Example #1
0
int main(int argc, char **argv) {
    int r;

    assert(argc==7);

    endaddr(&us,argv,1);
    endaddr(&them,argv,4);

    static const uint8_t mprefix[]={
	0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x01,
	0x01, 0x01, 0x01, 0x01,
    };
    static const uint8_t msuffix[]={
	/* our nonce, fixed he he */
	0x8d, 0xf0, 0x3f, 0x35, 0xd6, 0xc8, 0x1f, 0xc0
    };
    int msglen= (sizeof(mprefix) +
		 2+strlen(us.name) +
		 2+strlen(them.name) +
		 sizeof(msuffix));
    uint8_t msg[msglen];
    uint8_t *msgp=msg;

#define PREFIXSUFFIX(prefixsuffix) do {			\
    memcpy(msgp,prefixsuffix,sizeof(prefixsuffix));	\
    msgp += sizeof(prefixsuffix);			\
  }while(0)

    PREFIXSUFFIX(mprefix);
    
    endname(&msgp,&us);
    endname(&msgp,&them);

    PREFIXSUFFIX(msuffix);

    assert(msgp == msg+msglen);

    struct protoent *proto=getprotobyname("udp");
    int fd=socket(AF_INET, SOCK_DGRAM, proto->p_proto);
    r=bind(fd,&us.sa,sizeof(us.sin)); if (r) { perror("bind us2"); exit(1); }

    for (;;) {
	r=sendto(fd,msg,msglen,0,&them.sa,sizeof(them.sin));
	if (r < 0) perror("sendto");

	r=getchar();
	if (r==EOF) {
	    if (ferror(stdin)) { perror("getchar"); exit(1); }
	    break;
	}
	if (r!='\n')
	    break;
    }
    exit(0);
}
Example #2
0
init_in()
{
	int p;

	for (p = endaddr(); p < KERNENTRY; p += sizeof (int)) {
		if (*(int *)p != ENTRY ||
		    *(int *)(p + sizeof (int)) != 0 ||
		    *(int *)(p + sizeof (int) * 2) != 0)
			continue;

		p += sizeof (int) * 3;
		if (bcmp((char *)p, magic, MAGICSIZE) == 0) {
			kern_len = *(int *)(p + MAGICSIZE);
			bcopy((char *)(p + MAGICSIZE + KERNLENSIZE),
				(char *)KERNENTRY, kern_len);
			break;
		}
	}
}
Example #3
0
void
init_in()
{
	int p;

	for (p = endaddr(); p < KERNENTRY; p += sizeof (int)) {
		if (*(int *)p != BEBOX_ENTRY ||
		    *(int *)(p + sizeof (int)) != 0 ||
		    *(int *)(p + sizeof (int) * 2) != 0)
			continue;

		p += sizeof (int) * 3;
		if (memcmp((char *)p, bebox_magic, BEBOX_MAGICSIZE) == 0) {
			kern_len = *(int *)(p + BEBOX_MAGICSIZE);
			memcpy((char *)KERNENTRY,
				(char *)(p + BEBOX_MAGICSIZE + KERNLENSIZE),
				kern_len);
			break;
		}
	}
}