Re: nmap IPv6 functionality partly broken on NetBSD

[David Fifield <david () bamsoftware com>]

On Sat, Mar 23, 2013 at 07:45:25PM +0100, Fredrik Pettai wrote:
> I haven't followed recent development, but noted that some changes has broken some nmap functionality then running on 
> NetBSD. All the problems I've found seems to be then running nmap as root.
>
> Here is one example:
>
> # nmap -v -A6 scanme.nmap.org
>
> Starting Nmap 6.01 ( http://nmap.org ) at 2013-03-23 19:19 CET
> NSE: Loaded 93 scripts for scanning.
> NSE: Script Pre-scanning.
> Target* nexthost(HostGroupState*, const addrset*, scan_lists*, int): failed to determine route to scanme.nmap.org 
> (2600:3c01::f03c:91ff:fe93:cd19)
> QUITTING!
>
> (same problem with the newest stable release…)

Thanks for this report. I think it is fixed in r30913.

What was going wrong was the alignment of rt_msghdr structures. On other
platforms the alignments is to either sizeof(unsigned long) or 4 bytes.
In NetBSD 6.1 (the version I tried), it is 8 bytes. Because the sa_len
of sockaddr_in6 is 28, not a multiple of 8, the routing table was being
read with incorrect alignment.

http://ftp.netbsd.org/pub/NetBSD/NetBSD-current/src/lib/libc/net/getifaddrs.c
http://fxr.watson.org/fxr/source/net/route.h?v=NETBSD#L270

We had to do something similar for NetBSD in r29739.

David Fifield
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