NS_PACKETSZ
unsigned char sig[NS_PACKETSZ];
#define PACKETSZ NS_PACKETSZ
u_char req[NS_PACKETSZ];
NULL, 0, NULL, req, NS_PACKETSZ);
(void) memset(buf, 0, NS_PACKETSZ);
bzero(rec_buf, NS_PACKETSZ);
if (recvfrom(s, rec_buf, NS_PACKETSZ, 0,
char buf[NS_PACKETSZ], buf2[NS_PACKETSZ];
char buf[NS_PACKETSZ], buf2[NS_PACKETSZ];
#define BUFLEN_UDP(x, y) (NS_PACKETSZ-(x-y))