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Nmap Exclude and Addrset
From: "Colin L. Rice" <dah4k0r () gmail com>
Date: Fri, 17 Jun 2011 15:19:16 -0500

Hello,

We recently decided to move the address set in ncat_hostmatch.c to
libnetutil in order to utilize its address set in Nmap. This has been
done.

As a consequence IPv6 excludes are now supported and this:
nmap -6 --exclude nmap.org/112 nmap.org scanme.nmap.org -d
goes from :

Starting Nmap 5.52.IPv6.Beta2 ( http://nmap.org ) at 2011-06-17 15:12
CDT
PORTS: Using top 1000 ports found open (TCP:1000, UDP:0, SCTP:0)
--------------- Timing report ---------------
  hostgroups: min 1, max 100000
  rtt-timeouts: init 1000, min 100, max 10000
  max-scan-delay: TCP 1000, UDP 1000, SCTP 1000
  parallelism: min 0, max 0
  max-retries: 10, host-timeout: 0
  min-rate: 0, max-rate: 0
---------------------------------------------
Invalid host expression: nmap.org/112 -- slash not allowed.  IPv6
addresses can currently only be specified individually
QUITTING!

To:

Starting Nmap 5.52.IPv6.Beta2 ( http://nmap.org ) at 2011-06-17 15:14
CDT
PORTS: Using top 1000 ports found open (TCP:1000, UDP:0, SCTP:0)
--------------- Timing report ---------------
  hostgroups: min 1, max 100000
  rtt-timeouts: init 1000, min 100, max 10000
  max-scan-delay: TCP 1000, UDP 1000, SCTP 1000
  parallelism: min 0, max 0
  max-retries: 10, host-timeout: 0
  min-rate: 0, max-rate: 0
---------------------------------------------
Initiating Ping Scan at 15:14
Scanning scanme.nmap.org (2600:3c01::f03c:91ff:fe93:cd19) [2 ports]
Completed Ping Scan at 15:14, 0.00s elapsed (1 total hosts)
Overall sending rates: 3853.56 packets / s.
Initiating System DNS resolution of 1 host. at 15:14
Completed System DNS resolution of 1 host. at 15:14, 0.00s elapsed
Nmap scan report for scanme.nmap.org (2600:3c01::f03c:91ff:fe93:cd19)
[host down, received net-unreach]
Read from /usr/local/bin/../share/nmap: nmap-payloads nmap-services.
Note: Host seems down. If it is really up, but blocking our ping probes,
try -Pn
Nmap done: 1 IP address (0 hosts up) scanned in 0.06 seconds

On a technical note there is another file in libnetutil addrset.c. An
addrset is a c linked list which holds a union of bitvectors and ipv6
addresses/masks. It works quite well in filtering out allowed versus
disallowed structures. Some of its functions are slightly changed from
the ncat_hostmatch in order to pass options in the functions and not use
o.blah which differs between programs. Everything has been updated
including the tests in ncat/test. There should be no difference in ncats
behavior. If you notice one give me a yell.

Cheers,
-Colin

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