/* * Program to test new [sg]etsockopts and ioctls for manipulating IP and * Ethernet multicast address filters. * * Written by Steve Deering, Stanford University, February 1989. */ #define MULTICAST #include <stdio.h> #include <sys/types.h> #include <sys/socket.h> #include <net/if.h> #include <sys/ioctl.h> #include <netinet/in.h> 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<<24) | (g2<<16) | (g3<<8) | g4; imr.imr_multiaddr.s_addr = htonl(imr.imr_multiaddr.s_addr); imr.imr_interface.s_addr = (i1<<24) | (i2<<16) | (i3<<8) | i4; imr.imr_interface.s_addr = htonl(imr.imr_interface.s_addr); if( setsockopt( so, IPPROTO_IP, IP_ADD_MEMBERSHIP, &imr, sizeof(struct ip_mreq) ) == -1 ) perror( "can't join group" ); else printf( "group joined\n" ); break; } 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<<24) | (g2<<16) | (g3<<8) | g4; imr.imr_multiaddr.s_addr = htonl(imr.imr_multiaddr.s_addr); imr.imr_interface.s_addr = (i1<<24) | (i2<<16) | (i3<<8) | i4; imr.imr_interface.s_addr = htonl(imr.imr_interface.s_addr); if( setsockopt( so, IPPROTO_IP, IP_DROP_MEMBERSHIP, &imr, sizeof(struct ip_mreq) ) == -1 ) perror( "can't leave group" ); else printf( "group left\n" ); break; } 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 0: case '\n': break; default: { printf( "bad command\n" ); break; } } } }