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b5c1e83471
On OS X, the code in route_loop in route-bsd.c can get a gateway
sockaddr_dl that looks like this:
$1 = {
sdl_len = 20 '\024',
sdl_family = 18 '\022',
sdl_index = 4,
sdl_type = 6 '\006',
sdl_nlen = 0 '\0',
sdl_alen = 0 '\0',
sdl_slen = 0 '\0',
sdl_data = '\0' <repeats 11 times>
}
route_loop would throw these out because there's no hardward address
there. This is a routing table entry that indicates that there is no
gateway, and that packets for this particular destination need to go on
interface #4. It corresponds to this type of line from netstat output:
Destination Gateway Flags Refs Use Netif Expire
192.168.0 link#4 UCS 2 0 en0
I've changed it so that instead of throwing out the entry, it creates an
all-zero address of the same type as the destination address, which is a
convention used (by Nmap at least) to indicate an on-link route.