mirror of
https://github.com/nmap/nmap.git
synced 2025-12-15 12:19:02 +00:00
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.
libdnet ------- libdnet provides a simplified, portable interface to several low-level networking routines, including network address manipulation, kernel arp(4) cache and route(4) table lookup and manipulation, network firewalling, network interface lookup and manipulation, IP tunnelling, and raw IP packet and Ethernet frame transmission. WWW: http://libdnet.sourceforge.net/ $Id: README 578 2005-02-14 21:00:17Z dugsong $