Sn00py.c is a quick and dirty packet sniffer for SGI IRIX. This latest release of the super lightweight packet sniffer incorporates a ‘depromiscuator’ function to avoid setting off the IFF_PROMISC flag.
You can download it from the following link: https://packetstormsecurity.com/files/download/14463/snoop2.c
Source: https://packetstormsecurity.com/files/14463/snoop2.c.html