete ether adress" );
  else printf( "ether address deleted\n" );
  break;
       }     
     case 'm':
       {
  ++lineptr;
  while( *lineptr == ' ' || *lineptr == '\t' ) ++lineptr;
  if( (n = sscanf( lineptr, "%s %u", ifr.ifr_name, &f )) != 2 )
    {
      printf( "bad args\n" );
      break;
    }
  if( ioctl( so, SIOCGIFFLAGS, &ifr ) == -1 )
    {
      perror( "can't get interface flags" );
      break;
    }
  printf( "interface flags %x, ", ifr.ifr_flags );
  fflush( stdout );
  if( f ) ifr.ifr_flags |=  IFF_ALLMULTI;
  else    ifr.ifr_flags &= ~IFF_ALLMULTI;
  if( ioctl( so, SIOCSIFFLAGS, &ifr ) == -1 )
       perror( "can't set" );
  else printf( "changed to %x\n", ifr.ifr_flags );
  break;
       }     
     case 'p':
       {
  ++lineptr;
  while( *lineptr == ' ' || *lineptr == '\t' ) ++lineptr;
  if( (n = sscanf( lineptr, "%s %u", ifr.ifr_name, &f )) != 2 )
    {
      printf( "bad args\n" );
      break;
    }
  if( ioctl( so, SIOCGIFFLAGS, &ifr ) == -1 )
    {
      perror( "can't get interface flags" );
      break;
    }
  printf( "interface flags %x, ", ifr.ifr_flags );
  fflush( stdout );
  if( f ) ifr.ifr_flags |=  IFF_PROMISC;
  else    ifr.ifr_flags &= ~IFF_PROMISC;
  if( ioctl( so, SIOCSIFFLAGS, &ifr ) == -1 )
       perror( "can't set" );
  else printf( "changed to %x\n", ifr.ifr_flags );
  break;
       }     
     case 'q': exit( 0 );
     case '/n': break;
     default:
       {
  printf( "bad command\n" );
  break;

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       }
   }
      }
  }

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